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pt3: a lot of decoding is done

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This commit is contained in:
Vince Weaver 2019-05-10 13:09:05 -04:00
parent d4fdeb27ea
commit 2668b01f28
1 changed files with 119 additions and 57 deletions
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176
pt3_player/pt3_lib.s
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@ -472,48 +472,84 @@ note_decode_loop:
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;
; }
;==============================
; $0X set special effect
;==============================
txa
and #$f
bne decode_case_0X_not_zero
; Do we ever actually hit this case?
sta note_a+NOTE_LEN_COUNT ; len_count=0;
lda #1
sta note_a+NOTE_ALL_DONE
sta decode_done
jmp done_decode
decode_case_0X_not_zero:
; FIXME: what if multiple spec commands?
; Doesn't seem to happen in practice
; But AY_emul has code to handle it
sta note_a+NOTE_SPEC_COMMAND
jmp done_decode
decode_case_1X:
;==============================
; $1X -- Set Envelope Type
;==============================
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);
txa
and #$0f
bne decode_case_not_10
; (*addr)++;
; current_val=pt3->data[*addr];
; pt3->envelope_period=(current_val<<8);
decode_case_10:
sta note_a+NOTE_ENVELOPE_ENABLED
jmp decode_case_1x_common
; (*addr)++;
; current_val=pt3->data[(*addr)];
; pt3->envelope_period|=(current_val&0xff$
decode_case_not_10:
; Needed?
; FIXME: combine this with the BX code somehow?
; pt3->envelope_type_old=0x78;
; 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);
sta pt3_envelope_type
; a->ornament_position=0;
; get next byte
iny
lda (PATTERN_L),Y
sta pt3_envelope_period_h
iny
lda (PATTERN_L),Y
sta pt3_envelope_period_l
lda #0
sta pt3_envelope_delay ; envelope_delay=0
sta pt3_envelope_slide_l ; envelope_slide=0
sta pt3_envelope_slide_h
lda #1
sta note_a+NOTE_ENVELOPE_ENABLED ; envelope_enabled=1
decode_case_1x_common:
iny ; FIXME: combine?
lda (PATTERN_L),Y
lsr
jsr load_sample
lda #0
sta note_a+NOTE_ORNAMENT_POSITION ; ornament_position=0
jmp done_decode
@ -599,33 +635,59 @@ decode_case_bX:
cmp #$b0
bne decode_case_cX
txa
and #$f
beq decode_case_b0
cmp #1
beq decode_case_b1
jmp decode_case_bx_higher
; /* 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;
; }
decode_case_b0:
; Disable envelope
lda #0
sta note_a+NOTE_ENVELOPE_ENABLED
sta note_a+NOTE_ORNAMENT_POSITION
jmp done_decode
decode_case_b1:
; Set Length
; get next byte
iny
lda (PATTERN_L),Y
sta note_a+NOTE_LEN
sta note_a+NOTE_LEN_COUNT
jmp done_decode
decode_case_bx_higher:
; give fake old to force update? maybe only needed if printing?
; pt3->envelope_type_old=0x78;
sec
sbc #1
sta pt3_envelope_type ; envelope_type=(current_val&0xf)-1;
; get next byte
iny
lda (PATTERN_L),Y
sta pt3_envelope_period_h
; get next byte
iny
lda (PATTERN_L),Y
sta pt3_envelope_period_l
lda #0
sta note_a+NOTE_ORNAMENT_POSITION ; ornament_position=0
sta pt3_envelope_slide_l ; envelope_slide=0
sta pt3_envelope_slide_h
sta pt3_envelope_delay ; envelope_delay=0
lda #1
sta note_a+NOTE_ENVELOPE_ENABLED ; envelope_enabled=1;
jmp done_decode
decode_case_cX: