ref: 51780f3db8ae3780adec661665d5445116ef07f9
dir: /zelda_cpu_infra.c/
// This file handles running zelda through the emulated cpu.
#include "zelda_cpu_infra.h"
#include "zelda_rtl.h"
#include "variables.h"
#include "misc.h"
#include "nmi.h"
#include "poly.h"
#include "attract.h"
#include "spc_player.h"
#include "snes/snes_regs.h"
#include "snes/snes.h"
#include "snes/cpu.h"
#include "snes/cart.h"
#include "tracing.h"
Snes *g_snes;
Cpu *g_cpu;
uint8 g_emulated_ram[0x20000];
void SaveLoadSlot(int cmd, int which);
uint8 *GetPtr(uint32 addr) {
Cart *cart = g_snes->cart;
return &cart->rom[(((addr >> 16) << 15) | (addr & 0x7fff)) & (cart->romSize - 1)];
}
uint8 *GetCartRamPtr(uint32 addr) {
Cart *cart = g_snes->cart;
return &cart->ram[addr];
}
typedef struct Snapshot {
uint16 a, x, y, sp, dp, pc;
uint8 k, db, flags;
uint8 ram[0x20000];
uint16 vram[0x8000];
uint16 sram[0x2000];
} Snapshot;
static Snapshot g_snapshot_mine, g_snapshot_theirs, g_snapshot_before;
static void MakeSnapshot(Snapshot *s) {
Cpu *c = g_cpu;
s->a = c->a, s->x = c->x, s->y = c->y;
s->sp = c->sp, s->dp = c->dp, s->db = c->db;
s->pc = c->pc, s->k = c->k;
s->flags = cpu_getFlags(c);
memcpy(s->ram, g_snes->ram, 0x20000);
memcpy(s->sram, g_snes->cart->ram, g_snes->cart->ramSize);
memcpy(s->vram, g_snes->ppu->vram, sizeof(uint16) * 0x8000);
}
static void MakeMySnapshot(Snapshot *s) {
memcpy(s->ram, g_zenv.ram, 0x20000);
memcpy(s->sram, g_zenv.sram, 0x2000);
memcpy(s->vram, g_zenv.ppu->vram, sizeof(uint16) * 0x8000);
}
static void RestoreMySnapshot(Snapshot *s) {
memcpy(g_zenv.ram, s->ram, 0x20000);
memcpy(g_zenv.sram, s->sram, 0x2000);
memcpy(g_zenv.ppu->vram, s->vram, sizeof(uint16) * 0x8000);
}
static void RestoreSnapshot(Snapshot *s) {
Cpu *c = g_cpu;
c->a = s->a, c->x = s->x, c->y = s->y;
c->sp = s->sp, c->dp = s->dp, c->db = s->db;
c->pc = s->pc, c->k = s->k;
cpu_setFlags(c, s->flags);
memcpy(g_snes->ram, s->ram, 0x20000);
memcpy(g_snes->cart->ram, s->sram, g_snes->cart->ramSize);
memcpy(g_snes->ppu->vram, s->vram, sizeof(uint16) * 0x8000);
}
static bool g_fail;
static void VerifySnapshotsEq(Snapshot *b, Snapshot *a, Snapshot *prev) {
memcpy(b->ram, a->ram, 16);
b->ram[0xfa1] = a->ram[0xfa1];
b->ram[0x72] = a->ram[0x72];
b->ram[0x73] = a->ram[0x73];
b->ram[0x74] = a->ram[0x74];
b->ram[0x75] = a->ram[0x75];
b->ram[0xb7] = a->ram[0xb7];
b->ram[0xb8] = a->ram[0xb8];
b->ram[0xb9] = a->ram[0xb9];
b->ram[0xba] = a->ram[0xba];
b->ram[0xbb] = a->ram[0xbb];
b->ram[0xbd] = a->ram[0xbd];
b->ram[0xbe] = a->ram[0xbe];
b->ram[0xc8] = a->ram[0xc8];
b->ram[0xc9] = a->ram[0xc9];
b->ram[0xca] = a->ram[0xca];
b->ram[0xcb] = a->ram[0xcb];
b->ram[0xcc] = a->ram[0xcc];
b->ram[0xcd] = a->ram[0xcd];
b->ram[0xa0] = a->ram[0xa0];
b->ram[0x128] = a->ram[0x128]; // irq_flag
b->ram[0x463] = a->ram[0x463]; // which_staircase_index_padding
// c code is authoritative
WORD(a->ram[0x1f0a]) = WORD(b->ram[0x1f0a]);
memcpy(&b->ram[0x1f0d], &a->ram[0x1f0d], 0x3f - 0xd);
memcpy(b->ram + 0x138, a->ram + 0x138, 256 - 0x38); // copy the stack over
if (memcmp(b->ram, a->ram, 0x20000)) {
fprintf(stderr, "@%d: Memory compare failed (mine != theirs, prev):\n", frame_counter);
int j = 0;
for (size_t i = 0; i < 0x20000; i++) {
if (a->ram[i] != b->ram[i]) {
if (++j < 128) {
if ((i&1) == 0 && a->ram[i + 1] != b->ram[i + 1]) {
fprintf(stderr, "0x%.6X: %.4X != %.4X (%.4X)\n", (int)i,
