WebGL 2.0 Specification - Khronos Group

2024-11-01

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When the getContext() method of a canvas element is to return a new object for the contextId webgl2 [CANVASCONTEXTS], the user agent must ... WebGL2.0Specification Editor'sDraftSatJan809:58:412022+0800 Thisversion: https://www.khronos.org/registry/webgl/specs/latest/2.0/ WebIDL:https://www.khronos.org/registry/webgl/specs/latest/2.0/webgl2.idl Latestversion: https://www.khronos.org/registry/webgl/specs/latest/2.0/ WebIDL:https://www.khronos.org/registry/webgl/specs/latest/2.0/webgl2.idl Previousversion: https://www.khronos.org/registry/webgl/specs/1.0.2/ WebIDL:https://www.khronos.org/registry/webgl/specs/1.0.2/webgl.idl Editors: DeanJackson (AppleInc.) JeffGilbert (MozillaCorp.) Copyright©2015KhronosGroup Abstract ThisisVersion2.0oftheWebGLSpecification. Thisspecificationdescribesanadditionalrenderingcontextandsupport objectsforthe HTML5canvaselement[CANVAS]. ThiscontextallowsrenderingusinganAPIthatconformscloselytotheOpenGLES3.0API. Thisdocumentshouldbereadasanextensiontothe WebGL1.0specification.Itwillonlydescribethedifferencesfrom1.0. Statusofthisdocument Thisdocumentisaneditor'sdraft.Donotcitethisdocumentasotherthanworkin progress. Feedback Publicdiscussionofthisspecificationiswelcomeon [email protected] (instructions,archives). Pleasefilebugsagainstthespecificationoritsconformancetestsin theissuetracker.Pullrequests arewelcomeagainsttheGithub repository. Tableofcontents Introduction WebGL™isanimmediatemode3DrenderingAPIdesignedfortheweb.ThisisVersion2ofthe WebGLspecification.ItisderivedfromOpenGL®ES3.0,andprovidessimilarrendering functionality,butinanHTMLcontext. WebGL2.0isnotentirelybackwardscompatiblewithWebGL1.0.Existingerror-freecontentwritten againstthecoreWebGL1.0specificationwithoutextensionswilloftenruninWebGL2.0without modification,butthisisnotalwaysthecase.Allexceptionstobackwardscompatibilityare recordedintheBackwardsIncompatibilitysection. Toaccessthenewbehaviorprovidedinthisspecification,thecontentexplicitlyrequests anewcontext(detailsbelow). Conventions ManyfunctionsdescribedinthisdocumentcontainlinkstoOpenGLES manpages.Whileeveryeffortismadetomakethesepagesmatchthe OpenGLES3.0specification[GLES30], theymaycontainerrors.Inthecaseofacontradiction,theOpenGL ES3.0specificationisthefinalauthority. Theremainingsectionsofthisdocumentareintendedtobereadinconjunction withtheOpenGLES3.0specification(3.0.6atthetimeofthiswriting,available fromtheKhronosOpenGLESAPIRegistry). Unlessotherwisespecified,thebehaviorofeachmethodisdefinedbythe OpenGLES3.0specification.ThisspecificationmaydivergefromOpenGLES3.0 inordertoensureinteroperabilityorsecurity,oftendefiningareasthat OpenGLES3.0leavesimplementation-defined.Thesedifferencesaresummarizedinthe DifferencesBetweenWebGLandOpenGLES3.0section. ContextCreationandDrawingBufferPresentation BeforeusingtheWebGLAPI,theauthormustobtainaWebGLRenderingContext objectforagivenHTMLCanvasElement[CANVAS]or OffscreenCanvas[OFFSCREENCANVAS]asdescribed below.ThisobjectisusedtomanageOpenGLstateandrendertothedrawingbuffer,which mustbecreatedatthetimeofcontextcreation. ContextCreation EachWebGLRenderingContextandWebGL2RenderingContexthasan associatedcanvas,setuponcreation,whichis acanvas[CANVAS]oroffscreen canvas[OFFSCREENCANVAS]. EachWebGLRenderingContextandWebGL2RenderingContexthascontext creationparameters,setuponcreation,in aWebGLContextAttributesobject. EachWebGLRenderingContextandWebGL2RenderingContexthasactual contextparameters,seteachtimethedrawingbufferiscreated,in aWebGLContextAttributesobject. EachWebGLRenderingContextandWebGL2RenderingContexthasawebgl contextlostflag,whichisinitiallyunset. WhenthegetContext()methodofacanvaselementistoreturna newobjectfor thecontextIdwebgl2[CANVASCONTEXTS], theuseragentmustperformthefollowingsteps: CreateanewWebGL2RenderingContextobject,context. Letcontext'scanvasbethecanvasoroffscreen canvasthegetContext()methodisassociatedwith. CreateanewWebGLContextAttributesobject,contextAttributes. IfgetContext()wasinvokedwithasecondargument,options,set theattributesofcontextAttributesfromthosespecifiedinoptions. Createadrawingbufferusingthesettings specifiedincontextAttributes,andassociatethedrawingbuffer withcontext. Ifdrawingbuffercreationfailed,performthefollowingsteps: FireaWebGLcontextcreation erroratcanvas. Returnnullandterminatethesesteps. CreateanewWebGLContextAttributesobject,actualAttributes. SettheattributesofactualAttributesbasedonthepropertiesofthenewly createddrawingbuffer. Setcontext'scontextcreation parameterstocontextAttributes. Setcontext'sactualcontext parameterstoactualAttributes. Returncontext. TheDrawingBuffer DifferentfromWebGL1.0,thedepth,stencil,and antialiasattributesinWebGL2.0mustbeobeyedbytheWebGL implementation. DOMInterfaces Thissectiondescribestheinterfacesandfunctionalityaddedtothe DOMtosupportruntimeaccesstothefunctionalitydescribedabove. Types ThefollowingtypesareintroducedinWebGL2.0. typedeflonglongGLint64; typedefunsignedlonglongGLuint64; WebGLQuery TheWebGLQueryinterfacerepresentsanOpenGLQueryObject. TheunderlyingobjectiscreatedasifbycallingglGenQueries (OpenGLES3.0.6§2.14, manpage) , madeactiveasifbycallingglBeginQuery (OpenGLES3.0.6§2.14, manpage) , concludedasifbycallingglEndQuery (OpenGLES3.0.6§2.14, manpage) anddestroyedasifbycallingglDeleteQueries (OpenGLES3.0.6§2.14, manpage) . [Exposed=(Window,Worker)] interfaceWebGLQuery:WebGLObject{ }; WebGLSampler TheWebGLSamplerinterfacerepresentsanOpenGLSamplerObject. TheunderlyingobjectiscreatedasifbycallingglGenSamplers (OpenGLES3.0.6§3.8.2, manpage) , boundasifbycallingglBindSampler (OpenGLES3.0.6§3.8.2, manpage) anddestroyedasifbycallingglDeleteSamplers (OpenGLES3.0.6§3.8.2, manpage) . [Exposed=(Window,Worker)] interfaceWebGLSampler:WebGLObject{ }; WebGLSync TheWebGLSyncinterfacerepresentsanOpenGLSyncObject. TheunderlyingobjectiscreatedasifbycallingglFenceSync (OpenGLES3.0.6§5.2, manpage) , blockedonasifbycallingglClientWaitSync (OpenGLES3.0.6§5.2.1, manpage) , waitedoninternaltoGLasifbycallingglWaitSync (OpenGLES3.0.6§5.2.1, manpage) , queriedasifbycallingglGetSynciv (OpenGLES3.0.6§6.1.8, manpage) , anddestroyedasifbycallingglDeleteSync (OpenGLES3.0.6§5.2, manpage) . [Exposed=(Window,Worker)] interfaceWebGLSync:WebGLObject{ }; WebGLTransformFeedback TheWebGLTransformFeedbackinterfacerepresentsanOpenGLTransformFeedbackObject. TheunderlyingobjectiscreatedasifbycallingglGenTransformFeedbacks (OpenGLES3.0.6§2.15.1, manpage) , boundasifbycallingglBindTransformFeedback (OpenGLES3.0.6§2.15.1, manpage) anddestroyedasifbycallingglDeleteTransformFeedbacks (OpenGLES3.0.6§2.15.1, manpage) . [Exposed=(Window,Worker)] interfaceWebGLTransformFeedback:WebGLObject{ }; WebGLVertexArrayObject TheWebGLVertexArrayObjectinterfacerepresentsanOpenGLVertexArrayObject. TheunderlyingobjectiscreatedasifbycallingglGenVertexArrays (OpenGLES3.0.6§2.10, manpage) , boundasifbycallingglBindVertexArray (OpenGLES3.0.6§2.10, manpage) anddestroyedasifbycallingglDeleteVertexArrays (OpenGLES3.0.6§2.10, manpage) . [Exposed=(Window,Worker)] interfaceWebGLVertexArrayObject:WebGLObject{ }; TheWebGLcontext TheWebGL2RenderingContextrepresentstheAPIallowing OpenGLES3.0stylerenderingintothecanvaselement. typedef([AllowShared]Uint32Arrayorsequence)Uint32List; interfacemixinWebGL2RenderingContextBase { constGLenumREAD_BUFFER=0x0C02; constGLenumUNPACK_ROW_LENGTH=0x0CF2; constGLenumUNPACK_SKIP_ROWS=0x0CF3; constGLenumUNPACK_SKIP_PIXELS=0x0CF4; constGLenumPACK_ROW_LENGTH=0x0D02; constGLenumPACK_SKIP_ROWS=0x0D03; constGLenumPACK_SKIP_PIXELS=0x0D04; constGLenumCOLOR=0x1800; constGLenumDEPTH=0x1801; constGLenumSTENCIL=0x1802; constGLenumRED=0x1903; constGLenumRGB8=0x8051; constGLenumRGBA8=0x8058; constGLenumRGB10_A2=0x8059; constGLenumTEXTURE_BINDING_3D=0x806A; constGLenumUNPACK_SKIP_IMAGES=0x806D; constGLenumUNPACK_IMAGE_HEIGHT=0x806E; constGLenumTEXTURE_3D=0x806F; constGLenumTEXTURE_WRAP_R=0x8072; constGLenumMAX_3D_TEXTURE_SIZE=0x8073; constGLenumUNSIGNED_INT_2_10_10_10_REV=0x8368; constGLenumMAX_ELEMENTS_VERTICES=0x80E8; constGLenumMAX_ELEMENTS_INDICES=0x80E9; constGLenumTEXTURE_MIN_LOD=0x813A; constGLenumTEXTURE_MAX_LOD=0x813B; constGLenumTEXTURE_BASE_LEVEL=0x813C; constGLenumTEXTURE_MAX_LEVEL=0x813D; constGLenumMIN=0x8007; constGLenumMAX=0x8008; constGLenumDEPTH_COMPONENT24=0x81A6; constGLenumMAX_TEXTURE_LOD_BIAS=0x84FD; constGLenumTEXTURE_COMPARE_MODE=0x884C; constGLenumTEXTURE_COMPARE_FUNC=0x884D; constGLenumCURRENT_QUERY=0x8865; constGLenumQUERY_RESULT=0x8866; constGLenumQUERY_RESULT_AVAILABLE=0x8867; constGLenumSTREAM_READ=0x88E1; constGLenumSTREAM_COPY=0x88E2; constGLenumSTATIC_READ=0x88E5; constGLenumSTATIC_COPY=0x88E6; constGLenumDYNAMIC_READ=0x88E9; constGLenumDYNAMIC_COPY=0x88EA; constGLenumMAX_DRAW_BUFFERS=0x8824; constGLenumDRAW_BUFFER0=0x8825; constGLenumDRAW_BUFFER1=0x8826; constGLenumDRAW_BUFFER2=0x8827; constGLenumDRAW_BUFFER3=0x8828; constGLenumDRAW_BUFFER4=0x8829; constGLenumDRAW_BUFFER5=0x882A; constGLenumDRAW_BUFFER6=0x882B; constGLenumDRAW_BUFFER7=0x882C; constGLenumDRAW_BUFFER8=0x882D; constGLenumDRAW_BUFFER9=0x882E; constGLenumDRAW_BUFFER10=0x882F; constGLenumDRAW_BUFFER11=0x8830; constGLenumDRAW_BUFFER12=0x8831; constGLenumDRAW_BUFFER13=0x8832; constGLenumDRAW_BUFFER14=0x8833; constGLenumDRAW_BUFFER15=0x8834; constGLenumMAX_FRAGMENT_UNIFORM_COMPONENTS=0x8B49; constGLenumMAX_VERTEX_UNIFORM_COMPONENTS=0x8B4A; constGLenumSAMPLER_3D=0x8B5F; constGLenumSAMPLER_2D_SHADOW=0x8B62; constGLenumFRAGMENT_SHADER_DERIVATIVE_HINT=0x8B8B; constGLenumPIXEL_PACK_BUFFER=0x88EB; constGLenumPIXEL_UNPACK_BUFFER=0x88EC; constGLenumPIXEL_PACK_BUFFER_BINDING=0x88ED; constGLenumPIXEL_UNPACK_BUFFER_BINDING=0x88EF; constGLenumFLOAT_MAT2x3=0x8B65; constGLenumFLOAT_MAT2x4=0x8B66; constGLenumFLOAT_MAT3x2=0x8B67; constGLenumFLOAT_MAT3x4=0x8B68; constGLenumFLOAT_MAT4x2=0x8B69; constGLenumFLOAT_MAT4x3=0x8B6A; constGLenumSRGB=0x8C40; constGLenumSRGB8=0x8C41; constGLenumSRGB8_ALPHA8=0x8C43; constGLenumCOMPARE_REF_TO_TEXTURE=0x884E; constGLenumRGBA32F=0x8814; constGLenumRGB32F=0x8815; constGLenumRGBA16F=0x881A; constGLenumRGB16F=0x881B; constGLenumVERTEX_ATTRIB_ARRAY_INTEGER=0x88FD; constGLenumMAX_ARRAY_TEXTURE_LAYERS=0x88FF; constGLenumMIN_PROGRAM_TEXEL_OFFSET=0x8904; constGLenumMAX_PROGRAM_TEXEL_OFFSET=0x8905; constGLenumMAX_VARYING_COMPONENTS=0x8B4B; constGLenumTEXTURE_2D_ARRAY=0x8C1A; constGLenumTEXTURE_BINDING_2D_ARRAY=0x8C1D; constGLenumR11F_G11F_B10F=0x8C3A; constGLenumUNSIGNED_INT_10F_11F_11F_REV=0x8C3B; constGLenumRGB9_E5=0x8C3D; constGLenumUNSIGNED_INT_5_9_9_9_REV=0x8C3E; constGLenumTRANSFORM_FEEDBACK_BUFFER_MODE=0x8C7F; constGLenumMAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTS=0x8C80; constGLenumTRANSFORM_FEEDBACK_VARYINGS=0x8C83; constGLenumTRANSFORM_FEEDBACK_BUFFER_START=0x8C84; constGLenumTRANSFORM_FEEDBACK_BUFFER_SIZE=0x8C85; constGLenumTRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN=0x8C88; constGLenumRASTERIZER_DISCARD=0x8C89; constGLenumMAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS=0x8C8A; constGLenumMAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS=0x8C8B; constGLenumINTERLEAVED_ATTRIBS=0x8C8C; constGLenumSEPARATE_ATTRIBS=0x8C8D; constGLenumTRANSFORM_FEEDBACK_BUFFER=0x8C8E; constGLenumTRANSFORM_FEEDBACK_BUFFER_BINDING=0x8C8F; constGLenumRGBA32UI=0x8D70; constGLenumRGB32UI=0x8D71; constGLenumRGBA16UI=0x8D76; constGLenumRGB16UI=0x8D77; constGLenumRGBA8UI=0x8D7C; constGLenumRGB8UI=0x8D7D; constGLenumRGBA32I=0x8D82; constGLenumRGB32I=0x8D83; constGLenumRGBA16I=0x8D88; constGLenumRGB16I=0x8D89; constGLenumRGBA8I=0x8D8E; constGLenumRGB8I=0x8D8F; constGLenumRED_INTEGER=0x8D94; constGLenumRGB_INTEGER=0x8D98; constGLenumRGBA_INTEGER=0x8D99; constGLenumSAMPLER_2D_ARRAY=0x8DC1; constGLenumSAMPLER_2D_ARRAY_SHADOW=0x8DC4; constGLenumSAMPLER_CUBE_SHADOW=0x8DC5; constGLenumUNSIGNED_INT_VEC2=0x8DC6; constGLenumUNSIGNED_INT_VEC3=0x8DC7; constGLenumUNSIGNED_INT_VEC4=0x8DC8; constGLenumINT_SAMPLER_2D=0x8DCA; constGLenumINT_SAMPLER_3D=0x8DCB; constGLenumINT_SAMPLER_CUBE=0x8DCC; constGLenumINT_SAMPLER_2D_ARRAY=0x8DCF; constGLenumUNSIGNED_INT_SAMPLER_2D=0x8DD2; constGLenumUNSIGNED_INT_SAMPLER_3D=0x8DD3; constGLenumUNSIGNED_INT_SAMPLER_CUBE=0x8DD4; constGLenumUNSIGNED_INT_SAMPLER_2D_ARRAY=0x8DD7; constGLenumDEPTH_COMPONENT32F=0x8CAC; constGLenumDEPTH32F_STENCIL8=0x8CAD; constGLenumFLOAT_32_UNSIGNED_INT_24_8_REV=0x8DAD; constGLenumFRAMEBUFFER_ATTACHMENT_COLOR_ENCODING=0x8210; constGLenumFRAMEBUFFER_ATTACHMENT_COMPONENT_TYPE=0x8211; constGLenumFRAMEBUFFER_ATTACHMENT_RED_SIZE=0x8212; constGLenumFRAMEBUFFER_ATTACHMENT_GREEN_SIZE=0x8213; constGLenumFRAMEBUFFER_ATTACHMENT_BLUE_SIZE=0x8214; constGLenumFRAMEBUFFER_ATTACHMENT_ALPHA_SIZE=0x8215; constGLenumFRAMEBUFFER_ATTACHMENT_DEPTH_SIZE=0x8216; constGLenumFRAMEBUFFER_ATTACHMENT_STENCIL_SIZE=0x8217; constGLenumFRAMEBUFFER_DEFAULT=0x8218; constGLenumUNSIGNED_INT_24_8=0x84FA; constGLenumDEPTH24_STENCIL8=0x88F0; constGLenumUNSIGNED_NORMALIZED=0x8C17; constGLenumDRAW_FRAMEBUFFER_BINDING=0x8CA6;/*SameasFRAMEBUFFER_BINDING*/ constGLenumREAD_FRAMEBUFFER=0x8CA8; constGLenumDRAW_FRAMEBUFFER=0x8CA9; constGLenumREAD_FRAMEBUFFER_BINDING=0x8CAA; constGLenumRENDERBUFFER_SAMPLES=0x8CAB; constGLenumFRAMEBUFFER_ATTACHMENT_TEXTURE_LAYER=0x8CD4; constGLenumMAX_COLOR_ATTACHMENTS=0x8CDF; constGLenumCOLOR_ATTACHMENT1=0x8CE1; constGLenumCOLOR_ATTACHMENT2=0x8CE2; constGLenumCOLOR_ATTACHMENT3=0x8CE3; constGLenumCOLOR_ATTACHMENT4=0x8CE4; constGLenumCOLOR_ATTACHMENT5=0x8CE5; constGLenumCOLOR_ATTACHMENT6=0x8CE6; constGLenumCOLOR_ATTACHMENT7=0x8CE7; constGLenumCOLOR_ATTACHMENT8=0x8CE8; constGLenumCOLOR_ATTACHMENT9=0x8CE9; constGLenumCOLOR_ATTACHMENT10=0x8CEA; constGLenumCOLOR_ATTACHMENT11=0x8CEB; constGLenumCOLOR_ATTACHMENT12=0x8CEC; constGLenumCOLOR_ATTACHMENT13=0x8CED; constGLenumCOLOR_ATTACHMENT14=0x8CEE; constGLenumCOLOR_ATTACHMENT15=0x8CEF; constGLenumFRAMEBUFFER_INCOMPLETE_MULTISAMPLE=0x8D56; constGLenumMAX_SAMPLES=0x8D57; constGLenumHALF_FLOAT=0x140B; constGLenumRG=0x8227; constGLenumRG_INTEGER=0x8228; constGLenumR8=0x8229; constGLenumRG8=0x822B; constGLenumR16F=0x822D; constGLenumR32F=0x822E; constGLenumRG16F=0x822F; constGLenumRG32F=0x8230; constGLenumR8I=0x8231; constGLenumR8UI=0x8232; constGLenumR16I=0x8233; constGLenumR16UI=0x8234; constGLenumR32I=0x8235; constGLenumR32UI=0x8236; constGLenumRG8I=0x8237; constGLenumRG8UI=0x8238; constGLenumRG16I=0x8239; constGLenumRG16UI=0x823A; constGLenumRG32I=0x823B; constGLenumRG32UI=0x823C; constGLenumVERTEX_ARRAY_BINDING=0x85B5; constGLenumR8_SNORM=0x8F94; constGLenumRG8_SNORM=0x8F95; constGLenumRGB8_SNORM=0x8F96; constGLenumRGBA8_SNORM=0x8F97; constGLenumSIGNED_NORMALIZED=0x8F9C; constGLenumCOPY_READ_BUFFER=0x8F36; constGLenumCOPY_WRITE_BUFFER=0x8F37; constGLenumCOPY_READ_BUFFER_BINDING=0x8F36;/*SameasCOPY_READ_BUFFER*/ constGLenumCOPY_WRITE_BUFFER_BINDING=0x8F37;/*SameasCOPY_WRITE_BUFFER*/ constGLenumUNIFORM_BUFFER=0x8A11; constGLenumUNIFORM_BUFFER_BINDING=0x8A28; constGLenumUNIFORM_BUFFER_START=0x8A29; constGLenumUNIFORM_BUFFER_SIZE=0x8A2A; constGLenumMAX_VERTEX_UNIFORM_BLOCKS=0x8A2B; constGLenumMAX_FRAGMENT_UNIFORM_BLOCKS=0x8A2D; constGLenumMAX_COMBINED_UNIFORM_BLOCKS=0x8A2E; constGLenumMAX_UNIFORM_BUFFER_BINDINGS=0x8A2F; constGLenumMAX_UNIFORM_BLOCK_SIZE=0x8A30; constGLenumMAX_COMBINED_VERTEX_UNIFORM_COMPONENTS=0x8A31; constGLenumMAX_COMBINED_FRAGMENT_UNIFORM_COMPONENTS=0x8A33; constGLenumUNIFORM_BUFFER_OFFSET_ALIGNMENT=0x8A34; constGLenumACTIVE_UNIFORM_BLOCKS=0x8A36; constGLenumUNIFORM_TYPE=0x8A37; constGLenumUNIFORM_SIZE=0x8A38; constGLenumUNIFORM_BLOCK_INDEX=0x8A3A; constGLenumUNIFORM_OFFSET=0x8A3B; constGLenumUNIFORM_ARRAY_STRIDE=0x8A3C; constGLenumUNIFORM_MATRIX_STRIDE=0x8A3D; constGLenumUNIFORM_IS_ROW_MAJOR=0x8A3E; constGLenumUNIFORM_BLOCK_BINDING=0x8A3F; constGLenumUNIFORM_BLOCK_DATA_SIZE=0x8A40; constGLenumUNIFORM_BLOCK_ACTIVE_UNIFORMS=0x8A42; constGLenumUNIFORM_BLOCK_ACTIVE_UNIFORM_INDICES=0x8A43; constGLenumUNIFORM_BLOCK_REFERENCED_BY_VERTEX_SHADER=0x8A44; constGLenumUNIFORM_BLOCK_REFERENCED_BY_FRAGMENT_SHADER=0x8A46; constGLenumINVALID_INDEX=0xFFFFFFFF; constGLenumMAX_VERTEX_OUTPUT_COMPONENTS=0x9122; constGLenumMAX_FRAGMENT_INPUT_COMPONENTS=0x9125; constGLenumMAX_SERVER_WAIT_TIMEOUT=0x9111; constGLenumOBJECT_TYPE=0x9112; constGLenumSYNC_CONDITION=0x9113; constGLenumSYNC_STATUS=0x9114; constGLenumSYNC_FLAGS=0x9115; constGLenumSYNC_FENCE=0x9116; constGLenumSYNC_GPU_COMMANDS_COMPLETE=0x9117; constGLenumUNSIGNALED=0x9118; constGLenumSIGNALED=0x9119; constGLenumALREADY_SIGNALED=0x911A; constGLenumTIMEOUT_EXPIRED=0x911B; constGLenumCONDITION_SATISFIED=0x911C; constGLenumWAIT_FAILED=0x911D; constGLenumSYNC_FLUSH_COMMANDS_BIT=0x00000001; constGLenumVERTEX_ATTRIB_ARRAY_DIVISOR=0x88FE; constGLenumANY_SAMPLES_PASSED=0x8C2F; constGLenumANY_SAMPLES_PASSED_CONSERVATIVE=0x8D6A; constGLenumSAMPLER_BINDING=0x8919; constGLenumRGB10_A2UI=0x906F; constGLenumINT_2_10_10_10_REV=0x8D9F; constGLenumTRANSFORM_FEEDBACK=0x8E22; constGLenumTRANSFORM_FEEDBACK_PAUSED=0x8E23; constGLenumTRANSFORM_FEEDBACK_ACTIVE=0x8E24; constGLenumTRANSFORM_FEEDBACK_BINDING=0x8E25; constGLenumTEXTURE_IMMUTABLE_FORMAT=0x912F; constGLenumMAX_ELEMENT_INDEX=0x8D6B; constGLenumTEXTURE_IMMUTABLE_LEVELS=0x82DF; constGLint64TIMEOUT_IGNORED=-1; /*WebGL-specificenums*/ constGLenumMAX_CLIENT_WAIT_TIMEOUT_WEBGL=0x9247; /*Bufferobjects*/ undefinedcopyBufferSubData(GLenumreadTarget,GLenumwriteTarget,GLintptrreadOffset, GLintptrwriteOffset,GLsizeiptrsize); //MapBufferRange,inparticularitsread-onlyandwrite-onlymodes, //cannotbeexposedsafelytoJavaScript.GetBufferSubData //replacesitforthepurposeoffetchingdatabackfromtheGPU. undefinedgetBufferSubData(GLenumtarget,GLintptrsrcByteOffset,[AllowShared]ArrayBufferViewdstBuffer, optionalGLuintdstOffset=0,optionalGLuintlength=0); /*Framebufferobjects*/ undefinedblitFramebuffer(GLintsrcX0,GLintsrcY0,GLintsrcX1,GLintsrcY1,GLintdstX0,GLintdstY0, GLintdstX1,GLintdstY1,GLbitfieldmask,GLenumfilter); undefinedframebufferTextureLayer(GLenumtarget,GLenumattachment,WebGLTexture?texture,GLintlevel, GLintlayer); undefinedinvalidateFramebuffer(GLenumtarget,sequenceattachments); undefinedinvalidateSubFramebuffer(GLenumtarget,sequenceattachments, GLintx,GLinty,GLsizeiwidth,GLsizeiheight); undefinedreadBuffer(GLenumsrc); /*Renderbufferobjects*/ anygetInternalformatParameter(GLenumtarget,GLenuminternalformat,GLenumpname); undefinedrenderbufferStorageMultisample(GLenumtarget,GLsizeisamples,GLenuminternalformat, GLsizeiwidth,GLsizeiheight); /*Textureobjects*/ undefinedtexStorage2D(GLenumtarget,GLsizeilevels,GLenuminternalformat,GLsizeiwidth, GLsizeiheight); undefinedtexStorage3D(GLenumtarget,GLsizeilevels,GLenuminternalformat,GLsizeiwidth, GLsizeiheight,GLsizeidepth); undefinedtexImage3D(GLenumtarget,GLintlevel,GLintinternalformat,GLsizeiwidth,GLsizeiheight, GLsizeidepth,GLintborder,GLenumformat,GLenumtype,GLintptrpboOffset); undefinedtexImage3D(GLenumtarget,GLintlevel,GLintinternalformat,GLsizeiwidth,GLsizeiheight, GLsizeidepth,GLintborder,GLenumformat,GLenumtype, TexImageSourcesource);//MaythrowDOMException undefinedtexImage3D(GLenumtarget,GLintlevel,GLintinternalformat,GLsizeiwidth,GLsizeiheight, GLsizeidepth,GLintborder,GLenumformat,GLenumtype,[AllowShared]ArrayBufferView?srcData); undefinedtexImage3D(GLenumtarget,GLintlevel,GLintinternalformat,GLsizeiwidth,GLsizeiheight, GLsizeidepth,GLintborder,GLenumformat,GLenumtype,[AllowShared]ArrayBufferViewsrcData, GLuintsrcOffset); undefinedtexSubImage3D(GLenumtarget,GLintlevel,GLintxoffset,GLintyoffset,GLintzoffset, GLsizeiwidth,GLsizeiheight,GLsizeidepth,GLenumformat,GLenumtype, GLintptrpboOffset); undefinedtexSubImage3D(GLenumtarget,GLintlevel,GLintxoffset,GLintyoffset,GLintzoffset, GLsizeiwidth,GLsizeiheight,GLsizeidepth,GLenumformat,GLenumtype, TexImageSourcesource);//MaythrowDOMException undefinedtexSubImage3D(GLenumtarget,GLintlevel,GLintxoffset,GLintyoffset,GLintzoffset, GLsizeiwidth,GLsizeiheight,GLsizeidepth,GLenumformat,GLenumtype, [AllowShared]ArrayBufferView?srcData,optionalGLuintsrcOffset=0); undefinedcopyTexSubImage3D(GLenumtarget,GLintlevel,GLintxoffset,GLintyoffset,GLintzoffset, GLintx,GLinty,GLsizeiwidth,GLsizeiheight); undefinedcompressedTexImage3D(GLenumtarget,GLintlevel,GLenuminternalformat,GLsizeiwidth, GLsizeiheight,GLsizeidepth,GLintborder,GLsizeiimageSize,GLintptroffset); undefinedcompressedTexImage3D(GLenumtarget,GLintlevel,GLenuminternalformat,GLsizeiwidth, GLsizeiheight,GLsizeidepth,GLintborder,[AllowShared]ArrayBufferViewsrcData, optionalGLuintsrcOffset=0,optionalGLuintsrcLengthOverride=0); undefinedcompressedTexSubImage3D(GLenumtarget,GLintlevel,GLintxoffset,GLintyoffset, GLintzoffset,GLsizeiwidth,GLsizeiheight,GLsizeidepth, GLenumformat,GLsizeiimageSize,GLintptroffset); undefinedcompressedTexSubImage3D(GLenumtarget,GLintlevel,GLintxoffset,GLintyoffset, GLintzoffset,GLsizeiwidth,GLsizeiheight,GLsizeidepth, GLenumformat,[AllowShared]ArrayBufferViewsrcData, optionalGLuintsrcOffset=0, optionalGLuintsrcLengthOverride=0); /*Programsandshaders*/ [WebGLHandlesContextLoss]GLintgetFragDataLocation(WebGLProgramprogram,DOMStringname); /*Uniforms*/ undefineduniform1ui(WebGLUniformLocation?location,GLuintv0); undefineduniform2ui(WebGLUniformLocation?location,GLuintv0,GLuintv1); undefineduniform3ui(WebGLUniformLocation?location,GLuintv0,GLuintv1,GLuintv2); undefineduniform4ui(WebGLUniformLocation?location,GLuintv0,GLuintv1,GLuintv2,GLuintv3); undefineduniform1uiv(WebGLUniformLocation?location,Uint32Listdata,optionalGLuintsrcOffset=0, optionalGLuintsrcLength=0); undefineduniform2uiv(WebGLUniformLocation?location,Uint32Listdata,optionalGLuintsrcOffset=0, optionalGLuintsrcLength=0); undefineduniform3uiv(WebGLUniformLocation?location,Uint32Listdata,optionalGLuintsrcOffset=0, optionalGLuintsrcLength=0); undefineduniform4uiv(WebGLUniformLocation?location,Uint32Listdata,optionalGLuintsrcOffset=0, optionalGLuintsrcLength=0); undefineduniformMatrix3x2fv(WebGLUniformLocation?location,GLbooleantranspose,Float32Listdata, optionalGLuintsrcOffset=0,optionalGLuintsrcLength=0); undefineduniformMatrix4x2fv(WebGLUniformLocation?location,GLbooleantranspose,Float32Listdata, optionalGLuintsrcOffset=0,optionalGLuintsrcLength=0); undefineduniformMatrix2x3fv(WebGLUniformLocation?location,GLbooleantranspose,Float32Listdata, optionalGLuintsrcOffset=0,optionalGLuintsrcLength=0); undefineduniformMatrix4x3fv(WebGLUniformLocation?location,GLbooleantranspose,Float32Listdata, optionalGLuintsrcOffset=0,optionalGLuintsrcLength=0); undefineduniformMatrix2x4fv(WebGLUniformLocation?location,GLbooleantranspose,Float32Listdata, optionalGLuintsrcOffset=0,optionalGLuintsrcLength=0); undefineduniformMatrix3x4fv(WebGLUniformLocation?location,GLbooleantranspose,Float32Listdata, optionalGLuintsrcOffset=0,optionalGLuintsrcLength=0); /*Vertexattribs*/ undefinedvertexAttribI4i(GLuintindex,GLintx,GLinty,GLintz,GLintw); undefinedvertexAttribI4iv(GLuintindex,Int32Listvalues); undefinedvertexAttribI4ui(GLuintindex,GLuintx,GLuinty,GLuintz,GLuintw); undefinedvertexAttribI4uiv(GLuintindex,Uint32Listvalues); undefinedvertexAttribIPointer(GLuintindex,GLintsize,GLenumtype,GLsizeistride,GLintptroffset); /*Writingtothedrawingbuffer*/ undefinedvertexAttribDivisor(GLuintindex,GLuintdivisor); undefineddrawArraysInstanced(GLenummode,GLintfirst,GLsizeicount,GLsizeiinstanceCount); undefineddrawElementsInstanced(GLenummode,GLsizeicount,GLenumtype,GLintptroffset,GLsizeiinstanceCount); undefineddrawRangeElements(GLenummode,GLuintstart,GLuintend,GLsizeicount,GLenumtype,GLintptroffset); /*MultipleRenderTargets*/ undefineddrawBuffers(sequencebuffers); undefinedclearBufferfv(GLenumbuffer,GLintdrawbuffer,Float32Listvalues, optionalGLuintsrcOffset=0); undefinedclearBufferiv(GLenumbuffer,GLintdrawbuffer,Int32Listvalues, optionalGLuintsrcOffset=0); undefinedclearBufferuiv(GLenumbuffer,GLintdrawbuffer,Uint32Listvalues, optionalGLuintsrcOffset=0); undefinedclearBufferfi(GLenumbuffer,GLintdrawbuffer,GLfloatdepth,GLintstencil); /*QueryObjects*/ WebGLQuery?createQuery(); undefineddeleteQuery(WebGLQuery?query); [WebGLHandlesContextLoss]GLbooleanisQuery(WebGLQuery?query); undefinedbeginQuery(GLenumtarget,WebGLQueryquery); undefinedendQuery(GLenumtarget); WebGLQuery?getQuery(GLenumtarget,GLenumpname); anygetQueryParameter(WebGLQueryquery,GLenumpname); /*SamplerObjects*/ WebGLSampler?createSampler(); undefineddeleteSampler(WebGLSampler?sampler); [WebGLHandlesContextLoss]GLbooleanisSampler(WebGLSampler?sampler); undefinedbindSampler(GLuintunit,WebGLSampler?sampler); undefinedsamplerParameteri(WebGLSamplersampler,GLenumpname,GLintparam); undefinedsamplerParameterf(WebGLSamplersampler,GLenumpname,GLfloatparam); anygetSamplerParameter(WebGLSamplersampler,GLenumpname); /*Syncobjects*/ WebGLSync?fenceSync(GLenumcondition,GLbitfieldflags); [WebGLHandlesContextLoss]GLbooleanisSync(WebGLSync?sync); undefineddeleteSync(WebGLSync?sync); GLenumclientWaitSync(WebGLSyncsync,GLbitfieldflags,GLuint64timeout); undefinedwaitSync(WebGLSyncsync,GLbitfieldflags,GLint64timeout); anygetSyncParameter(WebGLSyncsync,GLenumpname); /*TransformFeedback*/ WebGLTransformFeedback?createTransformFeedback(); undefineddeleteTransformFeedback(WebGLTransformFeedback?tf); [WebGLHandlesContextLoss]GLbooleanisTransformFeedback(WebGLTransformFeedback?tf); undefinedbindTransformFeedback(GLenumtarget,WebGLTransformFeedback?tf); undefinedbeginTransformFeedback(GLenumprimitiveMode); undefinedendTransformFeedback(); undefinedtransformFeedbackVaryings(WebGLProgramprogram,sequencevaryings,GLenumbufferMode); WebGLActiveInfo?getTransformFeedbackVarying(WebGLProgramprogram,GLuintindex); undefinedpauseTransformFeedback(); undefinedresumeTransformFeedback(); /*UniformBufferObjectsandTransformFeedbackBuffers*/ undefinedbindBufferBase(GLenumtarget,GLuintindex,WebGLBuffer?buffer); undefinedbindBufferRange(GLenumtarget,GLuintindex,WebGLBuffer?buffer,GLintptroffset,GLsizeiptrsize); anygetIndexedParameter(GLenumtarget,GLuintindex); sequence?getUniformIndices(WebGLProgramprogram,sequenceuniformNames); anygetActiveUniforms(WebGLProgramprogram,sequenceuniformIndices,GLenumpname); GLuintgetUniformBlockIndex(WebGLProgramprogram,DOMStringuniformBlockName); anygetActiveUniformBlockParameter(WebGLProgramprogram,GLuintuniformBlockIndex,GLenumpname); DOMString?getActiveUniformBlockName(WebGLProgramprogram,GLuintuniformBlockIndex); undefineduniformBlockBinding(WebGLProgramprogram,GLuintuniformBlockIndex,GLuintuniformBlockBinding); /*VertexArrayObjects*/ WebGLVertexArrayObject?createVertexArray(); undefineddeleteVertexArray(WebGLVertexArrayObject?vertexArray); [WebGLHandlesContextLoss]GLbooleanisVertexArray(WebGLVertexArrayObject?vertexArray); undefinedbindVertexArray(WebGLVertexArrayObject?array); }; interfacemixinWebGL2RenderingContextOverloads { //WebGL1: undefinedbufferData(GLenumtarget,GLsizeiptrsize,GLenumusage); undefinedbufferData(GLenumtarget,[AllowShared]BufferSource?srcData,GLenumusage); undefinedbufferSubData(GLenumtarget,GLintptrdstByteOffset,[AllowShared]BufferSourcesrcData); //WebGL2: undefinedbufferData(GLenumtarget,[AllowShared]ArrayBufferViewsrcData,GLenumusage,GLuintsrcOffset, optionalGLuintlength=0); undefinedbufferSubData(GLenumtarget,GLintptrdstByteOffset,[AllowShared]ArrayBufferViewsrcData, GLuintsrcOffset,optionalGLuintlength=0); //WebGL1legacyentrypoints: undefinedtexImage2D(GLenumtarget,GLintlevel,GLintinternalformat, GLsizeiwidth,GLsizeiheight,GLintborder,GLenumformat, GLenumtype,[AllowShared]ArrayBufferView?pixels); undefinedtexImage2D(GLenumtarget,GLintlevel,GLintinternalformat, GLenumformat,GLenumtype,TexImageSourcesource);//MaythrowDOMException undefinedtexSubImage2D(GLenumtarget,GLintlevel,GLintxoffset,GLintyoffset, GLsizeiwidth,GLsizeiheight, GLenumformat,GLenumtype,[AllowShared]ArrayBufferView?pixels); undefinedtexSubImage2D(GLenumtarget,GLintlevel,GLintxoffset,GLintyoffset, GLenumformat,GLenumtype,TexImageSourcesource);//MaythrowDOMException //WebGL2entrypoints: undefinedtexImage2D(GLenumtarget,GLintlevel,GLintinternalformat,GLsizeiwidth,GLsizeiheight, GLintborder,GLenumformat,GLenumtype,GLintptrpboOffset); undefinedtexImage2D(GLenumtarget,GLintlevel,GLintinternalformat,GLsizeiwidth,GLsizeiheight, GLintborder,GLenumformat,GLenumtype, TexImageSourcesource);//MaythrowDOMException undefinedtexImage2D(GLenumtarget,GLintlevel,GLintinternalformat,GLsizeiwidth,GLsizeiheight, GLintborder,GLenumformat,GLenumtype,[AllowShared]ArrayBufferViewsrcData, GLuintsrcOffset); undefinedtexSubImage2D(GLenumtarget,GLintlevel,GLintxoffset,GLintyoffset,GLsizeiwidth, GLsizeiheight,GLenumformat,GLenumtype,GLintptrpboOffset); undefinedtexSubImage2D(GLenumtarget,GLintlevel,GLintxoffset,GLintyoffset,GLsizeiwidth, GLsizeiheight,GLenumformat,GLenumtype, TexImageSourcesource);//MaythrowDOMException undefinedtexSubImage2D(GLenumtarget,GLintlevel,GLintxoffset,GLintyoffset,GLsizeiwidth, GLsizeiheight,GLenumformat,GLenumtype,[AllowShared]ArrayBufferViewsrcData, GLuintsrcOffset); undefinedcompressedTexImage2D(GLenumtarget,GLintlevel,GLenuminternalformat,GLsizeiwidth, GLsizeiheight,GLintborder,GLsizeiimageSize,GLintptroffset); undefinedcompressedTexImage2D(GLenumtarget,GLintlevel,GLenuminternalformat,GLsizeiwidth, GLsizeiheight,GLintborder,[AllowShared]ArrayBufferViewsrcData, optionalGLuintsrcOffset=0,optionalGLuintsrcLengthOverride=0); undefinedcompressedTexSubImage2D(GLenumtarget,GLintlevel,GLintxoffset,GLintyoffset, GLsizeiwidth,GLsizeiheight,GLenumformat,GLsizeiimageSize,GLintptroffset); undefinedcompressedTexSubImage2D(GLenumtarget,GLintlevel,GLintxoffset,GLintyoffset, GLsizeiwidth,GLsizeiheight,GLenumformat, [AllowShared]ArrayBufferViewsrcData, optionalGLuintsrcOffset=0, optionalGLuintsrcLengthOverride=0); undefineduniform1fv(WebGLUniformLocation?location,Float32Listdata,optionalGLuintsrcOffset=0, optionalGLuintsrcLength=0); undefineduniform2fv(WebGLUniformLocation?location,Float32Listdata,optionalGLuintsrcOffset=0, optionalGLuintsrcLength=0); undefineduniform3fv(WebGLUniformLocation?location,Float32Listdata,optionalGLuintsrcOffset=0, optionalGLuintsrcLength=0); undefineduniform4fv(WebGLUniformLocation?location,Float32Listdata,optionalGLuintsrcOffset=0, optionalGLuintsrcLength=0); undefineduniform1iv(WebGLUniformLocation?location,Int32Listdata,optionalGLuintsrcOffset=0, optionalGLuintsrcLength=0); undefineduniform2iv(WebGLUniformLocation?location,Int32Listdata,optionalGLuintsrcOffset=0, optionalGLuintsrcLength=0); undefineduniform3iv(WebGLUniformLocation?location,Int32Listdata,optionalGLuintsrcOffset=0, optionalGLuintsrcLength=0); undefineduniform4iv(WebGLUniformLocation?location,Int32Listdata,optionalGLuintsrcOffset=0, optionalGLuintsrcLength=0); undefineduniformMatrix2fv(WebGLUniformLocation?location,GLbooleantranspose,Float32Listdata, optionalGLuintsrcOffset=0,optionalGLuintsrcLength=0); undefineduniformMatrix3fv(WebGLUniformLocation?location,GLbooleantranspose,Float32Listdata, optionalGLuintsrcOffset=0,optionalGLuintsrcLength=0); undefineduniformMatrix4fv(WebGLUniformLocation?location,GLbooleantranspose,Float32Listdata, optionalGLuintsrcOffset=0,optionalGLuintsrcLength=0); /*Readingbackpixels*/ //WebGL1: undefinedreadPixels(GLintx,GLinty,GLsizeiwidth,GLsizeiheight,GLenumformat,GLenumtype, [AllowShared]ArrayBufferView?dstData); //WebGL2: undefinedreadPixels(GLintx,GLinty,GLsizeiwidth,GLsizeiheight,GLenumformat,GLenumtype, GLintptroffset); undefinedreadPixels(GLintx,GLinty,GLsizeiwidth,GLsizeiheight,GLenumformat,GLenumtype, [AllowShared]ArrayBufferViewdstData,GLuintdstOffset); }; [Exposed=(Window,Worker)] interfaceWebGL2RenderingContext { }; WebGL2RenderingContextincludesWebGLRenderingContextBase; WebGL2RenderingContextincludesWebGL2RenderingContextBase; WebGL2RenderingContextincludesWebGL2RenderingContextOverloads; Morebindingpoints voidbindBuffer(GLenumtarget,WebGLBuffer?buffer) (OpenGLES3.0.6§2.10.1, manpage) BindsthegivenWebGLBufferobjecttothegivenbindingpoint(target).targetisgiveninthefollowingtable: target ARRAY_BUFFER COPY_READ_BUFFER COPY_WRITE_BUFFER ELEMENT_ARRAY_BUFFER PIXEL_PACK_BUFFER PIXEL_UNPACK_BUFFER TRANSFORM_FEEDBACK_BUFFER UNIFORM_BUFFER Iftargetisnotinthetableabove,generatesanINVALID_ENUMerror. RefertoBufferObjectBindingrestrictionsbelow. voidbindFramebuffer(GLenumtarget,WebGLFramebuffer?framebuffer) (OpenGLES3.0.6§4.4.1, manpage) BindsthegivenWebGLFramebufferobjecttothegivenbindingpoint(target).targetisgiveninthefollowingtable: target FRAMEBUFFER READ_FRAMEBUFFER DRAW_FRAMEBUFFER Iftargetisnotinthetableabove,generatesanINVALID_ENUMerror. voidbindTexture(GLenumtarget,WebGLTexture?texture) (OpenGLES3.0.6§3.8.1, manpage) BindsthegivenWebGLTextureobjecttothegivenbindingpoint(target).targetisgiveninthefollowingtable: