mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-08-19 14:29:25 +00:00
386 lines
6.9 KiB
ArmAsm
386 lines
6.9 KiB
ArmAsm
; Rocket Takeoff
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; Simple HGR/GR split
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; STATE0 = RIDE IN ON BIRD
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; STATE2 = BIRD RUNS / WALK INTO SHIP
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; STATE4 = PAUSE / SMOKE OUT BACK
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; STATE6 = ROTATING / FLAME SPRITES + TREES MOVING/SPEED UP
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; also horizon drop away?
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; 5 4 3 2 1 blastoff, another rocketship run
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; o/~ Take me to the moon o/~
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rocket_takeoff:
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;===================
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; init screen
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bit KEYRESET
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setup_rocket:
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;===================
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; init vars
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lda #0
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sta DRAW_PAGE
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sta FRAME
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sta FRAMEH
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sta XPOS
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sta STATE
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;=============================
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; Load graphic hgr
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lda #<takeoff_hgr
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sta LZ4_SRC
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lda #>takeoff_hgr
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sta LZ4_SRC+1
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lda #<(takeoff_hgr_end-8) ; skip checksum at end
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sta LZ4_END
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lda #>(takeoff_hgr_end-8) ; skip checksum at end
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sta LZ4_END+1
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lda #<$2000
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sta LZ4_DST
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lda #>$2000
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sta LZ4_DST+1
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sta HGR_PAGE
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jsr lz4_decode
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jsr draw_stars
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;=============================
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; Load graphic page0
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lda #$0c
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sta BASH
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lda #$00
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sta BASL ; load image to $c00
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lda #<takeoff
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sta GBASL
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lda #>takeoff
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sta GBASH
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jsr load_rle_gr
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lda #4
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sta DRAW_PAGE
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jsr gr_copy_to_current ; copy to page1
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; GR part
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bit PAGE1
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bit LORES ; 4
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bit SET_GR ; 4
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bit FULLGR ; 4
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bit PAGE0
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;==============================
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; setup graphics for vapor lock
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;==============================
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jsr vapor_lock ; 6
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; vapor lock returns with us at beginning of hsync in line
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; 114 (7410 cycles), so with 5070 lines to go
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jsr gr_copy_to_current ; 6+ 9292
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; now we have 322 left
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; GR part
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bit LORES ; 4
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bit SET_GR ; 4
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bit FULLGR ; 4
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; 322 - 12 = 310
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; - 3 for jmp
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; 307
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; Try X=9 Y=6 cycles=307
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ldy #6 ; 2
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toloopA:ldx #9 ; 2
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toloopB:dex ; 2
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bne toloopB ; 2nt/3
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dey ; 2
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bne toloopA ; 2nt/3
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jmp to_begin_loop
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.align $100
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;================================================
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; Takeoff Loop
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;================================================
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; each scan line 65 cycles
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; 1 cycle each byte (40cycles) + 25 for horizontal
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; Total of 12480 cycles to draw screen
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; Vertical blank = 4550 cycles (70 scan lines)
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; Total of 17030 cycles to get back to where was
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; want 12*4 = 48 lines of HIRES = 3120-4=3116
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; want 192-48=144 lines of LORES = 9360-4=9356
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to_begin_loop:
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bit HIRES ; 4
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; Try X=11 Y=51 cycles=3112 R4
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nop
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nop
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ldy #51 ; 2
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toloop8:ldx #11 ; 2
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toloop9:dex ; 2
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bne toloop9 ; 2nt/3
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dey ; 2
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bne toloop8 ; 2nt/3
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;===========================
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; Draw Lores bottom
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; 144 * 65 = 9360
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; -4 swith to LORES
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;====================
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; 9356
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bit LORES ; 4
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; Try X=10 Y=167 cycles=9353 R3
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lda $0
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ldy #167 ; 2
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toloop6:ldx #10 ; 2
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toloop7:dex ; 2
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bne toloop7 ; 2nt/3
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dey ; 2
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bne toloop6 ; 2nt/3
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;======================================================
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; We have 4550 cycles in the vblank, use them wisely
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;======================================================
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; do_nothing should be 4550
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; -23 state jump
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; -23 wrap counter
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; -7 timeout
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; -3589 state
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; -10 keypress
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; ===========
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; 898
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;================
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; wrap counter
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;================
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; nowrap = 13+10=23
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; wrap = 13+10=23
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inc FRAME ; 5
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lda FRAME ; 3
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cmp #4 ; 20Hz ; 2
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beq to_wrap ; 3
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to_nowrap:
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;-1
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lda $0 ; nop ; 3
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lda $0 ; nop ; 3
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nop ; 2
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jmp to_wrap_done ; 3
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to_wrap:
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lda #0 ; 2
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sta FRAME ; 3
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inc FRAMEH ; 5
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to_wrap_done:
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;==============
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; timeout after 5s or so?
