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NEVERMIND: interpolated colors dont discard down to 5 bit

This commit is contained in:
Jaklyy 2024-05-29 13:50:16 -04:00
parent 0d11ead1b2
commit 6b2b81bd89
1 changed files with 10 additions and 9 deletions
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19
src/GPU3D_Soft.cpp
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@ -259,6 +259,7 @@ void SoftRenderer::TextureLookup(const GPU& gpu, u32 texparam, u32 texpal, s16 s
// NOTE: compressed textures have a bug where the wont add +1 to their texture color when increasing bit depth
// This only happens in modes 1 and 3, but this *is* fixed by the revised rasterizer circuit
// ...except they forgot to fix it for the interpolated colors so uh... partial credit
// Interpolated colors are unique in being 6 bit colors; they dont discard their least significant bit.
vramaddr += ((t & 0x3FC) * (width>>2)) + (s & 0x3FC);
vramaddr += (t & 0x3);
vramaddr &= 0x7FFFF; // address used for all calcs wraps around after slot 3
@ -317,9 +318,9 @@ void SoftRenderer::TextureLookup(const GPU& gpu, u32 texparam, u32 texpal, s16 s
u32 g1 = color1 & 0x03E0;
u32 b1 = color1 & 0x7C00;
*tr = (r0 + r1) + 1 & 0x3E;
*tg = ((g0 + g1) >> 5) + 1 & 0x3E;
*tb = ((b0 + b1) >> 10) + 1 & 0x3E;
*tr = (r0 + r1);
*tg = ((g0 + g1) >> 5);
*tb = ((b0 + b1) >> 10);
}
else if ((palinfo >> 14) == 3)
{
@ -333,9 +334,9 @@ void SoftRenderer::TextureLookup(const GPU& gpu, u32 texparam, u32 texpal, s16 s
u32 g1 = color1 & 0x03E0;
u32 b1 = color1 & 0x7C00;
*tr = ((r0*5 + r1*3) >> 2) + 1 & 0x3E;
*tg = ((g0*5 + g1*3) >> 7) + 1 & 0x3E;
*tb = ((b0*5 + b1*3) >> 12) + 1 & 0x3E;
*tr = ((r0*5 + r1*3) >> 2);
*tg = ((g0*5 + g1*3) >> 7);
*tb = ((b0*5 + b1*3) >> 12);
}
else
{
@ -364,9 +365,9 @@ void SoftRenderer::TextureLookup(const GPU& gpu, u32 texparam, u32 texpal, s16 s
u32 g1 = color1 & 0x03E0;
u32 b1 = color1 & 0x7C00;
*tr = ((r0*3 + r1*5) >> 2) + 1 & 0x3E;
*tg = ((g0*3 + g1*5) >> 7) + 1 & 0x3E;
*tb = ((b0*3 + b1*5) >> 12) + 1 & 0x3E;
*tr = ((r0*3 + r1*5) >> 2);
*tg = ((g0*3 + g1*5) >> 7);
*tb = ((b0*3 + b1*5) >> 12);
*alpha = 31;
}