mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-06-30 12:29:38 +00:00
166 lines
2.7 KiB
ArmAsm
166 lines
2.7 KiB
ArmAsm
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; Leaving house
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; Simple Text/GR split
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; STATE1 = Walk over to bird
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; STATE2 = get on bird
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; STATE3 = ride off on bird
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leaving_home:
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;===================
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; init screen
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bit KEYRESET
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setup_leaving:
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;===================
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; init vars
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lda #8
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sta DRAW_PAGE
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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 $c00
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lda #<leaving
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sta GBASL
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lda #>leaving
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sta GBASH
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jsr load_rle_gr
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lda #$a0
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ldy #10
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jsr clear_page_loop ; make top 6 lines spaces
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lda #0
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sta DRAW_PAGE
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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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jsr draw_moon_sky ; 6+54
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; 322 - 12 = 310
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; - 3 for jmp
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; 307 - 60 for sky = 247
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; Try X=9 Y=6 cycles=307
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; Try X=7 Y=6 cycles=247
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ldy #6 ; 2
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lvloopA:ldx #7 ; 2
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lvloopB:dex ; 2
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bne lvloopB ; 2nt/3
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dey ; 2
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bne lvloopA ; 2nt/3
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jmp lv_begin_loop
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.align $100
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;================================================
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; Leaving 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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lv_begin_loop:
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bit SET_TEXT ; 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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lvloop8:ldx #11 ; 2
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lvloop9:dex ; 2
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bne lvloop9 ; 2nt/3
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dey ; 2
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bne lvloop8 ; 2nt/3
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bit SET_GR ; 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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lvloop6:ldx #10 ; 2
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lvloop7:dex ; 2
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bne lvloop7 ; 2nt/3
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dey ; 2
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bne lvloop6 ; 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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lvloop1:ldx #9 ; 2
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lvloop2:dex ; 2
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bne lvloop2 ; 2nt/3
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dey ; 2
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bne lvloop1 ; 2nt/3
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lda KEYPRESS ; 4
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bpl lv_no_keypress ; 3
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jmp lv_start_over
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lv_no_keypress:
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jmp lv_begin_loop ; 3
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lv_start_over:
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bit KEYRESET ; clear keypress ; 4
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rts ; 6
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