WORD(b->ram[i]), WORD(a->ram[i]), WORD(prev->ram[i]));
i++, j++;
} else {
fprintf(stderr, "0x%.6X: %.2X != %.2X (%.2X)\n", (int)i, b->ram[i], a->ram[i], prev->ram[i]);
}
}
}
}
if (j)
g_fail = true;
fprintf(stderr, " total of %d failed bytes\n", (int)j);
}
if (memcmp(b->sram, a->sram, 0x2000)) {
fprintf(stderr, "@%d: SRAM compare failed (mine != theirs, prev):\n", frame_counter);
int j = 0;
for (size_t i = 0; i < 0x2000; i++) {
if (a->sram[i] != b->sram[i]) {
if (++j < 128) {
if ((i&1) == 0 && a->sram[i + 1] != b->sram[i + 1]) {
fprintf(stderr, "0x%.6X: %.4X != %.4X (%.4X)\n", (int)i,
WORD(b->sram[i]), WORD(a->sram[i]), WORD(prev->sram[i]));
i++, j++;
} else {
fprintf(stderr, "0x%.6X: %.2X != %.2X (%.2X)\n", (int)i, b->sram[i], a->sram[i], prev->sram[i]);
}
}
}
}
if (j)
g_fail = true;
fprintf(stderr, " total of %d failed bytes\n", (int)j);
}
if (memcmp(b->vram, a->vram, sizeof(uint16) * 0x8000)) {
fprintf(stderr, "@%d: VRAM compare failed (mine != theirs, prev):\n", frame_counter);
for (size_t i = 0, j = 0; i < 0x8000; i++) {
if (a->vram[i] != b->vram[i]) {
fprintf(stderr, "0x%.6X: %.4X != %.4X (%.4X)\n", (int)i, b->vram[i], a->vram[i], prev->vram[i]);
g_fail = true;
if (++j >= 16)
break;
}
}
}
}
static uint8_t *RomByte(Cart *cart, uint32_t addr) {
return &cart->rom[(((addr >> 16) << 15) | (addr & 0x7fff)) & (cart->romSize - 1)];
}
void SetSnes(Snes *snes) {
g_snes = snes;
g_cpu = snes->cpu;
}
bool g_calling_asm_from_c;
void HookedFunctionRts(int is_long) {
if (g_calling_asm_from_c) {
g_calling_asm_from_c = false;
return;
}
assert(0);
}
void RunEmulatedFunc(uint32 pc, uint16 a, uint16 x, uint16 y, bool mf, bool xf, int b, int whatflags) {
g_snes->debug_cycles = 1;
RunEmulatedFuncSilent(pc, a, x, y, mf, xf, b, whatflags | 2);
g_snes->debug_cycles = 0;
}
void RunEmulatedFuncSilent(uint32 pc, uint16 a, uint16 x, uint16 y, bool mf, bool xf, int b, int whatflags) {
uint16 org_sp = g_cpu->sp;
uint16 org_pc = g_cpu->pc;
uint8 org_b = g_cpu->db;
uint8 org_dp = g_cpu->dp;
if (b != -1)
g_cpu->db = b >= 0 ? b : pc >> 16;
if (b == -3)
g_cpu->dp = 0x1f00;
static uint8 *rambak;
if (rambak == 0) rambak = (uint8 *)malloc(0x20000);
memcpy(rambak, g_emulated_ram, 0x20000);
memcpy(g_emulated_ram, g_ram, 0x20000);
if (whatflags & 2)
g_emulated_ram[0x1ffff] = 0x67;
g_cpu->a = a;
g_cpu->x = x;
g_cpu->y = y;
g_cpu->spBreakpoint = g_cpu->sp;
g_cpu->k = (pc >> 16);
g_cpu->pc = (pc & 0xffff);
g_cpu->mf = mf;
g_cpu->xf = xf;
g_calling_asm_from_c = true;
while (g_calling_asm_from_c) {
if (g_snes->debug_cycles) {
char line[80];
getProcessorStateCpu(g_snes, line);
puts(line);
}
cpu_runOpcode(g_cpu);
while (g_snes->dma->dmaBusy)
dma_doDma(g_snes->dma);
if (whatflags & 1) {
/* if (apu_debugging == 2 && g_snes->apu->cpuCyclesLeft == 0) {
char line[80];
getProcessorStateSpc(g_snes->apu, line);
puts(line);
}*/
// apu_cycle(g_snes->apu);
}
}
g_cpu->dp = org_dp;
g_cpu->sp = org_sp;
g_cpu->db = org_b;
g_cpu->pc = org_pc;
memcpy(g_ram, g_emulated_ram, 0x20000);
memcpy(g_emulated_ram, rambak, 0x20000);
}
void RunOrigAsmCodeOneLoop(Snes *snes) {
Cpu *cpu = snes->cpu;
cpu->a = cpu->x = cpu->y = 0;
cpu->e = false;
cpu->irqWanted = cpu->nmiWanted = cpu->waiting = cpu->stopped = 0;
cpu_setFlags(cpu, 0x30);
// Run until the wait loop in Interrupt_Reset,
// Or the polyhedral main function.
