| | '''OpenGL extension SGIS.texture_lod |
| | |
| | This module customises the behaviour of the |
| | OpenGL.raw.GL.SGIS.texture_lod to provide a more |
| | Python-friendly API |
| | |
| | Overview (from the spec) |
| | |
| | This extension imposes two constraints related to the texture level of |
| | detail parameter LOD, which is represented by the Greek character lambda |
| | in the GL Specification. One constraint clamps LOD to a specified |
| | floating point range. The other limits the selection of mipmap image |
| | arrays to a subset of the arrays that would otherwise be considered. |
| | |
| | Together these constraints allow a large texture to be loaded and |
| | used initially at low resolution, and to have its resolution raised |
| | gradually as more resolution is desired or available. Image array |
| | specification is necessarily integral, rather than continuous. By |
| | providing separate, continuous clamping of the LOD parameter, it is |
| | possible to avoid "popping" artifacts when higher resolution images |
| | are provided. |
| | |
| | Note: because the shape of the mipmap array is always determined by |
| | the dimensions of the level 0 array, this array must be loaded for |
| | mipmapping to be active. If the level 0 array is specified with a |
| | null image pointer, however, no actual data transfer will take |
| | place. And a sufficiently tuned implementation might not even |
| | allocate space for a level 0 array so specified until true image |
| | data were presented. |
| | |
| | The official definition of this extension is available here: |
| | http://www.opengl.org/registry/specs/SGIS/texture_lod.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.SGIS.texture_lod import * |
| | from OpenGL.raw.GL.SGIS.texture_lod import _EXTENSION_NAME |
| |
|
| | def glInitTextureLodSGIS(): |
| | '''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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| | |