target TEXTURE_2D TEXTURE_3D TEXTURE_2D_ARRAY TEXTURE_CUBE_MAP Iftargetisnotinthetableabove,generatesanINVALID_ENUMerror. Settingandgettingstate anygetParameter(GLenumpname) (OpenGLES3.0.6§6.1.1, glGetOpenGLES3.0manpage, glGetStringOpenGLES3.0manpage) Returnthevalueforthepassedpname.Aswellassupportingall thepname/typevaluesfromWebGL1.0,thefollowingparametersaresupported: pnamereturnedtype COPY_READ_BUFFER_BINDINGWebGLBuffer COPY_WRITE_BUFFER_BINDINGWebGLBuffer DRAW_BUFFERiGLenum DRAW_FRAMEBUFFER_BINDINGWebGLFramebuffer FRAGMENT_SHADER_DERIVATIVE_HINTGLenum MAX_3D_TEXTURE_SIZEGLint MAX_ARRAY_TEXTURE_LAYERSGLint MAX_CLIENT_WAIT_TIMEOUT_WEBGLGLint64 MAX_COLOR_ATTACHMENTSGLint MAX_COMBINED_FRAGMENT_UNIFORM_COMPONENTSGLint64 MAX_COMBINED_UNIFORM_BLOCKSGLint MAX_COMBINED_VERTEX_UNIFORM_COMPONENTSGLint64 MAX_DRAW_BUFFERSGLint MAX_ELEMENT_INDEXGLint64 MAX_ELEMENTS_INDICESGLint MAX_ELEMENTS_VERTICESGLint MAX_FRAGMENT_INPUT_COMPONENTSGLint MAX_FRAGMENT_UNIFORM_BLOCKSGLint MAX_FRAGMENT_UNIFORM_COMPONENTSGLint MAX_PROGRAM_TEXEL_OFFSETGLint MAX_SAMPLESGLint MAX_SERVER_WAIT_TIMEOUTGLint64 MAX_TEXTURE_LOD_BIASGLfloat MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTSGLint MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBSGLint MAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTSGLint MAX_UNIFORM_BLOCK_SIZEGLint64 MAX_UNIFORM_BUFFER_BINDINGSGLint MAX_VARYING_COMPONENTSGLint MAX_VERTEX_OUTPUT_COMPONENTSGLint MAX_VERTEX_UNIFORM_BLOCKSGLint MAX_VERTEX_UNIFORM_COMPONENTSGLint MIN_PROGRAM_TEXEL_OFFSETGLint PACK_ROW_LENGTHGLint PACK_SKIP_PIXELSGLint PACK_SKIP_ROWSGLint PIXEL_PACK_BUFFER_BINDINGWebGLBuffer PIXEL_UNPACK_BUFFER_BINDINGWebGLBuffer RASTERIZER_DISCARDGLboolean READ_BUFFERGLenum READ_FRAMEBUFFER_BINDINGWebGLFramebuffer SAMPLER_BINDINGWebGLSampler TEXTURE_BINDING_2D_ARRAYWebGLTexture TEXTURE_BINDING_3DWebGLTexture TRANSFORM_FEEDBACK_ACTIVEGLboolean TRANSFORM_FEEDBACK_BINDINGWebGLTransformFeedback TRANSFORM_FEEDBACK_BUFFER_BINDINGWebGLBuffer TRANSFORM_FEEDBACK_PAUSEDGLboolean UNIFORM_BUFFER_BINDINGWebGLBuffer UNIFORM_BUFFER_OFFSET_ALIGNMENTGLint UNPACK_IMAGE_HEIGHTGLint UNPACK_ROW_LENGTHGLint UNPACK_SKIP_IMAGESGLint UNPACK_SKIP_PIXELSGLint UNPACK_SKIP_ROWSGLint VERTEX_ARRAY_BINDINGWebGLVertexArrayObject Allqueriesreturningsequencesortypedarraysreturnanewobjecteachtime. IfpnameisnotinthetableaboveandisnotoneofparameternamessupportedbyWebGL1.0,generatesanINVALID_ENUMerrorandreturnsnull. ThefollowingpnameargumentsreturnastringdescribingsomeaspectofthecurrentWebGLimplementation: VERSION ReturnsaversionorreleasenumberoftheformWebGL2.0. SHADING_LANGUAGE_VERSION ReturnsaversionorreleasenumberoftheformWebGLGLSLES3.00. ForRED_BITS,GREEN_BITS,BLUE_BITS,andALPHA_BITS,ifactivecolorattachmentsofthedrawframebufferdonothaveidenticalformats,generatesanINVALID_OPERATIONerrorandreturns0. anygetIndexedParameter(GLenumtarget,GLuintindex) (OpenGLES3.0.6§6.1.1, glGetOpenGLES3.0manpage) Returntheindexedvalueforthepassedtarget.Thetypereturnedisthenaturaltypefortherequestedpname, asgiveninthefollowingtable: targetreturnedtype TRANSFORM_FEEDBACK_BUFFER_BINDINGWebGLBuffer TRANSFORM_FEEDBACK_BUFFER_SIZEGLsizeiptr TRANSFORM_FEEDBACK_BUFFER_STARTGLintptr UNIFORM_BUFFER_BINDINGWebGLBuffer UNIFORM_BUFFER_SIZEGLsizeiptr UNIFORM_BUFFER_STARTGLintptr Iftargetisnotinthetableabove,generatesanINVALID_ENUMerror. Ifindexisoutsideofthevalidrangefortheindexedstatetarget,generatesanINVALID_VALUEerror. IfanOpenGLerrorisgenerated,returnsnull. GLbooleanisEnabled(GLenumcap) (OpenGLES3.0.6§6.1.1, OpenGLES3.0manpage) InadditiontoallofthecapvaluesfromWebGL1.0,RASTERIZER_DISCARDissupported. voidpixelStorei(GLenumpname,GLintparam) (OpenGLES3.0.6§3.7.1, OpenGLES3.0manpage) InadditiontotheparametersfromWebGL1.0,theWebGL2.0specificationacceptsthefollowingextraparameters: pname PACK_ROW_LENGTH PACK_SKIP_PIXELS PACK_SKIP_ROWS UNPACK_ROW_LENGTH UNPACK_IMAGE_HEIGHT UNPACK_SKIP_PIXELS UNPACK_SKIP_ROWS UNPACK_SKIP_IMAGES Bufferobjects voidbufferData(GLenumtarget,[AllowShared]ArrayBufferViewsrcData,GLenumusage,GLuintsrcOffset,optionalGLuintlength=0); (OpenGLES3.0.6§2.10.2, manpage) SetthesizeofthecurrentlyboundWebGLBufferobject,thencopyasub-regionofsrcDatatothebufferobject. Letbufbethebufferboundtotarget. Iflengthis0: IfsrcDataisaDataView,letcopyLengthbesrcData.byteLength-srcOffset;thetypedelementsinthetextbelowarebytes. Otherwise,letcopyLengthbesrcData.length-srcOffset. Otherwise,letcopyLengthbelength. IfsrcDataisaDataView,setthesizeofbuftocopyLength;otherwise,setthesizeofbuftocopyLength*srcData.BYTES_PER_ELEMENT. IfsrcDataisaDataView,letelementSizebe1;otherwise,letelementSizebesrcData.BYTES_PER_ELEMENT. IfcopyLengthisgreaterthanzero,copycopyLengthtypedelements (eachofsizeelementSize)fromsrcDataintobuf, readingsrcDatastartingatelementindexsrcOffset. IfcopyLengthis0,nodataiswrittentobuf,butthisdoes notcauseaGLerrortobegenerated. IfnoWebGLBufferisboundtotarget,generatesanINVALID_OPERATIONerror. IfsrcOffsetisgreaterthansrcData.length(orsrcData.byteLengthforDataView),generatesanINVALID_VALUEerror. IfsrcOffset+copyLengthisgreaterthansrcData.length(orsrcData.byteLengthforDataView),generatesanINVALID_VALUEerror. Ifanyerrorisgenerated,buf'ssizeisunmodified,andnodataiswrittentoit. voidbufferSubData(GLenumtarget,GLintptrdstByteOffset,[AllowShared]ArrayBufferViewsrcData,GLuintsrcOffset,optionalGLuintlength=0); (OpenGLES3.0.6§2.10.2, manpage) Copyasub-regionofsrcDatatothecurrentlyboundWebGLBufferobject. Letbufbethebufferboundtotarget. Iflengthis0: IfsrcDataisaDataView,letcopyLengthbesrcData.byteLength-srcOffset;thetypedelementsinthetextbelowarebytes. Otherwise,letcopyLengthbesrcData.length-srcOffset. Otherwise,letcopyLengthbelength. IfsrcDataisaDataView,letcopyByteLengthbecopyLength;otherwise,letcopyByteLengthbecopyLength*srcData.BYTES_PER_ELEMENT. IfsrcDataisaDataView,letelementSizebe1;otherwise,letelementSizebesrcData.BYTES_PER_ELEMENT. IfcopyLengthisgreaterthanzero,copycopyLengthtypedelements (eachofsizeelementSize)fromsrcDataintobuf, readingsrcDatastartingatelementindexsrcOffset,and writingbufstartingatbyteoffsetdstByteOffset. IfcopyLengthis0,nodataiswrittentobuf,butthisdoes notcauseaGLerrortobegenerated. IfnoWebGLBufferisboundtotarget,generatesanINVALID_OPERATIONerror. IfdstByteOffsetislessthanzero,generatesanINVALID_VALUEerror. IfdstByteOffset+copyByteLengthisgreaterthanthesizeofbuf,generatesanINVALID_VALUEerror. IfsrcOffsetisgreaterthansrcData.length(orsrcData.byteLengthforDataView),generatesanINVALID_VALUEerror. IfsrcOffset+copyLengthisgreaterthansrcData.length(orsrcData.byteLengthforDataView),generatesanINVALID_VALUEerror. Ifanyerrorisgenerated,nodataiswrittentobuf. anygetBufferParameter(GLenumtarget,GLenumpname) (OpenGLES3.0.6§6.1.9, manpage) Returnthevalueforthepassedpname.InadditiontosupportingqueryingwiththepnameBUFFER_USAGE asinWebGL1.0,queryingwiththepnameBUFFER_SIZEreturnsthebuffersizeasavalueoftype GLsizeiptr. voidcopyBufferSubData(GLenumreadTarget,GLenumwriteTarget,GLintptrreadOffset,GLintptrwriteOffset,GLsizeiptrsize) (OpenGLES3.0.6§2.10.5, manpage) CopypartofthedataofthebufferboundtoreadTargettothebufferboundtowriteTarget. SeeCopyingBuffersforrestrictionsimposedbytheWebGL2.0API. undefinedgetBufferSubData(GLenumtarget,GLintptrsrcByteOffset, [AllowShared]ArrayBufferViewdstBuffer, optionalGLuintdstOffset=0, optionalGLuintlength=0) ReadsbackdatafromtheboundWebGLBufferintodstBuffer. Letbufbethebufferboundtotarget. Iflengthis0: IfdstBufferisaDataView,letcopyLengthbedstBuffer.byteLength-dstOffset;thetypedelementsinthetextbelowarebytes. Otherwise,letcopyLengthbedstBuffer.length-dstOffset. Otherwise,letcopyLengthbelength. IfdstBufferisaDataView,letcopyByteLengthbecopyLength;otherwise,letcopyByteLengthbecopyLength*dstBuffer.BYTES_PER_ELEMENT. IfdstBufferisaDataView,letelementSizebe1;otherwise,letelementSizebedstBuffer.BYTES_PER_ELEMENT. IfcopyLengthisgreaterthanzero, copycopyLengthtypedelements(eachofsizeelementSize) frombufintodstBuffer, readingbufstartingatbyteindexsrcByteOffsetand writingintodstBufferstartingatelementindexdstOffset. IfcopyLengthis0,nodataiswrittentodstBuffer,but thisdoesnotcauseaGLerrortobegenerated. IfnoWebGLBufferisboundtotarget, generatesanINVALID_OPERATIONerror. IftargetisTRANSFORM_FEEDBACK_BUFFER, andanytransformfeedbackobjectiscurrentlyactive, generatesanINVALID_OPERATIONerror. IfdstOffsetisgreaterthandstBuffer.length (ordstBuffer.byteLengthinthecaseofDataView),generates anINVALID_VALUEerror. IfdstOffset+copyLengthisgreaterthandstBuffer.length (ordstBuffer.byteLengthinthecaseofDataView),generates anINVALID_VALUEerror. IfsrcByteOffsetislessthanzero, generatesanINVALID_VALUEerror. IfsrcByteOffset+copyByteLengthisgreaterthanthesize ofbuf,generatesanINVALID_OPERATIONerror. Ifanyerrorisgenerated,nodataiswrittentodstBuffer. IfthebufferiswrittenandreadsequentiallybyotheroperationsandgetBufferSubData, itistheresponsibilityoftheWebGLAPItoensurethatdataareaccessedconsistently.Thisapplies evenifthebufferiscurrentlyboundtoatransformfeedbackbindingpoint. Thisisablockingoperation,asWebGLmustcompletelyfinishall previouswritesintothesourcebufferinordertoreturnaresult. Inmulti-processWebGLimplementations,getBufferSubData canalsoincuranexpensiveinter-processround-triptofetchthe resultfromtheremoteprocess. Theusermaybeabletoavoidthesecostsbysignallingintentto readbackfromthebuffer: InsertafenceSyncafterwritingtothesource buffer,andwaitforittopassbeforeperformingthe getBufferSubDataoperation. Allocatebufferswitha_READusagehintiftheyare tobeusedasareadbacksource.(Avoidoveruseofbuffers allocatedwith_READusagehints,astheymayincur overheadinmaintainingashadowcopyofthebufferdata.) Framebufferobjects [WebGLHandlesContextLoss]GLenumcheckFramebufferStatus(GLenumtarget) (OpenGLES3.0.6§4.4.4.2, manpage) OnlydifferencesfromcheckFramebufferStatusinWebGL1.0aredescribedhere. targetmustbeDRAW_FRAMEBUFFER,READ_FRAMEBUFFERorFRAMEBUFFER.FRAMEBUFFERisequivalenttoDRAW_FRAMEBUFFER. ReturnsFRAMEBUFFER_UNSUPPORTEDifdepthandstencilattachments,ifpresent,arenotthesameimage.SeeFramebufferObjectAttachmentsfordetaileddiscussion. ReturnsFRAMEBUFFER_INCOMPLETE_MULTISAMPLEifthevaluesofRENDERBUFFER_SAMPLESaredifferentamongattachedrenderbuffers,orarenon-zeroiftheattachedimagesareamixofrenderbuffersandtextures. ReturnsFRAMEBUFFER_INCOMPLETE_DIMENSIONSifattachedimageshavedifferentwidth,height,anddepth(for3Dtextures)orarraysize(for2Darraytextures).SeecheckFramebufferStatusmayreturnFRAMEBUFFER_INCOMPLETE_DIMENSIONS. ReturnsFRAMEBUFFER_UNSUPPORTEDifthesameimageisattachedtomorethanonecolor attachmentpoint.SeeFramebuffercolorattachments. anygetFramebufferAttachmentParameter(GLenumtarget,GLenumattachment,GLenumpname) (OpenGLES3.0.6§6.1.13, similartoglGetFramebufferAttachmentParameteriv) Returnthevalueforthepassedpnamegiventhepassedtargetandattachment.Thetype returnedisthenaturaltypefortherequestedpname,asgiveninthefollowingtable: pnamereturnedtype FRAMEBUFFER_ATTACHMENT_ALPHA_SIZEGLint FRAMEBUFFER_ATTACHMENT_BLUE_SIZEGLint FRAMEBUFFER_ATTACHMENT_COLOR_ENCODINGGLenum FRAMEBUFFER_ATTACHMENT_COMPONENT_TYPEGLenum FRAMEBUFFER_ATTACHMENT_DEPTH_SIZEGLint FRAMEBUFFER_ATTACHMENT_GREEN_SIZEGLint FRAMEBUFFER_ATTACHMENT_OBJECT_NAMEWebGLRenderbufferorWebGLTexture FRAMEBUFFER_ATTACHMENT_OBJECT_TYPEGLenum FRAMEBUFFER_ATTACHMENT_RED_SIZEGLint FRAMEBUFFER_ATTACHMENT_STENCIL_SIZEGLint FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACEGLint FRAMEBUFFER_ATTACHMENT_TEXTURE_LAYERGLint FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVELGLint Ifpnameisnotinthetableabove,generatesanINVALID_ENUMerror. IfanOpenGLerrorisgenerated,returnsnull. IfattachmentisDEPTH_STENCIL_ATTACHMENTanddifferentimagesareattachedtothedepthandstencilattachmentpoints,generatesanINVALID_OPERATIONerror.SeeFramebufferObjectAttachmentsfordetaileddiscussion. voidblitFramebuffer(GLintsrcX0,GLintsrcY0,GLintsrcX1,GLintsrcY1,GLintdstX0,GLintdstY0,GLintdstX1,GLintdstY1,GLbitfieldmask,GLenumfilter) (OpenGLES3.0.6§4.3.3, manpage) Transferarectangleofpixelvaluesfromoneregionofthereadframebuffertoanotherinthedraw framebuffer.IfthevalueofSAMPLE_BUFFERSforthereadframebufferisoneandthevalueof SAMPLE_BUFFERSforthedrawframebufferiszero,thesamplescorrespondingtoeachpixellocationin thesourceareconvertedtoasinglesamplebeforebeingwrittentothedestination. Anydistinationpixelwho'scentercorrespondstoapointoutsidethesourcebufferremainuntouched. WhenblittingtothecolorattachmentoftheWebGLcontext'sdefaultbackbuffer,acontext createdwithalpha:falseisconsideredtohaveinternal formatRGB8,whileacontextcreatedwithalpha:trueisconsidered tohaveinternalformatRGBA8. Ifthisfunctionattemptstoblittoamissingattachmentofacompleteframebuffer,nothingis blittedtothatattachmentandnoerrorisgenerated perDrawingtoaMissingAttachment. Ifthisfunctionattemptstoreadfromamissingattachmentofacompleteframebuffer,andatleastone drawbufferhasanimagetobeblitted,anINVALID_OPERATIONerrorisgenerated perReadingfromaMissingAttachment. voidframebufferTextureLayer(GLenumtarget,GLenumattachment,WebGLTexture?texture,GLintlevel,GLintlayer) (OpenGLES3.0.6§4.4.2.4, manpage) IftexturewasgeneratedbyadifferentWebGL2RenderingContext thanthisone,generatesanINVALID_OPERATIONerror. voidinvalidateFramebuffer(GLenumtarget,sequenceattachments) (OpenGLES3.0.6§4.5, manpage) EquivalenttocallinginvalidateSubFramebufferwithxandy setto0andwidthandheightsettothelargestframebufferobject's attachments'widthandheight. voidinvalidateSubFramebuffer(GLenumtarget,sequenceattachments,GLintx,GLinty,GLsizeiwidth,GLsizeiheight) (OpenGLES3.0.6§4.5, manpage) SignaltheGLthatitneednotpreserveallcontentsofaboundframebufferobject. voidreadBuffer(GLenumsrc) (OpenGLES3.0.6§4.3.1, manpage) Specifyacolorbufferofthereadframebufferasthereadbuffer. Renderbufferobjects anygetInternalformatParameter(GLenumtarget,GLenuminternalformat,GLenumpname) (OpenGLES3.0.6§6.1.15, manpage) Returnthevalueforthepassedpnamegiventhepassedtargetandinternalformat.Thetype returnedisgiveninthefollowingtable: pnamereturnedtype SAMPLESInt32Array Ifpnameisnotinthetableabove,generatesanINVALID_ENUMerror. IfanOpenGLerrorisgenerated,returnsnull. EachqueryforSAMPLESreturnsanewtypedarrayobjectinstance. anygetRenderbufferParameter(GLenumtarget,GLenumpname) (OpenGLES2.0§6.1.14, similartoglGetRenderbufferParameteriv) Returnthevalueforthepassedpnamegiventhepassedtarget.Thetypereturnedisthenatural typefortherequestedpname,asgiveninthefollowingtable: pnamereturnedtype RENDERBUFFER_WIDTHGLint RENDERBUFFER_HEIGHTGLint RENDERBUFFER_INTERNAL_FORMATGLenum RENDERBUFFER_RED_SIZEGLint RENDERBUFFER_GREEN_SIZEGLint RENDERBUFFER_BLUE_SIZEGLint RENDERBUFFER_ALPHA_SIZEGLint RENDERBUFFER_DEPTH_SIZEGLint RENDERBUFFER_SAMPLESGLint RENDERBUFFER_STENCIL_SIZEGLint Ifpnameisnotinthetableabove,generatesanINVALID_ENUMerror. IfanOpenGLerrorisgenerated,returnsnull. voidrenderbufferStorage(GLenumtarget,GLenuminternalformat,GLsizeiwidth,GLsizeiheight) (OpenGLES3.0.6§4.4.2.1, manpage) AcceptsinternalformatsfromOpenGLES3.0asdetailedinthespecificationandmanpage. TobebackwardcompatiblewithWebGL1,alsoacceptsinternalformatDEPTH_STENCIL,whichshouldbemappedtoDEPTH24_STENCIL8byimplementations. voidrenderbufferStorageMultisample(GLenumtarget,GLsizeisamples,GLenuminternalformat,GLsizeiwidth,GLsizeiheight) (OpenGLES3.0.6§4.4.2.1, manpage) GeneratesINVALID_OPERATIONwhen`internalFormat==DEPTH_STENCIL&&samples>0`. Textureobjects Textureobjectsprovidestorageandstatefortexturingoperations.IfnoWebGLTextureisbound (e.g.,passingnullor0tobindTexture)thenattemptstomodifyorquerythetextureobjectshall generateanINVALID_OPERATIONerror.Thisisindicatedinthefunctionsbelowincases whereTheOpenGLES3.0specificationallowsthefunctiontochangethedefaulttexture. anygetTexParameter(GLenumtarget,GLenumpname) (OpenGLES3.0.6§6.1.3, manpage) Returnthevalueforthepassedpnamegiventhepassedtarget.Thetypereturnedisthenaturaltypeforthe requestedpname,asgiveninthefollowingtable: pnamereturnedtype TEXTURE_BASE_LEVELGLint TEXTURE_COMPARE_FUNCGLenum TEXTURE_COMPARE_MODEGLenum TEXTURE_IMMUTABLE_FORMATGLboolean TEXTURE_IMMUTABLE_LEVELSGLuint TEXTURE_MAG_FILTERGLenum TEXTURE_MAX_LEVELGLint TEXTURE_MAX_LODGLfloat TEXTURE_MIN_FILTERGLenum TEXTURE_MIN_LODGLfloat TEXTURE_WRAP_RGLenum TEXTURE_WRAP_SGLenum TEXTURE_WRAP_TGLenum