688 lines
12 KiB
ArmAsm
688 lines
12 KiB
ArmAsm
; Finally Arriving
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; Simple Text/GR split
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; Some zero-page action
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;TFV_X = 0
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;TFV_Y = 1
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TFG_X = 2
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;HEART_X = 3
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;HEART_Y = 4
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arriving_there:
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;===================
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; init screen
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setup_arrival:
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;===================
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; init vars
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lda #0
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sta FRAME
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sta FRAMEH
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lda #0
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sta TFV_X
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lda #8
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sta DRAW_PAGE
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; lda #14
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; sta HEART_X
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; lda #20
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; sta HEART_Y
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lda #22
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sta TFG_X
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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 $c00
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lda #<arrival
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sta GBASL
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lda #>arrival
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sta GBASH
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jsr load_rle_gr
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lda #$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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sei ; disable interrupt music
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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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arloopA:ldx #7 ; 2
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arloopB:dex ; 2
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bne arloopB ; 2nt/3
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dey ; 2
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bne arloopA ; 2nt/3
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jmp ar_begin_loop
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.align $100
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;================================================
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; Arrival 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 TEXT = 3120-4=3116
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; want 144-48 = 96 lines of undisturbed LORES = 6240 - 4 = 6236
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; lores lines 24-36 (80 - 143) are changing
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; so don't do much then
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; want 192-144=48 lines of LORES = 3120
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ar_begin_loop:
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; 3120
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; -4 set_text
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; -25 inc frame
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; -17 set state
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; -43 move
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; -8 check if done
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;=======
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; 3023
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bit SET_TEXT ; 4
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;====================
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; Update frame count
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;====================
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; no carry: 13+(12) = 25
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; carry: 13+12 = 25
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inc FRAME ; 5
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lda FRAME ; 3
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cmp #20 ; 2
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bne ar_waste_12 ; 3
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;============
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; 13
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; -1
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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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jmp ar_no_carry ; 3
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;============
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; 12
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ar_waste_12:
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lda $0 ; 3
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lda $0 ; 3
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lda $0 ; 3
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lda $0 ; 3
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ar_no_carry:
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;=================
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; check if done
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;=================
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lda FRAMEH ; 3
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cmp #32 ; 2
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bne ar_not_done ; 3
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jmp ar_all_done
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ar_not_done:
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;===========
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; 8
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; Set the state
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; STATE0 = 5+4+(5)+3 = 17
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; STATE2 = 5+5+4+3 = 17
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; STATE4 = 5+5+2+3+(2) =17
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; looking at FRAMEH (orig 5,16,30) -> 9, 20, 32
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; if 0 < 9 then STATE0 (waiting) $0 < $9
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; if 9 < 20 then STATE2 (walking) $9 < $14
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; if 20 < 32 then STATE4 (heart) $14 < $20
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cmp #9 ; 2
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bcs ar_state_notzero ; bge ; 3
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ar_state_zero:
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; -1
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lda $0 ; nop ; 3
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nop ; 2
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ldx #0 ; 2
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jmp ar_set_state ; 3
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ar_state_notzero:
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cmp #20 ; 2
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bcs ar_state_four ; bge ; 3
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ar_state_two:
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; -1
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ldx #2 ; 2
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jmp ar_set_state ; 3
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ar_state_four:
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nop ; 2
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ldx #4 ; 2
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ar_set_state:
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stx STATE ; 3
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;====================
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; Move TFV
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;====================
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; if move, 6+13=19
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; if not move, 6+13=19
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lda FRAME ; only move if FRAME==0 ; 3
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beq arv_move ; 3
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arv_nomove: ; -1
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lda $0 ;nop ; 3
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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 arv_done_move ; 3
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arv_move:
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lda STATE ; 3
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lsr ; 2
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clc ; 2
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adc TFV_X ; 3
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sta TFV_X ; 3
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arv_done_move:
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;====================
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; Move TFG
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; if move, 6+18=24
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; if not move, 6+18=24
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lda FRAME ; only move if FRAME===0 ; 3
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beq arg_move ; 3
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arg_nomove: ; -1
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lda $0 ;nop ; 3
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lda $0 ;nop ; 3
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lda $0 ;nop ; 3
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lda $0 ;nop ; 3
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nop ; 2
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nop ; 2
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jmp arg_done_move ; 3
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arg_move:
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lda STATE ; 3
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and FRAMEH ; 3
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lsr ; 2
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eor #$ff ; make negative ; 2
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sec ; 2
