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'''OpenGL extension NV.texture_env_combine4
Overview (from the spec)
New texture environment function COMBINE4_NV allows programmable
texture combiner operations, including
ADD Arg0 * Arg1 + Arg2 * Arg3
ADD_SIGNED_EXT Arg0 * Arg1 + Arg2 * Arg3 - 0.5
where Arg0, Arg1, Arg2 and Arg3 are derived from
ZERO the value 0
PRIMARY_COLOR_EXT primary color of incoming fragment
TEXTURE texture color of corresponding texture unit
CONSTANT_EXT texture environment constant color
PREVIOUS_EXT result of previous texture environment; on
texture unit 0, this maps to PRIMARY_COLOR_EXT
TEXTURE<n>_ARB texture color of the <n>th texture unit
In addition, the result may be scaled by 1.0, 2.0 or 4.0.
The official definition of this extension is available here:
http://oss.sgi.com/projects/ogl-sample/registry/NV/texture_env_combine4.txt
Automatically generated by the get_gl_extensions script, do not edit!
'''
from OpenGL import platform, constants, constant, arrays
from OpenGL import extensions
from OpenGL.GL import glget
import ctypes
EXTENSION_NAME = 'GL_NV_texture_env_combine4'
GL_COMBINE4_NV = constant.Constant( 'GL_COMBINE4_NV', 0x8503 )
GL_SOURCE3_RGB_NV = constant.Constant( 'GL_SOURCE3_RGB_NV', 0x8583 )
GL_SOURCE3_ALPHA_NV = constant.Constant( 'GL_SOURCE3_ALPHA_NV', 0x858B )
GL_OPERAND3_RGB_NV = constant.Constant( 'GL_OPERAND3_RGB_NV', 0x8593 )
GL_OPERAND3_ALPHA_NV = constant.Constant( 'GL_OPERAND3_ALPHA_NV', 0x859B )
def glInitTextureEnvCombine4NV():
'''Return boolean indicating whether this extension is available'''
return extensions.hasGLExtension( EXTENSION_NAME )
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