| '''OpenGL extension MESA.pack_invert |
| |
| This module customises the behaviour of the |
| OpenGL.raw.GL.MESA.pack_invert to provide a more |
| Python-friendly API |
| |
| Overview (from the spec) |
| |
| This extension adds a new pixel storage parameter to indicate that |
| images are to be packed in top-to-bottom order instead of OpenGL's |
| conventional bottom-to-top order. Only pixel packing can be |
| inverted (i.e. for glReadPixels, glGetTexImage, glGetConvolutionFilter, |
| etc). |
| |
| Almost all known image file formats store images in top-to-bottom |
| order. As it is, OpenGL reads images from the frame buffer in |
| bottom-to-top order. Thus, images usually have to be inverted before |
| writing them to a file with image I/O libraries. This extension |
| allows images to be read such that inverting isn't needed. |
| |
| The official definition of this extension is available here: |
| http://www.opengl.org/registry/specs/MESA/pack_invert.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.MESA.pack_invert import * |
| from OpenGL.raw.GL.MESA.pack_invert import _EXTENSION_NAME |
|
|
| def glInitPackInvertMESA(): |
| '''Return boolean indicating whether this extension is available''' |
| from OpenGL import extensions |
| return extensions.hasGLExtension( _EXTENSION_NAME ) |
|
|
|
|
| |
