OpenGL.GL.ARB.indirect_parameters

OpenGL extension ARB.indirect_parameters

This module customises the behaviour of the OpenGL.raw.GL.ARB.indirect_parameters to provide a more Python-friendly API

Overview (from the spec)

OpenGL 4.3 (with the introduction of the GL_ARB_multi_draw_indirect extension) enhanced the ability of OpenGL to allow a large sets of parameters for indirect draws (introduced with OpenGL 4.0) into a buffer object and dispatch the entire list with one API call. This allows, for example, a shader (such as a compute shader via shader storage buffers, or a geometry shader via transform feedback) to produce lists of draw commands that can then be consumed by OpenGL without a server-client round trip. However, when a variable and potentially unknown number of draws are produced by such a shader, it becomes difficult to know how many draws are in the output array(s). Applications must resort to techniques such as transform feedback primitive queries, or mapping buffers containing the content of atomic counters, which can cause stalls or bubbles in the OpenGL pipeline.

This extension introduces the concept of the "parameter buffer", which is a target allowing buffers to store parameters for certain drawing commands. Also in this extension, new variants of MultiDrawArraysIndirect and MultiDrawElementsIndirect are introduced that source some of their parameters from this buffer. Further commands could potentially be introduced that source other parameters from a buffer.

The official definition of this extension is available here: http://www.opengl.org/registry/specs/ARB/indirect_parameters.txt