dos33fsprogs/pt3_player/pt3_lib.s
2019-05-10 12:20:44 -04:00

1215 lines
27 KiB
ArmAsm

; TODO
; move some of these flags to be bits rather than bytes?
; enabled could be bit 6 or 7 for fast checking
;
; Use memset to set things to 0?
NOTE_WHICH=0
NOTE_VOLUME=1
NOTE_TONE_SLIDING_L=2
NOTE_TONE_SLIDING_H=3
NOTE_ENABLED=4
NOTE_ENVELOPE_ENABLED=5
NOTE_SAMPLE_POINTER_L=6
NOTE_SAMPLE_POINTER_H=7
NOTE_SAMPLE_LOOP=8
NOTE_SAMPLE_LENGTH=9
NOTE_TONE_L=10
NOTE_TONE_H=11
NOTE_AMPLITUDE=12
NOTE_NOTE=13
NOTE_LEN=14
NOTE_LEN_COUNT=15
NOTE_SPEC_COMMAND=16 ; is this one needed?
NOTE_NEW_NOTE=17
NOTE_ALL_DONE=18
NOTE_ADDR_L=19
NOTE_ADDR_H=20
NOTE_ORNAMENT_POINTER_L=21
NOTE_ORNAMENT_POINTER_H=22
NOTE_ORNAMENT_LOOP=23
NOTE_ORNAMENT_LENGTH=24
NOTE_ONOFF=25
NOTE_TONE_ACCUMULATOR_L=26
NOTE_TONE_ACCUMULATOR_H=27
NOTE_TONE_SLIDE_COUNT=28
NOTE_ORNAMENT_POSITION=29
NOTE_SAMPLE_POSITION=30
NOTE_ENVELOPE_SLIDING=31
NOTE_NOISE_SLIDING=32
NOTE_AMPLITUDE_SLIDING=33
note_a:
.byte 'A' ; NOTE_WHICH
.byte $0 ; NOTE_VOLUME
.byte $0 ; NOTE_TONE_SLIDING_L
.byte $0 ; NOTE_TONE_SLIDING_H
.byte $0 ; NOTE_ENABLED
.byte $0 ; NOTE_ENVELOPE_ENABLED
.byte $0 ; NOTE_SAMPLE_POINTER_L
.byte $0 ; NOTE_SAMPLE_POINTER_H
.byte $0 ; NOTE_SAMPLE_LOOP
.byte $0 ; NOTE_SAMPLE_LENGTH
.byte $0 ; NOTE_TONE_L
.byte $0 ; NOTE_TONE_H
.byte $0 ; NOTE_AMPLITUDE
.byte $0 ; NOTE_NOTE
.byte $0 ; NOTE_LEN
.byte $0 ; NOTE_LEN_COUNT
.byte $0 ; NOTE_SPEC_COMMAND
.byte $0 ; NOTE_NEW_NOTE
.byte $0 ; NOTE_ALL_DONE
.byte $0 ; NOTE_ADDR_L
.byte $0 ; NOTE_ADDR_H
.byte $0 ; NOTE_ORNAMENT_POINTER_L
.byte $0 ; NOTE_ORNAMENT_POINTER_H
.byte $0 ; NOTE_ORNAMENT_LOOP
.byte $0 ; NOTE_ORNAMENT_LENGTH
.byte $0 ; NOTE_ONOFF
.byte $0 ; NOTE_TONE_ACCUMULATOR_L
.byte $0 ; NOTE_TONE_ACCUMULATOR_H
.byte $0 ; NOTE_TONE_SLIDE_COUNT
.byte $0 ; NOTE_ORNAMENT_POSITION
.byte $0 ; NOTE_SAMPLE_POSITION
.byte $0 ; NOTE_ENVELOPE_SLIDING
.byte $0 ; NOTE_NOISE_SLIDING
.byte $0 ; NOTE_AMPLITUDE_SLIDING
note_b:
.byte 'B' ; NOTE_WHICH
.byte $0 ; NOTE_VOLUME
.byte $0 ; NOTE_TONE_SLIDING_L
.byte $0 ; NOTE_TONE_SLIDING_H
.byte $0 ; NOTE_ENABLED
.byte $0 ; NOTE_ENVELOPE_ENABLED
.byte $0 ; NOTE_SAMPLE_POINTER_L
.byte $0 ; NOTE_SAMPLE_POINTER_H
.byte $0 ; NOTE_SAMPLE_LOOP
.byte $0 ; NOTE_SAMPLE_LENGTH
.byte $0 ; NOTE_TONE_L
.byte $0 ; NOTE_TONE_H
.byte $0 ; NOTE_AMPLITUDE
.byte $0 ; NOTE_NOTE
.byte $0 ; NOTE_LEN
.byte $0 ; NOTE_LEN_COUNT
.byte $0 ; NOTE_SPEC_COMMAND
.byte $0 ; NOTE_NEW_NOTE
.byte $0 ; NOTE_ALL_DONE
.byte $0 ; NOTE_ADDR_L
.byte $0 ; NOTE_ADDR_H
.byte $0 ; NOTE_ORNAMENT_POINTER_L
.byte $0 ; NOTE_ORNAMENT_POINTER_H
.byte $0 ; NOTE_ORNAMENT_LOOP
.byte $0 ; NOTE_ORNAMENT_LENGTH
.byte $0 ; NOTE_ONOFF
.byte $0 ; NOTE_TONE_ACCUMULATOR_L
.byte $0 ; NOTE_TONE_ACCUMULATOR_H
.byte $0 ; NOTE_TONE_SLIDE_COUNT
.byte $0 ; NOTE_ORNAMENT_POSITION
.byte $0 ; NOTE_SAMPLE_POSITION
.byte $0 ; NOTE_ENVELOPE_SLIDING
.byte $0 ; NOTE_NOISE_SLIDING
.byte $0 ; NOTE_AMPLITUDE_SLIDING
note_c:
.byte 'C' ; NOTE_WHICH
.byte $0 ; NOTE_VOLUME
.byte $0 ; NOTE_TONE_SLIDING_L
.byte $0 ; NOTE_TONE_SLIDING_H
.byte $0 ; NOTE_ENABLED
.byte $0 ; NOTE_ENVELOPE_ENABLED
.byte $0 ; NOTE_SAMPLE_POINTER_L
.byte $0 ; NOTE_SAMPLE_POINTER_H
.byte $0 ; NOTE_SAMPLE_LOOP
.byte $0 ; NOTE_SAMPLE_LENGTH
.byte $0 ; NOTE_TONE_L
