| '''OpenGL extension EXT.cmyka |
| |
| This module customises the behaviour of the |
| OpenGL.raw.GL.EXT.cmyka to provide a more |
| Python-friendly API |
| |
| Overview (from the spec) |
| |
| This extension provides a simple method for OpenGL to read and store |
| images whose pixels have CMYK or CMYKA formats. The algorithms used to |
| convert to RGBA from CMYKA and to convert back from RGBA to CMYKA are of |
| the "black-box" nature, meaning that the application has little control |
| over how the conversion is done. Also, this black-box mechanism is |
| available only for transfers to or from memory, not for internal copies |
| of pixel data (such as invoked by CopyPixels, CopyTexImage1D, etc.) |
| However, the defined mechanism nicely handles 5-component CMYKA images, |
| and it is very easy to use. |
| |
| A more configurable and potentially higher quality color conversion can |
| be implemented using the color tables, the color matrix, and possibly 3D |
| and 4D texture lookup. Such a color conversion also applies to copied |
| pixel data. |
| |
| The official definition of this extension is available here: |
| http://www.opengl.org/registry/specs/EXT/cmyka.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.cmyka import * |
| from OpenGL.raw.GL.EXT.cmyka import _EXTENSION_NAME |
|
|
| def glInitCmykaEXT(): |
| '''Return boolean indicating whether this extension is available''' |
| from OpenGL import extensions |
| return extensions.hasGLExtension( _EXTENSION_NAME ) |
|
|
|
|
| |
| from OpenGL import images as _i |
|
|
| _i.COMPONENT_COUNTS[ GL_CMYK_EXT ] = 4 |
| _i.COMPONENT_COUNTS[ GL_CMYKA_EXT ] = 5 |
|
|
