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