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PixelShaderGen: Add a note about a random idea which should be checked with hardware tests.

This commit is contained in:
Tony Wasserka 2014-02-28 20:53:31 +01:00
parent 6fcbda6752
commit e2e1c5c905
1 changed files with 2 additions and 0 deletions
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2
Source/Core/VideoCommon/PixelShaderGen.cpp
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@ -988,6 +988,8 @@ static inline void WriteFog(T& out, pixel_shader_uid_data& uid_data)
// perspective // perspective
// ze = A/(B - (Zs >> B_SHF) // ze = A/(B - (Zs >> B_SHF)
// TODO: Verify that we want to drop lower bits here! (currently taken over from software renderer) // TODO: Verify that we want to drop lower bits here! (currently taken over from software renderer)
// Maybe we want to use "ze = (A << B_SHF)/((B << B_SHF) - Zs)" instead?
// That's equivalent, but keeps the lower bits of Zs.
out.Write("\tfloat ze = (" I_FOGF"[1].x * 16777215.0) / float(" I_FOGI"[0].y - (zCoord >> " I_FOGI"[0].w));\n"); out.Write("\tfloat ze = (" I_FOGF"[1].x * 16777215.0) / float(" I_FOGI"[0].y - (zCoord >> " I_FOGI"[0].w));\n");
} }
else else