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    WebGL2RenderingContext.getActiveUniformBlockParameter()

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

    Syntax

    any gl.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

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

    Specifications

    Specification Status Comment
    WebGL 2.0
    The definition of 'getActiveUniformBlockParameter' in that specification.    		 Editor's Draft Initial definition for WebGL.
    OpenGL ES 3.0
    The definition of 'glGetActiveUniformBlockiv' in that specification.    		 Standard Man page of the (similar) OpenGL API.

    Browser compatibility

    Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
    Basic support No support [2] Nightly build [1] No support No support No support
    Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
    Basic support No support No support No support No support No support No support

    [1] WebGL 2 is enabled by default in Firefox Nightly. To enable it in a release version of Firefox, set the preference webgl.enable-prototype-webgl2 to true in about:config.

    [2] To use an experimental implementation of WebGL 2 in Chrome, you have to start Chrome with the runtime flag --enable-unsafe-es3-apis.

    See also

    Document Tags and Contributors

    Tags: 
     Contributors to this page: fscholz
     Last updated by: fscholz,