WebGL2RenderingContext.getActiveUniforms()

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

The WebGL2RenderingContext.getActiveUniforms() method of the WebGL 2 API retrieves information about active uniforms within a WebGLProgram.

Syntax

any gl.getActiveUniforms(program, uniformIndices, pname);

Parameters

program
A WebGLProgram containing the active uniforms.
uniformIndices
An Array of GLuint specifying the indices of the active uniforms to query.
pname
A GLenum specifying which information to query. Possible values:
  • gl.UNIFORM_TYPE: Returns an Array of GLenum indicating the types of the uniforms.
  • gl.UNIFORM_SIZE: Returns an Array of GLuint indicating the sizes of the uniforms.
  • gl.UNIFORM_BLOCK_INDEX: Returns an Array of GLint indicating the block indices of the uniforms.
  • gl.UNIFORM_OFFSET: Returns an Array of GLint indicating the uniform buffer offsets.
  • gl.UNIFORM_ARRAY_STRIDE: Returns an Array of GLint indicating the strides between the elements.
  • gl.UNIFORM_MATRIX_STRIDE: Returns an Array of GLint indicating the strides between columns of a column-major matrix or a row-major matrix.
  • gl.UNIFORM_IS_ROW_MAJOR: Returns an Array of GLboolean indicating whether each of the uniforms is a row-major matrix or not.

Return value

Depends on which information is requested using the pname parameter.

Examples

var uniformIndices = gl.getUniformIndices(program, ['UBORed', 'UBOGreen', 'UBOBlue']);
var uniformOffsets = gl.getActiveUniforms(program, uniformIndices, gl.UNIFORM_OFFSET);

Specifications

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

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidiOS SafariSamsung Internet
Basic supportChrome Full support 56Edge No support NoFirefox Full support 51IE No support NoOpera Full support 43Safari No support NoWebView Android Full support 58Chrome Android Full support 58Edge Mobile No support NoFirefox Android Full support 51Opera Android Full support 43Safari iOS No support NoSamsung Internet Android Full support 7.0

Legend

Full support  
Full support
No support  
No support

See also

Document Tags and Contributors

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