WebGLRenderingContext.enable() - Web APIs 编辑

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

Syntax

void gl.enable(cap);

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.

None.

gl.enable(gl.DITHER);

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

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

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.

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