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WebGL 相关常量 - Web API 接口参考 编辑

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

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_BIT0x00000100传递给 clear 来清除深度缓冲区。
STENCIL_BUFFER_BIT0x00000400传递给 clear 来清除当前模板缓冲区。
COLOR_BUFFER_BIT0x00004000传递给 clear 来清除颜色缓冲区。

指定渲染图元 Rendering primitives

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

常量名称值说明
POINTS0x0000传递给 drawElements 或drawArrays 画点。
LINES0x0001传递给  drawElements 或drawArrays 画线段。 每个顶点链接到它的下一个顶点。每两点画一条线段。
LINE_LOOP0x0002传递给  drawElements 或drawArrays 画回路。 每两个点被当作是一条独立的线段。线段首尾相连。
LINE_STRIP0x0003传递给  drawElements 或drawArrays 画一个从第一个顶点到最后一个顶点绘制一组相连的线段。
TRIANGLES0x0004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_STRIP0x0005传递给drawElements或drawArrays 画一组相连的三角形带。
TRIANGLE_FAN0x0006

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第一个顶点（类似风扇）。

混合模式

传递给 WebGLRenderingContext.blendFunc() 或WebGLRenderingContext.blendFuncSeparate() 的常量来指定混合模式 (同时用于或分别用于RBG和alpha).

常量名称值说明
ZERO0传递给blendFunc 或 blendFuncSeparate 以关闭分量。
ONE1传递给 blendFunc 或 blendFuncSeparate 以打开分量。
SRC_COLOR0x0300传递给 blendFunc 或 blendFuncSeparate 以将分量乘以源元素颜色分量。
ONE_MINUS_SRC_COLOR0x0301传递给 blendFunc 或 blendFuncSeparate 以将分量乘以1 减去源颜色分量。
SRC_ALPHA0x0302传递给 blendFunc 或 blendFuncSeparate 以将分量乘以源颜色的 alpha值。
ONE_MINUS_SRC_ALPHA0x0303传递给 blendFunc 或 blendFuncSeparate 以将分量乘以一个源颜色的 alpha值。
DST_ALPHA0x0304传递给 blendFunc 或 blendFuncSeparate 以将分量乘以目标颜色的alpha值。
ONE_MINUS_DST_ALPHA0x0305传递给 blendFunc 或 blendFuncSeparate 以将分量乘以1减去目标颜色的alpha值。
DST_COLOR0x0306传递给 blendFunc 或 blendFuncSeparate 以将分量乘以目标颜色分量。
ONE_MINUS_DST_COLOR0x0307传递给 blendFunc 或 blendFuncSeparate 以将分量乘以1减去目标颜色分量。
SRC_ALPHA_SATURATE0x0308传递给 blendFunc 或 blendFuncSeparate 以将分量乘以源颜色alpha与目标颜色alpha中的最小值。
CONSTANT_COLOR0x8001传递给 blendFunc 或 blendFuncSeparate 以指定常量颜色的混合函数。
ONE_MINUS_CONSTANT_COLOR0x8002传递给 blendFunc 或 blendFuncSeparate 以指定1减去常量颜色的混合函数。
CONSTANT_ALPHA0x8003传递给 blendFunc 或 blendFuncSeparate 以指定常量alpha混合函数。
ONE_MINUS_CONSTANT_ALPHA0x8004传递给 blendFunc 或 blendFuncSeparate 以指定1减去一个常量alpha的混合函数。

混合方程

传递给 WebGLRenderingContext.blendEquation() 或 WebGLRenderingContext.blendEquationSeparate() 的常量，以控制混合的计算方式（同时用于或分别用于RBG和alpha）。

常量名称值说明
FUNC_ADD0x8006传递给 blendEquation 或 blendEquationSeparate 来设置加法混合函数。
FUNC_SUBSTRACT0x800A传递给 blendEquation 或 blendEquationSeparate 来指定减法混合函数（源 - 目标）
FUNC_REVERSE_SUBTRACT0x800B传递给 blendEquation 或 blendEquationSeparate 指定反向减法函数（目标 - 源）

