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added SDL

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This commit is contained in:
Lauchmelder 2021-10-23 20:36:38 +02:00
parent 7c0957325f
commit 2b71e3e0d2
8 changed files with 85 additions and 22 deletions
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26
NES Emulator/bus.c
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@ -42,7 +42,7 @@ struct Bus* createBus()
// Create PPU and attack it
bus->ppu = createPPU(bus);
printf("Reset vector: $%x\n", ((Word)readCartridge(bus->cartridge, 0xFFFD) << 8) | (readCartridge(bus->cartridge, 0xFFFC)));
bus->masterClockTimer = 0;
return bus;
}
@ -115,10 +115,26 @@ void writeBus(struct Bus* bus, Word addr, Byte val)
}
void tick(struct Bus* bus)
int tick(struct Bus* bus)
{
for (int i = 0; i < 3; i++)
tickPPU(bus->ppu);
bus->masterClockTimer++;
tickCPU(bus->cpu);
tickPPU(bus->ppu);
if (bus->masterClockTimer == 3)
{
tickCPU(bus->cpu);
bus->masterClockTimer = 0;
}
}
int doInstruction(struct Bus* bus)
{
while(bus->cpu->remainingCycles > 0)
tick(bus);
tick(bus);
}
int doFrame(struct Bus* bus)
{
do tick(bus); while (bus->ppu->x != 0 || bus->ppu->y != 0);
}