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Implement 8-bit VRAM writes

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This commit is contained in:
wheremyfoodat 2023-06-11 13:14:35 +03:00
parent f2b67a2757
commit cba1ce8fb8
3 changed files with 13 additions and 3 deletions
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2
src/core/PICA/gpu.cpp
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@ -7,6 +7,7 @@ using namespace Floats;
GPU::GPU(Memory& mem) : mem(mem), renderer(*this, regs) {
vram = new u8[vramSize];
mem.setVRAM(vram); // Give the bus a pointer to our VRAM
}
void GPU::reset() {
@ -256,7 +257,6 @@ void GPU::fireDMA(u32 dest, u32 source, u32 size) {
std::memcpy(&vram[dest - vramStart], &fcram[source - fcramStart], size);
} else {
printf("Non-trivially optimizable GPU DMA. Falling back to byte-by-byte transfer");
std::memcpy(&vram[dest - vramStart], mem.getReadPointer(source), size);
for (u32 i = 0; i < size; i++) {
mem.write8(dest + i, mem.read8(source + i));

10
src/core/memory.cpp
View file

@ -143,7 +143,15 @@ void Memory::write8(u32 vaddr, u8 value) {
*(u8*)(pointer + offset) = value;
}
else {
Helpers::panic("Unimplemented 8-bit write, addr: %08X, val: %02X", vaddr, value);
// VRAM write
if (vaddr >= VirtualAddrs::VramStart && vaddr < VirtualAddrs::VramStart + VirtualAddrs::VramSize) {
// TODO: Invalidate renderer caches here
vram[vaddr - VirtualAddrs::VramStart] = value;
}
else {
Helpers::panic("Unimplemented 8-bit write, addr: %08X, val: %02X", vaddr, value);
}
}
}