Web/API/WebGLRenderingContext/isEnabled

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.

Syntax

GLboolean gl.isEnabled(cap);

Parameters

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.

Return value

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

Examples

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);

Specifications

Specification	Status	Comment
WebGL 1.0The definition of 'isEnabled' in that specification.	Recommendation	Initial definition for WebGL.
OpenGL ES 2.0The definition of 'glIsEnabled' in that specification.	Standard	Man page of the (similar) OpenGL ES 2.0 API.
WebGL 2.0The definition of 'isEnabled' in that specification.	Editor's Draft	Updated definition for WebGL 2.
OpenGL ES 3.0The definition of 'glIsEnabled' in that specification.	Standard	Man page of the (similar) OpenGL ES 3.0 API.

Browser compatibility

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