mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-12-30 07:30:04 +00:00
579 lines
13 KiB
ArmAsm
579 lines
13 KiB
ArmAsm
;========================================================================
|
|
; EVERYTHING IS CYCLE COUNTED
|
|
;========================================================================
|
|
|
|
;=====================================
|
|
; Calculate Note
|
|
;=====================================
|
|
; note offset in X
|
|
|
|
; FIXME: samples shouldn't cross page boundary
|
|
|
|
; 7 -- first check
|
|
; 38 -- note enabled
|
|
; 20 -- sample1
|
|
; 30 -- sample2
|
|
; 21 -- accumulate
|
|
; 15 -- calc tone
|
|
; 12 -- note bounds
|
|
; 50 -- more tone
|
|
|
|
; 44 -- done note
|
|
;=====
|
|
;
|
|
|
|
; note disabled = 7 + 6 + [????] + 44 = 57
|
|
|
|
calculate_note:
|
|
lda note_a+NOTE_ENABLED,X ; 4
|
|
bne note_enabled ; 3
|
|
|
|
;-1
|
|
sta note_a+NOTE_AMPLITUDE,X ; 4
|
|
jmp done_note ; 3
|
|
|
|
note_enabled:
|
|
|
|
lda note_a+NOTE_SAMPLE_POINTER_H,X ; 4
|
|
sta SAMPLE_H ; 3
|
|
lda note_a+NOTE_SAMPLE_POINTER_L,X ; 4
|
|
sta SAMPLE_L ; 3
|
|
|
|
lda note_a+NOTE_ORNAMENT_POINTER_H,X ; 4
|
|
sta ORNAMENT_H ; 3
|
|
lda note_a+NOTE_ORNAMENT_POINTER_L,X ; 4
|
|
sta ORNAMENT_L ; 3
|
|
|
|
|
|
lda note_a+NOTE_SAMPLE_POSITION,X ; 4
|
|
asl ; 2
|
|
asl ; 2
|
|
tay ; 2
|
|
;===========
|
|
; 38
|
|
|
|
; b0 = pt3->data[a->sample_pointer + a->sample_position * 4];
|
|
lda (SAMPLE_L),Y ; 5+
|
|
sta sample_b0_smc+1 ; 4
|
|
|
|
; b1 = pt3->data[a->sample_pointer + a->sample_position * 4 + 1];
|
|
iny ; 2
|
|
lda (SAMPLE_L),Y ; 5+
|
|
sta sample_b1_smc+1 ; 4
|
|
;=============
|
|
; 20
|
|
|
|
; 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;
|
|
iny ; 2
|
|
lda (SAMPLE_L),Y ; 5+
|
|
adc note_a+NOTE_TONE_ACCUMULATOR_L,X ; 4
|
|
sta note_a+NOTE_TONE_L,X ; 4
|
|
|
|
iny ; 2
|
|
lda (SAMPLE_L),Y ; 5+
|
|
adc note_a+NOTE_TONE_ACCUMULATOR_H,X ; 4
|
|
sta note_a+NOTE_TONE_H,X ; 4
|
|
;============
|
|
; 30
|
|
|
|
;=============================
|
|
; Accumulate tone if set
|
|
; (if sample_b1 & $40)
|
|
; set = 7+14 = 21
|
|
; no-set = 7+[14] = 21
|
|
bit sample_b1_smc+1 ; 4
|
|
