WebGLRenderingContext.getShaderPrecisionFormat() - Web APIs 编辑

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

Browser compatibility

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See also

• WebGLShaderPrecisionFormat