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Significantly reduce CPU time in CEngine::Frame for dedicated

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Significant reduction of CPU time in CEngine::Frame for the dedicated server, by assigning the ConVar 'fps_max' to the tickrate of the server.
This commit is contained in:
Kawe Mazidjatari 2023-04-10 22:35:41 +02:00
parent b45055dafd
commit f37743e068
2 changed files with 58 additions and 5 deletions

38
r5dev/engine/sys_engine.cpp

@ -1,9 +1,35 @@
#include "core/stdafx.h"
#include "tier1/cvar.h"
#include "sys_engine.h"
#ifdef DEDICATED
#include "game/shared/shareddefs.h"
#endif // DEDICATED
///////////////////////////////////////////////////////////////////////////////
CEngine* g_pEngine = nullptr;
bool CEngine::_Frame(CEngine* thisp)
{
#ifdef DEDICATED
// The first engine frame is ran before the global variables are initialized.
// By default, the tick interval is set to '0.0f'; we can't divide by zero.
if (TICK_INTERVAL > 0.0f)
{
int nTickRate = TIME_TO_TICKS(1.0f);
if (fps_max->GetInt() != nTickRate)
{
// Clamp the framerate of the server to its simulation tick rate.
// This saves a significant amount of CPU time in CEngine::Frame,
// as the engine uses this to decided when to run a new frame.
fps_max->SetValue(nTickRate);
}
}
#endif // DEDICATED
return v_CEngine_Frame(thisp);
}
/*
//-----------------------------------------------------------------------------
// Purpose: Start initializing the engine.
@ -82,4 +108,14 @@ void CEngine::SetQuitting(EngineDllQuitting_t quitDllState)
const static int index = 9;
CallVFunc<void>(index, this, quitDllState);
}
*/
*/
void VEngine::Attach() const
{
DetourAttach((LPVOID*)&v_CEngine_Frame, &CEngine::_Frame);
}
void VEngine::Detach() const
{
DetourDetach((LPVOID*)&v_CEngine_Frame, &CEngine::_Frame);
}

25
r5dev/engine/sys_engine.h

@ -4,6 +4,9 @@
class CEngine : public IEngine
{
public:
static bool _Frame(CEngine* thisp);
private:
EngineState_t m_nDLLState;
EngineState_t m_nNextDLLState;
@ -19,6 +22,9 @@ private:
};
/* ==== CENGINE ======================================================================================================================================================= */
inline CMemory p_CEngine_Frame;
inline auto v_CEngine_Frame = p_CEngine_Frame.RCast<bool(*)(CEngine* thisp)>();
extern CEngine* g_pEngine;
///////////////////////////////////////////////////////////////////////////////
@ -30,9 +36,20 @@ class VEngine : public IDetour
{
virtual void GetAdr(void) const
{
LogVarAdr("g_pEngine", reinterpret_cast<uintptr_t>(g_pEngine));
LogFunAdr("CEngine::Frame", p_CEngine_Frame.GetPtr());
LogVarAdr("g_Engine", reinterpret_cast<uintptr_t>(g_pEngine));
}
virtual void GetFun(void) const
{
#if defined (GAMEDLL_S0) || defined (GAMEDLL_S1) || defined (GAMEDLL_S2)
p_CEngine_Frame = g_GameDll.FindPatternSIMD("40 55 53 56 48 8D AC 24 ?? ?? ?? ?? 48 81 EC ?? ?? ?? ?? 48 8B 05 ?? ?? ?? ?? 48 8B F1");
#elif defined (GAMEDLL_S2)
p_CEngine_Frame = g_GameDll.FindPatternSIMD("48 8B C4 56 48 81 EC ?? ?? ?? ?? 0F 29 70 B8");
#else
p_CEngine_Frame = g_GameDll.FindPatternSIMD("48 8B C4 55 56 48 8D A8 ?? ?? ?? ?? 48 81 EC ?? ?? ?? ?? 0F 29 70 B8");
#endif
v_CEngine_Frame = p_CEngine_Frame.RCast<bool(*)(CEngine* thisp)>();
}
virtual void GetFun(void) const { }
virtual void GetVar(void) const
{
#if defined (GAMEDLL_S0) || defined (GAMEDLL_S1)
@ -42,7 +59,7 @@ class VEngine : public IDetour
#endif
}
virtual void GetCon(void) const { }
virtual void Attach(void) const { }
virtual void Detach(void) const { }
virtual void Attach(void) const;
virtual void Detach(void) const;
};
///////////////////////////////////////////////////////////////////////////////