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'''OpenGL extension EXT.cull_vertex
Overview (from the spec)
This extension introduces a method for culling vertexes in object
space based on the value of the dot product between the normal at
the vertex and a culling eye direction.
Culling a polygon by examining its vertexes in object space can be
more efficient than screen space polygon culling since the transformation
to screen space (which may include a division by w) can be avoided for
culled vertexes. Also, vertex culling can be computed before vertexes
are assembled into primitives. This is a useful property when drawing
meshes with shared vertexes, since a vertex can be culled once, and the
resulting state can be used for all primitives which share the vertex.
The official definition of this extension is available here:
http://oss.sgi.com/projects/ogl-sample/registry/EXT/cull_vertex.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_cull_vertex'
GL_CULL_VERTEX_EXT = constant.Constant( 'GL_CULL_VERTEX_EXT', 0x81AA )
GL_CULL_VERTEX_EYE_POSITION_EXT = constant.Constant( 'GL_CULL_VERTEX_EYE_POSITION_EXT', 0x81AB )
GL_CULL_VERTEX_OBJECT_POSITION_EXT = constant.Constant( 'GL_CULL_VERTEX_OBJECT_POSITION_EXT', 0x81AC )
glCullParameterdvEXT = platform.createExtensionFunction(
'glCullParameterdvEXT', dll=platform.GL,
extension=EXTENSION_NAME,
resultType=None,
argTypes=(constants.GLenum, arrays.GLdoubleArray,),
doc = 'glCullParameterdvEXT( GLenum(pname), GLdoubleArray(params) ) -> None',
argNames = ('pname', 'params',),
)
glCullParameterfvEXT = platform.createExtensionFunction(
'glCullParameterfvEXT', dll=platform.GL,
extension=EXTENSION_NAME,
resultType=None,
argTypes=(constants.GLenum, arrays.GLfloatArray,),
doc = 'glCullParameterfvEXT( GLenum(pname), GLfloatArray(params) ) -> None',
argNames = ('pname', 'params',),
)
def glInitCullVertexEXT():
'''Return boolean indicating whether this extension is available'''
return extensions.hasGLExtension( EXTENSION_NAME )
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