mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-06-29 05:29:36 +00:00
157 lines
1.7 KiB
ArmAsm
157 lines
1.7 KiB
ArmAsm
;================================
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; draw the sorta vectored logo
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;================================
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; 908 bytes -- first display
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; 916 bytes -- scroll down
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show_logo:
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lda #76
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sta LETTER_Y
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logo_loop:
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ldx #7
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jsr HCOLOR1 ; set color
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lda #14
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sta LETTER_X
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lda #<letter_d
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sta INL
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lda #>letter_d
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sta INH
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jsr draw_letter
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lda #62
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sta LETTER_X
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lda #<letter_e
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sta INL
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lda #>letter_e
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sta INH
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jsr draw_letter
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lda #110
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sta LETTER_X
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lda #<letter_s
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sta INL
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lda #>letter_s
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sta INH
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jsr draw_letter
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lda #154
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sta LETTER_X
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lda #<letter_i
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sta INL
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lda #>letter_i
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sta INH
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jsr draw_letter
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lda #176
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sta LETTER_X
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lda #<letter_r
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sta INL
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lda #>letter_r
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sta INH
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jsr draw_letter
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lda #220
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sta LETTER_X
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lda #<letter_e
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sta INL
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lda #>letter_e
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sta INH
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jsr draw_letter
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inc LETTER_Y
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lda LETTER_Y
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cmp #77
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bne logo_loop
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logo_done:
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jmp skip_it
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;========================
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; draw letter
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;========================
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; so inefficient
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; letter to draw in INL:INH
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draw_letter:
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ldy #0 ; iterator
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letter_loop:
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lda (INL),Y
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cmp #$FF
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beq letter_done
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cmp #$8D
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bne hplot_to
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hplot:
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iny
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lda (INL),Y ; get X value
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asl ; need to multiply by 2
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clc
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adc LETTER_X
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tax ; put in X
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iny ; point to Y value
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tya ; save Y value on stack for later
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pha
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lda (INL),Y ; get Y value
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clc
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adc LETTER_Y
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ldy #0 ; set top of X value (FIXME)
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jsr HPLOT0 ; plot at (Y,X), (A)
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pla ; restore pointer
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tay
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iny
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hplot_to:
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lda (INL),Y
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asl
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clc
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adc LETTER_X
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sta TEMP
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lda #0
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adc #0
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tax
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iny
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tya
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pha
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lda (INL),Y
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clc
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adc LETTER_Y
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tay
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lda TEMP
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jsr HGLIN ; line to (X,A),(Y)
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pla
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tay
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iny
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jmp letter_loop
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letter_done:
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rts
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skip_it:
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