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- restore legacy interpolation path behind CVAR cl_legacyintrpl.

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* Hoping the old path being available will allow the new code to be merged.
* Applied offset to sum of `(totalclk - ototalclk)` of 0.5 to ensure calculated smoothratio under legacy path always returns a value.
* For the above, consider Duke 3D with 4 game tics per ticrate, the returned values would be:
0
16384
32768
49152
* With offset of 0.5, the following values are returned depending on how far advanced `totalclk` is from `ototalclk`:
8192
24576
40960
57344
This commit is contained in:
Mitchell Richters 2020-07-31 20:10:00 +10:00 committed by Christoph Oelckers
parent 0aca26e197
commit 5000fde281
3 changed files with 41 additions and 20 deletions
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31
source/core/gamecontrol.cpp
View file

@ -1040,6 +1040,16 @@ void S_SetSoundPaused(int state)
int CalcSmoothRatio(const ClockTicks &totalclk, const ClockTicks &ototalclk, int realgameticspersec)
{
double ratio;
int result;
if (cl_debugintrpl)
{
Printf("ototalclk: %d\ntotalclk: %d\n", ototalclk, totalclk);
}
if (!cl_legacyintrpl)
{
double const gametics = 1'000'000'000. / realgameticspersec;
uint64_t currentTime = I_nsTime();
@ -1053,17 +1063,26 @@ int CalcSmoothRatio(const ClockTicks &totalclk, const ClockTicks &ototalclk, int
elapsedTime = 0;
}
lastTime = currentTime;
double ratioScale = elapsedTime / gametics;
int smoothratio = clamp(xs_CRoundToInt(MaxSmoothRatio * ratioScale), 0, MaxSmoothRatio);
ratio = elapsedTime / gametics;
if (cl_debugintrpl)
{
Printf("ototalclk: %d\ntotalclk: %d\ngametics: %.3f ms\nelapsedTime: %.3f ms\nratioScale: %f\nsmoothratio: %d\n",
ototalclk, totalclk, (gametics / 1'000'000.), (elapsedTime / 1'000'000.), ratioScale, smoothratio);
Printf("gametics: %.3f ms\nelapsedTime: %.3f ms\n", (gametics / 1'000'000.), (elapsedTime / 1'000'000.));
}
}
else
{
ratio = (0.5 + (totalclk - ototalclk)) / (120 / realgameticspersec);
}
return smoothratio;
result = clamp(xs_CRoundToInt(ratio * MaxSmoothRatio), 0, MaxSmoothRatio);
if (cl_debugintrpl)
{
Printf("ratio: %f\nresult: %d\n", ratio, result);
}
return result;
}
FString G_GetDemoPath()

3
source/core/gamecvars.cpp
View file

@ -90,7 +90,8 @@ CVARD(Bool, cl_slopetilting, false, CVAR_ARCHIVE, "enable/disable slope tilting"
CVARD(Int, cl_showweapon, 1, CVAR_ARCHIVE, "enable/disable show weapons") // only implemented in Blood
CVARD(Bool, cl_sointerpolation, true, CVAR_ARCHIVE, "enable/disable sector object interpolation") // only implemented in SW
CVARD(Bool, cl_syncinput, false, CVAR_ARCHIVE, "enable/disable synchronized input with game's ticrate") // only implemented in SW
CVARD(Bool, cl_debugintrpl, false, CVAR_NOSAVE, "print information regarding calculated smoothratio for interpolation") // only implemented in SW
CVARD(Bool, cl_debugintrpl, false, CVAR_NOSAVE, "print information regarding calculated smoothratio for interpolation")
CVARD(Bool, cl_legacyintrpl, false, CVAR_ARCHIVE, "perform legacy interpolation calculations")
CUSTOM_CVARD(Int, cl_crosshairscale, 50, CVAR_ARCHIVE, "changes the size of the crosshair")
{
if (self < 1) self = 1;

1
source/core/gamecvars.h
View file

@ -26,6 +26,7 @@ EXTERN_CVAR(Int, cl_crosshairscale)
EXTERN_CVAR(Bool, cl_sointerpolation)
EXTERN_CVAR(Bool, cl_syncinput)
EXTERN_CVAR(Bool, cl_debugintrpl)
EXTERN_CVAR(Bool, cl_legacyintrpl)
EXTERN_CVAR(Bool, demorec_seeds_cvar)
EXTERN_CVAR(Bool, demoplay_diffs)