Very large texture fills, textures filling 70+% of the screen, take a huge performance hit on Blitz. A full screen textured sprite will scale according to screen but be quite a slowdown, which on older cards could be a killer. The alternative is to randomly 2D draw grain particles on the backbuffer. You'd only need to draw to some 5% or the screen which should be a lot faster. If you want every pixel to have a variation, like a random alpha on a black texture, the sprite method might well be no slower than full-screen per pixel processing.
Film Grain
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