dos33fsprogs/demosplash/credits.s

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2019-11-02 19:47:58 +00:00
; Uses the 40x48d page1/page2 every-1-scanline pageflip mode
; self modifying code to get some extra colors (pseudo 40x192 mode)
; by deater (Vince Weaver) <vince@deater.net>
credits:
;===================
; init screen
jsr TEXT
jsr HOME
bit KEYRESET
;===================
; init vars
lda #0
sta DRAW_PAGE
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sta FRAME
lda #<credits_text
sta CREDITS_POINTERL
lda #>credits_text
sta CREDITS_POINTERH
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;==================
; setup graphics
jsr create_update_type1
jsr setup_rasterbars
; change to page0/page0/page1/page1 for first 32 lines
; 0101010101010101010101010101010101010101
; 1100110011001100110011001100110011001100
; | *| *| *| *--------| *| *| *| *
; 0 34 78 12 5 4 78 12 56 9
; 11 1 2 22 33 33 3
lda #$54
sta $9001+(49*3)
sta $9001+(49*7)
sta $9001+(49*11)
sta $9001+(49*15)
sta $9001+(49*27)
sta $9001+(49*31)
sta $9001+(49*35)
sta $9001+(49*39)
lda #$55
sta $9001+(49*0)
sta $9001+(49*4)
sta $9001+(49*8)
sta $9001+(49*12)
sta $9001+(49*24)
sta $9001+(49*28)
sta $9001+(49*32)
sta $9001+(49*36)
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;=============================
; Load graphic page0
lda #<credits_low
sta GBASL
lda #>credits_low
sta GBASH
lda #$c ; load image to $c00
jsr load_rle_gr
lda #4
sta DRAW_PAGE
jsr gr_copy_to_current ; copy to page1
; GR part
bit PAGE1
bit LORES ; 4
bit SET_GR ; 4
bit FULLGR ; 4
; jsr wait_until_keypressed
;=============================
; Load graphic page1
lda #<credits_high
sta GBASL
lda #>credits_high
sta GBASH
lda #$c ; load to $c00
jsr load_rle_gr
lda #0
sta DRAW_PAGE
jsr gr_copy_to_current
; GR part
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bit PAGE0
; jsr wait_until_keypressed
;==============================
; setup graphics for vapor lock
;==============================
jsr vapor_lock
; vapor lock returns with us at beginning of hsync in line
; 114 (7410 cycles), so with 5070 lines to go
; GR part
bit LORES ; 4
bit SET_GR ; 4
bit FULLGR ; 4
jsr gr_copy_to_current ; 6+ 9292
; 5070 + 4550 = 9620
; 9292
; 12
; 6
; ====
; 310
; - 3 for jmp
; 307
; Try X=9 Y=6 cycles=307
ldy #6 ; 2
tloopA: ldx #9 ; 2
tloopB: dex ; 2
bne tloopB ; 2nt/3
dey ; 2
bne tloopA ; 2nt/3
jmp credits_loop ; 3
.align $100
;================================================
; Display Loop
;================================================
; each scan line 65 cycles
; 1 cycle each byte (40cycles) + 25 for horizontal
; Total of 12480 cycles to draw screen
; Vertical blank = 4550 cycles (70 scan lines)
; Total of 17030 cycles to get back to where was
; We want to alternate between page1 and page2 every 65 cycles
; vblank = 4550 cycles to do scrolling
credits_loop:
jsr $9000
;======================================================
; We have 4550 cycles in the vblank, use them wisely
;======================================================
; 4550 -- VBLANK
; -582 -- erase 22+4*(8+6+126) = 582
; -696 -- move+draw 4*(16+26+6+126) = 696
; -10 -- keypress
; -12 -- call/return of draw code
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; -446 -- do_words
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;=======
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; 2804
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pad_time:
; we erase, then draw
; doing a blanket erase of all 128 lines would cost 3459 cycles!
