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https://github.com/deater/dos33fsprogs.git
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pt3: more decoding
This commit is contained in:
Vince Weaver
parent
f5fb9e1ad7
commit
22aaa1a3f4
@ -289,6 +289,7 @@ done_name_loop:
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jsr print_cout
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jsr CROUT1
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jsr CROUT1
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jsr pt3_init_song
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@ -29,6 +29,15 @@ NOTE_ORNAMENT_POINTER_L=21
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NOTE_ORNAMENT_POINTER_H=22
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NOTE_ORNAMENT_LOOP=23
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NOTE_ORNAMENT_LENGTH=24
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NOTE_ONOFF=25
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NOTE_TONE_ACCUMULATOR_L=26
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NOTE_TONE_ACCUMULATOR_H=27
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NOTE_TONE_SLIDE_COUNT=28
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NOTE_ORNAMENT_POSITION=29
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NOTE_SAMPLE_POSITION=30
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NOTE_ENVELOPE_SLIDING=31
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NOTE_NOISE_SLIDING=32
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NOTE_AMPLITUDE_SLIDING=33
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note_a:
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.byte 'A' ; NOTE_WHICH
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@ -56,6 +65,15 @@ note_a:
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.byte $0 ; NOTE_ORNAMENT_POINTER_H
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.byte $0 ; NOTE_ORNAMENT_LOOP
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.byte $0 ; NOTE_ORNAMENT_LENGTH
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.byte $0 ; NOTE_ONOFF
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.byte $0 ; NOTE_TONE_ACCUMULATOR_L
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.byte $0 ; NOTE_TONE_ACCUMULATOR_H
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.byte $0 ; NOTE_TONE_SLIDE_COUNT
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.byte $0 ; NOTE_ORNAMENT_POSITION
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.byte $0 ; NOTE_SAMPLE_POSITION
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.byte $0 ; NOTE_ENVELOPE_SLIDING
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.byte $0 ; NOTE_NOISE_SLIDING
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.byte $0 ; NOTE_AMPLITUDE_SLIDING
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note_b:
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.byte 'B' ; NOTE_WHICH
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@ -83,6 +101,15 @@ note_b:
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.byte $0 ; NOTE_ORNAMENT_POINTER_H
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.byte $0 ; NOTE_ORNAMENT_LOOP
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.byte $0 ; NOTE_ORNAMENT_LENGTH
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.byte $0 ; NOTE_ONOFF
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.byte $0 ; NOTE_TONE_ACCUMULATOR_L
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.byte $0 ; NOTE_TONE_ACCUMULATOR_H
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.byte $0 ; NOTE_TONE_SLIDE_COUNT
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.byte $0 ; NOTE_ORNAMENT_POSITION
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.byte $0 ; NOTE_SAMPLE_POSITION
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.byte $0 ; NOTE_ENVELOPE_SLIDING
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.byte $0 ; NOTE_NOISE_SLIDING
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.byte $0 ; NOTE_AMPLITUDE_SLIDING
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note_c:
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.byte 'C' ; NOTE_WHICH
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@ -110,6 +137,15 @@ note_c:
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.byte $0 ; NOTE_ORNAMENT_POINTER_H
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.byte $0 ; NOTE_ORNAMENT_LOOP
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.byte $0 ; NOTE_ORNAMENT_LENGTH
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.byte $0 ; NOTE_ONOFF
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.byte $0 ; NOTE_TONE_ACCUMULATOR_L
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.byte $0 ; NOTE_TONE_ACCUMULATOR_H
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.byte $0 ; NOTE_TONE_SLIDE_COUNT
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.byte $0 ; NOTE_ORNAMENT_POSITION
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.byte $0 ; NOTE_SAMPLE_POSITION
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.byte $0 ; NOTE_ENVELOPE_SLIDING
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.byte $0 ; NOTE_NOISE_SLIDING
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.byte $0 ; NOTE_AMPLITUDE_SLIDING
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pt3_version: .byte $0
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pt3_frequency_table: .byte $0
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@ -378,7 +414,7 @@ done_note:
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prev_note: .byte $0
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prev_sliding_l: .byte $0
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prev_sliding_h: .byte $0
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a_done: .byte $0
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decode_done: .byte $0
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current_val: .byte $0
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;=====================================
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@ -392,7 +428,7 @@ decode_note:
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lda #0
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sta note_a+NOTE_NEW_NOTE ; for printing notes?
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sta note_a+NOTE_SPEC_COMMAND ; These are only if printing?
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sta a_done
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sta decode_done
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; Skip decode if note still running
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lda note_a+NOTE_LEN_COUNT
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@ -426,12 +462,16 @@ note_decode_loop:
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; get next value
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lda (PATTERN_L),Y
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tax ; save to X termporarily
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blah: jmp blah
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; FIXME: use a jump table??