获取 GL 参数信息

传递给 WebGLRenderingContext.getParameter() 的常量，用以指定要返回的信息。 

常量名称值说明
BLEND_EQUATION0x8009传递给 getParameter 以获取当前的RGB混合函数。
BLEND_EQUATION_RGB0x8009传递给 getParameter 以获取当前的RGB混合函数。与 BLEND_EQUATION 相同。
BLEND_EQUATION_ALPHA0x883D传递给 getParameter 以获取当前的alpha函数。与 BLEND_EQUATION 相同。
BLEND_DST_RGB0x80C8传递给 getParameter 以获取当前的目标RGB混合函数。
BLEND_SRC_RGB0x80C9传递给 getParameter 以获取当前的源RGB混合函数。
BLEND_DST_ALPHA0x80CA传递给 getParameter 以获取当前目标的alpha混合函数。
BLEND_SRC_ALPHA0x80CB传递给 getParameter 以获取当前的源alpha混合函数。
BLEND_COLOR0x8005传递给 getParameter 以返回当前的混合颜色。
ARRAY_BUFFER_BINDING0x8894传递给 getParameter 获取数组缓冲区绑定。
ELEMENT_ARRAY_BUFFER_BINDING0x8895传递给 getParameter 获取当前元素数组缓冲区。
LINE_WIDTH0x0B21传递给 getParameter 获取当前的 lineWidth (由 lineWidth 方法设置)。
ALIASED_POINT_SIZE_RANGE0x846D传递给 getParameter 获取使用 gl.POINTS 绘制的点的大小。
ALIASED_LINE_WIDTH_RANGE0x846E传递给 getParameter 得到一条线的可用宽度范围。返回一个长度为2的数组。其中低值为0，高值为1。
CULL_FACE_MODE0x0B45传递给 getParameter 获取当前的cullFace 值。 应该返回 FRONT, BACK, 或 FRONT_AND_BACK。
FRONT_FACE0x0B46传递给 getParameter 以确定当前的 frontFace 值。应该 CW 或 CCW。
DEPTH_RANGE0x0B70传递给 getParameter 返回长度为2的浮点数数组，以表示当前深度范围。
DEPTH_WRITEMASK0x0B72传递给 getParameter 确定是否启用深度缓冲区写入操作。
DEPTH_CLEAR_VALUE0x0B73传递给 getParameter 确定当前的深度清除值。
DEPTH_FUNC0x0B74传递给 getParameter 获取当前的深度函数。返回 NEVER, ALWAYS, LESS, EQUAL, LEQUAL, GREATER, GEQUAL, 或 NOTEQUAL。
STENCIL_CLEAR_VALUE0x0B91传递给 getParameter 获取将消除的模板值。
STENCIL_FUNC0x0B92传递给 getParameter 获取当前的模板函数。返回 NEVER, ALWAYS, LESS, EQUAL, LEQUAL, GREATER, GEQUAL, 或 NOTEQUAL。
STENCIL_FAIL0x0B94传递给 getParameter 获取当前模板的失效函数。应该返回 KEEP, REPLACE, INCR, DECR, INVERT, INCR_WRAP, 或 DECR_WRAP。
STENCIL_PASS_DEPTH_FAIL0x0B95如果深度缓冲区测试失败，则传递给 getParameter 以获取当前模板失败函数。应该返回 KEEP, REPLACE, INCR, DECR, INVERT, INCR_WRAP, 或 DECR_WRAP。
STENCIL_PASS_DEPTH_PASS0x0B96如果深度缓冲区测试通过，则传递给 getParameter 以获取当前模板失败函数。应该返回 KEEP, REPLACE, INCR, DECR, INVERT, INCR_WRAP, 或 DECR_WRAP。
STENCIL_REF0x0B97传递给 getParameter 获取用于模板测试的参考值。
STENCIL_VALUE_MASK0x0B93
STENCIL_WRITEMASK0x0B98
STENCIL_BACK_FUNC0x8800
STENCIL_BACK_FAIL0x8801
STENCIL_BACK_PASS_DEPTH_FAIL0x8802
STENCIL_BACK_PASS_DEPTH_PASS0x8803
STENCIL_BACK_REF0x8CA3
STENCIL_BACK_VALUE_MASK0x8CA4
STENCIL_BACK_WRITEMASK0x8CA5
VIEWPORT0x0BA2返回带有当前视口尺寸的四个元素的 Int32Array 
SCISSOR_BOX0x0C10返回带有当前裁剪盒子尺寸的四个元素的 Int32Array 。
COLOR_CLEAR_VALUE0x0C22
COLOR_WRITEMASK0x0C23
UNPACK_ALIGNMENT0x0CF5
PACK_ALIGNMENT0x0D05
MAX_TEXTURE_SIZE0x0D33
MAX_VIEWPORT_DIMS0x0D3A
SUBPIXEL_BITS0x0D50
RED_BITS0x0D52
GREEN_BITS0x0D53
BLUE_BITS0x0D54
ALPHA_BITS0x0D55
DEPTH_BITS0x0D56
STENCIL_BITS0x0D57
POLYGON_OFFSET_UNITS0x2A00
POLYGON_OFFSET_FACTOR0x8038
TEXTURE_BINDING_2D0x8069
SAMPLE_BUFFERS0x80A8
SAMPLES0x80A9
SAMPLE_COVERAGE_VALUE0x80AA
SAMPLE_COVERAGE_INVERT0x80AB
COMPRESSED_TEXTURE_FORMATS0x86A3
VENDOR0x1F00
RENDERER0x1F01
VERSION0x1F02
IMPLEMENTATION_COLOR_READ_TYPE0x8B9A
IMPLEMENTATION_COLOR_READ_FORMAT0x8B9B
BROWSER_DEFAULT_WEBGL0x9244

Buffers

传递给WebGLRenderingContext.bufferData(), WebGLRenderingContext.bufferSubData(), WebGLRenderingContext.bindBuffer(), or WebGLRenderingContext.getBufferParameter() 的变量。

常量名称值说明
STATIC_DRAW0x88E4Passed to bufferData as a hint about whether the contents of the buffer are likely to be used often and not change often.
STREAM_DRAW0x88E0Passed to bufferData as a hint about whether the contents of the buffer are likely to not be used often.
DYNAMIC_DRAW0x88E8Passed to bufferData as a hint about whether the contents of the buffer are likely to be used often and change often.
ARRAY_BUFFER0x8892Passed to bindBuffer or bufferData to specify the type of buffer being used.
ELEMENT_ARRAY_BUFFER0x8893Passed to bindBuffer or bufferData to specify the type of buffer being used.
BUFFER_SIZE0x8764Passed to getBufferParameter to get a buffer's size.
BUFFER_USAGE0x8765Passed 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_ATTRIB0x8626Passed to getVertexAttrib to read back the current vertex attribute.
VERTEX_ATTRIB_ARRAY_ENABLED0x8622
VERTEX_ATTRIB_ARRAY_SIZE0x8623
VERTEX_ATTRIB_ARRAY_STRIDE0x8624
VERTEX_ATTRIB_ARRAY_TYPE0x8625
VERTEX_ATTRIB_ARRAY_NORMALIZED0x886A
VERTEX_ATTRIB_ARRAY_POINTER0x8645
VERTEX_ATTRIB_ARRAY_BUFFER_BINDING0x889F

Culling

Constants passed to WebGLRenderingContext.cullFace().

