| | '''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 ) |
| |
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| |
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| | |
