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WebGLRenderingContext: getUniform() method

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

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	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet
`getUniform`	9	12	4	11	12	5.1	4.4.3	25	4	12	8	1.5