mirror of
https://github.com/Pecusx/scorch_src.git
synced 2026-05-21 14:49:40 +02:00
499 lines
7.1 KiB
NASM
499 lines
7.1 KiB
NASM
; @com.wudsn.ide.asm.mainsourcefile=../scorch.asm
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/***************************************/
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/* Use MADS http://mads.atari8.info/ */
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/* Mode: DLI (char mode) */
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/***************************************/
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;icl "HIMARS14.h"
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;ICL '../lib/atari.hea'
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WIDTH = 40
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HEIGHT = 30
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; --- BASIC switch OFF
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org $2000\ mva #$ff portb\ rts\ ini $2000
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; --- dmsc LZSS player routine on zero page
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org $80
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chn_copy .ds 9
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chn_pos .ds 9
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bptr .ds 2
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cur_pos .ds 1
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chn_bits .ds 1
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bit_data .byte 1
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.proc get_byte
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lda song_data+1
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inc song_ptr
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bne skip
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inc song_ptr+1
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skip
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rts
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.endp
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song_ptr = get_byte + 1
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fcnt .ds 2
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fadr .ds 2
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fhlp .ds 2
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cloc .ds 1
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regA .ds 1
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regX .ds 1
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regY .ds 1
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; --- MAIN PROGRAM
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org $2000
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ant dta $80
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dta $42,a(scr),$02,$02,$02,$02,$02,$02,$02,$02,$02,$82,$02,$02,$02,$02,$82
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dta $02,$02,$02,$82,$82,$82,$02,$82,$02,$02,$02,$82
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dta $42,a(verline)
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dta $41,a(ant)
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verline
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:37 dta d" "
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build
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scr ins "HIMARS14.scr"
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.ds 2*40
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.ALIGN $0400
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fnt ins "HIMARS14.fnt"
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ift USESPRITES
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.ALIGN $0800
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pmg .ds $0300
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ift FADECHR = 0
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SPRITES
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els
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.ds $500
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eif
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eif
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song_data
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ins 'mmm_16.lzs'
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song_end
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POKEY = $D200
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buffers
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.ds 256 * 9
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; Song Initialization - this runs in the first tick:
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;
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.proc init_song
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; Example: here initializes song pointer:
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;mwa #song_data song_ptr
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; Init all channels:
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ldx #8
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ldy #0
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clear
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; Read just init value and store into buffer and POKEY
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jsr get_byte
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sta POKEY, x
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sty chn_copy, x
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cbuf
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sta buffers + 255
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inc cbuf + 2
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dex
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bpl clear
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; Initialize buffer pointer:
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sty bptr
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sty cur_pos
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rts
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.endp
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; Wait for next frame
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;
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.proc wait_frame
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lda 20
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delay
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cmp 20
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beq delay
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.endp
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; Play one frame of the song
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;
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.proc play_frame
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lda #>buffers
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sta bptr+1
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lda song_data
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sta chn_bits
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ldx #8
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; Loop through all "channels", one for each POKEY register
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chn_loop:
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lsr chn_bits
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bcs skip_chn ; C=1 : skip this channel
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lda chn_copy, x ; Get status of this stream
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bne do_copy_byte ; If > 0 we are copying bytes
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; We are decoding a new match/literal
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lsr bit_data ; Get next bit
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bne got_bit
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jsr get_byte ; Not enough bits, refill!
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ror ; Extract a new bit and add a 1 at the high bit (from C set above)
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sta bit_data ;
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got_bit:
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jsr get_byte ; Always read a byte, it could mean "match size/offset" or "literal byte"
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bcs store ; Bit = 1 is "literal", bit = 0 is "match"
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sta chn_pos, x ; Store in "copy pos"
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jsr get_byte
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sta chn_copy, x ; Store in "copy length"
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; And start copying first byte
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do_copy_byte:
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dec chn_copy, x ; Decrease match length, increase match position
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inc chn_pos, x
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ldy chn_pos, x
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; Now, read old data, jump to data store
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lda (bptr), y
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store:
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ldy cur_pos
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sta POKEY, x ; Store to output and buffer
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sta (bptr), y
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skip_chn:
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; Increment channel buffer pointer
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inc bptr+1
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dex
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bpl chn_loop ; Next channel
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inc cur_pos
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.endp
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; Check for ending of song and jump to the next frame
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;
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.proc check_end_song
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lda song_ptr + 1
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cmp #>song_end
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;bne wait_frame
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lda song_ptr
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cmp #<song_end
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;bne wait_frame
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.endp
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end_loop
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rts
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main
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jsr init_song
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; --- init PMG
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ift USESPRITES
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mva >pmg pmbase ;missiles and players data address
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mva #$03 pmcntl ;enable players and missiles
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eif
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lda:cmp:req $14 ;wait 1 frame
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; copy system font to $a000
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ldx #0
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@ lda $e000,x
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sta $a000,x
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;lda $e100,x ; i need digits only :]
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;sta $a100,x
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;lda $e200,x
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;sta $a200,x
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;lda $e300,x
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;sta $a300,x
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inx
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bne @-
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sei ;stop IRQ interrupts
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mva #$00 nmien ;stop NMI interrupts
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sta dmactl
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mva #$fe portb ;switch off ROM to get 16k more ram
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mwa #NMI $fffa ;new NMI handler
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mva #$c0 nmien ;switch on NMI+DLI again
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ift CHANGES ;if label CHANGES defined
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_lp lda trig0 ; FIRE #0
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beq stop
