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482 lines
9.8 KiB
ArmAsm
482 lines
9.8 KiB
ArmAsm
;
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; Ullrich von Bassewitz, 24.04.1999
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;
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; Routines for the 1351 proportional mouse. Parts of the code are from
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; the Commodore 1351 mouse users guide.
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;
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.export _mouse_init, _mouse_done
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.export _mouse_hide, _mouse_show
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.export _mouse_box, _mouse_info
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.export _mouse_move, _mouse_pos
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.export _mouse_buttons, _mouse_info
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.import popax, addysp1
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.importzp ptr1, sp
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.include "c64.inc"
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.macpack generic
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.code
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; --------------------------------------------------------------------------
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;
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; Constants
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;
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SPRITE_HEIGHT = 21
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SPRITE_WIDTH = 24
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SCREEN_HEIGHT = 200
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SCREEN_WIDTH = 320
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XCORR = SPRITE_WIDTH
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; --------------------------------------------------------------------------
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;
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; unsigned char __fastcall__ mouse_init (unsigned char type);
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;
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_mouse_init:
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lda OldIRQ+1 ; Already initialized?
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bne AlreadyInitialized ; Jump if yes
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; Initialize variables
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ldx #0
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lda #XCORR
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sta XPos
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stx XPos+1
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stx YPos
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stx YPos+1
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stx OldPotX
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stx OldPotY
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stx XMin
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stx XMin+1 ; XMin = 0
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lda #50 ; ## FIXME: This is the PAL value
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sta YCorr
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sta YPos
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stx YPos+1
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sec
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sbc #SPRITE_HEIGHT ; Sprite height in pixels
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sta YMin
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stx YMin+1 ; YMin = 29
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lda #SCREEN_HEIGHT ; Vertical screen res
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add YCorr ; Add correction factor
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sta YMax
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stx YMax+1
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inx ; X = 1
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stx Invisible ; Mouse *not* visible
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lda #<(SCREEN_WIDTH + SPRITE_WIDTH)
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sta XMax
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stx XMax+1 ; XMax = 320 + sprite width
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; Remember the old IRQ vector
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lda IRQVec
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sta OldIRQ
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lda IRQVec+1
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sta OldIRQ+1
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; Set our own IRQ vector.
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ldx #<MouseIRQ
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ldy #>MouseIRQ
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jsr SetIRQ ; Set our IRQ vector, disable sprite 0
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lda #1 ; Mouse successfully initialized
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rts
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AlreadyInitialized:
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lda #0 ; Error
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rts
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; --------------------------------------------------------------------------
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;
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; void mouse_done (void);
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;
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_mouse_done:
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ldx OldIRQ
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ldy OldIRQ+1 ; Initialized?
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beq Done ; Jump if no
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lda #0
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sta OldIRQ+1 ; Reset the initialized flag
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SetIRQ: sei ; Disable interrupts
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stx IRQVec ; Set the new/old vector
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sty IRQVec+1
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lda VIC_SPR_ENA ; Get sprite enable register
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and #$FE ; Disable sprite #0
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sta VIC_SPR_ENA ; Write back
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cli ; Enable interrupts
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Done: rts
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; --------------------------------------------------------------------------
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;
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; void mouse_hide (void);
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;
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_mouse_hide:
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lda Invisible ; Get the flag
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bne @L1 ; Jump if already invisible
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lda #$FE ; Clear bit for sprite #0
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sei ; Disable interrupts
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and VIC_SPR_ENA
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sta VIC_SPR_ENA ; Disable sprite
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cli ; Enable interrupts
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@L1: inc Invisible ; Set the flag to invisible
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rts
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; --------------------------------------------------------------------------
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;
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; void mouse_show (void);
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;
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_mouse_show:
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lda Invisible ; Mouse invisible?
