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103 lines
2.7 KiB
ArmAsm
103 lines
2.7 KiB
ArmAsm
;
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; Default mouse callbacks for the C64
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;
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; Ullrich von Bassewitz, 2004-03-20
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;
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; All functions in this module should be interrupt safe, because they may
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; be called from an interrupt handler
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;
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.export _mouse_def_callbacks
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.include "mouse-kernel.inc"
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.include "c64.inc"
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.macpack generic
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; Sprite definitions. The first value can be changed to adjust the number
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; of the sprite used for the mouse. All others depend on this value.
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MOUSE_SPR = 0 ; Sprite used for the mouse
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MOUSE_SPR_MASK = $01 .shl MOUSE_SPR ; Positive mask
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MOUSE_SPR_NMASK = .lobyte(.not MOUSE_SPR_MASK) ; Negative mask
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VIC_SPR_X = (VIC_SPR0_X + 2*MOUSE_SPR) ; Sprite X register
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VIC_SPR_Y = (VIC_SPR0_Y + 2*MOUSE_SPR) ; Sprite Y register
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.code
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; --------------------------------------------------------------------------
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; Hide the mouse pointer. Always called with interrupts disabled.
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.proc hide
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lda #MOUSE_SPR_NMASK
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and VIC_SPR_ENA
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sta VIC_SPR_ENA
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rts
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.endproc
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; --------------------------------------------------------------------------
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; Show the mouse pointer. Always called with interrupts disabled.
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.proc show
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lda #MOUSE_SPR_MASK
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ora VIC_SPR_ENA
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sta VIC_SPR_ENA
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rts
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.endproc
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; --------------------------------------------------------------------------
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; Move the mouse pointer X position to the value in a/x. Always called with
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; interrupts disabled.
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.proc movex
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; Add the X correction and set the low byte. This frees A.
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add #24 ; X correction
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sta VIC_SPR_X
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; Set the high byte
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txa
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adc #0
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bne @L1 ; Branch if high byte not zero
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lda VIC_SPR_HI_X ; Get high X bits of all sprites
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and #MOUSE_SPR_NMASK ; Clear high bit for sprite
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sta VIC_SPR_HI_X
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rts
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@L1: lda VIC_SPR_HI_X ; Get high X bits of all sprites
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ora #MOUSE_SPR_MASK ; Set high bit for sprite
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sta VIC_SPR_HI_X
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rts
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.endproc
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; --------------------------------------------------------------------------
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; Move the mouse pointer Y position to the value in a/x. Always called with
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; interrupts disabled.
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.proc movey
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add #50 ; Y correction (first visible line)
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sta VIC_SPR_Y ; Set Y position
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rts
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.endproc
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; --------------------------------------------------------------------------
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; Callback structure
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.rodata
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_mouse_def_callbacks:
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.addr hide
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.addr show
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.addr movex
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.addr movey
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