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; current_val=pt3->data[*addr];
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; switch((current_val>>4)&0xf) {
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; case 0:
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and #$f0
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cmp #$00
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bne decode_case_1X
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decode_case_0X:
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; if (current_val==0x0) {
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; a->len_count=0;
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; a->all_done=1;
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@ -443,7 +483,10 @@ blah: jmp blah
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; a->spec_command=current_val&0xf;
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; }
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; break;
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; case 1:
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decode_case_1X:
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cmp #$10
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bne decode_case_2X
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; if ((current_val&0xf)==0x0) {
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; a->envelope_enabled=0;
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; }
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@ -472,38 +515,84 @@ blah: jmp blah
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; a->ornament_position=0;
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; break;
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; case 2:
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; pt3->noise_period=(current_val&0xf);
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; break;
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; case 3:
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; pt3->noise_period=(current_val&0xf)+0x10;
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; break;
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; case 4:
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decode_case_2X:
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;==============================
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; $2X set noise period
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;==============================
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cmp #$20
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bne decode_case_3X
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txa
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and #$f
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sta pt3_noise_period
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jmp done_decode
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decode_case_3X:
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;==============================
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; $3X set noise period (FIXME: merge with above)
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;==============================
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cmp #$30
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bne decode_case_4X
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txa
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and #$0f
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ora #$10
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sta pt3_noise_period
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jmp done_decode
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decode_case_4X:
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;==============================
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; $4X
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;==============================
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cmp #$40
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bne decode_case_5X
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; a->ornament=(current_val&0xf);
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; pt3_load_ornament(pt3,a->which);
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; a->ornament_position=0;
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; break;
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; case 5:
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; case 6:
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; case 7:
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; case 8:
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; case 9:
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; case 0xa:
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; a->new_note=1;
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; a->note=(current_val-0x50);
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; a->sample_position=0;
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; a->amplitude_sliding=0;
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; a->noise_sliding=0;
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; a->envelope_sliding=0;
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; a->ornament_position=0;
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; a->tone_slide_count=0;
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; a->tone_sliding=0;
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; a->tone_accumulator=0;
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; a->onoff=0;
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; a->enabled=1;
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; a_done=1;
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; break;
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; case 0xb:
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decode_case_5X:
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;==============================
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; $5X-$AX set note
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;==============================
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cmp #$B0
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bcs decode_case_bX ; branch greater/equal
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txa
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sec
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sbc #$50
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sta note_a+NOTE_NOTE ; note=(current_val-0x50);
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lda #0
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sta note_a+NOTE_SAMPLE_POSITION ; sample_position=0
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sta note_a+NOTE_AMPLITUDE_SLIDING ; amplitude_sliding=0
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sta note_a+NOTE_NOISE_SLIDING ; noise_sliding=0
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sta note_a+NOTE_ENVELOPE_SLIDING ; envelope_sliding=0
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sta note_a+NOTE_ORNAMENT_POSITION ; ornament_position=0
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sta note_a+NOTE_TONE_SLIDE_COUNT ; tone_slide_count=0
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sta note_a+NOTE_TONE_SLIDING_L ; tone_sliding=0
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sta note_a+NOTE_TONE_SLIDING_H
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sta note_a+NOTE_TONE_ACCUMULATOR_L ; tone_accumulator=0
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sta note_a+NOTE_TONE_ACCUMULATOR_H
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sta note_a+NOTE_ONOFF ; onoff=0;
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lda #1
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sta note_a+NOTE_NEW_NOTE ; new=1
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sta note_a+NOTE_ENABLED ; enabled=1
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sta decode_done ; decode_done-1
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jmp done_decode
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decode_case_bX:
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;==============================
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; $BX
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;==============================
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cmp #$b0
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bne decode_case_cX
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; /* Disable envelope */
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; if (current_val==0xb0) {
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; a->envelope_enabled=0;
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@ -531,7 +620,14 @@ blah: jmp blah
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; pt3->envelope_delay=0;
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; }
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; break;
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; case 0xc: /* volume */
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decode_case_cX:
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;==============================
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; $CX
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;==============================
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cmp #$c0
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bne decode_case_dX
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; volume
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; if ((current_val&0xf)==0) {
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; a->sample_position=0;
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; a->amplitude_sliding=0;
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@ -549,7 +645,13 @@ blah: jmp blah
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; a->volume=current_val&0xf;
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; }
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; break;
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; case 0xd:
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decode_case_dX:
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;==============================
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; $DX
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;==============================
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cmp #$d0
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bne decode_case_eX
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; if (current_val==0xd0) {
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; a_done=1;
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; }
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@ -558,24 +660,50 @@ blah: jmp blah
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; pt3_load_sample(pt3,a->which);
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; }
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; break;
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; case 0xe:
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decode_case_eX:
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;==============================
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; $EX
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;==============================
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cmp #$e0
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bne decode_case_fX
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; a->sample=(current_val-0xd0);
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; pt3_load_sample(pt3,a->which);
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; break;
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; case 0xf:
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; a->envelope_enabled=0;
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; a->ornament=(current_val&0xf);
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; pt3_load_ornament(pt3,a->which);
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; (*addr)++;
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; current_val=pt3->data[*addr];
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; a->sample=current_val/2;
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; a->sample_pointer=pt3->sample_patterns[a->sampl$
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; pt3_load_sample(pt3,a->which);
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; break;
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; }
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decode_case_fX:
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;==============================
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; $FX - change ornament/sample
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;==============================
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; (*addr)++;
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; disable envelope
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lda #0
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sta note_a+NOTE_ENVELOPE_ENABLED
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; Set ornament to low byte of command
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txa
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and #$f
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jsr load_ornament ; ornament to load in A
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; Get next byte
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iny ; point to next byte
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lda (PATTERN_L),Y
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; Set sample to value/2
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lsr ; divide by two
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jsr load_sample ; sample to load in A
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; fallthrough
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done_decode:
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iny ; point to next byte
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lda decode_done
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bne handle_effects
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jmp keep_decoding
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handle_effects:
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; /* Note, the AYemul code has code to make sure these are applied */
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; /* In the same order they appear. We don't bother? */
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; if (a_done) {
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@ -775,8 +903,6 @@ pt3_set_pattern:
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sta pt3_noise_period
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blah4: jmp blah4
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rts
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