这篇翻译不完整。请帮忙从英语翻译这篇文章

WebGL API 提供了一些常量,这些常量常作为参数传入函数调用,或常作为函数的返回值。所有这些常量都是 GLenum 类型。

标准WebGL常量挂载在WebGL的两个渲染上下文环境(WebGLRenderingContextWebGL2RenderingContext)中,因此,以形如gl.CONSTANT_NAME的形式使用WebGL常量:

var canvas = document.getElementById('myCanvas');
var gl = canvas.getContext('webgl');

gl.getParameter(gl.LINE_WIDTH);

其中一些常量也由WebGL扩展提供,如下方提供的清单:

var debugInfo = gl.getExtension('WEBGL_debug_renderer_info');
var vendor = gl.getParameter(debugInfo.UNMASKED_VENDOR_WEBGL);

WebGL tutorial 中有更多关于WebGL的信息,示例和如何开始WebGL编程的其它资源。

常量表

标准 WebGL 1 常量

这些常量定义在 WebGLRenderingContext 接口中。

清除缓存

常量传入 WebGLRenderingContext.clear() 作为清除缓冲区掩码(buffer masks)。

常量名称 说明
DEPTH_BUFFER_BIT 0x00000100 通过 clear 来清除深度缓冲区。
STENCIL_BUFFER_BIT 0x00000400 通过 clear 来清除当前模板缓冲区。
COLOR_BUFFER_BIT 0x00004000 通过 clear 来清除颜色缓冲区。

指定渲染图元 Rendering primitives

传递常量 WebGLRenderingContext.drawElements()WebGLRenderingContext.drawArrays() 来指定要以何种原始类型渲染。

常量名称 说明
POINTS 0x0000 传递给 drawElements 或drawArrays 画点。
LINES 0x0001 传递给  drawElements 或drawArrays 画线。 每个顶点链接到它的下一个顶点。每两点画一条线段。
LINE_LOOP 0x0002 传递给  drawElements 或drawArrays 画线带。 每两个点被当作是一条独立的线段。线段首尾相连。
LINE_STRIP 0x0003 传递给  drawElements 或drawArrays 画一个从第一个顶点到最后一个顶点组成的相连的线环。最后一个点与第一个点相连。
TRIANGLES 0x0004 传递给drawElements 或drawArrays画三角形。 每三个点创建一个独立的三角形。
TRIANGLE_STRIP 0x0005 传递给drawElementsdrawArrays 画一组连接的三角形带。
TRIANGLE_FAN 0x0006

传递给 drawElements 或drawArrays 画一组连接的三角形。以第一个点做原点,每个顶点都连着它的前一个点和后一个点(类似风扇)。

Blending modes

传递常量 WebGLRenderingContext.blendFunc()WebGLRenderingContext.blendFuncSeparate() 来指定混合模式 (关于两者, RBG和alpha, 或者separately).

常量名称 说明
ZERO 0 Passed to blendFunc or blendFuncSeparate to turn off a component.
ONE 1 Passed to blendFunc or blendFuncSeparate to turn on a component.
SRC_COLOR 0x0300 Passed to blendFunc or blendFuncSeparate to multiply a component by the source elements color.
ONE_MINUS_SRC_COLOR 0x0301 Passed to blendFunc or blendFuncSeparate to multiply a component by one minus the source elements color.
SRC_ALPHA 0x0302 Passed to blendFunc or blendFuncSeparate to multiply a component by the source's alpha.
ONE_MINUS_SRC_ALPHA 0x0303 Passed to blendFunc or blendFuncSeparate to multiply a component by one minus the source's alpha.
DST_ALPHA 0x0304 Passed to blendFunc or blendFuncSeparate to multiply a component by the destination's alpha.
ONE_MINUS_DST_ALPHA 0x0305 Passed to blendFunc or blendFuncSeparate to multiply a component by one minus the destination's alpha.
DST_COLOR 0x0306 Passed to blendFunc or blendFuncSeparate to multiply a component by the destination's color.
ONE_MINUS_DST_COLOR 0x0307 Passed to blendFunc or blendFuncSeparate to multiply a component by one minus the destination's color.
SRC_ALPHA_SATURATE 0x0308 Passed to blendFunc or blendFuncSeparate to multiply a component by the minimum of source's alpha or one minus the destination's alpha.
CONSTANT_COLOR 0x8001 Passed to blendFunc or blendFuncSeparate to specify a constant color blend function.
ONE_MINUS_CONSTANT_COLOR 0x8002 Passed to blendFunc or blendFuncSeparate to specify one minus a constant color blend function.
CONSTANT_ALPHA 0x8003 Passed to blendFunc or blendFuncSeparate to specify a constant alpha blend function.
ONE_MINUS_CONSTANT_ALPHA 0x8004 Passed to blendFunc or blendFuncSeparate to specify one minus a constant alpha blend function.

Blending equations

Constants passed to WebGLRenderingContext.blendEquation() or WebGLRenderingContext.blendEquationSeparate() to control how the blending is calculated (for both, RBG and alpha, or separately).

常量名称 说明
FUNC_ADD 0x8006 Passed to blendEquation or blendEquationSeparate to set an addition blend function.
FUNC_SUBSTRACT 0x800A Passed to blendEquation or blendEquationSeparate to specify a subtraction blend function (source - destination).
FUNC_REVERSE_SUBTRACT 0x800B Passed to blendEquation or blendEquationSeparate to specify a reverse subtraction blend function (destination - source).

Getting GL parameter information

Constants passed to WebGLRenderingContext.getParameter() to specify what information to return.