.byte $0 ; NOTE_TONE_H
.byte $0 ; NOTE_AMPLITUDE
.byte $0 ; NOTE_NOTE
.byte $0 ; NOTE_LEN
.byte $0 ; NOTE_LEN_COUNT
.byte $0 ; NOTE_SPEC_COMMAND
.byte $0 ; NOTE_NEW_NOTE
.byte $0 ; NOTE_ALL_DONE
.byte $0 ; NOTE_ADDR_L
.byte $0 ; NOTE_ADDR_H
.byte $0 ; NOTE_ORNAMENT_POINTER_L
.byte $0 ; NOTE_ORNAMENT_POINTER_H
.byte $0 ; NOTE_ORNAMENT_LOOP
.byte $0 ; NOTE_ORNAMENT_LENGTH
.byte $0 ; NOTE_ONOFF
.byte $0 ; NOTE_TONE_ACCUMULATOR_L
.byte $0 ; NOTE_TONE_ACCUMULATOR_H
.byte $0 ; NOTE_TONE_SLIDE_COUNT
.byte $0 ; NOTE_ORNAMENT_POSITION
.byte $0 ; NOTE_SAMPLE_POSITION
.byte $0 ; NOTE_ENVELOPE_SLIDING
.byte $0 ; NOTE_NOISE_SLIDING
.byte $0 ; NOTE_AMPLITUDE_SLIDING
pt3_version: .byte $0
pt3_frequency_table: .byte $0
pt3_speed: .byte $0
pt3_num_patterns: .byte $0
pt3_loop: .byte $0
pt3_noise_period: .byte $0
pt3_noise_add: .byte $0
pt3_envelope_period_l: .byte $0
pt3_envelope_period_h: .byte $0
pt3_envelope_slide_l: .byte $0
pt3_envelope_slide_h: .byte $0
pt3_envelope_slide_add_l:.byte $0
pt3_envelope_slide_add_h:.byte $0
pt3_envelope_add: .byte $0
pt3_envelope_type: .byte $0
pt3_envelope_type_old: .byte $0
pt3_envelope_delay: .byte $0
pt3_envelope_delay_orig:.byte $0
;pt3_current_pattern: .byte $0
pt3_music_len: .byte $0
pt3_mixer_value: .byte $0
temp_word_l: .byte $0
temp_word_h: .byte $0
; Header offsets
PT3_HEADER_FREQUENCY = $63
PT3_PATTERN_LOC_L = $67
PT3_PATTERN_LOC_H = $68
PT3_SAMPLE_LOC_L = $69
PT3_SAMPLE_LOC_H = $6A
PT3_ORNAMENT_LOC_L = $A9
PT3_OTNAMENT_LOC_H = $AA
PT3_PATTERN_TABLE = $C9
;===========================
; Load Ornament
;===========================
load_ornament:
ldy #0
; a->ornament_pointer=pt3->ornament_patterns[a->ornament];
; a->ornament_loop=pt3->data[a->ornament_pointer];
; a->ornament_pointer++;
; a->ornament_length=pt3->data[a->ornament_pointer];
; a->ornament_pointer++;
clc
lda note_a+NOTE_ORNAMENT_POINTER_L
adc #2
sta note_a+NOTE_ORNAMENT_POINTER_L
lda note_a+NOTE_ORNAMENT_POINTER_H
adc #0
sta note_a+NOTE_ORNAMENT_POINTER_H
rts
;===========================
; Load Sample
;===========================
;
load_sample:
; a->sample_pointer=pt3->sample_patterns[a->sample];
; a->sample_loop=pt3->data[a->sample_pointer];
; a->sample_pointer++;
; a->sample_length=pt3->data[a->sample_pointer];
; a->sample_pointer++;
rts
pt3_init_song:
lda #$f
sta note_a+NOTE_VOLUME
sta note_b+NOTE_VOLUME
sta note_c+NOTE_VOLUME
lda #$0
sta note_a+NOTE_TONE_SLIDING_L
sta note_b+NOTE_TONE_SLIDING_L
sta note_c+NOTE_TONE_SLIDING_L
sta note_a+NOTE_TONE_SLIDING_H
sta note_b+NOTE_TONE_SLIDING_H
sta note_c+NOTE_TONE_SLIDING_H
sta note_a+NOTE_ENABLED
sta note_b+NOTE_ENABLED
sta note_c+NOTE_ENABLED
sta note_a+NOTE_ENVELOPE_ENABLED
sta note_b+NOTE_ENVELOPE_ENABLED
sta note_c+NOTE_ENVELOPE_ENABLED
lda #'A'
jsr load_ornament
lda #'A'
jsr load_sample
lda #'B'
jsr load_ornament
lda #'B'
jsr load_sample
lda #'C'
jsr load_ornament
lda #'C'
jsr load_sample
lda #$0
sta pt3_noise_period
sta pt3_noise_add
sta pt3_envelope_period_l
sta pt3_envelope_period_h
sta pt3_envelope_type
; sta pt3_current_pattern
rts
;=====================================
; Calculate Note
;=====================================
calculate_note:
ldy #0
lda note_a+NOTE_ENABLED,Y
bne note_enabled
lda #0
sta note_a+NOTE_AMPLITUDE,Y
