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);

Parameters

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

Return value

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

Examples

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

Specifications

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.

Browser compatibility

Feature Chrome Edge Firefox Internet Explorer Opera Safari Servo
Basic Support9124.011125.1No support
WebGL2No support1No support51.0No supportNo supportNo supportNo support
Feature Android Chrome for Android Edge Mobile Firefox for Android IE Mobile Opera Mobile Safari Mobile
Basic Support(Yes)25(Yes)4.011128.1
WebGL2No supportNo support(Yes)51.011No supportNo support

1. To use an experimental implementation of WebGL 2 in Chrome, you have to start Chrome with the runtime flag --enable-unsafe-es3-apis.

See also

Document Tags and Contributors

 Contributors to this page: teoli, fscholz
 Last updated by: teoli,