for(int loops = 0;;loops++) {
snes_printCpuLine(snes);
cpu_runOpcode(snes->cpu);
while (snes->dma->dmaBusy)
dma_doDma(snes->dma);
uint32_t pc = snes->cpu->k << 16 | snes->cpu->pc;
if (pc == 0x8034 || pc == 0x9f81d && loops >= 10 || pc == 0x8225 || pc == 0x82D2)
break;
}
}
void RunEmulatedSnesFrame(Snes *snes, int run_what) {
// First call runs until init
if (snes->cpu->pc == 0x8000 && snes->cpu->k == 0) {
RunOrigAsmCodeOneLoop(snes);
g_emulated_ram[0x12] = 1;
// Fixup uninitialized variable
*(uint16*)(g_emulated_ram+0xAE0) = 0xb280;
*(uint16*)(g_emulated_ram+0xAE2) = 0xb280 + 0x60;
}
// Run poly code
if (run_what & 2) {
Cpu *cpu = snes->cpu;
cpu->sp = 0x1f3e;
cpu->pc = 0xf81d;
cpu->db = cpu->k = 9;
cpu->dp = 0x1f00;
RunOrigAsmCodeOneLoop(snes);
}
// Run main code
if (run_what & 1) {
Cpu *cpu = g_snes->cpu;
cpu->sp = 0x1ff;
cpu->pc = 0x8034;
cpu->k = cpu->dp = cpu->db = 0;
RunOrigAsmCodeOneLoop(snes);
}
snes_doAutoJoypad(snes);
// animated_tile_vram_addr uninited
if (snes->ram[0xadd] == 0)
*(uint16_t*)&snes->ram[0xadc] = 0xa680;
// In one code path flag_update_hud_in_nmi uses an undefined value
snes_write(snes, DMAP0, 0x01);
snes_write(snes, BBAD0, 0x18);
// Run NMI handler
Cpu *cpu = g_snes->cpu;
cpu->sp = 0x1ff;
cpu->pc = 0x80D9;
cpu->k = cpu->dp = cpu->db = 0;
RunOrigAsmCodeOneLoop(snes);
}
struct Ppu *GetPpuForRendering() {
return g_zenv.ppu;
}
Dsp *GetDspForRendering() {
SpcPlayer_GenerateSamples(g_zenv.player);
return g_zenv.player->dsp;
}
typedef struct ByteArray {
uint8 *data;
size_t size, capacity;
} ByteArray;
void ByteArray_Resize(ByteArray *arr, size_t new_size) {
arr->size = new_size;
if (new_size > arr->capacity) {
size_t minsize = arr->capacity + (arr->capacity >> 1) + 8;
arr->capacity = new_size < minsize ? minsize : new_size;
void *data = realloc(arr->data, arr->capacity);
if (!data) Die("memory allocation failed");
arr->data = data;
}
}
void ByteArray_Destroy(ByteArray *arr) {
free(arr->data);
arr->data = NULL;
}
void ByteArray_AppendData(ByteArray *arr, const uint8 *data, size_t data_size) {
ByteArray_Resize(arr, arr->size + data_size);
memcpy(arr->data + arr->size - data_size, data, data_size);
}
void ByteArray_AppendByte(ByteArray *arr, uint8 v) {
ByteArray_Resize(arr, arr->size + 1);
arr->data[arr->size - 1] = v;
}
void ByteArray_AppendVl(ByteArray *arr, uint32 v) {
for (; v >= 255; v -= 255)
ByteArray_AppendByte(arr, 255);
ByteArray_AppendByte(arr, v);
}
void saveFunc(void *ctx_in, void *data, size_t data_size) {
ByteArray_AppendData((ByteArray *)ctx_in, data, data_size);
}
typedef struct LoadFuncState {
uint8 *p, *pend;
} LoadFuncState;
void loadFunc(void *ctx, void *data, size_t data_size) {
LoadFuncState *st = (LoadFuncState *)ctx;
assert(st->pend - st->p >= data_size);
memcpy(data, st->p, data_size);
st->p += data_size;
}
void CopyStateAfterSnapshotRestore(bool is_reset) {
memcpy(g_zenv.ram, g_snes->ram, 0x20000);
memcpy(g_zenv.sram, g_snes->cart->ram, g_snes->cart->ramSize);
memcpy(g_zenv.ppu->vram, &g_snes->ppu->vram, offsetof(Ppu, pixelBuffer) - offsetof(Ppu, vram));
memcpy(g_zenv.player->ram, g_snes->apu->ram, sizeof(g_snes->apu->ram));
if (!is_reset) {
memcpy(g_zenv.player->dsp->ram, g_snes->apu->dsp->ram, sizeof(Dsp) - offsetof(Dsp, ram));
SpcPlayer_CopyVariablesFromRam(g_zenv.player);
}
