This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The WebGL2RenderingContext.getUniformBlockIndex() method of the WebGL 2 API retrieves the index of a uniform block within a WebGLProgram.


GLuint gl.getUniformBlockIndex(program, uniformBlockName);


A WebGLProgram containing the uniform block.
A DOMString specifying the name of the uniform block to whose index to retrieve.

Return value

A GLuint indicating the uniform block index.


// Assuming a shader with the following declaration:
// uniform UBOData {
//   mat4 foo;
// } instanceName;

// use the block name, not the instance name:
var blockIndex = gl.getUniformBlockIndex(program, 'UBOData');


Specification Status Comment
WebGL 2.0
The definition of 'getUniformBlockIndex' in that specification.
Editor's Draft Initial definition for WebGL.
OpenGL ES 3.0
The definition of 'glGetUniformBlockIndex' in that specification.
Standard Man page of the (similar) OpenGL API.

Browser compatibility

Update compatibility data on GitHub
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
getUniformBlockIndexChrome Full support 56Edge Full support 79Firefox Full support 51IE No support NoOpera Full support 43Safari No support NoWebView Android Full support 58Chrome Android Full support 58Firefox Android Full support 51Opera Android Full support 43Safari iOS No support NoSamsung Internet Android Full support 7.0


Full support  
Full support
No support  
No support

See also