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'''OpenGL extension NV.texgen_emboss
Overview (from the spec)
This extension provides a new texture coordinate generation mode
suitable for multitexture-based embossing (or bump mapping) effects.
Given two texture units, this extension generates the texture
coordinates of a second texture unit (an odd-numbered texture unit)
as a perturbation of a first texture unit (an even-numbered texture
unit one less than the second texture unit). The perturbation is
based on the normal, tangent, and light vectors. The normal vector
is supplied by glNormal; the light vector is supplied as a direction
vector to a specified OpenGL light's position; and the tanget
vector is supplied by the second texture unit's current texture
coordinate. The perturbation is also scaled by program-supplied
scaling constants.
If both texture units are bound to the same texture representing a
height field, by subtracting the difference between the resulting two
filtered texels, programs can achieve a per-pixel embossing effect.
The official definition of this extension is available here:
http://oss.sgi.com/projects/ogl-sample/registry/NV/texgen_emboss.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_texgen_emboss'
GL_EMBOSS_LIGHT_NV = constant.Constant( 'GL_EMBOSS_LIGHT_NV', 0x855D )
GL_EMBOSS_CONSTANT_NV = constant.Constant( 'GL_EMBOSS_CONSTANT_NV', 0x855E )
GL_EMBOSS_MAP_NV = constant.Constant( 'GL_EMBOSS_MAP_NV', 0x855F )
def glInitTexgenEmbossNV():
'''Return boolean indicating whether this extension is available'''
return extensions.hasGLExtension( EXTENSION_NAME )
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