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'''OpenGL extension NV.register_combiners2
This module customises the behaviour of the
OpenGL.raw.GL.NV.register_combiners2 to provide a more
Python-friendly API
Overview (from the spec)
The NV_register_combiners extension provides a powerful fragment
coloring mechanism. This specification extends the register combiners
functionality to support more color constant values that are unique
for each general combiner stage.
The base register combiners functionality supports only two color
constants. These two constants are available in every general
combiner stage and in the final combiner.
When many general combiner stages are supported, more than two
unique color constants is often required. The obvious way to extend
the register combiners is to add several more color constant
registers. But adding new unique color constant registers is
expensive for hardware implementation because every color constant
register must be available as an input to any stage.
In practice however, it is the total set of general combiner stages
that requires more color constants, not each and every individual
general combiner stage. Each individual general combiner stage
typically requires only one or two color constants.
By keeping two color constant registers but making these two registers
contain two unique color constant values for each general combiner
stage, the hardware expense of supporting multiple color constants
is minimized. Additionally, this scheme scales appropriately as
more general combiner stages are added.
The official definition of this extension is available here:
http://www.opengl.org/registry/specs/NV/register_combiners2.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.register_combiners2 import *
from OpenGL.raw.GL.NV.register_combiners2 import _EXTENSION_NAME
def glInitRegisterCombiners2NV():
'''Return boolean indicating whether this extension is available'''
from OpenGL import extensions
return extensions.hasGLExtension( _EXTENSION_NAME )
# INPUT glCombinerStageParameterfvNV.params size not checked against 'pname'
glCombinerStageParameterfvNV=wrapper.wrapper(glCombinerStageParameterfvNV).setInputArraySize(
'params', None
)
glGetCombinerStageParameterfvNV=wrapper.wrapper(glGetCombinerStageParameterfvNV).setOutput(
'params',size=_glgets._glget_size_mapping,pnameArg='pname',orPassIn=True
)
### END AUTOGENERATED SECTION
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