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https://github.com/cc65/cc65.git
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56b6dcf814
The mouse driver source code in question was removed two years
ago with commit 6cbbe66c87.
It seems however desirable to have it around visible in the source
code tree for reference purposes.
577 lines
9.2 KiB
Plaintext
577 lines
9.2 KiB
Plaintext
;--------------------------------------------------------------------
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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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