I want a GPU feature that lets me do multiple pixel shader passes with a single vertex shader. Each pass would get blended together. The goal being composable pixel shaders.
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But then you’d want to batch tons of these mask calls into a single FBO. Figuring out where to put them on the target texture gets tricky, especially if your vector is in 3D and viewed at a glancing angle.
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Also useful for multi pass materials? Instead of redrawing the model, you’d just make another run of a new pixel stage. The benefit is that it’s not committed to the render target till all fragment passes are complete.