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dos33fsprogs/chiptune_player/chiptune_player.s
Vince Weaver d5da6c1407 chiptune: add disable rasterbars support (R key)
2018-02-27 11:03:10 -05:00

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; VMW Chiptune Player
.include "zp.inc"
; program is ~4k, so from 0xc00 to 0x1C00
LZ4_BUFFER EQU $1C00 ; $1C00 - $5C00, 16k for now
UNPACK_BUFFER EQU $5E00 ; $5E00 - $9600, 14k, $3800
; trying not to hit DOS at $9600
; Reserve 3 chunks plus spare (14k)
NUM_FILES EQU 15
;=============================
; Setup
;=============================
jsr HOME
jsr TEXT
; init variables
lda #0
sta DRAW_PAGE
sta CH
sta CV
sta DONE_PLAYING
sta XPOS
sta MB_CHUNK_OFFSET
sta DECODE_ERROR
lda #$ff
sta RASTERBARS_ON
lda #14 ; start at WAVE
sta WHICH_FILE
; print detection message
lda #<mocking_message ; load loading message
sta OUTL
lda #>mocking_message
sta OUTH
jsr move_and_print ; print it
jsr mockingboard_detect_slot4 ; call detection routine
cpx #$1
beq mockingboard_found
lda #<not_message ; if not found, print that
sta OUTL
lda #>not_message
sta OUTH
inc CV
jsr move_and_print
jmp forever_loop ; and wait forever
mockingboard_found:
; lda #<found_message ; print found message
; sta OUTL
; lda #>found_message
; sta OUTH
; inc CV
; jsr move_and_print
;============================
; Init the Mockingboard
;============================
jsr mockingboard_init
jsr reset_ay_both
jsr clear_ay_both
;=========================
; Setup Interrupt Handler
;=========================
; Vector address goes to 0x3fe/0x3ff
; FIXME: should chain any existing handler
lda #<interrupt_handler
sta $03fe
lda #>interrupt_handler
sta $03ff
;============================
; Enable 50Hz clock on 6522
;============================
sei ; disable interrupts just in case
lda #$40 ; Continuous interrupts, don't touch PB7
sta $C40B ; ACR register
lda #$7F ; clear all interrupt flags
sta $C40E ; IER register (interrupt enable)
lda #$C0
sta $C40D ; IFR: 1100, enable interrupt on timer one oflow
sta $C40E ; IER: 1100, enable timer one interrupt
lda #$E7
sta $C404 ; write into low-order latch
lda #$4f
sta $C405 ; write into high-order latch,
; load both values into counter
; clear interrupt and start counting
; 4fe7 / 1e6 = .020s, 50Hz
;============================
; Draw title screen
;============================
jsr set_gr_page0 ; set page 0
lda #$4 ; draw page 1
sta DRAW_PAGE
jsr clear_screens ; clear both screens
lda #<chip_title ; point to title data
sta GBASL
lda #>chip_title
sta GBASH
; Load image ; load the image
lda #<$400
sta BASL
lda #>$400
sta BASH
jsr load_rle_gr
;==================
; load first song
;==================
jsr new_song
;============================
; Init Background
;============================
jsr set_gr_page0
lda #0
sta DRAW_PAGE
sta SCREEN_Y
;============================
; Enable 6502 interrupts
;============================
cli ; clear interrupt mask
;============================
; Loop forever
;============================
main_loop:
lda DECODE_ERROR
beq check_copy
sei
brk
check_copy:
lda COPY_TIME
beq check_decompress ; if zero, skip
lda #0
sta COPY_OFFSET
check_copy_loop:
jsr page_copy ;6+3621
inc COPY_OFFSET ; (opt: make subtract?) ; 5
lda #14 ; NOT HEX URGH!
