mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-07-07 13:29:07 +00:00
607 lines
9.3 KiB
ArmAsm
607 lines
9.3 KiB
ArmAsm
; VMW Chiptune Player
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.include "zp.inc"
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PT3_LOC = $4000
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NUM_FILES EQU 3
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;=============================
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; Setup
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;=============================
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pt3_setup:
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jsr HOME
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jsr TEXT
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bit HIRES
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bit SET_GR
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bit TEXTGR ; split text/graphics
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; lda #$20
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; sta HGR_PAGE
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; jsr HCLR
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; Init disk code
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jsr rts_init
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; init variables
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lda #0
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sta DRAW_PAGE
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sta DONE_PLAYING
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sta WHICH_FILE
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; lda #$ff
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; sta RASTERBARS_ON
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; print detection message
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; lda #<mocking_message ; load loading message
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; sta OUTL
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; lda #>mocking_message
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; sta OUTH
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; jsr move_and_print ; print it
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jsr mockingboard_detect_slot4 ; call detection routine
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cpx #$1
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beq mockingboard_found
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lda #<not_message ; if not found, print that
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sta OUTL
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lda #>not_message
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sta OUTH
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inc CV
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jsr move_and_print
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; jmp forever_loop ; and wait forever
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mockingboard_found:
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; lda #<found_message ; print found message
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; sta OUTL
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; lda #>found_message
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; sta OUTH
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; inc CV
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; jsr move_and_print
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;============================
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; Init the Mockingboard
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;============================
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jsr mockingboard_init
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jsr reset_ay_both
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jsr clear_ay_both
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;=========================
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; Setup Interrupt Handler
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;=========================
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; Vector address goes to 0x3fe/0x3ff
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; FIXME: should chain any existing handler
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lda #<interrupt_handler
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sta $03fe
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lda #>interrupt_handler
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sta $03ff
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;============================
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; Enable 50Hz clock on 6522
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;============================
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sei ; disable interrupts just in case
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lda #$40 ; Continuous interrupts, don't touch PB7
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sta $C40B ; ACR register
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lda #$7F ; clear all interrupt flags
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sta $C40E ; IER register (interrupt enable)
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lda #$C0
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sta $C40D ; IFR: 1100, enable interrupt on timer one oflow
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sta $C40E ; IER: 1100, enable timer one interrupt
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lda #$E7
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sta $C404 ; write into low-order latch
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lda #$4f
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sta $C405 ; write into high-order latch,
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; load both values into counter
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; clear interrupt and start counting
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; 4fe7 / 1e6 = .020s, 50Hz
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;============================
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; Draw title screen
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;============================
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;==================
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; load first song
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;==================
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jsr new_song
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;============================
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; Init Background
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;============================
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; jsr set_gr_page0
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; lda #0
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; sta DRAW_PAGE
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; sta SCREEN_Y
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;============================
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; Enable 6502 interrupts
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;============================
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cli ; clear interrupt mask
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;============================
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; Loop forever
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;============================
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main_loop:
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check_done:
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lda #$ff
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bit DONE_PLAYING
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beq main_loop ; if was all zeros, loop
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bmi main_loop ; if high bit set, paused
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bvs minus_song ; if bit 6 set, then left pressed
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; else, either song finished or
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; right pressed
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plus_song:
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sei ; disable interrupts
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jsr increment_file
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jmp done_play
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minus_song:
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sei ; disable interrupts
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jsr decrement_file
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done_play:
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lda #0
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sta DONE_PLAYING
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; lda #0
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; sta CH
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; jsr clear_bottoms
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jsr new_song
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cli ; re-enable interrupts
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jmp main_loop
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forever_loop:
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jmp forever_loop
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;=================
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; load a new song
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;=================
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new_song:
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;=========================
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; Init Variables
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;=========================
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lda #$0
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sta FRAME_COUNT
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; sta A_VOLUME
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; sta B_VOLUME
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; sta C_VOLUME
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; sta COPY_OFFSET
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; sta DECOMPRESS_TIME
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; sta COPY_TIME
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; sta MB_CHUNK_OFFSET
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; lda #$20
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; sta DECODER_STATE
