dos33fsprogs/demos/lores_escape/missing.s
Vince Weaver e0febd1a90 demos: more work
keep making git mistakes urgh
2021-01-05 22:52:10 -05:00

302 lines
5.5 KiB
ArmAsm

; Missing scene
; Uses the 40x48d page1/page2 every-1-scanline pageflip mode
; by deater (Vince Weaver) <vince@deater.net>
missing_intro:
; we come into this at the very end of vblank
; we should be playing a frame of music every
; 17030 - 1243 = 15787 cycles or so
;===================
; init vars
; lda #0
; sta DRAW_PAGE
;=============================
; setup graphics code
jsr create_update_type1 ; now calls play_frame_compressed
; setup_rasterbars_page_smc=4
; lda #0
; sta setup_rasterbars_page_smc+1
; setup_rasterbars_offset_smc=2
lda #2
sta setup_rasterbars_offset_smc+1
; setup_rasterbars_bars_start_smc=16
lda #13
sta setup_rasterbars_bars_start_smc+1
; setup_rasterbars_bars_end_smc=48
lda #48
sta setup_rasterbars_bars_end_smc+1
; setup_rasterbars_start_addr1_smc:=#<(UPDATE_START+(13*49))
lda #<(UPDATE_START+(12*49))
sta setup_rasterbars_start_addr1_smc+1
; setup_rasterbars_start_addr2_smc:=#<(UPDATE_START+(13*49))
lda #>(UPDATE_START+(12*49))
sta setup_rasterbars_start_addr2_smc+1
jsr setup_rasterbars
; setup_rasterbars_page_smc=4
; lda #0
; sta setup_rasterbars_page_smc+1
; setup_rasterbars_offset_smc=2
lda #2
sta setup_rasterbars_offset_smc+1
; setup_rasterbars_bars_start_smc=16
lda #149
sta setup_rasterbars_bars_start_smc+1
; setup_rasterbars_bars_end_smc=48
lda #187
sta setup_rasterbars_bars_end_smc+1
; setup_rasterbars_start_addr1_smc:=#<(UPDATE_START+(149*49))
lda #<(UPDATE_START+(148*49))
sta setup_rasterbars_start_addr1_smc+1
; setup_rasterbars_start_addr2_smc:=#<(UPDATE_START+(149*49))
lda #>(UPDATE_START+(148*49))
sta setup_rasterbars_start_addr2_smc+1
jsr setup_rasterbars
jsr make_bars
;=============================
; Load graphic page0
lda #<k_low
sta GBASL
lda #>k_low
sta GBASH
lda #$c ; load to $c00
jsr load_rle_gr ; 2000
lda #4
sta DRAW_PAGE
jsr gr_copy_to_current ; copy to page1 ; 9292
; GR part
bit PAGE1
bit LORES ; 4
bit SET_GR ; 4
bit FULLGR ; 4
; jsr wait_until_keypressed
jsr play_frame_compressed
;=============================
; Load graphic page1
lda #<k_high
sta GBASL
lda #>k_high
sta GBASH
lda #$c
jsr load_rle_gr ; 2000
lda #0
sta DRAW_PAGE
jsr gr_copy_to_current ; 9292
; GR part
bit PAGE0
; jsr wait_until_keypressed
jsr play_frame_compressed
;==============================
; 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
; Try X=9 Y=6 cycles=307R3
lda TEMP
ldy #6 ; 2
mloopA: ldx #9 ; 2
mloopB: dex ; 2
bne mloopB ; 2nt/3
dey ; 2
bne mloopA ; 2nt/3
; jmp missing_display_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
; want colors 01234567
; line 0: $X0 to $800
; line 1: $X1 to $400
; line 2: $X2
; line 3: $X3
; line 4: $4X
; line 5: $5X
; line 6: $6X
; line 7: $7X
missing_display_loop:
jsr $9800 ; update_type1
;======================================================
; We have 4550 cycles in the vblank, use them wisely
;======================================================
; do_nothing should be
; 4550
; -12 jsr/ret to update_type1
; - 8 check keypress
; -1243
;=============
; 3287
; blah, current code the tight loops are right at a page boundary
jsr play_frame_compressed ; 6+1237
do_nothing_missing:
; want 3287
; Try X=163 Y=4 cycles=3285R2
nop
ldy #4 ; 2
gloop1: ldx #163 ; 2
gloop2: dex ; 2
bne gloop2 ; 2nt/3
dey ; 2
bne gloop1 ; 2nt/3
lda FRAME_PLAY_PAGE ; 3
cmp #4 ; 2
bne missing_display_loop ; 3
; lda KEYPRESS ; 4
; bpl missing_display_loop ; 3
; lda TEMP ; 3
; nop ; 2
; jmp missing_display_loop ; 3
rts
;BAR_START = 2*8
BAR_START = (2*8)-3 ; 13
BAR_START2 = 152-3
; $9800 + (49*18) + 4 = $9800+886 = $9800+$376=$9b76 (9b72)
; $9800 + (49*152) = $9800+7448 = $9800+$1d18=$b518
make_bars:
lda #<bar_colors_top
sta INL
lda #>bar_colors_top
sta INH
lda #<(UPDATE_START+49*(BAR_START+2)+4)
sta OUTL
lda #>(UPDATE_START+49*(BAR_START+2)+4)
sta OUTH
jsr make_bars_entry
lda #<bar_colors_bottom
sta INL
lda #>bar_colors_bottom
sta INH
lda #<(UPDATE_START+49*(BAR_START2+2)+4)
sta OUTL
lda #>(UPDATE_START+49*(BAR_START2+2)+4)
sta OUTH
jsr make_bars_entry
rts
make_bars_entry:
ldy #0
make_bars_loop:
lda (INL),Y
sta (OUTL),Y
iny
lda OUTL
clc
adc #48 ; because y++
sta OUTL
lda OUTH
adc #0
sta OUTH
; cpy #32
tya
and #$1f
bne make_bars_loop
rts
bar_colors_top:
.byte $03,$0b,$0f,$0b,$30,$00,$00
.byte $00,$02,$06,$0f,$06,$20,$00,$00
.byte $00,$04,$0c,$0f,$0c,$40,$00,$00
.byte $00,$05,$07,$0f,$07,$50,$00,$00,$00,$00,$00
bar_colors_bottom:
.byte $01,$03,$0f,$03,$10,$00,$00
.byte $00,$08,$0d,$0f,$0d,$80,$00,$00
.byte $00,$0c,$0e,$0f,$0e,$c0,$00,$00
.byte $00,$09,$0d,$0f,$0d,$90,$00,$00,$00,$00,$00