Implements calling Lua.

src/common.h

@@ -0,0 +1,35 @@
+#pragma once
+
+#include <codecvt>
+#include <cstdlib>
+#include <sstream>
+#include <string>
+
+#define NOMINMAX
+#include <windows.h>
+#undef NOMINMAX
+
+#include "thirdparty/linalg.h"
+
+namespace gj {
+
+
+using mat3 = ::linalg::mat<double, 3, 3>;
+using vec3 = ::linalg::vec<double, 3>;
+
+
+static inline std::wstring ConvertUtf8ToUtf16(const std::string& str) {
+  std::wostringstream conv;
+  conv << str.c_str();
+  return conv.str();
+}
+
+
+[[noreturn]]
+static inline void Abort(const std::string& msg) {
+  MessageBox(NULL, ConvertUtf8ToUtf16(msg).c_str(), L"PROGRAM ABORTED", MB_OK);
+  std::exit(1);
+}
+
+
+}