.include "zeropage.inc"
.include "mouse-kernel.inc"
- .include "c64.inc"
+ .include "c64.inc"
.macpack generic
Vars:
YPos: .res 2 ; Current mouse position, Y
XPos: .res 2 ; Current mouse position, X
-XMin: .res 2 ; X1 value of bounding box
-YMin: .res 2 ; Y1 value of bounding box
-XMax: .res 2 ; X2 value of bounding box
-YMax: .res 2 ; Y2 value of bounding box
-Buttons: .res 1 ; Button mask
+XMin: .res 2 ; X1 value of bounding box
+YMin: .res 2 ; Y1 value of bounding box
+XMax: .res 2 ; X2 value of bounding box
+YMax: .res 2 ; Y2 value of bounding box
+Buttons: .res 1 ; Button mask
; Temporary value used in the int handler
.word 0 ; YMin
.word SCREEN_WIDTH ; XMax
.word SCREEN_HEIGHT ; YMax
- .byte 0 ; Buttons
+ .byte 0 ; Buttons
.endproc
.code
bpl @L1
cli
- rts
+ rts
;----------------------------------------------------------------------------
; GETBOX: Return the mouse bounding box. The parameters are passed as they
dey
bpl @L1
- rts
+ rts
;----------------------------------------------------------------------------
; MOVE: Move the mouse to a new position. The position is passed as it comes
lda (sp),y
sta XPos ; New X position
- jsr CMOVEX ; Move the cursor
+ jsr CMOVEX ; Move the cursor
- cli ; Allow interrupts
- rts
+ cli ; Allow interrupts
+ rts
;----------------------------------------------------------------------------
; BUTTONS: Return the button mask in a/x.
BUTTONS:
- lda Buttons
- ldx #$00
- rts
+ lda Buttons
+ ldx #$00
+ rts
;----------------------------------------------------------------------------
; POS: Return the mouse position in the MOUSE_POS struct pointed to by ptr1.
; No return code required.
-POS: ldy #MOUSE_POS::XCOORD ; Structure offset
+POS: ldy #MOUSE_POS::XCOORD ; Structure offset
- sei ; Disable interrupts
- lda XPos ; Transfer the position
- sta (ptr1),y
- lda XPos+1
- iny
- sta (ptr1),y
- lda YPos
+ sei ; Disable interrupts
+ lda XPos ; Transfer the position
+ sta (ptr1),y
+ lda XPos+1
iny
sta (ptr1),y
- lda YPos+1
- cli ; Enable interrupts
+ lda YPos
+ iny
+ sta (ptr1),y
+ lda YPos+1
+ cli ; Enable interrupts
iny
sta (ptr1),y ; Store last byte
- rts ; Done
+ rts ; Done
;----------------------------------------------------------------------------
; INFO: Returns mouse position and current button mask in the MOUSE_INFO
; call _mouse_pos to initialize the struct pointer and fill the position
; fields.
-INFO: jsr POS
+INFO: jsr POS
; Fill in the button state
- lda Buttons
- ldy #MOUSE_INFO::BUTTONS
- sta (ptr1),y
+ lda Buttons
+ ldy #MOUSE_INFO::BUTTONS
+ sta (ptr1),y
- rts
+ rts
;----------------------------------------------------------------------------
; IOCTL: Driver defined entry point. The wrapper will pass a pointer to ioctl
; Avoid crosstalk between the keyboard and a joystick.
-IRQ: ldy #%00000000 ; Set ports A and B to input
- sty CIA1_DDRB
- sty CIA1_DDRA ; Keyboard won't look like joystick
- lda CIA1_PRB ; Read Control-Port 1
- dec CIA1_DDRA ; Set port A back to output
- eor #%11111111 ; Bit goes up when switch goes down
- beq @Save ;(bze)
- dec CIA1_DDRB ; Joystick won't look like keyboard
- sty CIA1_PRB ; Set "all keys pushed"
+IRQ: ldy #%00000000 ; Set ports A and B to input
+ sty CIA1_DDRB
+ sty CIA1_DDRA ; Keyboard won't look like joystick
+ lda CIA1_PRB ; Read Control-Port 1
+ dec CIA1_DDRA ; Set port A back to output
+ eor #%11111111 ; Bit goes up when switch goes down
+ beq @Save ;(bze)
+ dec CIA1_DDRB ; Joystick won't look like keyboard
+ sty CIA1_PRB ; Set "all keys pushed"
@Save: sta Temp
; Check for a pressed button and place the result into Buttons
; Check left/right
lda Temp ; Read joystick #0
- and #(JOY::LEFT | JOY::RIGHT)
- beq @SkipX ;
+ and #(JOY::LEFT | JOY::RIGHT)
+ beq @SkipX ;
; We will cheat here and rely on the fact that either the left, OR the right
; bit can be active
- and #JOY::RIGHT ; Check RIGHT bit
- bne @Right
- lda #$FF
- tax
- bne @AddX ; Branch always
-@Right: lda #$01
- ldx #$00
+ and #JOY::RIGHT ; Check RIGHT bit
+ bne @Right
+ lda #$FF
+ tax
+ bne @AddX ; Branch always
+@Right: lda #$01
+ ldx #$00
; Calculate the new X coordinate (--> a/y)
@AddX: add XPos
- tay ; Remember low byte
- txa
- adc XPos+1
- tax
+ tay ; Remember low byte
+ txa
+ adc XPos+1
+ tax
; Limit the X coordinate to the bounding box
- cpy XMin
- sbc XMin+1
- bpl @L1
- ldy XMin
- ldx XMin+1
- jmp @L2
-@L1: txa
-
- cpy XMax
- sbc XMax+1
- bmi @L2
- ldy XMax
- ldx XMax+1
-@L2: sty XPos
- stx XPos+1
+ cpy XMin
+ sbc XMin+1
+ bpl @L1
+ ldy XMin
+ ldx XMin+1
+ jmp @L2
+@L1: txa
+
+ cpy XMax
+ sbc XMax+1
+ bmi @L2
+ ldy XMax
+ ldx XMax+1
+@L2: sty XPos
+ stx XPos+1
; Move the mouse pointer to the new X pos
; Calculate the Y movement vector
@SkipX: lda Temp ; Read joystick #0
- and #(JOY::UP | JOY::DOWN) ; Check up/down
- beq @SkipY ;
+ and #(JOY::UP | JOY::DOWN) ; Check up/down
+ beq @SkipY ;
; We will cheat here and rely on the fact that either the up, OR the down
; bit can be active
- lsr a ; Check UP bit
- bcc @Down
- lda #$FF
- tax
- bne @AddY
-@Down: lda #$01
- ldx #$00
+ lsr a ; Check UP bit
+ bcc @Down
+ lda #$FF
+ tax
+ bne @AddY
+@Down: lda #$01
+ ldx #$00
; Calculate the new Y coordinate (--> a/y)
-@AddY: add YPos
- tay ; Remember low byte
- txa
- adc YPos+1
- tax
+@AddY: add YPos
+ tay ; Remember low byte
+ txa
+ adc YPos+1
+ tax
; Limit the Y coordinate to the bounding box
- 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
+ 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 pointer to the new X pos
projects / cc65 / blobdiff