The WebGLShaderPrecisionFormat interface is part of the WebGL API and represents the information returned by calling the WebGLRenderingContext.getShaderPrecisionFormat() method.

WebGLShaderPrecisionFormat.rangeMin Read only

The base 2 log of the absolute value of the minimum value that can be represented.

WebGLShaderPrecisionFormat.rangeMax Read only

The base 2 log of the absolute value of the maximum value that can be represented.

WebGLShaderPrecisionFormat.precision Read only

The number of bits of precision that can be represented. For integer formats this value is always 0.

A WebGLShaderPrecisionFormat object is returned by the WebGLRenderingContext.getShaderPrecisionFormat() method.

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 }

• WebGLRenderingContext.getShaderPrecisionFormat()