WebGL 相关常量

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（WebGLRenderingContext和WebGL2RenderingContext）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
标准 WebGL 2 常量
WebGL 扩展常量

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	值	说明
`DEPTH_BUFFER_BIT`	0x00000100	用来清除深度缓冲
`STENCIL_BUFFER_BIT`	0x00000400	用来清除当前模板缓冲区。
`COLOR_BUFFER_BIT`	0x00004000	用来清除颜色缓冲

指定渲染图元 Rendering primitives

Constants passed to WebGLRenderingContext.drawElements() or WebGLRenderingContext.drawArrays() to specify what kind of primitive to render.

常量名称	值	说明
`POINTS`	0x0000	Passed to `drawElements` or `drawArrays` to draw single points.
`LINES`	0x0001	Passed to `drawElements` or `drawArrays` to draw lines. Each vertex connects to the one after it.
`LINE_LOOP`	0x0002	Passed to `drawElements` or `drawArrays` to draw lines. Each set of two vertices is treated as a separate line segment.
`LINE_STRIP`	0x0003	Passed to `drawElements` or `drawArrays` to draw a connected group of line segments from the first vertex to the last.
`TRIANGLES`	0x0004	Passed to `drawElements` or `drawArrays` to draw triangles. Each set of three vertices creates a separate triangle.
`TRIANGLE_STRIP`	0x0005	Passed to `drawElements` or `drawArrays` to draw a connected group of triangles.
`TRIANGLE_FAN`	0x0006	Passed to `drawElements` or `drawArrays` to draw a connected group of triangles. Each vertex connects to the previous and the first vertex in the fan.

Blending modes

Constants passed to WebGLRenderingContext.blendFunc() or WebGLRenderingContext.blendFuncSeparate() to specify the blending mode (for both, RBG and alpha, or separately).

常量名称	值	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	值	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	值	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	值	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	值	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	值	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	值	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	Passed to `enable`/`disable` to turn on/off the depth test. Can also be used with `getParameter` to query the depth test.
`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	值	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	值	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	值	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	值	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	值	说明
`DEPTH_COMPONENT`	0x1902
`ALPHA`	0x1906
`RGB`	0x1907
`RGBA`	0x1908
`LUMINANCE`	0x1909
`LUMINANCE_ALPHA`	0x190A

Pixel types

常量名称	值	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	值	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	Passed to `depthFunction` or `stencilFunction` to specify depth or stencil tests will pass if the new depth value is less than or equal to the stored value.
`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.

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

WebGL 相关常量

常量表

标准 WebGL 1 常量

清除缓存

指定渲染图元 Rendering primitives

Blending modes

Blending equations

Getting GL parameter information

Buffers

Vertex attributes

Culling

Enabling and disabling

Errors

Front face directions

Hints

Data types

Pixel formats

Pixel types

Shaders

Depth or stencil tests

Stencil actions

Textures

Uniform types

Shader precision-specified types

Framebuffers and renderbuffers

Pixel storage modes

Additional constants defined WebGL 2

Getting GL parameter information

Textures

Pixel types

Queries

Draw buffers

Samplers

Buffers

Data types

Vertex attributes

Transform feedback

Framebuffers and renderbuffers

Uniforms

Sync objects

Miscellaneous constants

Constants defined in WebGL extensions

Specifications

Browser compatibility

See also

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