Add a better FPS limiter

source-code/source/plugins/Render/dllmain.cpp

@@ -7,6 +7,10 @@
 #include <windows.h>
 #include <iostream>
 
+#include <chrono>
+
+using namespace std::chrono;
+
 int hookedCreateWindow(const char* title, void(__cdecl* exit_function)(int))
 {
 	SetProcessDPIAware();
@@ -91,6 +95,21 @@ __int64 hookedParseParameters(int a1, __int64* a2)
 	return divaParseParameters(a1, a2);
 }
 
+time_point<high_resolution_clock> nextUpdate;
+microseconds expectedFrameDuration(1000000 / nFpsLimit);
+
+__int64 __fastcall hookedEngineUpdate(__int64 a1)
+{
+	if (high_resolution_clock::now() < nextUpdate)
+		return 0;
+
+	const auto result = divaEngineUpdate(a1);
+
+	nextUpdate = high_resolution_clock::now() + expectedFrameDuration;
+
+	return result;
+}
+
 
 BOOL APIENTRY DllMain(HMODULE hModule,
 	DWORD  ul_reason_for_call,
@@ -109,6 +128,14 @@ BOOL APIENTRY DllMain(HMODULE hModule,
 		DetourUpdateThread(GetCurrentThread());
 		DetourAttach(&(PVOID&)divaParseParameters, hookedParseParameters);
 		DetourTransactionCommit();
+
+		if (nFpsLimit > 0) 
+		{
+			DetourTransactionBegin();
+			DetourUpdateThread(GetCurrentThread());
+			DetourAttach(&(PVOID&)divaEngineUpdate, hookedEngineUpdate);
+			DetourTransactionCommit();
+		}
 	}
 	return TRUE;
 }

source-code/source/plugins/Render/framework.h

@@ -7,6 +7,7 @@
 
 static int(__cdecl* divaCreateWindow)(const char* title, void(__cdecl* exitfunc)(int)) = (int(__cdecl*)(const char* title, void(__cdecl * exitfunc)(int)))0x140194D00;
 __int64 (__fastcall* divaParseParameters)(int a1, __int64* a2) = (__int64(__fastcall*)(int a1, __int64* a2))0x140193630;
+__int64(__fastcall* divaEngineUpdate)(__int64 a1) = (__int64(__fastcall*)(__int64 a1))0x140194D20;
 
 uint8_t* fullScreenFlag = (uint8_t*)0x140EDA5D1;
 DWORD* resolutionType = (DWORD*)0x140EDA5D4;
@@ -34,6 +35,8 @@ int nIntResHeight = GetPrivateProfileIntW(L"resolution", L"r.height", 720, CONFI
 int nBitDepth = GetPrivateProfileIntW(L"resolution", L"bitdepth", 32, CONFIG_FILE);
 int nRefreshRate = GetPrivateProfileIntW(L"resolution", L"refreshrate", 60, CONFIG_FILE);
 
+int nFpsLimit = GetPrivateProfileIntW(L"graphics", L"fps.limit", 60, CONFIG_FILE);
+
 // used to trick Optimus into switching to the NVIDIA GPU
 HMODULE nvcudaModule = LoadLibraryW(L"nvcuda.dll");
 // cuInit actually returns a CUresult, but we don't really care about it