jmp done_note
note_enabled:
; b0 = pt3->data[a->sample_pointer + a->sample_position * 4];
; b1 = pt3->data[a->sample_pointer + a->sample_position * 4 + 1];
; a->tone = pt3->data[a->sample_pointer + a->sample_position * 4 + 2];
; a->tone += (pt3->data[a->sample_pointer + a->sample_position * 4 + 3])<<8;
; a->tone += a->tone_accumulator;
; if ((b1 & 0x40) != 0) {
; a->tone_accumulator=a->tone;
; }
; j = a->note + ((pt3->data[a->ornament_pointer + a->ornament_position]<<24)>>24);
; if (j < 0) j = 0;
; else if (j > 95) j = 95;
; w = GetNoteFreq(j,pt3->frequency_table);
; a->tone = (a->tone + a->tone_sliding + w) & 0xfff;
; if (a->tone_slide_count > 0) {
; a->tone_slide_count--;
; if (a->tone_slide_count==0) {
; a->tone_sliding+=a->tone_slide_step;
; a->tone_slide_count = a->tone_slide_delay;
; if (!a->simplegliss) {
; if ( ((a->tone_slide_step < 0) &&
; (a->tone_sliding <= a->tone_delta)) ||
; ((a->tone_slide_step >= 0) &&
; (a->tone_sliding >= a->tone_delta)) ) {
; a->note = a->slide_to_note;
; a->tone_slide_count = 0;
; a->tone_sliding = 0;
; }
; }
; }
; }
; a->amplitude= (b1 & 0xf);
; if ((b0 & 0x80)!=0) {
; if ((b0&0x40)!=0) {
; if (a->amplitude_sliding < 15) {
; a->amplitude_sliding++;
; }
; }
; else {
; if (a->amplitude_sliding > -15) {
; a->amplitude_sliding--;
; }
; }
; }
; a->amplitude+=a->amplitude_sliding;
; clamp amplitude to 0 - 15
lda note_a+NOTE_AMPLITUDE,Y
check_amp_lo:
bpl check_amp_hi
lda #0
jmp write_clamp_amplitude
check_amp_hi:
cmp #16
bcc done_clamp_amplitude ; blt
lda #15
write_clamp_amplitude:
sta note_a+NOTE_AMPLITUDE,Y
done_clamp_amplitude:
; //if (PlParams.PT3.PT3_Version <= 4)
; // a->amplitude = PT3VolumeTable_33_34[a->volume][a->amplitude];
; //}
; //else
; a->amplitude = PT3VolumeTable_35[a->volume][a->amplitude];
; if (((b0 & 0x1) == 0) && ( a->envelope_enabled)) {
; a->amplitude |= 16;
; }
; /* Frequency slide */
; /* If b1 top bits are 10 or 11 */
; if ((b1 & 0x80) != 0) {
; if ((b0 & 0x20) != 0) {
; j = ((b0>>1)|0xF0) + a->envelope_sliding;
; }
; else {
; j = ((b0>>1)&0xF) + a->envelope_sliding;
; }
; if (( b1 & 0x20) != 0) {
; a->envelope_sliding = j;
; }
; pt3->envelope_add+=j;
; }
; /* Noise slide */
; else {
; pt3->noise_add = (b0>>1) + a->noise_sliding;
; if ((b1 & 0x20) != 0) {
; a->noise_sliding = pt3->noise_add;
; }
; }
; pt3->mixer_value = ((b1 >>1) & 0x48) | pt3->mixer_value;
; a->sample_position++;
; if (a->sample_position >= a->sample_length) {
; a->sample_position = a->sample_loop;
; }
; a->ornament_position++;
; if (a->ornament_position >= a->ornament_length) {
; a->ornament_position = a->ornament_loop;
; }
;} else {
; a->amplitude=0;
;}
done_note:
; set mixer value
; this is a bit complex (from original code)
; after 3 calls it is set up properly
lda pt3_mixer_value
lsr
sta pt3_mixer_value
;if (a->onoff>0) {
; a->onoff--;
; if (a->onoff==0) {
; a->enabled=!a->enabled;
; if (a->enabled) a->onoff=a->onoff_delay;
; else a->onoff=a->offon_delay;
; }
;}
rts
prev_note: .byte $0
prev_sliding_l: .byte $0
prev_sliding_h: .byte $0
decode_done: .byte $0
current_val: .byte $0
;=====================================
; Decode Note
;=====================================
decode_note:
; Init vars
lda #0
sta note_a+NOTE_NEW_NOTE ; for printing notes?
