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WebGL2RenderingContext.getActiveUniforms()

This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.

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

FeatureChromeFirefoxEdgeInternet ExplorerOperaSafari
Basic Support5651.0(No)(No)43(No)
FeatureAndroidChrome for AndroidEdge mobileFirefox for AndroidIE mobileOpera AndroidiOS Safari
Basic Support(No)(No)(No)(No)(No)(No)(No)

See also

Document Tags and Contributors

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