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https://github.com/DrBeef/Doom3Quest.git
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Frame tic smoothing logic
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1 changed files with 62 additions and 11 deletions
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@ -49,8 +49,8 @@ extern "C" int questType;
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idCVar idSessionLocal::com_showAngles( "com_showAngles", "0", CVAR_SYSTEM | CVAR_BOOL, "" );
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idCVar idSessionLocal::com_minTics( "com_minTics", "1", CVAR_SYSTEM, "" );
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idCVar idSessionLocal::com_showTics( "com_showTics", "0", CVAR_SYSTEM | CVAR_BOOL, "" );
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idCVar idSessionLocal::com_skipTics( "com_skipTics", "1", CVAR_SYSTEM | CVAR_BOOL | CVAR_ARCHIVE, "Skip all missed tics and only use one tick per frame, won't be used on Quest 1" );
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idCVar idSessionLocal::com_showTics( "com_showTics", "1", CVAR_SYSTEM | CVAR_BOOL, "" );
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idCVar idSessionLocal::com_skipTics( "com_skipTics", "1", CVAR_SYSTEM | CVAR_BOOL | CVAR_ARCHIVE, "Skip all missed tics and only use one tick per frame, unless in a low fps situation, then process all tics" );
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idCVar idSessionLocal::com_fixedTic( "com_fixedTic", "0", CVAR_SYSTEM | CVAR_INTEGER | CVAR_ARCHIVE, "", -1, 10 );
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idCVar idSessionLocal::com_showDemo( "com_showDemo", "0", CVAR_SYSTEM | CVAR_BOOL, "" );
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idCVar idSessionLocal::com_skipGameDraw( "com_skipGameDraw", "0", CVAR_SYSTEM | CVAR_BOOL, "" );
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@ -2526,6 +2526,41 @@ void idSessionLocal::UpdateScreen( bool outOfSequence ) {
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insideUpdateScreen = false;
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}
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#define FPS_FRAMES 5
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int calcFPS( ) {
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static int previousTimes[FPS_FRAMES];
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static int index;
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int i, total;
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static int fps = 0;
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static int previous;
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int t, frameTime;
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// don't use serverTime, because that will be drifting to
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// correct for internet lag changes, timescales, timedemos, etc
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t = Sys_Milliseconds();
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frameTime = t - previous;
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previous = t;
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previousTimes[index % FPS_FRAMES] = frameTime;
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index++;
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if (index > FPS_FRAMES) {
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// average multiple frames together to smooth changes out a bit
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total = 0;
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for (i = 0; i < FPS_FRAMES; i++) {
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total += previousTimes[i];
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}
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if (!total) {
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total = 1;
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}
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fps = 10000 * FPS_FRAMES / total;
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fps = (fps + 5) / 10;
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common->Printf( " FPS: %i ", fps );
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}
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return fps;
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}
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/*
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===============
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idSessionLocal::Frame
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@ -2732,6 +2767,26 @@ void idSessionLocal::Frame() {
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int gameTicsToRun = latchedTicNumber - lastGameTic;
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// DrBeef's "smoothing out" logic, dodgy, but seems to do the trick
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//
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// This is here because, for example, if we are running at 60hz, then the game tic interval is
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// 16ms, which actually means 63 tics per second, so every half second or so we get an extra tic.
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// This extra tic results is a movement glitch (subtle, but annoying when you are aware of it)
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// because you move two tics worth of distance compared to the other frames, which is more obvious in VR.
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//
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// The solution is to just skip these extra tics, however if we skip all extra tics and only process
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// one per frame then if the fps drop due to a lot of action, the whole game slows down, which isn't desriable.
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// Therefore we only want to skip isolated instances of a single extra tic if we are maintaining almost max frame rate
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int fps = calcFPS();
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bool skipTics = false;
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if ( com_skipTics.GetBool() && gameTicsToRun > 1)
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{
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int refresh = renderSystem->GetRefresh();
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//Skip extra tics if we are maintaining 95% of the intended refresh rate
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skipTics = (fps >= (refresh * 0.95F ));
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}
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int i;
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for ( i = 0 ; i < gameTicsToRun ; i++ )
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{
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@ -2741,18 +2796,14 @@ void idSessionLocal::Frame() {
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break;
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}
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if ( syncNextGameFrame ) {
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if ( syncNextGameFrame || skipTics) {
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// Do this in case skipTics is true but this flag isn't, since RunGameTic will reset the
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// syncNextGameFrame flag
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syncNextGameFrame = true;
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// long game frame, so break out and continue executing as if there was no hitch
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break;
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}
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//Bit of a hack to smooth things out - needs proper testing
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//only allow quest 2 to do this, quest 1 will slowdown too much with this enabled so
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//prevent it being used on Q1
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if ( questType == 2 && com_skipTics.GetBool() && gameTicsToRun > 1 ) {
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syncNextGameFrame = true;
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break;
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}
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}
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}
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