sta note_a+NOTE_SPEC_COMMAND ; These are only if printing?
sta decode_done
; Skip decode if note still running
lda note_a+NOTE_LEN_COUNT
beq keep_decoding ; assume not negative
; we are still running, decrement and early return
dec note_a+NOTE_LEN_COUNT
rts
keep_decoding:
lda note_a+NOTE_NOTE ; store prev note
sta prev_note
lda note_a+NOTE_TONE_SLIDING_H ; store prev sliding
sta prev_sliding_h
lda note_a+NOTE_TONE_SLIDING_L
sta prev_sliding_l
note_decode_loop:
lda note_a+NOTE_LEN ; re-up length count
sta note_a+NOTE_LEN_COUNT
ldy #0
lda note_a+NOTE_ADDR_L
sta PATTERN_L
lda note_a+NOTE_ADDR_H
sta PATTERN_H
; get next value
lda (PATTERN_L),Y
tax ; save to X termporarily
; FIXME: use a jump table??
and #$f0
cmp #$00
bne decode_case_1X
decode_case_0X:
; if (current_val==0x0) {
; a->len_count=0;
; a->all_done=1;
; a_done=1;
; }
; else { /* FIXME: what if multiple spec commands? */
; /* Doesn't seem to happen in practice */
; /* But AY_emul has code to handle it */
; a->spec_command=current_val&0xf;
; }
; break;
decode_case_1X:
cmp #$10
bne decode_case_2X
; if ((current_val&0xf)==0x0) {
; a->envelope_enabled=0;
; }
; else {
; pt3->envelope_type_old=0x78;
; pt3->envelope_type=(current_val&0xf);
; (*addr)++;
; current_val=pt3->data[*addr];
; pt3->envelope_period=(current_val<<8);
; (*addr)++;
; current_val=pt3->data[(*addr)];
; pt3->envelope_period|=(current_val&0xff$
; a->envelope_enabled=1;
; pt3->envelope_slide=0;
; pt3->envelope_delay=0;
; }
; (*addr)++;
; current_val=pt3->data[(*addr)];
; a->sample=(current_val/2);
; pt3_load_sample(pt3,a->which);
; a->ornament_position=0;
; break;
decode_case_2X:
;==============================
; $2X set noise period
;==============================
cmp #$20
bne decode_case_3X
txa
and #$f
sta pt3_noise_period
jmp done_decode
decode_case_3X:
;==============================
; $3X set noise period (FIXME: merge with above)
;==============================
cmp #$30
bne decode_case_4X
txa
and #$0f
ora #$10
sta pt3_noise_period
jmp done_decode
decode_case_4X:
;==============================
; $4X
;==============================
cmp #$40
bne decode_case_5X
; a->ornament=(current_val&0xf);
; pt3_load_ornament(pt3,a->which);
; a->ornament_position=0;
; break;
decode_case_5X:
;==============================
; $5X-$AX set note
;==============================
cmp #$B0
bcs decode_case_bX ; branch greater/equal
txa
sec
sbc #$50
sta note_a+NOTE_NOTE ; note=(current_val-0x50);
lda #0
sta note_a+NOTE_SAMPLE_POSITION ; sample_position=0
sta note_a+NOTE_AMPLITUDE_SLIDING ; amplitude_sliding=0
sta note_a+NOTE_NOISE_SLIDING ; noise_sliding=0
sta note_a+NOTE_ENVELOPE_SLIDING ; envelope_sliding=0
sta note_a+NOTE_ORNAMENT_POSITION ; ornament_position=0
sta note_a+NOTE_TONE_SLIDE_COUNT ; tone_slide_count=0
sta note_a+NOTE_TONE_SLIDING_L ; tone_sliding=0
sta note_a+NOTE_TONE_SLIDING_H
sta note_a+NOTE_TONE_ACCUMULATOR_L ; tone_accumulator=0
sta note_a+NOTE_TONE_ACCUMULATOR_H
sta note_a+NOTE_ONOFF ; onoff=0;
lda #1
sta note_a+NOTE_NEW_NOTE ; new=1
sta note_a+NOTE_ENABLED ; enabled=1
sta decode_done ; decode_done-1
jmp done_decode
decode_case_bX:
;==============================
; $BX
;==============================
cmp #$b0
bne decode_case_cX
; /* Disable envelope */
; if (current_val==0xb0) {
; a->envelope_enabled=0;
; a->ornament_position=0;
; }
; /* set len */
; else if (current_val==0xb1) {
; (*addr)++;
; current_val=pt3->data[(*addr)];
; a->len=current_val;
; a->len_count=a->len;
; }
; else {
; a->envelope_enabled=1;
; pt3->envelope_type_old=0x78;
; pt3->envelope_type=(current_val&0xf)-1;
; (*addr)++;
; current_val=pt3->data[(*addr)];
; pt3->envelope_period=(current_val<<8);
; (*addr)++;
; current_val=pt3->data[(*addr)];
; pt3->envelope_period|=(current_val&0xff$
; a->ornament_position=0;
; pt3->envelope_slide=0;
; pt3->envelope_delay=0;
; }
; break;
decode_case_cX:
;==============================
; $CX
;==============================
cmp #$c0
bne decode_case_dX
; volume
; if ((current_val&0xf)==0) {
; a->sample_position=0;
; a->amplitude_sliding=0;
; a->noise_sliding=0;
; a->envelope_sliding=0;
; a->ornament_position=0;
