Merge pull request #388 from spelunky-fyi/steam-overlay

Fix steam overlay hook patterns

src/game_api/window_api.cpp

@@ -402,8 +402,8 @@ void hook_steam_overlay()
     // Lets detour the steam overlay instead!
     DEBUG("Steam detected, hooking Steam Overlay...");
 
-    size_t present_offset = find_inst(steam_overlay, "\x48\x89\x74\x24\x20\x41\x56\x48\x83\xEC\x20\x41\x8B\xE8\x8B\xF2"sv, 0, 0x99999, "steam_overlay_present"sv);
-    size_t resize_offset = find_inst(steam_overlay, "\x48\x89\x6C\x24\x10\x48\x89\x74\x24\x18\x57\x41\x56\x41\x57\x48\x83\xEC\x30\x44\x8B\xFA\x48\x8B\xF1\x48\x8B\xD1\x41\x8B\xE9"sv, 0, 0x99999, "steam_overlay_resize"sv);
+    size_t present_offset = find_inst(steam_overlay, "\x48\x8b\x4f\x40\x48\x8d\x15"sv, 0, 0x99999, "steam_overlay_present"sv, false);
+    size_t resize_offset = find_inst(steam_overlay, "\x48\x8b\x4f\x68\x48\x8d\x15"sv, 0, 0x99999, "steam_overlay_resize"sv, false);
 
     if (present_offset == 0 || resize_offset == 0)
     {
@@ -416,8 +416,13 @@ void hook_steam_overlay()
         return;
     }
 
-    g_OrigSwapChainPresent = (PresentPtr)(steam_overlay + present_offset - 5);
-    g_OrigSwapChainResizeBuffers = (ResizeBuffersPtr)(steam_overlay + resize_offset - 5);
+    auto present_offset2 = *(int*)(steam_overlay + present_offset + 7);
+    auto resize_offset2 = *(int*)(steam_overlay + resize_offset + 7);
+    present_offset = present_offset + 7 + 4 + present_offset2;
+    resize_offset = resize_offset + 7 + 4 + resize_offset2;
+
+    g_OrigSwapChainPresent = (PresentPtr)(steam_overlay + present_offset);
+    g_OrigSwapChainResizeBuffers = (ResizeBuffersPtr)(steam_overlay + resize_offset);
 
     DetourTransactionBegin();
     DetourUpdateThread(GetCurrentThread());