memcpy(g_zenv.dma->channel, g_snes->dma->channel, sizeof(Dma) - offsetof(Dma, channel));
g_zenv.player->timer_cycles = 0;
}
void SaveSnesState(ByteArray *ctx) {
MakeSnapshot(&g_snapshot_before);
// Copy from my state into the emulator
memcpy(&g_snes->ppu->vram, g_zenv.ppu->vram, offsetof(Ppu, pixelBuffer) - offsetof(Ppu, vram));
memcpy(g_snes->ram, g_zenv.ram, 0x20000);
memcpy(g_snes->cart->ram, g_zenv.sram, 0x2000);
SpcPlayer_CopyVariablesToRam(g_zenv.player);
memcpy(g_snes->apu->ram, g_zenv.player->ram, 0x10000);
memcpy(g_snes->apu->dsp->ram, g_zenv.player->dsp->ram, sizeof(Dsp) - offsetof(Dsp, ram));
memcpy(g_snes->dma->channel, g_zenv.dma->channel, sizeof(Dma) - offsetof(Dma, channel));
snes_saveload(g_snes, &saveFunc, ctx);
RestoreSnapshot(&g_snapshot_before);
}
typedef struct StateRecorder {
uint16 last_inputs;
uint32 frames_since_last;
uint32 total_frames;
// For replay
uint32 replay_pos, replay_pos_last_complete;
uint32 replay_frame_counter;
uint32 replay_next_cmd_at;
uint8 replay_cmd;
bool replay_mode;
ByteArray log;
ByteArray base_snapshot;
} StateRecorder;
static StateRecorder state_recorder;
void StateRecorder_Init(StateRecorder *sr) {
memset(sr, 0, sizeof(*sr));
}
void StateRecorder_RecordCmd(StateRecorder *sr, uint8 cmd) {
int frames = sr->frames_since_last;
sr->frames_since_last = 0;
int x = (cmd < 0xc0) ? 0xf : 0x1;
ByteArray_AppendByte(&sr->log, cmd | (frames < x ? frames : x));
if (frames >= x)
ByteArray_AppendVl(&sr->log, frames - x);
}
void StateRecorder_Record(StateRecorder *sr, uint16 inputs) {
uint16 diff = inputs ^ sr->last_inputs;
if (diff != 0) {
sr->last_inputs = inputs;
printf("0x%.4x %d: ", diff, sr->frames_since_last);
size_t lb = sr->log.size;
for (int i = 0; i < 12; i++) {
if ((diff >> i) & 1)
StateRecorder_RecordCmd(sr, i << 4);
}
while (lb < sr->log.size)
printf("%.2x ", sr->log.data[lb++]);
printf("\n");
}
sr->frames_since_last++;
sr->total_frames++;
}
void StateRecorder_RecordPatchByte(StateRecorder *sr, uint32 addr, const uint8 *value, int num) {
assert(addr < 0x20000);
printf("%d: PatchByte(0x%x, 0x%x. %d): ", sr->frames_since_last, addr, *value, num);
size_t lb = sr->log.size;
int lq = (num - 1) <= 3 ? (num - 1) : 3;
StateRecorder_RecordCmd(sr, 0xc0 | (addr & 0x10000 ? 2 : 0) | lq << 2);
if (lq == 3)
ByteArray_AppendVl(&sr->log, num - 1 - 3);
ByteArray_AppendByte(&sr->log, addr >> 8);
ByteArray_AppendByte(&sr->log, addr);
for(int i = 0; i < num; i++)
ByteArray_AppendByte(&sr->log, value[i]);
while (lb < sr->log.size)
printf("%.2x ", sr->log.data[lb++]);
printf("\n");
}
void StateRecorder_Load(StateRecorder *sr, FILE *f, bool replay_mode) {
// todo: fix robustness on invalid data.
uint32 hdr[8] = { 0 };
fread(hdr, 1, sizeof(hdr), f);
assert(hdr[0] == 1);
sr->total_frames = hdr[1];
ByteArray_Resize(&sr->log, hdr[2]);
fread(sr->log.data, 1, sr->log.size, f);
sr->last_inputs = hdr[3];
sr->frames_since_last = hdr[4];
ByteArray_Resize(&sr->base_snapshot, (hdr[5] & 1) ? hdr[6] : 0);
fread(sr->base_snapshot.data, 1, sr->base_snapshot.size, f);
sr->replay_next_cmd_at = 0;
bool is_reset = false;
sr->replay_mode = replay_mode;
if (replay_mode) {
sr->frames_since_last = 0;
sr->last_inputs = 0;
sr->replay_pos = sr->replay_pos_last_complete = 0;
sr->replay_frame_counter = 0;
// Load snapshot from |base_snapshot_|, or reset if empty.