; a->tone_slide_count=0;
; a->tone_sliding=0;
; a->tone_accumulator=0;
; a->onoff=0;
; a->enabled=0;
; a_done=1;
; }
; else {
; a->volume=current_val&0xf;
; }
; break;
decode_case_dX:
;==============================
; $DX
;==============================
cmp #$d0
bne decode_case_eX
; if (current_val==0xd0) {
; a_done=1;
; }
; else {
; a->sample=(current_val&0xf);
; pt3_load_sample(pt3,a->which);
; }
; break;
decode_case_eX:
;==============================
; $EX
;==============================
cmp #$e0
bne decode_case_fX
; a->sample=(current_val-0xd0);
; pt3_load_sample(pt3,a->which);
; break;
decode_case_fX:
;==============================
; $FX - change ornament/sample
;==============================
; disable envelope
lda #0
sta note_a+NOTE_ENVELOPE_ENABLED
; Set ornament to low byte of command
txa
and #$f
jsr load_ornament ; ornament to load in A
; Get next byte
iny ; point to next byte
lda (PATTERN_L),Y
; Set sample to value/2
lsr ; divide by two
jsr load_sample ; sample to load in A
; fallthrough
done_decode:
iny ; point to next byte
lda decode_done
bne handle_effects
jmp keep_decoding
handle_effects:
; /* Note, the AYemul code has code to make sure these are applied */
; /* In the same order they appear. We don't bother? */
; if (a_done) {
; if (a->spec_command==0x0) {
; }
; /* Tone Down */
; else if (a->spec_command==0x1) {
; current_val=pt3->data[(*addr)];
; a->spec_delay=current_val;
; a->tone_slide_delay=current_val;
; a->tone_slide_count=a->tone_slide_delay;
; (*addr)++;
; current_val=pt3->data[(*addr)];
; a->spec_lo=(current_val);
; (*addr)++;
; current_val=pt3->data[(*addr)];
; a->spec_hi=(current_val);
; a->tone_slide_step=(a->spec_lo)|(a->spec_hi<<8);
; /* Sign Extend */
; a->tone_slide_step=(a->tone_slide_step<<16)>>16;
; a->simplegliss=1;
; a->onoff=0;
; (*addr)++;
; }
; /* port */
; else if (a->spec_command==0x2) {
; a->simplegliss=0;
; a->onoff=0;
; current_val=pt3->data[(*addr)];
; a->spec_delay=current_val;
; a->tone_slide_delay=current_val;
; a->tone_slide_count=a->tone_slide_delay;
; (*addr)++;
; (*addr)++;
; (*addr)++;
; current_val=pt3->data[(*addr)];
; a->spec_lo=current_val;
; (*addr)++;
; current_val=pt3->data[(*addr)];
; a->spec_hi=current_val;
; (*addr)++;
; a->tone_slide_step=(a->spec_hi<<8)|(a->spec_lo);
; /* sign extend */
; a->tone_slide_step=(a->tone_slide_step<<16)>>16;
; /* abs() */
; if (a->tone_slide_step<0) a->tone_slide_step=-a$
; a->tone_delta=GetNoteFreq(a->note,pt3)-
; GetNoteFreq(prev_note,pt3);
; a->slide_to_note=a->note;
; a->note=prev_note;
; if (pt3->version >= 6) {
; a->tone_sliding = prev_sliding;
; }
; if ((a->tone_delta - a->tone_sliding) < 0) {
; a->tone_slide_step = -a->tone_slide_ste$
; }
; }
; /* Position in Sample */
; else if (a->spec_command==0x3) {
; current_val=pt3->data[(*addr)];
; a->sample_position=current_val;
; (*addr)++;
; }
; /* Position in Ornament */
; else if (a->spec_command==0x4) {
; current_val=pt3->data[(*addr)];
; a->ornament_position=current_val;
; (*addr)++;
; }
; /* Vibrato */
; else if (a->spec_command==0x5) {
; current_val=pt3->data[(*addr)];
; a->onoff_delay=current_val;
; (*addr)++;
; current_val=pt3->data[(*addr)];
; a->offon_delay=current_val;
; (*addr)++;
; a->onoff=a->onoff_delay;
; a->tone_slide_count=0;
; a->tone_sliding=0;
; }
; /* Envelope Down */
; else if (a->spec_command==0x8) {
; /* delay? */
; current_val=pt3->data[(*addr)];
; pt3->envelope_delay=current_val;
; pt3->envelope_delay_orig=current_val;
; a->spec_delay=current_val;
; (*addr)++;
; /* Low? */
; current_val=pt3->data[(*addr)];
; a->spec_lo=current_val&0xff;
; (*addr)++;
; /* High? */
; current_val=pt3->data[(*addr)];
; a->spec_hi=current_val&0xff;
; (*addr)++;
; pt3->envelope_slide_add=(a->spec_hi<<8)|(a->spe$
; /* Set Speed */
; else if (a->spec_command==0x9) {
; current_val=pt3->data[(*addr)];
; a->spec_lo=current_val;
; pt3->speed=current_val;
; (*addr)++;
; }
; break;
; }
rts
;=====================================
; Decode Line
;=====================================
pt3_decode_line:
; decode_note(&pt3->a,&(pt3->a_addr),pt3);
jsr decode_note
; decode_note(&pt3->b,&(pt3->b_addr),pt3);
