WebGLRenderingContext: getShaderPrecisionFormat() 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.
The
WebGLRenderingContext.getShaderPrecisionFormat() method of
the WebGL API returns a new
WebGLShaderPrecisionFormat object describing the range and precision for
the specified shader numeric format.
Syntax
getShaderPrecisionFormat(shaderType, precisionType)
Parameters
shaderType-
Either a
gl.FRAGMENT_SHADERor agl.VERTEX_SHADER. precisionType-
A precision type value. Either
gl.LOW_FLOAT,gl.MEDIUM_FLOAT,gl.HIGH_FLOAT,gl.LOW_INT,gl.MEDIUM_INT, orgl.HIGH_INT.
Return value
A WebGLShaderPrecisionFormat object or null, if an error
occurs.
Exceptions
gl.INVALID_ENUMif the shader or precision types aren't recognized.gl.INVALID_OPERATIONif the shader compiler isn't supported.
Examples
The following code gets the precision format of a gl.VERTEX_SHADER with a
gl.MEDIUM_FLOAT precision type.
const canvas = document.getElementById("canvas");
const gl = canvas.getContext("webgl");
gl.getShaderPrecisionFormat(gl.VERTEX_SHADER, gl.MEDIUM_FLOAT);
// WebGLShaderPrecisionFormat { rangeMin: 127, rangeMax: 127, precision: 23 }
Specifications
| Specification |
|---|
| WebGL Specification # 5.14.9 |
Browser compatibility
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