常量名称 说明
BLEND_EQUATION 0x8009 Passed to getParameter to get the current RGB blend function.
BLEND_EQUATION_RGB 0x8009 Passed to getParameter to get the current RGB blend function. Same as BLEND_EQUATION
BLEND_EQUATION_ALPHA 0x883D Passed to getParameter to get the current alpha blend function. Same as BLEND_EQUATION
BLEND_DST_RGB 0x80C8 Passed to getParameter to get the current destination RGB blend function.
BLEND_SRC_RGB 0x80C9 Passed to getParameter to get the current destination RGB blend function.
BLEND_DST_ALPHA 0x80CA Passed to getParameter to get the current destination alpha blend function.
BLEND_SRC_ALPHA 0x80CB Passed to getParameter to get the current source alpha blend function.
BLEND_COLOR 0x8005 Passed to getParameter to return a the current blend color.
ARRAY_BUFFER_BINDING 0x8894 Passed to getParameter to get the array buffer binding.
ELEMENT_ARRAY_BUFFER_BINDING 0x8895 Passed to getParameter to get the current element array buffer.
LINE_WIDTH 0x0B21 Passed to getParameter to get the current lineWidth (set by the lineWidth method).
ALIASED_POINT_SIZE_RANGE 0x846D Passed to getParameter to get the current size of a point drawn with gl.POINTS
ALIASED_LINE_WIDTH_RANGE 0x846E Passed to getParameter to get the range of available widths for a line. Returns a length-2 array with the lo value at 0, and hight at 1.
CULL_FACE_MODE 0x0B45 Passed to getParameter to get the current value of cullFace. Should return FRONT, BACK, or FRONT_AND_BACK
FRONT_FACE 0x0B46 Passed to getParameter to determine the current value of frontFace. Should return CW or CCW.
DEPTH_RANGE 0x0B70 Passed to getParameter to return a length-2 array of floats giving the current depth range.
DEPTH_WRITEMASK 0x0B72 Passed to getParameter to determine if the depth write mask is enabled.
DEPTH_CLEAR_VALUE 0x0B73 Passed to getParameter to determine the current depth clear value.
DEPTH_FUNC 0x0B74 Passed to getParameter to get the current depth function. Returns NEVER, ALWAYS, LESS, EQUAL, LEQUAL, GREATER, GEQUAL, or NOTEQUAL.
STENCIL_CLEAR_VALUE 0x0B91 Passed to getParameter to get the value the stencil will be cleared to.
STENCIL_FUNC 0x0B92 Passed to getParameter to get the current stencil function. Returns NEVER, ALWAYS, LESS, EQUAL, LEQUAL, GREATER, GEQUAL, or NOTEQUAL.
STENCIL_FAIL 0x0B94 Passed to getParameter to get the current stencil fail function. Should return KEEP, REPLACE, INCR, DECR, INVERT, INCR_WRAP, or DECR_WRAP.
STENCIL_PASS_DEPTH_FAIL 0x0B95 Passed to getParameter to get the current stencil fail function should the depth buffer test fail. Should return KEEP, REPLACE, INCR, DECR, INVERT, INCR_WRAP, or DECR_WRAP.
STENCIL_PASS_DEPTH_PASS 0x0B96 Passed to getParameter to get the current stencil fail function should the depth buffer test pass. Should return KEEP, REPLACE, INCR, DECR, INVERT, INCR_WRAP, or DECR_WRAP.
STENCIL_REF 0x0B97 Passed to getParameter to get the reference value used for stencil tests.
STENCIL_VALUE_MASK 0x0B93
STENCIL_WRITEMASK 0x0B98
STENCIL_BACK_FUNC 0x8800
STENCIL_BACK_FAIL 0x8801
STENCIL_BACK_PASS_DEPTH_FAIL 0x8802
STENCIL_BACK_PASS_DEPTH_PASS 0x8803
STENCIL_BACK_REF 0x8CA3
STENCIL_BACK_VALUE_MASK 0x8CA4
STENCIL_BACK_WRITEMASK 0x8CA5
VIEWPORT 0x0BA2 Returns an Int32Array with four elements for the current viewport dimensions.
SCISSOR_BOX 0x0C10 Returns an Int32Array with four elements for the current scissor box dimensions.
COLOR_CLEAR_VALUE 0x0C22
COLOR_WRITEMASK 0x0C23
UNPACK_ALIGNMENT 0x0CF5
PACK_ALIGNMENT 0x0D05
MAX_TEXTURE_SIZE 0x0D33
MAX_VIEWPORT_DIMS 0x0D3A
SUBPIXEL_BITS 0x0D50
RED_BITS 0x0D52
GREEN_BITS 0x0D53
BLUE_BITS 0x0D54
ALPHA_BITS 0x0D55
DEPTH_BITS 0x0D56
STENCIL_BITS 0x0D57
POLYGON_OFFSET_UNITS 0x2A00
POLYGON_OFFSET_FACTOR 0x8038
TEXTURE_BINDING_2D 0x8069
SAMPLE_BUFFERS 0x80A8
SAMPLES 0x80A9
SAMPLE_COVERAGE_VALUE 0x80AA
SAMPLE_COVERAGE_INVERT 0x80AB
COMPRESSED_TEXTURE_FORMATS 0x86A3
VENDOR 0x1F00
RENDERER 0x1F01
VERSION 0x1F02
IMPLEMENTATION_COLOR_READ_TYPE 0x8B9A
IMPLEMENTATION_COLOR_READ_FORMAT 0x8B9B
BROWSER_DEFAULT_WEBGL 0x9244

Buffers

Constants passed to WebGLRenderingContext.bufferData(), WebGLRenderingContext.bufferSubData(), WebGLRenderingContext.bindBuffer(), or WebGLRenderingContext.getBufferParameter().

常量名称 说明
STATIC_DRAW 0x88E4 Passed to bufferData as a hint about whether the contents of the buffer are likely to be used often and not change often.
STREAM_DRAW 0x88E0 Passed to bufferData as a hint about whether the contents of the buffer are likely to not be used often.
DYNAMIC_DRAW 0x88E8 Passed to bufferData as a hint about whether the contents of the buffer are likely to be used often and change often.
ARRAY_BUFFER 0x8892 Passed to bindBuffer or bufferData to specify the type of buffer being used.
ELEMENT_ARRAY_BUFFER 0x8893 Passed to bindBuffer or bufferData to specify the type of buffer being used.
BUFFER_SIZE 0x8764 Passed to getBufferParameter to get a buffer's size.
BUFFER_USAGE 0x8765 Passed to getBufferParameter to get the hint for the buffer passed in when it was created.

Vertex attributes

Constants passed to WebGLRenderingContext.getVertexAttrib().

常量名称 说明
CURRENT_VERTEX_ATTRIB 0x8626 Passed to getVertexAttrib to read back the current vertex attribute.
VERTEX_ATTRIB_ARRAY_ENABLED 0x8622
VERTEX_ATTRIB_ARRAY_SIZE 0x8623
VERTEX_ATTRIB_ARRAY_STRIDE 0x8624
VERTEX_ATTRIB_ARRAY_TYPE 0x8625
VERTEX_ATTRIB_ARRAY_NORMALIZED 0x886A
VERTEX_ATTRIB_ARRAY_POINTER 0x8645
VERTEX_ATTRIB_ARRAY_BUFFER_BINDING 0x889F

Culling

Constants passed to WebGLRenderingContext.cullFace().

