implement class hooks

ISLE/isleapp.cpp

@@ -156,14 +156,20 @@ BOOL StartDirectSound(void);
 int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd)
 {
 #ifdef ISLE_BUILD_PATCH
-  // Load LEGO1_PATCH.DLL
   {
-    HMODULE hModule = LoadLibraryA("LEGO1_PATCH.DLL");
-    if (hModule) {
+    // Find the imported LEGO1.DLL module
+    HMODULE hLego1Module = GetModuleHandleA("LEGO1.DLL");
+    if (!hLego1Module) {
+      return 1;
+    }
+
+    // Load LEGO1_PATCH.DLL
+    HMODULE hPatchModule = LoadLibraryA("LEGO1_PATCH.DLL");
+    if (hPatchModule) {
       typedef void (*PatchFunc)(void*);
-      PatchFunc patchFunc = (PatchFunc)GetProcAddress(hModule, "Patch");
+      PatchFunc patchFunc = (PatchFunc)GetProcAddress(hPatchModule, "Patch");
       if (patchFunc) {
-        void *root = (char*)VideoManager - 0x10015720;
+        void *root = (char*)hLego1Module - 0x10000000;
         patchFunc(root);
       }
     }

LEGO1/decomp.cpp

@@ -58,32 +58,11 @@ static class DecompPatchList
       BYTE *location = (BYTE*)((DWORD)root + (DWORD)node->origFunc);
       BYTE *newFunction = (BYTE*)node->newFunc;
 
-      /*
       DWORD dwOldProtection;
       VirtualProtect(location, 5, PAGE_EXECUTE_READWRITE, &dwOldProtection);
       location[0] = 0xE9; //jmp
       *((DWORD*)(location + 1)) = (DWORD)(((DWORD)newFunction - (DWORD)location) - 5);
       VirtualProtect(location, 5, dwOldProtection, &dwOldProtection);
-      */
-
-      BYTE code[5];
-      code[0] = 0xE9; //jmp
-      *((DWORD*)(code + 1)) = (DWORD)(((DWORD)newFunction - (DWORD)location) - 5);
-
-      char buffer[256];
-      sprintf(buffer, "location %p, newFunction %p, origFunc %p, root %p", location, newFunction, node->origFunc, root);
-      MessageBoxA(NULL, buffer, "DecompPatchList", MB_ICONERROR);
-
-      static HANDLE hProcess = GetCurrentProcess();
-      DWORD written = 0;
-      if (WriteProcessMemory(hProcess, location, code, sizeof(code), &written) == FALSE || written != sizeof(code))
-      {
-        // Print error reason
-        sprintf(buffer, "WriteProcessMemory failed: %d", GetLastError());
-        MessageBoxA(NULL, buffer, "DecompPatchList", MB_ICONERROR);
-
-        MessageBoxA(NULL, "Patch failed", "DecompPatchList", MB_ICONERROR);
-      }
     }
   }
 } decompPatchList;

LEGO1/decomp.h

@@ -14,26 +14,32 @@ typedef unsigned int undefined4;
 
 #ifdef ISLE_BUILD_PATCH
 
+// Function called to add a patch to the list of patches
 void DecompPatchAdd(void *origFunc, void *newFunc);
 
-#define DECOMP_METHOD_HOOK(origFunc, cls, method, retv, args) \
-namespace _DecompPatchHook_##__COUNTER__ \
-{ \
-  class DecompPatchHook \
+// Class decomp hook macros
+#define DECOMP_HOOK_DECL_CLS() \
+  static void _ExportHooks()
+
+#define DECOMP_HOOK_START_CLS(cls) \
+  void cls::_ExportHooks() {
+#define DECOMP_HOOK_END_CLS(cls) \
+  } static struct _ExportHooks_##cls { _ExportHooks_##cls () { cls::_ExportHooks(); } } _exportHooks_##cls
+
+#define DECOMP_HOOK_EXPORT_CLS(origFunc, cls, retv, method, args) \
   { \
-  public: \
-    DecompPatchHook() \
-    { \
-      retv(cls :: *method) args = cls::method; \
-      DecompPatchAdd((void*)origFunc, (void*)&_patchHook); \
-    } \
-  } _patchHook; \
-}
+    retv(cls :: * _ourFunc ) args = cls::method; \
+    DecompPatchAdd((void*)origFunc, (void*)*((DWORD*)& _ourFunc )); \
+  }
 
 #else
 
 #define DECOMP_METHOD_HOOK()
 
+#define DECOMP_HOOK_DECL_EXPORT()
+#define DECOMP_HOOK_DEFN_EXPORT()
+#define DECOMP_HOOK_EXPORT()
+
 #endif
 
 #endif // DECOMP_H

LEGO1/mxtransitionmanager.cpp

@@ -4,6 +4,10 @@
 
 DECOMP_SIZE_ASSERT(MxTransitionManager, 0x900);
 
+DECOMP_HOOK_START_CLS(MxTransitionManager);
+DECOMP_HOOK_EXPORT_CLS(0x1004bb70, MxTransitionManager, void, SubmitCopyRect, (DDSURFACEDESC&));
+DECOMP_HOOK_END_CLS(MxTransitionManager);
+
 // 0x100f4378
 RECT g_fullScreenRect = {0, 0, 640, 480};
 
@@ -153,7 +157,6 @@ MxResult MxTransitionManager::GetDDrawSurfaceFromVideoManager() // vtable+0x14
 MxResult MxTransitionManager::StartTransition(TransitionType p_animationType, MxS32 p_speed,
                                               MxBool p_doCopy, MxBool p_playMusicInAnim)
 {
-  Beep(750, 300);
   if (this->m_transitionType == NOT_TRANSITIONING) {
     if (!p_playMusicInAnim) {
       MxBackgroundAudioManager *backgroundAudioManager = BackgroundAudioManager();
@@ -193,8 +196,6 @@ MxResult MxTransitionManager::StartTransition(TransitionType p_animationType, Mx
   return FAILURE;
 }
 
-DECOMP_METHOD_HOOK(0x1004bb70, MxTransitionManager, StartTransition, MxResult, (MxTransitionManager::TransitionType, MxS32, MxBool, MxBool));
-
 // OFFSET: LEGO1 0x1004c170
 void MxTransitionManager::Transition_Wipe()
 {
@@ -253,7 +254,7 @@ void MxTransitionManager::SubmitCopyRect(DDSURFACEDESC &ddsc)
 
   DWORD bytesPerPixel = ddsc.ddpfPixelFormat.dwRGBBitCount / 8;
 
-  const char *src = (const char *)m_copyBuffer;
+  const char *src = (const char*)m_copyBuffer;
 
   LONG copyPitch;
   copyPitch = ((m_copyRect.right - m_copyRect.left) + 1) * bytesPerPixel;

LEGO1/mxtransitionmanager.h

@@ -9,6 +9,8 @@
 class MxTransitionManager : public MxCore
 {
 public:
+  DECOMP_HOOK_DECL_CLS();
+
   MxTransitionManager();
   virtual ~MxTransitionManager() override; // vtable+0x0