port: very experimental uncapped framerate support

set Game.TickRateDivisor in pd.ini to 0

this still has many issues, such as combat boost not working

port/src/main.c

@@ -35,6 +35,8 @@ u32 g_VmNumPageMisses = 0;
 u32 g_VmNumPageReplaces = 0;
 u8 g_VmShowStats = 0;
 
+s32 g_TickRateDiv = 1;
+
 extern s32 g_StageNum;
 
 s32 bootGetMemSize(void)
@@ -135,6 +137,7 @@ PD_CONSTRUCTOR static void gameConfigInit(void)
 	configRegisterInt("Game.MemorySize", &g_OsMemSizeMb, 4, 2048);
 	configRegisterInt("Game.CenterHUD", &g_HudCenter, 0, 1);
 	configRegisterFloat("Game.ScreenShakeIntensity", &g_ViShakeIntensityMult, 0.f, 10.f);
+	configRegisterInt("Game.TickRateDivisor", &g_TickRateDiv, 0, 10);
 	for (s32 j = 0; j < MAX_PLAYERS; ++j) {
 		const s32 i = j + 1;
 		configRegisterFloat(strFmt("Game.Player%d.FovY", i), &g_PlayerExtCfg[j].fovy, 5.f, 175.f);

port/src/pdmain.c

@@ -494,7 +494,7 @@ void mainLoop(void)
 
 		while (g_MainChangeToStageNum < 0) {
 			const s32 cycles = osGetCount() - g_Vars.thisframestartt;
-			if (cycles >= g_Vars.mininc60 * CYCLES_PER_FRAME - CYCLES_PER_FRAME / 2) {
+			if (!g_Vars.mininc60 || (cycles >= g_Vars.mininc60 * CYCLES_PER_FRAME - CYCLES_PER_FRAME / 2)) {
 				schedStartFrame(&g_Sched);
 				mainTick();
 				schedEndFrame(&g_Sched);

src/game/timing.c

@@ -41,12 +41,16 @@ void frametimeCalculate(void)
 
 		diffframe60 = (g_Vars.lostframetime60t + diffframet + CYCLES_PER_FRAME / 2) / CYCLES_PER_FRAME;
 		diffframe240 = (g_Vars.lostframetime240t + diffframet + CYCLES_PER_FRAME / 2 / 4) / (CYCLES_PER_FRAME / 4);
-	} while (diffframe60 < g_Vars.mininc60);
+	} while (g_Vars.mininc60 && diffframe60 < g_Vars.mininc60);
 
 	g_Vars.lostframetime60t = g_Vars.lostframetime60t + diffframet - diffframe60 * CYCLES_PER_FRAME;
 	g_Vars.lostframetime240t = g_Vars.lostframetime240t + diffframet - diffframe240 * (CYCLES_PER_FRAME / 4);
 
+#ifdef PLATFORM_N64
 	g_Vars.mininc60 = 1;
+#else
+	g_Vars.mininc60 = g_TickRateDiv;
+#endif
 
 	frametimeApply(diffframe60, diffframe240, count);
 }

src/include/data.h

@@ -545,6 +545,7 @@ extern u32 g_HudAlignModeR;
 extern s32 g_PrevFrameFb;
 extern s32 g_BlurFb;
 extern s32 g_BlurFbCapTimer;
+extern s32 g_TickRateDiv;
 
 #define PLAYER_EXTCFG() g_PlayerExtCfg[g_Vars.currentplayerstats->mpindex & 3]
 #define PLAYER_DEFAULT_FOV (PLAYER_EXTCFG().fovy)

src/lib/varsinit.c

@@ -28,7 +28,11 @@ void varsInit(void)
 	g_Vars.lostframetime60t = 0;
 	g_Vars.lostframetime240t = 0;
 	g_Vars.lvupdate240rem = 2;
+#ifdef PLATFORM_N64
 	g_Vars.mininc60 = 1;
+#else
+	g_Vars.mininc60 = g_TickRateDiv;
+#endif
 	g_Vars.roomportalrecursionlimit = 254;
 	g_Vars.diffframe240f = 4;
 	g_Vars.diffframe240freal = 4;