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Showing content from http://developer.mozilla.org/en-US/docs/Web/API/WebGLRenderingContext/isEnabled below:

WebGLRenderingContext: isEnabled() method - Web APIs

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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.

cap

A GLenum specifying which WebGL capability to test. Possible values:

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);

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