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dos33fsprogs/xmas_2019/xmas2019.s
Vince Weaver cbd11b0185 xmas2019: slow to 30Hz 
doesn't look as good, change the sine tables?
2019-12-19 11:56:06 -05:00

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8.6 KiB
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; XMAS2019 Demo
; + Display awesome tree
; + Starfield
; + Music
; + Snow
; by deater (Vince Weaver) <vince@deater.net>
; Zero Page
CH = $24
CV = $25
GBASL = $26
GBASH = $27
BASL = $28
BASH = $29
HGR_COLOR = $E4
DRAW_PAGE = $EE
SNOWX = $F0
COLOR = $F1
CMASK1 = $F2
CMASK2 = $F3
WHICH_Y = $F4
FRAME = $F5
TREESIZE = 12
.include "hardware.inc"
;==================================
;==================================
; Init
lda #0
sta FRAME
bit SET_GR
bit FULLGR
bit LORES
bit PAGE0
;==========================================================
;==========================================================
; 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 to vblank
; then we want another 4050 cycles to end, so 9120
;=================================
; do nothing
;=================================
; and take 9120 cycles to do it
do_nothing:
; Try X=139 Y=13 cycles=9114R6
nop
nop
nop
ldy #13 ; 2
loop1: ldx #139 ; 2
loop2: dex ; 2
bne loop2 ; 2nt/3
dey ; 2
bne loop1 ; 2nt/3
display_loop:
;==========================
; First 8*4 = 32 lines GR??
; 2080 cycles
bit SET_GR ; 4
bit LORES ; 4
; Try X=1 Y=188 cycles=2069 R3
lda COLOR ; 3
ldy #188 ; 2
bloop1: ldx #1 ; 2
bloop2: dex ; 2
bne bloop2 ; 2nt/3
dey ; 2
bne bloop1 ; 2nt/3
;=====================================
; Next 32*4 = 128 lines HGR1/GR1 for 20 cycles/HGR1
ldx #127 ; 2
middle_loop:
bit HIRES ; 4
; 27
lda COLOR ; 3
bit LORES ; 4
; 16
nop
nop
nop
nop
nop
nop
nop
nop
bit HIRES ; 4
; 5cycles
nop
lda COLOR
lda COLOR ; 3
lda COLOR ; 3
lda COLOR ; 3
lda COLOR ; 3
lda COLOR ; 3
lda COLOR ; 3
lda COLOR ; 3
lda COLOR ; 3
dex ; 2
bpl middle_loop ; 3
; -1
;==========================
; Next 8*4 = 32 lines GR ??
; 2080 cycles -8 -2 +1=2071
bit SET_GR ; 4
bit LORES ; 4
; Try X=1 Y=188 cycles=2069 R2
nop
ldy #188 ; 2
cloop1: ldx #1 ; 2
cloop2: dex ; 2
bne cloop2 ; 2nt/3
dey ; 2
bne cloop1 ; 2nt/3
vblank_start:
;===========================
; alternate between tree and snow/music
; every other frame
;===========================
lda #1 ; 2
eor FRAME ; 3
sta FRAME ; 3
beq tree_half ; 3
;====
; 11
; -1
jmp music_snow ; 3
;=====
; 2
tree_half:
;==========================================================
;==========================================================
; TREE at 30Hz
;==========================================================
;==========================================================
;==========================================================
; erase old lines
;==========================================================
; clear 10-30 on lines 8-38
; 4+(80+5)*20-1 = 1703 cycles
clear_lores:
lda #$0 ; 2
ldx #19 ; 2
;===========
; 4
clear_lores_loop:
sta $600+10,X ; 8 ; 5
sta $680+10,X ; 10 ; 5
sta $700+10,X ; 12 ; 5
sta $780+10,X ; 14 ; 5
sta $428+10,X ; 16 ; 5
sta $4A8+10,X ; 18 ; 5
sta $528+10,X ; 20 ; 5
sta $5A8+10,X ; 22 ; 5
sta $628+10,X ; 24 ; 5
sta $6A8+10,X ; 26 ; 5
sta $728+10,X ; 28 ; 5
sta $7A8+10,X ; 30 ; 5
sta $450+10,X ; 32 ; 5
sta $4D0+10,X ; 34 ; 5
sta $550+10,X ; 36 ; 5
sta $5D0+10,X ; 38 ; 5
;===========
; 80
dex ; 2
bpl clear_lores_loop ; 3
;===========
; 5
; -1
;============================================================
;============================================================
; move line
;============================================================
;============================================================
inc WHICH_Y ; 5
lda WHICH_Y ; 3
and #$7f ; 2
sta WHICH_Y ; 3
;=====
; 13
jmp draw_tree ; 3
.align $100
draw_tree:
;==========================================================
;==========================================================
