569 lines
11 KiB
ArmAsm
569 lines
11 KiB
ArmAsm
; Leaving house
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; Simple Text/GR split
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; STATE??? Wait 1 s
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; STATE??? Open door
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; STATE1 = Walk over to bird (3s? 20steps? so at ~5Hz? 12 ticks per step?)
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; 56789012345678901234
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; STATE2 = get on bird
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; STATE3 = ride off on bird
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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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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 #0
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sta FRAME
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sta FRAMEH
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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 #22
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; sta TFV_Y
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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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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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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 TEXT = 3120-4=3116
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; want 136-48 = 88 lines of undisturbed LORES = 5720 - 4 = 5716
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; lores lines 20-33 (80 - 135) are changing
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; so don't do much then
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; want 192-136=56 lines of LORES = 3640
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lv_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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; -11 move
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; -8 check if done
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;-1038 play music
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;=======
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; 2017
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bit SET_TEXT ; 4
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; Update frame count
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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 #12 ; 2
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bne lv_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 lv_no_carry ; 3
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;============
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; 12
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lv_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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lv_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 #35 ; 2
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bne lv_not_done ; 3
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jmp lv_all_done
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lv_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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cmp #5 ; 2
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bcs lv_state_notzero ; bge ; 3
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lv_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 lv_set_state ; 3
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lv_state_notzero:
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cmp #25 ; 2
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bcs lv_state_four ; bge ; 3
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lv_state_two:
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; -1
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ldx #2 ; 2
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jmp lv_set_state ; 3
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lv_state_four:
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nop ; 2
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ldx #4 ; 2
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lv_set_state:
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stx STATE ; 3
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;=====
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; Move
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; if move, 6+5=11
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; if not move, 6+5=11
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lda FRAME ; only ove if FRAME==0 ; 3
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beq lv_move ; 3
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lv_nomove: ; -1
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lda $0 ;nop ; 3
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jmp lv_done_move ; 3
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lv_move:
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inc TFV_X ; 5
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lv_done_move:
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jsr play_music
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; Try X=10 Y=36 cycles=2017
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; Try X=86 Y=7 cycles=3053 R2
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ldy #36 ; 2
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lvloop8:ldx #10 ; 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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;==========================
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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=75 Y=15 cycles=5716
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ldy #15 ; 2
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lvloop6:ldx #75 ; 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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; Draw the Yard
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;===============================
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draw_the_yard:
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jsr erase_yard ; 6+1249
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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 TFV on bird
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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 lv_jump_table+1,y ; 4
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pha ; 3
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lda lv_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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lv_jump_table:
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.word (lv_state0-1)
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.word (lv_state2-1)
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.word (lv_state4-1)
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lv_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 3640 (bottom of GR screen)
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; 4550 (vblank)
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; -1255 (clear yard)
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; -23 (setup jump table)
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; -5259 (in state code)
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; -10 keypress
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; ===========
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; 1643
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; Try X=163 Y=2 cycles=1643
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ldy #2 ; 2
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lvloop1:ldx #163 ; 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_all_done
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lv_no_keypress:
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jmp lv_begin_loop ; 3
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lv_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 5259
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; -2072
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; -3
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;===========
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; 3184
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lv_state0:
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; draw bird
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lda #>bird_stand_right_sprite ; 2
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sta INH ; 3
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lda #<bird_stand_right_sprite ; 2
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sta INL ; 3
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lda #24 ; 2
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sta XPOS ; 3
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lda #20 ; 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 + 2046 = 2072
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; Try X=211 Y=3 cycles=3184
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ldy #3 ; 2
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lvloopT:ldx #211 ; 2
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lvloopU:dex ; 2
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bne lvloopU ; 2nt/3
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dey ; 2
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bne lvloopT ; 2nt/3
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jmp lv_back_from_jumptable ; 3
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;======================================================
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; State2 : draw walking
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;======================================================
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; 1490 = 1471+19 (draw tfv)
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; 33 (draw susie)
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; 2072 (draw bird)
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; 1661 (draw door)
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; 3 (return)
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;==========
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; 5259
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lv_state2:
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lda TFV_X ; 3
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sta XPOS ; 3
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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 lv_walk ; 3
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;===========
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; 19
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lv_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 lv_susie ; 3
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;=========
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; 18 + 1392 = 1410
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lv_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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; draw susie
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; 33 cycles
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lv_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 #5 ; 2
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tax ; 2
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cpx #5 ; 2
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bcs lv_yes_susie ; bge ; 3
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;============
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; 14
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lv_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 lv_done_susie ; 3
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;============
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; 19
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lv_yes_susie:
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lda #0 ; 2
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sta $450,X ; 5
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sta $451,X ; 5
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lda #$0f ; 2
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sta $452,X ; 5
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lv_done_susie:
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;===========
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; 19
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; draw bird
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lda #>bird_stand_right_sprite ; 2
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sta INH ; 3
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lda #<bird_stand_right_sprite ; 2
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sta INL ; 3
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lda #24 ; 2
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sta XPOS ; 3
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lda #20 ; 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 + 2046 = 2072
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lv_draw_door:
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; draw door
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lda #>door_sprite ; 2
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sta INH ; 3
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lda #<door_sprite ; 2
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sta INL ; 3
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lda #5 ; 2
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sta XPOS ; 3
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lda #22 ; 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 + 1635 = 1661
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jmp lv_back_from_jumptable ; 3
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;======================================================
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; State4 : on bird
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;======================================================
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; 5259
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; -2227 = 2208+19 (draw bird)
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; -1661 (draw door)
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; -6 (return)
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;==========
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; 1365
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lv_state4:
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lda TFV_X ; 3
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sta XPOS ; 3
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lda #20 ; 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 lv_bwalk ; 3
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;===========
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; 19
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lv_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 lv_done_bwalk ; 3
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;=========
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; 18 + 2190 = 2208
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lv_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
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inc TFV_Y
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inc TFV_Y
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inc TFV_Y
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;=========
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; 16 + 2175
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lv_done_bwalk:
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; delay
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; Try X=67 Y=4 cycles=1365
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ldy #4 ; 2
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lvloopV:ldx #67 ; 2
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lvloopW:dex ; 2
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bne lvloopW ; 2nt/3
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dey ; 2
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bne lvloopV ; 2nt/3
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jmp lv_draw_door
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;======================
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; erase yard
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;======================
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; 1209 cycles
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; 4+ 31*[35 + 5 ] + 5 = 1249
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erase_yard:
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lda #$44 ; green ; 2
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ldx #30 ; 9 - 40 ; 2
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yard_loop:
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sta $528+9,X ; 20 ; 5
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sta $5a8+9,X ; 22 ; 5
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sta $628+9,X ; 24 ; 5
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sta $6a8+9,X ; 26 ; 5
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sta $728+9,X ; 28 ; 5
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sta $7a8+9,X ; 30 ; 5
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sta $450+9,X ; 32 ; 5
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dex ; 2
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bpl yard_loop ; 3
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; -1
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rts ; 6
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