OpenGL.GL.ARB.draw_instanced

OpenGL extension ARB.draw_instanced

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

Overview (from the spec)

A common use case in GL for some applications is to be able to draw the same object, or groups of similar objects that share vertex data, primitive count and type, multiple times. This extension provides a means of accelerating such use cases while restricting the number of API calls, and keeping the amount of duplicate data to a minimum.

This extension introduces two draw calls which are conceptually equivalent to a series of draw calls. Each conceptual call in this series is considered an "instance" of the actual draw call.

This extension also introduces a read-only built-in variable to GLSL which contains the "instance ID." This variable initially contains 0, but increases by one after each conceptual draw call.

By using the instance ID or multiples thereof as an index into a uniform array containing transform data, vertex shaders can draw multiple instances of an object with a single draw call.

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