bvc no_accum_waste ; (so, if b1&0x40 is zero, skip it) ; 3
|
|
|
|
; -1
|
|
|
|
sta note_a+NOTE_TONE_ACCUMULATOR_H,X ; 4
|
|
lda note_a+NOTE_TONE_L,X ; tone_accumulator=tone ; 4
|
|
sta note_a+NOTE_TONE_ACCUMULATOR_L,X ; 4
|
|
jmp no_accum_real ; 3
|
|
no_accum_waste:
|
|
inc CYCLE_WASTE ; 5
|
|
inc CYCLE_WASTE ; 5
|
|
nop ; 2
|
|
nop ; 2
|
|
|
|
no_accum_real:
|
|
;============
|
|
; 21
|
|
;============================
|
|
; Calculate tone
|
|
; j = a->note + (pt3->data[a->ornament_pointer + a->ornament_position]
|
|
|
|
|
|
clc ;;can be removed if ADC ACCUMULATOR_H cannot overflow ; 2
|
|
ldy note_a+NOTE_ORNAMENT_POSITION,X ; 4
|
|
lda (ORNAMENT_L),Y ; 5+
|
|
adc note_a+NOTE_NOTE,X ; 4
|
|
;============
|
|
; 15
|
|
|
|
; <0 -- 3+4+[5] = 12
|
|
; >95 -- 3+5+4 = 12
|
|
; just right --3+5+[4] = 12
|
|
|
|
; if (j < 0) j = 0;
|
|
bpl note_not_negative ; 3
|
|
; -1
|
|
lda #0 ; 2
|
|
jmp note_just_right_waste5 ; 3
|
|
|
|
; if (j > 95) j = 95;
|
|
note_not_negative:
|
|
cmp #96 ; 2
|
|
bcc note_not_too_high ; blt ; 3
|
|
; -1
|
|
lda #95 ; 2
|
|
jmp note_just_right_waste4 ; 3
|
|
note_not_too_high:
|
|
|
|
note_just_right_waste5:
|
|
nop ; 2
|
|
jmp note_just_right ; 3
|
|
note_just_right_waste4:
|
|
nop ; 2
|
|
nop ; 2
|
|
;===========
|
|
; 12
|
|
note_just_right:
|
|
|
|
; w = GetNoteFreq(j,pt3->frequency_table);
|
|
|
|
tay ; for GetNoteFreq later ; 2
|
|
|
|
; a->tone = (a->tone + a->tone_sliding + w) & 0xfff;
|
|
|
|
clc ; 2
|
|
lda note_a+NOTE_TONE_SLIDING_L,X ; 4
|
|
adc note_a+NOTE_TONE_L,X ; 4
|
|
sta temp_word_l1_smc+1 ; 4
|
|
|
|
lda note_a+NOTE_TONE_H,X ; 4
|
|
adc note_a+NOTE_TONE_SLIDING_H,X ; 4
|
|
sta temp_word_h1_smc+1 ; 4
|
|
|
|
clc ;;can be removed if ADC SLIDING_H cannot overflow ; 2
|
|
temp_word_l1_smc:
|
|
lda #$d1 ; 2
|
|
adc NoteTable_low,Y ; GetNoteFreq ; 4
|
|
sta note_a+NOTE_TONE_L,X ; 4
|
|
temp_word_h1_smc:
|
|
lda #$d1 ; 2
|
|
adc NoteTable_high,Y ; GetNoteFreq ; 4
|
|
and #$0f ; 2
|
|
sta note_a+NOTE_TONE_H,X ; 4
|
|
|
|
;===========
|
|
; 50
|
|
|
|
;=====================
|
|
; handle tone sliding
|
|
|
|
; if (a->tone_slide_count > 0) {
|
|
|
|
lda note_a+NOTE_TONE_SLIDE_COUNT,X ; 4
|
|
bmi no_tone_sliding ; 3