常量名称 说明
CULL_FACE 0x0B44 Passed to enable/disable to turn on/off culling. Can also be used with getParameter to find the current culling method.
FRONT 0x0404 Passed to cullFace to specify that only front faces should be drawn.
BACK 0x0405 Passed to cullFace to specify that only back faces should be drawn.
FRONT_AND_BACK 0x0408 Passed to cullFace to specify that front and back faces should be drawn.

Enabling and disabling

Constants passed to WebGLRenderingContext.enable() or WebGLRenderingContext.disable().

常量名称 说明
BLEND 0x0BE2 Passed to enable/disable to turn on/off blending. Can also be used with getParameter to find the current blending method.
DEPTH_TEST 0x0B71 通过 enable/disable 来打开/关闭深度测试。 也可以使用 getParameter 来查询深度测试。LEQUAL
DITHER 0x0BD0 Passed to enable/disable to turn on/off dithering. Can also be used with getParameter to find the current dithering method.
POLYGON_OFFSET_FILL 0x8037 Passed to enable/disable to turn on/off the polygon offset. Useful for rendering hidden-line images, decals, and or solids with highlighted edges. Can also be used with getParameter to query the scissor test.
SAMPLE_ALPHA_TO_COVERAGE 0x809E Passed to enable/disable to turn on/off the alpha to coverage. Used in multi-sampling alpha channels.
SAMPLE_COVERAGE 0x80A0 Passed to enable/disable to turn on/off the sample coverage. Used in multi-sampling.
SCISSOR_TEST 0x0C11 Passed to enable/disable to turn on/off the scissor test. Can also be used with getParameter to query the scissor test.
STENCIL_TEST 0x0B90 Passed to enable/disable to turn on/off the stencil test. Can also be used with getParameter to query the stencil test.

Errors

Constants returned from WebGLRenderingContext.getError().

常量名称 说明
NO_ERROR 0 Returned from getError.
INVALID_ENUM 0x0500 Returned from getError.
INVALID_VALUE 0x0501 Returned from getError.
INVALID_OPERATION 0x0502 Returned from getError.
OUT_OF_MEMORY 0x0505 Returned from getError.
CONTEXT_LOST_WEBGL 0x9242 Returned from getError.

Front face directions

Constants passed to WebGLRenderingContext.frontFace().

常量名称 说明
CW 0x0900 Passed to frontFace to specify the front face of a polygon is drawn in the clockwise direction
CCW 0x0901 Passed to frontFace to specify the front face of a polygon is drawn in the counter clockwise direction

Hints

Constants passed to WebGLRenderingContext.hint()

常量名称 说明
DONT_CARE 0x1100 There is no preference for this behavior.
FASTEST 0x1101 The most efficient behavior should be used.
NICEST 0x1102 The most correct or the highest quality option should be used.
GENERATE_MIPMAP_HINT 0x8192 Hint for the quality of filtering when generating mipmap images with WebGLRenderingContext.generateMipmap().

Data types

常量名称 说明
BYTE 0x1400
UNSIGNED_BYTE 0x1401
SHORT 0x1402
UNSIGNED_SHORT 0x1403
INT 0x1404
UNSIGNED_INT 0x1405
FLOAT 0x1406

Pixel formats

常量名称 说明
DEPTH_COMPONENT 0x1902
ALPHA 0x1906
RGB 0x1907
RGBA 0x1908
LUMINANCE 0x1909
LUMINANCE_ALPHA 0x190A

Pixel types

常量名称 说明
UNSIGNED_BYTE 0x1401
UNSIGNED_SHORT_4_4_4_4 0x8033
UNSIGNED_SHORT_5_5_5_1 0x8034
UNSIGNED_SHORT_5_6_5 0x8363

Shaders

Constants passed to WebGLRenderingContext.createShader() or WebGLRenderingContext.getShaderParameter()

常量名称 说明
FRAGMENT_SHADER 0x8B30 Passed to createShader to define a fragment shader.
VERTEX_SHADER 0x8B31 Passed to createShader to define a vertex shader
COMPILE_STATUS 0x8B81 Passed to getShaderParamter to get the status of the compilation. Returns false if the shader was not compiled. You can then query getShaderInfoLog to find the exact error
DELETE_STATUS 0x8B80 Passed to getShaderParamter to determine if a shader was deleted via deleteShader. Returns true if it was, false otherwise.
LINK_STATUS 0x8B82 Passed to getProgramParameter after calling linkProgram to determine if a program was linked correctly. Returns false if there were errors. Use getProgramInfoLog to find the exact error.
VALIDATE_STATUS 0x8B83 Passed to getProgramParameter after calling validateProgram to determine if it is valid. Returns false if errors were found.
ATTACHED_SHADERS 0x8B85 Passed to getProgramParameter after calling attachShader to determine if the shader was attached correctly. Returns false if errors occurred.
ACTIVE_ATTRIBUTES 0x8B89 Passed to getProgramParameter to get the number of attributes active in a program.
ACTIVE_UNIFORMS 0x8B86 Passed to getProgramParamter to get the number of uniforms active in a program.
MAX_VERTEX_ATTRIBS 0x8869
MAX_VERTEX_UNIFORM_VECTORS 0x8DFB
MAX_VARYING_VECTORS 0x8DFC
MAX_COMBINED_TEXTURE_IMAGE_UNITS 0x8B4D
MAX_VERTEX_TEXTURE_IMAGE_UNITS 0x8B4C
MAX_TEXTURE_IMAGE_UNITS 0x8872 Implementation dependent number of maximum texture units. At least 8.
MAX_FRAGMENT_UNIFORM_VECTORS 0x8DFD
SHADER_TYPE 0x8B4F
SHADING_LANGUAGE_VERSION 0x8B8C
CURRENT_PROGRAM 0x8B8D

Depth or stencil tests

Constants passed to WebGLRenderingContext.depthFunc() or WebGLRenderingContext.stencilFunc().

