| '''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 |
| ) |
| |