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lda trig1 ; FIRE #1
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beq stop
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lda consol ; START
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and #1
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beq stop
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lda skctl
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and #$04
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bne _lp ;wait to press any key; here you can put any own routine
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els
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null jmp DLI.dli1 ;CPU is busy here, so no more routines allowed
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eif
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stop
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mva #$00 pmcntl ;PMG disabled
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tax
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sta:rne hposp0,x+
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mva #$ff portb ;ROM switch on
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mva #$40 nmien ;only NMI interrupts, DLI disabled
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cli ;IRQ enabled
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lda #0
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ldx #8
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@ sta POKEY,x
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dex
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bpl @-
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;no glitching please (issue #67)
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lda #0
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sta $D400 ;dmactl
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sta $022F ;dmactls
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rts ;return to ... DOS
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; --- DLI PROGRAM
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.local DLI
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?old_dli = *
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ift !CHANGES
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dli1 lda trig0 ; FIRE #0
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beq stop
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lda trig1 ; FIRE #1
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beq stop
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lda consol ; START
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and #1
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beq stop
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lda skctl
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and #$04
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beq stop
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lda vcount
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cmp #$02
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bne dli1
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:3 sta wsync
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DLINEW dli10
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eif
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dli_start
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dli10
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sta regA
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c4 lda #$04
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sta wsync ;line=8
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sta color0
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sta gtictl
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DLINEW DLI.dli2 1 0 0
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dli2
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sta regA
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lda >fnt+$400*$01
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sta wsync ;line=96
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sta chbase
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DLINEW dli3 1 0 0
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dli3
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sta regA
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lda >fnt+$400*$02
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sta wsync ;line=136
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sta chbase
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DLINEW dli4 1 0 0
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dli4
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sta regA
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lda >fnt+$400*$01
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sta wsync ;line=168
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sta chbase
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DLINEW dli5 1 0 0
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dli5
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sta regA
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lda >fnt+$400*$02
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sta wsync ;line=176
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sta chbase
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DLINEW dli6 1 0 0
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dli6
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sta regA
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lda >fnt+$400*$03
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sta wsync ;line=184
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sta chbase
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DLINEW dli7 1 0 0
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dli7
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sta regA
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lda >fnt+$400*$00
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sta wsync ;line=200
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sta chbase
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DLINEW dli11 1 0 0
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dli11
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sta regA
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lda #>$a000 ; system font
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sta wsync ;line=232
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sta chbase
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lda #$01
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sta gtictl
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lda regA
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rti
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.endl
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; ---
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CHANGES = 1
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FADECHR = 0
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SCHR = 127
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; ---
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.proc NMI
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bit nmist
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bpl VBL
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jmp DLI.dli_start
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dliv equ *-2
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VBL
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sta regA
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stx regX
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sty regY
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sta nmist ;reset NMI flag
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mwa #ant dlptr ;ANTIC address program
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mva #@dmactl(standard|dma|lineX1) dmactl ;set new screen width
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inc cloc ;little timer
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; Initial values
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lda >fnt+$400*$00
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sta chbase
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c0 lda #$00
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sta colbak
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lda #$02
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sta chrctl
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lda #$01
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sta gtictl
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c1 lda #$0C
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sta color1
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c2 lda #$02
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sta color2
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c3 lda #$0E
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sta color3
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x0 lda #$00
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sta hposp0
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sta hposp1
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sta hposp2
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sta hposp3
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sta hposm0
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sta hposm1
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sta hposm2
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sta hposm3
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sta sizep0
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sta sizep1
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sta sizep2
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sta sizep3
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sta sizem
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sta colpm0
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sta colpm1
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sta colpm2
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sta colpm3
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sta color0
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mwa #DLI.dli_start dliv ;set the first address of DLI interrupt
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;this area is for yours routines
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jsr play_frame
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quit
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lda regA
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ldx regX
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ldy regY
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rti
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.endp
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; ---
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ini main
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; ---
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;opt l-
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.MACRO SPRITES
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missiles
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.ds $100
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player0
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.ds $100
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player1
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.ds $100
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player2
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.ds $100
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player3
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.ds $100
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.ENDM
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USESPRITES = 0
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.MACRO DLINEW
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mva <:1 NMI.dliv
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ift [>?old_dli]<>[>:1]
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mva >:1 NMI.dliv+1
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eif
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ift :2
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lda regA
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eif
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ift :3
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ldx regX
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eif
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ift :4
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ldy regY
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eif
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rti
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.def ?old_dli = *
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.ENDM
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