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beq @L1 ; Jump if no
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dec Invisible ; Set the flag
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bne @L1 ; Jump if still invisible
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sei ; Disable interrupts
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jsr MoveSprite1 ; Move the sprite to it's position
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lda VIC_SPR_ENA ; Get sprite enable register
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ora #$01 ; Enable sprite #0
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sta VIC_SPR_ENA ; Write back
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cli ; Enable interrupts
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@L1: rts
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; --------------------------------------------------------------------------
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;
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; void __fastcall__ mouse_box (int minx, int miny, int maxx, int maxy);
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;
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_mouse_box:
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ldy #0 ; Stack offset
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add YCorr ; Adjust the Y value
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bcc @L1
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inx
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clc
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@L1: sei ; Disable interrupts
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sta YMax
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stx YMax+1 ; maxy
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lda (sp),y
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adc #XCORR
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sta XMax
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iny
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lda (sp),y
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adc #$00
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sta XMax+1 ; maxx
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iny
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lda (sp),y
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add YCorr
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sta YMin
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iny
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lda (sp),y
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adc #$00
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sta YMin+1 ; miny
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iny
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lda (sp),y
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add #XCORR
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sta XMin
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iny
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lda (sp),y
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adc #$00
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sta XMin+1 ; minx
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cli ; Enable interrupts
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jmp addysp1 ; Drop params, return
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; --------------------------------------------------------------------------
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;
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; void __fastcall__ mouse_pos (struct mouse_pos* pos);
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; /* Return the current mouse position */
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;
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_mouse_pos:
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sta ptr1
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stx ptr1+1 ; Remember the argument pointer
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ldy #0 ; Structure offset
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sec ; Needed for the SBC later
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sei ; Disable interrupts
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lda XPos ; Transfer the position
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sbc #XCORR
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sta (ptr1),y
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lda XPos+1
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sbc #$00
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iny
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sta (ptr1),y
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lda YPos
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ldx YPos+1
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cli ; Restore initial interrupt state
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sub YCorr ; Apply the Y correction value
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bcs @L1
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dex
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@L1: iny
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sta (ptr1),y ; Store YPos
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txa
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iny
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sta (ptr1),y
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rts ; Done
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; --------------------------------------------------------------------------
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;
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; void __fastcall__ mouse_info (struct mouse_info* info);
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; /* Return the state of the mouse buttons and the position of the mouse */
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;
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_mouse_info:
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; We're cheating here to keep the code smaller: The first fields of the
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; mouse_info struct are identical to the mouse_pos struct, so we will just
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; call _mouse_pos to initialize the struct pointer and fill the position
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; fields.
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jsr _mouse_pos
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; Fill in the button state
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jsr _mouse_buttons ; Will not touch ptr1
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ldy #4
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sta (ptr1),y
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rts
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; --------------------------------------------------------------------------
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;
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; void __fastcall__ mouse_move (int x, int y);
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;
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_mouse_move:
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add YCorr ; Add Y coordinate correction
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bcc @L1
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inx
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clc
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@L1: sei
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sta YPos
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stx YPos+1
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cli
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jsr popax ; Get X
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adc #XCORR ; Adjust X coordinate
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bcc @L2
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inx
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@L2: sei
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sta XPos
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stx XPos+1 ; Set new position
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jsr MoveSprite ; Move the sprite to the mouse pos
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cli ; Enable interrupts
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rts
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; --------------------------------------------------------------------------
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;
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; unsigned char mouse_buttons (void);
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;
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.proc _mouse_buttons
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lda #$7F
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sei
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sta CIA1_PRA
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lda CIA1_PRB ; Read joystick #0
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cli
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ldx #0
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and #$1F
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eor #$1F
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rts
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.endproc
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; --------------------------------------------------------------------------
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;
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; Mouse interrupt handler
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;
