Axel Davy
95f25bef54
Boolean and Integer constants are used in d3d9 for flow control. Boolean are used for if/then/else and Integer constants for loops. The compilers can generate better code if these values are known at compilation. I haven't met so far a game that would change the values of these constants frequently (and when they do, they set to the values used for the previous draw call, and thus the changes get filtered out). Thus it makes sense to inline these constants and recompile the shaders. The commit sets a bound to the number of variants for a given shader to avoid too many shaders to be generated. One drawback is it means more shader compilations. It would probably make sense to compile these shaders asynchronously or let the user control the behaviour with an env var, but this is not done here. The games I tested hit very few shader variants, and the performance impact was negligible, but it could help for games with uber shaders. Signed-off-by: Axel Davy <davyaxel0@gmail.com>
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