OpenGL. GL. ARB. texture_env_combine

OpenGL extension ARB.texture_env_combine

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

Overview (from the spec)

New texture environment function COMBINE_ARB allows programmable texture combiner operations, including:

REPLACE Arg0 MODULATE Arg0 * Arg1 ADD Arg0 + Arg1 ADD_SIGNED_ARB Arg0 + Arg1 - 0.5 SUBTRACT_ARB Arg0 - Arg1 INTERPOLATE_ARB Arg0 * (Arg2) + Arg1 * (1-Arg2)

where Arg0, Arg1 and Arg2 are derived from

PRIMARY_COLOR_ARB primary color of incoming fragment TEXTURE texture color of corresponding texture unit CONSTANT_ARB texture environment constant color PREVIOUS_ARB result of previous texture environment; on texture unit 0, this maps to PRIMARY_COLOR_ARB

In addition, the result may be scaled by 1.0, 2.0 or 4.0.

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