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'''OpenGL extension NV.fragment_program4
This module customises the behaviour of the
OpenGL.raw.GL.NV.fragment_program4 to provide a more
Python-friendly API
Overview (from the spec)
This extension builds on the common assembly instruction set
infrastructure provided by NV_gpu_program4, adding fragment
program-specific features.
This extension provides interpolation modifiers to fragment program
attributes allowing programs to specify that specified attributes be
flat-shaded (constant over a primitive), centroid-sampled (multisample
rendering), or interpolated linearly in screen space. The set of input
and output bindings provided includes all bindings supported by
ARB_fragment_program. Additional input bindings are provided to determine
whether fragments were generated by front- or back-facing primitives
("fragment.facing"), to identify the individual primitive used to generate
the fragment ("primitive.id"), and to determine distances to user clip
planes ("fragment.clip[n]"). Additionally generic input attributes allow
a fragment program to receive a greater number of attributes from previous
pipeline stages than possible using only the pre-defined fixed-function
attributes.
By and large, programs written to ARB_fragment_program can be ported
directly by simply changing the program header from "!!ARBfp1.0" to
"!!NVfp4.0", and then modifying instructions to take advantage of the
expanded feature set. There are a small number of areas where this
extension is not a functional superset of previous fragment program
extensions, which are documented in the NV_gpu_program4 specification.
The official definition of this extension is available here:
http://www.opengl.org/registry/specs/NV/fragment_program4.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.fragment_program4 import *
from OpenGL.raw.GL.NV.fragment_program4 import _EXTENSION_NAME
def glInitFragmentProgram4NV():
'''Return boolean indicating whether this extension is available'''
from OpenGL import extensions
return extensions.hasGLExtension( _EXTENSION_NAME )
### END AUTOGENERATED SECTION
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