if (sr->base_snapshot.size) {
LoadFuncState state = { sr->base_snapshot.data, sr->base_snapshot.data + sr->base_snapshot.size };
snes_saveload(g_snes, &loadFunc, &state);
assert(state.p == state.pend);
} else {
snes_reset(g_snes, true);
SpcPlayer_Initialize(g_zenv.player);
is_reset = true;
}
} else {
// Resume replay from the saved position?
sr->replay_pos = sr->replay_pos_last_complete = hdr[5] >> 1;
sr->replay_frame_counter = hdr[7];
sr->replay_mode = (sr->replay_frame_counter != 0);
ByteArray arr = { 0 };
ByteArray_Resize(&arr, hdr[6]);
fread(arr.data, 1, arr.size, f);
LoadFuncState state = { arr.data, arr.data + arr.size };
snes_saveload(g_snes, &loadFunc, &state);
ByteArray_Destroy(&arr);
assert(state.p == state.pend);
}
CopyStateAfterSnapshotRestore(is_reset);
}
void StateRecorder_Save(StateRecorder *sr, FILE *f) {
uint32 hdr[8] = { 0 };
ByteArray arr = {0};
SaveSnesState(&arr);
assert(sr->base_snapshot.size == 0 || sr->base_snapshot.size == arr.size);
hdr[0] = 1;
hdr[1] = sr->total_frames;
hdr[2] = (uint32)sr->log.size;
hdr[3] = sr->last_inputs;
hdr[4] = sr->frames_since_last;
hdr[5] = sr->base_snapshot.size ? 1 : 0;
hdr[6] = (uint32)arr.size;
// If saving while in replay mode, also need to persist
// sr->replay_pos_last_complete and sr->replay_frame_counter
// so the replaying can be resumed.
if (sr->replay_mode) {
hdr[5] |= sr->replay_pos_last_complete << 1;
hdr[7] = sr->replay_frame_counter;
}
fwrite(hdr, 1, sizeof(hdr), f);
fwrite(sr->log.data, 1, hdr[2], f);
fwrite(sr->base_snapshot.data, 1, sr->base_snapshot.size, f);
fwrite(arr.data, 1, arr.size, f);
ByteArray_Destroy(&arr);
}
void StateRecorder_ClearKeyLog(StateRecorder *sr) {
printf("Clearing key log!\n");
sr->base_snapshot.size = 0;
SaveSnesState(&sr->base_snapshot);
ByteArray old_log = sr->log;
int old_frames_since_last = sr->frames_since_last;
memset(&sr->log, 0, sizeof(sr->log));
// If there are currently any active inputs, record them initially at timestamp 0.
sr->frames_since_last = 0;
if (sr->last_inputs) {
for (int i = 0; i < 12; i++) {
if ((sr->last_inputs >> i) & 1)
StateRecorder_RecordCmd(sr, i << 4);
}
}
if (sr->replay_mode) {
// When clearing the key log while in replay mode, we want to keep
// replaying but discarding all key history up until this point.
if (sr->replay_next_cmd_at != 0xffffffff) {
sr->replay_next_cmd_at -= old_frames_since_last;
sr->frames_since_last = sr->replay_next_cmd_at;
sr->replay_pos_last_complete = (uint32)sr->log.size;
StateRecorder_RecordCmd(sr, sr->replay_cmd);
int old_replay_pos = sr->replay_pos;
sr->replay_pos = (uint32)sr->log.size;
ByteArray_AppendData(&sr->log, old_log.data + old_replay_pos, old_log.size - old_replay_pos);
}
sr->total_frames -= sr->replay_frame_counter;
sr->replay_frame_counter = 0;
} else {
sr->total_frames = 0;
}
ByteArray_Destroy(&old_log);
sr->frames_since_last = 0;
}
uint16 StateRecorder_ReadNextReplayState(StateRecorder *sr) {
assert(sr->replay_mode);
while (sr->frames_since_last >= sr->replay_next_cmd_at) {
int replay_pos = sr->replay_pos;
if (replay_pos != sr->replay_pos_last_complete) {
// Apply next command
sr->frames_since_last = 0;
if (sr->replay_cmd < 0xc0) {
sr->last_inputs ^= 1 << (sr->replay_cmd >> 4);
} else if (sr->replay_cmd < 0xd0) {
int nb = 1 + ((sr->replay_cmd >> 2) & 3);
uint8 t;
if (nb == 4) do {
nb += t = sr->log.data[replay_pos++];
} while (t == 255);
uint32 addr = ((sr->replay_cmd >> 1) & 1) << 16;
addr |= sr->log.data[replay_pos++] << 8;
addr |= sr->log.data[replay_pos++];
do {
g_emulated_ram[addr & 0x1ffff] = g_ram[addr & 0x1ffff] = sr->log.data[replay_pos++];
} while (addr++, --nb);
} else {
assert(0);
}
}
