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https://github.com/deater/dos33fsprogs.git
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199 lines
2.8 KiB
ArmAsm
199 lines
2.8 KiB
ArmAsm
;license:MIT
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;(c) 2023 by 4am
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;
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; drawing routines for Million Perfect Tiles Condensed
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;
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; Public functions:
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; - draw_condensed_1x8
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;
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; VMW: commented, reformatted, minor changes, ca65 assembly
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; hacked up some more
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FONT_OFFSET = $13
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;------------------------------------------------------------------------------
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; draw_condensed_1x8
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;
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; in: A/Y points to zero terminated string, with x-pos and y-pos at start
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; out: clobbers all registers & flags
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;------------------------------------------------------------------------------
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draw_condensed_1x8:
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; store the string location
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sta OUTL
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sty OUTH
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draw_condensed_1x8_again:
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ldy #0
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lda (OUTL),Y
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sta CH
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bpl still_good
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demo_demo_done:
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; FIXME: stop music?
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jmp demo_demo_done
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still_good:
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clc
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lda #1
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adc OUTL
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sta OUTL
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sta dcb_loop_1x8_smc+1
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lda #0
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adc OUTH
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sta OUTH
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sta dcb_loop_1x8_smc+2
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ldy CV
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; row0
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lda hposn_low, Y ; get low memory offset
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clc
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adc CH ; add in x-coord
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sta dcb_row_1x8_0+4
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lda hposn_high, Y ; get high memory offset
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sta dcb_row_1x8_0+5 ; save it out
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iny ; go to next row
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; row1
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lda hposn_low, Y
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adc CH
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sta dcb_row_1x8_1+4
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lda hposn_high, Y
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sta dcb_row_1x8_1+5
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iny
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; row2
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lda hposn_low, Y
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adc CH
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sta dcb_row_1x8_2+4
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lda hposn_high, Y
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sta dcb_row_1x8_2+5
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iny
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; row3
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lda hposn_low, Y
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adc CH
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sta dcb_row_1x8_3+4
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lda hposn_high, Y
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sta dcb_row_1x8_3+5
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iny
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; row4
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lda hposn_low, Y
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adc CH
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sta dcb_row_1x8_4+4
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lda hposn_high, Y
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sta dcb_row_1x8_4+5
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iny
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; row5
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lda hposn_low, Y
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adc CH
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sta dcb_row_1x8_5+4
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lda hposn_high, Y
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sta dcb_row_1x8_5+5
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iny
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; row6
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lda hposn_low, Y
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adc CH
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sta dcb_row_1x8_6+4
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lda hposn_high, Y
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sta dcb_row_1x8_6+5
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iny
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; row7
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lda hposn_low, Y
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adc CH
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sta dcb_row_1x8_7+4
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lda hposn_high, Y
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sta dcb_row_1x8_7+5
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ldx #0
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dcb_loop_1x8:
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dcb_loop_1x8_smc:
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ldy $FDFD, X ; load next char into Y
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beq dcb_done_1x8
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; cpy #13
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; bne not_linefeed
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; lda #0
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; sta CH
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; clc
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; lda CV
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; adc #8
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; sta CV
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; inx
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; lda CV
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; cmp #192
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; bcc dcb_loop_1x8
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; lda #184
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; sta CV
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; stx XSAVE
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; jsr scroll_screen
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; ldx XSAVE
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; jmp dcb_loop_1x8
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not_linefeed:
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; unrolled loop to write out each line
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dcb_row_1x8_0:
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lda font_1x8_row0-FONT_OFFSET, Y ; get 1-byte font row
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sta $FDFD, X ; write out to graphics mem
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dcb_row_1x8_1:
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lda font_1x8_row1-FONT_OFFSET, Y
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sta $FDFD, X
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dcb_row_1x8_2:
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lda font_1x8_row2-FONT_OFFSET, Y
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sta $FDFD, X
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dcb_row_1x8_3:
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lda font_1x8_row3-FONT_OFFSET, Y
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sta $FDFD, X
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dcb_row_1x8_4:
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lda font_1x8_row4-FONT_OFFSET, Y
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sta $FDFD, X
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dcb_row_1x8_5:
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lda font_1x8_row5-FONT_OFFSET, Y
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sta $FDFD, X
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dcb_row_1x8_6:
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lda font_1x8_row6-FONT_OFFSET, Y
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sta $FDFD, X
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dcb_row_1x8_7:
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lda font_1x8_row7-FONT_OFFSET, Y
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sta $FDFD, X
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inc CH
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inx ; move to next
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bne dcb_loop_1x8 ; bra (well, as long as string
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; is less than 255 chars)
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dcb_done_1x8:
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rts
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