Constant name Value Description
NEVER 0x0200 Passed to depthFunction or stencilFunction to specify depth or stencil tests will never pass. i.e. Nothing will be drawn.
ALWAYS 0x0207 Passed to depthFunction or stencilFunction to specify depth or stencil tests will always pass. i.e. Pixels will be drawn in the order they are drawn.
LESS 0x0201 Passed to depthFunction or stencilFunction to specify depth or stencil tests will pass if the new depth value is less than the stored value.
EQUAL 0x0202 Passed to depthFunction or stencilFunction to specify depth or stencil tests will pass if the new depth value is equals to the stored value.
LEQUAL 0x0203 如果新深度值小于或等于存储值,则通过 depthFunctionstencilFunction 指定深度或模板测试。
GREATER 0x0204 Passed to depthFunction or stencilFunction to specify depth or stencil tests will pass if the new depth value is greater than the stored value.
GEQUAL 0x0206 Passed to depthFunction or stencilFunction to specify depth or stencil tests will pass if the new depth value is greater than or equal to the stored value.
NOTEQUAL 0x0205 Passed to depthFunction or stencilFunction to specify depth or stencil tests will pass if the new depth value is not equal to the stored value.

Stencil actions

Constants passed to WebGLRenderingContext.stencilOp().

Constant name Value Description
KEEP 0x1E00
REPLACE 0x1E01
INCR 0x1E02
DECR 0x1E03
INVERT 0x150A
INCR_WRAP 0x8507
DECR_WRAP 0x8508

Textures

Constants passed to WebGLRenderingContext.texParameteri(), WebGLRenderingContext.texParameterf(), WebGLRenderingContext.bindTexture(), WebGLRenderingContext.texImage2D(), and others.

Constant name Value Description
NEAREST 0x2600
LINEAR 0x2601
NEAREST_MIPMAP_NEAREST 0x2700
LINEAR_MIPMAP_NEAREST 0x2701
NEAREST_MIPMAP_LINEAR 0x2702
LINEAR_MIPMAP_LINEAR 0x2703
TEXTURE_MAG_FILTER 0x2800
TEXTURE_MIN_FILTER 0x2801
TEXTURE_WRAP_S 0x2802
TEXTURE_WRAP_T 0x2803
TEXTURE_2D 0x0DE1
TEXTURE 0x1702
TEXTURE_CUBE_MAP 0x8513
TEXTURE_BINDING_CUBE_MAP 0x8514
TEXTURE_CUBE_MAP_POSITIVE_X 0x8515
TEXTURE_CUBE_MAP_NEGATIVE_X 0x8516
TEXTURE_CUBE_MAP_POSITIVE_Y 0x8517
TEXTURE_CUBE_MAP_NEGATIVE_Y 0x8518
TEXTURE_CUBE_MAP_POSITIVE_Z 0x8519
TEXTURE_CUBE_MAP_NEGATIVE_Z 0x851A
MAX_CUBE_MAP_TEXTURE_SIZE 0x851C
TEXTURE0 - 31 0x84C0 - 0x84DF A texture unit.
ACTIVE_TEXTURE 0x84E0 The current active texture unit.
REPEAT 0x2901
CLAMP_TO_EDGE 0x812F
MIRRORED_REPEAT 0x8370

Uniform types

Constant name Value Description
FLOAT_VEC2 0x8B50
FLOAT_VEC3 0x8B51
FLOAT_VEC4 0x8B52
INT_VEC2 0x8B53
INT_VEC3 0x8B54
INT_VEC4 0x8B55
BOOL 0x8B56
BOOL_VEC2 0x8B57
BOOL_VEC3 0x8B58
BOOL_VEC4 0x8B59
FLOAT_MAT2 0x8B5A
FLOAT_MAT3 0x8B5B
FLOAT_MAT4 0x8B5C
SAMPLER_2D 0x8B5E
SAMPLER_CUBE 0x8B60

Shader precision-specified types

Constant name Value Description
LOW_FLOAT 0x8DF0
MEDIUM_FLOAT 0x8DF1
HIGH_FLOAT 0x8DF2
LOW_INT 0x8DF3
MEDIUM_INT 0x8DF4
HIGH_INT 0x8DF5

Framebuffers and renderbuffers

Constant name Value Description
FRAMEBUFFER 0x8D40
RENDERBUFFER 0x8D41
RGBA4 0x8056
RGB5_A1 0x8057
RGB565 0x8D62
DEPTH_COMPONENT16 0x81A5
STENCIL_INDEX 0x1901
STENCIL_INDEX8 0x8D48
DEPTH_STENCIL 0x84F9
RENDERBUFFER_WIDTH 0x8D42
RENDERBUFFER_HEIGHT 0x8D43
RENDERBUFFER_INTERNAL_FORMAT 0x8D44
RENDERBUFFER_RED_SIZE 0x8D50
RENDERBUFFER_GREEN_SIZE 0x8D51
RENDERBUFFER_BLUE_SIZE 0x8D52
RENDERBUFFER_ALPHA_SIZE 0x8D53
RENDERBUFFER_DEPTH_SIZE 0x8D54
RENDERBUFFER_STENCIL_SIZE 0x8D55
FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE 0x8CD0
FRAMEBUFFER_ATTACHMENT_OBJECT_NAME 0x8CD1
FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL 0x8CD2
FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACE 0x8CD3
COLOR_ATTACHMENT0 0x8CE0
DEPTH_ATTACHMENT 0x8D00
STENCIL_ATTACHMENT 0x8D20
DEPTH_STENCIL_ATTACHMENT 0x821A
NONE 0
FRAMEBUFFER_COMPLETE 0x8CD5
FRAMEBUFFER_INCOMPLETE_ATTACHMENT 0x8CD6
FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT 0x8CD7
FRAMEBUFFER_INCOMPLETE_DIMENSIONS 0x8CD9
FRAMEBUFFER_UNSUPPORTED 0x8CDD
FRAMEBUFFER_BINDING 0x8CA6
RENDERBUFFER_BINDING 0x8CA7
MAX_RENDERBUFFER_SIZE 0x84E8
INVALID_FRAMEBUFFER_OPERATION 0x0506

Pixel storage modes

Constants passed to WebGLRenderingContext.pixelStorei().

Constant name Value Description
UNPACK_FLIP_Y_WEBGL 0x9240
UNPACK_PREMULTIPLY_ALPHA_WEBGL 0x9241
UNPACK_COLORSPACE_CONVERSION_WEBGL 0x9243

Additional constants defined WebGL 2

These constants are defined on the WebGL2RenderingContext interface. All WebGL 1 constants are also available in a WebGL 2 context.

