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'''OpenGL extension SGIX.texture_scale_bias
Overview (from the spec)
This extension adds scale, bias, and clamp to [0, 1] operations to the
texture pipeline.
These operations are applied to the filtered result of a texture lookup,
before that result is used in the texture environment equations and
before the texture color lookup table of SGI_texture_color_table,
if that extension exists.
These operations are distinct from the scale, bias, and clamp operations
that appear in the SGI_color_table extension, which are used to
define a color lookup table.
Scale and bias operations on texels can be used to better utilize the
color resolution of a particular texture internal format (see EXT_texture).
The official definition of this extension is available here:
http://oss.sgi.com/projects/ogl-sample/registry/SGIX/texture_scale_bias.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_SGIX_texture_scale_bias'
GL_POST_TEXTURE_FILTER_BIAS_SGIX = constant.Constant( 'GL_POST_TEXTURE_FILTER_BIAS_SGIX', 0x8179 )
GL_POST_TEXTURE_FILTER_SCALE_SGIX = constant.Constant( 'GL_POST_TEXTURE_FILTER_SCALE_SGIX', 0x817A )
GL_POST_TEXTURE_FILTER_BIAS_RANGE_SGIX = constant.Constant( 'GL_POST_TEXTURE_FILTER_BIAS_RANGE_SGIX', 0x817B )
glget.addGLGetConstant( GL_POST_TEXTURE_FILTER_BIAS_RANGE_SGIX, (1,) )
GL_POST_TEXTURE_FILTER_SCALE_RANGE_SGIX = constant.Constant( 'GL_POST_TEXTURE_FILTER_SCALE_RANGE_SGIX', 0x817C )
glget.addGLGetConstant( GL_POST_TEXTURE_FILTER_SCALE_RANGE_SGIX, (1,) )
def glInitTextureScaleBiasSGIX():
'''Return boolean indicating whether this extension is available'''
return extensions.hasGLExtension( EXTENSION_NAME )
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