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MarcusMaximus

Changing Blending for color subtraction

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I'm making a water demo and cant figure out how to make the blending function to make it so when 2 pieces overlap it does color subtraction instead of color addition, any1 know how to do this?

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Assuming you're doing this in multipass using blending and your implementation supports GL_EXT_blend_subtract simply use glBlendFunc(GL_FUNC_SUBTRACT_EXT). To set it back to normal use glBlendFunc(GL_FUNC_ADD_EXT).

Enigma

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Learn to use opengl extensions for functions after opengl 1.1, there are several librarys, and examples on how to do it with win32 or SDL.

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bahhh found 2 library loaders, 1 crashed everytime i try to use it and the other gives me a link error. the 1 that gave me a link error is glew which seems to be the 1 every1 uses. Maybe i need to link the library to the project? But i cant remember how to link libraries in VC++7

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ok nevermind, figured out how to link the library but it's still crashing everytime i run it with the call to glBlendEquationEXT(). that is the function im supposed to be using right?

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