Getting GL parameter information

Constants passed to WebGLRenderingContext.getParameter() to specify what information to return.

Constant name Value Description
READ_BUFFER 0x0C02
UNPACK_ROW_LENGTH 0x0CF2
UNPACK_SKIP_ROWS 0x0CF3
UNPACK_SKIP_PIXELS 0x0CF4
PACK_ROW_LENGTH 0x0D02
PACK_SKIP_ROWS 0x0D03
PACK_SKIP_PIXELS 0x0D04
TEXTURE_BINDING_3D 0x806A
UNPACK_SKIP_IMAGES 0x806D
UNPACK_IMAGE_HEIGHT 0x806E
MAX_3D_TEXTURE_SIZE 0x8073
MAX_ELEMENTS_VERTICES 0x80E8
MAX_ELEMENTS_INDICES 0x80E9
MAX_TEXTURE_LOD_BIAS 0x84FD
MAX_FRAGMENT_UNIFORM_COMPONENTS 0x8B49
MAX_VERTEX_UNIFORM_COMPONENTS 0x8B4A
MAX_ARRAY_TEXTURE_LAYERS 0x88FF
MIN_PROGRAM_TEXEL_OFFSET 0x8904
MAX_PROGRAM_TEXEL_OFFSET 0x8905
MAX_VARYING_COMPONENTS 0x8B4B
FRAGMENT_SHADER_DERIVATIVE_HINT 0x8B8B
RASTERIZER_DISCARD 0x8C89
VERTEX_ARRAY_BINDING 0x85B5
MAX_VERTEX_OUTPUT_COMPONENTS 0x9122
MAX_FRAGMENT_INPUT_COMPONENTS 0x9125
MAX_SERVER_WAIT_TIMEOUT 0x9111
MAX_ELEMENT_INDEX 0x8D6B

Textures

Constants passed to WebGLRenderingContext.texParameteri(), WebGLRenderingContext.texParameterf(), WebGLRenderingContext.bindTexture(), WebGLRenderingContext.texImage2D(), and others.

Constant name Value Description
RED 0x1903
RGB8 0x8051
RGBA8 0x8058
RGB10_A2 0x8059
TEXTURES_3D 0x806F
TEXTURE_WRAP_R 0x8072
TEXTURE_MIN_LOD 0x813A
TEXTURE_MAX_LOD 0x813B
TEXTURE_BASE_LEVEL 0x813C
TEXTURE_MAX_LEVEL 0x813D
TEXTURE_COMPARE_MODE 0x884C
TEXTURE_COMPARE_FUNC 0x884D
SRGB 0x8C40
SRGB8 0x8C41
SRGB8_ALPHA8 0x8C43
COMPARE_REF_TO_TEXTURE 0x884E
RGBA32F 0x8814
RGB32F 0x8815
RGBA16F 0x881A
RGB16F 0x881B
TEXTURE_2D_ARRAY 0x8C1A
TEXTURE_BINDING_2D_ARRAY 0x8C1D
R11F_G11F_B10F 0x8C3A
RGB9_E5 0x8C3D
RGBA32UI 0x8D70
RGB32UI 0x8D71
RGBA16UI 0x8D76
RGB16UI 0x8D77
RGBA8UI 0x8D7C
RGB8UI 0x8D7D
RGBA32I 0x8D82
RGB32I 0x8D83
RGBA16I 0x8D88
RGB16I 0x8D89
RGBA8I 0x8D8E
RGB8I 0x8D8F
RED_INTEGER 0x8D94
RGB_INTEGER 0x8D98
RGBA_INTEGER 0x8D99
R8 0x8229
RG8 0x822B
R16F 0x822D
R32F 0x822E
RG16F 0x822F
RG32F 0x8230
R8I 0x8231
R8UI 0x8232
R16I 0x8233
R16UI 0x8234
R32I 0x8235
R32UI 0x8236
RG8I 0x8237
RG8UI 0x8238
RG16I 0x8239
RG16UI 0x823A
RG32I 0x823B
RG32UI 0x823C
R8_SNORM 0x8F94
RG8_SNORM 0x8F95
RGB8_SNORM 0x8F96
RGBA8_SNORM 0x8F97
RGB10_A2UI 0x906F
COMPRESSED_R11_EAC 0x9270
COMPRESSED_SIGNED_R11_EAC 0x9271
COMPRESSED_RG11_EAC 0x9272
COMPRESSED_SIGNED_RG11_EAC 0x9273
COMPRESSED_RGB8_ETC2 0x9274
COMPRESSED_SRGB8_ETC2 0x9275
COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2 0x9276
COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC 0x9277
COMPRESSED_RGBA8_ETC2_EAC 0x9278
COMPRESSED_SRGB8_ALPHA8_ETC2_EAC 0x9279
TEXTURE_IMMUTABLE_FORMAT 0x912F
TEXTURE_IMMUTABLE_LEVELS 0x82DF

Pixel types

Constant name Value Description
UNSIGNED_INT_2_10_10_10_REV 0x8368
UNSIGNED_INT_10F_11F_11F_REV 0x8C3B
UNSIGNED_INT_5_9_9_9_REV 0x8C3E
FLOAT_32_UNSIGNED_INT_24_8_REV 0x8DAD
UNSIGNED_INT_24_8 0x84FA
HALF_FLOAT 0x140B
RG 0x8227
RG_INTEGER 0x8228
INT_2_10_10_10_REV 0x8D9F

Queries

Constant name Value Description
CURRENT_QUERY 0x8865
QUERY_RESULT 0x8866
QUERY_RESULT_AVAILABLE 0x8867
ANY_SAMPLES_PASSED 0x8C2F
ANY_SAMPLES_PASSED_CONSERVATIVE 0x8D6A

