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Frame tic smoothing logic

This commit is contained in:
Simon 2020-11-28 15:20:28 +00:00
parent b227a2b64f
commit 6355e3ba48
1 changed files with 62 additions and 11 deletions
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73
Projects/Android/jni/d3es-multithread-master/neo/framework/Session.cpp
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@ -49,8 +49,8 @@ extern "C" int questType;
idCVar idSessionLocal::com_showAngles( "com_showAngles", "0", CVAR_SYSTEM | CVAR_BOOL, "" );
idCVar idSessionLocal::com_minTics( "com_minTics", "1", CVAR_SYSTEM, "" );
idCVar idSessionLocal::com_showTics( "com_showTics", "0", CVAR_SYSTEM | CVAR_BOOL, "" );
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" );
idCVar idSessionLocal::com_showTics( "com_showTics", "1", CVAR_SYSTEM | CVAR_BOOL, "" );
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" );
idCVar idSessionLocal::com_fixedTic( "com_fixedTic", "0", CVAR_SYSTEM | CVAR_INTEGER | CVAR_ARCHIVE, "", -1, 10 );
idCVar idSessionLocal::com_showDemo( "com_showDemo", "0", CVAR_SYSTEM | CVAR_BOOL, "" );
idCVar idSessionLocal::com_skipGameDraw( "com_skipGameDraw", "0", CVAR_SYSTEM | CVAR_BOOL, "" );
@ -2526,6 +2526,41 @@ void idSessionLocal::UpdateScreen( bool outOfSequence ) {
insideUpdateScreen = false;
}
#define FPS_FRAMES 5
int calcFPS( ) {
static int previousTimes[FPS_FRAMES];
static int index;
int i, total;
static int fps = 0;
static int previous;
int t, frameTime;
// don't use serverTime, because that will be drifting to
// correct for internet lag changes, timescales, timedemos, etc
t = Sys_Milliseconds();
frameTime = t - previous;
previous = t;
previousTimes[index % FPS_FRAMES] = frameTime;
index++;
if (index > FPS_FRAMES) {
// average multiple frames together to smooth changes out a bit
total = 0;
for (i = 0; i < FPS_FRAMES; i++) {
total += previousTimes[i];
}
if (!total) {
total = 1;
}
fps = 10000 * FPS_FRAMES / total;
fps = (fps + 5) / 10;
common->Printf( " FPS: %i ", fps );
}
return fps;
}
/*
===============
idSessionLocal::Frame
@ -2732,6 +2767,26 @@ void idSessionLocal::Frame() {
int gameTicsToRun = latchedTicNumber - lastGameTic;
// DrBeef's "smoothing out" logic, dodgy, but seems to do the trick
//
// This is here because, for example, if we are running at 60hz, then the game tic interval is
// 16ms, which actually means 63 tics per second, so every half second or so we get an extra tic.
// This extra tic results is a movement glitch (subtle, but annoying when you are aware of it)
// because you move two tics worth of distance compared to the other frames, which is more obvious in VR.
//
// The solution is to just skip these extra tics, however if we skip all extra tics and only process
// one per frame then if the fps drop due to a lot of action, the whole game slows down, which isn't desriable.
// Therefore we only want to skip isolated instances of a single extra tic if we are maintaining almost max frame rate
int fps = calcFPS();
bool skipTics = false;
if ( com_skipTics.GetBool() && gameTicsToRun > 1)
{
int refresh = renderSystem->GetRefresh();
//Skip extra tics if we are maintaining 95% of the intended refresh rate
skipTics = (fps >= (refresh * 0.95F ));
}
int i;
for ( i = 0 ; i < gameTicsToRun ; i++ )
{
@ -2741,16 +2796,12 @@ void idSessionLocal::Frame() {
break;
}
if ( syncNextGameFrame ) {
// long game frame, so break out and continue executing as if there was no hitch
break;
}
//Bit of a hack to smooth things out - needs proper testing
//only allow quest 2 to do this, quest 1 will slowdown too much with this enabled so
//prevent it being used on Q1
if ( questType == 2 && com_skipTics.GetBool() && gameTicsToRun > 1 ) {
if ( syncNextGameFrame || skipTics) {
// Do this in case skipTics is true but this flag isn't, since RunGameTic will reset the
// syncNextGameFrame flag
syncNextGameFrame = true;
// long game frame, so break out and continue executing as if there was no hitch
break;
}
}