sr->replay_pos_last_complete = replay_pos;
if (replay_pos >= sr->log.size) {
sr->replay_pos = replay_pos;
sr->replay_next_cmd_at = 0xffffffff;
break;
}
// Read the next one
uint8 cmd = sr->log.data[replay_pos++], t;
int mask = (cmd < 0xc0) ? 0xf : 0x1;
int frames = cmd & mask;
if (frames == mask) do {
frames += t = sr->log.data[replay_pos++];
} while (t == 255);
sr->replay_next_cmd_at = frames;
sr->replay_cmd = cmd;
sr->replay_pos = replay_pos;
}
sr->frames_since_last++;
// Turn off replay mode after we reached the final frame position
if (++sr->replay_frame_counter >= sr->total_frames) {
sr->replay_mode = false;
}
return sr->last_inputs;
}
void StateRecorder_StopReplay(StateRecorder *sr) {
if (!sr->replay_mode)
return;
sr->replay_mode = false;
sr->total_frames = sr->replay_frame_counter;
sr->log.size = sr->replay_pos_last_complete;
}
static int frame_ctr;
int IncrementCrystalCountdown(uint8 *a, int v) {
int t = *a + v;
*a = t;
return t >> 8;
}
#ifdef _DEBUG
// This can be used to read inputs from a text file for easier debugging
int InputStateReadFromFile() {
static FILE *f;
static uint32 next_ts, next_keys, cur_keys;
char buf[64];
char keys[64];
while (state_recorder.total_frames == next_ts) {
cur_keys = next_keys;
if (!f)
f = fopen("boss_bug.txt", "r");
if (fgets(buf, sizeof(buf), f)) {
if (sscanf(buf, "%d: %s", &next_ts, keys) == 1) keys[0] = 0;
int i = 0;
for (const char *s = keys; *s; s++) {
static const char kKeys[] = "AXsSUDLRBY";
const char *t = strchr(kKeys, *s);
assert(t);
i |= 1 << (t - kKeys);
}
next_keys = i;
} else {
next_ts = 0xffffffff;
}
}
return cur_keys;
}
#endif
bool RunOneFrame(Snes *snes, int input_state, bool turbo) {
frame_ctr++;
// Either copy state or apply state
if (state_recorder.replay_mode) {
input_state = StateRecorder_ReadNextReplayState(&state_recorder);
} else {
// input_state = InputStateReadFromFile();
StateRecorder_Record(&state_recorder, input_state);
turbo = false;
// This is whether APUI00 is true or false, this is used by the ancilla code.
uint8 apui00 = g_zenv.player->port_to_snes[0] != 0;
if (apui00 != g_ram[0x648]) {
g_emulated_ram[0x648] = g_ram[0x648] = apui00;
StateRecorder_RecordPatchByte(&state_recorder, 0x648, &apui00, 1);
}
// Whenever we're no longer replaying, we'll remember what bugs were fixed,
// but only if game is initialized.
if (g_ram[kRam_BugsFixed] < kBugFix_Latest && animated_tile_data_src != 0) {
g_emulated_ram[kRam_BugsFixed] = g_ram[kRam_BugsFixed] = kBugFix_Latest;
StateRecorder_RecordPatchByte(&state_recorder, kRam_BugsFixed, &g_ram[kRam_BugsFixed], 1);
}
}
int run_what;
if (g_ram[kRam_BugsFixed] < kBugFix_PolyRenderer) {
// A previous version of this code alternated the game loop with
// the poly renderer.
run_what = (is_nmi_thread_active && thread_other_stack != 0x1f31) ? 2 : 1;
} else {
// The snes seems to let poly rendering run for a little
// while each fram until it eventually completes a frame.
// Simulate this by rendering the poly every n:th frame.
run_what = (is_nmi_thread_active && IncrementCrystalCountdown(&g_ram[kRam_CrystalRotateCounter], virq_trigger)) ? 3 : 1;
g_emulated_ram[kRam_CrystalRotateCounter] = g_ram[kRam_CrystalRotateCounter];
}
if (snes == NULL) {
ZeldaRunFrame(input_state, run_what);
return turbo;
}
MakeSnapshot(&g_snapshot_before);
MakeMySnapshot(&g_snapshot_mine);
MakeSnapshot(&g_snapshot_theirs);
// Compare both snapshots
VerifySnapshotsEq(&g_snapshot_mine, &g_snapshot_theirs, &g_snapshot_before);
if (g_fail) {
printf("early fail\n");
return turbo;
}
// Run orig version then snapshot
snes->input1->currentState = input_state;
RunEmulatedSnesFrame(snes, run_what);
MakeSnapshot(&g_snapshot_theirs);
