OpenGL.GL.SGIS.texture_select

OpenGL extension SGIS.texture_select

This module customises the behaviour of the OpenGL.raw.GL.SGIS.texture_select to provide a more Python-friendly API

Overview (from the spec)

This extension introduces several new texture internal formats. The purpose of these new formats is to reorganize the components of a texture into groups of components. The currently selected group effectively becomes the internal format.

Also, two new texture parameters are introduced that control the selection of these groups of components.

For example, assume a texture internal format of DUAL_LUMINANCE4_SGIS is specified. Now there are two groups of components, where each group has a format of LUMINANCE4. One of the two LUMINANCE groups is always selected. components can be selected and then interpreted as a LUMINANCE texture.

The purpose of this extension is allow better utilization of texture memory by subdividing the internal representation of a texel into 1, 2, or 4 smaller texels. Additionally, this may improve performance of texture downloads.

The official definition of this extension is available here: http://www.opengl.org/registry/specs/SGIS/texture_select.txt