| '''OpenGL extension OES.blend_subtract |
| |
| This module customises the behaviour of the |
| OpenGL.raw.GLES1.OES.blend_subtract to provide a more |
| Python-friendly API |
| |
| Overview (from the spec) |
| |
| Blending capability is extended by respecifying the entire blend |
| equation. While this document defines only two new equations, the |
| BlendEquationOES procedure that it defines will be used by subsequent |
| extensions to define additional blending equations. |
| |
| In addition to the default blending equation, two new blending equations |
| are specified. 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/OES/blend_subtract.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.blend_subtract import * |
| from OpenGL.raw.GLES1.OES.blend_subtract import _EXTENSION_NAME |
|
|
| def glInitBlendSubtractOES(): |
| '''Return boolean indicating whether this extension is available''' |
| from OpenGL import extensions |
| return extensions.hasGLExtension( _EXTENSION_NAME ) |
|
|
|
|
| |