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;=========================
; do words
;=========================
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jsr draw_credits ; 6+440
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;=========================
; ERASE
;=========================
lda #$00 ; 2
sta smc_raster_color1_1+1 ; 4
sta smc_raster_color1_2+1 ; 4
sta smc_raster_color2_1+1 ; 4
sta smc_raster_color2_2+1 ; 4
sta smc_raster_color3_1+1 ; 4
;=============
; 22
; erase red
lda red_x ; 4
and #$7f ; 2
tax ; 2
jsr draw_rasterbar ; 6+126
; erase yellow
lda yellow_x ; 4
and #$7f ; 2
tax ; 2
jsr draw_rasterbar ; 6+126
; erase green
lda green_x ; 4
and #$7f ; 2
tax ; 2
jsr draw_rasterbar ; 6+126
; erase red
lda blue_x ; 4
and #$7f ; 2
tax ; 2
jsr draw_rasterbar ; 6+126
;=========================
; MOVE and DRAW
;=========================
;============
; move red
ldy red_x ; 4
lda movement_table,Y ; 4
sta red_x ; 4
and #$7f ; 2
tax ; 2
;==========
; 16
; draw red
lda #$33 ; 2
sta smc_raster_color1_1+1 ; 4
sta smc_raster_color1_2+1 ; 4
lda #$bb ; 2
sta smc_raster_color2_1+1 ; 4
sta smc_raster_color2_2+1 ; 4
lda #$ff ; 2
sta smc_raster_color3_1+1 ; 4
;=============
; 26
jsr draw_rasterbar ; 6+126
;============
; move yellow
ldy yellow_x ; 4
lda movement_table,Y ; 4
sta yellow_x ; 4
and #$7f ; 2
tax ; 2
;==========
; 16
; draw yellow
lda #$88 ; 2
sta smc_raster_color1_1+1 ; 4
sta smc_raster_color1_2+1 ; 4
lda #$dd ; 2
sta smc_raster_color2_1+1 ; 4
sta smc_raster_color2_2+1 ; 4
lda #$ff ; 2
sta smc_raster_color3_1+1 ; 4
;=============
; 26
jsr draw_rasterbar ; 6+126
;============
; move green
ldy green_x ; 4
lda movement_table,Y ; 4
sta green_x ; 4
and #$7f ; 2
tax ; 2
;==========
; 16
; draw green
lda #$44 ; 2
sta smc_raster_color1_1+1 ; 4
sta smc_raster_color1_2+1 ; 4
lda #$cc ; 2
sta smc_raster_color2_1+1 ; 4
sta smc_raster_color2_2+1 ; 4
lda #$ff ; 2
sta smc_raster_color3_1+1 ; 4
;=============
; 26
jsr draw_rasterbar ; 6+126
;============
; move blue
ldy blue_x ; 4
lda movement_table,Y ; 4
sta blue_x ; 4
and #$7f ; 2
tax ; 2
;==========
; 16
; draw blue
lda #$22 ; 2
sta smc_raster_color1_1+1 ; 4
sta smc_raster_color1_2+1 ; 4
lda #$66 ; 2
sta smc_raster_color2_1+1 ; 4
sta smc_raster_color2_2+1 ; 4
lda #$ff ; 2
sta smc_raster_color3_1+1 ; 4
;=============
; 26
jsr draw_rasterbar ; 6+126
;============================
; WAIT for VBLANK to finish
;============================
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; Try X=61 Y=9 cycles=2800 R4
nop
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nop
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ldy #9 ; 2
tloop1: ldx #61 ; 2
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tloop2: dex ; 2
bne tloop2 ; 2nt/3
dey ; 2
bne tloop1 ; 2nt/3
lda KEYPRESS ; 4
bpl cno_keypress ; 3
jmp credits_loop
cno_keypress:
jmp credits_loop ; 3
;========================
; Draw a rasterbar
; unroll as memory is free! haha
;========================
; X is location
; 2+22+24+24+24+24+6 = 126
draw_rasterbar:
ldy #0 ; 2
;====
lda y_lookup_l,X ; 4
sta OUTL ; 3
lda y_lookup_h,X ; 4
sta OUTH ; 3
smc_raster_color1_1:
lda #$33 ; 2
sta (OUTL),Y ; 6
;============
; 22
inx ; 2
lda y_lookup_l,X ; 4
sta OUTL ; 3
lda y_lookup_h,X ; 4
sta OUTH ; 3
smc_raster_color2_1:
lda #$bb ; 2
sta (OUTL),Y ; 6
inx ; 2
lda y_lookup_l,X ; 4
sta OUTL ; 3
lda y_lookup_h,X ; 4
sta OUTH ; 3
smc_raster_color3_1:
lda #$ff ; 2
sta (OUTL),Y ; 6
inx
lda y_lookup_l,X ; 4
sta OUTL ; 3
lda y_lookup_h,X ; 4
sta OUTH ; 3
smc_raster_color2_2:
lda #$bb ; 2
sta (OUTL),Y ; 6
inx
lda y_lookup_l,X ; 4
sta OUTL ; 3
lda y_lookup_h,X ; 4
sta OUTH ; 3
smc_raster_color1_2:
lda #$33 ; 2
sta (OUTL),Y ; 6
rts ; 6
red_x: .byte $10
yellow_x: .byte $20
green_x: .byte $30
blue_x: .byte $40
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;=================================
; draw credits
;=================================
; credits pointer
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;
; noframe: 13 = 13 (need 427) +12
; end: 13+12= 25 (need 415) +83
; newchar: 13+12+4+79 = 108 (need 333) +332
; putchar: 13+12+4+377+28+6 = 440
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draw_credits:
inc FRAME ; 5
lda FRAME ; 3
and #$f ; 2
beq credits_handle_next ; 3
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;====
; 13
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credits_long_delay:
