I wonder if it is possible to do additive blending with GL_ARB_MULTITEXTURE extension.
I would like to make something similar to using GL_SRC_ALPHA or GL_SRC_ALPHA blending functions for example.
It seems that ARB_Multitexture only allow to make a product of the textures (like GL_SRC_COLOR or GL_DST_COLOR)
thx for any help
cheers.