在此页

• 句法
• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

WebGLRenderingContext.isEnabled() 方法在 WebGL API tests whether a specific WebGL capability is enabled or not for this context.

By default, all capabilities except gl.DITHER are 被禁用 .

句法

GLboolean gl.isEnabled(cap);
					

参数

cap

A GLenum specifying which WebGL capability to test. Possible values:

常量	描述
gl.BLEND	Blending of the computed fragment color values. See WebGLRenderingContext.blendFunc() .
gl.CULL_FACE	Culling of polygons. See WebGLRenderingContext.cullFace() .
gl.DEPTH_TEST	Depth comparisons and updates to the depth buffer. See WebGLRenderingContext.depthFunc() .
gl.DITHER	Dithering of color components before they get written to the color buffer.
gl.POLYGON_OFFSET_FILL	Adding an offset to depth values of polygon's fragments. See WebGLRenderingContext.polygonOffset() .
gl.SAMPLE_ALPHA_TO_COVERAGE	Computation of a temporary coverage value determined by the alpha value.
gl.SAMPLE_COVERAGE	ANDing the fragment's coverage with the temporary coverage value. See WebGLRenderingContext.sampleCoverage() .
gl.SCISSOR_TEST	Scissor test that discards fragments that are outside of the scissor rectangle. See WebGLRenderingContext.scissor() .
gl.STENCIL_TEST	Stencil testing and updates to the stencil buffer. See WebGLRenderingContext.stencilFunc() .

当使用 WebGL 2 context , the following values are available additionally:

常量	描述
gl.RASTERIZER_DISCARD	Primitives are discarded immediately before the rasterization stage, but after the optional transform feedback stage. gl.clear() commands are ignored.

返回值

A GLboolean indicating if the capability cap is enabled ( true ), or not ( false ).

范例

gl.isEnabled(gl.STENCIL_TEST);
// false
					

To activate or deactivate a specific capability, use the WebGLRenderingContext.enable() and WebGLRenderingContext.disable() 方法：

gl.enable(gl.STENCIL_TEST);
gl.disable(gl.STENCIL_TEST);
					

规范

规范	状态	注释
WebGL 1.0 The definition of 'isEnabled' in that specification.	推荐	Initial definition for WebGL.
OpenGL ES 2.0 The definition of 'glIsEnabled' in that specification.	标准	Man page of the (similar) OpenGL ES 2.0 API.
WebGL 2.0 The definition of 'isEnabled' in that specification.	编者草案	Updated definition for WebGL 2.
OpenGL ES 3.0 The definition of 'glIsEnabled' in that specification.	标准	Man page of the (similar) OpenGL ES 3.0 API.

浏览器兼容性

The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

No compatibility data found. Please contribute data for "api/WebGLRenderingContext" (depth: WebGLRenderingContext.isEnabled) to the MDN 兼容性数据存储库 .

另请参阅

• WebGLRenderingContext.enable()
• WebGLRenderingContext.disable()

