Improve CS2 support and S2 game detection

AMBuildScript

@@ -78,7 +78,7 @@ PossibleSDKs = {
   'mock': SDK('HL2SDK-MOCK', '2.mock', '999', 'MOCK', Mock, 'mock'),
   'pvkii': SDK('HL2SDKPVKII', '2.pvkii', '10', 'PVKII', WinLinux, 'pvkii'),
   'dota': SDK('HL2SDKDOTA', '2.dota', '24', 'DOTA', Source2, 'dota'),
-  'cs2': SDK('HL2SDKCS2', '2.cs2', '25', 'CS2', [], 'cs2'),
+  'cs2': SDK('HL2SDKCS2', '2.cs2', '25', 'CS2', Source2, 'cs2'),
 }
 
 def ResolveEnvPath(env, folder):
@@ -391,7 +391,7 @@ class MMSConfig(object):
     if compiler.target.arch == 'x86_64':
       compiler.defines += ['X64BITS', 'PLATFORM_64BITS']
 
-    if sdk.name in ['css', 'hl2dm', 'dods', 'sdk2013', 'bms', 'tf2', 'l4d', 'nucleardawn', 'l4d2', 'dota', 'pvkii']:
+    if sdk.name in ['css', 'hl2dm', 'dods', 'sdk2013', 'bms', 'tf2', 'l4d', 'nucleardawn', 'l4d2', 'dota', 'cs2', 'pvkii']:
       if compiler.target.platform in ['linux', 'mac']:
         compiler.defines += ['NO_HOOK_MALLOC', 'NO_MALLOC_OVERRIDE']
 
@@ -475,7 +475,7 @@ class MMSConfig(object):
         compiler.linkflags += ['-Wl,-z,origin']
       compiler.postlink += [tier1]
 
-      if sdk.name in ['blade', 'insurgency', 'doi', 'csgo', 'dota']:
+      if sdk.name in ['blade', 'insurgency', 'doi', 'csgo', 'cs2', 'dota']:
         if compiler.target.arch == 'x86_64':
           compiler.postlink += [os.path.join(lib_folder, 'interfaces.a')]
         else:
@@ -494,7 +494,7 @@ class MMSConfig(object):
         dynamic_libs = ['libtier0_srv.so', 'libvstdlib_srv.so']
       elif compiler.target.arch == 'x86_64' and sdk.name in ['csgo', 'mock']:
         dynamic_libs = ['libtier0_client.so', 'libvstdlib_client.so']
-      elif sdk.name in ['l4d', 'blade', 'insurgency', 'doi', 'csgo', 'dota', 'pvkii']:
+      elif sdk.name in ['l4d', 'blade', 'insurgency', 'doi', 'csgo', 'cs2', 'dota', 'pvkii']:
         dynamic_libs = ['libtier0.so']
         if sdk.name not in ['dota', 'cs2']:
           dynamic_libs += ['libvstdlib.so']
@@ -509,7 +509,7 @@ class MMSConfig(object):
       libs = ['tier0', 'tier1']
       if sdk.name not in ['dota', 'cs2']:
         libs += ['vstdlib']
-      if sdk.name in ['swarm', 'blade', 'insurgency', 'doi', 'mcv', 'csgo', 'dota']:
+      if sdk.name in ['swarm', 'blade', 'insurgency', 'doi', 'mcv', 'csgo', 'cs2', 'dota']:
         libs.append('interfaces')
       if sdk.name == 'bms':
         libs.append('mathlib')

core/provider/source2/provider_source2.cpp

@@ -215,7 +215,9 @@ const char* Source2Provider::GetEngineDescription() const
 
 void Source2Provider::GetGamePath(char* pszBuffer, int len)
 {
-	ke::SafeSprintf(pszBuffer, len, "%s", Plat_GetGameDirectory());
+	CBufferStringGrowable<MAX_PATH> buf;
+	engine->GetGameDir(buf);
+	ke::SafeSprintf(pszBuffer, len, "%s", buf.Get());
 }
 
 const char* Source2Provider::GetGameDescription()

loader/gamedll.cpp

@@ -327,8 +327,15 @@ public:
 	virtual void *QueryInterface(const char *pInterfaceName) { return nullptr; }
 
 	virtual InitReturnVal_t Init()
+	{
+		if (!stricmp("csgo", game_name))
+		{
+			mm_backend = MMBackend_CS2;
+		}
+		else
 		{
 			mm_backend = MMBackend_DOTA;
+		}
 
 		char error[255];
 		if (!mm_LoadMetamodLibrary(mm_backend, error, sizeof(error)))
@@ -454,7 +461,7 @@ public:
 						 QueryValveInterface fileSystemFactory, 
 						 void *pGlobals)
 	{
-		mm_backend = mm_DetermineBackend(engineFactory, gamedll_qvi, game_name);
+		mm_backend = mm_DetermineBackendS1(engineFactory, gamedll_qvi, game_name);
 
 		char error[255];
 		if (mm_backend == MMBackend_UNKNOWN)

loader/loader.cpp

@@ -2,7 +2,7 @@
  * vim: set ts=4 sw=4 tw=99 noet :
  * ======================================================
  * Metamod:Source
- * Copyright (C) 2004-2015 AlliedModders LLC and authors.
+ * Copyright (C) 2004-2023 AlliedModders LLC and authors.
  * All rights reserved.
  * ======================================================
  *
@@ -29,6 +29,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <cstdint>
 #include "loader.h"
 #include "serverplugin.h"
 #include "gamedll.h"
@@ -93,7 +94,8 @@ static const char *backend_names[] =
 	"2.doi",
 	"2.mock",
 	"2.pvkii",
-	"2.mcv"
+	"2.mcv",
+	"2.cs2",
 };
 
