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#include "gb.h"
#include "cpu.h"
#include "render.h"
#include "control.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <signal.h>
static volatile sig_atomic_t running = 1;
static void on_sig(int s) { (void)s; running = 0; }
static double now_sec(void) {
struct timespec ts;
clock_gettime(CLOCK_MONOTONIC, &ts);
return ts.tv_sec + ts.tv_nsec / 1e9;
}
static void run_frame(GB *gb) {
gb->ppu.frame_ready = false;
// safety bound in case LCD is off (no frame_ready)
u64 budget = gb->cycles + 70224 * 2;
while (!gb->ppu.frame_ready && gb->cycles < budget)
cpu_step(gb);
}
int main(int argc, char **argv) {
if (argc < 2) {
fprintf(stderr, "usage: %s <rom> [--test seconds] [--sixel [scale]] "
"[--frameskip n] [--fps n] [--uncapped] [--fifo [path]] "
"[--sock [path]]\n",
argv[0]);
return 1;
}
const char *rom = argv[1];
bool test = false;
double seconds = 30.0;
int shot_frames = -1;
const char *shot_path = "shot.ppm";
const char *fifo_path = NULL;
const char *sock_path = NULL;
double target_fps = 59.73; // emulation speed cap; 0 = uncapped
int frameskip = 0; // draw 1 of every (frameskip+1) frames
bool sixel = false; // use sixel graphics output
int sixel_scale = 2; // integer pixel zoom for sixel
for (int i = 2; i < argc; i++) {
if (!strcmp(argv[i], "--test")) {
test = true;
if (i + 1 < argc) seconds = atof(argv[++i]);
} else if (!strcmp(argv[i], "--shot")) {
if (i + 1 < argc) shot_frames = atoi(argv[++i]);
if (i + 1 < argc && argv[i+1][0] != '-') shot_path = argv[++i];
} else if (!strcmp(argv[i], "--fifo")) {
fifo_path = (i + 1 < argc && argv[i+1][0] != '-')
? argv[++i] : "/tmp/gbc.fifo";
} else if (!strcmp(argv[i], "--sock") || !strcmp(argv[i], "--socket")) {
sock_path = (i + 1 < argc && argv[i+1][0] != '-')
? argv[++i] : "/tmp/gbc.sock";
} else if (!strcmp(argv[i], "--fps")) {
if (i + 1 < argc) target_fps = atof(argv[++i]);
} else if (!strcmp(argv[i], "--frameskip")) {
if (i + 1 < argc) frameskip = atoi(argv[++i]);
} else if (!strcmp(argv[i], "--sixel")) {
sixel = true;
if (i + 1 < argc && argv[i+1][0] != '-') sixel_scale = atoi(argv[++i]);
} else if (!strcmp(argv[i], "--uncapped") || !strcmp(argv[i], "--turbo")) {
target_fps = 0;
}
}
if (frameskip < 0) frameskip = 0;
GB *gb = calloc(1, sizeof(GB));
if (cart_load(&gb->cart, rom) != 0) { free(gb); return 1; }
gb_reset(gb);
if (test) {
gb->serial_log = true;
u64 target = (u64)(seconds * 4194304.0);
while (gb->cycles < target) cpu_step(gb);
fprintf(stderr, "\n[ran %llu cycles]\n", (unsigned long long)gb->cycles);
cart_free(&gb->cart);
free(gb);
return 0;
}
if (shot_frames >= 0) {
for (int f = 0; f < shot_frames; f++) run_frame(gb);
FILE *pf = fopen(shot_path, "wb");
fprintf(pf, "P6\n%d %d\n255\n", SCREEN_W, SCREEN_H);
for (int y = 0; y < SCREEN_H; y++)
for (int x = 0; x < SCREEN_W; x++)
fwrite(gb->ppu.fb[y][x], 1, 3, pf);
fclose(pf);
fprintf(stderr, "wrote %s after %d frames\n", shot_path, shot_frames);
cart_free(&gb->cart); free(gb); return 0;
}
signal(SIGINT, on_sig);
signal(SIGTERM, on_sig);
if (fifo_path) {
input_open_fifo(fifo_path);
fprintf(stderr, "control fifo: echo 'a' > %s (a b start select "
"up down left right; +x/-x hold/release; release)\n", fifo_path);
}
if (sock_path) {
control_open(sock_path);
if (control_active())
fprintf(stderr, "control socket: %s (buttons + debug: cpu read "
"write step break watch continue pause; 'help')\n",
sock_path);
}
if (sixel) render_set_sixel(true, sixel_scale);
term_init();
// The emulator always advances every GB frame at the paced native rate so
// games run at correct speed. Frame *skipping* only affects how often we
// actually draw to the terminal: rendering is the expensive part, so on a
// slow terminal we render 1 of every (frameskip+1) frames while emulation
// keeps real-time. In turbo we run uncapped and additionally clamp redraws
// to ~60 Hz so the terminal isn't flooded.
bool turbo = (target_fps <= 0);
double last_render = 0;
double start_time = now_sec();
double next_emu = start_time;
u64 frames = 0, drawn = 0;
int since_render = 0;
while (running) {
frames++;
if (!input_poll(gb)) break;
if (!control_poll(gb)) break; // socket may inject input / debug cmds
if (input_take_turbo()) turbo = !turbo;
frameskip += input_take_frameskip_delta();
if (frameskip < 0) frameskip = 0;
if (frameskip > 30) frameskip = 30;
render_set_hud(frameskip, turbo);
// Emulate a full frame, honoring debugger pause/step/breakpoints when
// the control socket is active (otherwise a plain full frame).
control_run_frame(gb);
// decide whether to draw this frame
bool do_render = (since_render >= frameskip);
double t = now_sec();
if (do_render && turbo && (t - last_render) < 1.0 / 60.0)
do_render = false; // clamp turbo redraws to ~60 Hz
if (do_render) {
render_frame(gb);
last_render = t;
since_render = 0;
drawn++;
} else {
since_render++;
}
// pace emulation to native speed (skip sleeping in turbo)
double emu_dt = turbo ? 0.0 : 1.0 / target_fps;
if (emu_dt > 0.0) {
next_emu += emu_dt;
double sleep = next_emu - now_sec();
if (sleep > 0) {
struct timespec ts = { (time_t)sleep,
(long)((sleep - (time_t)sleep) * 1e9) };
nanosleep(&ts, NULL);
} else if (sleep < -0.1) {
next_emu = now_sec(); // fell behind; resync
}
} else {
next_emu = now_sec(); // uncapped: keep baseline fresh
}
}
term_restore();
input_close_fifo();
control_close();
double elapsed = now_sec() - start_time;
if (elapsed > 0)
fprintf(stderr, "emulated %llu frames (%.1f fps), drew %llu (%.1f fps) "
"in %.2fs\n", (unsigned long long)frames, frames / elapsed,
(unsigned long long)drawn, drawn / elapsed, elapsed);
cart_free(&gb->cart);
free(gb);
return 0;
}
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