WebGL2RenderingContext.getActiveUniforms

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

See also

• WebGL2RenderingContext.getActiveUniformBlockParameter()