; -1
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; 12+1 = 13 cycles
lda TEMP ; 3
lda TEMP ; 3
lda TEMP ; 3
nop ; 2
nop ; 2
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credits_skip:
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; 83 cycles
lda #56 ; 2
jsr delay_a ; delay 25+a (81)
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credits_short_delay:
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; 332 cycles-6 = 326
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; 83 cycles
lda #56 ; 2
jsr delay_a ; delay 25+a (81)
; 243 cycles
lda #216 ; 2
jsr delay_a ; delay 25+a (241)
rts ; 6
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credits_handle_next:
ldy #0 ; 2
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lda (CREDITS_POINTERL),Y ; 5
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cmp #$ff ; 2
beq credits_skip ; 3
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;===
; 12
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; -1
cmp #'@' ; 2
bcs credits_put_char ; bge ; 3
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;====
; 4
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credits_check_xy:
; -1
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sta CREDITS_Y ; 3
iny ; 2
lda (CREDITS_POINTERL),Y ; 5
sta CREDITS_X ; 3
iny ; 2
;====
; 14
lda (CREDITS_POINTERL),Y ; 5
sta colors_hi ; 4
iny ; 2
lda (CREDITS_POINTERL),Y ; 5
sta colors_hi+1 ; 4
iny ; 2
lda (CREDITS_POINTERL),Y ; 5
sta colors_lo ; 4
iny ; 2
lda (CREDITS_POINTERL),Y ; 5
sta colors_lo+1 ; 4
iny ; 2
;===
; 44
clc ; 2
tya ; 2
adc CREDITS_POINTERL ; 3
sta CREDITS_POINTERL ; 3
lda #0 ; 2
adc CREDITS_POINTERH ; 3
sta CREDITS_POINTERH ; 3
jmp credits_short_delay ; 3
;====
; 21
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credits_put_char:
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ldx CREDITS_X ; 3
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ldy CREDITS_Y ; 3
jsr put_char ; 6+365
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;======
; 377
clc ; 2
lda CREDITS_X ; 3
adc #4 ; 2
sta CREDITS_X ; 3
clc ; 2
lda #1 ; 2
adc CREDITS_POINTERL ; 3
sta CREDITS_POINTERL ; 3
lda #0 ; 2
adc CREDITS_POINTERH ; 3
sta CREDITS_POINTERH ; 3
;=====
; 28
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draw_credits_end:
rts ; 6
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.align $100
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credits_text:
.byte 0,10, $C4,$CF,$FC,$4C, 'C','O','D','E','[' ; "CODE:"
.byte 6,8, $C4,$CF,$FC,$4C, 'D','E','A','T','E','R' ; "DEATER"
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.byte '@','@' ; time pad
.byte 0,10, $00,$00,$00,$00, 'C','O','D','E','[' ; "CODE:"
.byte 6,8, $00,$00,$00,$00, 'D','E','A','T','E','R' ; "DEATER"
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.byte 0,8, $C4,$CF,$FC,$4C, 'M','U','S','I','C','[' ; "MUSIC:"
.byte 6,14, $C4,$CF,$FC,$4C, 'D','Y','A' ; "DYA"
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.byte '@','@' ; time pad
.byte 0,8, $00,$00,$00,$00, 'M','U','S','I','C','[' ; "MUSIC:"
.byte 6,14, $00,$00,$00,$00, 'D','Y','A' ; "DYA"
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.byte 0,8, $C4,$CF,$FC,$4C, 'M','A','G','I','C','[' ; "MAGIC:"
.byte 6,8, $C4,$CF,$FC,$4C, 'Q','K','U','M','B','A' ; "QKUMBA"
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.byte '@','@' ; time pad
.byte 0,8, $00,$00,$00,$00, 'M','A','G','I','C','[' ; "MAGIC:"
.byte 6,8, $00,$00,$00,$00, 'Q','K','U','M','B','A' ; "QKUMBA"
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.byte 0,8, $C4,$CF,$FC,$4C, 'T','H','A','N','K','S' ; "THANKS"
.byte 6,4, $C4,$CF,$FC,$4C, 'F','R','O','G','Y','S','U','E' ; "FROGYSUE"
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.byte '@' ; time pad
.byte 0,8, $00,$00,$00,$00, 'T','H','A','N','K','S' ; "THANKS"
.byte 6,4, $00,$00,$00,$00, 'F','R','O','G','Y','S','U','E' ; "FROGYSUE"
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.byte 0,10, $C4,$CF,$FC,$4C, 'A','@','V','M','W' ; "A VMW"
.byte 6,0, $C4,$CF,$FC,$4C, 'P','R','O','D','U','C','T','I','O','N'
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; "PRODUCTION"
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.byte 255 ; done
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credits_text_end:
.assert >credits_text = >(credits_text_end-1), error, "credits_text crosses page"