|
|
; -1
|
|
beq no_tone_sliding ; 3
|
|
; -1
|
|
; a->tone_slide_count--;
|
|
dec note_a+NOTE_TONE_SLIDE_COUNT,X ; 6
|
|
; if (a->tone_slide_count==0) {
|
|
bne no_tone_sliding ; 3
|
|
; -1
|
|
|
|
; a->tone_sliding+=a->tone_slide_step
|
|
clc ;;can be removed if ADC freq_h cannot overflow ; 2
|
|
lda note_a+NOTE_TONE_SLIDING_L,X ; 4
|
|
adc note_a+NOTE_TONE_SLIDE_STEP_L,X ; 4
|
|
sta note_a+NOTE_TONE_SLIDING_L,X ; 4
|
|
tay ; save NOTE_TONE_SLIDING_L in y ; 2
|
|
lda note_a+NOTE_TONE_SLIDING_H,X ; 4
|
|
adc note_a+NOTE_TONE_SLIDE_STEP_H,X ; 4
|
|
sta note_a+NOTE_TONE_SLIDING_H,X ; 4
|
|
|
|
; a->tone_slide_count = a->tone_slide_delay;
|
|
lda note_a+NOTE_TONE_SLIDE_DELAY,X ; 4
|
|
sta note_a+NOTE_TONE_SLIDE_COUNT,X ; 4
|
|
|
|
lda note_a+NOTE_SIMPLE_GLISS,X ; 4
|
|
bne no_tone_sliding ; if (!a->simplegliss) { ; 3
|
|
; -1
|
|
check1:
|
|
lda note_a+NOTE_TONE_SLIDE_STEP_H,X ; 4
|
|
bpl check2 ; 3
|
|
; if ( ((a->tone_slide_step < 0) && ; -1
|
|
; (a->tone_sliding <= a->tone_delta) ||
|
|
|
|
; 16 bit signed compare
|
|
tya ; y has NOTE_TONE_SLIDING_L ; 2
|
|
cmp note_a+NOTE_TONE_DELTA_L,X ; NUM1-NUM2 ; 4
|
|
lda note_a+NOTE_TONE_SLIDING_H,X ; 4
|
|
sbc note_a+NOTE_TONE_DELTA_H,X ; 4
|
|
bvc sc_loser1 ; N eor V ; 3
|
|
; -1
|
|
eor #$80 ; 2
|
|
sc_loser1:
|
|
; then A (signed) < NUM (signed) and BMI will branch
|
|
bmi slide_to_note ; 3
|
|
; -1
|
|
; equals case
|
|
tya ; y has NOTE_TONE_SLIDING_L ; 2
|
|
cmp note_a+NOTE_TONE_DELTA_L,X ; 4
|
|
bne check2 ; 3
|
|
; -1
|
|
lda note_a+NOTE_TONE_SLIDING_H,X ; 4
|
|
cmp note_a+NOTE_TONE_DELTA_H,X ; 4
|
|
beq slide_to_note ; 3
|
|
; -1
|
|
check2:
|
|
lda note_a+NOTE_TONE_SLIDE_STEP_H,X ; 4
|
|
bmi no_tone_sliding ; 3
|
|
; ((a->tone_slide_step >= 0) &&
|
|
; (a->tone_sliding >= a->tone_delta)
|
|
; -1
|
|
; 16 bit signed compare
|
|
tya ; y has NOTE_TONE_SLIDING_L ; 2
|
|
cmp note_a+NOTE_TONE_DELTA_L,X ; num1-num2 ; 4
|
|
lda note_a+NOTE_TONE_SLIDING_H,X ; 4
|
|
sbc note_a+NOTE_TONE_DELTA_H,X ; 4
|
|
bvc sc_loser2 ; N eor V ; 3
|
|
; -1
|
|
eor #$80 ; 2
|
|
sc_loser2:
|
|
; then A (signed) < NUM (signed) and BMI will branch
|
|
bmi no_tone_sliding ; 3
|
|
; -1
|
