Introduce the JabyEngine namespace to all files

include/PSX/jabyengine.hpp

@@ -0,0 +1,36 @@
+#ifndef __JABYENGINE__HPP__
+#define __JABYENGINE__HPP__
+#include "../stdint.h"
+
+namespace JabyEngine {
+    struct NextRoutine {
+        static constexpr uintptr_t OverlayBit = (1 << ((sizeof(uintptr_t)*8) - 2));
+        typedef NextRoutine (*MainRoutine)();
+
+        uintptr_t value;
+
+        constexpr static NextRoutine null() {
+            return {.value = 0};
+        }
+
+        static NextRoutine from(MainRoutine function) {
+            return {.value = reinterpret_cast<uintptr_t>(function)};
+        }
+
+        constexpr bool is_overlay() const {
+            return (this->value & OverlayBit);
+        }
+
+        constexpr bool is_absolute() const {
+            return !NextRoutine::is_overlay();
+        }
+
+        constexpr bool is_null() const {
+            return this->value == 0;
+        }
+    };
+
+    typedef NextRoutine::MainRoutine MainRoutine;
+}
+
+#endif //!__JABYENGINE__HPP__