From cefe86b749ed699cd8af96e4875bb4e90e967569 Mon Sep 17 00:00:00 2001
From: notaz <notasas@gmail.com>
Date: Mon, 21 Mar 2011 22:52:38 +0200
Subject: [PATCH] try to align timing with LCD refresh

---
 frontend/menu.c           | 19 +++++++++++++++++--
 frontend/plugin_lib.c     | 18 +++++++++++++++++-
 libpcsxcore/psxcommon.c   |  2 +-
 libpcsxcore/psxcounters.c |  2 +-
 4 files changed, 36 insertions(+), 5 deletions(-)

diff --git a/frontend/menu.c b/frontend/menu.c
index 546125ff..da1caeaa 100644
--- a/frontend/menu.c
+++ b/frontend/menu.c
@@ -567,6 +567,20 @@ static void apply_filter(int which)
 	old = which;
 }
 
+static void apply_lcdrate(int pal)
+{
+	static int old = -1;
+	char buf[128];
+
+	if (pal == old)
+		return;
+
+	snprintf(buf, sizeof(buf), "%s/op_lcdrate.sh %d",
+			pnd_script_base, pal ? 50 : 60);
+	system(buf);
+	old = pal;
+}
+
 static menu_entry e_menu_gfx_options[];
 
 static void pnd_menu_init(void)
@@ -1739,8 +1753,6 @@ void menu_prepare_emu(void)
 	case SCALE_CUSTOM:
 		break;
 	}
-	apply_filter(filter);
-	apply_cpu_clock();
 
 	psxCpu = (Config.Cpu == CPU_INTERPRETER) ? &psxInt : &psxRec;
 	if (psxCpu != prev_cpu)
@@ -1753,6 +1765,9 @@ void menu_prepare_emu(void)
 		CDR_stop();
 
 	menu_sync_config();
+	apply_lcdrate(Config.PsxType);
+	apply_filter(filter);
+	apply_cpu_clock();
 
 	if (GPU_open != NULL) {
 		int ret = GPU_open(&gpuDisp, "PCSX", NULL);
diff --git a/frontend/plugin_lib.c b/frontend/plugin_lib.c
index 46c9cbd9..c2fa1005 100644
--- a/frontend/plugin_lib.c
+++ b/frontend/plugin_lib.c
@@ -35,6 +35,7 @@ static int pl_fbdev_w, pl_fbdev_h, pl_fbdev_bpp;
 static int flip_cnt, vsync_cnt, flips_per_sec, tick_per_sec;
 static float vsps_cur;
 static int plugin_skip_advice;
+static int vsync_usec_time;
 // P.E.Op.S.
 extern int UseFrameSkip;
 extern float fps_skip;
@@ -121,8 +122,18 @@ void *pl_fbdev_flip(void)
 
 int pl_fbdev_open(void)
 {
+	struct timeval now;
+
 	pl_fbdev_buf = vout_fbdev_flip(layer_fb);
 	omap_enable_layer(1);
+
+	// try to align redraws to vsync
+	vout_fbdev_wait_vsync(layer_fb);
+	gettimeofday(&now, 0);
+	vsync_usec_time = now.tv_usec;
+	while (vsync_usec_time >= pl_frame_interval)
+		vsync_usec_time -= pl_frame_interval;
+
 	return 0;
 }
 
@@ -184,7 +195,7 @@ void pl_frame_limit(void)
 	static struct timeval tv_old, tv_expect;
 	static int vsync_cnt_prev;
 	struct timeval now;
-	int diff;
+	int diff, usadj;
 
 	vsync_cnt++;
 
@@ -227,6 +238,11 @@ void pl_frame_limit(void)
 		//printf("pl_frame_limit reset, diff=%d, iv %d\n", diff, pl_frame_interval);
 		tv_expect = now;
 		diff = 0;
+		// try to align with vsync
+		usadj = vsync_usec_time;
+		while (usadj < tv_expect.tv_usec - pl_frame_interval)
+			usadj += pl_frame_interval;
+		tv_expect.tv_usec = usadj;
 	}
 
 	if (!(g_opts & OPT_NO_FRAMELIM) && diff > pl_frame_interval) {
diff --git a/libpcsxcore/psxcommon.c b/libpcsxcore/psxcommon.c
index 5e9dcafb..ea655dfa 100644
--- a/libpcsxcore/psxcommon.c
+++ b/libpcsxcore/psxcommon.c
@@ -56,8 +56,8 @@ void EmuUpdate() {
 	if (!Config.HLE || !hleSoftCall)
 		SysUpdate();
 
-	pl_frame_limit();
 	ApplyCheats();
+	pl_frame_limit();
 }
 
 void __Log(char *fmt, ...) {
diff --git a/libpcsxcore/psxcounters.c b/libpcsxcore/psxcounters.c
index c9f29315..044d0d38 100644
--- a/libpcsxcore/psxcounters.c
+++ b/libpcsxcore/psxcounters.c
@@ -300,8 +300,8 @@ void psxRcntUpdate()
             GPU_vBlank( 0 );
             setIrq( 0x01 );
 
-            GPU_updateLace();
             EmuUpdate();
+            GPU_updateLace();
         }
     }
 
-- 
2.39.5