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; lda #3
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; sta CHUNKSIZE
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;===========================
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; Print loading message
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;===========================
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jsr clear_bottoms ; clear bottom of page 0/1
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lda #0 ; print LOADING message
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sta CH
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lda #21
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sta CV
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lda #<loading_message
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sta OUTL
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lda #>loading_message
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sta OUTH
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jsr print_both_pages
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;===========================
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; Load in PT3 file
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;===========================
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jsr get_filename
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lda #8 ; print filename to screen
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sta CH
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lda #21
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sta CV
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lda INL
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sta OUTL
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lda INH
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sta OUTH
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jsr print_both_pages
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; needs to be space-padded $A0 30-byte filename
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lda #<readfile_filename
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sta namlo
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lda #>readfile_filename
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sta namhi
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ldy #0
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ldx #30 ; 30 chars
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name_loop:
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lda (INL),Y
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beq space_loop
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ora #$80
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sta (namlo),Y
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iny
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dex
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bne name_loop
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beq done_name_loop
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space_loop:
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lda #$a0 ; pad with ' '
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sta (namlo),Y
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iny
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dex
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bne space_loop
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done_name_loop:
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; open and read a file
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; loads to whatever it was BSAVED at (default is $2000)
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jsr read_file ; read PT3 file from disk
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;=========================
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; Print Info
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;=========================
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jsr clear_bottoms ; clear bottom of page 0/1
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; NUL terminate the strings we want to print
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lda #0
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sta PT3_LOC+$3E
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sta PT3_LOC+$62
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; print title
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lda #>(PT3_LOC+$1E) ; point to header title
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sta OUTH
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lda #<(PT3_LOC+$1E)
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sta OUTL
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lda #20 ; VTAB 20: HTAB from file
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jsr print_header_info
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; Print Author
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lda #>(PT3_LOC+$42) ; point to header title
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sta OUTH
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lda #<(PT3_LOC+$42)
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sta OUTL
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lda #21 ; VTAB 21: HTAB from file
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jsr print_header_info
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; Print clock
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lda #'0'+$80
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sta $7D0+13
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sta $7D0+13+2
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sta $7D0+13+3
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sta $BD0+13
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sta $BD0+13+2
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sta $BD0+13+3
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sta $7D0+13+7
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sta $7D0+13+9
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sta $7D0+13+10
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sta $BD0+13+7
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sta $BD0+13+9
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sta $BD0+13+10
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lda #':'+$80
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sta $7D0+13+1
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sta $BD0+13+1
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sta $7D0+13+8
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sta $BD0+13+8
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lda #'/'+$80
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sta $7D0+13+5
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sta $BD0+13+5
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; lda #23 ; VTAB 23: HTAB from file
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; jsr print_header_info
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; Print Left Arrow (INVERSE)
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lda #'<'
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sta $750
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sta $B50
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lda #'-'
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sta $751
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sta $B51
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; Print Rright Arrow (INVERSE)
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lda #'-'
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sta $776
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sta $B76
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lda #'>'
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sta $777
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sta $B77
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jsr pt3_init_song
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;=================================
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; BLARCH
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;=================================
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lda #$0
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sta current_line
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sta current_subframe
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sta current_pattern
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frame_count_loop:
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lda current_line
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bne fc_pattern_good
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lda current_subframe
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bne fc_pattern_good
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; load a new pattern in
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jsr pt3_set_pattern
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lda DONE_SONG
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beq fc_pattern_good
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jmp done_counting
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fc_pattern_good:
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lda current_subframe
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bne fc_line_good
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jsr pt3_decode_line
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lda pt3_pattern_done
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bne fc_line_good
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inc current_pattern ; increment pattern
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lda #0
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sta current_line
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sta current_subframe
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jmp frame_count_loop
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fc_line_good:
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inc current_subframe ; subframe++
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lda current_subframe
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cmp pt3_speed ; if we hit pt3_speed, move to next
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bne fc_do_frame
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fc_next_line:
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lda #0 ; reset subframe to 0
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sta current_subframe
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inc current_line ; and increment line
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lda current_line
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cmp #64 ; always end at 64.
