2018-10-04 04:33:04 +00:00
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; Rocket Takeoff
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; Simple HGR/GR split
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; STATE1 = RIDE IN ON BIRD
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; STATE2 = OFF BIRD
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; STATE3 = BIRD RUNS AWAY
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; STATE4 = WALK INTO SHIP
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; STATE5 = PAUSE
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; STATE6 = SMOKE OUT BACK
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; STATE7 = 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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;=============================
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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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; Starring People 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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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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; -10 keypress
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; ===========
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; 4540
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; Try X=9 Y=89 cycles=4540
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ldy #89 ; 2
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toloop1:ldx #9 ; 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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lda KEYPRESS ; 4
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bpl to_no_keypress ; 3
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jmp to_start_over
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to_no_keypress:
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jmp to_begin_loop ; 3
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to_start_over:
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bit KEYRESET ; clear keypress ; 4
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rts ; 6
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2018-10-19 02:27:08 +00:00
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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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