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Frame skipping

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Skip up to 3 frames of rendering if the time between tics
exceeds TICRATE. If rendering is a significant source of
that slowdown, skipping some frames can speed up the game
loop and improve input responsiveness.
This commit is contained in:
James R 2023-10-16 05:00:09 -07:00
parent 2e1983dd7f
commit 1b19ad8890
1 changed files with 31 additions and 5 deletions
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36
src/d_main.cpp
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@ -328,8 +328,9 @@ gamestate_t wipegamestate = GS_LEVEL;
INT16 wipetypepre = -1;
INT16 wipetypepost = -1;
static void D_Display(void)
static bool D_Display(void)
{
bool ranwipe = false;
boolean forcerefresh = false;
static boolean wipe = false;
INT32 wipedefindex = 0;
@ -340,7 +341,7 @@ static void D_Display(void)
if (!dedicated)
{
if (nodrawers)
return; // for comparative timing/profiling
return false; // for comparative timing/profiling
// Lactozilla: Switching renderers works by checking
// if the game has to do it right when the frame
@ -409,6 +410,7 @@ static void D_Display(void)
F_WipeColorFill(31);
F_WipeEndScreen();
F_RunWipe(wipedefindex, wipetypepre, gamestate != GS_MENU, "FADEMAP0", false, false);
ranwipe = true;
}
if (G_GamestateUsesLevel() == false && rendermode != render_none)
@ -422,6 +424,7 @@ static void D_Display(void)
else //dedicated servers
{
F_RunWipe(wipedefindex, wipedefs[wipedefindex], gamestate != GS_MENU, "FADEMAP0", false, false);
ranwipe = true;
wipegamestate = gamestate;
}
@ -431,7 +434,7 @@ static void D_Display(void)
wipetypepre = -1;
if (dedicated) //bail out after wipe logic
return;
return false;
// Catch runaway clipping rectangles.
V_ClearClipRect();
@ -708,6 +711,7 @@ static void D_Display(void)
F_WipeEndScreen();
F_RunWipe(wipedefindex, wipedefs[wipedefindex], gamestate != GS_MENU && gamestate != GS_TITLESCREEN, "FADEMAP0", true, false);
ranwipe = true;
}
// reset counters so timedemo doesn't count the wipe duration
@ -763,6 +767,8 @@ static void D_Display(void)
I_FinishUpdate(); // page flip or blit buffer
ps_swaptime = I_GetPreciseTime() - ps_swaptime;
}
return ranwipe;
}
// =========================================================================
@ -779,6 +785,7 @@ void D_SRB2Loop(void)
boolean interp = false;
boolean doDisplay = false;
int frameskip = 0;
if (dedicated)
server = true;
@ -827,6 +834,8 @@ void D_SRB2Loop(void)
capbudget = (precise_t) budget;
}
bool ranwipe = false;
I_UpdateTime(cv_timescale.value);
if (lastwipetic)
@ -923,9 +932,9 @@ void D_SRB2Loop(void)
rendertimefrac_unpaused = FRACUNIT;
}
if (interp || doDisplay)
if ((interp || doDisplay) && !frameskip)
{
D_Display();
ranwipe = D_Display();
}
#ifdef HWRENDER
@ -976,6 +985,23 @@ void D_SRB2Loop(void)
finishprecise = I_GetPreciseTime();
deltasecs = (double)((INT64)(finishprecise - enterprecise)) / I_GetPrecisePrecision();
deltatics = deltasecs * NEWTICRATE;
// If time spent this game loop exceeds a single tic,
// it's probably because of rendering.
//
// Skip rendering the next frame, up to a limit of 3
// frames before a frame is rendered no matter what.
//
// Wipes run an inner loop and artificially increase
// the measured time.
if (!ranwipe && frameskip < 3 && deltatics > 1.0)
{
frameskip++;
}
else
{
frameskip = 0;
}
}
}