WebGL2RenderingContext: getActiveUniforms() method

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2021.

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

Syntax

js
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

js
const uniformIndices = gl.getUniformIndices(program, [
  "UBORed",
  "UBOGreen",
  "UBOBlue",
]);
const uniformOffsets = gl.getActiveUniforms(
  program,
  uniformIndices,
  gl.UNIFORM_OFFSET,
);

Specifications

Specification
WebGL 2.0 Specification
# 3.7.16

Browser compatibility

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See also