'''OpenGL extension ARB.transform_feedback3

This module customises the behaviour of the 
OpenGL.raw.GL.ARB.transform_feedback3 to provide a more 
Python-friendly API

Overview (from the spec)
	
	This extension further extends the transform feedback capabilities
	provided by the EXT_transform_feedback, NV_transform_feedback, and
	NV_transform_feedback2 extensions.  Those extensions provided a new
	transform feedback mode, where selected vertex attributes can be recorded
	to a buffer object for each primitive processed by the GL.
	
	This extension provides increased flexibility in how vertex attributes can
	be written to buffer objects.  Previous extensions allowed applications to
	record a set of attributes interleaved into a single buffer object
	(interleaved mode) or to record into multiple objects, but with only a
	single attribute per buffer (separate mode).  This extension extends
	interleaved mode to write into multiple buffers, with multiple attributes
	per buffer.  This capability is supported for all three styles of
	transform feedback:
	
	  - "EXT"-style GLSL transform feedback (EXT_transform_feedback), where a
	     list of varyings is provided prior to linking a program object and is
	     used whenever that program object is used.
	
	  - "NV"-style GLSL transform feedback (NV_transform_feedback), where
	    "locations" of active varyings are queried after linking and are then
	    passed to a function that sets the active transform feedback varyings
	    for the program object.  Unlike the "EXT"-style mode, the set of
	    varyings to capture can be changed without relinking.
	
	  - Transform feedback for fixed-function or assembly vertex/geometry
	    shaders (NV_transform_feedback), where applications specify a set of
	    canonical attribute enums/numbers to capture.
	
	Additionally, this extension adds new support for multiple separate
	vertex streams.  New geometry shader functionality provided by the
	ARB_gpu_shader5 and NV_gpu_program5 extensions allows geometry shaders
	to direct each vertex arbitrarily at a specified vertex stream.  For
	example, a geometry program might write each "regular" vertex it emits
	to one vertex stream while writing some per-primitive data it computes
	to a second vertex stream.  This extension allows applications to
	choose a vertex stream for each buffer object it writes to, and allows
	the vertices written to each vertex stream to be recorded in separate
	buffer objects.  Only one stream may be selected for rasterization,
	and in the initial implementation, the geometry shader output topology
	must be POINTS if multiple streams are used.  When geometry shaders
	are not used, or when an old geometry shader not writing multiple
	streams is used, all vertices produced by the GL are directed at the
	stream numbered zero.  The set of transform feedback-related query
	targets is extended to accommodate multiple vertex streams, so it is
	possible to count the number of processed and recorded primitives for
	each stream separately.

The official definition of this extension is available here:
http://www.opengl.org/registry/specs/ARB/transform_feedback3.txt
'''
from OpenGL import platform, constants, constant, arrays
from OpenGL import extensions, wrapper
from OpenGL.GL import glget
import ctypes
from OpenGL.raw.GL.ARB.transform_feedback3 import *
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