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MouseIRQ:
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cld
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lda SID_ADConv1 ; Get mouse X movement
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ldy OldPotX
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jsr MoveCheck ; Calculate movement vector
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sty OldPotX
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; Calculate the new X coordinate (--> a/y)
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add XPos
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tay ; Remember low byte
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txa
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adc XPos+1
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tax
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; Limit the X coordinate to the bounding box
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cpy XMin
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sbc XMin+1
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bpl @L1
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ldy XMin
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ldx XMin+1
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jmp @L2
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@L1: txa
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cpy XMax
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sbc XMax+1
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bmi @L2
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ldy XMax
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ldx XMax+1
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@L2: sty XPos
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stx XPos+1
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; Calculate the Y movement vector
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lda SID_ADConv2 ; Get mouse Y movement
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ldy OldPotY
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jsr MoveCheck ; Calculate movement
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sty OldPotY
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; Calculate the new Y coordinate (--> a/y)
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sta OldValue
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lda YPos
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sub OldValue
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tay
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stx OldValue
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lda YPos+1
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sbc OldValue
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tax
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cpy YMin
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sbc YMin+1
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bpl @L3
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ldy YMin
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ldx YMin+1
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jmp @L4
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@L3: txa
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cpy YMax
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sbc YMax+1
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bmi @L4
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ldy YMax
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ldx YMax+1
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@L4: sty YPos
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stx YPos+1
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; Move the mouse sprite if it is enabled
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jsr MoveSprite ; Move the sprite
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; Jump to the next IRQ handler
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jmp (OldIRQ)
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; --------------------------------------------------------------------------
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;
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; Move check routine, called for both coordinates.
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;
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; Entry: y = old value of pot register
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; a = current value of pot register
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; Exit: y = value to use for old value
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; x/a = delta value for position
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;
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MoveCheck:
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sty OldValue
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sta NewValue
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ldx #$00
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sub OldValue ; a = mod64 (new - old)
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and #%01111111
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cmp #%01000000 ; if (a > 0)
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bcs @L1 ;
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lsr a ; a /= 2;
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beq @L2 ; if (a != 0)
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ldy NewValue ; y = NewValue
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rts ; return
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@L1: ora #%11000000 ; else or in high order bits
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cmp #$FF ; if (a != -1)
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beq @L2
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sec
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ror a ; a /= 2
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dex ; high byte = -1 (X = $FF)
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ldy NewValue
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rts
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@L2: txa ; A = $00
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rts
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; --------------------------------------------------------------------------
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;
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; Move the mouse sprite to the current mouse position. Must be called
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; with interrupts off. MoveSprite1 is an entry without checking.
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;
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MoveSprite:
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lda Invisible ; Mouse visible?
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bne MoveSpriteDone ; Jump if no
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; Set the high X bit
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MoveSprite1:
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lda VIC_SPR_HI_X ; Get high X bits of all sprites
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and #$FE ; Clear bit for sprite #0
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ldy XPos+1 ; Test Y position
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beq @L1
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ora #$01 ; Set high X bit
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@L1: sta VIC_SPR_HI_X ; Set hi X sprite values
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; Set the low X byte
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lda XPos
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sta VIC_SPR0_X ; Set low byte
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; Set the Y position
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ldy YPos+1 ; Negative or too large?
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bne MoveSpriteDone ; Jump if yes
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lda YPos
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sta VIC_SPR0_Y ; Set Y position
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; Done
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MoveSpriteDone:
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rts
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; --------------------------------------------------------------------------
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; Data
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.bss
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OldIRQ: .res 2 ; Old IRQ vector
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OldValue: .res 1 ; Temp for MoveCheck routine
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NewValue: .res 1 ; Temp for MoveCheck routine
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YCorr: .res 1 ; Correction for Y coordinate
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Invisible: .res 1 ; Is the mouse invisible?
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OldPotX: .res 1 ; Old hw counter values
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OldPotY: .res 1
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XPos: .res 2 ; Current mouse position, X
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YPos: .res 2 ; Current mouse position, Y
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XMin: .res 2 ; X1 value of bounding box
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YMin: .res 2 ; Y1 value of bounding box
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XMax: .res 2 ; X2 value of bounding box
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YMax: .res 2 ; Y2 value of bounding box
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