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'''OpenGL extension NV.read_buffer
This module customises the behaviour of the
OpenGL.raw.GLES2.NV.read_buffer to provide a more
Python-friendly API
Overview (from the spec)
Unextended OpenGL ES 2.0 only supports using ReadPixels to read from
the default color buffer of the currently-bound framebuffer.
However, it is useful for debugging to be able to read from
non-default color buffers. Particularly, when the NV_draw_buffers
extension is supported, each framebuffer may contain multiple color
buffers. This extension provides a mechanism to select which color
buffer to read from.
This document describes two extensions to allow an implementation to
support a subset of the total functionality.
The NV_read_buffer extension adds the command ReadBufferNV, which is
used to select which color buffer of the currently-bound framebuffer
to use as the source for subsequent calls to ReadPixels,
CopyTexImage2D, and CopyTexSubImage2D. If the system-provided
framebuffer is bound, then ReadBufferNV accepts value BACK. If a
user-created FBO is bound, then ReadBufferNV accepts COLOR_ATTACHMENT0.
Additionally, if the NV_draw_buffers extension is supported,
ReadBufferNV accepts COLOR_ATTACHMENTn_NV (n is 0 to 15).
The NV_read_buffer_front extension requires NV_read_buffer and adds
the ability to select the system-provided FRONT color buffer as the
source for read operations when the system-provided framebuffer is
bound and contains both a front and back buffer.
The official definition of this extension is available here:
http://www.opengl.org/registry/specs/NV/read_buffer.txt
'''
from OpenGL import platform, constant, arrays
from OpenGL import extensions, wrapper
import ctypes
from OpenGL.raw.GLES2 import _types, _glgets
from OpenGL.raw.GLES2.NV.read_buffer import *
from OpenGL.raw.GLES2.NV.read_buffer import _EXTENSION_NAME
def glInitReadBufferNV():
'''Return boolean indicating whether this extension is available'''
from OpenGL import extensions
return extensions.hasGLExtension( _EXTENSION_NAME )
### END AUTOGENERATED SECTION
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