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  4. WebGLRenderingContext.blendEquationSeparate()

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WebGLRenderingContext.blendEquationSeparate() 方法在 WebGL API is used to set the RGB blend equation and alpha blend equation separately.

The blend equation determines how a new pixel is combined with a pixel already in the WebGLFramebuffer .

句法 

void gl.blendEquationSeparate(modeRGB, modeAlpha);

参数

modeRGB
A GLenum specifying how the red, green and blue components of source and destination colors are combined. Must be either:
  • gl.FUNC_ADD : source + destination (default value),
  • gl.FUNC_SUBTRACT : source - destination,
  • gl.FUNC_REVERSE_SUBTRACT : destination - source,
  • 当使用 EXT_blend_minmax extension:
    • ext.MIN_EXT : Minimum of source and destination,
    • ext.MAX_EXT : Maximum of source and destination.
  • 当使用 WebGL 2 context , the following values are available additionally:
    • gl.MIN : Minimum of source and destination,
    • gl.MAX : Maximum of source and destination.
modeAlpha
A GLenum specifying how the alpha component (transparency) of source and destination colors are combined. Must be either:
  • gl.FUNC_ADD : source + destination (default value),
  • gl.FUNC_SUBTRACT : source - destination,
  • gl.FUNC_REVERSE_SUBTRACT : destination - source,
  • 当使用 EXT_blend_minmax extension:
    • ext.MIN_EXT : Minimum of source and destination,
    • ext.MAX_EXT : Maximum of source and destination.
  • 当使用 WebGL 2 context , the following values are available additionally:
    • gl.MIN : Minimum of source and destination,
    • gl.MAX : Maximum of source and destination.

返回值

None.

异常

若 mode is not one of the three possible values, a gl.INVALID_ENUM error is thrown.

范例

To set the blend equations, use: 

gl.blendEquationSeparate(gl.FUNC_ADD, gl.FUNC_SUBTRACT);

To get the current blend equations, query the BLEND_EQUATION , BLEND_EQUATION_RGB and BLEND_EQUATION_ALPHA constants which return gl.FUNC_ADD , gl.FUNC_SUBTRACT , gl.FUNC_REVERSE_SUBTRACT , or if the EXT_blend_minmax is enabled: ext.MIN_EXT or ext.MAX_EXT . 

gl.getParameter(gl.BLEND_EQUATION_RGB) === gl.FUNC_ADD;
// true
gl.getParameter(gl.BLEND_EQUATION_ALPHA) === gl.FUNC_ADD;
// true

规范

规范 状态 注释
WebGL 1.0
The definition of 'blendEquationSeparate' in that specification. 		推荐 Initial definition for WebGL.
OpenGL ES 2.0
The definition of 'glBlendEquationSeparate' in that specification. 		标准 Man page of the OpenGL ES 2.0 API.
OpenGL ES 3.0
The definition of 'glBlendEquationSeparate' in that specification. 		标准 Man page of the OpenGL ES 3.0 API.

浏览器兼容性

更新 GitHub 上的兼容性数据
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Chrome Edge Firefox Internet Explorer Opera Safari Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
blendEquationSeparate Chrome 9 Edge 12 Firefox 4 IE 11 Opera 12 Safari 5.1 WebView Android Yes Chrome Android 25 Firefox Android Yes Opera Android 12 Safari iOS 8 Samsung Internet Android 1.5
WebGL2 Chrome 56 Edge 79 Firefox 51 IE No Opera 43 Safari No WebView Android 58 Chrome Android 58 Firefox Android 51 Opera Android 43 Safari iOS No Samsung Internet Android 7.0

图例

完整支持

完整支持

不支持

不支持

另请参阅

元数据

  • 最后修改：
  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