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 <var>gl.</var>getShaderPrecisionFormat<var>(shaderType, precisionType);</var>

Parameters

shaderType

Either a FRAGMENT_SHADER or a VERTEX_SHADER.

precisionType

A precision type value. Either LOW_FLOAT, MEDIUM_FLOAT, HIGH_FLOAT, LOW_INT, MEDIUM_INT, or 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 VERTEX_SHADER with a 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

Browser compatibility

See also

• WebGLShaderPrecisionFormat