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126 lines
2.7 KiB
ArmAsm
126 lines
2.7 KiB
ArmAsm
;
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; Default mouse callbacks for the Apple II
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;
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; Oliver Schmidt, 22.09.2005
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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 "apple2.inc"
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; ------------------------------------------------------------------------
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.bss
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backup: .res 1
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; ------------------------------------------------------------------------
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.rodata
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; Callback structure
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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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; ------------------------------------------------------------------------
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.data
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.ifdef __APPLE2ENH__
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cursor = 'B' ; MouseText character
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.else
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cursor = '+' | $40 ; Flashing crosshair
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.endif
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getcursor:
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.ifdef __APPLE2ENH__
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bit RD80VID ; In 80 column mode?
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bpl column ; No, skip bank switching
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switch: bit LOWSCR ; Patched at runtime
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.endif
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column: ldx #$00 ; Patched at runtime
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getscr: lda $0400,x ; Patched at runtime
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cmp #cursor
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rts
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setcursor:
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lda #cursor
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setscr: sta $0400,x ; Patched at runtime
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.ifdef __APPLE2ENH__
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bit LOWSCR ; Doesn't hurt in 40 column mode
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.endif
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rts
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; ------------------------------------------------------------------------
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.code
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done:
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.ifdef __APPLE2ENH__
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bit LOWSCR ; Doesn't hurt in 40 column mode
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.endif
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rts
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; Hide the mouse cursor.
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hide:
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jsr getcursor ; Cursor visible at current position?
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bne done ; No, we're done
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lda backup ; Get character at cursor position
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jmp setscr ; Draw character
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; Show the mouse cursor.
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show:
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jsr getcursor ; Cursor visible at current position?
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beq done ; Yes, we're done
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sta backup ; Save character at cursor position
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jmp setcursor ; Draw cursor
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; Move the mouse cursor x position to the value in A/X.
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movex:
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dex ; Is position [256..279]?
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bmi :+ ; No, start with column 0
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clc
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adc #$0100 .MOD 7 ; Bias position
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ldx #$0100 / 7 - 1 ; Bias column
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: sec
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: sbc #7 ; 280 positions / 40 columns
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inx
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bcs :-
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stx column+1
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.ifdef __APPLE2ENH__
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adc #7 / 2 ; Left or right half of 40-col column?
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ldx #<LOWSCR ; Columns 1,3,5..79
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bcs :+
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.assert LOWSCR + 1 = HISCR, error
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inx ; Columns 0,2,4..78
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: stx switch+1
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.endif
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rts
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; Move the mouse cursor y position to the value in A/X.
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movey:
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tax ; ABCDExxx
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lsr ; 0ABCDExx
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lsr ; 00ABCDEx
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lsr ; 000ABCDE
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sta getscr+1
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lsr ; 0000ABCD
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and #%00000011 ; 000000CD
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ora #>$0400 ; 000001CD
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sta getscr+2
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sta setscr+2
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txa ; ABCDExxx
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ror ; EABCDExx
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and #%11100000 ; EAB00000
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ora getscr+1 ; EABABCDE
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and #%11111000 ; EABAB000
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sta getscr+1
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sta setscr+1
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rts
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