Ifpnameisnotinthetableabove,generatesanINVALID_ENUMerror. IfanattemptismadetocallthisfunctionwithnoWebGLTexturebound(seeabove),generatesan INVALID_OPERATIONerror. IfanOpenGLerrorisgenerated,returnsnull. voidtexParameterf(GLenumtarget,GLenumpname,GLfloatparam) (OpenGLES3.0.6§3.8.7, manpage) Setthevalueforthepassedpnamegiventhepassedtarget.pnameisgiveninthefollowingtable: pname TEXTURE_BASE_LEVEL TEXTURE_COMPARE_FUNC TEXTURE_COMPARE_MODE TEXTURE_MAG_FILTER TEXTURE_MAX_LEVEL TEXTURE_MAX_LOD TEXTURE_MIN_FILTER TEXTURE_MIN_LOD TEXTURE_WRAP_R TEXTURE_WRAP_S TEXTURE_WRAP_T Ifpnameisnotinthetableabove,generatesanINVALID_ENUMerror. IfanattemptismadetocallthisfunctionwithnoWebGLTexturebound(seeabove),generatesan INVALID_OPERATIONerror. voidtexParameteri(GLenumtarget,GLenumpname,GLintparam) (OpenGLES3.0.6§3.8.7, manpage) Setthevalueforthepassedpnamegiventhepassedtarget.pnameisthissamewiththatoftexParameterf,asgiveninthetableabove. Ifpnameisnotinthetableabove,generatesanINVALID_ENUMerror. IfanattemptismadetocallthisfunctionwithnoWebGLTexturebound(seeabove),generatesan INVALID_OPERATIONerror. voidtexStorage2D(GLenumtarget,GLsizeilevels,GLenuminternalformat,GLsizeiwidth,GLsizeiheight) (OpenGLES3.0.6§3.8.4, manpage) Specifyallthelevelsofatwo-dimensionalorcube-maptextureatthesametime. Theimagecontentsaresetasifabufferofsufficientsizeinitializedto0wouldbepassedto eachtexImage2D(orcompressedTexImage2Dforcompressedformats)callinthepseudocodein TheOpenGLES3.0specificationsection3.8.4 (OpenGLES3.0.6§3.8.4). texStorage2Dshouldbeconsideredapreferredalternativeto texImage2D.ItmayhavelowermemorycoststhantexImage2Dinsome implementations. voidtexStorage3D(GLenumtarget,GLsizeilevels,GLenuminternalformat,GLsizeiwidth,GLsizeiheight,GLsizeidepth) (OpenGLES3.0.6§3.8.4, manpage) Specifyallthelevelsofathree-dimensionaltextureortwo-dimensionalarraytexture. Theimagecontentsaresetasifabufferofsufficientsizeinitializedto0wouldbepassedto eachtexImage3D(orcompressedTexImage3Dforcompressedformats)callinthepseudocodein TheOpenGLES3.0specificationsection3.8.4 (OpenGLES3.0.6§3.8.4). undefinedtexImage2D(GLenumtarget,GLintlevel,GLintinternalformat,GLsizeiwidth, GLsizeiheight,GLintborder,GLenumformat,GLenumtype, [AllowShared]ArrayBufferViewsrcData,GLuintsrcOffset) (OpenGLES3.0.6§3.8.3, manpage) OnlydifferencesfromtexImage2DinWebGL1.0aredescribedhere. IfaWebGLBufferisboundtothePIXEL_UNPACK_BUFFERtarget,generatesanINVALID_OPERATIONerror. SizedinternalformatsaresupportedinWebGL2.0andinternalformatisnolongerrequiredtobethesameasformat.Instead,thecombinationofinternalformat,format,andtypemustbelistedinTable1or2frommanpage. IftypeisspecifiedasFLOAT_32_UNSIGNED_INT_24_8_REV, srcDatamustbenull;otherwise,generatesanINVALID_OPERATION error. ThetypeofsrcDatamustmatchthetypeaccordingtothefollowing table;otherwise,generatesanINVALID_OPERATIONerror: typeofsrcDatatype Int8ArrayBYTE Uint8ArrayUNSIGNED_BYTE Uint8ClampedArrayUNSIGNED_BYTE Int16ArraySHORT Uint16ArrayUNSIGNED_SHORT Uint16ArrayUNSIGNED_SHORT_5_6_5 Uint16ArrayUNSIGNED_SHORT_5_5_5_1 Uint16ArrayUNSIGNED_SHORT_4_4_4_4 Int32ArrayINT Uint32ArrayUNSIGNED_INT Uint32ArrayUNSIGNED_INT_5_9_9_9_REV Uint32ArrayUNSIGNED_INT_2_10_10_10_REV Uint32ArrayUNSIGNED_INT_10F_11F_11F_REV Uint32ArrayUNSIGNED_INT_24_8 Uint16ArrayHALF_FLOAT Float32ArrayFLOAT Ifpixelstoreparameterconstraintsarenotmet, generatesanINVALID_OPERATIONerror. ReadingfromsrcDatabeginssrcOffsetelementsinto srcData.(ElementsarebytesforUint8Array,int32sforInt32Array,etc.) Ifthere'snotenoughdatainsrcDatastartingatsrcOffset, generateINVALID_OPERATION. [throws] undefinedtexImage2D(GLenumtarget,GLintlevel,GLintinternalformat,GLsizeiwidth, GLsizeiheight,GLintborder,GLenumformat,GLenumtype, TexImageSourcesource)//MaythrowDOMException (OpenGLES3.0.6§3.8.3, manpage) OnlydifferencesfromtexImage2DinWebGL1.0aredescribedhere. ConversiontonewformatsintroducedinWebGL2.0isperformedaccordingtothefollowingtable. SourceDOMImageFormat TargetWebGLFormat RED RG Grayscale(1channel) R=sourceGray R=sourceGrayG=0 Grayscale+Alpha(2channels) R=sourceGray R=sourceGrayG=0 Color(3channels)Color+Alpha(4channels) R=sourceRed R=sourceRedG=sourceGreen UploadingsubregionsofelementsisdetailedinPixel storeparametersforuploadsfromTexImageSource. IfaWebGLBufferisboundtothePIXEL_UNPACK_BUFFERtarget,generatesanINVALID_OPERATIONerror. SizedinternalformatsaresupportedinWebGL2.0andinternalformatisnolongerrequiredtobethesameasformat.Instead,thecombinationofinternalformat,format,andtypemustbelistedinthefollowingtable: InternalFormatFormatType RGBRGBUNSIGNED_BYTEUNSIGNED_SHORT_5_6_5 RGBARGBAUNSIGNED_BYTE,UNSIGNED_SHORT_4_4_4_4UNSIGNED_SHORT_5_5_5_1 LUMINANCE_ALPHALUMINANCE_ALPHAUNSIGNED_BYTE LUMINANCELUMINANCEUNSIGNED_BYTE ALPHAALPHAUNSIGNED_BYTE R8REDUNSIGNED_BYTE R16FREDHALF_FLOATFLOAT R32FREDFLOAT R8UIRED_INTEGERUNSIGNED_BYTE RG8RGUNSIGNED_BYTE RG16FRGHALF_FLOATFLOAT RG32FRGFLOAT RG8UIRG_INTEGERUNSIGNED_BYTE RGB8RGBUNSIGNED_BYTE SRGB8RGBUNSIGNED_BYTE RGB565RGBUNSIGNED_BYTEUNSIGNED_SHORT_5_6_5 R11F_G11F_B10FRGBUNSIGNED_INT_10F_11F_11F_REVHALF_FLOATFLOAT RGB9_E5RGBHALF_FLOATFLOAT RGB16FRGBHALF_FLOATFLOAT RGB32FRGBFLOAT RGB8UIRGB_INTEGERUNSIGNED_BYTE RGBA8RGBAUNSIGNED_BYTE SRGB8_ALPHA8RGBAUNSIGNED_BYTE RGB5_A1RGBAUNSIGNED_BYTEUNSIGNED_SHORT_5_5_5_1 RGB10_A2RGBAUNSIGNED_INT_2_10_10_10_REV RGBA4RGBAUNSIGNED_BYTEUNSIGNED_SHORT_4_4_4_4 RGBA16FRGBAHALF_FLOATFLOAT RGBA32FRGBAFLOAT RGBA8UIRGBA_INTEGERUNSIGNED_BYTE WhenthedatasourceisaDOMelement(HTMLImageElement,HTMLCanvasElement,orHTMLVideoElement),orisanImageBitmap,ImageData,orOffscreenCanvasobject,commonlyeachchannel'srepresentationisanunsignedintegertypeofatleast8bits.Convertingsuchrepresentationtosignedintegersorunsignedintegerswithmorebitsisnotclearlydefined.Forexample,whenconvertingRGBA8toRGBA16UI,itisunclearwhetherornottheintentionistoscaleupvaluestothefullrangeofa16-bitunsignedinteger.Therefore,onlyconvertingtounsignedintegerofatmost8bits,halffloat,orfloatisallowed. voidtexImage2D(GLenumtarget,GLintlevel,GLintinternalformat,GLsizeiwidth,GLsizeiheight,GLintborder,GLenumformat,GLenumtype,GLintptroffset) (OpenGLES3.0.6§3.8.3, manpage) UploaddatatothecurrentlyboundWebGLTexturefromtheWebGLBufferboundtothePIXEL_UNPACK_BUFFERtarget. offsetisthebyteoffsetintotheWebGLBuffer'sdatastore;generatesanINVALID_VALUEifit'slessthan0. Thecombinationofformat,type,andWebGLTexture'sinternalformatmustbelistedinTable1or2frommanpage. IfanattemptismadetocallthefunctionwithnoWebGLTexturebound,generatesanINVALID_OPERATIONerror. IfnoWebGLBufferisboundtothePIXEL_UNPACK_BUFFERtarget,generatesanINVALID_OPERATIONerror. Ifpixelstoreparameterconstraintsarenotmet, generatesanINVALID_OPERATIONerror. undefinedtexSubImage2D(GLenumtarget,GLintlevel,GLintxoffset,GLintyoffset, GLsizeiwidth,GLsizeiheight,GLenumformat,GLenumtype, [AllowShared]ArrayBufferViewsrcData,GLuintsrcOffset) (OpenGLES3.0.6§3.8.5, manpage) OnlydifferencesfromtexSubImage2DinWebGL1.0aredescribedhere. IfaWebGLBufferisboundtothePIXEL_UNPACK_BUFFERtarget,generatesanINVALID_OPERATIONerror. Thecombinationofformat,type,andWebGLTexture'sinternalformatmustbelistedinTable1or2frommanpage. ThetypeofsrcDatamustmatchthetypeaccordingtotheabovetable;otherwise,generatesan INVALID_OPERATIONerror. SeePixelStorageParametersforWebGL-specificpixelstorageparametersthataffectthebehaviorofthisfunction. Ifpixelstoreparameterconstraintsarenotmet, generatesanINVALID_OPERATIONerror. ReadingfromsrcDatabeginssrcOffsetelementsinto srcData.(ElementsarebytesforUint8Array,int32sforInt32Array,etc.) Ifthere'snotenoughdatainsrcDatastartingatsrcOffset, generateINVALID_OPERATION. undefinedtexSubImage2D(GLenumtarget,GLintlevel,GLintxoffset,GLintyoffset, GLsizeiwidth,GLsizeiheight,GLenumformat,GLenumtype, TexImageSourcesource)//MaythrowDOMException (OpenGLES3.0.6§3.8.5, manpage) OnlydifferencesfromtexSubImage2DinWebGL1.0aredescribedhere. UploadingsubregionsofelementsisdetailedinPixel storeparametersforuploadsfromTexImageSource. IfaWebGLBufferisboundtothePIXEL_UNPACK_BUFFERtarget,generatesanINVALID_OPERATIONerror. Thecombinationofformat,type,andWebGLTexture'sinternalformatmustbelistedinthistable. undefinedtexSubImage2D(GLenumtarget,GLintlevel,GLintxoffset,GLintyoffset, GLsizeiwidth,GLsizeiheight,GLenumformat,GLenumtype, GLintptroffset) (OpenGLES3.0.6§3.8.5, manpage) Updatesasub-rectangleofthecurrentlyboundWebGLTexturewithdatafromtheWebGLBufferboundtoPIXEL_UNPACK_BUFFERtarget. offsetisthebyteoffsetintotheWebGLBuffer'sdatastore;generatesanINVALID_VALUEerrorifit'slessthan0. IfanattemptismadetocallthefunctionwithnoWebGLTexturebound,generatesanINVALID_OPERATIONerror. IfnoWebGLBufferisboundtothePIXEL_UNPACK_BUFFERtarget,generatesanINVALID_OPERATIONerror. Ifpixelstoreparameterconstraintsarenotmet, generatesanINVALID_OPERATIONerror. voidtexImage3D(GLenumtarget,GLintlevel,GLintinternalformat,GLsizeiwidth, GLsizeiheight,GLsizeidepth,GLintborder,GLenumformat,GLenumtype, [AllowShared]ArrayBufferView?srcData) voidtexImage3D(GLenumtarget,GLintlevel,GLintinternalformat,GLsizeiwidth, GLsizeiheight,GLsizeidepth,GLintborder,GLenumformat,GLenumtype, [AllowShared]ArrayBufferViewsrcData,GLuintsrcOffset) (OpenGLES3.0.6§3.8.3, manpage) Allocatesandinitializesthespecifiedmipmaplevelofathree-dimensionalortwo-dimensionalarraytexture. IfaWebGLBufferisboundtothePIXEL_UNPACK_BUFFERtarget,generatesanINVALID_OPERATIONerror. IfsrcDataisnull,abufferofsufficientsizeinitializedto0ispassed. Thecombinationofinternalformat,format,andtypemustbelistedinTable1or2frommanpage. IftypeisspecifiedasFLOAT_32_UNSIGNED_INT_24_8_REV, srcDatamustbenull;otherwise,generatesanINVALID_OPERATION error. IfsrcDataisnon-null,thetypeofsrcDatamustmatchthetype accordingtotheabovetable;otherwise, generateanINVALID_OPERATIONerror. IfanattemptismadetocallthisfunctionwithnoWebGLTexturebound(seeabove),generatesanINVALID_OPERATIONerror. SeePixelStorageParametersforWebGL-specificpixelstorageparametersthataffectthebehaviorofthisfunction. Ifpixelstoreparameterconstraintsarenotmet, generatesanINVALID_OPERATIONerror. ReadingfromsrcDatabeginssrcOffsetelementsinto srcData.(ElementsarebytesforUint8Array,int32sforInt32Array,etc.) Ifthere'snotenoughdatainsrcDatastartingatsrcOffset, generateINVALID_OPERATION. ItisrecommendedtousetexStorage3DinsteadoftexImage3Dtoallocatethree-dimensionaltextures.texImage3DmayimposeahighermemorycostcomparedtotexStorage3Dinsomeimplementations. undefinedtexImage3D(GLenumtarget,GLintlevel,GLenuminternalformat,GLsizeiwidth, GLsizeiheight,GLsizeidepth,GLintborder,GLenumformat,GLenumtype, TexImageSourcesource)//MaythrowDOMException (OpenGLES3.0.6§3.8.3, manpage) UpdatearectangularsubregionofthecurrentlyboundWebGLTexture. UploadingsubregionsofelementsisdetailedinPixel storeparametersforuploadsfromTexImageSource. SeetexImage2Dfortheinterpretationoftheformatandtypearguments,andnotesontheUNPACK_PREMULTIPLY_ALPHA_WEBGLpixelstorageparameter. SeePixelStorageParametersforWebGL-specificpixelstorageparametersthataffectthebehaviorofthisfunctionwhenitiscalledwithanyargumenttypeotherthanImageBitmap. ThefirstpixeltransferredfromthesourcetotheWebGLimplementationcorrespondstotheupperleftcornerofthesource.ThisbehaviorismodifiedbytheUNPACK_FLIP_Y_WEBGLpixelstorageparameter,exceptforImageBitmaparguments,asdescribedintheabovementionedsection. Thecombinationofformat,type,andWebGLTexture'sinternalformatmustbelistedinthistable. IfanattemptismadetocallthisfunctionwithnoWebGLTexturebound(seeabove),generatesanINVALID_OPERATIONerror. IfaWebGLBufferisboundtothePIXEL_UNPACK_BUFFERtarget,generatesanINVALID_OPERATIONerror. IfthisfunctioniscalledwithanImageDatawhosedataattributehasbeenneutered,anINVALID_VALUEerrorisgenerated. IfthisfunctioniscalledwithanImageBitmapthathasbeenneutered,anINVALID_VALUEerrorisgenerated. IfthisfunctioniscalledwithanHTMLImageElementorHTMLVideoElementwhoseorigindiffersfromtheoriginofthecontainingDocument,orwithanHTMLCanvasElement,ImageBitmap,orOffscreenCanvaswhosebitmap'sorigin-cleanflagissettofalse,aSECURITY_ERRexceptionmustbethrown.SeeOriginRestrictions. voidtexImage3D(GLenumtarget,GLintlevel,GLintinternalformat,GLsizeiwidth,GLsizeiheight,GLsizeidepth,GLintborder,GLenumformat,GLenumtype,GLintptroffset) (OpenGLES3.0.6§3.8.3, manpage) UploaddatatothecurrentlyboundWebGLTexturefromtheWebGLBufferboundtothePIXEL_UNPACK_BUFFERtarget. offsetisthebyteoffsetintotheWebGLBuffer'sdatastore;generatesanINVALID_VALUEerrorifit'slessthan0. IfanattemptismadetocallthefunctionwithnoWebGLTexturebound,generatesanINVALID_OPERATIONerror. IfnoWebGLBufferisboundtothePIXEL_UNPACK_BUFFERtarget,generatesanINVALID_OPERATIONerror. Ifpixelstoreparameterconstraintsarenotmet, generatesanINVALID_OPERATIONerror. undefinedtexSubImage3D(GLenumtarget,GLintlevel,GLintxoffset,GLintyoffset, GLintzoffset,GLsizeiwidth,GLsizeiheight,GLsizeidepth, GLenumformat,GLenumtype,[AllowShared]ArrayBufferView?srcData, optionalGLuintsrcOffset=0) (OpenGLES3.0.6§3.8.5, manpage) UpdatearectangularsubregionofthecurrentlyboundWebGLTexture. IfanattemptismadetocallthisfunctionwithnoWebGLTexturebound(seeabove),generatesanINVALID_OPERATIONerror. IfaWebGLBufferisboundtothePIXEL_UNPACK_BUFFERtarget,generatesanINVALID_OPERATIONerror. Thecombinationofformat,type,andWebGLTexture'sinternalformatmustbelistedinTable1or2frommanpage. IftypeisFLOAT_32_UNSIGNED_INT_24_8_REV,generatesanINVALID_ENUMerror. ThetypeofsrcDatamustmatchthetypeaccordingtotheabovetable;otherwise,generatesan INVALID_OPERATIONerror. IfsrcDataisnon-nullbutitssizeislessthanwhatisrequiredbythespecifiedwidth,height,depth,format,type,andpixelstorageparameters,generatesanINVALID_OPERATIONerror. SeePixelStorageParametersforWebGL-specificpixelstorageparametersthataffectthebehaviorofthisfunction. Ifpixelstoreparameterconstraintsarenotmet, generatesanINVALID_OPERATIONerror. ReadingfromsrcDatabeginssrcOffsetelementsinto srcData.(ElementsarebytesforUint8Array,int32sforInt32Array,etc.) Ifthere'snotenoughdatainsrcDatastartingatsrcOffset, generateINVALID_OPERATION. undefinedtexSubImage3D(GLenumtarget,GLintlevel,GLintxoffset,GLintyoffset, GLintzoffset,GLsizeiwidth,GLsizeiheight,GLsizeidepth, GLenumformat,GLenumtype, TexImageSourcesource)//MaythrowDOMException (OpenGLES3.0.6§3.8.5, manpage) UpdatearectangularsubregionofthecurrentlyboundWebGLTexture. UploadingsubregionsofelementsisdetailedinPixel storeparametersforuploadsfromTexImageSource. SeetexImage2Dfortheinterpretationoftheformatandtypearguments,andnotesontheUNPACK_PREMULTIPLY_ALPHA_WEBGLpixelstorageparameter. SeePixelStorageParametersforWebGL-specificpixelstorageparametersthataffectthebehaviorofthisfunctionwhenitiscalledwithanyargumenttypeotherthanImageBitmap. ThefirstpixeltransferredfromthesourcetotheWebGLimplementationcorrespondstotheupperleftcornerofthesource.ThisbehaviorismodifiedbytheUNPACK_FLIP_Y_WEBGLpixelstorageparameter,exceptforImageBitmaparguments,asdescribedintheabovementionedsection. Thecombinationofformat,type,andWebGLTexture'sinternalformatmustbelistedinthistable. IfanattemptismadetocallthisfunctionwithnoWebGLTexturebound(seeabove),generatesanINVALID_OPERATIONerror. IfaWebGLBufferisboundtothePIXEL_UNPACK_BUFFERtarget,generatesanINVALID_OPERATIONerror. IfthisfunctioniscalledwithanImageDatawhosedataattributehasbeenneutered,anINVALID_VALUEerrorisgenerated. IfthisfunctioniscalledwithanImageBitmapthathasbeenneutered,anINVALID_VALUEerrorisgenerated. IfthisfunctioniscalledwithanHTMLImageElementorHTMLVideoElementwhoseorigindiffersfromtheoriginofthecontainingDocument,orwithanHTMLCanvasElement,ImageBitmap,orOffscreenCanvaswhosebitmap'sorigin-cleanflagissettofalse,aSECURITY_ERRexceptionmustbethrown.SeeOriginRestrictions. voidtexSubImage3D(GLenumtarget,GLintlevel,GLintxoffset,GLintyoffset,GLintzoffset,GLsizeiwidth,GLsizeiheight,GLsizeidepth,GLenumformat,GLenumtype,GLintptroffset) (OpenGLES3.0.6§3.8.5, manpage) Updatesasub-rectangleofthecurrentlyboundWebGLTexturewithdatafromtheWebGLBufferboundtoPIXEL_UNPACK_BUFFERtarget. offsetisthebyteoffsetintotheWebGLBuffer'sdatastore;generatesanINVALID_VALUEerrorifit'slessthan0. IfanattemptismadetocallthefunctionwithnoWebGLTexturebound,generatesanINVALID_OPERATIONerror. IfnoWebGLBufferisboundtothePIXEL_UNPACK_BUFFERtarget,generatesanINVALID_OPERATIONerror. Ifpixelstoreparameterconstraintsarenotmet, generatesanINVALID_OPERATIONerror. voidcopyTexSubImage3D(GLenumtarget,GLintlevel,GLintxoffset,GLintyoffset,GLintzoffset,GLintx,GLinty,GLsizeiwidth,GLsizeiheight) (OpenGLES3.0.6§3.8.5, manpage) IfanattemptismadetocallthisfunctionwithnoWebGLTexturebound(seeabove),an INVALID_OPERATIONerrorisgenerated. Foranypixellyingoutsidetheframebuffer,thecorrespondingdestinationpixelremains untouched;seeReadingPixelsOutside theFramebuffer. Ifthisfunctionattemptstoreadfromamissingattachmentofacompleteframebuffer, anINVALID_OPERATIONerrorisgenerated perReadingfromaMissingAttachment. undefinedcompressedTexImage2D(GLenumtarget,GLintlevel,GLenuminternalformat, GLsizeiwidth,GLsizeiheight,GLintborder, [AllowShared]ArrayBufferViewsrcData, optionalGLuintsrcOffset=0, optionalGLuintsrcLengthOverride=0) (OpenGLES3.0.6§3.8.6, manpage) ReadingfromsrcDatabeginssrcOffsetelementsinto srcData.