files/en-us/web/api/webglrenderingcontext/enable/index.md
{{APIRef("WebGL")}}{{AvailableInWorkers}}
The WebGLRenderingContext.enable() method of the WebGL API enables specific WebGL capabilities
for this context.
enable(cap)
cap
: A {{domxref("WebGL_API/Types", "GLenum")}} specifying which WebGL capability to enable. Possible values:
| Constant | Description |
|---|---|
gl.BLEND | Activates blending of the computed fragment color values. See {{domxref("WebGLRenderingContext.blendFunc()")}}. |
gl.CULL_FACE | Activates culling of polygons. See {{domxref("WebGLRenderingContext.cullFace()")}}. |
gl.DEPTH_TEST | Activates depth comparisons and updates to the depth buffer. See {{domxref("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 {{domxref("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 {{domxref("WebGLRenderingContext.sampleCoverage()")}}. |
gl.SCISSOR_TEST | Activates the scissor test that discards fragments that are outside of the scissor rectangle. See {{domxref("WebGLRenderingContext.scissor()")}}. |
gl.STENCIL_TEST | Activates stencil testing and updates to the stencil buffer. See {{domxref("WebGLRenderingContext.stencilFunc()")}}. |
When using a {{domxref("WebGL2RenderingContext", "WebGL 2 context", "", 1)}}, 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 ({{jsxref("undefined")}}).
gl.enable(gl.DITHER);
To check if a capability is enabled, use the {{domxref("WebGLRenderingContext.isEnabled()")}} method:
gl.isEnabled(gl.DITHER);
// true
{{Specifications}}
{{Compat}}