// Run my version and snapshot
again_mine:
ZeldaRunFrame(input_state, run_what);
MakeMySnapshot(&g_snapshot_mine);
// Compare both snapshots
VerifySnapshotsEq(&g_snapshot_mine, &g_snapshot_theirs, &g_snapshot_before);
if (g_fail) {
g_fail = false;
RestoreMySnapshot(&g_snapshot_before);
// RestoreSnapshot(&g_snapshot_before);
//SaveLoadSlot(kSaveLoad_Save, 0);
goto again_mine;
}
return turbo;
}
void PatchRomBP(uint8_t *rom, uint32_t addr) {
rom[(addr >> 16) << 15 | (addr & 0x7fff)] = 0;
}
void PatchRom(uint8_t *rom) {
// fix a bug with unitialized memory
{
uint8_t *p = rom + 0x36434;
memmove(p, p + 2, 7);
p[7] = 0xb0;
p[8] = 0x40 - 7;
}
// BufferAndBuildMap16Stripes_Y can read bad memory if int is negative
if (1) {
uint8_t *p = rom + 0x10000 - 0x8000;
int thunk = 0xFF6E;
uint8_t *tp = p + thunk;
*tp++ = 0xc0; *tp++ = 0x00; *tp++ = 0x20;
*tp++ = 0x90; *tp++ = 0x03;
*tp++ = 0xa9; *tp++ = 0x00; *tp++ = 0x00;
*tp++ = 0x9d; *tp++ = 0x00; *tp++ = 0x05;
*tp++ = 0x60;
p[0xf4a7] = 0x20; p[0xf4a8] = thunk; p[0xf4a9] = thunk >> 8;
p[0xf4b5] = 0x20; p[0xf4b6] = thunk; p[0xf4b7] = thunk >> 8;
p[0xf3dd] = 0x20; p[0xf3de] = thunk; p[0xf3df] = thunk >> 8;
p[0xf3ef] = 0x20; p[0xf3f0] = thunk; p[0xf3f1] = thunk >> 8;
}
// Better random numbers
if (1) {
// 8D:FFC1 new_random_gen:
int new_routine = 0xffc1;
uint8_t *p = rom + 0x60000, *tp = p + new_routine;
*tp++ = 0xad; *tp++ = 0xa1; *tp++ = 0x0f; // mov.b A, byte_7E0FA1
*tp++ = 0x18; *tp++ = 0x65; *tp++ = 0x1a; // add.b A, frame_counter
*tp++ = 0x4a; // lsr A
*tp++ = 0xb0; *tp++ = 0x02; // jnb loc_8DFFCC
*tp++ = 0x49; *tp++ = 0xb8; // eor.b A, #0xB8
*tp++ = 0x8d; *tp++ = 0xa1; *tp++ = 0x0f; // byte_7E0FA1, A
*tp++ = 0x18; // clc
*tp++ = 0x6b; // retf
p[0xBA71] = 0x4c; p[0xBA72] = new_routine; p[0xBA73] = new_routine >> 8;
}
{
}
// Fix so SmashRockPile_fromLift / Overworld_DoMapUpdate32x32_B preserves R2/R0 destroyed
{
/*
.9B:BFA2 A5 00 mov.w A, R0
.9B:BFA4 48 push A
.9B:BFA5 A5 02 mov.w A, R2
.9B:BFA7 48 push A
.9B:C0F1 22 5C AD 02 callf Overworld_DoMapUpdate32x32_B
.9B:C048 68 pop A
.9B:C049 85 00 mov.w R0, A
.9B:C04B 68 pop A
.9B:C04C 85 02 mov.w R2, A
*/
uint8_t *tp = rom + 0x6ffd8;
*tp++ = 0xa5; *tp++ = 0x00; *tp++ = 0x48;
*tp++ = 0xa5; *tp++ = 0x02; *tp++ = 0x48;
*tp++ = 0x22; *tp++ = 0x5c; *tp++ = 0xad; *tp++ = 0x02;
*tp++ = 0xc2; *tp++ = 0x30;
*tp++ = 0x68; *tp++ = 0x85; *tp++ = 0x02;
*tp++ = 0x68; *tp++ = 0x85; *tp++ = 0x00;
*tp++ = 0x6b;
int target = 0xDFFD8; // DoorAnim_DoWork2_Preserving
rom[0xdc0f2] = target;
rom[0xdc0f3] = target >> 8;
rom[0xdc0f4] = target >> 16;
}
rom[0x2dec7] = 0; // Fix Uncle_Embark reading bad ram
rom[0x4be5e] = 0; // Overlord05_FallingStalfos doesn't initialize the sprite_D memory location
rom[0xD79A4] = 0; // 0x1AF9A4: // Lanmola_SpawnShrapnel uses undefined carry value
rom[0xF0A46] = 0; // 0x1E8A46 Helmasaur Carry Junk
rom[0xF0A52] = 0; // 0x1E8A52 Helmasaur Carry Junk
rom[0xef9b9] = 0xb9; // TalkingTree_SpitBomb
rom[0xdf107] = 0xa2;
rom[0xdf108] = 0x03;
rom[0xdf109] = 0x6b; // Palette_AgahnimClone destoys X
rom[0x4a966] = 0; // Follower_AnimateMovement_preserved
PatchRomBP(rom, 0x1de0e5);
PatchRomBP(rom, 0x6d0b6);
PatchRomBP(rom, 0x6d0c6);
PatchRomBP(rom, 0x1d8f29); // adc instead of add
PatchRomBP(rom, 0x06ED0B);
PatchRomBP(rom, 0x1dc812); // adc instead of add
PatchRomBP(rom, 0x9b46c); // adc instead of add
PatchRomBP(rom, 0x9b478); // adc instead of add
PatchRomBP(rom, 0x9B468); // sbc
PatchRomBP(rom, 0x9B46A);
PatchRomBP(rom, 0x9B474);
PatchRomBP(rom, 0x9B476);
PatchRomBP(rom, 0x9B60C);
PatchRomBP(rom, 0x8f708); // don't init scratch_c
PatchRomBP(rom, 0x1DCDEB); // y is destroyed earlier, restore it..
