Glide Plugin GLES2 port from mupen64plus-ae, but with special FrameSkip code

[mupen64plus-pandora.git] / source / gles2glide64 / src / Glide64 / FrameSkipper.cpp

diff --git a/source/gles2glide64/src/Glide64/FrameSkipper.cpp b/source/gles2glide64/src/Glide64/FrameSkipper.cpp
new file mode 100755 (executable)
index 0000000..7bd81e9
--- /dev/null
+++ b/source/gles2glide64/src/Glide64/FrameSkipper.cpp
@@ -0,0 +1,142 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ *   Copyright (C) 2011 yongzh (freeman.yong@gmail.com)                    *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ *   This program is distributed in the hope that it will be useful,       *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program; if not, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.          *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+#include "FrameSkipper.h"
+#include "ticks.h"
+#include <stdio.h>
+
+FrameSkipper::FrameSkipper()
+       : skipType(AUTO), maxSkips(2), targetFPS(60)
+{
+}
+
+void FrameSkipper::start()
+{
+       initialTicks = 0;
+       virtualCount = 0;
+       skipCounter = 0;
+       oldSkip = 0;
+}
+#if 0
+bool FrameSkipper::hasSkipped()
+{
+       oldSkip = skipCounter;
+       
+       if (skipType == MANUAL) {
+               if (++skipCounter > maxSkips)
+                       skipCounter = 0;
+//printf("frameskipper(Manual): oldSkip=%i, skipCounter=%i, countVI=%i\n", oldSkip, skipCounter, countVI);
+               countVI = 0;
+               return (oldSkip>0);
+       }
+
+       unsigned int elapsed = ticksGetTicks()/* - initialTicks*/;
+       int realCount = (elapsed-initialTicks - 4) * targetFPS; // 4ms tolerance
+       if ((realCount > countVI*1000) && (skipCounter < maxSkips) && (countVI<10)) {
+               skipCounter++;
+//printf("Skip frame elapsed=%u realCount=%u countVI=%u skipCounter=%i\n", elapsed-initialTicks, realCount, countVI, skipCounter);
+       } else {
+//printf(" Ok  frame elapsed=%u realCount=%u countVI=%u skipCounter=%i\n", elapsed-initialTicks, realCount, countVI, skipCounter);
+               skipCounter = 0;
+               initialTicks=elapsed;
+               virtualCount=0;
+               countVI=0;
+       }
+//printf("frameskipper(Auto): oldSkip=%i, skipCounter=%i, countVI=%i, realCount=%u\n", oldSkip, skipCounter, countVI, realCount);
+       return (oldSkip>0);
+}
+#else
+void FrameSkipper::newFrame()
+{
+       oldSkip = skipCounter;
+       
+       if (skipType == MANUAL) {
+               if (++skipCounter > maxSkips)
+                       skipCounter = 0;
+//printf("frameskipper(Manual): oldSkip=%i, skipCounter=%i, countVI=%i\n", oldSkip, skipCounter, countVI);
+               countVI = 0;
+               return;
+       }
+
+       unsigned int elapsed = ticksGetTicks()/* - initialTicks*/;
+       int realCount = (elapsed-initialTicks - 4) * targetFPS; // 4ms tolerance
+       if ((realCount > countVI*1000) && (skipCounter < maxSkips) && (countVI<10)) {
+               skipCounter++;
+//printf("Skip frame elapsed=%u realCount=%u countVI=%u skipCounter=%i\n", elapsed-initialTicks, realCount, countVI, skipCounter);
+       } else {
+//printf(" Ok  frame elapsed=%u realCount=%u countVI=%u skipCounter=%i\n", elapsed-initialTicks, realCount, countVI, skipCounter);
+               skipCounter = 0;
+               initialTicks=elapsed;
+               virtualCount=0;
+               countVI=0;
+       }
+//printf("frameskipper(Auto): oldSkip=%i, skipCounter=%i, countVI=%i, realCount=%u\n", oldSkip, skipCounter, countVI, realCount);
+       return;
+}
+#endif
+
+void FrameSkipper::update()
+{
+#if 1
+       if (initialTicks == 0) {
+               initialTicks = ticksGetTicks();
+       }
+       countVI++;
+       
+       if (countVI>20) {
+               skipCounter=0;          // failsafe...
+       }
+#else
+       // for the first frame
+       if (initialTicks == 0) {
+               initialTicks = ticksGetTicks();
+               return;
+       }
+       
+       oldSkip=skipCounter;
+       
+       if (skipType == MANUAL) {
+               if (++skipCounter > maxSkips)
+                       skipCounter = 0;
+               return;
+       }
+
+       unsigned int elapsed = ticksGetTicks()/* - initialTicks*/;
+       unsigned int realCount = (elapsed-initialTicks) * targetFPS;
+
+       virtualCount+=1000;
+//     if (realCount >= virtualCount) {
+               if (realCount > virtualCount+100 &&
+                               /*skipType == AUTO &&*/ skipCounter < maxSkips) {
+                       skipCounter++;
+//printf("Skip frame elapsed=%u initialTicks=%u realCount=%u virtualCound=%u skipCounter=%i\n", elapsed, initialTicks, realCount, virtualCount, skipCounter);
+               } else {
+//                     virtualCount = realCount;
+//                     if (skipType == AUTO)
+                               skipCounter = 0;
+                       initialTicks=elapsed;
+                       virtualCount=0;
+               }
+/*     } else {
+               skipCounter = 0;
+               initialTicks=elapsed;
+               virtualCount=0;
+       }*/
+#endif
+}