; Prog8 definitions for the Text I/O and Screen routines for the Commodore-64 ; ; Written by Irmen de Jong (irmen@razorvine.net) - license: GNU GPL 3.0 ; ; indent format: TABS, size=8 %target c64 %import syslib %import conv txt { const ubyte DEFAULT_WIDTH = 40 const ubyte DEFAULT_HEIGHT = 25 sub clear_screen() { txt.chrout(147) } sub home() { txt.chrout(19) } sub nl() { txt.chrout('\n') } sub spc() { txt.chrout(' ') } asmsub column(ubyte col @A) clobbers(A, X, Y) { ; ---- set the cursor on the given column (starting with 0) on the current line %asm {{ sec jsr c64.PLOT tay clc jmp c64.PLOT }} } asmsub fill_screen (ubyte char @ A, ubyte color @ Y) clobbers(A) { ; ---- fill the character screen with the given fill character and character color. ; (assumes screen and color matrix are at their default addresses) %asm {{ pha tya jsr clear_screencolors pla jsr clear_screenchars rts }} } asmsub clear_screenchars (ubyte char @ A) clobbers(Y) { ; ---- clear the character screen with the given fill character (leaves colors) ; (assumes screen matrix is at the default address) %asm {{ ldy #250 - sta c64.Screen+250*0-1,y sta c64.Screen+250*1-1,y sta c64.Screen+250*2-1,y sta c64.Screen+250*3-1,y dey bne - rts }} } asmsub clear_screencolors (ubyte color @ A) clobbers(Y) { ; ---- clear the character screen colors with the given color (leaves characters). ; (assumes color matrix is at the default address) %asm {{ ldy #250 - sta c64.Colors+250*0-1,y sta c64.Colors+250*1-1,y sta c64.Colors+250*2-1,y sta c64.Colors+250*3-1,y dey bne - rts }} } sub color (ubyte txtcol) { c64.COLOR = txtcol } sub lowercase() { c64.VMCSB |= 2 } sub uppercase() { c64.VMCSB &= ~2 } asmsub scroll_left (ubyte alsocolors @ Pc) clobbers(A, Y) { ; ---- scroll the whole screen 1 character to the left ; contents of the rightmost column are unchanged, you should clear/refill this yourself ; Carry flag determines if screen color data must be scrolled too %asm {{ stx P8ZP_SCRATCH_REG bcc _scroll_screen + ; scroll the screen and the color memory ldx #0 ldy #38 - .for row=0, row<=24, row+=1 lda c64.Screen + 40*row + 1,x sta c64.Screen + 40*row + 0,x lda c64.Colors + 40*row + 1,x sta c64.Colors + 40*row + 0,x .next inx dey bpl - rts _scroll_screen ; scroll only the screen memory ldx #0 ldy #38 - .for row=0, row<=24, row+=1 lda c64.Screen + 40*row + 1,x sta c64.Screen + 40*row + 0,x .next inx dey bpl - ldx P8ZP_SCRATCH_REG rts }} } asmsub scroll_right (ubyte alsocolors @ Pc) clobbers(A) { ; ---- scroll the whole screen 1 character to the right ; contents of the leftmost column are unchanged, you should clear/refill this yourself ; Carry flag determines if screen color data must be scrolled too %asm {{ stx P8ZP_SCRATCH_REG bcc _scroll_screen + ; scroll the screen and the color memory ldx #38 - .for row=0, row<=24, row+=1 lda c64.Screen + 40*row + 0,x sta c64.Screen + 40*row + 1,x lda c64.Colors + 40*row + 0,x sta c64.Colors + 40*row + 1,x .next dex bpl - rts _scroll_screen ; scroll only the screen memory ldx #38 - .for row=0, row<=24, row+=1 lda c64.Screen + 40*row + 0,x sta c64.Screen + 40*row + 1,x .next dex bpl - ldx P8ZP_SCRATCH_REG rts }} } asmsub scroll_up (ubyte alsocolors @ Pc) clobbers(A) { ; ---- scroll the whole screen 1 character up ; contents of the bottom row are unchanged, you should refill/clear this yourself ; Carry flag determines if screen color data must be scrolled too %asm {{ stx P8ZP_SCRATCH_REG bcc _scroll_screen + ; scroll the screen and the color memory ldx #39 - .for row=1, row<=24, row+=1 lda c64.Screen + 40*row,x sta c64.Screen + 40*(row-1),x lda c64.Colors + 40*row,x sta c64.Colors + 40*(row-1),x .next dex bpl - rts _scroll_screen ; scroll only the screen memory ldx #39 - .for row=1, row<=24, row+=1 lda c64.Screen + 40*row,x sta c64.Screen + 40*(row-1),x .next dex bpl - ldx P8ZP_SCRATCH_REG rts }} } asmsub scroll_down (ubyte alsocolors @ Pc) clobbers(A) { ; ---- scroll the whole screen 1 character down ; contents of the top row are unchanged, you should refill/clear this yourself ; Carry flag determines if screen color data must be scrolled too %asm {{ stx P8ZP_SCRATCH_REG bcc _scroll_screen + ; scroll the screen and the color memory ldx #39 - .for row=23, row>=0, row-=1 lda c64.Colors + 40*row,x sta c64.Colors + 40*(row+1),x lda c64.Screen + 40*row,x sta c64.Screen + 40*(row+1),x .next dex bpl - rts _scroll_screen ; scroll only the screen memory ldx #39 - .for row=23, row>=0, row-=1 lda c64.Screen + 40*row,x sta c64.Screen + 40*(row+1),x .next dex bpl - ldx P8ZP_SCRATCH_REG rts }} } romsub $FFD2 = chrout(ubyte char @ A) ; for consistency. You can also use c64.CHROUT directly ofcourse. asmsub print (str text @ AY) clobbers(A,Y) { ; ---- print null terminated string from A/Y ; note: the compiler contains an optimization that will replace ; a call to this subroutine with a string argument of just one char, ; by just one call to c64.CHROUT of that single char. %asm {{ sta P8ZP_SCRATCH_B1 sty P8ZP_SCRATCH_REG ldy #0 - lda (P8ZP_SCRATCH_B1),y beq + jsr c64.CHROUT iny bne - + rts }} } asmsub print_ub0 (ubyte value @ A) clobbers(A,Y) { ; ---- print the ubyte in A in decimal form, with left padding 0s (3 positions total) %asm {{ stx P8ZP_SCRATCH_REG jsr conv.ubyte2decimal pha tya jsr c64.CHROUT pla jsr c64.CHROUT txa jsr c64.CHROUT ldx P8ZP_SCRATCH_REG rts }} } asmsub print_ub (ubyte value @ A) clobbers(A,Y) { ; ---- print the ubyte in A in decimal form, without left padding 0s %asm {{ stx P8ZP_SCRATCH_REG jsr conv.ubyte2decimal _print_byte_digits pha cpy #'0' beq + tya jsr c64.CHROUT pla jsr c64.CHROUT jmp _ones + pla cmp #'0' beq _ones jsr c64.CHROUT _ones txa jsr c64.CHROUT ldx P8ZP_SCRATCH_REG rts }} } asmsub print_b (byte value @ A) clobbers(A,Y) { ; ---- print the byte in A in decimal form, without left padding 0s %asm {{ stx P8ZP_SCRATCH_REG pha cmp #0 bpl + lda #'-' jsr c64.CHROUT + pla jsr conv.byte2decimal jmp print_ub._print_byte_digits }} } asmsub print_ubhex (ubyte value @ A, ubyte prefix @ Pc) clobbers(A,Y) { ; ---- print the ubyte in A in hex form (if Carry is set, a radix prefix '$' is printed as well) %asm {{ stx P8ZP_SCRATCH_REG bcc + pha lda #'$' jsr c64.CHROUT pla + jsr conv.ubyte2hex jsr c64.CHROUT tya jsr c64.CHROUT ldx P8ZP_SCRATCH_REG rts }} } asmsub print_ubbin (ubyte value @ A, ubyte prefix @ Pc) clobbers(A,Y) { ; ---- print the ubyte in A in binary form (if Carry is set, a radix prefix '%' is printed as well) %asm {{ stx P8ZP_SCRATCH_REG sta P8ZP_SCRATCH_B1 bcc + lda #'%' jsr c64.CHROUT + ldy #8 - lda #'0' asl P8ZP_SCRATCH_B1 bcc + lda #'1' + jsr c64.CHROUT dey bne - ldx P8ZP_SCRATCH_REG rts }} } asmsub print_uwbin (uword value @ AY, ubyte prefix @ Pc) clobbers(A,Y) { ; ---- print the uword in A/Y in binary form (if Carry is set, a radix prefix '%' is printed as well) %asm {{ pha tya jsr print_ubbin pla clc jmp print_ubbin }} } asmsub print_uwhex (uword value @ AY, ubyte prefix @ Pc) clobbers(A,Y) { ; ---- print the uword in A/Y in hexadecimal form (4 digits) ; (if Carry is set, a radix prefix '$' is printed as well) %asm {{ pha tya jsr print_ubhex pla clc jmp print_ubhex }} } asmsub print_uw0 (uword value @ AY) clobbers(A,Y) { ; ---- print the uword in A/Y in