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bne fc_do_frame ; is this always needed?
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fc_next_pattern:
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lda #0 ; reset line to 0
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sta current_line
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inc current_pattern ; increment pattern
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fc_do_frame:
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inc time_frame
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lda time_frame
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cmp #50
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bne fc_bayern
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lda #0
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sta time_frame
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; see if overflow low s
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lda $BD0+13+10
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cmp #'9'+$80
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bne inc_low_s
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; see if overflow high s
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lda $BD0+13+9
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cmp #'5'+$80
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bne inc_high_s
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inc $7D0+13+7
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inc $BD0+13+7
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lda #'0'+$80
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sta $7D0+13+9
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sta $BD0+13+9
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jmp clear_low_s
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inc_high_s:
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inc $7D0+13+9
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inc $BD0+13+9
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clear_low_s:
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lda #'0'+$80
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sta $7D0+13+10
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sta $BD0+13+10
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jmp inc_done
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inc_low_s:
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inc $7D0+13+10
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inc $BD0+13+10
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inc_done:
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fc_bayern:
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jmp frame_count_loop
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done_counting:
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; re-init, as we've run through it
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lda #0
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sta DONE_PLAYING
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sta current_pattern
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jsr pt3_init_song
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rts
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;===================
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; print header info
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;===================
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; shortcut to print header info
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; a = VTAB
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print_header_info:
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sta CV
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lda #4
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sta CH
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jmp print_both_pages ; print, tail call
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;==================
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; Get filename
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;==================
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; WHICH_FILE holds number
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; MAX_FILES has max
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; Scroll through until find
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; point INH:INL to it
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get_filename:
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ldy #0
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ldx WHICH_FILE
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lda #<song_list ; point to filename
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sta INL
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lda #>song_list
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sta INH
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get_filename_loop:
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cpx #0
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beq filename_found
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inner_loop:
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iny
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lda (INL),Y
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bne inner_loop
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iny
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dex
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jmp get_filename_loop
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filename_found:
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tya
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clc
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adc INL
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sta INL
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lda INH
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adc #0
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sta INH
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rts
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;===============================
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; Increment file we want to load
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;===============================
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increment_file:
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inc WHICH_FILE
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lda WHICH_FILE
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cmp #NUM_FILES
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bne done_increment
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lda #0
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sta WHICH_FILE
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done_increment:
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rts
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;===============================
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; Decrement file we want to load
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;===============================
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decrement_file:
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dec WHICH_FILE
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bpl done_decrement
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lda #(NUM_FILES-1)
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sta WHICH_FILE
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done_decrement:
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rts
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;=========
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; vars
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;=========
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time_frame: .byte $0
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;==========
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; filenames
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;==========
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song_list:
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.include "song_list.inc"
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;=========
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;routines
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;=========
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.include "../asm_routines/gr_offsets.s"
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.include "text_print.s"
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.include "mockingboard_a.s"
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.include "gr_fast_clear.s"
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.include "../asm_routines/pageflip.s"
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;.include "../asm_routines/gr_unrle.s"
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.include "../asm_routines/gr_setpage.s"
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.include "qkumba_rts.s"
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.include "../asm_routines/gr_hlin.s"
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.include "../asm_routines/keypress_minimal.s"
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;.include "rasterbars.s"
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;.include "volume_bars.s"
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.include "interrupt_handler.s"
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.include "pt3_lib.s"
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;=========
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; strings
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;=========
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;mocking_message: .asciiz "LOOKING FOR MOCKINGBOARD IN SLOT #4"
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not_message: .byte "NOT "
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found_message: .asciiz "FOUND"
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;done_message: .asciiz "DONE PLAYING"
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loading_message: .asciiz "LOADING"
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