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;==============
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; 7 cycles
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to_timeout:
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lda FRAMEH ; 3
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cmp #80 ; 2
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beq to_exit ; 3
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; -1
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; Try X=88 Y=2 cycles=893 R5
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lda $0
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nop
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ldy #2 ; 2
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toloop1:ldx #88 ; 2
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toloop2:dex ; 2
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bne toloop2 ; 2nt/3
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dey ; 2
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bne toloop1 ; 2nt/3
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; Set up jump table that runs same speed on 6502 and 65c02
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ldy STATE ; 3
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lda to_jump_table+1,y ; 4
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pha ; 3
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lda to_jump_table,y ; 4
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pha ; 3
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rts ; 6
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;=============
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; 23
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to_done_state:
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lda KEYPRESS ; 4
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bpl to_no_keypress ; 3
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jmp to_exit
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to_no_keypress:
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jmp to_begin_loop ; 3
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to_exit:
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bit KEYRESET ; clear keypress ; 4
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rts ; 6
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;.include "takeoff.inc"
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;takeoff_hgr:
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;.incbin "takeoff.img.lz4",11
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;takeoff_hgr_end:
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to_jump_table:
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.word (to_state0-1)
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.word (to_state2-1)
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.word (to_state0-1)
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.word (to_state0-1)
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;============================
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; state0: Draw+move Bird+Rider
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;============================
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; 13 + 2208 + 762 + 578 + 25 + 3 = 3589
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to_state0:
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jsr gr_copy_row22 ; 6+572
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lda #22 ; 2
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sta YPOS ; 3
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lda FRAMEH ; 3
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and #$1 ; 2
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beq to_bwalk ; 3
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;===========
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; 13
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to_bstand:
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; draw bird/rider standing ; -1
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lda #>bird_rider_stand_right ; 2
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sta INH ; 3
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lda #<bird_rider_stand_right ; 2
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sta INL ; 3
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jsr put_sprite ; 6
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jmp to_done_bwalk ; 3
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;=========
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; 18 + 2190 = 2208
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to_bwalk:
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; draw bird/rider walking
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lda #>bird_rider_walk_right ; 2
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sta INH ; 3
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lda #<bird_rider_walk_right ; 2
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sta INL ; 3
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jsr put_sprite ; 6
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nop ; 2
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lda $0
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lda $0
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lda $0
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nop
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nop
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nop
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;=========
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; 33 + 2175 = 2208
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to_done_bwalk:
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inc XPOS ; 5
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lda XPOS ; 3
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cmp #21 ; 2
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bne to_keep_state ; 3
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; -1
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inc STATE ; 5
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inc STATE ; 5
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jmp to_done_keep_state ; 3
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;========
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; 12
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to_keep_state:
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lda $0
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lda $0
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lda $0
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lda $0
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to_done_keep_state:
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; delay
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; Try X=151 Y=1 cycles=762
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ldy #1 ; 2
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toloopV:ldx #151 ; 2
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toloopW:dex ; 2
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bne toloopW ; 2nt/3
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dey ; 2
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bne toloopV ; 2nt/3
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jmp to_done_state ; 3
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;============================
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; state2: Do nothing
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;============================
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; 3586 + 3 = 3589
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to_state2:
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; delay
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; Try X=142 Y=5 cycles=3581 R5
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nop
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lda $0
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ldy #5 ; 2
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toloopZ:ldx #142 ; 2
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toloopY:dex ; 2
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bne toloopY ; 2nt/3
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dey ; 2
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bne toloopZ ; 2nt/3
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jmp to_done_state ; 3
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