jsr decode_note
; decode_note(&pt3->c,&(pt3->c_addr),pt3);
jsr decode_note
; if (pt3->a.all_done && pt3->b.all_done && pt3->c.all_done) {
; return 1;
; }
rts
current_subframe: .byte $0
current_line: .byte $0
current_pattern: .byte $0
;=====================================
; Set Pattern
;=====================================
pt3_set_pattern:
ldy current_pattern
lda PT3_LOC+PT3_PATTERN_TABLE,Y ; get pattern table value
asl ; mul by two, as word sized
tay
clc
lda PT3_LOC+PT3_PATTERN_LOC_L
sta PATTERN_L
lda PT3_LOC+PT3_PATTERN_LOC_H
adc #>PT3_LOC ; assume page boundary
sta PATTERN_H
lda (PATTERN_L),Y
sta note_a+NOTE_ADDR_L
iny
clc
lda (PATTERN_L),Y
adc #>PT3_LOC ; assume page boundary
sta note_a+NOTE_ADDR_H
iny
lda (PATTERN_L),Y
sta note_b+NOTE_ADDR_L
iny
lda (PATTERN_L),Y
adc #>PT3_LOC ; assume page boundary
sta note_b+NOTE_ADDR_H
iny
lda (PATTERN_L),Y
sta note_c+NOTE_ADDR_L
iny
lda (PATTERN_L),Y
adc #>PT3_LOC ; assume page boundary
sta note_c+NOTE_ADDR_H
lda #0
sta note_a+NOTE_ALL_DONE
sta note_b+NOTE_ALL_DONE
sta note_c+NOTE_ALL_DONE
sta pt3_noise_period
rts
;=====================================
; pt3 make frame
;=====================================
pt3_make_frame:
; for(i=0;i < pt3.music_len;i++) {
; pt3_set_pattern(i,&pt3);
; for(j=0;j<64;j++) {
; if (pt3_decode_line(&pt3)) break;
; see if we need a new pattern
; we do if line==0 and subframe==0
lda current_line
bne line_good
lda current_subframe
bne line_good
; load a new patterh in
jsr pt3_set_pattern
pattern_good:
; see if we need a new line
lda current_subframe
bne line_good
; decode a new line
jsr pt3_decode_line
line_good:
; Increment everything
inc current_subframe ; subframe++
lda current_subframe
cmp pt3_speed ; if we hit pt3_speed, move to next
bne do_frame
next_line:
lda #0 ; reset subframe to 0
sta current_subframe
inc current_line ; and increment line
; FIXME: not always 64
cmp #64 ; if not max, continue
bne do_frame
next_pattern:
lda #0 ; reset line to 0
sta current_line
inc current_pattern ; increment pattern
lda current_pattern
cmp pt3_music_len ; if end of song, mark it as so
beq done_song
jmp do_frame
done_song:
lda #$ff
sta DONE_PLAYING
rts
do_frame:
; AY-3-8910 register summary
;
; R0/R1 = A period low/high
; R2/R3 = B period low/high
; R4/R5 = C period low/high
; R6 = Noise period */
; R7 = Enable XX Noise=!CBA Tone=!CBA */
; R8/R9/R10 = Channel A/B/C amplitude M3210, M=envelope enable
; R11/R12 = Envelope Period low/high
; R13 = Envelope Shape, 0xff means don't write
; R14/R15 = I/O (ignored)
lda #0
sta pt3_mixer_value
sta pt3_envelope_add
lda #0 ; Note A
jsr calculate_note
lda #1 ; Note B
jsr calculate_note
lda #2 ; Note C
jsr calculate_note
; Load up the Frequency Registers
lda note_a+NOTE_TONE_L ; Note A Period L
sta REGISTER_DUMP+0 ; into R0
lda note_a+NOTE_TONE_H ; Note A Period H
sta REGISTER_DUMP+1 ; into R1
lda note_b+NOTE_TONE_L ; Note B Period L
sta REGISTER_DUMP+2 ; into R2
lda note_b+NOTE_TONE_H ; Note B Period H
sta REGISTER_DUMP+3 ; into R3
lda note_c+NOTE_TONE_L ; Note C Period L
sta REGISTER_DUMP+4 ; into R4
lda note_c+NOTE_TONE_H ; Note C Period H
sta REGISTER_DUMP+5 ; into R5
; Noise
; frame[6]= (pt3->noise_period+pt3->noise_add)&0x1f;
clc
lda pt3_noise_period
adc pt3_noise_add
and #$1f
sta REGISTER_DUMP+6
; Mixer
lda pt3_mixer_value
sta REGISTER_DUMP+7
; Amplitudes
lda note_a+NOTE_AMPLITUDE
sta REGISTER_DUMP+8
lda note_b+NOTE_AMPLITUDE
sta REGISTER_DUMP+9
lda note_c+NOTE_AMPLITUDE
sta REGISTER_DUMP+10
; Envelope period
; result=period+add+slide (16-bits)
clc
lda pt3_envelope_period_l
adc pt3_envelope_add
sta temp_word_l
lda pt3_envelope_period_h
adc #0
sta temp_word_h
clc
lda pt3_envelope_slide_l
adc temp_word_l
; sta temp_word_l
sta REGISTER_DUMP+11
lda temp_word_h
adc pt3_envelope_slide_h
; sta temp_word_h
sta REGISTER_DUMP+12
; Envelope shape
lda pt3_envelope_type
cmp pt3_envelope_type_old
bne envelope_diff
envelope_same:
lda #$ff ; if same, store $ff
envelope_diff:
sta REGISTER_DUMP+13
lda pt3_envelope_type
sta pt3_envelope_type_old ; copy old to new
lda pt3_envelope_delay
beq done_do_frame ; assume can't be negative?