; draw new line
;==========================================================
;==========================================================
;NEW: 2,4,6,8,10,12,14,16,18,2,2,2
;
; 2-1 + 7*TREESIZE + 85*TREESIZE +
; 18*(2+4+6+8+10+12+14+16+18+2+1+1)
;
; 1 + 84 + 1020 + 18*94 = 1105 + 1692 = 2797
ldx #0 ; 2
draw_line_loop:
;=================================
;=================================
; draw line
;=================================
;=================================
; X = which
; optimized: 34 + 18 + 34 + 18*len + -1 = 85+(18*len)
draw_line:
; set up proper sine table
ldy tree_line,X ; 4+
lda sine_table_l,Y ; 4+
sta sine_table_smc+1 ; 4
lda sine_table_h,Y ; 4+
sta sine_table_smc+2 ; 4
ldy WHICH_Y ; 3
sine_table_smc:
lda sine_table5,Y ; 4+
lsr ; 2
tay ; 2
bcs draw_line_odd ; 3
;======
; 34
draw_line_even:
; -1
lda tree_color,X ; 4+
and #$0f ; 2
sta ll_smc1+1 ; 4
lda #$f0 ; 2
sta ll_smc2+1 ; 4
jmp draw_line_actual ; 3
;====
; 18
draw_line_odd:
lda tree_color,X ; 4+
and #$f0 ; 2
sta ll_smc1+1 ; 4
lda #$0f ; 2
sta ll_smc2+1 ; 4
nop ; 2
;====
; 18
draw_line_actual:
lda gr_offsets_l,Y ; 4+
clc ; 2
adc tree_start,X ; 4+
sta ll_smc3+1 ; 4
sta ll_smc4+1 ; 4
lda gr_offsets_h,Y ; 4+
sta ll_smc3+2 ; 4
sta ll_smc4+2 ; 4
ldy tree_len,X ; 4+
;=====
; 34
line_loop:
ll_smc3:
lda $400,Y ; 4+
ll_smc2:
and #$f0 ; 2
ll_smc1:
ora #$0f ; 2
ll_smc4:
sta $400,Y ; 5
dey ; 2
bpl line_loop ; 3
;=====
; 18
; -1
inx ; 2
cpx #TREESIZE ; 2
bne draw_line_loop ; 3
; -1
;==============================================================
;==============================================================
; 4550 cycles
; -11 alternate frame
;-1703 erase lores
; -13 move tree
; -3 jmp (alignment)
;-2797 draw tree
; -3 jmp at end
;========
; 20
; Try X=2 Y=1 cycles=17R3
lda COLOR
ldy #1 ; 2
eloop1: ldx #2 ; 2
eloop2: dex ; 2
bne eloop2 ; 2nt/3
dey ; 2
bne eloop1 ; 2nt/3
jmp display_loop ; 3
;=======================================================
;=======================================================
; music/snow
;=======================================================
;=======================================================
music_snow:
; 4550 cycles
; -11 even/odd
; -2 even/odd jump
; -3 jump at end
;======
; 4534
; Try X=29 Y=30 cycles=4531R3
lda COLOR
ldy #30 ; 2
dloop1: ldx #29 ; 2
dloop2: dex ; 2
bne dloop2 ; 2nt/3
dey ; 2
bne dloop1 ; 2nt/3
jmp display_loop ; 3
tree:
; color start stop ; 01234567890123456789
; .byte $DD, 19, 20, $00 ; YY
; .byte $44, 17, 22, $00 ; DDDD
; .byte $CC, 16, 23, $00 ; LLLLLL
; .byte $44, 15, 24, $00 ; DDDDDDDD
; .byte $CC, 14, 25, $00 ; LLLLLRRLLL
; .byte $44, 13, 26, $00 ; DDDDDDDDDDDD
; .byte $CC, 12, 27, $00 ; LLLLLLLLLLLLLL
; .byte $44, 11, 28, $00 ; DDDDRRDDDDDDDDDD
; .byte $CC, 10, 29, $00 ; LLLLLLLLLLLLLLLLLL
; .byte $88, 19, 20, $00 ; BB
tree_color: .byte $DD,$44,$CC,$44, $CC,$11, $44, $CC, $44,$11, $CC, $88
tree_line: .byte 0, 1, 2, 3, 4, 4, 5, 6, 7, 7, 8, 9
tree_start: .byte 19, 18, 17, 16, 15, 20, 14, 13, 12, 16, 11, 19
tree_len: .byte 2-1,4-1,6-1,8-1,10-1,1-1,12-1,14-1,16-1,1-1,18-1, 2-1
gr_offsets_l:
.byte <$400,<$480,<$500,<$580,<$600,<$680,<$700,<$780
.byte <$428,<$4a8,<$528,<$5a8,<$628,<$6a8,<$728,<$7a8
.byte <$450,<$4d0,<$550,<$5d0,<$650,<$6d0,<$750,<$7d0
gr_offsets_h:
.byte >$400,>$480,>$500,>$580,>$600,>$680,>$700,>$780
.byte >$428,>$4a8,>$528,>$5a8,>$628,>$6a8,>$728,>$7a8
.byte >$450,>$4d0,>$550,>$5d0,>$650,>$6d0,>$750,>$7d0
sine_table_l:
.byte <sine_table5, <sine_table6, <sine_table7, <sine_table8
.byte <sine_table9, <sine_table10,<sine_table11,<sine_table12
.byte <sine_table13,<sine_table14,<sine_table15
sine_table_h:
.byte >sine_table5, >sine_table6, >sine_table7, >sine_table8
.byte >sine_table9, >sine_table10,>sine_table11,>sine_table12
.byte >sine_table13,>sine_table14,>sine_table15
.align $100
.include "sines.inc"
.include "vapor_lock.s"
.include "delay_a.s"
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