OpenGL extension ARB.instanced_arrays
This module customises the behaviour of the
OpenGL.raw.GL.ARB.instanced_arrays 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.
In particular, this extension specifies an alternative to the
read-only shader variable introduced by ARB_draw_instanced. It
uses the same draw calls introduced by that extension, but
redefines them so that a vertex shader can instead use vertex
array attributes as a source of instance data.
This extension introduces an array "divisor" for generic
vertex array attributes, which when non-zero specifies that the
attribute is "instanced." An instanced attribute does not
advance per-vertex as usual, but rather after every <divisor>
conceptual draw calls.
(Attributes which aren't instanced are repeated in their entirety
for every conceptual draw call.)
By specifying transform data in an instanced attribute or series
of instanced attributes, vertex shaders can, in concert with the
instancing draw calls, draw multiple instances of an object with
one draw call.
The official definition of this extension is available here:
|EXTENSION_NAME = 'GL_ARB_instanced_arrays'|
GL_VERTEX_ATTRIB_ARRAY_DIVISOR_ARB = GL_VERTEX_ATTRIB_ARRAY_DIVISOR_ARB
__file__ = '/home/mcfletch/pylive/OpenGL/GL/ARB/instanced_arrays.pyc'
__name__ = 'OpenGL.GL.ARB.instanced_arrays'
__package__ = 'OpenGL.GL.ARB'
glVertexAttribDivisorARB = <OpenGL.platform.baseplatform.glVertexAttribDivisorARB object at 0x731e1d0>