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'''OpenGL extension NV.texture_shader3
Overview (from the spec)
NV_texture_shader3 extends the NV_texture_shader functionality by
adding several new texture shader operations, extending several
existing texture shader operations, adding a new HILO8 internal
format, and adding new and more flexible re-mapping modes for dot
product and dependent texture shader operations.
See the NV_texture_shader extension for information about the
texture shader operational model.
The fourteen new texture shader operations are:
<offset textures>
24. OFFSET_PROJECTIVE_TEXTURE_2D_NV - Transforms the signed (ds,dt)
components of a previous texture unit by a 2x2 floating-point
matrix and then uses the result to offset the stage's texture
coordinates for a 2D non-projective texture.
25. OFFSET_PROJECTIVE_TEXTURE_2D_SCALE_NV - Same as above except
the magnitude component of the previous texture unit result
scales the red, green, and blue components of the unsigned RGBA
texture 2D access.
26. OFFSET_PROJECTIVE_TEXTURE_RECTANGLE_NV - Similar to
OFFSET_TEXTURE_2D_NV except that the texture access is into a
rectangular non-projective texture.
27. OFFSET_PROJECTIVE_TEXTURE_RECTANGLE_SCALE_NV - Similar to
OFFSET_PROJECTIVE_TEXTURE_2D_SCALE_NV except that the texture
access is into a rectangular non-projective texture.
28. OFFSET_HILO_TEXTURE_2D_NV - Similar to OFFSET_TEXTURE_2D_NV
but uses a (higher-precision) HILO base format texture rather
than a DSDT-type base format.
29. OFFSET_HILO_TEXTURE_RECTANGLE_NV - Similar to
OFFSET_TEXTURE_RECTANGLE_NV but uses a (higher-precision)
HILO base format texture rather than a DSDT-type base format.
30. OFFSET_HILO_PROJECTIVE_TEXTURE_2D_NV - Similar to
OFFSET_PROJECTIVE_TEXTURE_2D_NV but uses a (higher-precision)
HILO base format texture rather than a DSDT-type base format.
31. OFFSET_HILO_PROJECTIVE_TEXTURE_RECTANGLE_NV - Similar to
OFFSET_PROJECTIVE_TEXTURE_RECTANGLE_NV but uses a
(higher-precision) HILO base format texture rather than a
DSDT-type base format.
(There are no "offset HILO texture scale" operations because
HILO textures have only two components with no third component
for scaling.)
<dependent textures>
32. DEPENDENT_HILO_TEXTURE_2D_NV - Converts the hi and lo components
of a previous shader HILO result into an (s,t) texture coordinate
set to access a 2D non-projective texture.
33. DEPENDENT_RGB_TEXTURE_3D_NV - Converts the red, green, and
blue components of a previous shader RGBA result into an (s,t,r)
texture coordinate set to access a 3D non-projective texture.
34. DEPENDENT_RGB_TEXTURE_CUBE_MAP_NV - Converts the red, green,
and blue components of a previous shader RGBA result into an
(s,t,r) texture coordinate set to access a cube map texture.
<dot product textures>
35. DOT_PRODUCT_TEXTURE_1D_NV - Computes a dot product in the manner
of the DOT_PRODUCT_NV operation and uses the result as the s
texture coordinate to access a 2D non-projective texture.
36. DOT_PRODUCT_PASS_THROUGH_NV - Computes a dot product in the
manner of the DOT_PRODUCT_NV operation and the result is [0,1]
clamped and smeared to generate the texture unit RGBA result.
<dot product depth replace>
37. DOT_PRODUCT_AFFINE_DEPTH_REPLACE_NV - Computes a dot product
in the manner of the DOT_PRODUCT_NV operation and the result
is [0,1] clamped and replaces the fragment's window-space
depth value. The texture unit RGBA result is (0,0,0,0).