(ElementsarebytesforUint8Array,int32sforInt32Array,etc.) IfsrcOffset>srcData.length,generatesanINVALID_VALUEerror. srcLengthOverridedefaultstosrcData.length-srcOffset. Ifthere'snotenoughdatainsrcDatastartingatsrcOffset,or iftheamountofdatapassedinisnotconsistentwiththeformat,dimensions,and contentsofthecompressedimage,generatesanINVALID_VALUEerror. undefinedcompressedTexSubImage2D(GLenumtarget,GLintlevel,GLintxoffset,GLintyoffset, GLsizeiwidth,GLsizeiheight,GLenumformat, [AllowShared]ArrayBufferViewsrcData, optionalGLuintsrcOffset=0, optionalGLuintsrcLengthOverride=0) (OpenGLES3.0.6§3.8.6, manpage) ReadingfromsrcDatabeginssrcOffsetelementsinto srcData.(ElementsarebytesforUint8Array,int32sforInt32Array,etc.) IfsrcOffset>srcData.length,generatesanINVALID_VALUEerror. srcLengthOverridedefaultstosrcData.length-srcOffset. Ifthere'snotenoughdatainsrcDatastartingatsrcOffset,or iftheamountofdatapassedinisnotconsistentwiththeformat,dimensions,and contentsofthecompressedimage,generatesanINVALID_VALUEerror. undefinedcompressedTexImage3D(GLenumtarget,GLintlevel,GLenuminternalformat, GLsizeiwidth,GLsizeiheight,GLsizeidepth,GLintborder, [AllowShared]ArrayBufferViewsrcData, optionalGLuintsrcOffset=0, optionalGLuintsrcLengthOverride=0) (OpenGLES3.0.6§3.8.6, manpage) ReadingfromsrcDatabeginssrcOffsetelementsinto srcData.(ElementsarebytesforUint8Array,int32sforInt32Array,etc.) IfsrcOffset>srcData.length,generatesanINVALID_VALUEerror. srcLengthOverridedefaultstosrcData.length-srcOffset. Ifthere'snotenoughdatainsrcDatastartingatsrcOffset,or iftheamountofdatapassedinisnotconsistentwiththeformat,dimensions,and contentsofthecompressedimage,generatesanINVALID_VALUEerror. undefinedcompressedTexSubImage3D(GLenumtarget,GLintlevel,GLintxoffset,GLintyoffset, GLintzoffset,GLsizeiwidth,GLsizeiheight,GLsizeidepth, GLenumformat,[AllowShared]ArrayBufferViewsrcData, optionalGLuintsrcOffset=0, optionalGLuintsrcLengthOverride=0) (OpenGLES3.0.6§3.8.6, manpage) ReadingfromsrcDatabeginssrcOffsetelementsinto srcData.(ElementsarebytesforUint8Array,int32sforInt32Array,etc.) IfsrcOffset>srcData.length,generatesanINVALID_VALUEerror. srcLengthOverridedefaultstosrcData.length-srcOffset. Ifthere'snotenoughdatainsrcDatastartingatsrcOffset,or iftheamountofdatapassedinisnotconsistentwiththeformat,dimensions,and contentsofthecompressedimage,generatesanINVALID_VALUEerror. Thissectionappliestotheabovefourentrypoints. IfanattemptismadetocallthesefunctionswithnoWebGLTexturebound(seeabove),generatesanINVALID_OPERATIONerror. IfaWebGLBufferisboundtothePIXEL_UNPACK_BUFFERtarget,generatesanINVALID_OPERATIONerror. TheETC2andEACtextureformatsdefinedinOpenGLES3.0arenotavailableinWebGL2.0. voidcompressedTexImage2D(GLenumtarget,GLintlevel,GLenuminternalformat,GLsizeiwidth,GLsizeiheight,GLintborder,GLsizeiimageSize,GLintptroffset) (OpenGLES3.0.6§3.8.6, manpage) voidcompressedTexSubImage2D(GLenumtarget,GLintlevel,GLintxoffset,GLintyoffset,GLsizeiwidth,GLsizeiheight,GLenumformat,GLsizeiimageSize,GLintptroffset) (OpenGLES3.0.6§3.8.6, manpage) voidcompressedTexImage3D(GLenumtarget,GLintlevel,GLenuminternalformat,GLsizeiwidth,GLsizeiheight,GLsizeidepth,GLintborder,GLsizeiimageSize,GLintptroffset) (OpenGLES3.0.6§3.8.6, manpage) voidcompressedTexSubImage3D(GLenumtarget,GLintlevel,GLintxoffset,GLintyoffset,GLintzoffset,GLsizeiwidth,GLsizeiheight,GLsizeidepth,GLenumformat,GLsizeiimageSize,GLintptroffset) (OpenGLES3.0.6§3.8.6, manpage) Thissectionappliestotheabovefourentrypoints. IfanattemptismadetocallthesefunctionswithnoWebGLTexturebound(seeabove),generatesanINVALID_OPERATIONerror. IfnoWebGLBufferisboundtothePIXEL_UNPACK_BUFFERtarget,generatesanINVALID_OPERATIONerror. offsetisthebyteoffsetintotheWebGLBuffer'sdatastore;generatesanINVALID_VALUEerrorifit'slessthan0. TheETC2andEACtextureformatsdefinedinOpenGLES3.0arenotavailableinWebGL2.0. ProgramsandShaders [WebGLHandlesContextLoss]GLintgetFragDataLocation(WebGLProgramprogram,DOMStringname) (OpenGLES3.0.6§3.9.2.3, manpage) IfprogramwasgeneratedbyadifferentWebGL2RenderingContext thanthisone,generatesanINVALID_OPERATIONerrorandreturns-1. anygetProgramParameter(WebGLProgram?program,GLenumpname) (OpenGLES3.0.6§6.1.12, manpage) IfprogramwasgeneratedbyadifferentWebGL2RenderingContext thanthisone,generatesanINVALID_OPERATIONerrorandreturnsnull. Returnthevalueforthepassedpnamegiventhepassedprogram.Thetypereturnedisthenatural typefortherequestedpname,asgiveninthefollowingtable: pnamereturnedtype DELETE_STATUSGLboolean LINK_STATUSGLboolean VALIDATE_STATUSGLboolean ATTACHED_SHADERSGLint ACTIVE_ATTRIBUTESGLint ACTIVE_UNIFORMSGLint TRANSFORM_FEEDBACK_BUFFER_MODEGLenum TRANSFORM_FEEDBACK_VARYINGSGLint ACTIVE_UNIFORM_BLOCKSGLint Ifpnameisnotinthetableabove,generatesanINVALID_ENUMerrorandreturnsnull. ReturnsnullifanyOpenGLerrorsaregeneratedduringtheexecutionofthis function. Uniformsandattributes anygetUniform(WebGLProgramprogram,WebGLUniformLocationlocation) (OpenGLES3.0.6§6.1.12, manpage) Ifeitherprogramorlocationweregeneratedbya differentWebGL2RenderingContextthanthisone,generates anINVALID_OPERATIONerror. Returntheuniformvalueatthepassedlocationinthepassedprogram.Thetypereturnedisdependent ontheuniformtype.ThetypesreturnedforthenewuniformtypesinWebGL2.0aregiveninthe followingtable: uniformtypereturnedtype uintGLuint uvec2Uint32Array(with2elements) uvec3Uint32Array(with3elements) uvec4Uint32Array(with4elements) mat2x3Float32Array(with6elements) mat2x4Float32Array(with8elements) mat3x2Float32Array(with6elements) mat3x4Float32Array(with12elements) mat4x2Float32Array(with8elements) mat4x3Float32Array(with12elements) anysamplertypeGLint ThetypesreturnedfortheuniformtypessharedwithWebGL1.0arethesameasinWebGL1.0. voiduniform[1234]ui(WebGLUniformLocation?location,...) voiduniform[1234]uiv(WebGLUniformLocation?location,...) voiduniformMatrix[234]x[234]fv(WebGLUniformLocation?location,...) (OpenGLES3.0.6§2.12.6, manpage) Eachoftheuniform*functionsabovesetsthespecifieduniformoruniformstothevalues provided.Ifthepassedlocationisnotnullandwasnotobtainedfromthe currentlyusedprogramviaanearliercalltogetUniformLocation, anINVALID_OPERATIONerrorwillbegenerated.Ifthepassed locationisnull,thedatapassedinwillbesilentlyignoredandnouniform variableswillbechanged. Ifthearraypassedtoanyofthevectorforms(thoseendinginv)hasan invalidlength,anINVALID_VALUEerrorwillbegenerated.Thelengthisinvalid ifitistooshortfororisnotanintegermultipleoftheassignedtype. InoverloadswithasrcLengtharg: IfsrcLengthis0,itdefaultsto data.length-srcOffset. IfsrcOffset+srcLengthislongerthan data.length,generateINVALID_VALUE. voidvertexAttribI4[u]i(GLuintindex,...) voidvertexAttribI4[u]iv(GLuintindex,...) (OpenGLES3.0.6§2.8, manpage) Setsthevertexattributeatthepassedindextothegivenconstantintegervalue.Valuessetviathe vertexAttribareguaranteedtobereturnedfromthegetVertexAttribfunction withtheCURRENT_VERTEX_ATTRIBparam,eveniftherehavebeeninterveningcallsto drawArraysordrawElements. Ifthearraypassedtoanyofthevectorforms(thoseendinginv)istoo short,anINVALID_VALUEerrorwillbegenerated. voidvertexAttribIPointer(GLuintindex,GLintsize,GLenumtype,GLsizeistride,GLintptroffset) (OpenGLES3.0.6§2.9, manpage) AssigntheWebGLBufferobjectcurrentlyboundtotheARRAY_BUFFERtargettothevertex attributeatthepassedindex.Valuesarealwaysleftasintegervalues.Sizeisnumberof componentsperattribute.Strideandoffsetareinunitsofbytes.Passedstrideandoffset mustbeappropriateforthepassedtypeandsizeoranINVALID_OPERATIONerror willbegenerated;seeBufferOffset andStrideRequirements.Ifoffsetisnegative,anINVALID_VALUEerrorwill begenerated.IfnoWebGLBufferisboundtotheARRAY_BUFFERtargetandoffset isnon-zero,anINVALID_OPERATIONerrorwillbegenerated.InWebGL,the maximumsupportedstrideis255;seeVertex AttributeDataStride. anygetVertexAttrib(GLuintindex,GLenumpname) (OpenGLES3.0.6§6.1.12, manpage) Returntheinformationrequestedinpnameaboutthevertexattributeatthepassedindex.The typereturnedisdependentontheinformationrequested,asshowninthefollowingtable: pnamereturnedtype VERTEX_ATTRIB_ARRAY_BUFFER_BINDINGWebGLBuffer VERTEX_ATTRIB_ARRAY_ENABLEDGLboolean VERTEX_ATTRIB_ARRAY_SIZEGLint VERTEX_ATTRIB_ARRAY_STRIDEGLint VERTEX_ATTRIB_ARRAY_TYPEGLenum VERTEX_ATTRIB_ARRAY_NORMALIZEDGLboolean CURRENT_VERTEX_ATTRIBOneofFloat32Array,Int32ArrayorUint32Array(eachwith4elements) VERTEX_ATTRIB_ARRAY_INTEGERGLboolean VERTEX_ATTRIB_ARRAY_DIVISORGLint ForCURRENT_VERTEX_ATTRIB,thereturntypeisdictatedbythemostrecentcall tothevertexAttribfamilyoffunctionsforthegivenindex.Thatis,if vertexAttribI4i*wasused,thereturntypewillbeInt32Array;IfvertexAttribI4ui* wasused,thereturntypewillbeUint32Array;Otherwise,Float32Array. Allqueriesreturningsequencesortypedarraysreturnanewobjecteachtime. Ifpnameisnotinthetableabove,generatesanINVALID_ENUMerror. IfanOpenGLerrorisgenerated,returnsnull. Writingtothedrawingbuffer voidclear(GLbitfieldmask) (OpenGLES3.0.6§4.2.3, manpage) Clearbufferstopresetvalues.Ifanintegercolorbufferisamongthebuffersthatwouldbe cleared,anINVALID_OPERATIONerrorisgeneratedandnothingiscleared. voidvertexAttribDivisor(GLuintindex,GLuintdivisor) (OpenGLES3.0.6§2.9, manpage) Settherateatwhichthevertexattributeidentifiedbyindexadvanceswhendrawing. voiddrawArrays(GLenummode,GLintfirst,GLsizeicount) (OpenGLES3.0.6§2.9.3, manpage) voiddrawElements(GLenummode,GLsizeicount,GLenumtype,GLintptroffset) (OpenGLES3.0.6§2.9.3, manpage) voiddrawArraysInstanced(GLenummode,GLintfirst,GLsizeicount,GLsizeiinstanceCount) (OpenGLES3.0.6§2.9.3, manpage) DrawinstanceCountinstancesofgeometryusingthecurrentlyenabledvertexattributes. Vertexattributeswhichhaveanon-zerodivisoradvanceonceeverydivisorinstances. voiddrawElementsInstanced(GLenummode,GLsizeicount,GLenumtype,GLintptroffset,GLsizeiinstanceCount) (OpenGLES3.0.6§2.9.3, manpage) DrawinstanceCountinstancesofgeometryusingthecurrentlyboundelementarraybuffer. Vertexattributeswhichhaveanon-zerodivisoradvanceonceeverydivisorinstances. voiddrawRangeElements(GLenummode,GLuintstart,GLuintend,GLsizeicount,GLenumtype,GLintptroffset) (OpenGLES3.0.6§2.9.3, manpage) Drawusingthecurrentlyboundelementarraybuffer.Allerrorconditionsspecifiedfor drawElementsinthesectionWriting tothedrawingbufferoftheWebGL1.0specificationapply. Inaddition,ifindicesusedtodrawareoutsidetherangeof[start,end],animeplementation caneitherguaranteethebehaviorsdefinedinOut-of-Range ArrayAccesses,orsimplydiscardtheargumentsstartandendandcalldrawElements instead.Ineithersituation,noGLerrorsshouldbegeneratedforthiscause. DuringcallstodrawElements,drawArrays,drawRangeElementsandtheir instancedvariants,WebGL2.0performsadditionalerrorcheckingbeyondthatspecifiedinOpenGLES3.0: IftheCURRENT_PROGRAMisnull,anINVALID_OPERATIONerrorwillbegenerated; RangeChecking; ActiveUniformBlockBacking; VertexAttribfunctionmustmatchshaderattributetype. Readingbackpixels PixelsinthecurrentframebuffercanbereadbackintoanArrayBufferViewobjectora WebGLBufferboundtothePIXEL_PACK_BUFFERtarget. OnlydifferencesfromReadingbackpixelsinWebGL1.0aredescribedhere. undefinedreadPixels(GLintx,GLinty,GLsizeiwidth,GLsizeiheight,GLenumformat, GLenumtype,[AllowShared]ArrayBufferViewdstData,GLuintdstOffset) (OpenGLES3.0§4.3.2, manpage) IfaWebGLBufferisboundtothePIXEL_PACK_BUFFERtarget,generatesanINVALID_OPERATIONerror. Ifpixelstoreparameterconstraintsarenotmet, generatesanINVALID_OPERATIONerror. IfdstDatadoesn'thaveenoughspaceforthereadoperationstartingat dstOffset,generateINVALID_OPERATION. Thisisablockingoperation,asWebGLmustcompletelyfinishall previousrenderingoperationsintothesourceframebufferinorder toreturnaresult.Inmulti-processWebGLimplementations,italso incursanexpensiveinter-processround-triptofetchtheresult fromtheremoteprocess. ConsiderinsteadusingreadPixelsintoa PIXEL_PACK_BUFFER.UsegetBufferSubData toreadthedatafromthatbuffer. (SeegetBufferSubDataforhowtoavoidblockingin thatcall.) voidreadPixels(GLintx,GLinty,GLsizeiwidth,GLsizeiheight,GLenumformat,GLenumtype,GLintptroffset) (OpenGLES3.0§4.3.2, manpage) IfnoWebGLBufferisboundtothePIXEL_PACK_BUFFERtarget,generatesan INVALID_OPERATIONerror. offsetisthebyteoffsetintotheWebGLBuffer'sdatastore;generatesan INVALID_VALUEerrorifit'slessthan0.Iftheremainderofthe WebGLBuffer'sdatastoreisnotlargeenoughtoretrieveallofthepixelsinthe specifiedrectangletakingintoaccountpixelstoremodes,generatesan INVALID_OPERATION. Multiplerendertargets voiddrawBuffers(sequencebuffers) (OpenGLES3.0.6§4.2.1, manpage) Definethedrawbufferstowhichallfragmentcolorsarewritten. voidclearBufferfv(GLenumbuffer,GLintdrawbuffer,Float32Listvalues, optionalGLuintsrcOffset=0); voidclearBufferiv(GLenumbuffer,GLintdrawbuffer,Int32Listvalues, optionalGLuintsrcOffset=0); voidclearBufferuiv(GLenumbuffer,GLintdrawbuffer,Uint32Listvalues, optionalGLuintsrcOffset=0); voidclearBufferfi(GLenumbuffer,GLintdrawbuffer,GLfloatdepth,GLintstencil); (OpenGLES3.0.6§4.2.3, manpage) Seteverypixelinthespecifiedbuffertoaconstantvalue.TheclearBuffer functionthatshouldbeusedforacolorbufferdependsonthetypeofthecolorbuffer, giveninthefollowingtable: TypeofbufferclearBufferfunction floatingpointclearBufferfv fixedpointclearBufferfv signedintegerclearBufferiv unsignedintegerclearBufferuiv IfbufferisCOLOR_BUFFERandthefunctionisnotchosenaccordingtothe abovetable,anINVALID_OPERATIONerrorisgeneratedandnothingiscleared. ForArrayBufferViewentrypoints,ifthere'snotenoughelementsinvalues startingatsrcOffset,generateINVALID_VALUE. clearBufferfimaybeusedtoclearthedepthandstencilbuffers. buffermustbeDEPTH_STENCILanddrawBuffermustbe zero.depthandstencilarethedepthandstencilvalues, respectively. Ifthisfunctionattemptstoclearamissingattachmentofacompleteframebuffer,nothing isclearedandnoerrorisgenerated perDrawingtoaMissingAttachment. Queryobjects WebGLQuery?createQuery() (OpenGLES3.0.6§2.14, manpage) CreateaWebGLQueryobjectandinitializeitwithaqueryobjectnameasifbycallingglGenQueries. voiddeleteQuery(WebGLQuery?query) (OpenGLES3.0.6§2.14, manpage) IfquerywasgeneratedbyadifferentWebGL2RenderingContext thanthisone,generatesanINVALID_OPERATIONerror. Markfordeletionthequeryobjectcontainedinthepassed WebGLQuery,asifbycallingglDeleteQueries. Iftheobjecthasalreadybeenmarkedfordeletion,thecallhasnoeffect.Notethat underlyingGLobjectwillbeautomaticallymarkedfordeletionwhentheJSobjectis destroyed,howeverthismethodallowsauthorstomarkanobjectfordeletionearly. [WebGLHandlesContextLoss]GLbooleanisQuery(WebGLQuery?query) (OpenGLES3.0.6§6.1.7, manpage) ReturntrueifthepassedWebGLQueryisvalidandfalseotherwise. ReturnsfalseifthequerywasgeneratedbyadifferentWebGL2RenderingContext thanthisone. Returnsfalseifthequery'sinvalidated flagisset. voidbeginQuery(GLenumtarget,WebGLQueryquery) (OpenGLES3.0.6§2.14, manpage) IfquerywasgeneratedbyadifferentWebGL2RenderingContext thanthisone,generatesanINVALID_OPERATIONerror. Beginanasynchronousquery.Targetindicatesthetypeofquerytobeperformed. voidendQuery(GLenumtarget) (OpenGLES3.0.6§2.14, manpage) Marktheendofthesequenceofcommandstobetrackedforthequerytypegivenby target.Whenthefinalqueryresultisavailable,thequeryobjectisupdated toindicatethisandtheresultmayberetrievedbycallinggetQueryParameter. WebGLQuery?getQuery(GLenumtarget,GLenumpname) (OpenGLES3.0.6§6.1.7, manpage) Returnsinformationaboutaquerytargettarget,whichmustbeone ofANY_SAMPLES_PASSEDorANY_SAMPLES_PASSED_CONSERVATIVEfor occlusionqueries,orTRANSFORM_FEEDBACK_PRIMITIVES_WRITTENforprimitive queries.pnamespecifiesthesymbolicnameofaqueryobjecttarget parameter.CurrentlyitmustbeCURRENT_QUERY,andreturnseitherthe currentlyactivequeryforthetarget,ornull. Iftargetorpnamearenotinthelistabove,generates