| | '''OpenGL extension EXT.cull_vertex |
| | |
| | This module customises the behaviour of the |
| | OpenGL.raw.GL.EXT.cull_vertex to provide a more |
| | Python-friendly API |
| | |
| | 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://www.opengl.org/registry/specs/EXT/cull_vertex.txt |
| | ''' |
| | from OpenGL import platform, constant, arrays |
| | from OpenGL import extensions, wrapper |
| | import ctypes |
| | from OpenGL.raw.GL import _types, _glgets |
| | from OpenGL.raw.GL.EXT.cull_vertex import * |
| | from OpenGL.raw.GL.EXT.cull_vertex import _EXTENSION_NAME |
| |
|
| | def glInitCullVertexEXT(): |
| | '''Return boolean indicating whether this extension is available''' |
| | from OpenGL import extensions |
| | return extensions.hasGLExtension( _EXTENSION_NAME ) |
| |
|
| | glCullParameterdvEXT=wrapper.wrapper(glCullParameterdvEXT).setOutput( |
| | 'params',size=(4,),orPassIn=True |
| | ) |
| | glCullParameterfvEXT=wrapper.wrapper(glCullParameterfvEXT).setOutput( |
| | 'params',size=(4,),orPassIn=True |
| | ) |
| | |