Draw buffers

Constant name Value Description
MAX_DRAW_BUFFERS 0x8824
DRAW_BUFFER0 0x8825
DRAW_BUFFER1 0x8826
DRAW_BUFFER2 0x8827
DRAW_BUFFER3 0x8828
DRAW_BUFFER4 0x8829
DRAW_BUFFER5 0x882A
DRAW_BUFFER6 0x882B
DRAW_BUFFER7 0x882C
DRAW_BUFFER8 0x882D
DRAW_BUFFER9 0x882E
DRAW_BUFFER10 0x882F
DRAW_BUFFER11 0x8830
DRAW_BUFFER12 0x8831
DRAW_BUFFER13 0x8832
DRAW_BUFFER14 0x8833
DRAW_BUFFER15 0x8834
MAX_COLOR_ATTACHMENTS 0x8CDF
COLOR_ATTACHMENT1 0x8CE1
COLOR_ATTACHMENT2 0x8CE2
COLOR_ATTACHMENT3 0x8CE3
COLOR_ATTACHMENT4 0x8CE4
COLOR_ATTACHMENT5 0x8CE5
COLOR_ATTACHMENT6 0x8CE6
COLOR_ATTACHMENT7 0x8CE7
COLOR_ATTACHMENT8 0x8CE8
COLOR_ATTACHMENT9 0x8CE9
COLOR_ATTACHMENT10 0x8CEA
COLOR_ATTACHMENT11 0x8CEB
COLOR_ATTACHMENT12 0x8CEC
COLOR_ATTACHMENT13 0x8CED
COLOR_ATTACHMENT14 0x8CEE
COLOR_ATTACHMENT15 0x8CEF

Samplers

Constant name Value Description
SAMPLER_3D 0x8B5F
SAMPLER_2D_SHADOW 0x8B62
SAMPLER_2D_ARRAY 0x8DC1
SAMPLER_2D_ARRAY_SHADOW 0x8DC4
SAMPLER_CUBE_SHADOW 0x8DC5
INT_SAMPLER_2D 0x8DCA
INT_SAMPLER_3D 0x8DCB
INT_SAMPLER_CUBE 0x8DCC
INT_SAMPLER_2D_ARRAY 0x8DCF
UNSIGNED_INT_SAMPLER_2D 0x8DD2
UNSIGNED_INT_SAMPLER_3D 0x8DD3
UNSIGNED_INT_SAMPLER_CUBE 0x8DD4
UNSIGNED_INT_SAMPLER_2D_ARRAY 0x8DD7
MAX_SAMPLES 0x8D57
SAMPLER_BINDING 0x8919

Buffers

Constant name Value Description
PIXEL_PACK_BUFFER 0x88EB
PIXEL_UNPACK_BUFFER 0x88EC
PIXEL_PACK_BUFFER_BINDING 0x88ED
PIXEL_UNPACK_BUFFER_BINDING 0x88EF
COPY_READ_BUFFER 0x8F36
COPY_WRITE_BUFFER 0x8F37
COPY_READ_BUFFER_BINDING 0x8F36
COPY_WRITE_BUFFER_BINDING 0x8F37

Data types

Constant name Value Description
FLOAT_MAT2x3 0x8B65
FLOAT_MAT2x4 0x8B66
FLOAT_MAT3x2 0x8B67
FLOAT_MAT3x4 0x8B68
FLOAT_MAT4x2 0x8B69
FLOAT_MAT4x3 0x8B6A
UNSIGNED_INT_VEC2 0x8DC6
UNSIGNED_INT_VEC3 0x8DC7
UNSIGNED_INT_VEC4 0x8DC8
UNSIGNED_NORMALIZED 0x8C17
SIGNED_NORMALIZED 0x8F9C

Vertex attributes

Constant name Value Description
VERTEX_ATTRIB_ARRAY_INTEGER 0x88FD
VERTEX_ATTRIB_ARRAY_DIVISOR 0x88FE

Transform feedback

Constant name Value Description
TRANSFORM_FEEDBACK_BUFFER_MODE 0x8C7F
MAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTS 0x8C80
TRANSFORM_FEEDBACK_VARYINGS 0x8C83
TRANSFORM_FEEDBACK_BUFFER_START 0x8C84
TRANSFORM_FEEDBACK_BUFFER_SIZE 0x8C85
TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN 0x8C88
MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS 0x8C8A
MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS 0x8C8B
INTERLEAVED_ATTRIBS 0x8C8C
SEPARATE_ATTRIBS 0x8C8D
TRANSFORM_FEEDBACK_BUFFER 0x8C8E
TRANSFORM_FEEDBACK_BUFFER_BINDING 0x8C8F
TRANSFORM_FEEDBACK 0x8E22
TRANSFORM_FEEDBACK_PAUSED 0x8E23
TRANSFORM_FEEDBACK_ACTIVE 0x8E24
TRANSFORM_FEEDBACK_BINDING 0x8E25

Framebuffers and renderbuffers

Constant name Value Description
FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING 0x8210
FRAMEBUFFER_ATTACHMENT_COMPONENT_TYPE 0x8211
FRAMEBUFFER_ATTACHMENT_RED_SIZE 0x8212
FRAMEBUFFER_ATTACHMENT_GREEN_SIZE 0x8213
FRAMEBUFFER_ATTACHMENT_BLUE_SIZE 0x8214
FRAMEBUFFER_ATTACHMENT_ALPHA_SIZE 0x8215
FRAMEBUFFER_ATTACHMENT_DEPTH_SIZE 0x8216
FRAMEBUFFER_ATTACHMENT_STENCIL_SIZE 0x8217
FRAMEBUFFER_DEFAULT 0x8218
DEPTH_STENCIL_ATTACHMENT 0x821A
DEPTH_STENCIL 0x84F9
DEPTH24_STENCIL8 0x88F0
DRAW_FRAMEBUFFER_BINDING 0x8CA6
READ_FRAMEBUFFER 0x8CA8
DRAW_FRAMEBUFFER 0x8CA9
READ_FRAMEBUFFER_BINDING 0x8CAA
RENDERBUFFER_SAMPLES 0x8CAB
FRAMEBUFFER_ATTACHMENT_TEXTURE_LAYER 0x8CD4
FRAMEBUFFER_INCOMPLETE_MULTISAMPLE 0x8D56

