Photoshop blending mode to OpenGL ES without shaders

Question

I need to imitate Photoshop blending modes (\"multiply\", \"screen\" etc.) in my OpenGL ES 1.1 code (without shaders).

There are some docs on how to

Answer 1

Your best place to start is to pick up a copy of the Red Book and read through the chapters on on materials and blending modes. It has a very comprehensive and clear explanation of how the 'classic' OpenGL blending functions work.