mirror of
https://github.com/cc65/cc65.git
synced 2024-07-05 06:28:57 +00:00
53dd513176
which included commits to RCS files with non-trunk default branches. git-svn-id: svn://svn.cc65.org/cc65/trunk@3 b7a2c559-68d2-44c3-8de9-860c34a00d81
385 lines
7.3 KiB
ArmAsm
385 lines
7.3 KiB
ArmAsm
;
|
|
; Ullrich von Bassewitz, 24.04.1999
|
|
;
|
|
; Routines for the 1351 proportional mouse. Parts of the code are from
|
|
; the Commodore 1351 mouse users guide.
|
|
;
|
|
|
|
.export _mouse_init, _mouse_done
|
|
.export _mouse_hide, _mouse_show
|
|
.export _mouse_box, _mouse_info
|
|
.export _mouse_move
|
|
|
|
.import popa, popsreg, addysp1
|
|
.importzp sp, sreg
|
|
|
|
.include "c64.inc"
|
|
|
|
.code
|
|
|
|
; --------------------------------------------------------------------------
|
|
;
|
|
; void __fastcall__ mouse_init (unsigned char port, unsigned char sprite);
|
|
;
|
|
|
|
_mouse_init:
|
|
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
|
|
|
|
; Initialize variables
|
|
|
|
ldx #0
|
|
stx XPos
|
|
stx XPos+1
|
|
stx YPos
|
|
stx YPos+1
|
|
stx OldPotX
|
|
stx OldPotY
|
|
stx XMin
|
|
stx XMin+1
|
|
stx YMin
|
|
stx YMin+1
|
|
stx YMax+1
|
|
inx ; X = 1
|
|
stx Visible ; Mouse *not* visible
|
|
stx XMax+1 ; >320
|
|
ldx #<320
|
|
stx XMax
|
|
ldx #200
|
|
stx YMax
|
|
|
|
; Remember the old IRQ vector
|
|
|
|
lda IRQVec
|
|
sta OldIRQ
|
|
lda IRQVec+1
|
|
sta OldIRQ+1
|
|
|
|
; Set our own IRQ vector
|
|
|
|
lda #<MouseIRQ
|
|
ldx #>MouseIRQ
|
|
bne SetIRQ
|
|
|
|
; --------------------------------------------------------------------------
|
|
;
|
|
; void mouse_done (void);
|
|
;
|
|
|
|
_mouse_done:
|
|
lda OldIRQ ; Initialized?
|
|
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
|
|
Done: rts
|
|
|
|
; --------------------------------------------------------------------------
|
|
;
|
|
; void mouse_hide (void);
|
|
;
|
|
|
|
_mouse_hide:
|
|
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
|
|
|
|
sei ; Disable interrupts
|
|
and VIC_SPR_ENA
|
|
sta VIC_SPR_ENA ; Disable sprite
|
|
cli ; Enable interrupts
|
|
|
|
@L1: inc Visible ; Set the flag to invisible
|
|
rts
|
|
|
|
; --------------------------------------------------------------------------
|
|
;
|
|
; void mouse_show (void);
|
|
;
|
|
|
|
_mouse_show:
|
|
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
|
|
|
|
@L1: rts
|
|
|
|
; --------------------------------------------------------------------------
|
|
;
|
|
; void __fastcall__ mouse_box (int minx, int miny, int maxx, int maxy);
|
|
;
|
|
|
|
_mouse_box:
|
|
sei ; Disable interrupts
|
|
|
|
sta YMax
|
|
stx YMax+1 ; maxy
|
|
|
|
ldy #0
|
|
lda (sp),y
|
|
sta XMax
|
|
iny
|
|
lda (sp),y
|
|
sta XMax+1 ; maxx
|
|
|
|
iny
|
|
lda (sp),y
|
|
sta YMin
|
|
iny
|
|
lda (sp),y
|
|
sta YMin+1 ; miny
|
|
|
|
iny
|
|
lda (sp),y
|
|
sta XMin
|
|
iny
|
|
lda (sp),y
|
|
sta XMin+1 ; minx
|
|
|
|
cli ; Enable interrupts
|
|
|
|
jmp addysp1 ; Drop params, return
|
|
|
|
; --------------------------------------------------------------------------
|
|
;
|
|
; void mouse_info (...);
|
|
;
|
|
|
|
_mouse_info:
|
|
rts
|
|
|
|
|
|
; --------------------------------------------------------------------------
|
|
;
|
|
; void __fastcall__ mouse_move (int x, int y);
|
|
;
|
|
|
|
_mouse_move:
|
|
jsr popsreg ; Get X
|
|
sei ; Disable interrupts
|
|
|
|
sta YPos
|
|
stx YPos+1
|
|
lda sreg
|
|
ldx sreg+1
|
|
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
|
|
rts
|
|
|
|
; --------------------------------------------------------------------------
|
|
;
|
|
; Mouse interrupt handler
|
|
;
|
|
|
|
MouseIRQ:
|
|
cld
|
|
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
|
|
|
|
; 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
|
|
|
|
; Calculate the Y movement vector
|
|
|
|
lda SID_ADConv2 ; Get mouse Y movement
|
|
ldy OldPotY
|
|
jsr MoveCheck ; Calculate movement
|
|
sty OldPotY
|
|
|
|
; Calculate the new Y coordinate (--> a/y)
|
|
|
|
clc
|
|
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
|
|
|
|
; Jump to the next IRQ handler
|
|
|
|
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
|
|
;
|
|
|
|
MoveCheck:
|
|
sty OldValue
|
|
sta NewValue
|
|
ldx #$00
|
|
|
|
sec ; a = mod64 (new - old)
|
|
sbc OldValue
|
|
and #%01111111
|
|
cmp #%01000000 ; if (a > 0)
|
|
bcs @L1 ;
|
|
lsr a ; a /= 2;
|
|
beq @L2 ; if (a != 0)
|
|
ldy NewValue ; y = NewValue
|
|
rts ; return
|
|
|
|
@L1: ora #%11000000 ; else or in high order bits
|
|
cmp #$FF ; if (a != -1)
|
|
beq @L2
|
|
sec
|
|
ror a ; a /= 2
|
|
ldx #$FF ; high byte = -1
|
|
ldy NewValue
|
|
rts
|
|
|
|
@L2: lda #0
|
|
rts
|
|
|
|
; --------------------------------------------------------------------------
|
|
;
|
|
; Move the mouse sprite to the current mouse position. Must be called
|
|
; with interrupts off.
|
|
;
|
|
|
|
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 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 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
|
|
|
|
; Done
|
|
|
|
@L9: rts
|
|
|
|
; --------------------------------------------------------------------------
|
|
; Data
|
|
|
|
.bss
|
|
|
|
OldIRQ: .res 2 ; Old IRQ vector
|
|
MousePort: .res 1 ; Port used for the mouse
|
|
MouseSprite: .res 1 ; Number of sprite to control
|
|
OldValue: .res 1 ; Temp for MoveCheck routine
|
|
NewValue: .res 1 ; Temp for MoveCheck routine
|
|
|
|
Visible: .res 1 ; Is the mouse visible?
|
|
OldPotX: .res 1 ; Old hw counter values
|
|
OldPotY: .res 1
|
|
|
|
XPos: .res 2 ; Current mouse position, X
|
|
YPos: .res 2 ; Current mouse position, Y
|
|
|
|
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
|
|
|
|
.data
|
|
|
|
BitMask: .byte $01, $02, $04, $08, $10, $20, $40, $80
|
|
|
|
|
|
|
|
|
|
|