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pt3: work on translating more C to assembly

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This commit is contained in:
Vince Weaver 2019-05-09 00:28:52 -04:00
parent 295422db3b
commit 7a1c5e7cb4
1 changed files with 109 additions and 14 deletions
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123
pt3_player/pt3_lib.s
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@ -53,12 +53,19 @@ note_c:
.byte $0 ; NOTE_TONE_H
.byte $0 ; NOTE_AMPLITUDE
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: .byte $0
pt3_envelope_add: .byte $0
pt3_envelope_type: .byte $0
pt3_envelope_type_old: .byte $0
pt3_current_pattern: .byte $0
pt3_music_len: .byte $0
@ -115,8 +122,17 @@ pt3_init_song:
; 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:
;if (a->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];
@ -164,8 +180,21 @@ calculate_note:
; a->amplitude+=a->amplitude_sliding;
; if (a->amplitude < 0) a->amplitude = 0;
; else if (a->amplitude > 15) a->amplitude = 15;
; 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];
@ -214,7 +243,13 @@ calculate_note:
; a->amplitude=0;
;}
;pt3->mixer_value=pt3->mixer_value>>1;
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--;
@ -236,6 +271,28 @@ decode_note:
rts
;=====================================
; Decode Line
;=====================================
pt3_decode_line:
rts
;=====================================
; Set Pattern
;=====================================
pt3_set_pattern:
rts
current_subframe: .byte $0
current_line: .byte $0
current_pattern: .byte $0
;=====================================
; pt3 make frame
;=====================================
@ -244,8 +301,42 @@ pt3_make_frame:
; pt3_set_pattern(i,&pt3);
; for(j=0;j<64;j++) {
; if (pt3_decode_line(&pt3)) break;
; for(f=0;f<pt3.speed;f++) {
next_subframe:
inc current_subframe ; for(f=0;f<pt3.speed;f++) {
lda current_subframe
cmp pt3_speed
bne do_frame
next_line:
lda #0
sta current_subframe
jsr pt3_decode_line
inc current_line
cmp #64
bne do_frame
next_pattern:
lda #0
sta current_line
inc current_pattern
lda current_pattern
cmp pt3_music_len
beq done_song
jsr pt3_set_pattern
jmp do_frame
done_song:
lda #$ff
sta DONE_PLAYING
rts
do_frame:
; AY-3-8910 register summary
;
; R0/R1 = A period low/high
@ -314,15 +405,19 @@ pt3_make_frame:
; frame[11]=(temp_envelope&0xff);
; frame[12]=(temp_envelope>>8);
; Envelope shape
; if (pt3->envelope_type==pt3->envelope_type_old) {
; frame[13]=0xff;
; }
; else {
; frame[13]=pt3->envelope_type;
; }
; pt3->envelope_type_old=pt3->envelope_type;
;
; 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
; if (pt3->envelope_delay > 0) {
; pt3->envelope_delay--;
; if (pt3->envelope_delay==0) {