4065cb1983
The Apple2 doesn't have sprites so the Apple2 mouse callbacks place a special character on the text screen to indicate the mouse position. In order to support the necessary character removing and redrawing the Apple2 mouse driver called the Apple2 mouse callbacks in an "unusual way". So far so (sort of) good. However the upcoming Atari mouse driver aims to support both "sprite-type" mouse callbacks as well as "text-char-type" mouse callbacks. Therefore the interface between mouse drivers and callbacks needs to be extended to allow the mouse callbacks to hide their different types from the mouse driver. The nature of this change can be seen best by looking at the Apple2 file modifications. The CBM drivers and callbacks (at least the current ones) don't benefit from this change.
120 lines
3.1 KiB
ArmAsm
120 lines
3.1 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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; Draw the mouse pointer. Always called with interrupts disabled.
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.proc draw
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rts
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.endproc
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; --------------------------------------------------------------------------
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; Prepare to move the mouse pointer. Always called with interrupts disabled.
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.proc move
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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 draw
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.addr move
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.addr movex
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.addr movey
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