anINVALID_ENUMerrorandreturnsnull. ReturnsnullifanyOpenGLerrorsaregeneratedduringtheexecutionofthis function. anygetQueryParameter(WebGLQueryquery,GLenumpname) (OpenGLES3.0.6§6.1.7, manpage) IfquerywasgeneratedbyadifferentWebGL2RenderingContext thanthisone,generatesanINVALID_OPERATIONerror. Returnsaparameterpnameofaqueryobject.QUERY_RESULTreturns thevalueofthequeryobject'spassedsamplescounter. QUERY_RESULT_AVAILABLEreturnswhetherthesamplescounterisimmediately available.Thetypereturnedisthenaturaltypefortherequestedpname,asgiveninthe followingtable: pnamereturnedtype QUERY_RESULTGLuint QUERY_RESULT_AVAILABLEGLboolean Ifpnameisnotinthetableabove,generatesanINVALID_ENUM errorandreturnsnull. Ifqueryisnotavalidqueryobject,orisacurrentlyactivequeryobject, generatesanINVALID_OPERATIONerrorandreturnsnull. ReturnsnullifanyOpenGLerrorsaregeneratedduringtheexecutionofthis function. Inordertoensureconsistentbehavioracrossplatforms,queries'resultsmustonlybemade availablewhentheuseragent'sevent loopisnotexecutingatask.Inotherwords: Aquery'sresultmustnotbemadeavailableuntilcontrolhasreturnedtotheuser agent'smainloop. Repeatedlyfetchingaquery'sQUERY_RESULT_AVAILABLEparameterinaloop,without returningcontroltotheuseragent,mustalwaysreturnthesamevalue. Aquery'sresultmayormaynotbemadeavailablewhencontrolreturnstotheuser agent'seventloop.ItisnotguaranteedthatusingasinglesetTimeoutcallbackwitha delayof0,orasinglerequestAnimationFramecallback,willallowsufficienttimefor theWebGLimplementationtosupplythequery'sresults. ThischangecomparedtotheOpenGLES3.0specificationisenforcedinordertoprevent applicationsfromrelyingonbeingabletoissueaqueryandfetchitsresultinthe sameframe.Inordertoensurebestportabilityamongdevicesandbestperformanceamong implementations,applicationsmustexpectthatqueries'resultswillbecomeavailable asynchronously. Samplerobjects WebGLSampler?createSampler() (OpenGLES3.0.6§3.8.2, manpage) CreateaWebGLSamplerobjectandinitializeitwithasamplerobjectnameasifby callingglGenSamplers. voiddeleteSampler(WebGLSampler?sampler) (OpenGLES3.0.6§3.8.2, manpage) IfsamplerwasgeneratedbyadifferentWebGL2RenderingContext thanthisone,generatesanINVALID_OPERATIONerror. Markfordeletionthesamplerobjectcontainedinthepassed WebGLSampler,asifbycallingglDeleteSamplers. Iftheobjecthasalreadybeenmarkedfordeletion,thecallhasnoeffect.Notethat underlyingGLobjectwillbeautomaticallymarkedfordeletionwhentheJSobjectis destroyed,howeverthismethodallowsauthorstomarkanobjectfordeletionearly. [WebGLHandlesContextLoss]GLbooleanisSampler(WebGLSampler?sampler) (OpenGLES3.0.6§6.1.5, manpage) ReturntrueifthepassedWebGLSamplerisvalidandfalseotherwise. Returnsfalseifthesamplerwasgeneratedbya differentWebGL2RenderingContextthanthisone. Returnsfalseifthesampler'sinvalidated flagisset. voidbindSampler(GLuintunit,WebGLSampler?sampler) (OpenGLES3.0.6§3.8.2, manpage) IfsamplerwasgeneratedbyadifferentWebGL2RenderingContext thanthisone,generatesanINVALID_OPERATIONerror. BindthesamplerobjectcontainedinthepassedWebGLSamplertothetextureunitatthe passedindex.Ifasamplerisboundtoatextureunit,thesampler'sstatesupersedesthesampling stateofthetextureboundtothattextureunit.Ifsamplerisnull,the currentlyboundsamplerisunboundfromthetextureunit.Asinglesamplerobjectmaybeboundto multipletextureunitssimultaneously. IfunitisgreaterthanorequaltothevalueofMAX_COMBINED_TEXTURE_IMAGE_UNITS,generatesanINVALID_VALUEerror. Anattempttobindanobjectmarkedfordeletionwillgeneratean INVALID_OPERATIONerror,andthecurrentbindingwillremainuntouched. voidsamplerParameteri(WebGLSamplersampler,GLenumpname,GLintparam) voidsamplerParameterf(WebGLSamplersampler,GLenumpname,GLfloatparam) (OpenGLES3.0.6§3.8.2, manpage) IfsamplerwasgeneratedbyadifferentWebGL2RenderingContext thanthisone,generatesanINVALID_OPERATIONerror. Setthevalueforthepassedpnamegiventhepassedsampler.pnameisgiveninthefollowingtable: pname TEXTURE_COMPARE_FUNC TEXTURE_COMPARE_MODE TEXTURE_MAG_FILTER TEXTURE_MAX_LOD TEXTURE_MIN_FILTER TEXTURE_MIN_LOD TEXTURE_WRAP_R TEXTURE_WRAP_S TEXTURE_WRAP_T Ifpnameisnotinthetableabove,generatesanINVALID_ENUMerror. Ifsamplerisnotavalidsamplerobject,generatesanINVALID_OPERATIONerror. anygetSamplerParameter(WebGLSamplersampler,GLenumpname) (OpenGLES3.0.6§6.1.5, manpage) IfsamplerwasgeneratedbyadifferentWebGL2RenderingContext thanthisone,generatesanINVALID_OPERATIONerror. ReturntheinformationrequestedinpnameaboutthegivenWebGLSampler,passedassampler.The typereturnedisdependentontheinformationrequested,asshowninthefollowingtable: pnamereturnedtype TEXTURE_COMPARE_FUNCGLenum TEXTURE_COMPARE_MODEGLenum TEXTURE_MAG_FILTERGLenum TEXTURE_MAX_LODGLfloat TEXTURE_MIN_FILTERGLenum TEXTURE_MIN_LODGLfloat TEXTURE_WRAP_RGLenum TEXTURE_WRAP_SGLenum TEXTURE_WRAP_TGLenum Ifpnameisnotinthetableabove,generatesanINVALID_ENUMerror. Ifsamplerisnotavalidsamplerobject,generatesanINVALID_OPERATIONerror. ReturnsnullifanyOpenGLerrorsaregeneratedduringtheexecutionofthisfunction. Syncobjects SyncobjectscanbeusedtosynchronizeexecutionbetweentheGLserverandtheclient. WebGLSync?fenceSync(GLenumcondition,GLbitfieldflags) (OpenGLES3.0.6§5.2, manpage) CreateanewfencesyncobjectandinsertanassociatedfencecommandintheGLcommandstream. [WebGLHandlesContextLoss]GLbooleanisSync(WebGLSync?sync) (OpenGLES3.0.6§6.1.8, manpage) ReturntrueifthepassedWebGLSyncisvalidandfalseotherwise. ReturnsfalseifthesyncwasgeneratedbyadifferentWebGL2RenderingContext thanthisone. Returnsfalseifthesync'sinvalidated flagisset. voiddeleteSync(WebGLSync?sync) (OpenGLES3.0.6§5.2, manpage) IfsyncwasgeneratedbyadifferentWebGL2RenderingContext thanthisone,generatesanINVALID_OPERATIONerror. Markfordeletionthesyncobjectcontainedinthepassed WebGLSync,asifbycallingglDeleteSync. Iftheobjecthasalreadybeenmarkedfordeletion,thecallhasnoeffect.Notethat underlyingGLobjectwillbeautomaticallymarkedfordeletionwhentheJSobjectis destroyed,howeverthismethodallowsauthorstomarkanobjectfordeletionearly. GLenumclientWaitSync(WebGLSyncsync,GLbitfieldflags,GLuint64timeout) (OpenGLES3.0.6§5.2.1, manpage) IfsyncwasgeneratedbyadifferentWebGL2RenderingContext thanthisone,generatesanINVALID_OPERATIONerror. Blockexecutionuntilthepassedsyncobjectissignaledorthespecifiedtimeouthas passed.timeoutisinunitsofnanoseconds. Returnsoneoffourstatusvalues.AreturnvalueofALREADY_SIGNALEDindicates thatsyncwassignaledatthetimeclientWaitSyncwas called.ALREADY_SIGNALEDwillalwaysbereturnedifsyncwassignaled,even iftimeoutwaszero.AreturnvalueofTIMEOUT_EXPIREDindicatesthatthespecified timeoutperiodexpiredbeforesyncwassignaled.AreturnvalueofCONDITION_SATISFIED indicatesthatsyncwassignaledbeforethetimeoutexpired.Finally,ifanerroroccurs,in additiontogeneratinganerrorasspecifiedbelow,returnsWAIT_FAILEDwithoutblocking. flagscontrolscommandflushingbehaviorandmayincludeSYNC_FLUSH_COMMANDS_BIT.If anyotherbitissetinflagsanINVALID_OPERATIONerroris generated.IfSYNC_FLUSH_COMMANDS_BITissetinflagsandsyncis unsignaledwhenclientWaitSynciscalled,thentheequivalentofflushwillbe performedbeforeblockingonsync. Asdiscussedinthedifferencessection,WebGLimplementationsmustimposea shortmaximumtimeouttopreventblockingthemainthreadforlongperiodsoftime.The implementation-definedtimeoutmaybequeriedbycallinggetParameterwiththe argumentMAX_CLIENT_WAIT_TIMEOUT_WEBGL.Iftimeoutislargerthanthis implementation-definedtimeoutthenanINVALID_OPERATIONerrorisgenerated. Theimplementation-definedmaximumtimeoutisnotspecified.Itshouldbesetlowenoughtokeepapplications fromcompromisinginteractivitybywaitingforlongperiodsoftime.Itisacceptableforanimplementationto imposeazeromaximumtimeout.WebGLapplicationsshouldnotuseclientWaitSynctoblockexecutionforlong periodsoftime. ReturnsWAIT_FAILEDifanyOpenGLerrorsaregeneratedduringtheexecutionofthis function. Inordertoensureconsistentbehavioracrossplatforms,syncobjectsmayonlytransition tothesignaledstatewhentheuser agent'sevent loopisnotexecutingatask.Inotherwords: clientWaitSyncmustnotreturnCONDITION_SATISFIEDorALREADY_SIGNALEDforanewly createdsyncobjectuntilcontrolhasreturnedtotheuseragent'smainloop. voidwaitSync(WebGLSyncsync,GLbitfieldflags,GLint64timeout) (OpenGLES3.0.6§5.2.1, manpage) IfsyncwasgeneratedbyadifferentWebGL2RenderingContext thanthisone,generatesanINVALID_OPERATIONerror. Returnimmediately,butwaitontheGLserveruntilthepassedsyncobjectissignaledoran implementation-dependenttimeouthaspassed.Thepassedtimeoutmustbesetto TIMEOUT_IGNORED. IntheabsenceofthepossibilityofsynchronizingbetweenmultipleGLcontexts,callingwaitSynciseffectivelyano-op. anygetSyncParameter(WebGLSyncsync,GLenumpname) (OpenGLES3.0.6§6.1.8, manpage) IfsyncwasgeneratedbyadifferentWebGL2RenderingContext thanthisone,generatesanINVALID_OPERATIONerror. ReturnthevalueforthepassedpnamegiventhepassedWebGLSyncobject.Thetypereturnedisthenatural typefortherequestedpname,asgiveninthefollowingtable: pnamereturnedtype OBJECT_TYPEGLenum SYNC_STATUSGLenum SYNC_CONDITIONGLenum SYNC_FLAGSGLbitfield Ifpnameisnotinthetableabove,generatesanINVALID_ENUMerrorandreturnsnull. ReturnsnullifanyOpenGLerrorsaregeneratedduringtheexecutionofthis function. Inordertoensureconsistentbehavioracrossplatforms,syncobjectsmayonly transitiontothesignaledstatewhentheuseragent'sevent loopisnotexecutingatask.Inotherwords: Asyncobjectmustnotbecomesignaleduntilcontrolhasreturnedtotheuser agent'smainloop. Repeatedlyfetchingasyncobject'sSYNC_STATUSparameterinaloop,without returningcontroltotheuseragent,mustalwaysreturnthesamevalue. Transformfeedback Transformfeedbackmodecapturesthevaluesofoutputvariableswrittenbythevertexshader.The verticesarecapturedbeforeflatshadingandclipping.Thetransformedverticesmaybeoptionally discardedafterbeingstoredintooneormorebufferobjects,ortheycanbepassedondowntothe clippingstageforfurtherprocessing.Thesetofoutputvariablescapturedisdeterminedwhena programislinked. Ifanyoutputvariableisspecifiedtobestreamedtoatransformfeedbackbufferobjectbutnotactually writtenbyavertexshader,thevalueissetto0.See Transformfeedbackprimitivecapture. WebGLTransformFeedback?createTransformFeedback() (OpenGLES3.0.6§2.15.1, similartoglGenTransformFeedbacks) CreateaWebGLTransformFeedbackobjectandinitializeitwithatransformfeedbackobjectnameasifby callingglGenTransformFeedbacks. voiddeleteTransformFeedback(WebGLTransformFeedback?transformFeedback) (OpenGLES3.0.6§2.15.1, similartoglDeleteTransformFeedbacks) IftransformFeedbackwasgeneratedbyadifferentWebGL2RenderingContext thanthisone,generatesanINVALID_OPERATIONerror. Markfordeletionthetransformfeedbackobjectcontainedinthepassed WebGLTransformFeedback,asifbycalling glDeleteTransformFeedbacks. Iftheobjecthasalreadybeenmarkedfordeletion,thecallhasnoeffect.Notethat underlyingGLobjectwillbeautomaticallymarkedfordeletionwhentheJSobjectis destroyed,howeverthismethodallowsauthorstomarkanobjectfordeletionearly. [WebGLHandlesContextLoss]GLbooleanisTransformFeedback(WebGLTransformFeedback?transformFeedback) (OpenGLES3.0.6§6.1.11, manpage) ReturntrueifthepassedWebGLTransformFeedbackisvalidandfalseotherwise. Returnsfalseifthetransformfeedbackwasgeneratedbya differentWebGL2RenderingContextthanthisone. Returnsfalseifthetransformfeedback'sinvalidated flagisset. voidbindTransformFeedback(GLenumtarget,WebGLTransformFeedback?transformFeedback) (OpenGLES3.0.6§2.15.1, manpage) IftransformFeedbackwasgeneratedbya differentWebGL2RenderingContextthanthisone,generates anINVALID_OPERATIONerror. BindthegivenWebGLTransformFeedbackobject. IftransformFeedbackisnull,thedefaulttransformfeedbackobjectprovidedbythecontext isbound. Anattempttobindanobjectmarkedfordeletionwillgeneratean INVALID_OPERATIONerror,andthecurrentbindingwillremainuntouched. voidbeginTransformFeedback(GLenumprimitiveMode) (OpenGLES3.0.6§2.15.2, manpage) voidendTransformFeedback() (OpenGLES3.0.6§2.15.2, manpage) voidpauseTransformFeedback() (OpenGLES3.0.6§2.15.2, manpage) voidresumeTransformFeedback() (OpenGLES3.0.6§2.15.2, manpage) voidtransformFeedbackVaryings(WebGLProgramprogram,sequencevaryings,GLenumbufferMode) (OpenGLES3.0.6§2.12.8, manpage) IfprogramwasgeneratedbyadifferentWebGL2RenderingContext thanthisone,generatesanINVALID_OPERATIONerror. WebGLActiveInfo?getTransformFeedbackVarying(WebGLProgramprogram,GLuintindex) (OpenGLES3.0.6§2.12.8, manpage) IfprogramwasgeneratedbyadifferentWebGL2RenderingContext thanthisone,generatesanINVALID_OPERATIONerrorandreturnsnull. UniformBufferobjects Uniformbufferobjectsprovidethestoragefornameduniformblocks,sothevaluesofactiveuniforms innameduniformblocksmaybechangedbymodifyingthecontentsofthebufferobject. voidbindBufferBase(GLenumtarget,GLuintindex,WebGLBuffer?buffer) (OpenGLES3.0.6§2.10.1.1, manpage) IfbufferwasgeneratedbyadifferentWebGL2RenderingContext thanthisone,generatesanINVALID_OPERATIONerror. BindsthegivenWebGLBufferobjecttothebindingpointatindexofthearrayoftargets specifiedbytarget. voidbindBufferRange(GLenumtarget,GLuintindex,WebGLBuffer?buffer,GLintptroffset,GLsizeiptrsize) (OpenGLES3.0.6§2.10.1.1, manpage) IfbufferwasgeneratedbyadifferentWebGL2RenderingContext thanthisone,generatesanINVALID_OPERATIONerror. BindsarangeoftheWebGLBufferobjectbufferrepresentedbyoffsetandsize tothebindingpointatindexofthearrayoftargetsspecifiedbytarget. sequence?getUniformIndices(WebGLProgramprogram,sequenceuniformNames) (OpenGLES3.0.6§2.12.6, manpage) Ifprogramwasgeneratedbyadifferent WebGL2RenderingContextthanthisone,generates anINVALID_OPERATIONerror. Retrievestheindicesofanumberofuniformswithinprogram. ReturnsnullifanyOpenGLerrorsaregeneratedduringtheexecutionofthis function. anygetActiveUniforms(WebGLProgramprogram,sequenceuniformIndices,GLenumpname) (OpenGLES3.0.6§2.12.6, manpage) IfprogramwasgeneratedbyadifferentWebGL2RenderingContext thanthisone,generatesanINVALID_OPERATIONerror. Queriesthevalueoftheparameternamedpnameforeachoftheuniformswithinprogramwhoseindices arespecifiedinthearrayofuniformIndices.Thetypereturnedisthenaturaltypefortherequested pname,asgiveninthefollowingtable: pnamereturnedtype UNIFORM_TYPEsequence UNIFORM_SIZEsequence UNIFORM_BLOCK_INDEXsequence UNIFORM_OFFSETsequence UNIFORM_ARRAY_STRIDEsequence UNIFORM_MATRIX_STRIDEsequence UNIFORM_IS_ROW_MAJORsequence Ifpnameisnotinthetableabove,generatesanINVALID_ENUMerror. ReturnsnullifanyOpenGLerrorsaregeneratedduringtheexecutionofthis function. GLuintgetUniformBlockIndex(WebGLProgramprogram,DOMStringuniformBlockName) (OpenGLES3.0.6§2.12.6, manpage) IfprogramwasgeneratedbyadifferentWebGL2RenderingContext thanthisone,generatesanINVALID_OPERATIONerror. Retrievestheindexofauniformblockwithinprogram. anygetActiveUniformBlockParameter(WebGLProgramprogram,GLuintuniformBlockIndex,GLenumpname) (OpenGLES3.0.6§2.12.6, manpage) IfprogramwasgeneratedbyadifferentWebGL2RenderingContext thanthisone,generatesanINVALID_OPERATIONerror. Retrievesinformationaboutanactiveuniformblockwithinprogram.Thetypereturnedisthenaturaltypefortherequested pname,asgiveninthefollowingtable: pnamereturnedtype UNIFORM_BLOCK_BINDINGGLuint UNIFORM_BLOCK_DATA_SIZEGLuint UNIFORM_BLOCK_ACTIVE_UNIFORMSGLuint UNIFORM_BLOCK_ACTIVE_UNIFORM_INDICESUint32Array UNIFORM_BLOCK_REFERENCED_BY_VERTEX_SHADERGLboolean UNIFORM_BLOCK_REFERENCED_BY_FRAGMENT_SHADERGLboolean Ifpnameisnotinthetableabove,generatesanINVALID_ENUMerror. IfuniformBlockIndexisnotanactiveblockuniformforprogramorgreaterthanorequaltothe valueofACTIVE_UNIFORM_BLOCKS,generatesanINVALID_VALUEerror. IfanOpenGLerrorisgenerated,returnsnull. DOMString?getActiveUniformBlockName(WebGLProgramprogram,GLuintuniformBlockIndex) (OpenGLES3.0.6§2.12.6, manpage) IfprogramwasgeneratedbyadifferentWebGL2RenderingContext thanthisone,generatesanINVALID_OPERATIONerror. RetrievesthenameoftheactiveuniformblockatuniformBlockIndexwithinprogram. voiduniformBlockBinding(WebGLProgramprogram,GLuintuniformBlockIndex,GLuintuniformBlockBinding) (OpenGLES3.0.6§2.12.6.5, manpage) IfprogramwasgeneratedbyadifferentWebGL2RenderingContext thanthisone,generatesanINVALID_OPERATIONerror. Assignsbindingpointsforactiveuniformblocks. VertexArrayobjects VertexArrayobjects(sometimesreferredtoasVAOs)encapsulateallstaterelatedtothe definitionofdatausedbythevertexprocessor. voidbindVertexArray(WebGLVertexArrayObject?vertexArray) (OpenGLES3.0.6§2.11, manpage) IfvertexArraywasgeneratedbya differentWebGL2RenderingContextthanthisone,generates anINVALID_OPERATIONerror. BindthegivenWebGLVertexArrayObjectobject. IfvertexArrayisnull,thedefaultvertexarrayprovidedbythecontext