1 files changed, 80 insertions, 2 deletions
diff --git a/source/nds/entry.cpp b/source/nds/entry.cpp
index d9050ca..63d736f 100644
--- a/source/nds/entry.cpp
+++ b/source/nds/entry.cpp
@@ -693,8 +693,7 @@ void S9xSyncSpeed ()
 				// paused, so do nothing.
 				if (syncdif <= -11719 /* 500.0 ms late or more */)
 					sync_next = syncnow + frame_time * (auto_equivalent_skip + 1);
-				// Tolerate 1/16 late without skipping.
-				else if (syncdif < -(frame_time * auto_equivalent_skip / 16) && auto_equivalent_skip < 7)
+				else if (auto_equivalent_skip < 7)
 					auto_equivalent_skip++;
 			}
 			if (auto_equivalent_skip >= 8)
@@ -710,6 +709,85 @@ void S9xSyncSpeed ()
 			IPPU.RenderThisFrame = FALSE;
 		}
 
+#if 0
+		// frame_time is in getSysTime units: 42.667 microseconds.
+		uint32 frame_time = Settings.PAL ? 468 /* = 20.0 ms */ : 391 /* = 16.67 ms */;
+		if (sync_last > syncnow) // Overflow occurred! (every 50 hrs)
+		{
+			// Render this frame regardless, set the
+			// sync_next, and get the hell out.
+			IPPU.RenderThisFrame = TRUE;
+			sync_last = syncnow;
+			sync_next = syncnow + frame_time;
+			return;
+		}
+		sync_last = syncnow;
+		// If this is positive, we have syncdif*42.66 microseconds to
+		// spare.
+		// If this is negative, we're late by syncdif*42.66
+		// microseconds.
+		syncdif = sync_next - syncnow;
+		if (syncdif < 0 && syncdif >= -(frame_time / 2))
+		{
+			// We're late, but by less than half a frame. Draw it
+			// anyway. If the next frame is too late, it'll be
+			// skipped.
+			skip_rate = 0;
+			IPPU.RenderThisFrame = true;
+			sync_next += frame_time;
+		}
+		else if(syncdif < 0)
+		{
+			/*
+			 * If we're consistently late, delay up to 8 frames.
+			 * 
+			 * That really helps with certain games, such as
+			 * Super Mario RPG and Yoshi's Island.
+			 */
+			if(++skip_rate < 10)
+			{
+				if(syncdif >= -11719 /* not more than 500.0 ms late */)
+				{
+					IPPU.RenderThisFrame = FALSE;
+					sync_next += frame_time;
+				}
+				else
+				{	//lag more than 0.5s, maybe paused
+					IPPU.RenderThisFrame = TRUE;
+					sync_next = syncnow + frame_time;
+					framenum = 0;
+				}
+			}
+			else
+			{
+				skip_rate = 0;
+				IPPU.RenderThisFrame = TRUE;
+				sync_next = syncnow + frame_time;
+			}
+		}
+		else // Early
+		{
+			skip_rate = 0;
+			ds2_setCPUclocklevel(0);
+			if (syncdif > 0)
+				udelay(syncdif * 128 / 3 /* times 42 + 2/3 microseconds */);
+			set_cpu_clock(clock_speed_number);
+			S9xProcessSound (0);
+
+			IPPU.RenderThisFrame = TRUE;
+			sync_next += frame_time;
+		}
+/*
+		if(++framenum >= 60)
+		{
+			syncdif = syncnow - sync_last;
+			sync_last = syncnow;
+			framenum = 0;
+			//printf("T %d %d\n", syncdif*42667/1000, realframe);
+			realframe = 0;
+		}
+*/
+#endif
 	}
 	else /* if (Settings.SkipFrames != AUTO_FRAMERATE && !game_fast_forward) */
 	{