The WebGLRenderingContext.isEnabled()
method of the WebGL API tests whether a specific WebGL capability is enabled or not for this context.
By default, all capabilities except gl.DITHER
are disabled.
The WebGLRenderingContext.isEnabled()
method of the WebGL API tests whether a specific WebGL capability is enabled or not for this context.
By default, all capabilities except gl.DITHER
are disabled.
isEnabled(cap)
cap
A GLenum
specifying which WebGL capability to test. Possible values:
Constant | Description |
---|---|
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() . |
When using a WebGL 2 context, the following values are available additionally:
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. |
A GLboolean
indicating if the capability cap is enabled (true
), or not (false
).
gl.isEnabled(gl.STENCIL_TEST); // false
To activate or deactivate a specific capability, use the WebGLRenderingContext.enable()
and WebGLRenderingContext.disable()
methods:
gl.enable(gl.STENCIL_TEST); gl.disable(gl.STENCIL_TEST);
Specification |
---|
WebGL Specification # 5.14.3 |
WebGL 2.0 Specification # 3.7.2 |
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
isEnabled |
9
|
12
|
4
|
11
|
12
|
5.1
|
4.4.3
|
25
|
4
|
12
|
8
|
1.5
|
WebGL2 |
56
|
79
|
51
|
No
|
43
|
No
|
58
|
58
|
51
|
43
|
No
|
7.0
|
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https://developer.mozilla.org/en-US/docs/Web/API/WebGLRenderingContext/isEnabled