; the Commodore 1351 mouse users guide.
;
- .export _mouse_init, _mouse_done
- .export _mouse_hide, _mouse_show
- .export _mouse_box, _mouse_info
- .export _mouse_move
+ .export _mouse_init, _mouse_done
+ .export _mouse_hide, _mouse_show
+ .export _mouse_box, _mouse_info
+ .export _mouse_x, _mouse_y
+ .export _mouse_move
.import popa, popsreg, addysp1
- .importzp sp, sreg
+ .importzp sp, sreg
- .include "c64.inc"
+ .include "c64.inc"
.code
;
_mouse_init:
- tax ; Save sprite number
- jsr popa ; Get the port number
+ tax ; Save sprite number
+ jsr popa ; Get the port number
ldy OldIRQ+1 ; Already initialized?
bne Done ; Jump if yes
- stx MouseSprite ; Remember the sprite number
- sta MousePort ; Remember the port number
+ stx MouseSprite ; Remember the sprite number
+ sta MousePort ; Remember the port number
; Initialize variables
ldx #0
stx XPos
stx XPos+1
- stx YPos
+ stx YPos
stx YPos+1
stx OldPotX
stx OldPotY
stx XMin+1
stx YMin
stx YMin+1
- stx YMax+1
+ stx YMax+1
inx ; X = 1
stx Visible ; Mouse *not* visible
stx XMax+1 ; >320
_mouse_done:
lda OldIRQ ; Initialized?
- ldx OldIRQ+1
+ ldx OldIRQ+1
beq Done ; Jump if no
- ldy #0
- sty OldIRQ+1 ; Reset the initialized flag
-SetIRQ: sei ; Disable interrupts
- sta IRQVec ; Set the new/old vector
- stx IRQVec+1
- cli ; Enable interrupts
+ ldy #0
+ sty OldIRQ+1 ; Reset the initialized flag
+SetIRQ: sei ; Disable interrupts
+ sta IRQVec ; Set the new/old vector
+ stx IRQVec+1
+ cli ; Enable interrupts
Done: rts
; --------------------------------------------------------------------------
;
_mouse_hide:
- lda Visible ; Get the flag
- bne @L1 ; Jump if already invisible
- ldx MouseSprite ; Sprite defined?
- beq @L1 ; Jump if no
+ lda Visible ; Get the flag
+ bne @L1 ; Jump if already invisible
+ ldx MouseSprite ; Sprite defined?
+ beq @L1 ; Jump if no
- lda BitMask-1,x ; Get bit mask
- eor #$FF ; We must clear the bit
+ lda NotMask-1,x ; Get clean mask
- sei ; Disable interrupts
- and VIC_SPR_ENA
- sta VIC_SPR_ENA ; Disable sprite
- cli ; Enable interrupts
+ sei ; Disable interrupts
+ and VIC_SPR_ENA
+ sta VIC_SPR_ENA ; Disable sprite
+ cli ; Enable interrupts
-@L1: inc Visible ; Set the flag to invisible
+@L1: inc Visible ; Set the flag to invisible
rts
; --------------------------------------------------------------------------
;
_mouse_show:
- dec Visible ; Get the flag
- bne @L1 ; Jump if still invisible
- ldx MouseSprite ; Sprite defined?
- beq @L1 ; Jump if no
+ lda Visible ; Mouse already visible?
+ beq @L1 ; Jump if yes
+ dec Visible ; Get the flag
+ bne @L1 ; Jump if still invisible
+ ldx MouseSprite ; Sprite defined?
