Improve video sync

Added a Vblank callback

Author: allkern

frontend/main.c

@@ -25,6 +25,7 @@ int main(int argc, const char* argv[]) {
     psxe_screen_reload(screen);
 
     psx_gpu_set_event_callback(gpu, GPU_EVENT_DMODE, psxe_gpu_dmode_event_cb);
+    psx_gpu_set_event_callback(gpu, GPU_EVENT_VBLANK, psxe_gpu_vblank_event_cb);
     psx_gpu_set_udata(gpu, 0, screen);
 
     if (cfg->exe) {
@@ -36,9 +37,8 @@ int main(int argc, const char* argv[]) {
     }
 
     while (psxe_screen_is_open(screen)) {
-        psx_run_frame(psx);
-
-        psxe_screen_update(screen);
+        // psx_run_frame(psx);
+        psx_update(psx);
     }
 
     psx_cpu_t* cpu = psx_get_cpu(psx);

frontend/screen.c

@@ -186,4 +186,10 @@ void psxe_gpu_dmode_event_cb(psx_gpu_t* gpu) {
         screen->width * screen->scale,
         screen->height * screen->scale
     );
+}
+
+void psxe_gpu_vblank_event_cb(psx_gpu_t* gpu) {
+    psxe_screen_t* screen = gpu->udata[0];
+
+    psxe_screen_update(screen);
 }

frontend/screen.h

@@ -35,5 +35,6 @@ void psxe_screen_toggle_debug_mode(psxe_screen_t*);
 
 // GPU event handlers
 void psxe_gpu_dmode_event_cb(psx_gpu_t*);
+void psxe_gpu_vblank_event_cb(psx_gpu_t*);
 
 #endif

psx/dev/gpu.c

@@ -889,6 +889,9 @@ void gpu_scanline_event(psx_gpu_t* gpu) {
     }
 
     if (gpu->line == GPU_SCANS_PER_VDRAW_NTSC) {
+        if (gpu->event_cb_table[GPU_EVENT_VBLANK])
+            gpu->event_cb_table[GPU_EVENT_VBLANK](gpu);
+
         psx_ic_irq(gpu->ic, IC_VBLANK);
     } else if (gpu->line == GPU_SCANS_PER_FRAME_NTSC) {
         gpu->line = 0;