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

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support912411125.1
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support Yes25 Yes Yes128.1 Yes

See also

Document Tags and Contributors

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