| '''OpenGL extension OES.point_sprite |
| |
| This module customises the behaviour of the |
| OpenGL.raw.GLES1.OES.point_sprite to provide a more |
| Python-friendly API |
| |
| Overview (from the spec) |
| |
| Applications such as particle systems have tended to use OpenGL quads |
| rather than points to render their geometry, since they would like |
| to use a custom-drawn texture for each particle, rather than the |
| traditional OpenGL round antialiased points, and each fragment in |
| a point has the same texture coordinates as every other fragment. |
| |
| Unfortunately, specifying the geometry for these quads can be |
| expensive, since it quadruples the amount of geometry required, and |
| may also require the application to do extra processing to compute |
| the location of each vertex. |
| |
| The purpose of this extension is to allow such applications to use |
| points rather than quads. When GL_POINT_SPRITE_OES is enabled, |
| the state of point antialiasing is ignored. For each texture unit, |
| the app can then specify whether to replace the existing texture |
| coordinates with point sprite texture coordinates, which are |
| interpolated across the point. |
| |
| The official definition of this extension is available here: |
| http://www.opengl.org/registry/specs/OES/point_sprite.txt |
| ''' |
| from OpenGL import platform, constant, arrays |
| from OpenGL import extensions, wrapper |
| import ctypes |
| from OpenGL.raw.GLES1 import _types, _glgets |
| from OpenGL.raw.GLES1.OES.point_sprite import * |
| from OpenGL.raw.GLES1.OES.point_sprite import _EXTENSION_NAME |
|
|
| def glInitPointSpriteOES(): |
| '''Return boolean indicating whether this extension is available''' |
| from OpenGL import extensions |
| return extensions.hasGLExtension( _EXTENSION_NAME ) |
|
|
|
|
| |