isbound. AnattempttobindadeletedvertexarraywillgenerateaINVALID_OPERATIONerror,and thecurrentbindingwillremainuntouched. WebGLVertexArrayObject?createVertexArray() (OpenGLES3.0.6§2.11, similartoglGenVertexArrays) CreateaWebGLVertexArrayObjectobjectandinitializeitwithavertexarrayobjectnameasifby callingglGenVertexArrays. voiddeleteVertexArray(WebGLVertexArrayObject?vertexArray) (OpenGLES3.0.6§2.11, similartoglDeleteVertexArrays) IfvertexArraywasgeneratedbya differentWebGL2RenderingContextthanthisone,generates anINVALID_OPERATIONerror. Markfordeletionthevertexarrayobjectcontainedinthepassed WebGLVertexArrayObject,asifbycalling glDeleteVertexArrays. Iftheobjecthasalreadybeenmarkedfordeletion,thecallhasnoeffect.Notethat underlyingGLobjectwillbeautomaticallymarkedfordeletionwhentheJSobjectis destroyed,howeverthismethodallowsauthorstomarkanobjectfordeletionearly. [WebGLHandlesContextLoss]GLbooleanisVertexArray(WebGLVertexArrayObject?vertexArray) (OpenGLES3.0.6§6.1.10, manpage) ReturntrueifthepassedWebGLVertexArrayObjectisvalidandfalseotherwise. ReturnsfalseifthevertexarraywasgeneratedbyadifferentWebGL2RenderingContext thanthisone. Returnsfalseifthevertexarray'sinvalidated flagisset. OtherdifferencesBetweenWebGL2.0andWebGL1.0 NeedsupdateforWebGL2.0 BackwardsIncompatibility Errors TheWebGL2.0APImaybehavedifferentlyincaseswheretheWebGL1.0APIgeneratesanerror. CodewrittenagainsttheWebGL1.0APIthatgenerateserrorsisnotguaranteedtobe forward-compatiblewithWebGL2.0. Extensions SomeextensionsthatmayhavebeensupportedintheWebGL1.0APIareremovedfromtheWebGL 2.0API.Formoredetails,seethe WebGLExtensionRegistry. ExtensionsaretypicallyremovedonlyifequivalentfunctionalityisavailableintheWebGL 2.0APIeitherinthecorespecificationorinanimprovedextension.Whenanapplication usingWebGL1.0extensionsismodifiedtorunontheWebGL2.0API,itisoftenpossibleto createadummyextensionobjectforeachofthepromotedextensionswhichsimply redirectscallstotheappropriateWebGL2.0APIfunctions.Iftheapplicationisusingshader languageextensions,portingshaderstoGLSLES3.00istypicallyrequired. Non-Power-of-TwoTextureAccess TextureaccessworksintheWebGL2.0APIasintheOpenGLES3.0API.Inotherwords, unliketheWebGL1.0API,therearenospecialrestrictionsonnonpowerof2textures.All mipmappingandallwrappingmodesaresupportedfornon-power-of-twoimages. PrimitiveRestartisAlwaysEnabled SeesectionPRIMITIVE_RESTART_FIXED_INDEXisalwaysenabled. FramebufferObjectAttachments InWebGL1.0,DEPTH_STENCIL_ATTACHMENTisanalternativeattachmentpointotherthanDEPTH_ATTACHMENTandSTENCIL_ATTACHMENT.InWebGL2.0,however,DEPTH_STENCIL_ATTACHMENTisconsideredanaliasforDEPTH_ATTACHMENT+STENCIL_ATTACHMENT,i.e.,thesameimageisattachedtobothDEPTH_ATTACHMENTandSTENCIL_ATTACHMENT,overwritingtheoriginalimagesattachedtothetwoattachmentpoints. Considerthefollowingsequenceofactions: attachrenderbuffer1toDEPTH_ATTACHMENT; attachrenderbuffer2toDEPTH_STENCIL_ATTACHMENT; attachnulltoDEPTH_STENCIL_ATTACHMENT. InWebGL1.0,theframebufferendsupwithrenderbuffer1attachedtoDEPTH_ATTACHMENTandnoimageattachedtoSTENCIL_ATTACHMENT;inWebGL2.0,however,neitherDEPTH_ATTACHMENTnorSTENCIL_ATTACHMENThasanimageattached. TheconstraintsdefinedinFramebufferObjectAttachmentsnolongerapplyinWebGL2.0. Ifdifferentimagesareboundtothedepthandstencilattachmentpoints,checkFramebufferStatusreturnsFRAMEBUFFER_UNSUPPORTED,andgetFramebufferAttachmentParameterwithattachmentofDEPTH_STENCIL_ATTACHMENTgeneratesanINVALID_OPERATIONerror. TextureTypeinTexSubImage2DCalls IntheWebGL1.0API,thetypeargumentpassedtotexSubImage2Dmust matchthetypeusedtooriginallydefinethetextureobject(i.e.,usingtexImage2D). IntheWebGL2.0API,thisrestrictionhasbeenlifted. Out-of-boundsBehaviorsincopyTexSubImage2DandreadPixelscalls InWebGL1.0, ReadingPixelsOutsidetheFramebuffer,itisrequiredthat copyTexSubImage2DandreadPixelsdonottouch thecorrespondingdestinationrangeforout-of-boundpixels. InWebGL2.0,whenaPACK_BUFFERobjectisboundand PACK_ROW_LENGTHisnotzeroandlessthanwidth, orwhenaUNPACK_BUFFERobjectisboundand UNPACK_ROW_LENGTHisnotzeroandlessthanwidth orUNPACK_IMAGE_HEIGHTisnotzeroandlessthanheight, packing/unpackingarow/imagemayextendtothenextrow/image.Ifthat portionisout-of-bounds,thevaluesmaychangeaccordingly. ColorconversionincopyTex{Sub}Image2D InWebGL1.0(OpenGLES2.0),itisallowedforthecomponentsizesof internalformattobelessthanthecorrespondingcomponentsizes ofthesourcebuffer'sinternalformat.However,inWebGL2.0(OpenGLES3.0), ifinternalformatissized,itscomponentsizesmustexactly matchthecorrespondingcomponentsizesofthesourcebuffer'seffective internalformat. InbothWebGL1.0and2.0,sourcebuffercomponentscanbedroppedduringthe conversiontointernalformat,butnewcomponentscannotbeadded. getFramebufferAttachmentParameterwithFRAMEBUFFER_ATTACHMENT_OBJECT_NAME IfgetFramebufferAttachmentParameteriscalledwithpname FRAMEBUFFER_ATTACHMENT_OBJECT_NAMEandattachmenthasno imageattached,inWebGL1.0/ES2.0,itgeneratesanINVALID_OPERATION; inWebGL2.0/ES3.0,itgeneratesnoerrorandnullisreturned. NewFeaturesSupportedintheWebGL2.0API Pixelbufferobjects(OpenGLES3.0.6§3.7.1andOpenGLES3.0.6§4.3) Primitiverestart(OpenGLES3.0.6§2.9.1) Rasterizerdiscard(OpenGLES3.0.6§3.1) GLSLES3.00support InadditiontosupportingTheOpenGLESShadingLanguage,Version1.00,theWebGL2.0APIalsoaccepts shaderswritteninTheOpenGLESShadingLanguage,Version3.00 [GLES30GLSL],withsomerestrictions. AshaderreferencingstatevariablesorfunctionsthatareavailableinotherversionsofGLSL, suchasthatfoundinversionsofOpenGLforthedesktop,mustnotbeallowedtoload. AsintheWebGL1.0API,identifiersstartingwith"webgl_"and"_webgl_"arereservedforuseby WebGL.Ashaderwhichdeclaresafunction,variable,structurename,orstructurefieldstartingwith theseprefixesmustnotbeallowedtoload. MaximumGLSLTokenSize WebGL1.0supportstokensupto256charactersinlength.WebGL2.0followsTheOpenGLESShadingLanguage,Version3.00 (OpenGLES3.0.6§1.5.1) andallowstokensupto1024charactersinlengthforbothESSL1andESSL3shaders.Shaderscontainingtokenslongerthan1024charactersmustfailtocompile. MaximumUniformandAttributeLocationLengths WebGL2.0imposesalimitof1024charactersonthelengthsofuniformandattributelocations. VertexAttributeDivisor IntheWebGL2.0API,vertexattributeswhichhaveanon-zerodivisordonotadvanceduringcallsto drawArraysanddrawElements. (OpenGLES3.0.6§2.9.3) DifferencesBetweenWebGLandOpenGLES3.0 ThissectiondescribeschangesmadetotheWebGLAPIrelativetothe OpenGLES3.0APItoimproveportabilityacrossvariousoperating systemsanddevices. BufferObjectBinding WebGLbuffertype Bindingpointsthatsetthistype undefined none elementarray ELEMENT_ARRAY_BUFFER otherdata allbindingpointsexceptELEMENT_ARRAY_BUFFER,COPY_READ_BUFFERandCOPY_WRITE_BUFFER IntheWebGL2.0API,buffershavetheirWebGLbuffertypeinitiallysettoundefined.Calling bindBuffer,bindBufferRangeorbindBufferBasewiththe targetargumentsettoanybufferbindingpointexceptCOPY_READ_BUFFERor COPY_WRITE_BUFFERwillthensettheWebGLbuffertypeofthebufferbeingbound accordingtothetableabove.Bindingabufferwithtypeundefinedto theCOPY_READ_BUFFERorCOPY_WRITE_BUFFERbindingpointswillset itstypetootherdata. Anycalltooneofthesefunctionswhichattemptstobindadeletedbufferwillgeneratea INVALID_OPERATIONerror,andthebindingwillremainuntouched. AnycalltooneofthesefunctionswhichattemptstobindaWebGLBufferthathastheelement arrayWebGLbuffertypetoabindingpointthatfallsunderotherdata,orbinda WebGLBufferwhichhastheotherdataWebGLbuffertypetoELEMENT_ARRAY_BUFFER willgenerateanINVALID_OPERATIONerror,andthestateofthebindingpointwillremain untouched. Thisrestrictionimpliesthatagivenbufferobjectmaycontaineitherindicesorotherdata,but notboth. Theserestrictionsaresimilartobufferobjectbinding restrictionsintheWebGL1.0specification. ThisrestrictionhasbeenaddedtopreventwritingtoindexbuffersontheGPU,whichwouldmake doinganyCPU-sidechecksonindexdataprohibitivelyexpensive.Handlingindexbuffersasdifferent fromotherbufferdataalsomapsbettertotheDirect3DAPI. CopyingBuffers AttemptingtousecopyBufferSubDatatocopybetweenbuffersthathave elementarrayandotherdataWebGLbuffertypesasspecifiedinsection BufferObjectBindinggeneratesan INVALID_OPERATIONerrorandnocopyingisperformed. SameaswithBufferObjectBindingrestrictionsabove. PreventingundefinedbehaviorwithTransformFeedback AbufferwhichissimultaneouslyboundtoaTRANSFORM_FEEDBACK_BUFFERbindingpointinthecurrently boundtransformfeedbackobjectandanyotherbindingpointintheWebGLAPIcannotbeused.Any attempteduseofsuchadoubleboundbufferfailswithanINVALID_OPERATIONerror, regardlessofwhethertransformfeedbackisenabled.Forexample,readPixelstoaPIXEL_PACK_BUFFER willfailifthebufferisalsoboundtothecurrenttransformfeedbackobject. Ifanerrorwerenotgenerated,thevaluesreadorwrittenwouldbeundefined. ( OpenGLES3.0.6§2.15.2) Incasethesamebufferisboundtomorethanonebindingpointintheactivetransformfeedback, beginTransformFeedbackgeneratesanINVALID_OPERATIONerror. ThiscanhappenonlyinSEPARATE_ATTRIBSmode. ThisisarestrictionfromD3D11,wherewritingtwodifferentstreamstothesamebufferisnot allowed. DrawBuffers ThevalueoftheMAX_COLOR_ATTACHMENTSparametermustbeequaltothatoftheMAX_DRAW_BUFFERS parameter. Thereisnousecasefortheseparametersbeingdifferent. IfanESSL1fragmentshaderwritestoneithergl_FragColornorgl_FragData, thevaluesofthefragmentcolorsfollowingshaderexecutionareuntouched.Ifcorrespondingoutput variablesarenotdefinedinanESSL3fragmentshader,thevaluesofthefragmentcolorsfollowing shaderexecutionareuntouched. Alluser-definedoutputvariablesdefaulttozeroiftheyarenotwrittenduringashaderexecution. Foroptimalperformance,anoutputarrayshouldnotincludeanyelementsthatarenotaccessed. Ifthevalueswrittenbythefragmentshaderdonotmatchtheformat(s)ofthecorresponding colorbuffer(s)(forexample,theoutputvariableisaninteger,butthecorrespondingcolor bufferhasafloating-pointformat,orviceversa),andthecolorbufferstatesarenotsetto NONEbyDrawBuffers,drawsgenerateanINVALID_OPERATIONerror; ifthecolorbufferstatesaresettoNONEbyDrawBuffers,theyremainuntouched. Ifanydrawbufferwithanattachmentdoesnothaveadefinedfragmentshaderoutput,draws generateINVALID_OPERATION,unlessall4channelsofcolorMaskaresettofalse. NoProgramBinaries AccessingbinaryrepresentationsofcompiledshaderprogramsisnotsupportedintheWebGL2.0API. ThisincludesOpenGLES3.0GetProgramBinary,ProgramBinary,and ProgramParameterientrypoints.Inaddition,queryingtheprogrambinarylengthwith getProgramParameter,andqueryingprogrambinaryformatswithgetParameter arenotsupportedintheWebGL2.0API. RangeChecking InadditiontotherangecheckingspecifiedintheWebGL1.0specificationsection EnabledVertexAttributesandRangeChecking, indicesreferencedbydrawElements,drawRangeElementsor drawElementsInstancedthataregreaterthantheMAX_ELEMENT_INDEXparameter causethedrawcalltogenerateanINVALID_OPERATIONerroreveniftheyliewithinthe storageoftheboundbuffer.Rangecheckingisnotperformedforindicesthattriggerprimitive restartifprimitiverestartisenabled.TherangecheckingspecifiedfordrawArraysin theWebGL1.0APIisalsoappliedtodrawArraysInstancedintheWebGL2.0API. TheOpenGLrobustnessextensionsdonotspecifywhathappensifindicesaboveMAX_ELEMENT_INDEXare used,sopassingthemtothedriverisrisky.OnplatformswhereMAX_ELEMENT_INDEXisthesameas themaximumunsignedintegervaluethissectionwillhavenoeffect. ActiveUniformBlockBacking IntheWebGL2.0API,attemptingtodrawwithdrawArrays,drawElements, drawRangeElementsortheirinstancedvariantsgeneratesanINVALID_OPERATION errorifanyactiveuniformblockintheprogramusedforthedrawcommandisnotbackedbya sufficientlylargebufferobject. InOpenGL,insufficientuniformblockbackingisallowedtocauseGLinterruptionortermination. SeeOpenGLES3.0specificationsection2.12.6 ( OpenGLES3.0.6§2.12.6),under"UniformBufferObjectBindings." DefaultFramebuffer WebGLalwayshasadefaultframebuffer.TheFRAMEBUFFER_UNDEFINEDenumerantisremoved fromtheWebGL2.0API. StringLengthQueries IntheWebGL2.0API,theenumerantsACTIVE_UNIFORM_BLOCK_MAX_NAME_LENGTH, TRANSFORM_FEEDBACK_VARYING_MAX_LENGTH,UNIFORM_BLOCK_NAME_LENGTH,and UNIFORM_NAME_LENGTHareremovedinadditiontosimilar enumerantsremovedintheWebGL1.0API. InvalidClears IntheWebGL2.0API,tryingtoperformaclearwhenthereisamismatchbetweenthetypeofthe specifiedclearvalueandthetypeofabufferthatisbeingclearedgeneratesan INVALID_OPERATIONerrorinsteadofproducingundefinedresults. InvalidTextureOffsets AGLSLshaderwhichattemptstouseatextureoffsetvalueoutsidetherangespecifiedby implementation-definedparametersMIN_PROGRAM_TEXEL_OFFSETand MAX_PROGRAM_TEXEL_OFFSETintexturelookupfunctionargumentsmustfail compilationintheWebGL2.0API. Usinganoffsetoutsidethevalidrangereturnsundefinedresults,soitcannotbeallowed. TheoffsetmustbeaconstantexpressionaccordingtotheGLSLESspec,socheckingthe valueagainstthecorrectrangecanbedoneatcompiletime. TexelFetches TexelfetchesthathaveundefinedresultsintheOpenGLES3.0APImustreturnzero,oratexture sourcecolorof(0,0,0,1)inthecaseofatexelfetchfromanincompletetextureintheWebGL2.0 API. Behaviorofout-of-rangetexelfetchesneedstobetestableinordertoguaranteesecurity. GLSLES1.00FragmentShaderOutput AfragmentshaderwritteninTheOpenGLESShadingLanguage,Version1.00,thatstaticallyassignsa valuetogl_FragData[n]wherendoesnotequalconstantvalue0mustfail tocompileintheWebGL2.0API.ThisistoachieveconsistencywithTheOpenGLES3.0specification section4.2.1(OpenGLES3.0.6§4.2.1) andTheOpenGLESShadingLanguage3.00.6specificationsection1.5(GLSLES3.00.6§1.5). AsintheOpenGLES3.0API,multiplefragmentshaderoutputsareonlysupportedforGLSLES3.00 shadersintheWebGL2.0API. NoMapBufferRange TheMapBufferRange,FlushMappedBufferRange,andUnmapBuffer entrypointsareremovedfromtheWebGL2.0API.Thefollowingenumvaluesarealsoremoved: BUFFER_ACCESS_FLAGS,BUFFER_MAP_LENGTH,BUFFER_MAP_OFFSET, MAP_READ_BIT,MAP_WRITE_BIT,MAP_INVALIDATE_RANGE_BIT, MAP_INVALIDATE_BUFFER_BIT,MAP_FLUSH_EXPLICIT_BIT,and MAP_UNSYNCHRONIZED_BIT. InsteadofusingMapBufferRange,bufferdatamaybereadbyusingthe getBufferSubDataentrypoint. TIMEOUT_IGNORED IntheWebGL2.0APITIMEOUT_IGNOREDisdefinedasaGLint64withthevalue -1insteadofaGLuint64withthevalue0xFFFFFFFFFFFFFFFF.This isbecauseJavascriptcannotaccuratelyrepresentanintegerthatlarge.Forthesamereason waitSynctakesGLint64valuesinsteadofGLuint64fortimeout. clientWaitSync IntheWebGL2.0API,WebGLimplementationsmustenforceashortmaximumtimeoutoncallstoclientWaitSyncin ordertoavoidblockingexecutionofthemainthreadforexcessiveperiodsoftime.Thistimeoutmaybequeried bycallinggetParameterwiththeargumentMAX_CLIENT_WAIT_TIMEOUT_WEBGL. Theimplementation-definedmaximumtimeoutisnotspecified.Itisacceptableforanimplementationtoenforcea zeromaximumtimeout. VertexAttributeAliasing WebGL2.0APIimplementationsmuststrictlyfollowGLSLES3.00.6section12.46,which specifiesthatanyvertexattributealiasingisdisallowed.Asstatedin [GLES30]p57,GLSLES1.00shadersmaystillalias,asallowedby theWebGL1.0specsectionAttribute aliasing. PRIMITIVE_RESTART_FIXED_INDEXisalwaysenabled ThePRIMITIVE_RESTART_FIXED_INDEXcontextstate,controlled withEnable/DisableinOpenGLES3.0,isnotsupportedinWebGL 2.0.Instead,WebGL2.0behavesasthoughthisstatewerealwaysenabled.Thisisa compatibilitydifferencecomparedtoWebGL1.0. WhendrawElements,drawElementsInstanced, ordrawRangeElementsprocessesanindex,iftheindex'svalueisthemaximum forthedatatype(255forUNSIGNED_BYTEindices,65535 forUNSIGNED_SHORT,or4294967295forUNSIGNED_INT),thenthe vertexisnotprocessednormally.Instead,itisasifthedrawingcommandendedwiththe immediatelyprecedingvertex,andanotherdrawingcommandisimmediatelystartedwiththe sameparameters,butonlytransferringtheimmediatelyfollowingindexthroughtheendof theoriginallyspecifiedindices. Thiscompatibilitydifferencewasintroducedinordertoavoidperformancepitfallsin Direct3DbasedWebGLimplementations.Applicationsandcontentcreationtoolscanbe adjustedtoavoidusingthemaximumvertexindexiftheprimitiverestartbehaviorisnot desired. Notextureswizzles OpenGLES3.0introducesnewstateontextureobjectsallowingafour-channelswizzle operationtobespecifiedagainstthetexture.Theswizzleisappliedtoeverytexture lookupperformedwithinanyshaderreferencingthattexture.Thesetextureswizzlesare notsupportedinWebGL2.0.TEXTURE_SWIZZLE_*enumvaluesareremovedfrom theWebGL2.0API. TextureswizzlescannotbeimplementedinaperformantmanneronDirect3DbasedWebGL implementations.Applicationsrelyingonthisfunctionalitywouldrunsignificantlymore slowlyonthoseimplementations.Applicationsarestillabletoswizzleresultsoftexture