The WebGLRenderingContext.sampleCoverage() method of the WebGL API specifies multi-sample coverage parameters for anti-aliasing effects.
void gl.sampleCoverage(value, invert);
GLclampf which sets a single floating-point coverage value clamped to the range [0,1]. The default value is 1.0.GLboolean which sets whether or not the coverage masks should be inverted. The default value is false.None.
Multi-sampling is disabled by default. To enable or disable multi-sampling, use the enable() and disable() methods with the argument gl.SAMPLE_COVERAGE and gl.SAMPLE_ALPHA_TO_COVERAGE.
gl.enable(gl.SAMPLE_COVERAGE); gl.sampleCoverage(0.5, false);
To check the sample coverage values, query the SAMPLE_COVERAGE_VALUE and SAMPLE_COVERAGE_INVERT constants.
gl.getParameter(gl.SAMPLE_COVERAGE_VALUE); // 0.5 gl.getParameter(gl.SAMPLE_COVERAGE_INVERT); // false
| Specification | Status | Comment |
|---|---|---|
| WebGL 1.0 The definition of 'sampleCoverage' in that specification. | Recommendation | Initial definition. |
| OpenGL ES 2.0 The definition of 'glSampleCoverage' in that specification. | Standard | Man page of the OpenGL API. |
| Feature | Chrome | Edge | Firefox | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
| Basic support | 9 | 12 | 4 | 11 | 12 | 5.1 |
| Feature | Android webview | Chrome for Android | Edge mobile | Firefox for Android | IE mobile | Opera Android | iOS Safari |
|---|---|---|---|---|---|---|---|
| Basic support | Yes | 25 | Yes | Yes | 11 | 12 | 8.1 |
HTMLCanvasElement.getContext() – antialias parameter for the context.
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https://developer.mozilla.org/en-US/docs/Web/API/WebGLRenderingContext/sampleCoverage