; do this if envelope_delay>0
dec pt3_envelope_delay
bne done_do_frame
; only do if we hit 0
lda pt3_envelope_delay_orig ; reset envelope delay
sta pt3_envelope_delay
clc ; 16-bit add
lda pt3_envelope_slide_l
adc pt3_envelope_slide_add_l
sta pt3_envelope_slide_l
lda pt3_envelope_slide_h
adc pt3_envelope_slide_add_h
sta pt3_envelope_slide_h
done_do_frame:
rts
;======================================
; GetNoteFreq
;======================================
; Return frequency from lookup table
; Which note is in Y
; return in X,A (high,low)
GetNoteFreq:
lda PT3_LOC+PT3_HEADER_FREQUENCY
cmp #1
bne freq_table_2
lda PT3NoteTable_ST_high,Y
tax
lda PT3NoteTable_ST_low,Y
rts
freq_table_2:
lda PT3NoteTable_ASM_34_35_high,Y
tax
lda PT3NoteTable_ASM_34_35_low,Y
rts
; Table #1 of Pro Tracker 3.3x - 3.5x
PT3NoteTable_ST_high:
.byte $0E,$0E,$0D,$0C,$0B,$0B,$0A,$09
.byte $09,$08,$08,$07,$07,$07,$06,$06
.byte $05,$05,$05,$04,$04,$04,$04,$03
.byte $03,$03,$03,$03,$02,$02,$02,$02
.byte $02,$02,$02,$01,$01,$01,$01,$01
.byte $01,$01,$01,$01,$01,$01,$01,$00
.byte $00,$00,$00,$00,$00,$00,$00,$00
.byte $00,$00,$00,$00,$00,$00,$00,$00
.byte $00,$00,$00,$00,$00,$00,$00,$00
.byte $00,$00,$00,$00,$00,$00,$00,$00
.byte $00,$00,$00,$00,$00,$00,$00,$00
.byte $00,$00,$00,$00,$00,$00,$00,$00
PT3NoteTable_ST_low:
.byte $F8,$10,$60,$80,$D8,$28,$88,$F0
.byte $60,$E0,$58,$E0,$7C,$08,$B0,$40
.byte $EC,$94,$44,$F8,$B0,$70,$2C,$FD
.byte $BE,$84,$58,$20,$F6,$CA,$A2,$7C
.byte $58,$38,$16,$F8,$DF,$C2,$AC,$90
.byte $7B,$65,$51,$3E,$2C,$1C,$0A,$FC
.byte $EF,$E1,$D6,$C8,$BD,$B2,$A8,$9F
.byte $96,$8E,$85,$7E,$77,$70,$6B,$64
.byte $5E,$59,$54,$4F,$4B,$47,$42,$3F
.byte $3B,$38,$35,$32,$2F,$2C,$2A,$27
.byte $25,$23,$21,$1F,$1D,$1C,$1A,$19
.byte $17,$16,$15,$13,$12,$11,$10,$0F
; Table #2 of Pro Tracker 3.4x - 3.5x
PT3NoteTable_ASM_34_35_high:
.byte $0D,$0C,$0B,$0A,$0A,$09,$09,$08
.byte $08,$07,$07,$06,$06,$06,$05,$05
.byte $05,$04,$04,$04,$04,$03,$03,$03
.byte $03,$03,$02,$02,$02,$02,$02,$02
.byte $02,$01,$01,$01,$01,$01,$01,$01
.byte $01,$01,$01,$01,$01,$00,$00,$00
.byte $00,$00,$00,$00,$00,$00,$00,$00
.byte $00,$00,$00,$00,$00,$00,$00,$00
.byte $00,$00,$00,$00,$00,$00,$00,$00
.byte $00,$00,$00,$00,$00,$00,$00,$00
.byte $00,$00,$00,$00,$00,$00,$00,$00
.byte $00,$00,$00,$00,$00,$00,$00,$00
