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'''OpenGL extension EXT.texture_env_combine
Overview (from the spec)
New texture environment function COMBINE_EXT allows programmable
texture combiner operations, including:
REPLACE Arg0
MODULATE Arg0 * Arg1
ADD Arg0 + Arg1
ADD_SIGNED_EXT Arg0 + Arg1 - 0.5
INTERPOLATE_EXT Arg0 * (Arg2) + Arg1 * (1-Arg2)
where Arg0, Arg1 and Arg2 are derived from
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
and Arg2 is restricted to the alpha component of the corresponding source.
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/EXT/texture_env_combine.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_EXT_texture_env_combine'
GL_COMBINE_EXT = constant.Constant( 'GL_COMBINE_EXT', 0x8570 )
GL_COMBINE_RGB_EXT = constant.Constant( 'GL_COMBINE_RGB_EXT', 0x8571 )
GL_COMBINE_ALPHA_EXT = constant.Constant( 'GL_COMBINE_ALPHA_EXT', 0x8572 )
GL_RGB_SCALE_EXT = constant.Constant( 'GL_RGB_SCALE_EXT', 0x8573 )
GL_ADD_SIGNED_EXT = constant.Constant( 'GL_ADD_SIGNED_EXT', 0x8574 )
GL_INTERPOLATE_EXT = constant.Constant( 'GL_INTERPOLATE_EXT', 0x8575 )
GL_CONSTANT_EXT = constant.Constant( 'GL_CONSTANT_EXT', 0x8576 )
GL_PRIMARY_COLOR_EXT = constant.Constant( 'GL_PRIMARY_COLOR_EXT', 0x8577 )
GL_PREVIOUS_EXT = constant.Constant( 'GL_PREVIOUS_EXT', 0x8578 )
GL_SOURCE0_RGB_EXT = constant.Constant( 'GL_SOURCE0_RGB_EXT', 0x8580 )
GL_SOURCE1_RGB_EXT = constant.Constant( 'GL_SOURCE1_RGB_EXT', 0x8581 )
GL_SOURCE2_RGB_EXT = constant.Constant( 'GL_SOURCE2_RGB_EXT', 0x8582 )
GL_SOURCE0_ALPHA_EXT = constant.Constant( 'GL_SOURCE0_ALPHA_EXT', 0x8588 )
GL_SOURCE1_ALPHA_EXT = constant.Constant( 'GL_SOURCE1_ALPHA_EXT', 0x8589 )
GL_SOURCE2_ALPHA_EXT = constant.Constant( 'GL_SOURCE2_ALPHA_EXT', 0x858A )
GL_OPERAND0_RGB_EXT = constant.Constant( 'GL_OPERAND0_RGB_EXT', 0x8590 )
GL_OPERAND1_RGB_EXT = constant.Constant( 'GL_OPERAND1_RGB_EXT', 0x8591 )
GL_OPERAND2_RGB_EXT = constant.Constant( 'GL_OPERAND2_RGB_EXT', 0x8592 )
GL_OPERAND0_ALPHA_EXT = constant.Constant( 'GL_OPERAND0_ALPHA_EXT', 0x8598 )
GL_OPERAND1_ALPHA_EXT = constant.Constant( 'GL_OPERAND1_ALPHA_EXT', 0x8599 )
GL_OPERAND2_ALPHA_EXT = constant.Constant( 'GL_OPERAND2_ALPHA_EXT', 0x859A )
def glInitTextureEnvCombineEXT():
'''Return boolean indicating whether this extension is available'''
return extensions.hasGLExtension( EXTENSION_NAME )
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