WebGLRenderingContext: getUniform() method

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

Note: This feature is available in Web Workers.

The WebGLRenderingContext.getUniform() method of the WebGL API returns the value of a uniform variable at a given location.

Syntax

getUniform(program, location)

program: A WebGLProgram containing the uniform attribute.
location: A WebGLUniformLocation object containing the location of the uniform attribute to get.

The returned type depends on the uniform type:

Uniform type	Returned type
WebGL 1 only
`boolean`	`GLBoolean`
`int`	`GLint`
`float`	`GLfloat`
`vec2`	`Float32Array` (with 2 elements)
`ivec2`	`Int32Array` (with 2 elements)
`bvec2`	`Array` of `GLBoolean` (with 2 elements)
`vec3`	`Float32Array` (with 3 elements)
`ivec3`	`Int32Array` (with 3 elements)
`bvec3`	`Array` of `GLBoolean` (with 3 elements)
`vec4`	`Float32Array` (with 4 elements)
`ivec4`	`Int32Array` (with 4 elements)
`bvec4`	`Array` of `GLBoolean` (with 4 elements)
`mat2`	`Float32Array` (with 4 elements)
`mat3`	`Float32Array` (with 9 elements)
`mat4`	`Float32Array` (with 16 elements)
`sampler2D`	`GLint`
`samplerCube`	`GLint`
Additionally available in WebGL 2
`uint`	`GLuint`
`uvec2`	`Uint32Array` (with 2 elements)
`uvec3`	`Uint32Array` (with 3 elements)
`uvec4`	`Uint32Array` (with 4 elements)
`mat2x3`	`Float32Array` (with 6 elements)
`mat2x4`	`Float32Array` (with 8 elements)
`mat3x2`	`Float32Array` (with 6 elements)
`mat3x4`	`Float32Array` (with 12 elements)
`mat4x2`	`Float32Array` (with 8 elements)
`mat4x3`	`Float32Array` (with 12 elements)
any sampler type	`GLint`

const loc = gl.getUniformLocation(program, "u_foobar");
gl.getUniform(program, loc);

Specification
WebGL Specification # 5.14.10
WebGL 2.0 Specification # 3.7.8

	desktop					mobile
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on iOS	Samsung Internet	WebView Android	WebView on iOS
`getUniform`	Chrome – Full support Chrome 9 (Release date: 2011-02-03) footnote Full support	Edge – Full support Edge 12 (Release date: 2015-07-29) footnote Full support	Firefox – Full support Firefox 4 (Release date: 2011-03-22) footnote Full support	Opera – Full support Opera 12 (Release date: 2012-06-14) footnote Full support	Safari – Full support Safari 5.1 (Release date: 2011-07-20) footnote Full support	Chrome Android – Full support Chrome Android 25 (Release date: 2013-02-27) footnote Full support	Firefox for Android – Full support Firefox for Android 4 (Release date: 2011-03-29) footnote Full support	Opera Android – Full support Opera Android 12 (Release date: 2012-02-25) footnote Full support	Safari on iOS – Full support Safari on iOS 8 (Release date: 2014-09-17) footnote Full support	Samsung Internet – Full support Samsung Internet 1.5 (Release date: 2013-09-25) footnote Full support	WebView Android – Full support WebView Android 4.4.3 (Release date: 2014-06-02) footnote Full support	WebView on iOS – Full support WebView on iOS 8 (Release date: 2014-09-17) footnote Full support

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