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