Prepare CD code and unify header names

include/PSX/GPU/gpu.hpp

@@ -0,0 +1,41 @@
+#ifndef __JABYENGINE_GPU_HPP__
+#define __JABYENGINE_GPU_HPP__
+#include "../System/IOPorts/gpu_io.hpp"
+
+#if !defined(JABYENGINE_NTSC) && !defined(JABYENGINE_PAL)
+    #error "JABYENGINE_NTSC or JABYENGINE_PAL must be defined"
+#else
+    #if defined(JABYENGINE_NTSC) && defined(JABYENGINE_PAL)
+        #error "Please define only JABYENGINE_NTSC or JABYENGINE_PAL"
+    #endif
+#endif
+
+namespace GPU {
+    namespace Display {
+        #ifdef JABYENGINE_PAL
+            static constexpr size_t Width  = 320;
+            static constexpr size_t Height = 256;
+        #else
+            static constexpr size_t Width  = 320;
+            static constexpr size_t Height = 240;
+        #endif
+
+        static void enable() {
+            GP1.write(Command::GP1::SetDisplayState(DisplayState::On));
+        }
+
+        static void disable() {
+            GP1.write(Command::GP1::SetDisplayState(DisplayState::Off));
+        }
+    }
+
+    namespace Screen {
+        extern uint8_t CurrentDisplayAreaID;
+
+        namespace Range {
+            void set_offset(uint16_t x, uint16_t y);
+        }
+    }
+}
+
+#endif //!__JABYENGINE_GPU_HPP__