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

Specification	Status	Comment
WebGL 1.0 The definition of 'enable' in that specification.	Recommendation	Initial definition for WebGL.
OpenGL ES 2.0 The definition of 'glEnable' in that specification.	Standard	Man page of the OpenGL ES 2.0 API.
OpenGL ES 3.0 The definition of 'glEnable' in that specification.	Standard	Man page of the OpenGL ES 3.0 API.

Browser compatibility

See also

• WebGLRenderingContext.disable()
• WebGLRenderingContext.isEnabled()