Remove Overlayhader and support loading overlays

include/PSX/File/cd_file_types.hpp

@@ -7,13 +7,15 @@ namespace JabyEngine {
     enum struct CDFileType : uint8_t {
         SimpleTIM = 0,
         CopyTo,
+        Overlay,
     };
 
     struct __no_align CDFile {
         union __no_align Payload {
-            uint32_t  empty;
+            uint32_t  raw;
             SimpleTIM simple_tim;
             CopyTo    copy_to;
+            Overlay   overlay;
         };
 
         uint8_t    rel_lba_idx;
@@ -31,6 +33,10 @@ namespace JabyEngine {
         static constexpr CDFile copy_to(uint8_t rel_lba_idx, uint32_t* dst) {
             return CDFile{.rel_lba_idx = rel_lba_idx, .type = CDFileType::CopyTo, .payload = {.copy_to = CopyTo{dst}}};
         }
+
+        static constexpr CDFile overlay(uint8_t rel_lba_idx, uint32_t* overlay_dst) {
+            return CDFile{.rel_lba_idx = rel_lba_idx, .type = CDFileType::Overlay, .payload = {.overlay = Overlay{overlay_dst}}};
+        }
     };
 }
 #endif //!__JABYENGINE_CD_FILE_TYPES_HPP__

include/PSX/File/file_types.hpp

@@ -42,5 +42,7 @@ namespace JabyEngine {
     struct __no_align CopyTo {
         uint32_t* dst;
     };
+
+    typedef CopyTo Overlay;
 }
 #endif // !__JABYENGINE_FILE_TYPES_HPP__