OpenGL extension ARB.draw_instanced
This module customises the behaviour of the
OpenGL.raw.GL.ARB.draw_instanced to provide a more
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:
|EXTENSION_NAME = 'GL_ARB_draw_instanced'|
__file__ = '/home/mcfletch/pylive/OpenGL/GL/ARB/draw_instanced.pyc'
__name__ = 'OpenGL.GL.ARB.draw_instanced'
__package__ = 'OpenGL.GL.ARB'
glDrawArraysInstancedARB = <OpenGL.platform.baseplatform.glDrawArraysInstancedARB object at 0x72fecd0>
glDrawElementsInstancedARB = <OpenGL.platform.baseplatform.glDrawElementsInstancedARB object at 0x72fed10>