mirror of
https://github.com/cc65/cc65.git
synced 2024-11-19 21:32:19 +00:00
420 lines
8.4 KiB
ArmAsm
420 lines
8.4 KiB
ArmAsm
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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 soft80_cputcxy, soft80_cputc
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.export soft80_cputdirect, soft80_putchar
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.export putcolor ; FIX/CHECK
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.export soft80_newline, soft80_plot
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.import popa, _gotoxy
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.import xsize
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.import PLOT ; FIX/CHECK
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.importzp tmp4,tmp3
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.import __bgcolor ; FIX/CHECK
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.macpack longbranch
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.include "c64.inc"
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.include "soft80.inc"
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soft80_cputcxy:
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pha ; Save C
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jsr popa ; Get Y
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jsr _gotoxy ; Set cursor, drop x
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pla ; Restore C
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; Plot a character - also used as internal function
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soft80_cputc:
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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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; Set cursor position, calculate RAM pointers
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soft80_plot:
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ldx CURS_Y
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ldy CURS_X
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clc
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jmp PLOT ; Set the new cursor
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L1: cmp #$0D ; LF?
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beq soft80_newline ; Recalculate pointers
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; Printable char of some sort
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tay
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bpl L10
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clc
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adc #$20
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and #$7F
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L10:
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soft80_cputdirect:
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jsr soft80_putchar ; Write the character to the screen
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; Advance cursor position
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advance:
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iny
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cpy #charsperline
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beq L3
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sty CURS_X
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tya
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and #$01
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bne @L5
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lda SCREEN_PTR
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clc
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adc #8
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sta SCREEN_PTR
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bcc @L4
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inc SCREEN_PTR+1
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@L4:
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inc CRAM_PTR
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bne @L5
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inc CRAM_PTR+1
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@L5:
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rts
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L3:
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inc CURS_Y ; new line
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ldy #0 ; + cr
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sty CURS_X
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jmp soft80_plot
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soft80_newline:
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lda SCREEN_PTR
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clc
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adc #<(40*8)
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sta SCREEN_PTR
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lda SCREEN_PTR+1
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adc #>(40*8)
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sta SCREEN_PTR+1
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lda CRAM_PTR
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clc
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adc #40
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sta CRAM_PTR
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bcc L5
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inc CRAM_PTR+1
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L5:
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inc CURS_Y
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rts
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; Write one character to the screen without doing anything else
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; in: A: character
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; returns: Y: cursor X position
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; this function is going to be used a lot so we unroll it a bit for speed
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;--- start color vodoo
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; remove color from cell
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; y unmodified
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remcolor:
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;ldy #$00 ; is still $00
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lda (CRAM_PTR),y ; vram
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and #$0f
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cmp __bgcolor
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jeq @l2b ; vram==bgcolor
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inc $01
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lda (CRAM_PTR),y ; colram
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stx $01 ;$34
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and #$0f
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cmp __bgcolor
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beq @l2s ; colram==bgcolor
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; vram = colram
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;inc $01
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;lda (CRAM_PTR),y ; colram
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;stx $01 ;$34
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;and #$0f
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sta tmp3
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lda (CRAM_PTR),y ; vram
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and #$f0
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ora tmp3
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sta (CRAM_PTR),y ; vram
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; colram = bgcolor
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lda __bgcolor
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inc $01
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sta (CRAM_PTR),y ; colram
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stx $01 ;$34
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jmp @l2b
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@l2s:
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; colram is bgcolor
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; => only one char in cell used
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jsr soft80_checkchar
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bcc @l2b ; space at current position
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; vram = bgcolor
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lda (CRAM_PTR),y ; vram
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and #$f0
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ora __bgcolor
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sta (CRAM_PTR),y ; vram
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@l2b:
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rts
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; put color to cell
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; y unmodified
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putcolor:
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;ldy #$00 ; is still $00
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lda (CRAM_PTR),y ; vram
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and #$0f
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cmp __bgcolor
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beq @l2s ; vram==bgcolor => first char in cell
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; vram!=bgcolor => second char in cell
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inc $01 ;$35
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lda (CRAM_PTR),y ; colram
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stx $01 ;$34
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and #$0f
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cmp __bgcolor
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bne @l2s ; colram!=bgcolor
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; colram==bgcolor => second char in cell or overwrite 1st char
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jsr soft80_checkchar
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bcs @l2a ; char at current position => overwrite 1st
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; colram=vram
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lda (CRAM_PTR),y ; vram
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inc $01
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sta (CRAM_PTR),y ; colram
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stx $01 ;$34
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;jmp @l2a
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@l2s:
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; colram!=bgcolor => alread 2 chars in cell
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@l2a:
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; Set color
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lda CHARCOLOR
