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* revert back to proper upscale mantissa of parameters A and C
* properly downscale magnitude to 0.24 bits instead than ≡0.23
* Z Eyespace conversion for projection by original patent concept

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@6463 8ced0084-cf51-0410-be5f-012b33b47a6e
This commit is contained in:
gnick79
2010-11-23 13:57:01 +00:00
parent b0c94a47f9
commit 4267adbd5e
4 changed files with 29 additions and 14 deletions
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20
Source/Plugins/Plugin_VideoSoftware/Src/Tev.cpp
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@ -718,18 +718,26 @@ void Tev::Draw()
if (bpmem.fog.c_proj_fsel.proj == 0)
{
// perspective
// ze = A/(B - Zs)
// ze = A/(B - (Zs >> B_SHF))
s32 denom = bpmem.fog.b_magnitude - (Position[2] >> bpmem.fog.b_shift);
ze = bpmem.fog.a.GetA() / (float)denom;
//in addition downscale magnitude and zs to 0.24 bits
ze = (bpmem.fog.a.GetA() * 16777215.0f) / (float)denom;
}
else
{
// orthographic
// ze = a*Zs
ze = bpmem.fog.a.GetA() / (float)Position[2];
//in addition downscale zs to 0.24 bits
ze = bpmem.fog.a.GetA() * ((float)Position[2] / 16777215.0f);
}
ze = (ze * (float)0xffffff) - bpmem.fog.c_proj_fsel.GetC();
// stuff to do!
// here, where we'll have to add/handle x range adjustment (if related BP register it's enabled)
// x_adjust = sqrt((x-center)^2 + k^2)/k
// ze *= x_adjust
ze -= bpmem.fog.c_proj_fsel.GetC();
// clamp 0 to 1
float fog = (ze<0.0f) ? 0.0f : ((ze>1.0f) ? 1.0f : ze);
@ -744,11 +752,11 @@ void Tev::Draw()
break;
case 6: // backward exp
fog = 1.0f - fog;
fog = 1.0f - pow(2.0f, -8.0f * fog);
fog = pow(2.0f, -8.0f * fog);
break;
case 7: // backward exp2
fog = 1.0f - fog;
fog = 1.0f - pow(2.0f, -8.0f * fog * fog);
fog = pow(2.0f, -8.0f * fog * fog);
break;
}