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

Feature Chrome Edge Firefox Internet Explorer Opera Safari Servo
Basic Support9124.011125.1No support
Feature Android Chrome for Android Edge Mobile Firefox for Android IE Mobile Opera Mobile Safari Mobile
Basic Support(Yes)25(Yes)4.0128.1

See also

Document Tags and Contributors

 Contributors to this page: teoli, fscholz
 Last updated by: teoli,