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'''OpenGL extension EXT.polygon_offset
Overview (from the spec)
The depth values of fragments generated by rendering polygons are
displaced by an amount that is proportional to the maximum absolute
value of the depth slope of the polygon, measured and applied in window
coordinates. This displacement allows lines (or points) and polygons
in the same plane to be rendered without interaction -- the lines
rendered either completely in front of or behind the polygons
(depending on the sign of the offset factor). It also allows multiple
coplanar polygons to be rendered without interaction, if different
offset factors are used for each polygon. Applications include
rendering hidden-line images, rendering solids with highlighted edges,
and applying `decals' to surfaces.
The official definition of this extension is available here:
http://oss.sgi.com/projects/ogl-sample/registry/EXT/polygon_offset.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_polygon_offset'
GL_POLYGON_OFFSET_EXT = constant.Constant( 'GL_POLYGON_OFFSET_EXT', 0x8037 )
glget.addGLGetConstant( GL_POLYGON_OFFSET_EXT, (1,) )
GL_POLYGON_OFFSET_FACTOR_EXT = constant.Constant( 'GL_POLYGON_OFFSET_FACTOR_EXT', 0x8038 )
glget.addGLGetConstant( GL_POLYGON_OFFSET_FACTOR_EXT, (1,) )
GL_POLYGON_OFFSET_BIAS_EXT = constant.Constant( 'GL_POLYGON_OFFSET_BIAS_EXT', 0x8039 )
glget.addGLGetConstant( GL_POLYGON_OFFSET_BIAS_EXT, (1,) )
glPolygonOffsetEXT = platform.createExtensionFunction(
'glPolygonOffsetEXT', dll=platform.GL,
extension=EXTENSION_NAME,
resultType=None,
argTypes=(constants.GLfloat, constants.GLfloat,),
doc = 'glPolygonOffsetEXT( GLfloat(factor), GLfloat(bias) ) -> None',
argNames = ('factor', 'bias',),
)
def glInitPolygonOffsetEXT():
'''Return boolean indicating whether this extension is available'''
return extensions.hasGLExtension( EXTENSION_NAME )
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