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[PICA] We do some more DMAing

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wheremyfoodat 2023-03-09 04:13:40 +02:00
parent 49d9705b1f
commit e6bfa3fec3
1 changed files with 18 additions and 5 deletions
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23
src/core/PICA/gpu.cpp
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@ -224,21 +224,34 @@ Vertex GPU::getImmediateModeVertex() {
return v;
}
void GPU::fireDMA(u32 dest, u32 source, u32 size) {
log("[GPU] DMA of %08X bytes from %08X to %08X\n", size, source, dest);
constexpr u32 vramStart = VirtualAddrs::VramStart;
constexpr u32 vramSize = VirtualAddrs::VramSize;
const u32 fcramStart = mem.getLinearHeapVaddr();
constexpr u32 fcramSize = VirtualAddrs::FcramTotalSize;
// Shows whether this transfer is an FCRAM->VRAM transfer that's trivially optimizable
bool cpuToVRAM = true;
if (dest - vramStart >= vramSize || size > (vramSize - (dest - vramStart))) [[unlikely]] {
Helpers::panic("GPU DMA does not target VRAM");
}
if (source - fcramStart >= fcramSize || size > (fcramSize - (dest - fcramStart))) {
Helpers::panic("GPU DMA does not have FCRAM as its source");
if (source - fcramStart >= fcramSize || size > (fcramSize - (dest - fcramStart))) [[unlikely]] {
cpuToVRAM = false;
// Helpers::panic("GPU DMA does not have FCRAM as its source");
}
// Valid, optimized FCRAM->VRAM DMA. TODO: Is VRAM->VRAM DMA allowed?
u8* fcram = mem.getFCRAM();
std::memcpy(&vram[dest - vramStart], &fcram[source - fcramStart], size);
if (cpuToVRAM) [[likely]] {
// Valid, optimized FCRAM->VRAM DMA. TODO: Is VRAM->VRAM DMA allowed?
u8* fcram = mem.getFCRAM();
std::memcpy(&vram[dest - vramStart], &fcram[source - fcramStart], size);
} else {
printf("Non-trivially optimizable GPU DMA. Falling back to byte-by-byte transfer");
for (u32 i = 0; i < size; i++) {
mem.write8(dest + i, mem.read8(source + i));
}
}
}