| | '''OpenGL extension SGIX.texture_scale_bias |
| | |
| | This module customises the behaviour of the |
| | OpenGL.raw.GL.SGIX.texture_scale_bias to provide a more |
| | Python-friendly API |
| | |
| | Overview (from the spec) |
| | |
| | This extension adds scale, bias, and clamp to [0, 1] operations to the |
| | texture pipeline. |
| | These operations are applied to the filtered result of a texture lookup, |
| | before that result is used in the texture environment equations and |
| | before the texture color lookup table of SGI_texture_color_table, |
| | if that extension exists. |
| | These operations are distinct from the scale, bias, and clamp operations |
| | that appear in the SGI_color_table extension, which are used to |
| | define a color lookup table. |
| | |
| | Scale and bias operations on texels can be used to better utilize the |
| | color resolution of a particular texture internal format (see EXT_texture). |
| | |
| | The official definition of this extension is available here: |
| | http://www.opengl.org/registry/specs/SGIX/texture_scale_bias.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.SGIX.texture_scale_bias import * |
| | from OpenGL.raw.GL.SGIX.texture_scale_bias import _EXTENSION_NAME |
| |
|
| | def glInitTextureScaleBiasSGIX(): |
| | '''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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| | |
