| | '''OpenGL extension NV.point_sprite |
| | |
| | This module customises the behaviour of the |
| | OpenGL.raw.GL.NV.point_sprite to provide a more |
| | Python-friendly API |
| | |
| | Overview (from the spec) |
| | |
| | Applications such as particle systems usually must 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 quite |
| | expensive, since it quadruples the amount of geometry required, and |
| | it may also require the application to do extra processing to compute |
| | the location of each vertex. |
| | |
| | The goal of this extension is to allow such apps to use points rather |
| | than quads. When GL_POINT_SPRITE_NV 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. Finally, the app can set a global parameter for the way to |
| | generate the R coordinate for point sprites; the R coordinate can |
| | either be zero, the input S coordinate, or the input R coordinate. |
| | This allows applications to use a 3D texture to represent a point |
| | sprite that goes through an animation, with filtering between frames, |
| | for example. |
| | |
| | The official definition of this extension is available here: |
| | http://www.opengl.org/registry/specs/NV/point_sprite.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.NV.point_sprite import * |
| | from OpenGL.raw.GL.NV.point_sprite import _EXTENSION_NAME |
| |
|
| | def glInitPointSpriteNV(): |
| | '''Return boolean indicating whether this extension is available''' |
| | from OpenGL import extensions |
| | return extensions.hasGLExtension( _EXTENSION_NAME ) |
| |
|
| | |
| | glPointParameterivNV=wrapper.wrapper(glPointParameterivNV).setInputArraySize( |
| | 'params', None |
| | ) |
| | |