常量名称值说明
CULL_FACE0x0B44Passed to enable/disable to turn on/off culling. Can also be used with getParameter to find the current culling method.
FRONT0x0404Passed to cullFace to specify that only front faces should be drawn.
BACK0x0405Passed to cullFace to specify that only back faces should be drawn.
FRONT_AND_BACK0x0408Passed 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
BLEND0x0BE2Passed to enable/disable to turn on/off blending. Can also be used with getParameter to find the current blending method.
DEPTH_TEST0x0B71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
DITHER0x0BD0Passed to enable/disable to turn on/off dithering. Can also be used with getParameter to find the current dithering method.
POLYGON_OFFSET_FILL0x8037Passed 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_COVERAGE0x809EPassed to enable/disable to turn on/off the alpha to coverage. Used in multi-sampling alpha channels.
SAMPLE_COVERAGE0x80A0Passed to enable/disable to turn on/off the sample coverage. Used in multi-sampling.
SCISSOR_TEST0x0C11Passed to enable/disable to turn on/off the scissor test. Can also be used with getParameter to query the scissor test.
STENCIL_TEST0x0B90Passed 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_ERROR0Returned from getError.
INVALID_ENUM0x0500Returned from getError.
INVALID_VALUE0x0501Returned from getError.
INVALID_OPERATION0x0502Returned from getError.
OUT_OF_MEMORY0x0505Returned from getError.
CONTEXT_LOST_WEBGL0x9242Returned from getError.

Front face directions

Constants passed to WebGLRenderingContext.frontFace().

常量名称值说明
CW0x0900Passed to frontFace to specify the front face of a polygon is drawn in the clockwise direction
CCW0x0901Passed 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_CARE0x1100There is no preference for this behavior.
FASTEST0x1101The most efficient behavior should be used.
NICEST0x1102The most correct or the highest quality option should be used.
GENERATE_MIPMAP_HINT0x8192Hint for the quality of filtering when generating mipmap images with WebGLRenderingContext.generateMipmap().

Data types

常量名称值说明
BYTE0x1400
UNSIGNED_BYTE0x1401
SHORT0x1402
UNSIGNED_SHORT0x1403
INT0x1404
UNSIGNED_INT0x1405
FLOAT0x1406

Pixel formats

常量名称值说明
DEPTH_COMPONENT0x1902
ALPHA0x1906
RGB0x1907
RGBA0x1908
LUMINANCE0x1909
LUMINANCE_ALPHA0x190A

Pixel types

常量名称值说明
UNSIGNED_BYTE0x1401
UNSIGNED_SHORT_4_4_4_40x8033
UNSIGNED_SHORT_5_5_5_10x8034
UNSIGNED_SHORT_5_6_50x8363

Shaders

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

常量名称值说明
FRAGMENT_SHADER0x8B30Passed to createShader to define a fragment shader.
VERTEX_SHADER0x8B31Passed to createShader to define a vertex shader
COMPILE_STATUS0x8B81Passed 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_STATUS0x8B80Passed to getShaderParamter to determine if a shader was deleted via deleteShader. Returns true if it was, false otherwise.
LINK_STATUS0x8B82Passed 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_STATUS0x8B83Passed to getProgramParameter after calling validateProgram to determine if it is valid. Returns false if errors were found.
ATTACHED_SHADERS0x8B85Passed to getProgramParameter after calling attachShader to determine if the shader was attached correctly. Returns false if errors occurred.
ACTIVE_ATTRIBUTES0x8B89Passed to getProgramParameter to get the number of attributes active in a program.
ACTIVE_UNIFORMS0x8B86Passed to getProgramParamter to get the number of uniforms active in a program.
MAX_VERTEX_ATTRIBS0x8869
MAX_VERTEX_UNIFORM_VECTORS0x8DFB
MAX_VARYING_VECTORS0x8DFC
MAX_COMBINED_TEXTURE_IMAGE_UNITS0x8B4D
MAX_VERTEX_TEXTURE_IMAGE_UNITS0x8B4C
MAX_TEXTURE_IMAGE_UNITS0x8872Implementation dependent number of maximum texture units. At least 8.
MAX_FRAGMENT_UNIFORM_VECTORS0x8DFD
SHADER_TYPE0x8B4F
SHADING_LANGUAGE_VERSION0x8B8C
CURRENT_PROGRAM0x8B8D

Depth or stencil tests

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

Constant nameValueDescription
NEVER0x0200Passed to depthFunction or stencilFunction to specify depth or stencil tests will never pass. i.e. Nothing will be drawn.
ALWAYS0x0207Passed 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.
LESS0x0201Passed to depthFunction or stencilFunction to specify depth or stencil tests will pass if the new depth value is less than the stored value.
EQUAL0x0202Passed to depthFunction or stencilFunction to specify depth or stencil tests will pass if the new depth value is equals to the stored value.
LEQUAL0x0203如果新深度值小于或等于存储值，则通过 depthFunction 或 stencilFunction 指定深度或模板测试。
GREATER0x0204Passed to depthFunction or stencilFunction to specify depth or stencil tests will pass if the new depth value is greater than the stored value.
GEQUAL0x0206Passed 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.
NOTEQUAL0x0205Passed 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 nameValueDescription
KEEP0x1E00
REPLACE0x1E01
INCR0x1E02
DECR0x1E03
INVERT0x150A
INCR_WRAP0x8507
DECR_WRAP0x8508

