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https://github.com/cc65/cc65.git
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577 lines
9.2 KiB
ArmAsm
577 lines
9.2 KiB
ArmAsm
;--------------------------------------------------------------------
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; Atari 8-bit mouse routines -- 05/07/2000 Freddy Offenga
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; Some changes by Christian Groessler, Ullrich von Bassewitz
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;
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; The following devices are supported:
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; - Atari trak-ball
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; - ST mouse
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; - Amiga mouse
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;
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; Mouse checks are done in the timer 1 IRQ and the mouse arrow is
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; drawn in player 0 during the vertical blank
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;--------------------------------------------------------------------
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.export _mouse_init, _mouse_done, _mouse_box
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.export _mouse_show, _mouse_hide, _mouse_move
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.export _mouse_buttons, _mouse_pos, _mouse_info
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.constructor initmouse,27
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.import popax
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.importzp ptr1
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.include "atari.inc"
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TRAK_BALL = 0 ; device Atari trak-ball
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ST_MOUSE = 1 ; device ST mouse
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AMIGA_MOUSE = 2 ; device Amiga mouse
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MAX_TYPE = 3 ; first illegal device type
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; the default values force the mouse cursor inside the test screen (no access to border)
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defxmin = 48 ; default x minimum
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defymin = 31 ; default y minimum
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defxmax = 204 ; default x maximum
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defymax = 211 ; default y maximum
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pmsize = 16 ; y size pm shape
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xinit = defxmin ; init. x pos.
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yinit = defymin ; init. y pos.
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;--------------------------------------------------------------------
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; reserve memory for the mouse pointer
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initmouse:
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lda APPMHI+1
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and #%11111000 ; make 2k aligned
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sec
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sbc #%00001000 ; reserve 2k
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tax
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adc #3 ; add 4 (C = 1)
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sta mouse_pm0
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lda #0
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sta APPMHI
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stx APPMHI+1
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rts
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;--------------------------------------------------------------------
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; Initialize mouse routines
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; void __fastcall__ mouse_init (unsigned char type);
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_mouse_init:
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cmp #MAX_TYPE+1 ; Check for a valid type
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bcc setup
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ifail: lda #0 ; init. failed
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tax
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rts
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setup: tax
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lda lvectab,x
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sta mouse_vec+1
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lda hvectab,x
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sta mouse_vec+2
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jsr pminit
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lda VTIMR1
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sta old_t1
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lda VTIMR1+1
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sta old_t1+1
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lda #<t1_vec
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sta VTIMR1
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lda #>t1_vec
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sta VTIMR1+1
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lda #%00000001
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sta AUDCTL
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lda #0
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sta AUDC1
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lda #15
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sta AUDF1
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sta STIMER
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sei
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lda POKMSK
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ora #%00000001 ; timer 1 enable
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sta POKMSK
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sta IRQEN
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cli
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lda VVBLKI
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sta vbi_jmp+1
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lda VVBLKI+1
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sta vbi_jmp+2
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lda #6
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ldy #<vbi
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ldx #>vbi
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jsr SETVBV
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lda #$C0
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sta NMIEN
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ldx #0
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lda #1
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sta mouse_off
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rts
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;--------------------------------------------------------------------
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; Finish mouse routines
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; void mouse_done(void)
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_mouse_done:
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sei
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lda POKMSK
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and #%11111110 ; timer 1 disable
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sta IRQEN
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sta POKMSK
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cli
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lda old_t1
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sta VTIMR1
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lda old_t1+1
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sta VTIMR1+1
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lda #$40
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sta NMIEN
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lda #6
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ldy vbi_jmp+1
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ldx vbi_jmp+2
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jsr SETVBV
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ldx #0
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stx GRACTL
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stx HPOSP0
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inx
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stx mouse_off
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rts
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;--------------------------------------------------------------------
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; Set mouse limits
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; void __fastcall__ mouse_box(int xmin, int ymin, int xmax, int ymax)
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_mouse_box:
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sta ymax
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jsr popax ; always ignore high byte
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sta xmax
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jsr popax
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sta ymin
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jsr popax
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sta xmin
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rts
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;--------------------------------------------------------------------
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; Set mouse position
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; void __fastcall__ mouse_move(int xpos, int ypos)
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_mouse_move:
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sta mousey ; always ignore high byte
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jsr popax
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sta mousex
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rts
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;--------------------------------------------------------------------
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; Show mouse arrow
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; void mouse_show(void)
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_mouse_show:
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lda mouse_off ; Already on?