decimal form, with left padding 0s (5 positions total) %asm {{ stx P8ZP_SCRATCH_REG jsr conv.uword2decimal ldy #0 - lda conv.uword2decimal.decTenThousands,y beq + jsr c64.CHROUT iny bne - + ldx P8ZP_SCRATCH_REG rts }} } asmsub print_uw (uword value @ AY) clobbers(A,Y) { ; ---- print the uword in A/Y in decimal form, without left padding 0s %asm {{ stx P8ZP_SCRATCH_REG jsr conv.uword2decimal ldx P8ZP_SCRATCH_REG ldy #0 - lda conv.uword2decimal.decTenThousands,y beq _allzero cmp #'0' bne _gotdigit iny bne - _gotdigit jsr c64.CHROUT iny lda conv.uword2decimal.decTenThousands,y bne _gotdigit rts _allzero lda #'0' jmp c64.CHROUT }} } asmsub print_w (word value @ AY) clobbers(A,Y) { ; ---- print the (signed) word in A/Y in decimal form, without left padding 0's %asm {{ cpy #0 bpl + pha lda #'-' jsr c64.CHROUT tya eor #255 tay pla eor #255 clc adc #1 bcc + iny + jmp print_uw }} } asmsub input_chars (uword buffer @ AY) clobbers(A) -> ubyte @ Y { ; ---- Input a string (max. 80 chars) from the keyboard. Returns length in Y. (string is terminated with a 0 byte as well) ; It assumes the keyboard is selected as I/O channel! %asm {{ sta P8ZP_SCRATCH_W1 sty P8ZP_SCRATCH_W1+1 ldy #0 ; char counter = 0 - jsr c64.CHRIN cmp #$0d ; return (ascii 13) pressed? beq + ; yes, end. sta (P8ZP_SCRATCH_W1),y ; else store char in buffer iny bne - + lda #0 sta (P8ZP_SCRATCH_W1),y ; finish string with 0 byte rts }} } asmsub setchr (ubyte col @X, ubyte row @Y, ubyte character @A) clobbers(A, Y) { ; ---- sets the character in the screen matrix at the given position %asm {{ pha tya asl a tay lda _screenrows+1,y sta _mod+2 txa clc adc _screenrows,y sta _mod+1 bcc + inc _mod+2 + pla _mod sta $ffff ; modified rts _screenrows .word $0400 + range(0, 1000, 40) }} } asmsub getchr (ubyte col @A, ubyte row @Y) clobbers(Y) -> ubyte @ A { ; ---- get the character in the screen matrix at the given location %asm {{ pha tya asl a tay lda setchr._screenrows+1,y sta _mod+2 pla clc adc setchr._screenrows,y sta _mod+1 bcc _mod inc _mod+2 _mod lda $ffff ; modified rts }} } asmsub setclr (ubyte col @X, ubyte row @Y, ubyte color @A) clobbers(A, Y) { ; ---- set the color in A on the screen matrix at the given position %asm {{ pha tya asl a tay lda _colorrows+1,y sta _mod+2 txa clc adc _colorrows,y sta _mod+1 bcc + inc _mod+2 + pla _mod sta $ffff ; modified rts _colorrows .word $d800 + range(0, 1000, 40) }} } asmsub getclr (ubyte col @A, ubyte row @Y) clobbers(Y) -> ubyte @ A { ; ---- get the color in the screen color matrix at the given location %asm {{ pha tya asl a tay lda setclr._colorrows+1,y sta _mod+2 pla clc adc setclr._colorrows,y sta _mod+1 bcc _mod inc _mod+2 _mod lda $ffff ; modified rts }} } sub setcc (ubyte column, ubyte row, ubyte char, ubyte charcolor) { ; ---- set char+color at the given position on the screen %asm {{ lda row asl a tay lda setchr._screenrows+1,y sta _charmod+2 adc #$d4 sta _colormod+2 lda setchr._screenrows,y clc adc column sta _charmod+1 sta _colormod+1 bcc + inc _charmod+2 inc _colormod+2 + lda char _charmod sta $ffff ; modified lda charcolor _colormod sta $ffff ; modified rts }} } asmsub plot (ubyte col @ Y, ubyte row @ A) clobbers(A) { ; ---- safe wrapper around PLOT kernal routine, to save the X register. %asm {{ stx P8ZP_SCRATCH_REG tax clc jsr c64.PLOT ldx P8ZP_SCRATCH_REG rts }} } asmsub width() clobbers(X,Y) -> ubyte @A { ; -- returns the text screen width (number of columns) %asm {{ jsr c64.SCREEN txa rts }} } asmsub height() clobbers(X, Y) -> ubyte @A { ; -- returns the text screen height (number of rows) %asm {{ jsr c64.SCREEN tya rts }} } }