Add some convenience routines for moving and resizing overlays

fox32rom.def

@@ -43,6 +43,11 @@ draw_pixel_to_overlay:                    jmp [0xF004301C]
 draw_filled_rectangle_to_overlay:         jmp [0xF0043020]
 check_if_overlay_covers_position:         jmp [0xF0043024]
 check_if_enabled_overlay_covers_position: jmp [0xF0043028]
+enable_overlay:                           jmp [0xF004302C]
+disable_overlay:                          jmp [0xF0043030]
+move_overlay:                             jmp [0xF0043034]
+resize_overlay:                           jmp [0xF0043038]
+set_overlay_framebuffer_pointer:          jmp [0xF004303C]
 
 ; menu bar jump table
 enable_menu_bar:                          jmp [0xF0044000]

main.asm

@@ -189,6 +189,11 @@ get_rom_version:
     data.32 draw_filled_rectangle_to_overlay
     data.32 check_if_overlay_covers_position
     data.32 check_if_enabled_overlay_covers_position
+    data.32 enable_overlay
+    data.32 disable_overlay
+    data.32 move_overlay
+    data.32 resize_overlay
+    data.32 set_overlay_framebuffer_pointer
 
     ; menu bar jump table
     org.pad 0xF0044000

overlay.asm

@@ -1,5 +1,79 @@
 ; overlay routines
 
+; enable an overlay
+; inputs:
+; r0: overlay number
+; outputs:
+; none
+enable_overlay:
+    push r0
+
+    or r0, 0x80000300
+    out r0, 1
+
+    pop r0
+    ret
+
+; disable an overlay
+; inputs:
+; r0: overlay number
+; outputs:
+; none
+disable_overlay:
+    push r0
+
+    or r0, 0x80000300
+    out r0, 0
+
+    pop r0
+    ret
+
+; move an overlay
+; r0: X position
+; r1: Y position
+; r2: overlay number
+move_overlay:
+    push r1
+    push r2
+
+    or r2, 0x80000000
+    sla r1, 16
+    mov.16 r1, r0
+    out r2, r1
+
+    pop r2
+    pop r1
+    ret
+
+; resize an overlay
+; r0: width
+; r1: height
+; r2: overlay number
+resize_overlay:
+    push r1
+    push r2
+
+    or r2, 0x80000100
+    sla r1, 16
+    mov.16 r1, r0
+    out r2, r1
+
+    pop r2
+    pop r1
+    ret
+
+; set an overlay's framebuffer pointer
+; r0: framebuffer pointer
+; r1: overlay number
+set_overlay_framebuffer_pointer:
+    push r1
+
+    or r1, 0x80000200
+    out r1, r0
+
+    pop r1
+    ret
+
 ; fill a whole overlay with a color
 ; inputs:
 ; r0: color