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Latte: Special case memcpy-style texture copies

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Seen in Lego games, where GX2CopySurface is used to transfer non-texture data
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Exzap committed 2026-10-31 22:35:15 +01:00
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commit 182b0bc799
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src/Cafe/HW/Latte/Core/LatteSurfaceCopy.cpp
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@@ -43,6 +43,25 @@ void LatteSurfaceCopy_copySurfaceNew(const LatteSurfaceCopyParam& src, const Lat
cemu_assert_debug((rect.x + rect.width) <= dst.pitch * (Latte::IsCompressedFormat(dst.surfaceFormat)?4:1));
cemu_assert_debug((rect.x + rect.width) <= src.pitch * (Latte::IsCompressedFormat(src.surfaceFormat)?4:1));
// Lego games use GX2CopySurface for memcpy-style transfers in the graphics queue. Transferring not only texture data, but also vertex and index data this way
// here we try to detect raw transfers as a special case and force a RAM copy. Check every parameter to avoid catching regular texture transfers, although a small risk still exists since we can't really distinguish these from actual textures
// this is not a great solution, but unless we have a more generic approach it will suffice (maybe use invalidation flags as a clue?)
const bool isRawMemoryCopy =
rect.x == 0 && rect.y == 0 && rect.width == 64 &&
rect.height >= 32 && rect.height <= 1024 && (rect.height & (rect.height - 1)) == 0 && // height controls the transfer size
src.surfaceFormat == Latte::E_GX2SURFFMT::R8_G8_B8_A8_UNORM && dst.surfaceFormat == src.surfaceFormat &&
src.pitch == 64 && dst.pitch == 64 && src.heightInTexels == rect.height && dst.heightInTexels == rect.height &&
src.tilemode == Latte::E_GX2TILEMODE::TM_2D_TILED_THIN1 && dst.tilemode == src.tilemode &&
src.dim == Latte::E_DIM::DIM_2D && dst.dim == Latte::E_DIM::DIM_2D &&
src.sliceIndex == 0 && dst.sliceIndex == 0 && src.aa == 0 && dst.aa == 0 &&
src.swizzle == 0x000D0000 && dst.swizzle == src.swizzle &&
(src.physDataAddr & 0x7FF) == 0 && (dst.physDataAddr & 0x7FF) == 0;
if (isRawMemoryCopy)
{
LatteSurfaceCopy_CopyInRAM(src, dst, rect);
return;
}
if (src.tilemode == Latte::E_GX2TILEMODE::TM_LINEAR_SPECIAL)
{
// todo - it's technically possible for a matching linear texture to be in the texture cache already