Textures

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

Constant nameValueDescription
NEAREST0x2600
LINEAR0x2601
NEAREST_MIPMAP_NEAREST0x2700
LINEAR_MIPMAP_NEAREST0x2701
NEAREST_MIPMAP_LINEAR0x2702
LINEAR_MIPMAP_LINEAR0x2703
TEXTURE_MAG_FILTER0x2800
TEXTURE_MIN_FILTER0x2801
TEXTURE_WRAP_S0x2802
TEXTURE_WRAP_T0x2803
TEXTURE_2D0x0DE1
TEXTURE0x1702
TEXTURE_CUBE_MAP0x8513
TEXTURE_BINDING_CUBE_MAP0x8514
TEXTURE_CUBE_MAP_POSITIVE_X0x8515
TEXTURE_CUBE_MAP_NEGATIVE_X0x8516
TEXTURE_CUBE_MAP_POSITIVE_Y0x8517
TEXTURE_CUBE_MAP_NEGATIVE_Y0x8518
TEXTURE_CUBE_MAP_POSITIVE_Z0x8519
TEXTURE_CUBE_MAP_NEGATIVE_Z0x851A
MAX_CUBE_MAP_TEXTURE_SIZE0x851C
TEXTURE0 - 310x84C0 - 0x84DFA texture unit.
ACTIVE_TEXTURE0x84E0The current active texture unit.
REPEAT0x2901
CLAMP_TO_EDGE0x812F
MIRRORED_REPEAT0x8370

Uniform types

Constant nameValueDescription
FLOAT_VEC20x8B50
FLOAT_VEC30x8B51
FLOAT_VEC40x8B52
INT_VEC20x8B53
INT_VEC30x8B54
INT_VEC40x8B55
BOOL0x8B56
BOOL_VEC20x8B57
BOOL_VEC30x8B58
BOOL_VEC40x8B59
FLOAT_MAT20x8B5A
FLOAT_MAT30x8B5B
FLOAT_MAT40x8B5C
SAMPLER_2D0x8B5E
SAMPLER_CUBE0x8B60

Shader precision-specified types

Constant nameValueDescription
LOW_FLOAT0x8DF0
MEDIUM_FLOAT0x8DF1
HIGH_FLOAT0x8DF2
LOW_INT0x8DF3
MEDIUM_INT0x8DF4
HIGH_INT0x8DF5

Framebuffers and renderbuffers

Constant nameValueDescription
FRAMEBUFFER0x8D40
RENDERBUFFER0x8D41
RGBA40x8056
RGB5_A10x8057
RGB5650x8D62
DEPTH_COMPONENT160x81A5
STENCIL_INDEX0x1901
STENCIL_INDEX80x8D48
DEPTH_STENCIL0x84F9
RENDERBUFFER_WIDTH0x8D42
RENDERBUFFER_HEIGHT0x8D43
RENDERBUFFER_INTERNAL_FORMAT0x8D44
RENDERBUFFER_RED_SIZE0x8D50
RENDERBUFFER_GREEN_SIZE0x8D51
RENDERBUFFER_BLUE_SIZE0x8D52
RENDERBUFFER_ALPHA_SIZE0x8D53
RENDERBUFFER_DEPTH_SIZE0x8D54
RENDERBUFFER_STENCIL_SIZE0x8D55
FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE0x8CD0
FRAMEBUFFER_ATTACHMENT_OBJECT_NAME0x8CD1
FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL0x8CD2
FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACE0x8CD3
COLOR_ATTACHMENT00x8CE0
DEPTH_ATTACHMENT0x8D00
STENCIL_ATTACHMENT0x8D20
DEPTH_STENCIL_ATTACHMENT0x821A
NONE0
FRAMEBUFFER_COMPLETE0x8CD5
FRAMEBUFFER_INCOMPLETE_ATTACHMENT0x8CD6
FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT0x8CD7
FRAMEBUFFER_INCOMPLETE_DIMENSIONS0x8CD9
FRAMEBUFFER_UNSUPPORTED0x8CDD
FRAMEBUFFER_BINDING0x8CA6
RENDERBUFFER_BINDING0x8CA7
MAX_RENDERBUFFER_SIZE0x84E8
INVALID_FRAMEBUFFER_OPERATION0x0506

Pixel storage modes

Constants passed to WebGLRenderingContext.pixelStorei().

Constant nameValueDescription
UNPACK_FLIP_Y_WEBGL0x9240
UNPACK_PREMULTIPLY_ALPHA_WEBGL0x9241
UNPACK_COLORSPACE_CONVERSION_WEBGL0x9243

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 nameValueDescription
READ_BUFFER0x0C02
UNPACK_ROW_LENGTH0x0CF2
UNPACK_SKIP_ROWS0x0CF3
UNPACK_SKIP_PIXELS0x0CF4
PACK_ROW_LENGTH0x0D02
PACK_SKIP_ROWS0x0D03
PACK_SKIP_PIXELS0x0D04
TEXTURE_BINDING_3D0x806A
UNPACK_SKIP_IMAGES0x806D
UNPACK_IMAGE_HEIGHT0x806E
MAX_3D_TEXTURE_SIZE0x8073
MAX_ELEMENTS_VERTICES0x80E8
MAX_ELEMENTS_INDICES0x80E9
MAX_TEXTURE_LOD_BIAS0x84FD
MAX_FRAGMENT_UNIFORM_COMPONENTS0x8B49
MAX_VERTEX_UNIFORM_COMPONENTS0x8B4A
MAX_ARRAY_TEXTURE_LAYERS0x88FF
MIN_PROGRAM_TEXEL_OFFSET0x8904
MAX_PROGRAM_TEXEL_OFFSET0x8905
MAX_VARYING_COMPONENTS0x8B4B
FRAGMENT_SHADER_DERIVATIVE_HINT0x8B8B
RASTERIZER_DISCARD0x8C89
VERTEX_ARRAY_BINDING0x85B5
MAX_VERTEX_OUTPUT_COMPONENTS0x9122
MAX_FRAGMENT_INPUT_COMPONENTS0x9125
MAX_SERVER_WAIT_TIMEOUT0x9111
MAX_ELEMENT_INDEX0x8D6B

