fox32rom/mouse.asm

109 lines
2.9 KiB
NASM

; mouse routines
; gets the current position of the mouse cursor
; this gets the position of the cursor overlay, rather than actually getting the mouse position
; inputs:
; none
; outputs:
; r0: X coordinate
; r1: Y coordinate
get_mouse_position:
in r0, 0x8000001F ; overlay 31: position
mov r1, r0
and r0, 0x0000FFFF ; r0: overlay X position
sra r1, 16 ; r1: overlay Y position
ret
; gets the current state of the mouse button
; inputs:
; none
; outputs:
; r0: button state
get_mouse_button:
in r0, 0x80000400 ; mouse button states
ret
; updates the cursor position and adds a mouse_click_event_type event to the event queue if the mouse button was clicked
; this should only be called by system_vsync_handler
mouse_update:
push r0
push r1
push r2
push r3
push r4
push r5
push r6
push r7
mov r0, 0x8000001F ; overlay 31: position
in r2, 0x80000401 ; mouse position
out r0, r2
movz.16 r0, r2 ; r0: X position
mov r1, r2
sra r1, 16 ; r1: Y position
mov r2, 0x80000400 ; mouse button states
in r3, r2
; check click bit
bts r3, 0
ifz jmp mouse_update_end
; mouse was clicked, clear the click bit
bcl r3, 0
out r2, r3
; check if the mouse was clicked in the menu bar
;mov r2, 30
;call overlay_check_if_enabled_covers_position
;ifz jmp mouse_update_menu_was_clicked
; if Y <= 16, mouse was clicked in the menu bar
; this is less expensive than calling overlay_check_if_enabled_covers_position every frame
; first check if the menu bar is enabled
in r3, 0x8000031E ; overlay 30: enable status
cmp r3, 0
ifz jmp mouse_update_no_menu
cmp r1, 17
ifc jmp mouse_update_menu_was_clicked
mouse_update_no_menu:
; if a menu is open, don't push a click event
; this is hacky as fuck
in r3, 0x8000031D ; overlay 29: enable status
cmp r3, 0
ifnz jmp mouse_update_end
; otherwise, just add a standard mouse click event to the event queue
mov r2, r1 ; copy Y position to event parameter 1
mov r1, r0 ; copy X position to event parameter 0
mov r3, 0
mov r4, 0
mov r5, 0
mov r6, 0
mov r7, 0
mov r0, MOUSE_CLICK_EVENT_TYPE ; set event type to mouse type
call new_event
jmp mouse_update_end
mouse_update_menu_was_clicked:
mov r2, r1 ; copy Y position to event parameter 1
mov r1, r0 ; copy X position to event parameter 0
mov r3, 0
mov r4, 0
mov r5, 0
mov r6, 0
mov r7, 0
mov r0, MENU_BAR_CLICK_EVENT_TYPE ; set event type to menu bar click type
call new_event
mouse_update_end:
pop r7
pop r6
pop r5
pop r4
pop r3
pop r2
pop r1
pop r0
ret