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adc TFG_X ; 3
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sta TFG_X ; 3
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arg_done_move:
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; Try X=29 Y=20 cycles=3021 R2
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nop
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ldy #20 ; 2
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arloop8:ldx #29 ; 2
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arloop9:dex ; 2
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bne arloop9 ; 2nt/3
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dey ; 2
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bne arloop8 ; 2nt/3
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;==========================
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; Set graphics mode, delay until done displaying the yard
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;==========================
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bit SET_GR ; 4
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; Try X=53 Y=23 cycles=6234 R2
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nop
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ldy #23 ; 2
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arloop6:ldx #53 ; 2
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arloop7:dex ; 2
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bne arloop7 ; 2nt/3
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dey ; 2
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bne arloop6 ; 2nt/3
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;===============================
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; Draw the Field
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;===============================
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draw_the_field:
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;===============================
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; Draw one of three states
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;===============================
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; STATE0 = draw nothing
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; STATE2 = draw open door + walking TFV+susie
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; STATE4 = draw heart
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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 ar_jump_table+1,y ; 4
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pha ; 3
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lda ar_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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ar_jump_table:
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.word (ar_state0-1)
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.word (ar_state2-1)
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.word (ar_state4-1)
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ar_back_from_jumptable:
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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 3120 (bottom of GR screen)
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; 4550 (vblank)
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; -23 (setup jump table)
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; -6237 (in state code)
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; -10 keypress
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; -1038 play_music
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; ===========
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; 362
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jsr play_music ; 6+1032
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; Try X=5 Y=45 cycles=1396 R4
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; Try X=3 Y=17 cycles=358 R4
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nop
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nop
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ldy #17 ; 2
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arloop1:ldx #3 ; 2
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arloop2:dex ; 2
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bne arloop2 ; 2nt/3
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dey ; 2
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bne arloop1 ; 2nt/3
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lda KEYPRESS ; 4
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bpl ar_no_keypress ; 3
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jmp ar_all_done
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ar_no_keypress:
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jmp ar_begin_loop ; 3
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ar_all_done:
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bit KEYRESET ; clear keypress ; 4
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cli ; re-enable interrupt music
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rts ; 6
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;=====================
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; State0 : do nothing
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;=====================
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; Delay 6237
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; -1524
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; -3
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;===========
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; 4710
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ar_state0:
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; draw fs standing
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lda #>tfg_stand_left ; 2
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sta INH ; 3
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lda #<tfg_stand_left ; 2
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sta INL ; 3
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lda #22 ; 2
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sta XPOS ; 3
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lda #24 ; 2
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sta YPOS ; 3
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jsr put_sprite ; 6
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;=========
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; 26 + 1498 = 1524
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; Try X=35 Y=26 cycles=4707 R3
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lda $0
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ldy #26 ; 2
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arloopT:ldx #35 ; 2
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arloopU:dex ; 2
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bne arloopU ; 2nt/3
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dey ; 2
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bne arloopT ; 2nt/3
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jmp ar_back_from_jumptable ; 3
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;======================================================
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; State2 : draw walking
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;======================================================
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; 785 = erase field
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; 3 (return)
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; 1490 = 1471+19 (draw tfv)
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; 33 (draw susie)
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; 1538 = 1519+19 (draw fs)
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; 1937 (draw falls)
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;==========
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; 5786
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; - 6237
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.align $100
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ar_state2:
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jsr erase_field ; 6+779
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; Try X=2 Y=28 cycles=449 R2
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nop
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ldy #28 ; 2
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arloopZ:ldx #2 ; 2
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arloopX:dex ; 2
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bne arloopX ; 2nt/3
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dey ; 2
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bne arloopZ ; 2nt/3
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;
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; jmp ar_back_from_jumptable ; 3
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lda TFV_X ; 3
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sta XPOS ; 3
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lda #24 ; 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 ar_walk ; 3
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;===========
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; 19
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ar_stand:
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; draw deater standing ; -1
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lda #>tfv_stand_right ; 2
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sta INH ; 3
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lda #<tfv_stand_right ; 2
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sta INL ; 3
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jsr put_sprite ; 6
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; need to waste 61 cycles
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lda #34 ; 2
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jsr delay_a ; 25+34 = 59
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jmp girl_walk ; 3
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;=========
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; 18 + 1392 = 1410
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ar_walk:
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; draw deater walking
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lda #>tfv_walk_right ; 2
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sta INH ; 3
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lda #<tfv_walk_right ; 2
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sta INL ; 3
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jsr put_sprite ; 6
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;=========
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; 16 + 1455 = 1471
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; girl walk
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girl_walk:
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lda TFG_X ; 3
