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WebGL2RenderingContext: getActiveUniformBlockParameter() method

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

Syntax

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

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

Specifications

Specification
WebGL 2.0 Specification # 3.7.16

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