| '''OpenGL extension EXT.blend_subtract |
| |
| This module customises the behaviour of the |
| OpenGL.raw.GL.EXT.blend_subtract to provide a more |
| Python-friendly API |
| |
| Overview (from the spec) |
| |
| Two additional blending equations are specified using the interface |
| defined by EXT_blend_minmax. These equations are similar to the |
| default blending equation, but produce the difference of its left |
| and right hand sides, rather than the sum. Image differences are |
| useful in many image processing applications. |
| |
| The official definition of this extension is available here: |
| http://www.opengl.org/registry/specs/EXT/blend_subtract.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.blend_subtract import * |
| from OpenGL.raw.GL.EXT.blend_subtract import _EXTENSION_NAME |
|
|
| def glInitBlendSubtractEXT(): |
| '''Return boolean indicating whether this extension is available''' |
| from OpenGL import extensions |
| return extensions.hasGLExtension( _EXTENSION_NAME ) |
|
|
|
|
| |
