mirror of
https://github.com/cc65/cc65.git
synced 2024-12-27 00:29:31 +00:00
183 lines
4.7 KiB
PHP
183 lines
4.7 KiB
PHP
;
|
|
; Macro definitions for screen layout modules
|
|
;
|
|
|
|
.include "extzp.inc"
|
|
|
|
.linecont +
|
|
|
|
;
|
|
; Internal function for screensize()
|
|
;
|
|
.macro osi_screensize ScrWidth, ScrHeight
|
|
; Macro implementation of internal screensize
|
|
; function for given width and height in
|
|
; characters
|
|
|
|
.export screensize
|
|
|
|
.proc screensize
|
|
ldx #ScrWidth
|
|
ldy #ScrHeight
|
|
rts
|
|
.endproc
|
|
.endmacro
|
|
|
|
;
|
|
; void clrscr (void);
|
|
;
|
|
.macro osi_clrscr ScrBase, ScrRamSize
|
|
|
|
.export _clrscr
|
|
|
|
.proc _clrscr
|
|
lda #<ScrBase ; Fill whole video RAM with blanks by calling
|
|
ldx #>ScrBase ; memset appropriately
|
|
jsr pushax
|
|
|
|
lda #' '
|
|
ldx #$00
|
|
jsr pushax
|
|
|
|
lda #<ScrRamSize
|
|
ldx #>ScrRamSize
|
|
jsr _memset
|
|
|
|
lda #$00 ; Cursor in upper left corner
|
|
sta CURS_X
|
|
sta CURS_Y
|
|
|
|
jmp plot ; Set the cursor position
|
|
.endproc
|
|
|
|
.endmacro
|
|
|
|
;
|
|
; cputc/cputcxy for Challenger 1P
|
|
; Based on PET/CBM implementation
|
|
;
|
|
|
|
.macro osi_cputfuncs ScrBase, ScrFirstChar, ScrWidth, ScrHeight, \
|
|
ScrollDist, ScrLo, ScrHi
|
|
|
|
; Number of characters to move for scrolling
|
|
; by one line
|
|
ScrollLength = (ScrHeight - 1) * ScrollDist
|
|
|
|
;
|
|
; void cputcxy (unsigned char x, unsigned char y, char c);
|
|
; void cputc (char c);
|
|
;
|
|
.export _cputcxy, _cputc, cputdirect, putchar
|
|
.export newline, plot
|
|
|
|
_cputcxy:
|
|
pha ; Save C
|
|
jsr gotoxy ; Set cursor, drop x and y
|
|
pla ; Restore C
|
|
|
|
; Plot a character - also used as internal function
|
|
|
|
_cputc: cmp #$0A ; CR?
|
|
bne L1
|
|
lda #0
|
|
sta CURS_X
|
|
beq plot ; Recalculate pointers
|
|
|
|
L1: cmp #$0D ; LF?
|
|
beq newline ; Recalculate pointers
|
|
|
|
cputdirect:
|
|
jsr putchar ; Write the character to the screen
|
|
|
|
; Advance cursor position, register Y contains horizontal position after
|
|
; putchar
|
|
|
|
cpy #(ScrWidth - 1) ; Check whether line is full
|
|
bne L3
|
|
jsr newline ; New line
|
|
ldy #$FF ; + cr
|
|
L3: iny
|
|
sty CURS_X
|
|
rts
|
|
|
|
newline:
|
|
inc CURS_Y
|
|
lda CURS_Y
|
|
cmp #ScrHeight ; Screen height
|
|
bne plot
|
|
dec CURS_Y ; Bottom of screen reached, scroll
|
|
|
|
; Scroll destination address
|
|
lda #<(ScrBase + ScrFirstChar)
|
|
ldx #>(ScrBase + ScrFirstChar)
|
|
jsr pushax
|
|
|
|
; Scroll source address
|
|
lda #<(ScrBase + ScrFirstChar + ScrollDist)
|
|
ldx #>(ScrBase + ScrFirstChar + ScrollDist)
|
|
jsr pushax
|
|
|
|
; Number of characters to move
|
|
lda #<ScrollLength
|
|
ldx #>ScrollLength
|
|
jsr _memmove
|
|
|
|
; Address of first character in last line
|
|
; of screen
|
|
lda #<(ScrBase + ScrFirstChar + ScrollLength)
|
|
sta ptr1
|
|
lda #>(ScrBase + ScrFirstChar + ScrollLength)
|
|
sta ptr1+1
|
|
|
|
ldy #ScrWidth ; Fill last line with blanks
|
|
lda #' '
|
|
clrln: sta (ptr1),y
|
|
dey
|
|
bpl clrln
|
|
|
|
plot: ldy CURS_Y
|
|
lda ScrLo,y
|
|
sta SCREEN_PTR
|
|
lda ScrHi,y
|
|
sta SCREEN_PTR+1
|
|
rts
|
|
|
|
; Write one character to the screen without doing anything else, return X
|
|
; position in register Y
|
|
|
|
putchar:
|
|
ldy CURS_X
|
|
sta (SCREEN_PTR),y ; Set char
|
|
rts
|
|
|
|
.endmacro
|
|
|
|
.macro osi_screen_funcs ScrBase, ScrRamSize, ScrFirstChar, \
|
|
ScrWidth, ScrHeight, ScrollDist
|
|
|
|
.import gotoxy
|
|
.import _memmove, _memset, pushax
|
|
.importzp ptr1
|
|
|
|
.rodata
|
|
|
|
; Screen address tables - offset to real screen
|
|
ScrTabLo:
|
|
.repeat ScrHeight, I
|
|
.byte <(ScrBase + ScrFirstChar + I * ScrollDist)
|
|
.endrep
|
|
|
|
ScrTabHi:
|
|
.repeat ScrHeight, I
|
|
.byte >(ScrBase + ScrFirstChar + I * ScrollDist)
|
|
.endrep
|
|
|
|
.code
|
|
|
|
osi_cputfuncs ScrBase, ScrFirstChar, ScrWidth, ScrHeight, \
|
|
ScrollDist, ScrTabLo, ScrTabHi
|
|
osi_screensize ScrWidth, ScrHeight
|
|
osi_clrscr ScrBase, ScrRamSize
|
|
|
|
.endmacro |