+ beq @L1 ; Jump if no
- lda BitMask-1,x ; Get bit mask
- sei ; Disable interrupts
- ora VIC_SPR_ENA
- sta VIC_SPR_ENA ; Enable sprite
- cli ; Enable interrupts
+ sei ; Disable interrupts
+ jsr MoveSprite1 ; Move the sprite to it's position
+
+ ldx MouseSprite ; Get sprite number (again)
+ lda BitMask-1,x ; Get bit mask
+ ora VIC_SPR_ENA
+ sta VIC_SPR_ENA ; Enable sprite
+
+ cli ; Enable interrupts
@L1: rts
;
_mouse_box:
- sei ; Disable interrupts
+ ldy #0 ; Stack offset
+
+ php
+ sei ; Disable interrupts
+
+ sta YMax
+ stx YMax+1 ; maxy
+
+ lda (sp),y
+ sta XMax
+ iny
+ lda (sp),y
+ sta XMax+1 ; maxx
- sta YMax
- stx YMax+1 ; maxy
+ iny
+ lda (sp),y
+ sta YMin
+ iny
+ lda (sp),y
+ sta YMin+1 ; miny
- ldy #0
- lda (sp),y
- sta XMax
- iny
- lda (sp),y
- sta XMax+1 ; maxx
+ iny
+ lda (sp),y
+ sta XMin
+ iny
+ lda (sp),y
+ sta XMin+1 ; minx
- iny
- lda (sp),y
- sta YMin
- iny
- lda (sp),y
- sta YMin+1 ; miny
+ plp ; Enable interrupts
+
+ jmp addysp1 ; Drop params, return
+
+; --------------------------------------------------------------------------
+;
+; int __fastcall__ mouse_x (void);
+;
- iny
- lda (sp),y
- sta XMin
- iny
- lda (sp),y
- sta XMin+1 ; minx
+_mouse_x:
+ php
+ sei
+ lda XPos
+ ldx XPos+1
+ plp
+ rts
- cli ; Enable interrupts
+; --------------------------------------------------------------------------
+;
+; int __fastcall__ mouse_y (void);
+;
- jmp addysp1 ; Drop params, return
+_mouse_y:
+ php
+ sei
+ lda YPos
+ ldx YPos+1
+ plp
+ rts
; --------------------------------------------------------------------------
;
stx YPos+1
lda sreg
ldx sreg+1
- sta XPos
+ sta XPos
stx XPos+1 ; Set new position
- lda Visible ; Mouse visible?
- bne @L9 ; Jump if no
- lda MouseSprite ; Sprite defined?
- beq @L9
-
jsr MoveSprite ; Move the sprite to the mouse pos
@L9: cli ; Enable interrupts
MouseIRQ:
cld
- lda SID_ADConv1 ; Get mouse X movement
- ldy OldPotX
- jsr MoveCheck ; Calculate movement vector
- sty OldPotX
+ lda SID_ADConv1 ; Get mouse X movement
+ ldy OldPotX
+ jsr MoveCheck ; Calculate movement vector
+ sty OldPotX
; Calculate the new X coordinate (--> a/y)
- clc
- adc XPos
- tay ; Remember low byte
- txa
- adc XPos+1
+ clc
+ adc XPos
+ tay ; Remember low byte
+ txa
+ adc XPos+1
+ tax
; Limit the X coordinate to the bounding box
- cpy XMin+1
- bne @L1
- cmp XMin
-@L1: bpl @L2
- ldy XMin
- lda XMin+1
- jmp @L4
-
-@L2: cpy XMax+1
- bne @L3
- cmp XMax
- beq @L4
-@L3: bmi @L4
- ldy XMax
- lda XMax+1
-@L4: sty XPos
- sta XPos+1
+ cpy XMin
+ sbc XMin+1
+ bpl @L1
+ ldy XMin
+ ldx XMin+1
+ jmp @L2
+@L1: txa
+
+ cpy XMax
+ sbc XMax+1
+ bmi @L2
+ ldy XMax
+ ldx XMax+1
+@L2: sty XPos
+ stx XPos+1
; Calculate the Y movement vector
adc YPos
tay ; Remember low byte
txa
- adc YPos+1
-
-; Limit the Y coordinate to the bounding box
-
- cpy YMin+1
- bne @L5
- cmp YMin
-@L5: bpl @L6
- ldy YMin
- lda YMin+1
- jmp @L8
-
-@L6: cpy YMax+1
- bne @L7
- cmp YMax
- beq @L8
-@L7: bmi @L8
- ldy YMax
- lda YMax+1
-@L8: sty YPos
- sta YPos+1
+ adc YPos+1
+
+ cpy YMin
+ sbc YMin+1
+ bpl @L3
+ ldy YMin
+ ldx YMin+1
+ jmp @L4
+@L3: txa
+
+ cpy YMax
+ sbc YMax+1
+ bmi @L4
+ ldy YMax
+ ldx YMax+1
+@L4: sty YPos
+ stx YPos+1
+
+; Move the mouse sprite if it is enabled
+
+ jsr MoveSprite ; Move the sprite
; Jump to the next IRQ handler
- jmp (OldIRQ)
+ jmp (OldIRQ)
; --------------------------------------------------------------------------
;
; Move check routine, called for both coordinates.
