WebGLRenderingContext.enable()

The WebGLRenderingContext.enable() method of the WebGL API enables specific WebGL capabilities for this context.

Syntax

void gl.enable(cap);

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().

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

None.

Examples

gl.enable(gl.DITHER);

To check if a capability is enabled, use the WebGLRenderingContext.isEnabled() method:

gl.isEnabled(gl.DITHER);
// true

Specifications

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
enable
9
12
4
11
12
5.1
≤37
25
Yes
12
8
1.5

See also

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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/WebGLRenderingContext/enable