cmp COPY_OFFSET
bne check_copy_loop
lda #0 ; we are done
sta COPY_TIME
check_decompress:
lda DECOMPRESS_TIME
beq check_done ; if zero, skip
jsr setup_next_subsong ; decompress
lda MB_CHUNK_OFFSET
sta TIME_TAKEN
lda #0
sta DECOMPRESS_TIME
;============================
; visualization
;============================
; jsr clear_top
; jsr draw_rasters
; jsr volume_bars
; jsr page_flip
check_done:
lda #$ff
bit DONE_PLAYING
beq main_loop ; if was all zeros, loop
bmi main_loop ; if high bit set, paused
bvs minus_song ; if bit 6 set, then left pressed
; else, either song finished or
; right pressed
plus_song:
sei ; disable interrupts
jsr increment_file
jmp done_play
minus_song:
sei ; disable interrupts
jsr decrement_file
done_play:
lda #0
sta DONE_PLAYING
lda #0
sta CH
jsr clear_bottoms
jsr new_song
cli ; re-enable interrupts
jmp main_loop
forever_loop:
jmp forever_loop
;=================
; load a new song
;=================
new_song:
;=========================
; Init Variables
;=========================
lda #$0
sta FRAME_COUNT
sta A_VOLUME
sta B_VOLUME
sta C_VOLUME
sta COPY_OFFSET
sta DECOMPRESS_TIME
sta COPY_TIME
sta MB_CHUNK_OFFSET
lda #$20
sta DECODER_STATE
lda #3
sta CHUNKSIZE
;===========================
; Print loading message
;===========================
jsr clear_bottoms ; clear bottom of page 0/1
lda #0 ; print LOADING message
sta CH
lda #21
sta CV
lda #<loading_message
sta OUTL
lda #>loading_message
sta OUTH
jsr print_both_pages
;===========================
; Load in KRW file
;===========================
jsr get_filename
lda #8
sta CH
lda #21
sta CV
lda INL
sta OUTL
lda INH
sta OUTH
jsr print_both_pages
disk_buff EQU LZ4_BUFFER
read_size EQU $4000
jsr read_file ; read KRW file from disk
;=========================
; Print Info
;=========================
jsr clear_bottoms ; clear bottom of page 0/1
lda #>LZ4_BUFFER ; point to LZ4 data
sta OUTH
lda #<LZ4_BUFFER
sta OUTL
ldy #3 ; skip KRW magic at front
; print title
lda #20 ; VTAB 20: HTAB from file
jsr print_header_info
; Print Author
lda #21 ; VTAB 21: HTAB from file
jsr print_header_info
; Print clock
lda #23 ; VTAB 23: HTAB from file
jsr print_header_info
; Print Left Arrow (INVERSE)
lda #'<'
sta $750
sta $B50
lda #'-'
sta $751
sta $B51
; Print Rright Arrow (INVERSE)
lda #'-'
sta $776
sta $B76
lda #'>'
sta $777
sta $B77
; Point LZ4 src at proper place
ldy #0
lda #>(LZ4_BUFFER+3)
sta LZ4_SRC+1
lda #<(LZ4_BUFFER+3)
sta LZ4_SRC
lda (LZ4_SRC),Y ; get header skip
clc
adc LZ4_SRC
sta LZ4_SRC
lda LZ4_SRC+1
adc #0
sta LZ4_SRC+1
lda #<UNPACK_BUFFER ; set input pointer
sta INL
lda #>UNPACK_BUFFER
sta INH
; Decompress first chunks
lda #$0
sta COPY_OFFSET
sta DECOMPRESS_TIME
lda #$3
sta CHUNKSIZE
lda #$20
sta DECODER_STATE
sta COPY_TIME
jsr setup_next_subsong
rts
;=================
; next sub-song
;=================
setup_next_subsong:
ldy #0
lda (LZ4_SRC),Y ; get next size value
sta LZ4_END
iny
lda (LZ4_SRC),Y
sta LZ4_END+1
lda #2 ; increment pointer
clc
adc LZ4_SRC
sta LZ4_SRC
lda LZ4_SRC+1
adc #0
sta LZ4_SRC+1
jsr lz4_decode ; decode
; tail-call?