Uniforms

Constant name Value Description
UNIFORM_BUFFER 0x8A11
UNIFORM_BUFFER_BINDING 0x8A28
UNIFORM_BUFFER_START 0x8A29
UNIFORM_BUFFER_SIZE 0x8A2A
MAX_VERTEX_UNIFORM_BLOCKS 0x8A2B
MAX_FRAGMENT_UNIFORM_BLOCKS 0x8A2D
MAX_COMBINED_UNIFORM_BLOCKS 0x8A2E
MAX_UNIFORM_BUFFER_BINDINGS 0x8A2F
MAX_UNIFORM_BLOCK_SIZE 0x8A30
MAX_COMBINED_VERTEX_UNIFORM_COMPONENTS 0x8A31
MAX_COMBINED_FRAGMENT_UNIFORM_COMPONENTS 0x8A33
UNIFORM_BUFFER_OFFSET_ALIGNMENT 0x8A34
ACTIVE_UNIFORM_BLOCKS 0x8A36
UNIFORM_TYPE 0x8A37
UNIFORM_SIZE 0x8A38
UNIFORM_BLOCK_INDEX 0x8A3A
UNIFORM_OFFSET 0x8A3B
UNIFORM_ARRAY_STRIDE 0x8A3C
UNIFORM_MATRIX_STRIDE 0x8A3D
UNIFORM_IS_ROW_MAJOR 0x8A3E
UNIFORM_BLOCK_BINDING 0x8A3F
UNIFORM_BLOCK_DATA_SIZE 0x8A40
UNIFORM_BLOCK_ACTIVE_UNIFORMS 0x8A42
UNIFORM_BLOCK_ACTIVE_UNIFORM_INDICES 0x8A43
UNIFORM_BLOCK_REFERENCED_BY_VERTEX_SHADER 0x8A44
UNIFORM_BLOCK_REFERENCED_BY_FRAGMENT_SHADER 0x8A46

Sync objects

Constant name Value Description
OBJECT_TYPE 0x9112
SYNC_CONDITION 0x9113
SYNC_STATUS 0x9114
SYNC_FLAGS 0x9115
SYNC_FENCE 0x9116
SYNC_GPU_COMMANDS_COMPLETE 0x9117
UNSIGNALED 0x9118
SIGNALED 0x9119
ALREADY_SIGNALED 0x911A
TIMEOUT_EXPIRED 0x911B
CONDITION_SATISFIED 0x911C
WAIT_FAILED 0x911D
SYNC_FLUSH_COMMANDS_BIT 0x00000001

Miscellaneous constants

Constant name Value Description
COLOR 0x1800
DEPTH 0x1801
STENCIL 0x1802
MIN 0x8007
MAX 0x8008
DEPTH_COMPONENT24 0x81A6
STREAM_READ 0x88E1
STREAM_COPY 0x88E2
STATIC_READ 0x88E5
STATIC_COPY 0x88E6
DYNAMIC_READ 0x88E9
DYNAMIC_COPY 0x88EA
DEPTH_COMPONENT32F 0x8CAC
DEPTH32F_STENCIL8 0x8CAD
INVALID_INDEX 0xFFFFFFFF
TIMEOUT_IGNORED -1
MAX_CLIENT_WAIT_TIMEOUT_WEBGL 0x9247

Constants defined in WebGL extensions

ANGLE_instanced_arrays

Constant name Value Description
VERTEX_ATTRIB_ARRAY_DIVISOR_ANGLE 0x88FE Describes the frequency divisor used for instanced rendering.

WEBGL_debug_renderer_info

Constant name Value Description
UNMASKED_VENDOR_WEBGL 0x9245 Passed to getParameter to get the vendor string of the graphics driver.
UNMASKED_RENDERER_WEBGL 0x9246 Passed to getParameter to get the renderer string of the graphics driver.

EXT_texture_filter_anisotropic

Constant name Value Description
MAX_TEXTURE_MAX_ANISOTROPY_EXT 0x84FF Returns the maximum available anisotropy.
TEXTURE_MAX_ANISOTROPY_EXT 0x84FE Passed to texParameter to set the desired maximum anisotropy for a texture.

WEBGL_compressed_texture_s3tc

Constant name Value Description
COMPRESSED_RGB_S3TC_DXT1_EXT 0x83F0 A DXT1-compressed image in an RGB image format.
COMPRESSED_RGBA_S3TC_DXT1_EXT 0x83F1 A DXT1-compressed image in an RGB image format with a simple on/off alpha value.
COMPRESSED_RGBA_S3TC_DXT3_EXT 0x83F2 A DXT3-compressed image in an RGBA image format. Compared to a 32-bit RGBA texture, it offers 4:1 compression.
COMPRESSED_RGBA_S3TC_DXT5_EXT 0x83F3 A DXT5-compressed image in an RGBA image format. It also provides a 4:1 compression, but differs to the DXT3 compression in how the alpha compression is done.

WEBGL_compressed_texture_es3

Constant name Value Description
COMPRESSED_R11_EAC 0x9270 One-channel (red) unsigned format compression.
COMPRESSED_SIGNED_R11_EAC 0x9271 One-channel (red) signed format compression.
COMPRESSED_RG11_EAC 0x9272 Two-channel (red and green) unsigned format compression.
COMPRESSED_SIGNED_RG11_EAC 0x9273 Two-channel (red and green) signed format compression.
COMPRESSED_RGB8_ETC2 0x9274 Compresses RBG8 data with no alpha channel.
COMPRESSED_RGBA8_ETC2_EAC 0x9275 Compresses RGBA8 data. The RGB part is encoded the same as RGB_ETC2, but the alpha part is encoded separately.
COMPRESSED_SRGB8_ETC2 0x9276 Compresses sRBG8 data with no alpha channel.
COMPRESSED_SRGB8_ALPHA8_ETC2_EAC 0x9277 Compresses sRGBA8 data. The sRGB part is encoded the same as SRGB_ETC2, but the alpha part is encoded separately.
COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2 0x9278 Similar to RGB8_ETC, but with ability to punch through the alpha channel, which means to make it completely opaque or transparent.
COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2 0x9279 Similar to SRGB8_ETC, but with ability to punch through the alpha channel, which means to make it completely opaque or transparent.

WEBGL_compressed_texture_pvrtc

Constant name Value Description
COMPRESSED_RGB_PVRTC_4BPPV1_IMG 0x8C00 RGB compression in 4-bit mode. One block for each 4×4 pixels.
COMPRESSED_RGBA_PVRTC_4BPPV1_IMG 0x8C02 RGBA compression in 4-bit mode. One block for each 4×4 pixels.
COMPRESSED_RGB_PVRTC_2BPPV1_IMG 0x8C01 RGB compression in 2-bit mode. One block for each 8×4 pixels.
COMPRESSED_RGBA_PVRTC_2BPPV1_IMG 0x8C03 RGBA compression in 2-bit mode. One block for each 8×4 pixe

WEBGL_compressed_texture_etc1

Constant name Value Description
COMPRESSED_RGB_ETC1_WEBGL 0x8D64 Compresses 24-bit RGB data with no alpha channel.

