2D Texgen

Both S & T coordinates can use texgen, to apply 2D textures with automatic coordinates.

This is done by making similar glTexGen calls for the T coordinate (but using a different plane).

SplaneCoefficients = [ 1, 0, 0, 0 ]
glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR)
glTexGenfv(GL_S, GL_EYE_PLANE, SplaneCoefficients)
glTexGenfv(GL_S, GL_OBJECT_PLANE, SplaneCoefficients)

TplaneCoefficients = [ 0, 1, 0, 0 ]
glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR)
glTexGenfv(GL_T, GL_EYE_PLANE, TplaneCoefficients)
glTexGenfv(GL_T, GL_OBJECT_PLANE, TplaneCoefficients)

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