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Remove black parts in images

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Hey, i have a basic question.

I have the task to use additive blending to add 2 textures. the problem is that the texture is not just transparent and colored. its black and colored. so how do i proceed? because the task says just to use "additive" blending i tried it without hlsl. but i didnt got a good result. if i use hlsl clip to remove the black parts its just one line and it works perfect.

is it even possible to solve this problem just with a blend_desc or do i have to use hlsl?

its a little bit of a crosspost http://www.gamedev.net/topic/634813-additive-blending/ but now i have this basic question: is it even possible without hlsl?

regards helgon Edited by ~Helgon

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