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GS: Add special case CSM2 read for Breath of Fire Dragon Quarter

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This commit is contained in:
refractionpcsx2
2026-07-16 16:44:29 +02:00
committed by lightningterror
parent 223c2cba9a
commit 45fa6a8bb5
2 changed files with 29 additions and 1 deletions
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pcsx2/GS/GSClut.cpp
+28 -1
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@@ -385,7 +385,13 @@ void GSClut::Read32(const GIFRegTEX0& TEX0, const GIFRegTEXA& TEXA)
case PSMT4HH:
clut += (TEX0.CSA & 15) << 4;
// TODO: merge these functions
ReadCLUT_T32_I4(clut, m_buff32);
// This is for a situation with Breath of Fire Dragon Quarter where it reinterprets the buffer under CSM2 after reading as CSM1.
if (TEX0.CSM == 1 && m_write.TEX0.CSM == 0)
ReadCLUT_T32_I4_Swizzled(clut, m_buff32);
else
ReadCLUT_T32_I4(clut, m_buff32);
ExpandCLUT64_T32_I8(m_buff32, (u64*)m_buff64); // sw renderer does not need m_buff64 anymore
break;
}
@@ -632,6 +638,27 @@ __forceinline void GSClut::WriteCLUT_T16_I4_CSM1(const u16* RESTRICT src, u16* R
}
}
// These functions are only used if the CLUT is in 32bit mode and it swaps to CSM2, a very obscure setup used by Breath of Fire Dragon Quarter.
// This doesn't handle offsetting the CLUT or anything crazy, that would be a lot more work
void GSClut::ReadCLUT_T32_I4_Swizzled(const u16* RESTRICT clut, u32* RESTRICT dst)
{
// Point to the base of the palette block
GSVector4i* s = (GSVector4i*)clut;
GSVector4i* d = (GSVector4i*)dst;
GSVector4i v0 = s[0];
GSVector4i v1 = s[2];
GSVector4i v2 = s[32];
GSVector4i v3 = s[34];
GSVector4i::sw16(v0, v2, v1, v3);
d[0] = v0;
d[1] = v1;
d[2] = v2;
d[3] = v3;
}
void GSClut::ReadCLUT_T32_I8(const u16* RESTRICT clut, u32* RESTRICT dst, int offset)
{
// Okay this deserves a small explanation
pcsx2/GS/GSClut.h
+1
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@@ -78,6 +78,7 @@ class alignas(32) GSClut final : public GSAlignedClass<32>
static void WriteCLUT_T32_I4_CSM1(const u32* RESTRICT src, u16* RESTRICT clut);
static void WriteCLUT_T16_I8_CSM1(const u16* RESTRICT src, u16* RESTRICT clut);
static void WriteCLUT_T16_I4_CSM1(const u16* RESTRICT src, u16* RESTRICT clut);
static void ReadCLUT_T32_I4_Swizzled(const u16* RESTRICT clut, u32* RESTRICT dst);
static void ReadCLUT_T32_I8(const u16* RESTRICT clut, u32* RESTRICT dst, int offset);
static void ReadCLUT_T32_I4(const u16* RESTRICT clut, u32* RESTRICT dst);
//static void ReadCLUT_T32_I4(const u16* RESTRICT clut, u32* RESTRICT dst32, u64* RESTRICT dst64);