253 lines
3.6 KiB
ArmAsm
253 lines
3.6 KiB
ArmAsm
; HGR Demo2
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; Apple II graphics/music in 1k
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; 1k demo for Demosplash 2021
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; by deater (Vince Weaver) <vince@deater.net>
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; Zero Page
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.include "zp.inc"
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.include "hardware.inc"
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d2:
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;===================
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; music Player Setup
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lda #<peasant_song
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sta SONG_L
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lda #>peasant_song
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sta SONG_H
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; assume mockingboard in slot#4
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; TODO: inline?
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jsr mockingboard_init
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;================================
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; Clear screen and setup graphics
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;================================
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jsr HGR2 ; set hi-res 140x192, page2, fullscreen
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; A and Y both 0 at end
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sty FRAME ; start at 0
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;==================
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; create sinetable
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;ldy #0 ; Y is 0
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sinetable_loop:
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tya ; 2
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and #$3f ; wrap sine at 63 entries ; 2
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cmp #$20
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php ; save pos/negative for later
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and #$1f
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cmp #$10
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bcc sin_left ; blt
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sin_right:
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; sec carry should be set here
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eor #$FF
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adc #$20 ; 32-X
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sin_left:
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tax
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lda sinetable_base,X ; 4+
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plp
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bcc sin_done
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sin_negate:
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; carry set here
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eor #$ff
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adc #0
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sin_done:
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sta sinetable,Y
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iny
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bne sinetable_loop
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; NOTE: making gbash/gbasl table wasn't worth it
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;=====================
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; setup credits
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;===================
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; print message
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;===================
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print_message:
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.include "clear_bottom.s"
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ldx #12
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print_message_loop:
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lda message1,X
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sta $6d2,X
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sta $Ad2,X
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lda message2,X
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sta $6ea,X
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sta $Aea,X
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dex
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bpl print_message_loop
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;==========================
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; beginning of demo
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;==========================
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.include "dsr_shape.s"
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; start music, no music for spin
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start_interrupts:
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cli
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forever:
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;=====================
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; orange/green effect
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.include "moving.s"
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;=========================
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; clear screen first time
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skip_clear_smc:
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lda #0
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bne skip_clear
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jsr fast_hclr
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skip_clear:
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jsr flip_page
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;=====================
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; wires effect
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.include "wires.s"
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; jsr wires
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;=====================
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; oval effect
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; jsr oval
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.include "oval.s"
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;=====================
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; repeat
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; switch things up for the second round
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lda #$7f
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sta color_smc+1
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sta skip_clear_smc+1
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lda #159
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sta moving_size_smc+1
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sta oval_size_smc+1
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lda #<colorlookup2
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sta colorlookup_smc+1
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; make split screen so credits are visible
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bit TEXTGR
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jmp forever
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;===========================
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; common flip page routine
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flip_page:
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lda KEYPRESS
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bmi its_over
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ldy #$0
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lda HGR_PAGE ; will be $20/$40
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cmp #$20
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beq done_flip_page
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iny
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done_flip_page:
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ldx PAGE1,Y ; set display page to PAGE1 or PAGE2
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eor #$60 ; flip draw page between $2000/$4000
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sta HGR_PAGE
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rts
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;================
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; halt music
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; stop playing
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; turn off sound
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its_over:
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sei
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lda #$3f
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ldx #7
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jsr ay3_write_reg
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stuck_forever:
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bne stuck_forever
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; 01234567890123456789012345678901234567890"
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;message1:
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;.byte "THE APPLE II HAS NO PALETTE ROTATION"
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;message2:
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;.byte "WE ARE DOING THIS THE HARD WAY... "
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.macro hiasc str
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.repeat .strlen(str),I
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.byte .strat(str,I) | $80
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.endrep
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.endmacro
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message1:
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hiasc "CODE: DEATER"
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message2:
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hiasc "MUSIC: MA2E "
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shape_dsr:
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.byte $2d,$36,$ff,$3f
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.byte $24,$ad,$22,$24,$94,$21,$2c,$4d
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.byte $91,$3f,$36,$00
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even_lookup:
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.byte $D7,$DD,$F5, $D5,$D5,$D5,$D5
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odd_lookup:
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.byte $AA,$AA,$AA, $AB,$AE,$BA,$EA
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colorlookup2:
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.byte $11,$55,$5d,$7f,$5d,$55,$11,$00
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colorlookup:
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.byte $22,$aa,$ba,$ff,$ba,$aa,$22 ; use 00 from sinetable
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sinetable_base:
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; this is actually (32*sin(x))
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.byte $00,$03,$06,$09,$0C,$0F,$11,$14
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.byte $16,$18,$1A,$1C,$1D,$1E,$1F,$1F
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.byte $20
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sinetable=$8000
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.include "fast_hclr.s"
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; music
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.include "mA2E_2.s"
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.include "interrupt_handler.s"
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; must be last
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.include "mockingboard_setup.s"
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