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https://github.com/deater/dos33fsprogs.git
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mode7_demo: add scrolling
This commit is contained in:
Vince Weaver
parent
8c79f2b52d
commit
f0a2779fe8
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@ -23,7 +23,8 @@ mode7_demo.o: mode7_demo.s mode7_demo_backgrounds.inc \
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../asm_routines/gr_unrle.s \
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../asm_routines/hlin_clearscreen.s \
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../asm_routines/gr_setpage.s \
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../asm_routines/gr_fade.s
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../asm_routines/gr_fade.s \
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../asm_routines/gr_copy.s
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ca65 -o mode7_demo.o mode7_demo.s -l mode7_demo.lst
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10
mode7_demo/deater_scroll.inc
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10
mode7_demo/deater_scroll.inc
Normal file
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@ -0,0 +1,10 @@
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; Original size = 668 bytes
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deater_scroll:
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; scroll_length:
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.byte 167
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.byte $A0,$28,$00,$20,$20,$A3,$00,$A4,$20,$00,$00,$20,$20,$00,$00,$A3,$20,$00,$A4,$20,$00,$A3,$20,$A7,$00,$40,$A3,$00,$40,$00,$00,$40,$40,$A3,$00,$A3,$40,$A6,$00,$10,$00,$00,$10,$00,$A4,$10,$00,$A3,$10,$00,$00,$A4,$10,$00,$A3,$10,$00,$A3,$10,$00,$A3,$10,$A0,$82,$00
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.byte $A0,$28,$00,$E6,$00,$06,$E0,$00,$E6,$A4,$00,$E6,$00,$00,$E6,$00,$00,$E6,$00,$00,$E6,$A4,$00,$E6,$00,$00,$E6,$A6,$00,$DC,$A3,$00,$DC,$00,$DC,$00,$00,$DC,$00,$DC,$A9,$00,$B3,$00,$00,$B3,$00,$B3,$A4,$00,$B3,$00,$00,$B3,$00,$B3,$A4,$00,$03,$B3,$03,$00,$03,$B3,$03,$00,$03,$B3,$03,$A0,$82,$00
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.byte $A0,$28,$00,$EF,$00,$00,$EF,$00,$EF,$0F,$0F,$00,$00,$EF,$0F,$0F,$EF,$00,$00,$EF,$00,$00,$EF,$0F,$0F,$00,$00,$EF,$0F,$0F,$E0,$A6,$00,$DF,$00,$D0,$00,$DF,$00,$DF,$0F,$0F,$DF,$00,$00,$0F,$0F,$D0,$A6,$00,$BF,$0F,$0F,$BF,$00,$BF,$0F,$0F,$00,$00,$BF,$0F,$0F,$B0,$00,$BF,$0F,$0F,$A3,$00,$0F,$A3,$00,$0F,$A3,$00,$0F,$A0,$83,$00
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.byte $A0,$28,$00,$26,$20,$06,$00,$00,$26,$A3,$20,$00,$26,$00,$00,$26,$00,$00,$26,$00,$00,$26,$A3,$20,$00,$26,$00,$00,$26,$A6,$00,$4C,$0C,$00,$0C,$4C,$00,$4C,$00,$00,$4C,$00,$A3,$40,$0C,$A6,$00,$13,$00,$00,$13,$00,$13,$A3,$10,$00,$13,$00,$00,$13,$00,$13,$A3,$10,$00,$00,$13,$A3,$00,$13,$A3,$00,$13,$A0,$83,$00
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.byte $A1
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; Compressed size = 294 bytes
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@ -25,11 +25,30 @@
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demo_loop:
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;==========
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; Fade in
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;==========
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jsr fade_in
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lda #255
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jsr WAIT
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;==========================================
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; Make sure page0 and page1 show same image
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;==========================================
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jsr gr_copy_to_current
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;===================
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; Scroll the message
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;===================
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; lda #255
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; jsr WAIT
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jsr scroll
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;=============
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; Fade out
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;=============
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jsr fade_out
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@ -45,5 +64,199 @@ demo_loop:
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.include "../asm_routines/gr_setpage.s"
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.include "../asm_routines/pageflip.s"
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.include "../asm_routines/gr_fade.s"
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.include "../asm_routines/gr_copy.s"
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.include "mode7_demo_backgrounds.inc"
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scroll_row1 EQU $8A00
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scroll_row2 EQU $8B00
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scroll_row3 EQU $8C00
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scroll_row4 EQU $8D00
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SCROLL_LENGTH EQU $E6
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scroll:
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lda #0
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sta ANGLE
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;=======================
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; decompress scroll text
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;=======================
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lda #>deater_scroll
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sta INH
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lda #<deater_scroll
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sta INL
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jsr decompress_scroll
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scroll_loop:
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ldx #0
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ldy ANGLE
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lda DISP_PAGE
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beq draw_page2
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lda #4
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sta sm1+2
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sta sm2+2
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lda #5
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sta sm3+2
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sta sm4+2
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jmp draw_done
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draw_page2:
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lda #8
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sta sm1+2
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sta sm2+2
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lda #9
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sta sm3+2
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sta sm4+2
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draw_done:
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draw_loop:
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lda scroll_row1,Y
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sm1:
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sta $400,X
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lda scroll_row2,Y
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sm2:
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sta $480,X
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lda scroll_row3,Y
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sm3:
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sta $500,X
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lda scroll_row4,Y
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sm4:
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sta $580,X
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iny
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inx
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cpx #40
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bne draw_loop
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;==================
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; flip pages
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;==================
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jsr page_flip ; 6
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;==================
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; delay
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;==================
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lda #125
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jsr WAIT
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;==================
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; loop forever
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;==================
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clc
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lda ANGLE
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adc #40
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cmp SCROLL_LENGTH
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bne blah
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lda #0
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sta ANGLE
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jmp scroll_loop
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blah:
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inc ANGLE
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jmp scroll_loop ; 3
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;=======================
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; decompress scroll
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;=======================
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decompress_scroll:
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ldy #0
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jsr scroll_load_and_increment
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sta SCROLL_LENGTH
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lda #<scroll_row1
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sta OUTL
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lda #>scroll_row1
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sta OUTH
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decompress_scroll_loop:
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jsr scroll_load_and_increment ; load compressed value
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cmp #$A1 ; EOF marker
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beq done_decompress_scroll ; if EOF, exit
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pha ; save
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and #$f0 ; mask
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cmp #$a0 ; see if special AX
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beq decompress_scroll_special
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pla ; note, PLA sets flags!
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ldx #$1 ; only want to print 1
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bne decompress_scroll_run
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decompress_scroll_special:
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pla
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and #$0f ; check if was A0
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bne decompress_scroll_color ; if A0 need to read run, color
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decompress_scroll_large:
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jsr scroll_load_and_increment ; get run length
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decompress_scroll_color:
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tax ; put runlen into X
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jsr scroll_load_and_increment ; get color
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decompress_scroll_run:
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sta (OUTL),Y
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pha
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clc ; increment 16-bit pointer
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lda OUTL
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adc #$1
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sta OUTL
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lda OUTH
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adc #$0
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sta OUTH
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pla
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dex ; repeat for X times
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bne decompress_scroll_run
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beq decompress_scroll_loop ; get next run
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done_decompress_scroll:
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rts
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scroll_load_and_increment:
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lda (INL),Y ; load and increment 16-bit pointer
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pha
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clc
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lda INL
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adc #$1
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sta INL
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lda INH
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adc #$0
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sta INH
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pla
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rts
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;===============================================
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; Variables
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;===============================================
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.include "deater_scroll.inc"
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