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sta XPOS ; 3
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lda #24 ; 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 arg_walk ; 3
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;===========
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; 19
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arg_stand:
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; draw fs standing ; -1
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lda #>tfg_stand_left ; 2
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sta INH ; 3
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lda #<tfg_stand_left ; 2
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sta INL ; 3
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jsr put_sprite ; 6
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lda $0 ; nop ; 3
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jmp ar_susie ; 3
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;=========
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; 21 + 1498 = 1519
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arg_walk:
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; draw fs walking
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lda #>tfg_walk_left ; 2
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sta INH ; 3
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lda #<tfg_walk_left ; 2
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sta INL ; 3
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jsr put_sprite ; 6
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;=========
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; 16 + 1503 = 1519
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; draw susie
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; 33 cycles
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ar_susie:
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; draw susie at TFV_X-5, IFF TFV_X>10
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lda TFV_X ; 3
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sec ; 2
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sbc #4 ; 2
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tax ; 2
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cpx #1 ; 2
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bpl ar_yes_susie ; bge ; 3
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;============
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; 14
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ar_no_susie:
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; -1
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inc TFV_Y ; 5
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dec TFV_Y ; 5
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nop ; 2
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nop ; 2
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lda $0 ; 3
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jmp ar_done_susie ; 3
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;============
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; 19
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ar_yes_susie:
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lda #0 ; 2
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sta $4d0,X ; 5
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sta $4d1,X ; 5
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lda #$0f ; 2
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sta $4d2,X ; 5
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ar_done_susie:
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;===========
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; 19
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ar_draw_wfall:
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; draw minifalls
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lda #>wfall_sprite ; 2
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sta INH ; 3
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lda #<wfall_sprite ; 2
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sta INL ; 3
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lda #0 ; 2
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sta XPOS ; 3
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lda #24 ; 2
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sta YPOS ; 3
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jsr put_sprite ; 6
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;=========
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; 26 + 1911 = 1937
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jmp ar_back_from_jumptable ; 3
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.align $100
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;======================================================
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; State4 : heart
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;======================================================
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; 6237
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; -473 (draw heart)
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; -217 (erase heart)
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; -3 = return
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;==========
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; 5544
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ar_state4:
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jsr erase_heart ; 6+211
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lda FRAMEH ; 3
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and #$f ; 2
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tax ; 2
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lda ar_heart_lookup_x,x ; 4
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sta XPOS ; 3
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lda ar_heart_lookup_y,x ; 4
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sta YPOS ; 3
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; draw heart
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lda #>heart_sprite ; 2
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sta INH ; 3
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lda #<heart_sprite ; 2
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sta INL ; 3
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jsr put_sprite ; 6
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;=========
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; 37 + 436 = 473
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ar_done_heart:
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; delay
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; Try X=47 Y=23 cycles=5544
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ldy #23 ; 2
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arloopV:ldx #47 ; 2
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arloopW:dex ; 2
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bne arloopW ; 2nt/3
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dey ; 2
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bne arloopV ; 2nt/3
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jmp ar_back_from_jumptable
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;======================
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; erase field
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;======================
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; erase to green 4-25, 24-35
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; 4+ 22*[30 + 5 ] + 5 = 779
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erase_field:
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lda #$44 ; green ; 2
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ldx #21 ; 4 - 25 ; 2
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field_loop:
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sta $628+4,X ; 24 ; 5
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sta $6a8+4,X ; 26 ; 5
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sta $728+4,X ; 28 ; 5
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sta $7a8+4,X ; 30 ; 5
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sta $450+4,X ; 32 ; 5
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sta $4d0+4,X ; 34 ; 5
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dex ; 2
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bpl field_loop ; 3
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; -1
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rts ; 6
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;======================
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; erase heart
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;======================
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; erase to black, (13-18,14-20)
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; erase to green (13-18,20-24)
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; 2+ 6*[29 + 5 ] + 5 = 211
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erase_heart:
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ldx #5 ; 13 - 18 ; 2
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heart_loop:
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lda #$00 ; black ; 2
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sta $780+13,X ; 14 ; 5
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sta $428+13,X ; 16 ; 5
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sta $4a8+13,X ; 18 ; 5
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lda #$44 ; green ; 2
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sta $528+13,X ; 20 ; 5
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sta $5a8+13,X ; 22 ; 5
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dex ; 2
|
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bpl heart_loop ; 3
|
|
; -1
|
|
rts ; 6
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ar_heart_lookup_x:
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|
.byte 14,14,14,14,14,14,13,13,14,14,14,14
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; .byte 14,14,15,15,14,14,14,14
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|
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.byte 14,14,14,14
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|
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ar_heart_lookup_y: ; HEART_Y
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.byte 16,16,16,16,20,20,18,18,16,16,16,16
|
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.byte 16,16,16,16
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|
|
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heart_path:
|
|
; .byte $14,$20
|
|
; .byte $14,$20
|
|
; .byte $13,$18
|
|
; .byte $13,$18
|
|
; .byte $14,$16
|
|
; .byte $15,$16
|
|
; .byte $15,$14
|
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; .byte $14,$14
|
|
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