Baseline Widely available
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The WebGLRenderingContext.getShaderPrecisionFormat() method of the WebGL API returns a new WebGLShaderPrecisionFormat object describing the range and precision for the specified shader numeric format.
getShaderPrecisionFormat(shaderType, precisionType)
shaderType
Either a gl.FRAGMENT_SHADER or a gl.VERTEX_SHADER.
precisionType
A precision type value. Either gl.LOW_FLOAT, gl.MEDIUM_FLOAT, gl.HIGH_FLOAT, gl.LOW_INT, gl.MEDIUM_INT, or gl.HIGH_INT.
A WebGLShaderPrecisionFormat object or null, if an error occurs.
gl.INVALID_ENUM if the shader or precision types aren't recognized.gl.INVALID_OPERATION if the shader compiler isn't supported.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 }
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