Textures

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

Constant nameValueDescription
RED0x1903
RGB80x8051
RGBA80x8058
RGB10_A20x8059
TEXTURES_3D0x806F
TEXTURE_WRAP_R0x8072
TEXTURE_MIN_LOD0x813A
TEXTURE_MAX_LOD0x813B
TEXTURE_BASE_LEVEL0x813C
TEXTURE_MAX_LEVEL0x813D
TEXTURE_COMPARE_MODE0x884C
TEXTURE_COMPARE_FUNC0x884D
SRGB0x8C40
SRGB80x8C41
SRGB8_ALPHA80x8C43
COMPARE_REF_TO_TEXTURE0x884E
RGBA32F0x8814
RGB32F0x8815
RGBA16F0x881A
RGB16F0x881B
TEXTURE_2D_ARRAY0x8C1A
TEXTURE_BINDING_2D_ARRAY0x8C1D
R11F_G11F_B10F0x8C3A
RGB9_E50x8C3D
RGBA32UI0x8D70
RGB32UI0x8D71
RGBA16UI0x8D76
RGB16UI0x8D77
RGBA8UI0x8D7C
RGB8UI0x8D7D
RGBA32I0x8D82
RGB32I0x8D83
RGBA16I0x8D88
RGB16I0x8D89
RGBA8I0x8D8E
RGB8I0x8D8F
RED_INTEGER0x8D94
RGB_INTEGER0x8D98
RGBA_INTEGER0x8D99
R80x8229
RG80x822B
R16F0x822D
R32F0x822E
RG16F0x822F
RG32F0x8230
R8I0x8231
R8UI0x8232
R16I0x8233
R16UI0x8234
R32I0x8235
R32UI0x8236
RG8I0x8237
RG8UI0x8238
RG16I0x8239
RG16UI0x823A
RG32I0x823B
RG32UI0x823C
R8_SNORM0x8F94
RG8_SNORM0x8F95
RGB8_SNORM0x8F96
RGBA8_SNORM0x8F97
RGB10_A2UI0x906F
COMPRESSED_R11_EAC0x9270
COMPRESSED_SIGNED_R11_EAC0x9271
COMPRESSED_RG11_EAC0x9272
COMPRESSED_SIGNED_RG11_EAC0x9273
COMPRESSED_RGB8_ETC20x9274
COMPRESSED_SRGB8_ETC20x9275
COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC20x9276
COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC0x9277
COMPRESSED_RGBA8_ETC2_EAC0x9278
COMPRESSED_SRGB8_ALPHA8_ETC2_EAC0x9279
TEXTURE_IMMUTABLE_FORMAT0x912F
TEXTURE_IMMUTABLE_LEVELS0x82DF

Pixel types

Constant nameValueDescription
UNSIGNED_INT_2_10_10_10_REV0x8368
UNSIGNED_INT_10F_11F_11F_REV0x8C3B
UNSIGNED_INT_5_9_9_9_REV0x8C3E
FLOAT_32_UNSIGNED_INT_24_8_REV0x8DAD
UNSIGNED_INT_24_80x84FA
HALF_FLOAT0x140B
RG0x8227
RG_INTEGER0x8228
INT_2_10_10_10_REV0x8D9F

Queries

Constant nameValueDescription
CURRENT_QUERY0x8865
QUERY_RESULT0x8866
QUERY_RESULT_AVAILABLE0x8867
ANY_SAMPLES_PASSED0x8C2F
ANY_SAMPLES_PASSED_CONSERVATIVE0x8D6A

Draw buffers

Constant nameValueDescription
MAX_DRAW_BUFFERS0x8824
DRAW_BUFFER00x8825
DRAW_BUFFER10x8826
DRAW_BUFFER20x8827
DRAW_BUFFER30x8828
DRAW_BUFFER40x8829
DRAW_BUFFER50x882A
DRAW_BUFFER60x882B
DRAW_BUFFER70x882C
DRAW_BUFFER80x882D
DRAW_BUFFER90x882E
DRAW_BUFFER100x882F
DRAW_BUFFER110x8830
DRAW_BUFFER120x8831
DRAW_BUFFER130x8832
DRAW_BUFFER140x8833
DRAW_BUFFER150x8834
MAX_COLOR_ATTACHMENTS0x8CDF
COLOR_ATTACHMENT10x8CE1
COLOR_ATTACHMENT20x8CE2
COLOR_ATTACHMENT30x8CE3
COLOR_ATTACHMENT40x8CE4
COLOR_ATTACHMENT50x8CE5
COLOR_ATTACHMENT60x8CE6
COLOR_ATTACHMENT70x8CE7
COLOR_ATTACHMENT80x8CE8
COLOR_ATTACHMENT90x8CE9
COLOR_ATTACHMENT100x8CEA
COLOR_ATTACHMENT110x8CEB
COLOR_ATTACHMENT120x8CEC
COLOR_ATTACHMENT130x8CED
COLOR_ATTACHMENT140x8CEE
COLOR_ATTACHMENT150x8CEF

