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113 lines
2.7 KiB
ArmAsm
113 lines
2.7 KiB
ArmAsm
;
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; Default mouse callbacks for the Ataris
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;
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; Christian Groessler, 03.01.2014
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;
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; derived from Apple2 version by
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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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.importzp tmp4
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.import mul40,loc_tmp
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.include "atari.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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.segment "EXTZP" : zeropage
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scrptr: .res 2
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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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cursor = 11 ; '+' screen code'
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; setcursor
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getcursor:
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column: ldy #$00 ; Patched at runtime
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lda (scrptr),y ; 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 (scrptr),y ; Patched at runtime
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rts
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; ------------------------------------------------------------------------
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.code
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done:
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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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cpx #1
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ror a
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lsr a ; convert to character position
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lsr a
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sta column+1
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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
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ldy tmp4 ; mul40 uses tmp4
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lda loc_tmp ; and this local variable
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pha
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txa ; get parameter back
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lsr a ; convert y position to character line
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lsr a
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lsr a
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jsr mul40
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clc
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adc SAVMSC
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sta scrptr
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txa
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adc SAVMSC+1
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sta scrptr+1
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pla
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sta loc_tmp
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sty tmp4
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rts
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