added snapshot

src/snapshot.c

@@ -0,0 +1,95 @@
+#include "snapshot.h"
+
+snapshot_t* snapshot_create(emulator_t* emu)
+{
+	snapshot_t* snap = malloc(sizeof(snapshot_t));
+
+	snap->cpu    = malloc(sizeof(cpu6502_t));
+	snap->ppu    = malloc(sizeof(ppu_t));
+	snap->apu    = malloc(sizeof(apu_t));
+	snap->bus    = malloc(sizeof(bus_t));
+	snap->mapper = malloc(sizeof(mapper_t));
+
+	snapshot_update(snap, emu);
+
+	return snap;
+}
+
+void snapshot_update(snapshot_t* snap, emulator_t* emu)
+{
+	memcpy(snap->cpu, emu->cpu, sizeof(cpu6502_t));
+	memcpy(snap->ppu, emu->ppu, sizeof(ppu_t));
+	memcpy(snap->apu, emu->apu, sizeof(apu_t));
+	memcpy(snap->bus, emu->bus, sizeof(bus_t));
+	memcpy(snap->mapper, emu->bus->mapper, sizeof(mapper_t));
+
+	// Update bus addresses.
+	snap->cpu->bus = snap->bus;
+	snap->ppu->bus = snap->bus;
+	snap->apu->bus = snap->bus;
+
+	// Update bus.
+	bus_set_cpu(snap->bus, snap->cpu);
+	bus_set_ppu(snap->bus, snap->ppu);
+	bus_set_apu(snap->bus, snap->apu);
+
+	// Update mapper.
+	uint8_t chr_banks = snap->mapper->chr_banks;
+	uint8_t prg_banks = snap->mapper->prg_banks;
+	uint8_t ram_size = snap->mapper->ram_size;
+
+	snap->chr_rom = malloc(0x2000 * chr_banks);
+	snap->prg_rom = malloc(0x4000 * prg_banks);
+	snap->prg_ram = malloc(ram_size);
+
+	memcpy(snap->chr_rom, emu->mapper->chr_rom, 0x2000 * chr_banks);
+	memcpy(snap->prg_rom, emu->mapper->prg_rom, 0x2000 * prg_banks);
+	memcpy(snap->prg_ram, emu->mapper->prg_ram, ram_size);
+
+	// Update joypad, otherwise keys get stuck.
+	snap->bus->joy1.status = 0;
+	snap->bus->joy2.status = 0;
+}
+
+void snapshot_destroy(snapshot_t* snap)
+{
+	free(snap->cpu);
+	free(snap->ppu);
+	free(snap->apu);
+	free(snap->bus);
+	free(snap->mapper);
+	free(snap->chr_rom);
+	free(snap->prg_rom);
+	free(snap->prg_ram);
+	free(snap);
+}
+
+void snapshot_restore(snapshot_t* snap, emulator_t* emu)
+{
+	memcpy(emu->cpu, snap->cpu, sizeof(cpu6502_t));
+	memcpy(emu->ppu, snap->ppu, sizeof(ppu_t));
+	memcpy(emu->apu, snap->apu, sizeof(apu_t));
+	memcpy(emu->bus, snap->bus, sizeof(bus_t));
+	memcpy(emu->bus->mapper, snap->mapper, sizeof(mapper_t));
+
+	// Update bus addresses.
+	emu->cpu->bus = emu->bus;
+	emu->ppu->bus = emu->bus;
+	emu->apu->bus = emu->bus;
+
+	// Update bus internals.
+	bus_set_cpu(emu->bus, emu->cpu);
+	bus_set_ppu(emu->bus, emu->ppu);
+	bus_set_apu(emu->bus, emu->apu);
+
+	// Update mapper.
+	uint8_t chr_banks = snap->mapper->chr_banks;
+	uint8_t prg_banks = snap->mapper->prg_banks;
+	uint8_t ram_size = snap->mapper->ram_size;
+
+	memcpy(emu->bus->mapper->chr_rom, snap->chr_rom, 0x2000 * chr_banks);
+	memcpy(emu->bus->mapper->prg_rom, snap->prg_rom, 0x2000 * prg_banks);
+	memcpy(emu->bus->mapper->prg_ram, snap->prg_ram, ram_size);
+
+	SDL_RenderClear(emu->gfx->renderer);
+}

src/snapshot.h

@@ -0,0 +1,27 @@
+#ifndef NES_TOOLS_SNAPSHOT_H
+#define NES_TOOLS_SNAPSHOT_H
+
+#include "system.h"
+#include "emulator.h"
+
+typedef struct
+{
+	cpu6502_t* cpu;
+	ppu_t*     ppu;
+	apu_t*     apu;
+	bus_t*     bus;
+
+	mapper_t*  mapper;
+
+	uint8_t* chr_rom;
+	uint8_t* prg_rom;
+	uint8_t* prg_ram;
+
+} snapshot_t;
+
+snapshot_t* snapshot_create(emulator_t* emu);
+void snapshot_update(snapshot_t* snap, emulator_t* emu);
+void snapshot_restore(snapshot_t* snap, emulator_t* emu);
+void snapshot_destroy(snapshot_t* snap);
+
+#endif // NES_TOOLS_SNAPSHOT_H