Windows: Always use WinMain for UTF8 command line arguments;

This fixes problems with paths containing special characters on windows.

CMakeLists.txt

@@ -555,8 +555,8 @@ if(WIN32)
   target_sources(lovr PRIVATE src/core/os_win32.c)
   target_sources(lovr PRIVATE src/resources/lovr.rc)
   set_target_properties(lovr PROPERTIES COMPILE_FLAGS "/wd4244 /MP")
-  set_target_properties(lovr PROPERTIES LINK_FLAGS_DEBUG "/SUBSYSTEM:CONSOLE")
-  set_target_properties(lovr PROPERTIES LINK_FLAGS_RELEASE "/SUBSYSTEM:windows /ENTRY:mainCRTStartup")
+  set_target_properties(lovr PROPERTIES LINK_FLAGS_DEBUG "/SUBSYSTEM:console /ENTRY:WinMainCRTStartup")
+  set_target_properties(lovr PROPERTIES LINK_FLAGS_RELEASE "/SUBSYSTEM:windows /ENTRY:WinMainCRTStartup")
   target_compile_definitions(lovr PRIVATE _CRT_SECURE_NO_WARNINGS)
   target_compile_definitions(lovr PRIVATE _CRT_NONSTDC_NO_WARNINGS)
 

src/core/os_win32.c

@@ -1,6 +1,7 @@
 #include "os.h"
 #define WIN32_LEAN_AND_MEAN
 #include <windows.h>
+#include <shellapi.h>
 #include <KnownFolders.h>
 #include <ShlObj.h>
 #include <stdio.h>
@@ -9,6 +10,45 @@
 
 static uint64_t frequency;
 
+int main(int argc, char** argv);
+
+int WINAPI WinMain(HINSTANCE instance, HINSTANCE prev, LPSTR args, int show) {
+  int argc;
+  char** argv;
+
+  LPWSTR* wargv = CommandLineToArgvW(GetCommandLineW(), &argc);
+  if (!wargv) {
+    return EXIT_FAILURE;
+  }
+
+  argv = calloc(argc + 1, sizeof(char*));
+  if (!argv) {
+    return EXIT_FAILURE;
+  }
+
+  for (int i = 0; i < argc; i++) {
+    int size = WideCharToMultiByte(CP_UTF8, 0, wargv[i], -1, NULL, 0, NULL, NULL);
+
+    argv[i] = malloc(size);
+    if (!argv[i]) {
+      return EXIT_FAILURE;
+    }
+
+    if (!WideCharToMultiByte(CP_UTF8, 0, wargv[i], -1, argv[i], size, NULL, NULL)) {
+      return EXIT_FAILURE;
+    }
+  }
+
+  int status = main(argc, argv);
+
+  for (int i = 0; i < argc; i++) {
+    free(argv[i]);
+  }
+  free(argv);
+
+  return status;
+}
+
 bool os_init() {
   LARGE_INTEGER f;
   QueryPerformanceFrequency(&f);