137 lines
2.2 KiB
NASM
137 lines
2.2 KiB
NASM
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; window event routines
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const WINDOW_EVENT_SIZE: 32
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; get the next window event and remove it from the event queue
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; inputs:
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; r0: pointer to window struct
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; outputs:
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; r0: event type
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; r1-r7: event parameters
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get_next_window_event:
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push r10
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push r11
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; r10: event_queue_ptr
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mov r10, r0
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add r10, 4
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; r11: event_queue_bottom
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mov r11, r0
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add r11, 8
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cmp [r10], [r11]
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ifz pop r11
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ifz pop r10
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ifz jmp window_event_empty
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get_next_window_event_0:
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push r8
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push r9
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mov r8, [r11]
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call window_event_load
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mov r8, window_event_temp
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call window_event_store
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mov r9, [r11]
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get_next_window_event_1:
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add r9, WINDOW_EVENT_SIZE
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cmp [r10], r9
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ifz jmp get_next_window_event_2
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mov r8, r9
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call window_event_load
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mov r8, r9
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sub r8, WINDOW_EVENT_SIZE
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call window_event_store
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jmp get_next_window_event_1
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get_next_window_event_2:
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mov r8, window_event_temp
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call window_event_load
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sub [r10], WINDOW_EVENT_SIZE
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pop r9
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pop r8
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pop r11
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pop r10
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ret
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; add an event to a window's event queue
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; inputs:
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; r0: event type
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; r1-r7: event parameters
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; r8: pointer to window struct
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; outputs:
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; none
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new_window_event:
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push r8
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push r9
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mov r9, r8
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add r9, 4 ; point to event_queue_ptr in the window struct
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mov r8, [r9]
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call window_event_store
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mov [r9], r8
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pop r9
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pop r8
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ret
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window_event_load:
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mov r0, [r8]
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add r8, 4
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mov r1, [r8]
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add r8, 4
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mov r2, [r8]
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add r8, 4
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mov r3, [r8]
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add r8, 4
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mov r4, [r8]
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add r8, 4
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mov r5, [r8]
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add r8, 4
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mov r6, [r8]
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add r8, 4
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mov r7, [r8]
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add r8, 4
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ret
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window_event_store:
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mov [r8], r0
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add r8, 4
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mov [r8], r1
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add r8, 4
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mov [r8], r2
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add r8, 4
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mov [r8], r3
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add r8, 4
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mov [r8], r4
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add r8, 4
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mov [r8], r5
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add r8, 4
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mov [r8], r6
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add r8, 4
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mov [r8], r7
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add r8, 4
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ret
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window_event_empty:
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mov r0, EVENT_TYPE_EMPTY
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mov r1, 0
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mov r2, 0
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mov r3, 0
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mov r4, 0
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mov r5, 0
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mov r6, 0
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mov r7, 0
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ret
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window_event_temp: data.fill 0, 32 ; 8 entries * 4 bytes per word
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