PT3NoteTable_ASM_34_35_low:
.byte $10,$55,$A4,$FC,$5F,$CA,$3D,$B8
.byte $3B,$C5,$55,$EC,$88,$2A,$D2,$7E
.byte $2F,$E5,$9E,$5C,$1D,$E2,$AB,$76
.byte $44,$15,$E9,$BF,$98,$72,$4F,$2E
.byte $0F,$F1,$D5,$BB,$A2,$8B,$74,$60
.byte $4C,$39,$28,$17,$07,$F9,$EB,$DD
.byte $D1,$C5,$BA,$B0,$A6,$9D,$94,$8C
.byte $84,$7C,$75,$6F,$69,$63,$5D,$58
.byte $53,$4E,$4A,$46,$42,$3E,$3B,$37
.byte $34,$31,$2F,$2C,$29,$27,$25,$23
.byte $21,$1F,$1D,$1C,$1A,$19,$17,$16
.byte $15,$14,$12,$11,$10,$0F,$0E,$0D
PT3VolumeTable_33_34:
.byte $0,$0,$0,$0,$0,$0,$0,$0,$0,$0,$0,$0,$0,$0,$0,$0
.byte $0,$0,$0,$0,$0,$0,$0,$0,$1,$1,$1,$1,$1,$1,$1,$1
.byte $0,$0,$0,$0,$0,$0,$1,$1,$1,$1,$1,$2,$2,$2,$2,$2
.byte $0,$0,$0,$0,$1,$1,$1,$1,$2,$2,$2,$2,$3,$3,$3,$3
.byte $0,$0,$0,$0,$1,$1,$1,$2,$2,$2,$3,$3,$3,$4,$4,$4
.byte $0,$0,$0,$1,$1,$1,$2,$2,$3,$3,$3,$4,$4,$4,$5,$5
.byte $0,$0,$0,$1,$1,$2,$2,$3,$3,$3,$4,$4,$5,$5,$6,$6
.byte $0,$0,$1,$1,$2,$2,$3,$3,$4,$4,$5,$5,$6,$6,$7,$7
.byte $0,$0,$1,$1,$2,$2,$3,$3,$4,$5,$5,$6,$6,$7,$7,$8
.byte $0,$0,$1,$1,$2,$3,$3,$4,$5,$5,$6,$6,$7,$8,$8,$9
.byte $0,$0,$1,$2,$2,$3,$4,$4,$5,$6,$6,$7,$8,$8,$9,$A
.byte $0,$0,$1,$2,$3,$3,$4,$5,$6,$6,$7,$8,$9,$9,$A,$B
.byte $0,$0,$1,$2,$3,$4,$4,$5,$6,$7,$8,$8,$9,$A,$B,$C
.byte $0,$0,$1,$2,$3,$4,$5,$6,$7,$7,$8,$9,$A,$B,$C,$D
.byte $0,$0,$1,$2,$3,$4,$5,$6,$7,$8,$9,$A,$B,$C,$D,$E
.byte $0,$1,$2,$3,$4,$5,$6,$7,$8,$9,$A,$B,$C,$D,$E,$F
PT3VolumeTable_35:
.byte $0,$0,$0,$0,$0,$0,$0,$0,$0,$0,$0,$0,$0,$0,$0,$0
.byte $0,$0,$0,$0,$0,$0,$0,$0,$1,$1,$1,$1,$1,$1,$1,$1
.byte $0,$0,$0,$0,$1,$1,$1,$1,$1,$1,$1,$1,$2,$2,$2,$2
.byte $0,$0,$0,$1,$1,$1,$1,$1,$2,$2,$2,$2,$2,$3,$3,$3
.byte $0,$0,$1,$1,$1,$1,$2,$2,$2,$2,$3,$3,$3,$3,$4,$4
.byte $0,$0,$1,$1,$1,$2,$2,$2,$3,$3,$3,$4,$4,$4,$5,$5
.byte $0,$0,$1,$1,$2,$2,$2,$3,$3,$4,$4,$4,$5,$5,$6,$6
.byte $0,$0,$1,$1,$2,$2,$3,$3,$4,$4,$5,$5,$6,$6,$7,$7
.byte $0,$1,$1,$2,$2,$3,$3,$4,$4,$5,$5,$6,$6,$7,$7,$8
.byte $0,$1,$1,$2,$2,$3,$4,$4,$5,$5,$6,$7,$7,$8,$8,$9
.byte $0,$1,$1,$2,$3,$3,$4,$5,$5,$6,$7,$7,$8,$9,$9,$A
.byte $0,$1,$1,$2,$3,$4,$4,$5,$6,$7,$7,$8,$9,$A,$A,$B
.byte $0,$1,$2,$2,$3,$4,$5,$6,$6,$7,$8,$9,$A,$A,$B,$C
.byte $0,$1,$2,$3,$3,$4,$5,$6,$7,$8,$9,$A,$A,$B,$C,$D
.byte $0,$1,$2,$3,$4,$5,$6,$7,$7,$8,$9,$A,$B,$C,$D,$E
.byte $0,$1,$2,$3,$4,$5,$6,$7,$8,$9,$A,$B,$C,$D,$E,$F