rts
;===================
; print header info
;===================
; shortcut to print header info
; a = VTAB
print_header_info:
sta CV
iny ; adjust pointer
tya
ldy #0
clc
adc OUTL
sta OUTL
lda OUTH
adc #$0
sta OUTH
lda (OUTL),Y ; get HTAB value
sta CH
inc OUTL ; increment 16-bits
bne bloop22
inc OUTH
bloop22:
jmp print_both_pages ; print, tail call
;==============================================
; plan: takes 256 50Hz to play a chunk
; need to copy 14 256-byte blocks
; PLAY A (copying C)
; PLAY B (copying C)
; PLAY D (decompressing A/B/C)
;========================
; page copy
;========================
; want to copy:
; SRC: chunk_buffer+(2*256)+(COPY_OFFSET*3*256)
; DST: chunk_buffer+$2A00+(COPY_OFFSET*256)
page_copy:
clc ; 2
lda #>(UNPACK_BUFFER+512) ; 3
adc COPY_OFFSET ; 3
adc COPY_OFFSET ; 3
adc COPY_OFFSET ; 3
sta page_copy_loop+2 ; self modify ; 5
lda #>(UNPACK_BUFFER+$2A00) ; 2
adc COPY_OFFSET ; 3
sta page_copy_loop+5 ; self modify ; 5
ldx #$00 ; 2
page_copy_loop:
lda $1000,x ; 4
sta $1000,X ; 5
inx ; 2
bne page_copy_loop ; 2nt/3
rts ; 6
;======================
; 2+14*256+6+29= 3621
;==================
; Get filename
;==================
; WHICH_FILE holds number
; MAX_FILES has max
; Scroll through until find
; point INH:INL to it
get_filename:
ldy #0
ldx WHICH_FILE
lda #<krw_file ; point to filename
sta INL
lda #>krw_file
sta INH
get_filename_loop:
cpx #0
beq filename_found
inner_loop:
iny
lda (INL),Y
bne inner_loop
iny
dex
jmp get_filename_loop
filename_found:
tya
clc
adc INL
sta INL
lda INH
adc #0
sta INH
rts
;===============================
; Increment file we want to load
;===============================
increment_file:
inc WHICH_FILE
lda WHICH_FILE
cmp #NUM_FILES
bne done_increment
lda #0
sta WHICH_FILE
done_increment:
rts
;===============================
; Decrement file we want to load
;===============================
decrement_file:
dec WHICH_FILE
bpl done_decrement
lda #(NUM_FILES-1)
sta WHICH_FILE
done_decrement:
rts
;==========
; filenames
;==========
krw_file:
.asciiz "CAMOUFLAGE.KRW"
.asciiz "CHRISTMAS.KRW"
.asciiz "CRMOROS.KRW"
.asciiz "DEATH2.KRW"
.asciiz "DEMO4.KRW"
.asciiz "HARKONEN.KRW"
.asciiz "INTRO2.KRW"
.asciiz "LYRA2.KRW"
.asciiz "RANDOM.KRW"
.asciiz "ROBOT.KRW"
.asciiz "SDEMO.KRW"
.asciiz "SPUTNIK.KRW"
.asciiz "TECHNO.KRW"
.asciiz "UNIVERSE.KRW"
.asciiz "WAVE.KRW"
;=========
;routines
;=========
.include "../asm_routines/gr_offsets.s"
.include "../asm_routines/text_print.s"
.include "../asm_routines/mockingboard_a.s"
.include "../asm_routines/gr_fast_clear.s"
.include "../asm_routines/pageflip.s"
.include "../asm_routines/gr_unrle.s"
.include "../asm_routines/gr_setpage.s"
.include "../asm_routines/dos33_routines.s"
.include "../asm_routines/gr_hlin.s"
.include "../asm_routines/lz4_decode.s"
.include "../asm_routines/keypress_minimal.s"
.include "rasterbars.s"
.include "volume_bars.s"
.include "interrupt_handler.s"
;=========
; strings
;=========
mocking_message: .asciiz "LOOKING FOR MOCKINGBOARD IN SLOT #4"
not_message: .byte "NOT "
found_message: .asciiz "FOUND"
;done_message: .asciiz "DONE PLAYING"
loading_message: .asciiz "LOADING"
;============
; graphics
;============
.include "chip_title.inc"
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