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thanks for advice. It's faster but it's not enough. I tried 3 shaders - flat, 2 textures combiners (up and right borders) and 4 textures (up, right, diagonal). Mixing 4 textures and mask slows whole drawing down too much (all texture reads are non-dependent). Because rendering textured surface is not main game visual feature so i decided to put together much simpler and faster way which is not so nice 