WebGL2RenderingContext: getActiveUniformBlockParameter() method

The WebGL2RenderingContext.getActiveUniformBlockParameter() method of the WebGL 2 API retrieves information about an active uniform block within a WebGLProgram.

Syntax

js

getActiveUniformBlockParameter(program, uniformBlockIndex, pname)

Parameters

program

A WebGLProgram containing the active uniform block.

uniformBlockIndex

A GLuint specifying the index of the active uniform block within the program.

pname

A GLenum specifying which information to query. Possible values:

gl.UNIFORM_BLOCK_BINDING

Returns a GLuint indicating the uniform buffer binding point.

gl.UNIFORM_BLOCK_DATA_SIZE

Returns a GLuint indicating the minimum total buffer object size.

gl.UNIFORM_BLOCK_ACTIVE_UNIFORMS

Returns a GLuint indicating the number of active uniforms in the uniform block.

gl.UNIFORM_BLOCK_ACTIVE_UNIFORM_INDICES

Returns a Uint32Array indicating the list of active uniforms in the uniform block.

gl.UNIFORM_BLOCK_REFERENCED_BY_VERTEX_SHADER

Returns a GLboolean indicating whether the uniform block is referenced by the vertex shader.

gl.UNIFORM_BLOCK_REFERENCED_BY_FRAGMENT_SHADER

Returns a GLboolean indicating whether the uniform block is referenced by the fragment shader.

Return value

Depends on which information is requested using the pname parameter. If an error occurs, null is returned.

Examples

js

const blockSize = gl.getActiveUniformBlockParameter(
  program,
  blockIndex,
  gl.UNIFORM_BLOCK_DATA_SIZE,
);

Specifications

Specification
WebGL 2.0 Specification
# 3.7.16

Browser compatibility

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See also