|
|
|
slide_to_note:
|
|
; a->note = a->slide_to_note;
|
|
lda note_a+NOTE_SLIDE_TO_NOTE,X ; 4
|
|
sta note_a+NOTE_NOTE,X ; 4
|
|
lda #0 ; 2
|
|
sta note_a+NOTE_TONE_SLIDE_COUNT,X ; 4
|
|
sta note_a+NOTE_TONE_SLIDING_L,X ; 4
|
|
sta note_a+NOTE_TONE_SLIDING_H,X ; 4
|
|
|
|
|
|
no_tone_sliding:
|
|
|
|
;=========================
|
|
; Calculate the amplitude
|
|
;=========================
|
|
calc_amplitude:
|
|
; get base value from the sample (bottom 4 bits of sample_b1)
|
|
|
|
sample_b1_smc:
|
|
lda #$d1 ; a->amplitude= (b1 & 0xf); ; 2
|
|
and #$f ; 2
|
|
|
|
;========================================
|
|
; if b0 top bit is set, it means sliding
|
|
|
|
; adjust amplitude sliding
|
|
|
|
bit sample_b0_smc+1 ; if ((b0 & 0x80)!=0) { ; 4
|
|
bpl done_amp_sliding ; so if top bit not set, skip ; 3
|
|
; -1
|
|
tay ; 2
|
|
|
|
;================================
|
|
; if top bits 0b11 then slide up
|
|
; if top bits 0b10 then slide down
|
|
|
|
; if ((b0 & 0x40)!=0) {
|
|
lda note_a+NOTE_AMPLITUDE_SLIDING,X ; 4
|
|
sec ; 2
|
|
bvc amp_slide_down ; 3
|
|
; -1
|
|
amp_slide_up:
|
|
; if (a->amplitude_sliding < 15) {
|
|
; a pain to do signed compares
|
|
sbc #15 ; 2
|
|
bvc asu_signed ; 3
|
|
; -1
|
|
eor #$80 ; 2
|
|
asu_signed:
|
|
bpl done_amp_sliding ; skip if A>=15 ; 2
|
|
; a->amplitude_sliding++;
|
|
inc note_a+NOTE_AMPLITUDE_SLIDING,X ; 5?
|
|
bne done_amp_sliding_y ; 3
|
|
; -1
|
|
|
|
amp_slide_down:
|
|
; if (a->amplitude_sliding > -15) {
|
|
; a pain to do signed compares
|
|
sbc #$f1 ; -15 ; 2
|
|
bvc asd_signed ; 3
|
|
; -1
|
|
eor #$80 ; 2
|
|
asd_signed:
|
|
bmi done_amp_sliding ; if A < -15, skip subtract ; 3
|
|
|
|
; a->amplitude_sliding--;
|
|
dec note_a+NOTE_AMPLITUDE_SLIDING,X ; 5?
|
|
|
|
done_amp_sliding_y:
|
|
tya ; 2
|
|
|
|
done_amp_sliding:
|
|
|
|
; a->amplitude+=a->amplitude_sliding;
|
|
clc ; 2
|
|
adc note_a+NOTE_AMPLITUDE_SLIDING,X ; 4
|
|
|
|
; clamp amplitude to 0 - 15
|
|
|
|
check_amp_lo:
|
|
bmi write_clamp_amplitude ; 3
|
|
; -1
|
|
|
|
check_amp_hi:
|
|
cmp #16 ; 2
|
|
bcc write_amplitude ; blt ; 3
|
|
; -1
|
|
lda #15 ; 2
|
|
.byte $2C ;????
|
|
write_clamp_amplitude:
|
|
lda #0 ;????