Samplers

Constant nameValueDescription
SAMPLER_3D0x8B5F
SAMPLER_2D_SHADOW0x8B62
SAMPLER_2D_ARRAY0x8DC1
SAMPLER_2D_ARRAY_SHADOW0x8DC4
SAMPLER_CUBE_SHADOW0x8DC5
INT_SAMPLER_2D0x8DCA
INT_SAMPLER_3D0x8DCB
INT_SAMPLER_CUBE0x8DCC
INT_SAMPLER_2D_ARRAY0x8DCF
UNSIGNED_INT_SAMPLER_2D0x8DD2
UNSIGNED_INT_SAMPLER_3D0x8DD3
UNSIGNED_INT_SAMPLER_CUBE0x8DD4
UNSIGNED_INT_SAMPLER_2D_ARRAY0x8DD7
MAX_SAMPLES0x8D57
SAMPLER_BINDING0x8919

Buffers

Constant nameValueDescription
PIXEL_PACK_BUFFER0x88EB
PIXEL_UNPACK_BUFFER0x88EC
PIXEL_PACK_BUFFER_BINDING0x88ED
PIXEL_UNPACK_BUFFER_BINDING0x88EF
COPY_READ_BUFFER0x8F36
COPY_WRITE_BUFFER0x8F37
COPY_READ_BUFFER_BINDING0x8F36
COPY_WRITE_BUFFER_BINDING0x8F37

Data types

Constant nameValueDescription
FLOAT_MAT2x30x8B65
FLOAT_MAT2x40x8B66
FLOAT_MAT3x20x8B67
FLOAT_MAT3x40x8B68
FLOAT_MAT4x20x8B69
FLOAT_MAT4x30x8B6A
UNSIGNED_INT_VEC20x8DC6
UNSIGNED_INT_VEC30x8DC7
UNSIGNED_INT_VEC40x8DC8
UNSIGNED_NORMALIZED0x8C17
SIGNED_NORMALIZED0x8F9C

Vertex attributes

Constant nameValueDescription
VERTEX_ATTRIB_ARRAY_INTEGER0x88FD
VERTEX_ATTRIB_ARRAY_DIVISOR0x88FE

Transform feedback

Constant nameValueDescription
TRANSFORM_FEEDBACK_BUFFER_MODE0x8C7F
MAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTS0x8C80
TRANSFORM_FEEDBACK_VARYINGS0x8C83
TRANSFORM_FEEDBACK_BUFFER_START0x8C84
TRANSFORM_FEEDBACK_BUFFER_SIZE0x8C85
TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN0x8C88
MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS0x8C8A
MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS0x8C8B
INTERLEAVED_ATTRIBS0x8C8C
SEPARATE_ATTRIBS0x8C8D
TRANSFORM_FEEDBACK_BUFFER0x8C8E
TRANSFORM_FEEDBACK_BUFFER_BINDING0x8C8F
TRANSFORM_FEEDBACK0x8E22
TRANSFORM_FEEDBACK_PAUSED0x8E23
TRANSFORM_FEEDBACK_ACTIVE0x8E24
TRANSFORM_FEEDBACK_BINDING0x8E25

Framebuffers and renderbuffers

Constant nameValueDescription
FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING0x8210
FRAMEBUFFER_ATTACHMENT_COMPONENT_TYPE0x8211
FRAMEBUFFER_ATTACHMENT_RED_SIZE0x8212
FRAMEBUFFER_ATTACHMENT_GREEN_SIZE0x8213
FRAMEBUFFER_ATTACHMENT_BLUE_SIZE0x8214
FRAMEBUFFER_ATTACHMENT_ALPHA_SIZE0x8215
FRAMEBUFFER_ATTACHMENT_DEPTH_SIZE0x8216
FRAMEBUFFER_ATTACHMENT_STENCIL_SIZE0x8217
FRAMEBUFFER_DEFAULT0x8218
DEPTH_STENCIL_ATTACHMENT0x821A
DEPTH_STENCIL0x84F9
DEPTH24_STENCIL80x88F0
DRAW_FRAMEBUFFER_BINDING0x8CA6
READ_FRAMEBUFFER0x8CA8
DRAW_FRAMEBUFFER0x8CA9
READ_FRAMEBUFFER_BINDING0x8CAA
RENDERBUFFER_SAMPLES0x8CAB
FRAMEBUFFER_ATTACHMENT_TEXTURE_LAYER0x8CD4
FRAMEBUFFER_INCOMPLETE_MULTISAMPLE0x8D56

Uniforms

Constant nameValueDescription
UNIFORM_BUFFER0x8A11
UNIFORM_BUFFER_BINDING0x8A28
UNIFORM_BUFFER_START0x8A29
UNIFORM_BUFFER_SIZE0x8A2A
MAX_VERTEX_UNIFORM_BLOCKS0x8A2B
MAX_FRAGMENT_UNIFORM_BLOCKS0x8A2D
MAX_COMBINED_UNIFORM_BLOCKS0x8A2E
MAX_UNIFORM_BUFFER_BINDINGS0x8A2F
MAX_UNIFORM_BLOCK_SIZE0x8A30
MAX_COMBINED_VERTEX_UNIFORM_COMPONENTS0x8A31
MAX_COMBINED_FRAGMENT_UNIFORM_COMPONENTS0x8A33
UNIFORM_BUFFER_OFFSET_ALIGNMENT0x8A34
ACTIVE_UNIFORM_BLOCKS0x8A36
UNIFORM_TYPE0x8A37
UNIFORM_SIZE0x8A38
UNIFORM_BLOCK_INDEX0x8A3A
UNIFORM_OFFSET0x8A3B
UNIFORM_ARRAY_STRIDE0x8A3C
UNIFORM_MATRIX_STRIDE0x8A3D
UNIFORM_IS_ROW_MAJOR0x8A3E
UNIFORM_BLOCK_BINDING0x8A3F
UNIFORM_BLOCK_DATA_SIZE0x8A40
UNIFORM_BLOCK_ACTIVE_UNIFORMS0x8A42
UNIFORM_BLOCK_ACTIVE_UNIFORM_INDICES0x8A43
UNIFORM_BLOCK_REFERENCED_BY_VERTEX_SHADER0x8A44
UNIFORM_BLOCK_REFERENCED_BY_FRAGMENT_SHADER0x8A46

