WebGLRenderingContext: enable() method

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

Note: This feature is available in Web Workers.

Phương thức WebGLRenderingContext.enable() của WebGL API cho phép các khả năng WebGL cụ thể cho bối cảnh này.

Cú pháp

enable(cap)

Thông số

cap

Một GLenum chỉ định khả năng WebGL nào sẽ được kích hoạt. Khả thi giá trị:

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()`.

Khi sử dụng WebGL 2 context, các giá trị sau đây có sẵn bổ sung:

| 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. |