files/en-us/web/api/webglrenderingcontext/isenabled/index.md
{{APIRef("WebGL")}}{{AvailableInWorkers}}
The WebGLRenderingContext.isEnabled() method of the WebGL API tests whether a specific WebGL
capability is enabled or not for this context.
By default, all capabilities except gl.DITHER are
disabled.
isEnabled(cap)
cap
: A {{domxref("WebGL_API/Types", "GLenum")}} specifying which WebGL capability to test. Possible values:
| Constant | Description |
|---|---|
gl.BLEND | Blending of the computed fragment color values. See {{domxref("WebGLRenderingContext.blendFunc()")}}. |
gl.CULL_FACE | Culling of polygons. See {{domxref("WebGLRenderingContext.cullFace()")}}. |
gl.DEPTH_TEST | Depth comparisons and updates to the depth buffer. See {{domxref("WebGLRenderingContext.depthFunc()")}}. |
gl.DITHER | Dithering of color components before they get written to the color buffer. |
gl.POLYGON_OFFSET_FILL | Adding an offset to depth values of polygon's fragments. See {{domxref("WebGLRenderingContext.polygonOffset()")}}. |
gl.SAMPLE_ALPHA_TO_COVERAGE | Computation of a temporary coverage value determined by the alpha value. |
gl.SAMPLE_COVERAGE | ANDing the fragment's coverage with the temporary coverage value. See {{domxref("WebGLRenderingContext.sampleCoverage()")}}. |
gl.SCISSOR_TEST | Scissor test that discards fragments that are outside of the scissor rectangle. See {{domxref("WebGLRenderingContext.scissor()")}}. |
gl.STENCIL_TEST | 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. |
A {{domxref("WebGL_API/Types", "GLboolean")}} indicating if the capability cap is enabled
(true), or not (false).
gl.isEnabled(gl.STENCIL_TEST);
// false
To activate or deactivate a specific capability, use the {{domxref("WebGLRenderingContext.enable()")}} and {{domxref("WebGLRenderingContext.disable()")}} methods:
gl.enable(gl.STENCIL_TEST);
gl.disable(gl.STENCIL_TEST);
{{Specifications}}
{{Compat}}