WebGLRenderingContext.getUniform()

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

Syntax

any gl.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`

var loc = gl.getUniformLocation(program, 'u_foobar');
gl.getUniform(program, loc);

Specification	Status	Comment
WebGL 1.0 The definition of 'getUniform' in that specification.	Recommendation	Initial definition for WebGL.
OpenGL ES 2.0 The definition of 'glGetUniform' in that specification.	Standard	Man page of the (similar) OpenGL ES 2 API.
WebGL 2.0 The definition of 'getUniform' in that specification.	Editor's Draft	Updated definition for WebGL.
OpenGL ES 3.0 The definition of 'glGetUniform' in that specification.	Standard	Man page of the (similar) OpenGL ES 3 API.

	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
`getUniform`	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
`WebGL2`	Chrome Full support 56	Edge Full support 79	Firefox Full support 51	IE No support No	Opera Full support 43	Safari No support No	WebView Android Full support 58	Chrome Android Full support 58	Firefox Android Full support 51	Opera Android Full support 43	Safari iOS No support No	Samsung Internet Android Full support 7.0