Add ability to skip POPCNT and SS(S)E 3 CPU extension tests

Experimental, but this should allow for running the game or dedicated server on a select few CPU's that appear to have SSSE 3, but not POPCNT. Still needs testing if it actually does work after emulating POPCNT instructions.

r5dev/core/dllmain.cpp

@@ -79,6 +79,15 @@ void SDK_Init()
 {
     Tier0_Init();
 
+    // Allow skipping this check, as the popcnt instruction can be emulated.
+    // this allows CPU's like the 'Intel Pentium E5400' to run the dedicated
+    // server still.
+    if (!CommandLine()->CheckParm("-nocputest"))
+    {
+        // Check CPU as early as possible; error out if CPU isn't supported.
+        CheckCPU();
+    }
+
     if (!CommandLine()->CheckParm("-launcher"))
     {
         CommandLine()->AppendParametersFromFile(SDK_DEFAULT_CFG);
@@ -147,7 +156,6 @@ void SDK_Shutdown()
 
 BOOL APIENTRY DllMain(HMODULE hModule, DWORD dwReason, LPVOID lpReserved)
 {
-    CheckCPU(); // Check CPU as early as possible; error out if CPU isn't supported.
     MathLib_Init(); // Initialize Mathlib.
 
     NOTE_UNUSED(lpReserved);

r5dev/launcher/launcher.cpp

@@ -12,6 +12,19 @@
 #include "launcher/launcher.h"
 #include <eiface.h>
 
+static void CheckCPU()
+{
+	// Allow skipping this check, as the popcnt instruction can be emulated.
+	// this allows CPU's like the 'Intel Pentium E5400' to run the dedicated
+	// server still.
+	if (!CommandLine()->CheckParm("-nocputest"))
+	{
+		// Run the game's implementation of CheckCPU
+		// for SSE 3, SSSE 3 and POPCNT.
+		v_CheckCPU();
+	}
+}
+
 int LauncherMain(HINSTANCE hInstance)
 {
 	// Flush buffers every 5 seconds for every logger.
@@ -81,6 +94,8 @@ LONG WINAPI TopLevelExceptionFilter(EXCEPTION_POINTERS* pExceptionPointers)
 
 void VLauncher::Attach(void) const
 {
+	DetourAttach((LPVOID*)&v_CheckCPU, &CheckCPU);
+
 	DetourAttach((LPVOID*)&v_LauncherMain, &LauncherMain);
 	DetourAttach((LPVOID*)&v_TopLevelExceptionFilter, &TopLevelExceptionFilter);
 #if !defined (GAMEDLL_S0) && !defined (GAMEDLL_S1)
@@ -89,6 +104,8 @@ void VLauncher::Attach(void) const
 }
 void VLauncher::Detach(void) const
 {
+	DetourDetach((LPVOID*)&v_CheckCPU, &CheckCPU);
+
 	DetourDetach((LPVOID*)&v_LauncherMain, &LauncherMain);
 	DetourDetach((LPVOID*)&v_TopLevelExceptionFilter, &TopLevelExceptionFilter);
 #if !defined (GAMEDLL_S0) && !defined (GAMEDLL_S1)

r5dev/launcher/launcher.h

@@ -1,6 +1,9 @@
 #ifndef LAUNCHER_H
 #define LAUNCHER_H
 
+inline CMemory p_CheckCPU;
+inline void(*v_CheckCPU)(void);
+
 inline CMemory p_LauncherMain;
 inline int(*v_LauncherMain)(HINSTANCE hInstance);
 
@@ -19,6 +22,7 @@ class VLauncher : public IDetour
 {
 	virtual void GetAdr(void) const
 	{
+		LogFunAdr("CheckCPU", p_CheckCPU.GetPtr());
 		LogFunAdr("LauncherMain", p_LauncherMain.GetPtr());
 		LogFunAdr("TopLevelExceptionFilter", p_TopLevelExceptionFilter.GetPtr());
 #if !defined (GAMEDLL_S0) && !defined (GAMEDLL_S1)
@@ -27,6 +31,9 @@ class VLauncher : public IDetour
 	}
 	virtual void GetFun(void) const
 	{
+		p_CheckCPU = g_GameDll.FindPatternSIMD("40 53 48 81 EC ?? ?? ?? ?? 33 C9");
+		v_CheckCPU = p_CheckCPU.RCast<void(*)(void)>();
+
 		p_LauncherMain = g_GameDll.FindPatternSIMD("E8 ?? ?? ?? ?? 8B C8 E8 ?? ?? ?? ?? CC").FollowNearCallSelf();
 		v_LauncherMain = p_LauncherMain.RCast<int(*)(HINSTANCE)>();