WEBGL_compressed_texture_atc

Constant name Value Description
COMPRESSED_RGB_ATC_WEBGL 0x8C92 Compresses RGB textures with no alpha channel.
COMPRESSED_RGBA_ATC_EXPLICIT_ALPHA_WEBGL 0x8C92 Compresses RGBA textures using explicit alpha encoding (useful when alpha transitions are sharp).
COMPRESSED_RGBA_ATC_INTERPOLATED_ALPHA_WEBGL 0x87EE Compresses RGBA textures using interpolated alpha encoding (useful when alpha transitions are gradient).

WEBGL_depth_texture

Constant name Value Description
UNSIGNED_INT_24_8_WEBGL 0x84FA Unsigned integer type for 24-bit depth texture data.

OES_texture_half_float

Constant name Value Description
HALF_FLOAT_OES 0x8D61 Half floating-point type (16-bit).

WEBGL_color_buffer_float

Constant name Value Description
RGBA32F_EXT 0x8814 RGBA 32-bit floating-point color-renderable format.
RGB32F_EXT 0x8815 RGB 32-bit floating-point color-renderable format.
FRAMEBUFFER_ATTACHMENT_COMPONENT_TYPE_EXT 0x8211
UNSIGNED_NORMALIZED_EXT 0x8C17

EXT_blend_minmax

Constant name Value Description
MIN_EXT 0x8007 Produces the minimum color components of the source and destination colors.
MAX_EXT 0x8008 Produces the maximum color components of the source and destination colors.

EXT_sRGB

Constant name Value Description
SRGB_EXT 0x8C40 Unsized sRGB format that leaves the precision up to the driver.
SRGB_ALPHA_EXT 0x8C42 Unsized sRGB format with unsized alpha component.
SRGB8_ALPHA8_EXT 0x8C43 Sized (8-bit) sRGB and alpha formats.
FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING_EXT 0x8210 Returns the framebuffer color encoding.

OES_standard_derivatives

Constant name Value Description
FRAGMENT_SHADER_DERIVATIVE_HINT_OES 0x8B8B Indicates the accuracy of the derivative calculation for the GLSL built-in functions: dFdx, dFdy, and fwidth.

WEBGL_draw_buffers

Constant name Value Description
COLOR_ATTACHMENT0_WEBGL 0x8CE0 Framebuffer color attachment point
COLOR_ATTACHMENT1_WEBGL 0x8CE1 Framebuffer color attachment point
COLOR_ATTACHMENT2_WEBGL 0x8CE2 Framebuffer color attachment point
COLOR_ATTACHMENT3_WEBGL 0x8CE3 Framebuffer color attachment point
COLOR_ATTACHMENT4_WEBGL 0x8CE4 Framebuffer color attachment point
COLOR_ATTACHMENT5_WEBGL 0x8CE5 Framebuffer color attachment point
COLOR_ATTACHMENT6_WEBGL 0x8CE6 Framebuffer color attachment point
COLOR_ATTACHMENT7_WEBGL 0x8CE7 Framebuffer color attachment point
COLOR_ATTACHMENT8_WEBGL 0x8CE8 Framebuffer color attachment point
COLOR_ATTACHMENT9_WEBGL 0x8CE9 Framebuffer color attachment point
COLOR_ATTACHMENT10_WEBGL 0x8CEA Framebuffer color attachment point
COLOR_ATTACHMENT11_WEBGL 0x8CEB Framebuffer color attachment point
COLOR_ATTACHMENT12_WEBGL 0x8CEC Framebuffer color attachment point
COLOR_ATTACHMENT13_WEBGL 0x8CED Framebuffer color attachment point
COLOR_ATTACHMENT14_WEBGL 0x8CEE Framebuffer color attachment point
COLOR_ATTACHMENT15_WEBGL 0x8CEF Framebuffer color attachment point
DRAW_BUFFER0_WEBGL 0x8825 Draw buffer
DRAW_BUFFER1_WEBGL 0x8826 Draw buffer
DRAW_BUFFER2_WEBGL 0x8827 Draw buffer
DRAW_BUFFER3_WEBGL 0x8828 Draw buffer
DRAW_BUFFER4_WEBGL 0x8829 Draw buffer
DRAW_BUFFER5_WEBGL 0x882A Draw buffer
DRAW_BUFFER6_WEBGL 0x882B Draw buffer
DRAW_BUFFER7_WEBGL 0x882C Draw buffer
DRAW_BUFFER8_WEBGL 0x882D Draw buffer
DRAW_BUFFER9_WEBGL 0x882E Draw buffer
DRAW_BUFFER10_WEBGL 0x882F Draw buffer
DRAW_BUFFER11_WEBGL 0x8830 Draw buffer
DRAW_BUFFER12_WEBGL 0x8831 Draw buffer
DRAW_BUFFER13_WEBGL 0x8832 Draw buffer
DRAW_BUFFER14_WEBGL 0x8833 Draw buffer
DRAW_BUFFER15_WEBGL 0x8834 Draw buffer
MAX_COLOR_ATTACHMENTS_WEBGL 0x8CDF Maximum number of framebuffer color attachment points
MAX_DRAW_BUFFERS_WEBGL 0x8824 Maximum number of draw buffers

OES_vertex_array_object

Constant name Value Description
VERTEX_ARRAY_BINDING_OES 0x85B5 The bound vertex array object (VAO).

EXT_disjoint_timer_query

Constant name Value Description
QUERY_COUNTER_BITS_EXT 0x8864 The number of bits used to hold the query result for the given target.
CURRENT_QUERY_EXT 0x8865 The currently active query.
QUERY_RESULT_EXT 0x8866 The query result.
QUERY_RESULT_AVAILABLE_EXT 0x8867 A Boolean indicating whether or not a query result is available.
TIME_ELAPSED_EXT 0x88BF Elapsed time (in nanoseconds).
TIMESTAMP_EXT 0x8E28 The current time.
GPU_DISJOINT_EXT 0x8FBB A Boolean indicating whether or not the GPU performed any disjoint operation.

Specifications

Specification Status Comment
WebGL 1.0
WebGLRenderingContext
Recommendation Initial definition
WebGL 2.0
WebGL2RenderingContext
Editor's Draft Defines additional constants.

浏览器兼容性

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!
Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support 9 4.0 (2.0) 11 12 5.1
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support ? 25 (Yes) ? 12 8.1

See also

文档标签和贡献者

最后编辑者: xuhbd,