;
-; Entry: y = old value of pot register
-; a = current value of pot register
-; Exit: y = value to use for old value
-; x/a = delta value for position
+; Entry: y = old value of pot register
+; a = current value of pot register
+; Exit: y = value to use for old value
+; x/a = delta value for position
;
MoveCheck:
sty OldValue
sta NewValue
- ldx #$00
+ ldx #$00
sec ; a = mod64 (new - old)
sbc OldValue
bcs @L1 ;
lsr a ; a /= 2;
beq @L2 ; if (a != 0)
- ldy NewValue ; y = NewValue
- rts ; return
+ ldy NewValue ; y = NewValue
+ rts ; return
-@L1: ora #%11000000 ; else or in high order bits
- cmp #$FF ; if (a != -1)
- beq @L2
+@L1: ora #%11000000 ; else or in high order bits
+ cmp #$FF ; if (a != -1)
+ beq @L2
sec
- ror a ; a /= 2
- ldx #$FF ; high byte = -1
- ldy NewValue
+ ror a ; a /= 2
+ ldx #$FF ; high byte = -1
+ ldy NewValue
rts
-@L2: lda #0
+@L2: lda #0
rts
; --------------------------------------------------------------------------
;
; Move the mouse sprite to the current mouse position. Must be called
-; with interrupts off.
+; with interrupts off. MoveSprite1 is an entry without checking and
+; loading X
;
MoveSprite:
- lda Visible ; Mouse pointer visible?
- bne @L9 ; Jump if no
- ldx MouseSprite ; Sprite defined?
- beq @L9 ; Jump if no
- ldy BitMask-1,x ; Get high bit mask
- txa
- asl a ; Index*2
- tax
-; Set the X position
+ lda Visible ; Mouse visible?
+ bne MoveSpriteDone ; Jump if no
+ ldx MouseSprite ; Sprite defined?
+ beq MoveSpriteDone ; Jump if no
+
+; Set the high X bit
+
+MoveSprite1:
+ lda VIC_SPR_HI_X ; Get high X bits of all sprites
+ and NotMask-1,x ; Mask out sprite bit
+ ldy XPos+1 ; Test Y position
+ beq @L1
+ ora BitMask-1,x ; Set high X bit
+@L1: sta VIC_SPR_HI_X ; Set hi X sprite values
- lda XPos+1 ; Negative?
- bmi @L2 ; Jump if yes
- beq @L1
- tya ; Load high position bit
-@L1: ora VIC_SPR_HI_X ; Set high bit
- sta VIC_SPR_HI_X
- lda XPos
- sta VIC_SPR0_X,x ; Set low byte
+; Set the low X byte
+
+ txa
+ asl a ; Index*2
+ tax
+ lda XPos
+ sta VIC_SPR0_X-2,x ; Set low byte
; Set the Y position
-@L2: ldy YPos+1 ; Negative or too large?
- bne @L9 ; Jump if yes
- lda YPos
- sta VIC_SPR0_Y,x ; Set Y position
+ ldy YPos+1 ; Negative or too large?
+ bne MoveSpriteDone ; Jump if yes
+ lda YPos
+ sta VIC_SPR0_Y-2,x ; Set Y position
; Done
-@L9: rts
+MoveSpriteDone:
+ rts
; --------------------------------------------------------------------------
; Data
.data
BitMask: .byte $01, $02, $04, $08, $10, $20, $40, $80
+NotMask: .byte $FE, $FD, $FB, $F7, $EF, $DF, $BF, $7F
+
-
projects / cc65 / commitdiff