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sta (CRAM_PTR),y ; vram
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rts
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;--- end color vodoo
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.export soft80_checkchar
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; test if there is a space or a character at current position
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; CLC: space SEC: character
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soft80_checkchar:
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;ldy #$00 ; is still $00
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lda CURS_X
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and #$01
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jne @l1a
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.repeat 8,line
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lda (SCREEN_PTR),y
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and #$f0
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cmp #$f0
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bne @l2b
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.if (line < 7)
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iny
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.endif
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.endrepeat
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ldy #$00
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clc
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rts
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@l2b:
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ldy #$00
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sec
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rts
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@l1a:
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.repeat 8,line
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lda (SCREEN_PTR),y
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and #$0f
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cmp #$0f
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bne @l2bb
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.if line < 7
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iny
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.endif
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.endrepeat
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ldy #$00
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clc
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rts
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@l2bb:
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ldy #$00
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sec
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rts
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; output space
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_space:
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lda RVS
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jne _spaceinvers
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jsr remcolor
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;ldy #$00 ; is still $00
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lda CURS_X
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and #$01
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bne @l1
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.repeat 8,line
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lda (SCREEN_PTR),y
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ora #$f0
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sta (SCREEN_PTR),y
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.if (line < 7)
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iny
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.endif
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.endrepeat
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jmp _back
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@l1:
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.repeat 8,line
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lda (SCREEN_PTR),y
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ora #$0f
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sta (SCREEN_PTR),y
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.if line < 7
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iny
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.endif
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.endrepeat
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@l2:
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jmp _back
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; output inverted space
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_spaceinvers:
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jsr putcolor
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lda CURS_X
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and #$01
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bne @l1
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.repeat 8,line
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lda (SCREEN_PTR),y
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and #$0f
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sta (SCREEN_PTR),y
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.if line < 7
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iny
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.endif
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.endrepeat
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jmp _back
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@l1:
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.repeat 8,line
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lda (SCREEN_PTR),y
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and #$f0
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sta (SCREEN_PTR),y
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.if line < 7
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iny
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.endif
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.endrepeat
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jmp _back
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; output a character
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soft80_putchar:
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sta tmp3
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sei
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ldx $01
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stx tmp4
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ldx #$34
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stx $01 ; will stay $34 for space
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ldy #$00 ; will be $00 from now on
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cmp #' ' ; space is a special (optimized) case
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jeq _space
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jsr putcolor
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; output character
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char:
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ldx tmp3
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lda RVS
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jne _invers
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lda CURS_X
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and #$01
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bne @l1
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.repeat 8,line
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lda (SCREEN_PTR),y
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and #$0f
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ora soft80_hi_charset+(line*$80),x
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sta (SCREEN_PTR),y
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.if line < 7
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iny
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.endif
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.endrepeat
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jmp @l2
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@l1:
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.repeat 8,line
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lda (SCREEN_PTR),y
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and #$f0
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ora soft80_lo_charset+(line*$80),x
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sta (SCREEN_PTR),y
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.if line < 7
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iny
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.endif
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.endrepeat
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@l2:
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_back:
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lda tmp4
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sta $01
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cli
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ldy CURS_X
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rts
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; output inverted character
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_invers:
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lda CURS_X
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and #$01
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bne @l1
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.repeat 8,line
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lda (SCREEN_PTR),y
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ora #$f0
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eor soft80_hi_charset+(line*$80),x
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sta (SCREEN_PTR),y
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.if line < 7
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iny
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.endif
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.endrepeat
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jmp _back
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@l1:
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.repeat 8,line
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lda (SCREEN_PTR),y
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ora #$0f
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eor soft80_lo_charset+(line*$80),x
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sta (SCREEN_PTR),y
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.if line < 7
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iny
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.endif
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.endrepeat
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jmp _back
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