WebGLRenderingContext: isEnabled() method

Note: This feature is available in Web Workers.

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

isEnabled(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);