 #if defined _WIN32
@@ -198,6 +200,8 @@ mm_GetProcAddress(const char *name)
 	return mm_GetLibAddress(mm_library, name);
 }
 
+typedef const char *(*GetGameInfoStringFn)(const char *pszKeyName, const char *pszDefaultValue, char *pszOut, uint64_t cbOut);
+
 void
 mm_GetGameName(char *buffer, size_t size)
 {
@@ -283,24 +287,44 @@ mm_GetGameName(char *buffer, size_t size)
 
 	if (buffer[0] == 0)
 	{
-		// HackHackHack - Different engines have different defaults if -game isn't specified
+		char tier0_path[PLATFORM_MAX_PATH];
-		// we only use this for game detection, and not even in all cases. Old behavior was to 
+#ifdef _WIN32
-		// give back ".", which was only really accurate for Dark Messiah. We'll add a special 
+		if (mm_ResolvePath("tier0.dll", tier0_path, sizeof(tier0_path), false))
-		// case for Source2 / Dota as well, since it only supports gameinfo loading, which relies
+#elif defined __linux__
-		// on accuracy here more than VSP loading.
+		if (mm_ResolvePath("libtier0.so", tier0_path, sizeof(tier0_path), false))
-		if (bHasDedicated)
+#elif defined __APPLE__
+		if (mm_ResolvePath("libtier0.dylib", tier0_path, sizeof(tier0_path), false))#else
+#error unsupported platform
+#endif
 		{
-			strncpy(buffer, "dota", size);
+			char err[1024];
+			void* pTier0 = mm_LoadLibrary(tier0_path, err, sizeof(err));
+			if (pTier0)
+			{
+#ifdef _WIN32
+				GetGameInfoStringFn func = (GetGameInfoStringFn)mm_GetLibAddress(pTier0, "?GetGameInfoString@@YAPEBDPEBD0PEAD_K@Z");
+#else
+				GetGameInfoStringFn func = (GetGameInfoStringFn)mm_GetLibAddress(pTier0, "__Z17GetGameInfoStringPKcS0_Pcm");
+#endif
+				if (func != nullptr)
+				{
+					static char szTmp[260];
+					strncpy(buffer, func("FileSystem/SearchPaths/Mod", "", szTmp, sizeof(szTmp)), size);
 				}
-		else
+
+				mm_UnloadLibrary(pTier0);
+			}
+		}
+	}
+
+	if (buffer[0] == 0)
 	{
 		strncpy(buffer, ".", size);
 	}
-	}
 }
 
 MetamodBackend
-mm_DetermineBackend(QueryValveInterface engineFactory, QueryValveInterface serverFactory, const char *game_name)
+mm_DetermineBackendS1(QueryValveInterface engineFactory, QueryValveInterface serverFactory, const char *game_name)
 {
 	if (engineFactory("VEngineServer023", NULL) != NULL)
 	{

loader/loader.h

@@ -2,7 +2,7 @@
  * vim: set ts=4 sw=4 tw=99 noet :
  * ======================================================
  * Metamod:Source
- * Copyright (C) 2004-2015 AlliedModders LLC and authors.
+ * Copyright (C) 2004-2023 AlliedModders LLC and authors.
  * All rights reserved.
  * ======================================================
  *
@@ -106,6 +106,7 @@ enum MetamodBackend
 	MMBackend_Mock,
 	MMBackend_PVKII,
 	MMBackend_MCV,
+	MMBackend_CS2,
 	MMBackend_UNKNOWN
 };
 
@@ -125,7 +126,7 @@ extern void
 mm_GetGameName(char *buffer, size_t size);
 
 extern MetamodBackend
-mm_DetermineBackend(QueryValveInterface engineFactory, QueryValveInterface serverFactory, const char *game_name);
+mm_DetermineBackendS1(QueryValveInterface engineFactory, QueryValveInterface serverFactory, const char *game_name);
 
 extern MetamodBackend mm_backend;
 

loader/serverplugin.cpp

@@ -90,7 +90,7 @@ public:
 		{
 			mm_GetGameName(game_name, sizeof(game_name));
 
-			mm_backend = mm_DetermineBackend(engineFactory, gsFactory, game_name);
+			mm_backend = mm_DetermineBackendS1(engineFactory, gsFactory, game_name);
 			if (mm_backend == MMBackend_Mock)
 				strcpy(game_name, "mock");
 		}
@@ -139,8 +139,7 @@ public:
 			&& mm_backend != MMBackend_Insurgency
 			&& mm_backend != MMBackend_DOI
 			&& mm_backend != MMBackend_CSGO
-			&& mm_backend != MMBackend_MCV
+			&& mm_backend != MMBackend_MCV)
-			&& mm_backend != MMBackend_DOTA)
 		{
 			SourceHook::MemFuncInfo mfp_fconnect;
 			mfp_fconnect.isVirtual = false;