// Smithy_Frog doesn't save X
memmove(rom + 0x332b8, rom + 0x332b7, 4); rom[0x332b7] = 0xfa;
// This needs to be here because the ancilla code reads
// from the apu and we don't want to make the core code
// dependent on the apu timings, so relocated this value
// to 0x648.
rom[0x443fe] = 0x48; rom[0x443ff] = 0x6;
rom[0x44607] = 0x48; rom[0x44608] = 0x6;
// AncillaAdd_AddAncilla_Bank09 destroys R14
rom[0x49d0c] = 0xda; rom[0x49d0d] = 0xfa;
rom[0x49d0f] = 0xda; rom[0x49d10] = 0xfa;
}
static const char *const kReferenceSaves[] = {
"Chapter 1 - Zelda's Rescue.sav",
"Chapter 2 - After Eastern Palace.sav",
"Chapter 3 - After Desert Palace.sav",
"Chapter 4 - After Tower of Hera.sav",
"Chapter 5 - After Hyrule Castle Tower.sav",
"Chapter 6 - After Dark Palace.sav",
"Chapter 7 - After Swamp Palace.sav",
"Chapter 8 - After Skull Woods.sav",
"Chapter 9 - After Gargoyle's Domain.sav",
"Chapter 10 - After Ice Palace.sav",
"Chapter 11 - After Misery Mire.sav",
"Chapter 12 - After Turtle Rock.sav",
"Chapter 13 - After Ganon's Tower.sav",
};
void SaveLoadSlot(int cmd, int which) {
char name[128];
if (which & 256) {
if (cmd == kSaveLoad_Save)
return;
sprintf(name, "saves/ref/%s", kReferenceSaves[which - 256]);
} else {
sprintf(name, "saves/save%d.sav", which);
}
FILE *f = fopen(name, cmd != kSaveLoad_Save ? "rb" : "wb");
if (f) {
printf("*** %s slot %d\n",
cmd==kSaveLoad_Save ? "Saving" : cmd==kSaveLoad_Load ? "Loading" : "Replaying", which);
if (cmd != kSaveLoad_Save)
StateRecorder_Load(&state_recorder, f, cmd == kSaveLoad_Replay);
else
StateRecorder_Save(&state_recorder, f);
fclose(f);
}
}
void ZeldaReadSram(Snes *snes) {
FILE *f = fopen("saves/sram.dat", "rb");
if (f) {
fread(g_zenv.sram, 1, 8192, f);
memcpy(snes->cart->ram, g_zenv.sram, 8192);
fclose(f);
}
}
void ZeldaWriteSram() {
rename("saves/sram.dat", "saves/sram.bak");
FILE *f = fopen("saves/sram.dat", "wb");
if (f) {
fwrite(g_zenv.sram, 1, 8192, f);
fclose(f);
} else {
fprintf(stderr, "Unable to write saves/sram.dat\n");
}
}
typedef struct StateRecoderMultiPatch {
uint32 count;
uint32 addr;
uint8 vals[256];
} StateRecoderMultiPatch;
void StateRecoderMultiPatch_Init(StateRecoderMultiPatch *mp) {
mp->count = mp->addr = 0;
}
void StateRecoderMultiPatch_Commit(StateRecoderMultiPatch *mp) {
if (mp->count)
StateRecorder_RecordPatchByte(&state_recorder, mp->addr, mp->vals, mp->count);
}
void StateRecoderMultiPatch_Patch(StateRecoderMultiPatch *mp, uint32 addr, uint8 value) {
if (mp->count >= 256 || addr != mp->addr + mp->count) {
StateRecoderMultiPatch_Commit(mp);
mp->addr = addr;
mp->count = 0;
}
mp->vals[mp->count++] = value;
g_emulated_ram[addr] = g_ram[addr] = value;
}
void PatchCommand(char c) {
StateRecoderMultiPatch mp;
StateRecoderMultiPatch_Init(&mp);
if (c == 'w') {
StateRecoderMultiPatch_Patch(&mp, 0xf372, 80); // health filler
StateRecoderMultiPatch_Patch(&mp, 0xf373, 80); // magic filler
// b.Patch(0x1FE01, 25);
} else if (c == 'k') {
StateRecorder_ClearKeyLog(&state_recorder);
} else if (c == 'o') {
StateRecoderMultiPatch_Patch(&mp, 0xf36f, 1);
} else if (c == 'l') {
StateRecorder_StopReplay(&state_recorder);
}
StateRecoderMultiPatch_Commit(&mp);
}