OrdinaryMagician/vkdoom_m
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Switch to the lower precision rsqrtss instruction as it is faster, especially on older Intel architectures and on AMD

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Magnus Norddahl 2016-12-22 21:21:57 +01:00
commit 9a529192b0
4 changed files with 17 additions and 2 deletions
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tools/drawergen/fixedfunction/drawspancodegen.cpp
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@ -256,7 +256,7 @@ SSAVec4i DrawSpanCodegen::Shade(SSAVec4i fg, bool isSimpleShade)
// attenuation = 1 - MIN(dist * (1/radius), 1)
SSAFloat Lyz2 = light_y; // L.y*L.y + L.z*L.z
SSAFloat Lx = light_x - viewpos_x;
SSAFloat dist = SSAFloat::sqrt(Lyz2 + Lx * Lx);
SSAFloat dist = SSAFloat::fastsqrt(Lyz2 + Lx * Lx);
SSAInt attenuation = SSAInt(SSAFloat(256.0f) - SSAFloat::MIN(dist * light_rcp_radius, SSAFloat(256.0f)), true);
SSAVec4i contribution = (light_color * fg * attenuation) >> 16;