WebGLRenderingContext.enable()
The WebGLRenderingContext.enable()
method of the WebGL API enables specific WebGL capabilities for this context.
Syntax
JavaScript
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void <var>gl</var>.enable(<var>cap</var>);
Parameters
cap
- A
GLenum
specifying which WebGL capability to enable. Possible values: -
Constant Description gl.BLEND
Activates blending of the computed fragment color values. See WebGLRenderingContext.blendFunc()
.gl.CULL_FACE
Activates culling of polygons. See WebGLRenderingContext.cullFace()
.gl.DEPTH_TEST
Activates depth comparisons and updates to the depth buffer. See WebGLRenderingContext.depthFunc()
.gl.DITHER
Activates dithering of color components before they get written to the color buffer. gl.POLYGON_OFFSET_FILL
Activates adding an offset to depth values of polygon's fragments. See WebGLRenderingContext.polygonOffset()
.gl.SAMPLE_ALPHA_TO_COVERAGE
Activates the computation of a temporary coverage value determined by the alpha value. gl.SAMPLE_COVERAGE
Activates ANDing the fragment's coverage with the temporary coverage value. See WebGLRenderingContext.sampleCoverage()
.gl.SCISSOR_TEST
Activates the scissor test that discards fragments that are outside of the scissor rectangle. See WebGLRenderingContext.scissor()
.gl.STENCIL_TEST
Activates stencil testing and updates to the stencil buffer. See WebGLRenderingContext.stencilFunc()
.Constant Description gl.RASTERIZER_DISCARD
Primitives are discarded immediately before the rasterization stage, but after the optional transform feedback stage. gl.clear()
commands are ignored.
Return value
None.
Examples
JavaScript
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gl.enable(gl.DITHER);
To check if a capability is enabled, use the WebGLRenderingContext.isEnabled()
method:
JavaScript
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gl.isEnabled(gl.DITHER); // true
Specifications
Specification | Status | Comment |
---|---|---|
WebGL 1.0 The definition of 'enable' in that specification. |
Recommendation | Initial definition for WebGL. |
OpenGL ES 2.0 The definition of 'glEnable' in that specification. |
Standard | Man page of the OpenGL ES 2.0 API. |
OpenGL ES 3.0 The definition of 'glEnable' in that specification. |
Standard | Man page of the OpenGL ES 3.0 API. |
Browser compatibility
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
License
© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-us/docs/web/api/webglrenderingcontext/enable