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beq @L1
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dec mouse_off
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@L1: rts
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;--------------------------------------------------------------------
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; Hide mouse arrow
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; void mouse_hide(void)
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_mouse_hide:
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inc mouse_off
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rts
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;--------------------------------------------------------------------
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; Ask mouse button
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; unsigned char mouse_buttons(void)
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_mouse_buttons:
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ldx #0
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lda STRIG0
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bne nobut
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; lda #14
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;??? sta COLOR1
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lda #1
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rts
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nobut: txa
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rts
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;--------------------------------------------------------------------
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; Get the mouse position
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; void mouse_pos (struct mouse_pos* pos);
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_mouse_pos:
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sta ptr1
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stx ptr1+1 ; Store argument pointer
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ldy #0
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lda mousex ; X position
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sta (ptr1),y
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lda #0
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iny
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sta (ptr1),y
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lda mousey ; Y position
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iny
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sta (ptr1),y
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lda #0
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iny
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sta (ptr1),y
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rts
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;--------------------------------------------------------------------
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; Get the mouse position and button information
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; void mouse_info (struct mouse_info* info);
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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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; Atari trak-ball check, A,Y = 4-bit port value
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trak_check:
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eor oldval
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and #%00001000
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beq horiz
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tya
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and #%00000100
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beq mmup
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inc mousey
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bne horiz
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mmup: dec mousey
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horiz: tya
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eor oldval
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and #%00000010
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beq mmexit
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tya
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and #%00000001
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beq mmleft
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inc mousex
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bne mmexit
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mmleft: dec mousex
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mmexit: sty oldval
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rts
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;--------------------------------------------------------------------
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; ST mouse check, A,Y = 4-bit port value
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st_check:
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and #%00000011
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ora dumx
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tax
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lda sttab,x
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bmi nxst
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beq xist
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dec mousex ; 1 = left
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bne nxst
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xist: inc mousex ; 0 = right
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nxst: tya
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and #%00001100
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ora dumy
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tax
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lda sttab,x
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bmi nyst
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bne yst
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dec mousey ; 0 = up
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bne nyst
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yst: inc mousey ; 1 = down
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; store old readings
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nyst: tya
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and #%00000011
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asl
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asl
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sta dumx
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tya
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and #%00001100
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lsr
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lsr
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sta dumy
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rts
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;--------------------------------------------------------------------
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; Amiga mouse check, A,Y = 4-bit port value
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amiga_check:
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lsr
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and #%00000101
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ora dumx
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tax
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lda amitab,x
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bmi nxami
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bne xiami
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dec mousex ; 0 = left
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bne nxami
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xiami: inc mousex ; 1 = right
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nxami: tya
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and #%00000101
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ora dumy
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tax
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lda amitab,x
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bmi nyami
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bne yiami
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dec mousey ; 0 = up
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bne nyami
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yiami: inc mousey ; 1 = down
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; store old readings
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nyami: tya
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and #%00001010
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sta dumx
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tya
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and #%00000101
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asl
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sta dumy
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rts
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;--------------------------------------------------------------------
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; timer 1 IRQ routine - check mouse
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t1_vec: tya
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pha
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txa
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pha
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.ifdef DEBUG
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lda RANDOM
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sta COLBK ; debug
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.endif
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lda PORTA
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tay
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mouse_vec:
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jsr st_check ; will be modified; won't be ROMmable
