Web/API/WebGLRenderingContext/getShaderPrecisionFormat

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

WebGLShaderPrecisionFormat gl.getShaderPrecisionFormat(shaderType, precisionType);

Parameters

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.

Return value

A WebGLShaderPrecisionFormat object or null, if an error occurs.

Exceptions

gl.INVALID_ENUM if the shader or precision types aren't recognized.
gl.INVALID_OPERATION if 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.

var canvas = document.getElementById('canvas');
var gl = canvas.getContext('webgl');

gl.getShaderPrecisionFormat(gl.VERTEX_SHADER, gl.MEDIUM_FLOAT);
// WebGLShaderPrecisionFormat { rangeMin: 127, rangeMax: 127, precision: 23 }

Specifications

Specification	Status	Comment
WebGL 1.0The definition of 'getShaderPrecisionFormat' in that specification.	Recommendation	Initial definition.
OpenGL ES 2.0The definition of 'glGetShaderPrecisionFormat' in that specification.	Standard	Man page of the (similar) OpenGL API.

Browser compatibility

The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`getShaderPrecisionFormat`	Chrome Full support 9	Edge Full support 12	Firefox Full support 4	IE Full support 11	Opera Full support 12	Safari Full support 5.1	WebView Android Full support Yes	Chrome Android Full support 25	Firefox Android Full support Yes	Opera Android Full support 12	Safari iOS Full support 8	Samsung Internet Android Full support 1.5

Legend

Full support: Full support