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'''OpenGL extension EXT.transform_feedback
This module customises the behaviour of the
OpenGL.raw.GL.EXT.transform_feedback to provide a more
Python-friendly API
Overview (from the spec)
This extension provides a new mode to the GL, called transform feedback,
which records selected vertex attributes for each primitive processed by
the GL. The selected attributes are written into buffer objects, and can
be written with each attribute in a separate buffer object or with all
attributes interleaved into a single buffer object. If a geometry shader
is active, the primitives recorded are those emitted by the geometry
shader. Otherwise, transform feedback captures primitives whose vertices
are transformed by a vertex shader. In either case, the primitives
captured are those generated prior to clipping. Transform feedback mode
captures the values of specified varying variables emitted from GLSL
vertex or geometry shaders.
The vertex data recorded in transform feedback mode is stored into buffer
objects as an array of vertex attributes. The regular representation and
the use of buffer objects allows the recorded data to be processed
directly by the GL without requiring CPU intervention to copy data. In
particular, transform feedback data can be used for vertex arrays (via
vertex buffer objects), as the source for pixel data (via pixel buffer
objects), as shader constant data (via the NV_parameter_buffer_object or
EXT_bindable_uniform extensions), or via any other extension that makes
use of buffer objects.
This extension introduces new query object support to allow transform
feedback mode to operate asynchronously. Query objects allow applications
to determine when transform feedback results are complete, as well as the
number of primitives processed and written back to buffer objects while in
transform feedback mode. This extension also provides a new rasterizer
discard enable, which allows applications to use transform feedback to
capture vertex attributes without rendering anything.
The official definition of this extension is available here:
http://www.opengl.org/registry/specs/EXT/transform_feedback.txt
'''
from OpenGL import platform, constants, constant, arrays
from OpenGL import extensions, wrapper
from OpenGL.GL import glget
import ctypes
from OpenGL.raw.GL.EXT.transform_feedback import *
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