embed OpenRCT2 icon for Windows (#3372)

Embeds the OpenRCT2 icon file using Win32 native resources and sets the window icon to it.

src/platform/platform.h

@@ -156,6 +156,7 @@ void platform_enumerate_files_end(int handle);
 int platform_enumerate_directories_begin(const utf8 *directory);
 bool platform_enumerate_directories_next(int handle, utf8 *path);
 void platform_enumerate_directories_end(int handle);
+void platform_init_window_icon();
 
 // Returns the bitmask of the GetLogicalDrives function for windows, 0 for other systems
 int platform_get_drives();

src/platform/posix.c

@@ -892,4 +892,10 @@ utf8* platform_get_username() {
 	}
 }
 
+void platform_init_window_icon()
+{
+	// TODO Create a surface with the window icon
+	// SDL_SetWindowIcon(gWindow, iconSurface)
+}
+
 #endif

src/platform/shared.c

@@ -775,6 +775,7 @@ static void platform_create_window()
 
 	SDL_SetWindowGrab(gWindow, gConfigGeneral.trap_cursor ? SDL_TRUE : SDL_FALSE);
 	SDL_SetWindowMinimumSize(gWindow, 720, 480);
+	platform_init_window_icon();
 
 	// Set the update palette function pointer
 	RCT2_GLOBAL(0x009E2BE4, update_palette_func) = platform_update_palette;

src/platform/windows.c

@@ -35,6 +35,9 @@
 #include "../config.h"
 #include "platform.h"
 
+// Native resource IDs
+#include "../../resources/resource.h"
+
 // The name of the mutex used to prevent multiple instances of the game from running
 #define SINGLE_INSTANCE_MUTEX_NAME "RollerCoaster Tycoon 2_GSKMUTEX"
 
@@ -43,6 +46,10 @@ utf8 _openrctDataDirectoryPath[MAX_PATH] = { 0 };
 
 utf8 **windows_get_command_line_args(int *outNumArgs);
 
+#define OPENRCT2_DLL_MODULE_NAME "openrct2.dll"
+
+static HMODULE _dllModule = NULL;
+
 /**
  * Windows entry point to OpenRCT2 without a console window.
  */
@@ -69,6 +76,7 @@ utf8 **windows_get_command_line_args(int *outNumArgs);
  */
 BOOL APIENTRY DllMain(HANDLE hModule, DWORD dwReason, LPVOID lpReserved)
 {
+	_dllModule = hModule;
 	return TRUE;
 }
 #endif // __MINGW32__
@@ -82,6 +90,10 @@ __declspec(dllexport) int StartOpenRCT(HINSTANCE hInstance, HINSTANCE hPrevInsta
 	int argc, runGame;
 	char **argv;
 
+	if (_dllModule == NULL) {
+		_dllModule = GetModuleHandleA(OPENRCT2_DLL_MODULE_NAME);
+	}
+
 	RCT2_GLOBAL(RCT2_ADDRESS_HINSTANCE, HINSTANCE) = hInstance;
 	RCT2_GLOBAL(RCT2_ADDRESS_CMDLINE, LPSTR) = lpCmdLine;
 
@@ -798,6 +810,17 @@ HWND windows_get_window_handle()
 	return result;
 }
 
+void platform_init_window_icon()
+{
+	if (_dllModule != NULL) {
+		HICON icon = LoadIcon(_dllModule, MAKEINTRESOURCE(IDI_ICON));
+		if (icon != NULL) {
+			HWND hwnd = windows_get_window_handle();
+			SendMessage(hwnd, WM_SETICON, ICON_SMALL, (LPARAM)icon);
+		}
+	}
+}
+
 uint16 platform_get_locale_language()
 {
 	CHAR langCode[4];