| | '''OpenGL extension ARB.blend_func_extended |
| | |
| | This module customises the behaviour of the |
| | OpenGL.raw.GL.ARB.blend_func_extended to provide a more |
| | Python-friendly API |
| | |
| | Overview (from the spec) |
| | |
| | Traditional OpenGL includes fixed-function blending that combines source |
| | colors with the existing content of a render buffer in a variety of ways. |
| | A number of extensions have enhanced this functionality by adding further |
| | sources of blending weights and methods to combine them. However, the inputs |
| | to the fixed-function blending units are constrained to a source color (as |
| | output from fragment shading), destination color (as the current content |
| | of the frame buffer) or constants that may be used in their place. |
| | |
| | This extension adds new blending functions whereby a fragment shader may |
| | output two colors, one of which is treated as the source color, and the |
| | other used as a blending factor for either source or destination colors. |
| | Furthermore, this extension increases orthogonality by allowing the |
| | SRC_ALPHA_SATURATE function to be used as the destination weight. |
| | |
| | The official definition of this extension is available here: |
| | http://www.opengl.org/registry/specs/ARB/blend_func_extended.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.ARB.blend_func_extended import * |
| | from OpenGL.raw.GL.ARB.blend_func_extended import _EXTENSION_NAME |
| |
|
| | def glInitBlendFuncExtendedARB(): |
| | '''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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| | |
