'''OpenGL extension NV.representative_fragment_test

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

Overview (from the spec)
	
	This extension provides a new _representative fragment test_ that allows
	implementations to reduce the amount of rasterization and fragment
	processing work performed for each point, line, or triangle primitive. For
	any primitive that produces one or more fragments that pass all other
	early fragment tests, the implementation is permitted to choose one or
	more "representative" fragments for processing and discard all other
	fragments. For draw calls rendering multiple points, lines, or triangles
	arranged in lists, strips, or fans, the representative fragment test is
	performed independently for each of those primitives.
	
	This extension is useful for applications that use an early render pass
	to determine the full set of primitives that would be visible in the final
	scene. In this render pass, such applications would set up a fragment
	shader that enables early fragment tests and writes to an image or shader
	storage buffer to record the ID of the primitive that generated the
	fragment. Without this extension, the shader would record the ID
	separately for each visible fragment of each primitive. With this
	extension, fewer stores will be performed, particularly for large
	primitives.
	
	The representative fragment test has no effect if early fragment tests are
	not enabled via the fragment shader. The set of fragments discarded by the
	representative fragment test is implementation-dependent and may vary from
	frame to frame. In some cases, the representative fragment test may not
	discard any fragments for a given primitive.
	

The official definition of this extension is available here:
http://www.opengl.org/registry/specs/NV/representative_fragment_test.txt
'''
from OpenGL import platform, constant, arrays
from OpenGL import extensions, wrapper
import ctypes
from OpenGL.raw.GL import _types, _glgets
from OpenGL.raw.GL.NV.representative_fragment_test import *
from OpenGL.raw.GL.NV.representative_fragment_test import _EXTENSION_NAME

def glInitRepresentativeFragmentTestNV():
    '''Return boolean indicating whether this extension is available'''
    from OpenGL import extensions
    return extensions.hasGLExtension( _EXTENSION_NAME )


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