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    WebGLRenderingContext.sampleCoverage()

    The WebGLRenderingContext.sampleCoverage() method of the WebGL API specifies multi-sample coverage parameters for anti-aliasing effects.

    Syntax

    void gl.sampleCoverage(value, invert);

    Parameters

    value
    A GLclampf which sets a single floating-point coverage value clamped to the range [0,1]. The default value is 1.0.
    invert
    A GLboolean which sets whether or not the coverage masks should be inverted. The default value is false.

    Return value

    None.

    Examples

    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

    Specifications

    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.

    Browser compatibility

    Feature Chrome Edge Firefox (Gecko) Internet Explorer Opera Safari
    Basic support 9 12 4.0 (2.0) 11 12 5.1
    Feature Android Chrome for Android Edge Firefox Mobile (Gecko) Firefox OS IE Mobile Opera Mobile Safari Mobile
    Basic support ? 25 (Yes) 4.0 (2.0) 1.0 ? 12 8.0

    See also

    Document Tags and Contributors

    Tags: 
     Contributors to this page: fscholz
     Last updated by: fscholz,