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384
libsrc/c64/mouse.s
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384
libsrc/c64/mouse.s
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;
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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
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.import popa, popsreg, addysp1
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.importzp sp, sreg
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.include "c64.inc"
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.code
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; --------------------------------------------------------------------------
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;
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; void __fastcall__ mouse_init (unsigned char port, unsigned char sprite);
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;
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_mouse_init:
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tax ; Save sprite number
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jsr popa ; Get the port number
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ldy OldIRQ+1 ; Already initialized?
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bne Done ; Jump if yes
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stx MouseSprite ; Remember the sprite number
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sta MousePort ; Remember the port number
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; Initialize variables
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ldx #0
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stx 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
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stx YMin
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stx YMin+1
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stx YMax+1
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inx ; X = 1
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stx Visible ; Mouse *not* visible
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stx XMax+1 ; >320
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ldx #<320
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stx XMax
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ldx #200
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stx YMax
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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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lda #<MouseIRQ
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ldx #>MouseIRQ
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bne SetIRQ
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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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lda OldIRQ ; Initialized?
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ldx OldIRQ+1
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beq Done ; Jump if no
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ldy #0
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sty OldIRQ+1 ; Reset the initialized flag
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SetIRQ: sei ; Disable interrupts
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sta IRQVec ; Set the new/old vector
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stx IRQVec+1
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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 Visible ; Get the flag
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bne @L1 ; Jump if already invisible
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ldx MouseSprite ; Sprite defined?
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beq @L1 ; Jump if no
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lda BitMask-1,x ; Get bit mask
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eor #$FF ; We must clear the bit
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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 Visible ; 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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dec Visible ; Get the flag
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bne @L1 ; Jump if still invisible
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ldx MouseSprite ; Sprite defined?
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beq @L1 ; Jump if no
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lda BitMask-1,x ; Get bit mask
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sei ; Disable interrupts
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ora VIC_SPR_ENA
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sta VIC_SPR_ENA ; Enable sprite
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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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sei ; Disable interrupts
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sta YMax
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stx YMax+1 ; maxy
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ldy #0
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lda (sp),y
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sta XMax
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iny
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lda (sp),y
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sta XMax+1 ; maxx
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iny
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lda (sp),y
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sta YMin
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iny
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lda (sp),y
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sta YMin+1 ; miny
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iny
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lda (sp),y
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sta XMin
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iny
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lda (sp),y
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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 mouse_info (...);
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;
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_mouse_info:
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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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jsr popsreg ; Get X
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sei ; Disable interrupts
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sta YPos
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stx YPos+1
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lda sreg
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ldx sreg+1
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sta XPos
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stx XPos+1 ; Set new position
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lda Visible ; Mouse visible?
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bne @L9 ; Jump if no
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lda MouseSprite ; Sprite defined?
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beq @L9
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jsr MoveSprite ; Move the sprite to the mouse pos
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@L9: cli ; Enable interrupts
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rts
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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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clc
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adc 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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; Limit the X coordinate to the bounding box
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cpy XMin+1
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bne @L1
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cmp XMin
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@L1: bpl @L2
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ldy XMin
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lda XMin+1
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jmp @L4
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@L2: cpy XMax+1
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bne @L3
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cmp XMax
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beq @L4
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@L3: bmi @L4
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ldy XMax
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lda XMax+1
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@L4: sty XPos
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sta 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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clc
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adc YPos
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tay ; Remember low byte
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txa
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adc YPos+1
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; Limit the Y coordinate to the bounding box
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cpy YMin+1
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bne @L5
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cmp YMin
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@L5: bpl @L6
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ldy YMin
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lda YMin+1
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jmp @L8
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@L6: cpy YMax+1
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bne @L7
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cmp YMax
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beq @L8
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@L7: bmi @L8
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ldy YMax
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lda YMax+1
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@L8: sty YPos
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sta YPos+1
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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 #$00
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sec ; a = mod64 (new - old)
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sbc OldValue
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and #%01111111
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cmp #%01000000 ; if (a > 0)
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bcs @L1 ;
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lsr a ; a /= 2;
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beq @L2 ; if (a != 0)
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ldy NewValue ; y = NewValue
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rts ; return
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@L1: ora #%11000000 ; else or in high order bits
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cmp #$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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ldx #$FF ; high byte = -1
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ldy NewValue
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rts
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@L2: lda #0
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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.
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;
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MoveSprite:
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lda Visible ; Mouse pointer visible?
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bne @L9 ; Jump if no
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ldx MouseSprite ; Sprite defined?
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beq @L9 ; Jump if no
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ldy BitMask-1,x ; Get high bit mask
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txa
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asl a ; Index*2
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tax
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; Set the X position
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lda XPos+1 ; Negative?
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bmi @L2 ; Jump if yes
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beq @L1
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tya ; Load high position bit
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@L1: ora VIC_SPR_HI_X ; Set high bit
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sta VIC_SPR_HI_X
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lda XPos
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sta VIC_SPR0_X,x ; Set low byte
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; Set the Y position
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@L2: ldy YPos+1 ; Negative or too large?
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bne @L9 ; Jump if yes
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lda YPos
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sta VIC_SPR0_Y,x ; Set Y position
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; Done
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@L9: 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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MousePort: .res 1 ; Port used for the mouse
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MouseSprite: .res 1 ; Number of sprite to control
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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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Visible: .res 1 ; Is the mouse visible?
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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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.data
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BitMask: .byte $01, $02, $04, $08, $10, $20, $40, $80
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