fetchesinshadersandswizzletexturedatabeforeuploadingwithoutthisinterface. Queriesshouldfailonaprogramthatfailedtolink OpenGLES3.0allowsapplicationstoenumerateandquerypropertiesof activevariablesandinterfaceblocksofaspecifiedprogramevenif thatprogramfailedtolink(OpenGLES3.0.6§2.12.3). InWebGL,thesecommandswillalwaysgenerateanINVALID_OPERATIONerror onaprogramthatfailedtolink,andnoinformationisreturned. ThereturnedinformationinOpenGLES3.0isimplementationdependentandmaybeincomplete. Theerrorconditionisaddedtoensureconsistentbehavioracrossallplatforms. Colorvaluesfromafragmentshadermustmatchthecolorbufferformat Colorvalueswrittenbyafragmentshadermaybefloating-point,signedinteger,orunsigned integer.Ifthevalueswrittenbythefragmentshaderdonotmatchtheformat(s)ofthe correspondingcolorbuffer(s),theresultisundefinedinOpenGLES3.0(OpenGLES3.0.6§3.9.2.3).InWebGL,generates anINVALID_OPERATIONerrorinthecorrespondingdrawcall,including drawArrays,drawElements,drawArraysInstanced ,drawElementsInstanced,anddrawRangeElements. Ifthecolorbufferhasanormalizedfixed-pointformat,floating-pointcolor valuesareconvertedtomatchtheformat;generatesnoerrorinsuchsituation. Asamplertypemustmatchtheinternaltextureformat Texturelookupfunctionsreturnvaluesasfloatingpoint,unsignedintegerorsignedinteger, dependingonthesamplertypepassedtothelookupfunction.Ifthewrongsamplertypeis usedfortextureaccess,i.e.,thesamplertypedoesnotmatchthetextureinternalformat, thereturnedvaluesareundefinedinOpenGLESShadingLanguage3.00.6 (OpenGLESShadingLanguage3.00.6§8.8). InWebGL,generatesanINVALID_OPERATIONerrorinthecorrespondingdrawcall, includingdrawArrays,drawElements,drawArraysInstanced, drawElementsInstanced,anddrawRangeElements. Ifthesamplertypeisfloatingpointandtheinternaltextureformatis normalizedinteger,itisconsideredasamatchandthereturnedvaluesareconvertedto floatingpointintherange[0,1]. Queries'resultsmustnotbemadeavailableinthecurrentframe InOpenGLES3.0,iftheappropriateprimitives(e.g.glFinish()oranother synchronousAPI)arecalled,aquery'sresultmaybemadeavailableinthesameframeitwas issued.InWebGL,inordertoimproveapplicationportability,aquery'sresultmustnever bemadeavailabletotheapplicationinthesameframethequerywasissued.Seethe specificationofgetQueryParameterfordiscussionand rationale. GLSLES3.00#extensiondirectivelocation TheWebGL1.0specificationsection GLSLES#extensiondirectivelocationonlyappliestoOpenGLESShadingLanguage1.00 shaders.ItdoesnotapplytoshadersthatarewritteninOpenGLESShadingLanguage3.00. InshaderswritteninOpenGLESShadingLanguage3.00,#extensiondirectives mustoccurbeforenon-preprocessortokensregardlessofwhatiswrittenintheextension specification. ThisisdonetomakeWebGL2.0tofollowthewrittenGLSLES3.00specificationmore closely.EnforcingtherestrictionmorestrictlythannativeGLESdriversmakesthebehavior well-defined. Onlystd140layoutsupportedinuniformblocks TheGLSLES3.00specificationsupportstheshared,packed, andstd140layoutqualifiersforuniformblocks,defininghowvariablesare laidoutinuniformbuffers'storage.Ofthese,theWebGL2.0specificationsupportsonly thestd140layout,whichisdefined inOpenGL ES3.0.6§2.12"VertexShaders",subsection"StandardUniformBlock Layout".Shadersattemptingtousethesharedorpackedlayout qualifierswillfaileitherthecompilationorlinkingstages. Theinitialstateofcompilationisasifthefollowingweredeclared: layout(std140)uniform; Thisrestrictionisenforcedtoimproveportabilitybyavoidingexposinguniformblock layoutsthatarespecifictoonevendor'sGPUs. DisallowedvariantsofGLSLES3.00operators IntheWebGL2.0API,thefollowingshadinglanguageconstructsarenotallowedand attemptingtousethemmustresultinacompileerror: Ternaryoperatorappliedtovoid,arrays,orstructscontainingarrays Sequenceoperatorappliedtovoid,arrays,orstructscontainingarrays ThisrestrictionensureseasyportabilityacrossOpenGLES3.0supportingdevices. checkFramebufferStatusmayreturnFRAMEBUFFER_INCOMPLETE_DIMENSIONS Allattachedimagesmuchhavethesamewidthandheight;otherwise,checkFramebufferStatusreturnsFRAMEBUFFER_INCOMPLETE_DIMENSIONS. InOpenGLES3,attachedimagesforaframebufferneednottohavethesamewidthandheighttobeframebuffercomplete,andFRAMEBUFFER_INCOMPLETE_DIMENSIONSisnotoneofthevalidreturnvaluesforcheckFramebufferStatus.However,inDirect3D11,ontopofwhichOpenGLES3behaviorisemulatedinWindows,allrendertargetsmusthavethesamesizeinalldimensions(seemsdnmanualpage).EmulationoftheES3semanticontopofDirectX11willbeinefficient.InordertohaveconsistentWebGL2.0behaviorsacrossplatforms,itisreasonabletokeeptheOpenGLES2/WebGL1.0restrictionforWebGL2.0thatallattachedimagesmusthavethesamewidthandheight. Uniformblockmatching IntheWebGL2.0API,layoutqualifiersrow_majorandcolumn_major arerequiredtomatchinmatcheduniformblocksevenwhentheyareappliedexclusivelyon non-matrixvariables. ThisuniformblockmatchingruleisknowntobeinconsistentacrossOpenGLES3.0 implementations. Framebuffercontentsafterinvalidation InOpenGLES3.0,aftercallinginvalidateFramebufferorinvalidateSubFramebuffer, theaffectedregion'scontentsbecomeeffectivelyundefined.InWebGL2.0,itisrequiredforthecontents toeitherstayunchangedorbecomeall0. ItisacceptableforWebGL2.0implementationstomakeinvalidateFramebufferor invalidateSubFramebufferano-op. NoArrayBufferViewmatchingtexturetypeFLOAT_32_UNSIGNED_INT_24_8_REV IntexImage2DandtexImage3DwithArrayBufferView,if typeisFLOAT_32_UNSIGNED_INT_24_8_REVandsrcDataisnot null,generatesanINVALID_OPERATION. IntexSubImage2DandtexSubImage3DwithArrayBufferView,iftypeis FLOAT_32_UNSIGNED_INT_24_8_REV,generatesanINVALID_ENUM. VertexAttribfunctionmustmatchshaderattributetype Ifanyofthefollowingsituationsaretrue,attemptingtodrawwithdrawArrays, drawElements,drawRangeElementsortheirinstancedvariantsgeneratesan INVALID_OPERATIONerror: vertexAttribPointer,vertexAttrib{1234}f,orvertexAttrib{1234}fv isusedandthebasetypeoftheshaderattributeatslotindexisnot floating-point(e.g.issignedorunsignedinteger); vertexAttribIPointerisusedwithtypeUNSIGNED_BYTE, UNSIGNED_SHORTorUNSIGNED_INT,orvertexAttribI4uior vertexAttribI4uivisused,andthebasetypeoftheshaderattributeatslot indexisnotunsignedinteger(e.g.isfloating-pointorsignedinteger); vertexAttribIPointerisusedwithtypeBYTE, SHORTorINT,orvertexAttribI4ior vertexAttribI4ivisused,andthebasetypeoftheshaderattributeatslot indexisnotsignedinteger(e.g.isfloating-pointorunsignedinteger). ThisundefinedbehaviorisintheOpenGLES3.0specificationsection2.8 ( OpenGLES3.0.6§2.8). Transformfeedbackprimitivecapture Ifanyoutputvariableisspecifiedtobestreamedtoabufferobjectbutnotactually writtenbyavertexshader,thevalueissetto0. ThisundefinedbehaviorisintheOpenGLES3.0specificationsection2.15.2 ( OpenGLES3.0.6§2.15.2). gl_FragDepth Ifafragmentshaderstaticallyassignsavaluetogl_FragDepth,foranyfragment wherestatementsassigningavaluetogl_FragDeptharenotexecuted,thevalue0isused. ThisundefinedbehaviorisintheOpenGLES3.0specificationsection3.9.2 ( OpenGLES3.0.6§3.9.2). Framebuffercolorattachments Ifanimageisattachedtomorethanonecolorattachmentpointinaframebuffer, checkFramebufferStatusreturnsFRAMEBUFFER_UNSUPPORTED. Animagecanbeanindividualmiplevel,anarrayslice(fromeither2Darray orcubemaptextures),ora3Dtextureslice. ThisisalimitationofDirect3D11,ontopofwhichOpenGLES3behaviorisemulatedonWindows. (seemsdnmanual page).InordertohaveconsistentWebGL2.0behavioracrossplatforms,itisreasonabletoadd thislimitationinWebGL2.0forallplatforms. PixelstoreparametersforuploadsfromTexImageSource UNPACK_ALIGNMENTandUNPACK_ROW_LENGTHareignored. UNPACK_ALIGNMENTisspecifiedinbytes,andisimplicitand implementation-dependentforTexImageSourceobjects.UNPACK_ROW_LENGTHis currentlyunused. SubrectselectionispossibleusingUNPACK_params. UNPACK_SKIP_PIXELSandUNPACK_SKIP_ROWSdeterminetheoriginofthe subrect,withthewidthandheightargumentsdeterminingthesizeofthesubrect. For3Dtextures,thewidth,height,anddepth argumentsspecifyarectangularregionofatexelarraytounpackto. UNPACK_SKIP_IMAGESandUNPACK_IMAGE_HEIGHTallowselectionof multipleslicesfromthe2Dsource.UNPACK_IMAGE_HEIGHTdeterminesthestride, inrows,betweentwoslices.Forexample,aTexImageSource30pixelstallmay havethetop10andbottom10rowsuploadedintotwoslicesofa3Dtexturebyuploadingwith heightequalto10,UNPACK_IMAGE_HEIGHTsetto20,and depthequalto2.IfUNPACK_IMAGE_HEIGHTis0,thestride,in rows,betweentwoslicesdefaultstoheight. ForanHTMLImageElement20pixelswide,passingwidth=10for textureuploadwillcauseonlythelefthalfoftheimagetobeselected,thusuploaded.The resultingtexturewillhaveawidthof10.If,additionallyinthisexample, UNPACK_SKIP_PIXELSissetto10,onlytherighthalfoftheimageisselected forunpack. Also,UNPACK_SKIP_IMAGESappliesonlyto3Dentrypoints,notto2Dentrypoints. Lookingatanotherexample,theabove32x48imageofsixcolors,eachofsize16x16,isuploadedto a3Dtextureofwidth=2,height=1,anddepth=3. IfUNPACK_SKIP_PIXELSis0,UNPACK_SKIP_ROWSis0,andUNPACK_IMAGE_HEIGHT is0,theentiretexelarrayissettored. IfUNPACK_SKIP_PIXELSis16,UNPACK_SKIP_ROWSis16,andUNPACK_IMAGE_HEIGHT is0,theentiretexelarrayissettoyellow. IfUNPACK_SKIP_PIXELSis0,UNPACK_SKIP_ROWSis0,andUNPACK_IMAGE_HEIGHT is16,thefirstsliceofthetexelarrayisred,thesecondsliceisblue,andthethirdsliceispurple. IfUNPACK_SKIP_PIXELSis16,UNPACK_SKIP_ROWSis0,andUNPACK_IMAGE_HEIGHT is16,thefirstsliceofthetexelarrayisgreen,thesecondsliceisyellow,andthethirdsliceispink. Pixelstoreparameterconstraints Define: DataStoreWidth:=ROW_LENGTH?ROW_LENGTH:width DataStoreHeight:=IMAGE_HEIGHT?IMAGE_HEIGHT:height IfPACK_SKIP_PIXELS+width>DataStoreWidth,readPixels generatesanINVALID_OPERATIONerror. IfUNPACK_SKIP_PIXELS+width>DataStoreWidth, texImage2DandtexSubImage2Dgeneratean INVALID_OPERATIONerror.ThisdoesnotapplytotexImage2Difno PIXEL_UNPACK_BUFFERisboundandsrcDataisnull. IfUNPACK_SKIP_PIXELS+width>DataStoreWidthor UNPACK_SKIP_ROWS+height>DataStoreHeight,texImage3D andtexSubImage3DgenerateanINVALID_OPERATIONerror.Thisdoes notapplytotexImage3DifnoPIXEL_UNPACK_BUFFERisboundand srcDataisnull. Theseconstraintsnormalizetheuseoftheseparameterstospecifyasubregionwhere pixelsarestored.Forexample,inreadPixelscases,ifwewanttostore pixelstoasubareaoftheentiredatastore,wecanusePACK_ROW_LENGTHto specifythedatastorewidth,andPACK_SKIP_PIXELS, PACK_SKIP_ROWS,widthandheighttospecifythesubarea's xoffset,yoffset,width,andheight. Thesecontraintsalsoforbidrowandimageoverlap,wherethesituationsarenottestedin theOpenGLES3.0DEQPtestsuites,andmanydriversbehaveincorrectly.Theyalsoforbid skippingrandompixelsorrows,butthatcanbeachievedbyadjustingthedatastoreoffset accordingly. Further,foruploadsfromTexImageSource,implied UNPACK_ROW_LENGTHandUNPACK_ALIGNMENTarenotstrictlydefined. Theserestrictionsensureconsistentandefficientbehaviorregardlessofimplied UNPACK_params. IfUNPACK_FLIP_Y_WEBGLorUNPACK_PREMULTIPLY_ALPHA_WEBGLissettotrue, texImage2DandtexSubImage2DgenerateanINVALID_OPERATIONerror iftheyuploaddatafromaPIXEL_UNPACK_BUFFER. IfUNPACK_FLIP_Y_WEBGLorUNPACK_PREMULTIPLY_ALPHA_WEBGLissettotrue, texImage3DandtexSubImage3DgenerateanINVALID_OPERATIONerror iftheyuploaddatafromaPIXEL_UNPACK_BUFFERoranon-nullclientside ArrayBufferView. NoETC2andEACcompressedtextureformats OpenGLES3.0requiressupportforthefollowingETC2andEACcompressedtextureformats: COMPRESSED_R11_EAC,COMPRESSED_SIGNED_R11_EAC,COMPRESSED_RG11_EAC, COMPRESSED_SIGNED_RG11_EAC,COMPRESSED_RGB8_ETC2,COMPRESSED_SRGB8_ETC2, COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2,COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2, COMPRESSED_RGBA8_ETC2_EAC,andCOMPRESSED_SRGB8_ALPHA8_ETC2_EAC. ThesetextureformatsarenotsupportedbydefaultinWebGL2.0. TheseformatsarenotnativelysupportedbymostdesktopGPUhardware. Assuch,supportingtheseformatsrequiressoftwaredecompressionineitherthe WebGLimplementationortheunderlyingdriver.Thisresultsinadrastic increaseinvideomemoryusage,causingperformancelosseswhichare invisibletotheWebGLapplication. OnhardwarewhichsupportstheETC2andEACcompressedtextureformatsnatively (e.g.mobileOpenGLES3.0+hardware),theymaybeexposedviatheextension WEBGL_compressed_texture_etc. ThevalueofUNIFORM_BUFFER_OFFSET_ALIGNMENTmustbedivisibleby4 ThevalueofUNIFORM_BUFFER_OFFSET_ALIGNMENT,asgiveninbasicmachineunits,mustbedivisibleby4. IfthevalueofUNIFORM_BUFFER_OFFSET_ALIGNMENTwasnotdivisibleby4,itwouldmakeitimpracticaltouploadArrayBufferstouniformbufferswhichareboundwithBindBufferRange. Syncobjects'resultsmustnotbemadeavailableinthecurrentframe InOpenGLES3.0,iftheappropriateprimitives(e.g.glFinish()oranother synchronousAPI)arecalled,asyncobjectmaybesignaledinthesameframeitwas issued.InWebGL,inordertoimproveapplicationportability,asyncobjectmustnever transitiontothesignaledstateinthesameframethesyncwasissued.Seethe specificationofgetSyncParameter andclientWaitSyncfordiscussionandrationale. blitFramebufferrectanglewidth/heightlimitations blitFramebuffer()src*anddst*parametersmustbesetsothattheresulting widthandheightofthesourceanddestinationrectanglesarelessthanorequaltothe maximumvaluethatcanbestoredinaGLint.Incasecomputinganyofthewidthorheight valuesasaGLintresultsinintegeroverflow,blitFramebuffer()generatesan INVALID_VALUEerror. Usinglargerthanmax32-bitintsizedrectanglesforblitFramebuffertriggersissueson mostdesktopOpenGLdrivers,andthereisnogeneralworkaroundforcaseswhere blitFramebufferisusedtoscaletheframebuffer. GenerateMipmaprequirespositiveimagedimensions generateMipmaprequiresthatTEXTURE_BASE_LEVEL'sdimensionsareallpositive. GLES3.0.6technicallyallowscallingGenerateMipmapon0x0images,thoughcubemapsmustbe cube-complete,thushavingpositivedimensions. Thischangesimplifiesimplementationsbyallowingaconceptofbase-level-completenessfor textures,asotherwiserequiredfornon-mipmap-sampledvalidation. SinceGenerateMipmaphasnoeffectona0x0texture,andisillegalinWebGL1(0isnota poweroftwo),thisisaneasyrestrictiontoadd. Further,GenerateMipmapwouldotherwisebetheonlyentrypointthathastooperateon undefinedtextureimages,skippinganotherwise-commonvalidation. deleteQueryimplicitlycallsendQueryifthequeryisactive InGLES,DeleteQueriesdoesnotimplicitlyendqueries,eveniftheyareactive. Thisdeviationwasnotoriginallyspecified,butwasimplicitlystandardizedacross browsersbyconformancetests. Someimplementationsfoundthisbehaviorsimplertoimplement. RevertingthisbehaviortomatchtheGLESspecscouldbreakcontent,andatthis pointit'sbettertospecwhatweimplemented. Requiredcompressedtextureformats Implementationsmustsupportatleastonesuiteofcompressedtextureformats. Implementationsmustsupport: WEBGL_compressed_texture_etcAND/OR ( WEBGL_compressed_texture_s3tcAND WEBGL_compressed_texture_s3tc_srgbAND EXT_texture_compression_rgtc ) Tobestsupportourecosystem,werequireimplementationstosupporteitherETC2/EACformats(universalonGLES3orsimilardrivers,likemanyphones)orS3TCformats(universalallotherdrivers). Thisguaranteestoauthorsthattheycanalwaysusecompressedtextures(includingsrgbvariants)onalldeviceswhilemaintainingsupportforasfewastwodifferentformats. Thereareroughlyequivalentformatsineachsuiteforthefollowinguses: Usage S3TC/RGTCoption(desktop) ETC2/EACoption(mobile) R11unsigned COMPRESSED_RED_RGTC1_EXT COMPRESSED_R11_EAC R11signed COMPRESSED_SIGNED_RED_RGTC1_EXT COMPRESSED_SIGNED_R11_EAC RG11unsigned COMPRESSED_RED_GREEN_RGTC2_EXT COMPRESSED_RG11_EAC RG11signed COMPRESSED_SIGNED_RED_GREEN_RGTC2_EXT COMPRESSED_SIGNED_RG11_EAC RGB8unsigned COMPRESSED_RGB_S3TC_DXT1_EXT COMPRESSED_RGB8_ETC2 RGB8sRGB COMPRESSED_SRGB_S3TC_DXT1_EXT COMPRESSED_SRGB8_ETC2 RGB8punchthroughunsigned COMPRESSED_RGBA_S3TC_DXT1_EXT COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2 RGB8punchthroughsRGB COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2 RGBA8unsigned COMPRESSED_RGBA_S3TC_DXT5_EXT COMPRESSED_RGBA8_ETC2_EAC RGBA8sRGB COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT COMPRESSED_SRGB8_ALPHA8_ETC2_EAC References [WEBGL10] WebGLSpecification1.0.4Editor'sDraft, DeanJackson,JeffGilbert. [CANVAS] HTML5:TheCanvasElement, WorldWideWebConsortium(W3C). [OFFSCREENCANVAS] HTMLLivingStandard-TheOffscreenCanvasinterface, WHATWG. [CANVASCONTEXTS] CanvasContextRegistry, WHATWG. [GLES30] OpenGL®ESVersion3.0.6, J.Leech,B.Lipchak,August2019. [GLES30GLSL] TheOpenGL®ESShadingLanguageVersion3.00.6, R.Simpson,January2016. [REGISTRY] WebGLExtensionRegistry [RFC2119] KeywordsforuseinRFCstoIndicateRequirementLevels, S.Bradner.IETF,March1997. [WEBIDL] WebIDL-LivingStandard, E.Chen,T.Gu,B.Zbarsky,C.McCormack,T.Langel.

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