'''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 )