|
|
write_amplitude:
|
|
sta note_amp_smc+1 ; 4
|
|
|
|
done_clamp_amplitude:
|
|
|
|
; We generate the proper table at runtime now
|
|
; so always in Volume Table
|
|
; a->amplitude = PT3VolumeTable_33_34[a->volume][a->amplitude];
|
|
; a->amplitude = PT3VolumeTable_35[a->volume][a->amplitude];
|
|
|
|
lda note_a+NOTE_VOLUME,X ; 4
|
|
asl ; 2
|
|
asl ; 2
|
|
asl ; 2
|
|
asl ; 2
|
|
note_amp_smc:
|
|
ora #$d1 ; 2
|
|
|
|
tay ; 2
|
|
lda VolumeTable,Y ; 4
|
|
sta note_a+NOTE_AMPLITUDE,X ; 4
|
|
|
|
done_table:
|
|
|
|
|
|
check_envelope_enable:
|
|
; Bottom bit of b0 indicates our sample has envelope
|
|
; Also make sure envelopes are enabled
|
|
|
|
|
|
; if (((b0 & 0x1) == 0) && ( a->envelope_enabled)) {
|
|
sample_b0_smc:
|
|
lda #$d1 ; 2
|
|
lsr ; 2
|
|
tay ; 2
|
|
bcs envelope_slide ; 3
|
|
; -1
|
|
|
|
lda note_a+NOTE_ENVELOPE_ENABLED,X ; 4
|
|
beq envelope_slide ; 3
|
|
; -1
|
|
|
|
|
|
; Bit 4 of the per-channel AY-3-8910 amplitude specifies
|
|
; envelope enabled
|
|
|
|
lda note_a+NOTE_AMPLITUDE,X ; a->amplitude |= 16; ; 4
|
|
ora #$10 ; 2
|
|
sta note_a+NOTE_AMPLITUDE,X ; 4
|
|
|
|
|
|
envelope_slide:
|
|
|
|
; Envelope slide
|
|
; If b1 top bits are 10 or 11
|
|
|
|
lda sample_b0_smc+1 ; 4
|
|
asl ; 2
|
|
asl ; 2
|
|
asl ; b0 bit 5 to carry flag ; 2
|
|
lda #$20 ; 2
|
|
; b1 bit 7 to sign flag, bit 5 to zero flag
|
|
bit sample_b1_smc+1 ; 4?
|
|
php ; 4?
|
|
bpl else_noise_slide ; if ((b1 & 0x80) != 0) { ; 3
|
|
; -1
|
|
tya ; 2
|
|
ora #$f0 ; 2
|
|
bcs envelope_slide_down ; if ((b0 & 0x20) == 0) { ; 3
|
|
; -1
|
|
envelope_slide_up:
|
|
; j = ((b0>>1)&0xF) + a->envelope_sliding;
|
|
and #$0f ; 2
|
|
clc ; 2
|
|
|
|
envelope_slide_down:
|
|
|
|
; j = ((b0>>1)|0xF0) + a->envelope_sliding
|
|
adc note_a+NOTE_ENVELOPE_SLIDING,X ; 4
|
|
sta e_slide_amount_smc+1 ; j ; 4
|
|
|
|
envelope_slide_done:
|
|
|
|
plp ; 4?
|
|
beq last_envelope ; if (( b1 & 0x20) != 0) { ; 3
|
|
; -1
|
|
|
|
; a->envelope_sliding = j;
|
|
sta note_a+NOTE_ENVELOPE_SLIDING,X ; 4
|
|
|
|
last_envelope:
|
|
|
|
; pt3->envelope_add+=j;
|
|
|
|
clc ; 2
|
|
e_slide_amount_smc:
|
|
lda #$d1 ; 2
|
|
adc pt3_envelope_add_smc+1 ; 4
|
|
sta pt3_envelope_add_smc+1 ; 4
|
|
|
|
jmp noise_slide_done ; skip else ; 3
|
|
|
|
else_noise_slide:
|
|
; Noise slide
|
|
; else {
|
|
|
|
; pt3->noise_add = (b0>>1) + a->noise_sliding;
|
|
tya ; 2
|
|
clc ; 2
|
|
adc note_a+NOTE_NOISE_SLIDING,X ; 4
|
|
sta pt3_noise_add_smc+1 ; 4
|
|
|
|
plp ; 4?
|
|
beq noise_slide_done ; if ((b1 & 0x20) != 0) { ; 3
|
|
; -1
|
|
; noise_sliding = pt3_noise_add
|
|
sta note_a+NOTE_NOISE_SLIDING,X ; 4
|
|
|
|
noise_slide_done:
|
|
;======================
|
|
; set mixer
|
|
|
|
; pt3->mixer_value = ((b1 >>1) & 0x48) | pt3->mixer_value;
|
|
lda sample_b1_smc+1 ; 4
|
|
lsr ; 2
|
|
and #$48 ; 2
|
|
|
|
ora PT3_MIXER_VAL ; 3
|
|
sta PT3_MIXER_VAL ; 3
|
|
|
|
|
|
;========================
|
|
; increment sample position
|
|
|
|
; a->sample_position++;
|
|
inc note_a+NOTE_SAMPLE_POSITION,X ; 5?
