WebGLRenderingContext.getActiveUniform()

The WebGLRenderingContext.getActiveUniform() method of the WebGL API returns a WebGLActiveInfo object containing size, type, and name of a uniform attribute. It is generally used when querying unknown uniforms either for debugging or generic library creation.

Syntax

WebGLActiveInfo = WebGLRenderingContext.getActiveUniform(program, index);

Parameters

program
A WebGLProgram specifying the WebGL shader program from which to obtain the uniform variable's information.
index
A GLuint specifying the index of the uniform attribute to get. This value is an index 0 to N - 1 as returned by gl.getProgramParameter(program, gl.ACTIVE_UNIFORMS).

Return value

A WebGLActiveInfo object describing the uniform.

Examples

const numUniforms = gl.getProgramParameter(program, gl.ACTIVE_UNIFORMS);
for (let i = 0; i < numUniforms; ++i) {
  const info = gl.getActiveUniform(program, i);
  console.log('name:', info.name, 'type:', info.type, 'size:', info.size);
}

Specifications

Specification Status Comment
WebGL 1.0
The definition of 'getActiveUniform' in that specification.
Recommendation Initial definition.
OpenGL ES 2.0
The definition of 'glGetActiveUniform' in that specification.
Standard Man page of the OpenGL API.

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support912411125.1
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support Yes25 Yes Yes128.1 ?

See also

Document Tags and Contributors

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