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268 lines
4.8 KiB
Lua
268 lines
4.8 KiB
Lua
; Prog8 definitions for the Text I/O and Screen routines for the CommanderX16
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;
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; Written by Irmen de Jong (irmen@razorvine.net) - license: GNU GPL 3.0
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;
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; indent format: TABS, size=8
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%import cx16lib
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%import conv
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txt {
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asmsub clear_screen (ubyte char @ A, ubyte txtcolor @ Y) clobbers(A) {
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; ---- clear the character screen with the given fill character and character color.
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%asm {{
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brk ; TODO
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}}
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}
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ubyte[16] color_to_charcode = [$90,$05,$1c,$9f,$9c,$1e,$1f,$9e,$81,$95,$96,$97,$98,$99,$9a,$9b]
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sub color (ubyte txtcol) {
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c64.CHROUT(color_to_charcode[txtcol & 15])
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}
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sub color2 (ubyte txtcol, ubyte bgcol) {
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c64.CHROUT(color_to_charcode[bgcol & 15])
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c64.CHROUT(1) ; switch fg and bg colors
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c64.CHROUT(color_to_charcode[txtcol & 15])
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}
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asmsub print (str text @ AY) clobbers(A,Y) {
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; ---- print null terminated string from A/Y
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; note: the compiler contains an optimization that will replace
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; a call to this subroutine with a string argument of just one char,
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; by just one call to c64.CHROUT of that single char.
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%asm {{
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sta P8ZP_SCRATCH_B1
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sty P8ZP_SCRATCH_REG
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ldy #0
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- lda (P8ZP_SCRATCH_B1),y
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beq +
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jsr c64.CHROUT
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iny
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bne -
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+ rts
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}}
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}
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asmsub print_ub0 (ubyte value @ A) clobbers(A,Y) {
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; ---- print the ubyte in A in decimal form, with left padding 0s (3 positions total)
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%asm {{
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phx
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jsr conv.ubyte2decimal
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pha
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tya
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jsr c64.CHROUT
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pla
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jsr c64.CHROUT
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txa
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jsr c64.CHROUT
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plx
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rts
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}}
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}
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asmsub print_ub (ubyte value @ A) clobbers(A,Y) {
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; ---- print the ubyte in A in decimal form, without left padding 0s
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%asm {{
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phx
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jsr conv.ubyte2decimal
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_print_byte_digits
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pha
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cpy #'0'
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beq +
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tya
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jsr c64.CHROUT
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pla
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jsr c64.CHROUT
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jmp _ones
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+ pla
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cmp #'0'
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beq _ones
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jsr c64.CHROUT
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_ones txa
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jsr c64.CHROUT
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plx
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rts
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}}
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}
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asmsub print_b (byte value @ A) clobbers(A,Y) {
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; ---- print the byte in A in decimal form, without left padding 0s
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%asm {{
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phx
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pha
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cmp #0
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bpl +
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lda #'-'
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jsr c64.CHROUT
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+ pla
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jsr conv.byte2decimal
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jsr print_ub._print_byte_digits
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plx
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rts
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}}
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}
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asmsub print_ubhex (ubyte value @ A, ubyte prefix @ Pc) clobbers(A,Y) {
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; ---- print the ubyte in A in hex form (if Carry is set, a radix prefix '$' is printed as well)
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%asm {{
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phx
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bcc +
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pha
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lda #'$'
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jsr c64.CHROUT
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pla
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+ jsr conv.ubyte2hex
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jsr c64.CHROUT
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tya
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jsr c64.CHROUT
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plx
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rts
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}}
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}
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asmsub print_ubbin (ubyte value @ A, ubyte prefix @ Pc) clobbers(A,Y) {
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; ---- print the ubyte in A in binary form (if Carry is set, a radix prefix '%' is printed as well)
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%asm {{
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phx
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sta P8ZP_SCRATCH_B1
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bcc +
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lda #'%'
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jsr c64.CHROUT
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+ ldy #8
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- lda #'0'
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asl P8ZP_SCRATCH_B1
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bcc +
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lda #'1'
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+ jsr c64.CHROUT
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dey
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bne -
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plx
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rts
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}}
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}
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asmsub print_uwbin (uword value @ AY, ubyte prefix @ Pc) clobbers(A,Y) {
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; ---- print the uword in A/Y in binary form (if Carry is set, a radix prefix '%' is printed as well)
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%asm {{
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pha
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tya
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jsr print_ubbin
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pla
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clc
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jmp print_ubbin
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}}
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}
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asmsub print_uwhex (uword value @ AY, ubyte prefix @ Pc) clobbers(A,Y) {
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; ---- print the uword in A/Y in hexadecimal form (4 digits)
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; (if Carry is set, a radix prefix '$' is printed as well)
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%asm {{
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pha
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tya
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jsr print_ubhex
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pla
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clc
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jmp print_ubhex
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}}
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}
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asmsub print_uw0 (uword value @ AY) clobbers(A,Y) {
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; ---- print the uword in A/Y in decimal form, with left padding 0s (5 positions total)
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%asm {{
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phx
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jsr conv.uword2decimal
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ldy #0
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- lda conv.uword2decimal.decTenThousands,y
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beq +
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jsr c64.CHROUT
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iny
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bne -
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+ plx
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rts
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}}
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}
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asmsub print_uw (uword value @ AY) clobbers(A,Y) {
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; ---- print the uword in A/Y in decimal form, without left padding 0s
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%asm {{
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phx
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jsr conv.uword2decimal
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plx
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ldy #0
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- lda conv.uword2decimal.decTenThousands,y
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beq _allzero
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cmp #'0'
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bne _gotdigit
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iny
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bne -
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_gotdigit
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jsr c64.CHROUT
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iny
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lda conv.uword2decimal.decTenThousands,y
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bne _gotdigit
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rts
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_allzero
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lda #'0'
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jmp c64.CHROUT
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}}
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}
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asmsub print_w (word value @ AY) clobbers(A,Y) {
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; ---- print the (signed) word in A/Y in decimal form, without left padding 0's
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%asm {{
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cpy #0
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bpl +
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pha
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lda #'-'
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jsr c64.CHROUT
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tya
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eor #255
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tay
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pla
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eor #255
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clc
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adc #1
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bcc +
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iny
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+ jmp print_uw
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}}
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}
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sub setchr (ubyte column, ubyte row, ubyte char) {
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; ---- set char at the given position on the screen
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; plot(column, row)
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c64.CHROUT(char)
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; %asm {{
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; phx
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; ldy column
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; ldx row
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; clc
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; jsr c64.PLOT
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; plx
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; lda char
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; jmp c64.CHROUT
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; }}
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}
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asmsub plot (ubyte col @ Y, ubyte row @ A) clobbers(A) {
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; ---- safe wrapper around PLOT kernel routine, to save the X register.
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%asm {{
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phx
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tax
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clc
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jsr c64.PLOT
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plx
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rts
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}}
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}
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}
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