OpenGL.GL.NV.texture_env_combine4

OpenGL extension NV.texture_env_combine4

This module customises the behaviour of the OpenGL.raw.GL.NV.texture_env_combine4 to provide a more Python-friendly API

Overview (from the spec)

New texture environment function COMBINE4_NV allows programmable texture combiner operations, including

ADD Arg0 * Arg1 + Arg2 * Arg3 ADD_SIGNED_EXT Arg0 * Arg1 + Arg2 * Arg3 - 0.5

where Arg0, Arg1, Arg2 and Arg3 are derived from

ZERO the value 0 PRIMARY_COLOR_EXT primary color of incoming fragment TEXTURE texture color of corresponding texture unit CONSTANT_EXT texture environment constant color PREVIOUS_EXT result of previous texture environment; on texture unit 0, this maps to PRIMARY_COLOR_EXT TEXTURE<n>_ARB texture color of the <n>th texture unit

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/NV/texture_env_combine4.txt