|
|
|
|
lda note_a+NOTE_SAMPLE_POSITION,X ; 4
|
|
cmp note_a+NOTE_SAMPLE_LENGTH,X ; 4
|
|
|
|
bcc sample_pos_ok ; blt ; 3
|
|
; -1
|
|
|
|
lda note_a+NOTE_SAMPLE_LOOP,X ; 4
|
|
sta note_a+NOTE_SAMPLE_POSITION,X ; 4
|
|
|
|
sample_pos_ok:
|
|
|
|
;============================
|
|
; increment ornament position
|
|
|
|
; a->ornament_position++;
|
|
inc note_a+NOTE_ORNAMENT_POSITION,X ; 5?
|
|
lda note_a+NOTE_ORNAMENT_POSITION,X ; 4
|
|
cmp note_a+NOTE_ORNAMENT_LENGTH,X ; 4
|
|
|
|
bcc ornament_pos_ok ; blt ; 3
|
|
; -1
|
|
|
|
lda note_a+NOTE_ORNAMENT_LOOP,X ; 4
|
|
sta note_a+NOTE_ORNAMENT_POSITION,X ; 4
|
|
ornament_pos_ok:
|
|
|
|
|
|
done_note:
|
|
; set mixer value
|
|
; this is a bit complex (from original code)
|
|
; after 3 calls it is set up properly
|
|
lsr PT3_MIXER_VAL ; 5
|
|
|
|
;=============================
|
|
; 7+ [26] + 6 = 39 // onoff==0
|
|
; 7+ 4 + 12 + 6 + 4 + 6 = 39 // onoff counted down to 0, do_onoff
|
|
; 7+ 4 + 12 + 6 + 4 + 6 = 39 // onoff counted down to 0, do_offon
|
|
; 7+ 4 + [18] + 4 + 6 = 39 // otherwise
|
|
|
|
handle_onoff:
|
|
ldy note_a+NOTE_ONOFF,X ;if (a->onoff>0) { ; 4
|
|
beq done_onoff_kill_26 ; 3
|
|
;============
|
|
; 7
|
|
|
|
; -1
|
|
|
|
dey ; a->onoff--; ; 2
|
|
bne put_offon_kill_18 ; if (a->onoff==0) { ; 3
|
|
;============
|
|
; 4
|
|
|
|
; -1
|
|
lda note_a+NOTE_ENABLED,X ; 4
|
|
eor #$1 ; toggle note_enabled ; 2
|
|
sta note_a+NOTE_ENABLED,X ; 4
|
|
beq do_offon ; 3
|
|
;============
|
|
; 12
|
|
do_onoff:
|
|
; -1
|
|
; if (a->enabled) a->onoff=a->onoff_delay;
|
|
ldy note_a+NOTE_ONOFF_DELAY,X ; 4
|
|
jmp put_offon ; 3
|
|
;============
|
|
; 6
|
|
do_offon:
|
|
; else a->onoff=a->offon_delay;
|
|
ldy note_a+NOTE_OFFON_DELAY,X ; 4
|
|
nop ; make things match ; 2
|
|
;============
|
|
; 6
|
|
|
|
put_offon:
|
|
sty note_a+NOTE_ONOFF,X ; 4
|
|
;============
|
|
; 4
|
|
done_onoff:
|
|
|
|
rts ; 6
|
|
|
|
done_onoff_kill_26:
|
|
inc CYCLE_WASTE ; 5
|
|
lda CYCLE_WASTE ; 3
|
|
inc CYCLE_WASTE ; 5
|
|
inc CYCLE_WASTE ; 5
|
|
inc CYCLE_WASTE ; 5
|
|
jmp done_onoff ; 3
|
|
|
|
put_offon_kill_18:
|
|
inc CYCLE_WASTE ; 5
|
|
inc CYCLE_WASTE ; 5
|
|
inc CYCLE_WASTE ; 5
|
|
jmp put_offon ; 3
|
|
|
|
|
|
|
|
|