Sync objects

Constant nameValueDescription
OBJECT_TYPE0x9112
SYNC_CONDITION0x9113
SYNC_STATUS0x9114
SYNC_FLAGS0x9115
SYNC_FENCE0x9116
SYNC_GPU_COMMANDS_COMPLETE0x9117
UNSIGNALED0x9118
SIGNALED0x9119
ALREADY_SIGNALED0x911A
TIMEOUT_EXPIRED0x911B
CONDITION_SATISFIED0x911C
WAIT_FAILED0x911D
SYNC_FLUSH_COMMANDS_BIT0x00000001

Miscellaneous constants

Constant nameValueDescription
COLOR0x1800
DEPTH0x1801
STENCIL0x1802
MIN0x8007
MAX0x8008
DEPTH_COMPONENT240x81A6
STREAM_READ0x88E1
STREAM_COPY0x88E2
STATIC_READ0x88E5
STATIC_COPY0x88E6
DYNAMIC_READ0x88E9
DYNAMIC_COPY0x88EA
DEPTH_COMPONENT32F0x8CAC
DEPTH32F_STENCIL80x8CAD
INVALID_INDEX0xFFFFFFFF
TIMEOUT_IGNORED-1
MAX_CLIENT_WAIT_TIMEOUT_WEBGL0x9247

Constants defined in WebGL extensions

ANGLE_instanced_arrays

Constant nameValueDescription
VERTEX_ATTRIB_ARRAY_DIVISOR_ANGLE0x88FEDescribes the frequency divisor used for instanced rendering.

WEBGL_debug_renderer_info

Constant nameValueDescription
UNMASKED_VENDOR_WEBGL0x9245Passed to getParameter to get the vendor string of the graphics driver.
UNMASKED_RENDERER_WEBGL0x9246Passed to getParameter to get the renderer string of the graphics driver.

EXT_texture_filter_anisotropic

Constant nameValueDescription
MAX_TEXTURE_MAX_ANISOTROPY_EXT0x84FFReturns the maximum available anisotropy.
TEXTURE_MAX_ANISOTROPY_EXT0x84FEPassed to texParameter to set the desired maximum anisotropy for a texture.

WEBGL_compressed_texture_s3tc

Constant nameValueDescription
COMPRESSED_RGB_S3TC_DXT1_EXT0x83F0A DXT1-compressed image in an RGB image format.
COMPRESSED_RGBA_S3TC_DXT1_EXT0x83F1A DXT1-compressed image in an RGB image format with a simple on/off alpha value.
COMPRESSED_RGBA_S3TC_DXT3_EXT0x83F2A DXT3-compressed image in an RGBA image format. Compared to a 32-bit RGBA texture, it offers 4:1 compression.
COMPRESSED_RGBA_S3TC_DXT5_EXT0x83F3A 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 nameValueDescription
COMPRESSED_R11_EAC0x9270One-channel (red) unsigned format compression.
COMPRESSED_SIGNED_R11_EAC0x9271One-channel (red) signed format compression.
COMPRESSED_RG11_EAC0x9272Two-channel (red and green) unsigned format compression.
COMPRESSED_SIGNED_RG11_EAC0x9273Two-channel (red and green) signed format compression.
COMPRESSED_RGB8_ETC20x9274Compresses RBG8 data with no alpha channel.
COMPRESSED_RGBA8_ETC2_EAC0x9275Compresses RGBA8 data. The RGB part is encoded the same as RGB_ETC2, but the alpha part is encoded separately.
COMPRESSED_SRGB8_ETC20x9276Compresses sRBG8 data with no alpha channel.
COMPRESSED_SRGB8_ALPHA8_ETC2_EAC0x9277Compresses sRGBA8 data. The sRGB part is encoded the same as SRGB_ETC2, but the alpha part is encoded separately.
COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC20x9278Similar 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_ETC20x9279Similar 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 nameValueDescription
COMPRESSED_RGB_PVRTC_4BPPV1_IMG0x8C00RGB compression in 4-bit mode. One block for each 4×4 pixels.
COMPRESSED_RGBA_PVRTC_4BPPV1_IMG0x8C02RGBA compression in 4-bit mode. One block for each 4×4 pixels.
COMPRESSED_RGB_PVRTC_2BPPV1_IMG0x8C01RGB compression in 2-bit mode. One block for each 8×4 pixels.
COMPRESSED_RGBA_PVRTC_2BPPV1_IMG0x8C03RGBA compression in 2-bit mode. One block for each 8×4 pixe

WEBGL_compressed_texture_etc1

Constant nameValueDescription
COMPRESSED_RGB_ETC1_WEBGL0x8D64Compresses 24-bit RGB data with no alpha channel.

WEBGL_compressed_texture_atc

Constant nameValueDescription
COMPRESSED_RGB_ATC_WEBGL0x8C92Compresses RGB textures with no alpha channel.
COMPRESSED_RGBA_ATC_EXPLICIT_ALPHA_WEBGL0x8C92Compresses RGBA textures using explicit alpha encoding (useful when alpha transitions are sharp).
COMPRESSED_RGBA_ATC_INTERPOLATED_ALPHA_WEBGL0x87EECompresses RGBA textures using interpolated alpha encoding (useful when alpha transitions are gradient).

WEBGL_depth_texture

Constant nameValueDescription
UNSIGNED_INT_24_8_WEBGL0x84FAUnsigned integer type for 24-bit depth texture data.