元数据

• 最后修改： 2019 年 3 月 23 日

相关话题

1. WebGL API
2. WebGLRenderingContext
3. 特性

   1. canvas
   2. drawingBufferHeight
   3. drawingBufferWidth
4. 方法

   1. activeTexture()
   2. attachShader()
   3. bindAttribLocation()
   4. bindBuffer()
   5. bindFramebuffer()
   6. bindRenderbuffer()
   7. bindTexture()
   8. blendColor()
   9. blendEquation()
   10. blendEquationSeparate()
   11. blendFunc()
   12. blendFuncSeparate()
   13. bufferData()
   14. bufferSubData()
   15. checkFramebufferStatus()
   16. clear()
   17. clearColor()
   18. clearDepth()
   19. clearStencil()
   20. colorMask()
   21. commit()
   22. compileShader()
   23. compressedTexImage[23]D()
   24. compressedTexSubImage2D()
   25. copyTexImage2D()
   26. copyTexSubImage2D()
   27. createBuffer()
   28. createFramebuffer()
   29. createProgram()
   30. createRenderbuffer()
   31. createShader()
   32. createTexture()
   33. cullFace()
   34. deleteBuffer()
   35. deleteFramebuffer()
   36. deleteProgram()
   37. deleteRenderbuffer()
   38. deleteShader()
   39. deleteTexture()
   40. depthFunc()
   41. depthMask()
   42. depthRange()
   43. detachShader()
   44. disable()
   45. disableVertexAttribArray()
   46. drawArrays()
   47. drawElements()
   48. enable()
   49. enableVertexAttribArray()
   50. finish()
   51. flush()
   52. framebufferRenderbuffer()
   53. framebufferTexture2D()
   54. frontFace()
   55. generateMipmap()
   56. getActiveAttrib()
   57. getActiveUniform()
   58. getAttachedShaders()
   59. getAttribLocation()
   60. getBufferParameter()
   61. getContextAttributes()
   62. getError()
   63. getExtension()
   64. getFramebufferAttachmentParameter()
   65. getParameter()
   66. getProgramInfoLog()
   67. getProgramParameter()
   68. getRenderbufferParameter()
   69. getShaderInfoLog()
   70. getShaderParameter()
   71. getShaderPrecisionFormat()
   72. getShaderSource()
   73. getSupportedExtensions()
   74. getTexParameter()
   75. getUniform()
   76. getUniformLocation()
   77. getVertexAttrib()
   78. getVertexAttribOffset()
   79. hint()
   80. isBuffer()
   81. isContextLost()
   82. isEnabled()
   83. isFramebuffer()
   84. isProgram()
   85. isRenderbuffer()
   86. isShader()
   87. isTexture()
   88. lineWidth()
   89. linkProgram()
   90. pixelStorei()
   91. polygonOffset()
   92. readPixels()
   93. renderbufferStorage()
   94. sampleCoverage()
   95. scissor()
   96. shaderSource()
   97. stencilFunc()
   98. stencilFuncSeparate()
   99. stencilMask()
   100. stencilMaskSeparate()
   101. stencilOp()
   102. stencilOpSeparate()
   103. texImage2D()
   104. texParameter[fi]()
   105. texSubImage2D()
   106. uniform[1234][fi][v]()
   107. uniformMatrix[234]fv()
   108. useProgram()
   109. validateProgram()
   110. vertexAttrib[1234]f[v]()
   111. vertexAttribPointer()
   112. viewport()
5. WebGL 相关页面

   1. ANGLE_instanced_arrays
   2. EXT_blend_minmax
   3. EXT_color_buffer_half_float
   4. EXT_disjoint_timer_query
   5. EXT_frag_depth
   6. EXT_sRGB
   7. EXT_shader_texture_lod
   8. EXT_texture_filter_anisotropic
   9. OES_element_index_uint
   10. OES_standard_derivatives
   11. OES_texture_float
   12. OES_texture_float_linear
   13. OES_texture_half_float
   14. OES_texture_half_float_linear
   15. OES_vertex_array_object
   16. WEBGL_color_buffer_float
   17. WEBGL_compressed_texture_atc
   18. WEBGL_compressed_texture_etc1
   19. WEBGL_compressed_texture_pvrtc
   20. WEBGL_compressed_texture_s3tc
   21. WEBGL_compressed_texture_s3tc_srgb
   22. WEBGL_debug_renderer_info
   23. WEBGL_debug_shaders
   24. WEBGL_depth_texture
   25. WEBGL_draw_buffers
   26. WEBGL_lose_context
   27. WebGL2RenderingContext
   28. WebGLActiveInfo
   29. WebGLBuffer
   30. WebGLContextEvent
   31. WebGLFramebuffer
   32. WebGLObject
   33. WebGLProgram
   34. WebGLQuery
   35. WebGLRenderbuffer
   36. WebGLSampler
   37. WebGLShader
   38. WebGLShaderPrecisionFormat
   39. WebGLSync
   40. WebGLTexture
   41. WebGLTransformFeedback
   42. WebGLUniformLocation
   43. WebGLVertexArrayObject