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pla
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tax
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pla
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tay
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pla
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rti
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;--------------------------------------------------------------------
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; VBI - check mouse limits and display mouse arrow
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vbi: lda mousex
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cmp xmin
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bcs ok1 ; xmin <= mousex
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lda xmin
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sta mousex
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ok1: lda mousey
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cmp ymin
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bcs ok2 ; ymin <= mousey
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lda ymin
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sta mousey
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ok2: lda xmax
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cmp mousex
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bcs ok3 ; xmax >= mousex
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lda xmax
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sta mousex
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ok3: lda ymax
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cmp mousey
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bcs ok4 ; ymax >= mousey
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lda ymax
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sta mousey
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ok4: jsr clrpm
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lda mouse_off
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beq mon
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lda #0
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sta HPOSP0
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beq moff
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mon: jsr drwpm
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lda mousey
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sta omy
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lda #3
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moff: sta GRACTL
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vbi_jmp:
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jmp SYSVBV ; will be modified; won't be ROMmable
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;--------------------------------------------------------------------
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; initialize mouse pm
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pminit: lda mouse_pm0
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sta mpatch1+2
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sta mpatch2+2
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sta mpatch3+2
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ldx #0
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txa
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mpatch1:
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clpm: sta $1000,x ; will be patched
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inx
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bne clpm
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lda mouse_pm0
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sec
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sbc #4
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sta PMBASE
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lda #62
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sta SDMCTL
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lda #1
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sta GPRIOR
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lda #0
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sta PCOLR0
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sta SIZEP0
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rts
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;--------------------------------------------------------------------
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; draw new mouse pm
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drwpm: lda mousex
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sta HPOSP0
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lda mousey
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tax
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ldy #0
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fmp2: lda mskpm,y
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mpatch2:
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sta $1000,x ; will be patched
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inx
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iny
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cpy #pmsize
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bne fmp2
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rts
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;--------------------------------------------------------------------
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; clear old mouse pm
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clrpm: lda omy
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tax
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ldy #0
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tya
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mpatch3:
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fmp1: sta $1000,x ; will be patched
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inx
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iny
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cpy #pmsize
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bne fmp1
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rts
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;--------------------------------------------------------------------
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.rodata
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; mouse arrow - pm shape
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mskpm: .byte %00000000
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.byte %10000000
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.byte %11000000
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.byte %11000000
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.byte %11100000
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.byte %11100000
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.byte %11110000
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.byte %11100000
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.byte %11100000
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.byte %00100000
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.byte %00100000
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.byte %00110000
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.byte %00110000
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.byte %00000000
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.byte %00000000
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.byte %00000000
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; ST mouse lookup table
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sttab: .byte $FF,$01,$00,$01
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.byte $00,$FF,$00,$01
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.byte $01,$00,$FF,$00
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.byte $01,$00,$01,$FF
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; Amiga mouse lookup table
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amitab: .byte $FF,$01,$00,$FF
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.byte $00,$FF,$FF,$01
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.byte $01,$FF,$FF,$00
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.byte $FF,$00,$01,$FF
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; Device vectors
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lvectab:
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.byte <trak_check, <st_check, <amiga_check
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hvectab:
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.byte >trak_check, >st_check, >amiga_check
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; default values
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xmin: .byte defxmin
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ymin: .byte defymin
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xmax: .byte defxmax
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ymax: .byte defymax
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mousex: .byte xinit
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mousey: .byte yinit
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;--------------------------------------------------------------------
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.bss
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; Misc. vars
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old_t1: .res 2 ; old timer interrupt vector
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oldval: .res 1 ; used by trakball routines
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dumx: .res 1
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dumy: .res 1
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omy: .res 1 ; old y pos
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mouse_off:
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.res 1
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mouse_pm0:
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.res 1
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