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VideoCommon: remove unnecessary floor()

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floatindex is clamped to the range [0, 9]. For non-negative numbers
floor() is equivalent to trunc(). Truncation happens implicitly when
converting to uint, so the floor() is unnecessary.
This commit is contained in:
Tillmann Karras 2018-09-19 04:30:31 +01:00
commit 56fdcf5f00
3 changed files with 3 additions and 3 deletions
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2
Source/Core/VideoCommon/PixelShaderGen.cpp
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@ -1354,7 +1354,7 @@ static void WriteFog(ShaderCode& out, const pixel_shader_uid_data* uid_data)
out.SetConstantsUsed(C_FOGF, C_FOGF);
out.Write("\tfloat offset = (2.0 * (rawpos.x / " I_FOGF ".w)) - 1.0 - " I_FOGF ".z;\n");
out.Write("\tfloat floatindex = clamp(9.0 - abs(offset) * 9.0, 0.0, 9.0);\n");
out.Write("\tuint indexlower = uint(floor(floatindex));\n");
out.Write("\tuint indexlower = uint(floatindex);\n");
out.Write("\tuint indexupper = indexlower + 1u;\n");
out.Write("\tfloat klower = " I_FOGRANGE "[indexlower >> 2u][indexlower & 3u];\n");
out.Write("\tfloat kupper = " I_FOGRANGE "[indexupper >> 2u][indexupper & 3u];\n");