mirror of
https://github.com/cc65/cc65.git
synced 2024-10-30 12:28:25 +00:00
13482984ca
About all CONIO functions offering a <...>xy variant call popa _gotoxy By providing an internal gotoxy variant that starts with a popa all those CONIO function can be shortened by 3 bytes. As soon as program calls more than one CONIO function this means an overall code size reduction.
205 lines
4.9 KiB
ArmAsm
205 lines
4.9 KiB
ArmAsm
;
|
|
; Groepaz/Hitmen, 19.10.2015
|
|
;
|
|
; high level implementation for the monochrome soft80 implementation
|
|
;
|
|
; void cputcxy (unsigned char x, unsigned char y, char c);
|
|
; void cputc (char c);
|
|
;
|
|
|
|
.export soft80mono_cputcxy, soft80mono_cputc
|
|
.export soft80mono_cputdirect, soft80mono_putchar
|
|
.export soft80mono_newline, soft80mono_plot
|
|
|
|
.import gotoxy
|
|
|
|
.import soft80mono_kplot
|
|
.import soft80mono_internal_bgcolor, soft80mono_internal_cellcolor
|
|
.import soft80mono_internal_cursorxlsb, soft80mono_internal_nibble
|
|
|
|
.importzp tmp4, tmp3, ptr2
|
|
|
|
.include "c64.inc"
|
|
.include "soft80.inc"
|
|
|
|
soft80mono_cputcxy:
|
|
pha ; Save C
|
|
jsr gotoxy ; Set cursor, drop x and y
|
|
pla ; Restore C
|
|
|
|
; Plot a character - also used as internal function
|
|
|
|
soft80mono_cputc:
|
|
cmp #$0A ; CR?
|
|
bne L1
|
|
|
|
lda #0
|
|
sta CURS_X
|
|
|
|
; Set cursor position, calculate RAM pointers
|
|
soft80mono_plot:
|
|
ldx CURS_Y
|
|
ldy CURS_X
|
|
clc
|
|
jmp soft80mono_kplot ; Set the new cursor
|
|
|
|
L1: cmp #$0D ; LF?
|
|
beq soft80mono_newline ; Recalculate pointers
|
|
|
|
; shortcut for codes < $80 ... codes $20-$7f can be printed directly,
|
|
; codes $00-$1f are control codes which are not printable and thus may
|
|
; give undefined result.
|
|
tay
|
|
bpl @L10
|
|
|
|
; codes $80-$ff must get converted like this:
|
|
; $80-$9f -> dont care (control codes)
|
|
; $a0-$bf -> $00-$1f
|
|
; $c0-$df -> $60-$7f
|
|
; $e0-$ff -> $00-$1f
|
|
|
|
ora #%01000000 ; $40
|
|
clc
|
|
adc #%00100000 ; $20
|
|
and #%01111111 ; $7f
|
|
@L10:
|
|
|
|
; entry point for direct output of a character. the value passed in
|
|
; akku must match the offset in the charset.
|
|
; - the following may not modify tmp1
|
|
soft80mono_cputdirect:
|
|
jsr soft80mono_putchar ; Write the character to the screen
|
|
|
|
; Advance cursor position
|
|
iny ; contains CURS_X
|
|
cpy #charsperline
|
|
beq @L3
|
|
|
|
sty CURS_X
|
|
tya
|
|
and #$01
|
|
sta soft80mono_internal_cursorxlsb
|
|
bne @L4
|
|
|
|
lda SCREEN_PTR
|
|
clc
|
|
adc #8
|
|
sta SCREEN_PTR
|
|
bcc @L4
|
|
inc SCREEN_PTR+1
|
|
@L4:
|
|
rts
|
|
@L3:
|
|
inc CURS_Y ; new line
|
|
ldy #0 ; + cr
|
|
sty CURS_X
|
|
jmp soft80mono_plot
|
|
|
|
; - the following may not modify tmp1
|
|
soft80mono_newline:
|
|
|
|
lda SCREEN_PTR
|
|
clc
|
|
adc #<(40*8)
|
|
sta SCREEN_PTR
|
|
|
|
lda SCREEN_PTR+1
|
|
adc #>(40*8)
|
|
sta SCREEN_PTR+1
|
|
|
|
inc CURS_Y
|
|
rts
|
|
|
|
;-------------------------------------------------------------------------------
|
|
; output one character in internal encoding without advancing cursor position
|
|
; generic entry point
|
|
;
|
|
; - the following may not modify tmp1
|
|
; in: A: charcode
|
|
; out: Y: CURS_X
|
|
;
|
|
soft80mono_putchar:
|
|
sta tmp3 ; save charcode
|
|
|
|
sei
|
|
lda $01
|
|
pha
|
|
lda #$34
|
|
sta $01 ; enable RAM under I/O
|
|
|
|
ldy #$00 ; will be $00 from now on
|
|
|
|
ldx soft80mono_internal_cursorxlsb
|
|
lda chardatal,x
|
|
clc
|
|
adc tmp3
|
|
sta ptr2
|
|
lda chardatah,x
|
|
adc #0
|
|
sta ptr2+1
|
|
|
|
lda RVS
|
|
bne draw_charinvers
|
|
|
|
lda nibble,x
|
|
sta tmp3
|
|
|
|
;ldy #0 ; is still $00
|
|
@lp1:
|
|
lda (SCREEN_PTR),y
|
|
and tmp3
|
|
ora (ptr2),y
|
|
sta (SCREEN_PTR),y
|
|
clc
|
|
lda ptr2
|
|
adc #$7f
|
|
sta ptr2
|
|
bcc @sk1
|
|
inc ptr2+1
|
|
@sk1:
|
|
iny
|
|
cpy #8
|
|
bne @lp1
|
|
|
|
draw_back:
|
|
pla
|
|
sta $01
|
|
cli
|
|
|
|
ldy CURS_X
|
|
rts
|
|
|
|
; output inverted character
|
|
draw_charinvers:
|
|
lda soft80mono_internal_nibble,x
|
|
sta tmp3
|
|
|
|
;ldy #0 ; is still $00
|
|
@lp1:
|
|
lda (SCREEN_PTR),y
|
|
ora tmp3
|
|
eor (ptr2),y
|
|
sta (SCREEN_PTR),y
|
|
clc
|
|
lda ptr2
|
|
adc #$7f
|
|
sta ptr2
|
|
bcc @sk1
|
|
inc ptr2+1
|
|
@sk1:
|
|
iny
|
|
cpy #8
|
|
bne @lp1
|
|
jmp draw_back
|
|
|
|
.rodata
|
|
chardatal:
|
|
.byte <soft80_hi_charset
|
|
.byte <soft80_lo_charset
|
|
chardatah:
|
|
.byte >soft80_hi_charset
|
|
.byte >soft80_lo_charset
|
|
nibble:
|
|
.byte $0f, $f0
|
|
|