Two new internal texture formats have been added: HILO8_NV and
SIGNED_HILO8_NV. These texture formats allow HILO textures to be
stored in half the space; still the filtering for these internal
texture formats is done with 16-bit precision.
One new unsigned RGBA dot product mapping mode (FORCE_BLUE_TO_ONE_NV)
forces the blue component to be 1.0 before computing a dot product.
The official definition of this extension is available here:
http://oss.sgi.com/projects/ogl-sample/registry/NV/texture_shader3.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_shader3'
GL_OFFSET_PROJECTIVE_TEXTURE_2D_NV = constant.Constant( 'GL_OFFSET_PROJECTIVE_TEXTURE_2D_NV', 0x8850 )
GL_OFFSET_PROJECTIVE_TEXTURE_2D_SCALE_NV = constant.Constant( 'GL_OFFSET_PROJECTIVE_TEXTURE_2D_SCALE_NV', 0x8851 )
GL_OFFSET_PROJECTIVE_TEXTURE_RECTANGLE_NV = constant.Constant( 'GL_OFFSET_PROJECTIVE_TEXTURE_RECTANGLE_NV', 0x8852 )
GL_OFFSET_PROJECTIVE_TEXTURE_RECTANGLE_SCALE_NV = constant.Constant( 'GL_OFFSET_PROJECTIVE_TEXTURE_RECTANGLE_SCALE_NV', 0x8853 )
GL_OFFSET_HILO_TEXTURE_2D_NV = constant.Constant( 'GL_OFFSET_HILO_TEXTURE_2D_NV', 0x8854 )
GL_OFFSET_HILO_TEXTURE_RECTANGLE_NV = constant.Constant( 'GL_OFFSET_HILO_TEXTURE_RECTANGLE_NV', 0x8855 )
GL_OFFSET_HILO_PROJECTIVE_TEXTURE_2D_NV = constant.Constant( 'GL_OFFSET_HILO_PROJECTIVE_TEXTURE_2D_NV', 0x8856 )
GL_OFFSET_HILO_PROJECTIVE_TEXTURE_RECTANGLE_NV = constant.Constant( 'GL_OFFSET_HILO_PROJECTIVE_TEXTURE_RECTANGLE_NV', 0x8857 )
GL_DEPENDENT_HILO_TEXTURE_2D_NV = constant.Constant( 'GL_DEPENDENT_HILO_TEXTURE_2D_NV', 0x8858 )
GL_DEPENDENT_RGB_TEXTURE_3D_NV = constant.Constant( 'GL_DEPENDENT_RGB_TEXTURE_3D_NV', 0x8859 )
GL_DEPENDENT_RGB_TEXTURE_CUBE_MAP_NV = constant.Constant( 'GL_DEPENDENT_RGB_TEXTURE_CUBE_MAP_NV', 0x885A )
GL_DOT_PRODUCT_PASS_THROUGH_NV = constant.Constant( 'GL_DOT_PRODUCT_PASS_THROUGH_NV', 0x885B )
GL_DOT_PRODUCT_TEXTURE_1D_NV = constant.Constant( 'GL_DOT_PRODUCT_TEXTURE_1D_NV', 0x885C )
GL_DOT_PRODUCT_AFFINE_DEPTH_REPLACE_NV = constant.Constant( 'GL_DOT_PRODUCT_AFFINE_DEPTH_REPLACE_NV', 0x885D )
GL_HILO8_NV = constant.Constant( 'GL_HILO8_NV', 0x885E )
GL_SIGNED_HILO8_NV = constant.Constant( 'GL_SIGNED_HILO8_NV', 0x885F )
GL_FORCE_BLUE_TO_ONE_NV = constant.Constant( 'GL_FORCE_BLUE_TO_ONE_NV', 0x8860 )
def glInitTextureShader3NV():
'''Return boolean indicating whether this extension is available'''
return extensions.hasGLExtension( EXTENSION_NAME )
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