OES_texture_half_float

Constant nameValueDescription
HALF_FLOAT_OES0x8D61Half floating-point type (16-bit).

WEBGL_color_buffer_float

Constant nameValueDescription
RGBA32F_EXT0x8814RGBA 32-bit floating-point color-renderable format.
RGB32F_EXT0x8815RGB 32-bit floating-point color-renderable format.
FRAMEBUFFER_ATTACHMENT_COMPONENT_TYPE_EXT0x8211
UNSIGNED_NORMALIZED_EXT0x8C17

EXT_blend_minmax

Constant nameValueDescription
MIN_EXT0x8007Produces the minimum color components of the source and destination colors.
MAX_EXT0x8008Produces the maximum color components of the source and destination colors.

EXT_sRGB

Constant nameValueDescription
SRGB_EXT0x8C40Unsized sRGB format that leaves the precision up to the driver.
SRGB_ALPHA_EXT0x8C42Unsized sRGB format with unsized alpha component.
SRGB8_ALPHA8_EXT0x8C43Sized (8-bit) sRGB and alpha formats.
FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING_EXT0x8210Returns the framebuffer color encoding.

OES_standard_derivatives

Constant nameValueDescription
FRAGMENT_SHADER_DERIVATIVE_HINT_OES0x8B8BIndicates the accuracy of the derivative calculation for the GLSL built-in functions: dFdx, dFdy, and fwidth.

WEBGL_draw_buffers

Constant nameValueDescription
COLOR_ATTACHMENT0_WEBGL0x8CE0Framebuffer color attachment point
COLOR_ATTACHMENT1_WEBGL0x8CE1Framebuffer color attachment point
COLOR_ATTACHMENT2_WEBGL0x8CE2Framebuffer color attachment point
COLOR_ATTACHMENT3_WEBGL0x8CE3Framebuffer color attachment point
COLOR_ATTACHMENT4_WEBGL0x8CE4Framebuffer color attachment point
COLOR_ATTACHMENT5_WEBGL0x8CE5Framebuffer color attachment point
COLOR_ATTACHMENT6_WEBGL0x8CE6Framebuffer color attachment point
COLOR_ATTACHMENT7_WEBGL0x8CE7Framebuffer color attachment point
COLOR_ATTACHMENT8_WEBGL0x8CE8Framebuffer color attachment point
COLOR_ATTACHMENT9_WEBGL0x8CE9Framebuffer color attachment point
COLOR_ATTACHMENT10_WEBGL0x8CEAFramebuffer color attachment point
COLOR_ATTACHMENT11_WEBGL0x8CEBFramebuffer color attachment point
COLOR_ATTACHMENT12_WEBGL0x8CECFramebuffer color attachment point
COLOR_ATTACHMENT13_WEBGL0x8CEDFramebuffer color attachment point
COLOR_ATTACHMENT14_WEBGL0x8CEEFramebuffer color attachment point
COLOR_ATTACHMENT15_WEBGL0x8CEFFramebuffer color attachment point
DRAW_BUFFER0_WEBGL0x8825Draw buffer
DRAW_BUFFER1_WEBGL0x8826Draw buffer
DRAW_BUFFER2_WEBGL0x8827Draw buffer
DRAW_BUFFER3_WEBGL0x8828Draw buffer
DRAW_BUFFER4_WEBGL0x8829Draw buffer
DRAW_BUFFER5_WEBGL0x882ADraw buffer
DRAW_BUFFER6_WEBGL0x882BDraw buffer
DRAW_BUFFER7_WEBGL0x882CDraw buffer
DRAW_BUFFER8_WEBGL0x882DDraw buffer
DRAW_BUFFER9_WEBGL0x882EDraw buffer
DRAW_BUFFER10_WEBGL0x882FDraw buffer
DRAW_BUFFER11_WEBGL0x8830Draw buffer
DRAW_BUFFER12_WEBGL0x8831Draw buffer
DRAW_BUFFER13_WEBGL0x8832Draw buffer
DRAW_BUFFER14_WEBGL0x8833Draw buffer
DRAW_BUFFER15_WEBGL0x8834Draw buffer
MAX_COLOR_ATTACHMENTS_WEBGL0x8CDFMaximum number of framebuffer color attachment points
MAX_DRAW_BUFFERS_WEBGL0x8824Maximum number of draw buffers

OES_vertex_array_object

Constant nameValueDescription
VERTEX_ARRAY_BINDING_OES0x85B5The bound vertex array object (VAO).

EXT_disjoint_timer_query

Constant nameValueDescription
QUERY_COUNTER_BITS_EXT0x8864The number of bits used to hold the query result for the given target.
CURRENT_QUERY_EXT0x8865The currently active query.
QUERY_RESULT_EXT0x8866The query result.
QUERY_RESULT_AVAILABLE_EXT0x8867A Boolean indicating whether or not a query result is available.
TIME_ELAPSED_EXT0x88BFElapsed time (in nanoseconds).
TIMESTAMP_EXT0x8E28The current time.
GPU_DISJOINT_EXT0x8FBBA Boolean indicating whether or not the GPU performed any disjoint operation.

Specifications

SpecificationStatusComment
WebGL 1.0
WebGLRenderingContext		RecommendationInitial definition
WebGL 2.0
WebGL2RenderingContext		Editor's DraftDefines 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!
FeatureChromeFirefox (Gecko)Internet ExplorerOperaSafari
Basic support94.0 (2.0)11125.1
FeatureAndroidChrome for AndroidFirefox Mobile (Gecko)IE MobileOpera MobileSafari Mobile
Basic support?25(Yes)?128.1

See also

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