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pt3: more comments and cycle counting
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@ -220,7 +220,7 @@ convert_177: .byte $1
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; Header offsets
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PT3_VERSION = $D
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PT3_VERSION = $0D
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PT3_HEADER_FREQUENCY = $63
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PT3_SPEED = $64
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PT3_LOOP = $66
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@ -236,6 +236,14 @@ ysave: .byte $00
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freq_l: .byte $00
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freq_h: .byte $00
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e_slide_amount: .byte $0
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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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decode_done: .byte $0
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current_val: .byte $0
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;===========================
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; Load Ornament
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;===========================
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@ -338,7 +346,7 @@ load_sample:
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clc ; 2
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asl ; A*2 ; 2
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adc #PT3_SAMPLE_LOC_L ; 2
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adc #PT3_SAMPLE_LOC_L ; 2
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tay ; 2
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; Set the initial sample pointer
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@ -476,7 +484,7 @@ not_ascii_number:
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e_slide_amount: .byte $0
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;=====================================
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@ -966,11 +974,7 @@ done_onoff:
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rts
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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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decode_done: .byte $0
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current_val: .byte $0
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;=====================================
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; Decode Note
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@ -1652,89 +1656,99 @@ current_pattern: .byte $0
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;=====================================
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; Set Pattern
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;=====================================
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; FIXME: inline this? we do call it from outside
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; in the player note length code
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pt3_set_pattern:
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ldy current_pattern
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lda PT3_LOC+PT3_PATTERN_TABLE,Y ; get pattern table value
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; Lookup current pattern in pattern table
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ldy current_pattern ; 4
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lda PT3_LOC+PT3_PATTERN_TABLE,Y ; 4+
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cmp #$ff
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bne not_done
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; if value is $FF we are at the end of the song
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cmp #$ff ; 2
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bne not_done ; 2/3
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sta DONE_SONG
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rts
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; done with song, set it to non-zero
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sta DONE_SONG ; 3
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rts ; 6
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;============
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; 21 if end
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not_done:
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asl ; mul by two, as word sized
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tay
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; set up the three pattern address pointers
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clc
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asl ; mul pattern offset by two, as word sized ; 2
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tay ; 2
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lda PT3_LOC+PT3_PATTERN_LOC_L
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sta PATTERN_L
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lda PT3_LOC+PT3_PATTERN_LOC_H
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adc #>PT3_LOC ; assume page boundary
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sta PATTERN_H
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; point PATTERN_H/PATTERN_L to the pattern address table
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lda (PATTERN_L),Y
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sta note_a+NOTE_ADDR_L
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iny
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clc ; 2
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lda PT3_LOC+PT3_PATTERN_LOC_L ; 4
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sta PATTERN_L ; 3
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lda PT3_LOC+PT3_PATTERN_LOC_H ; 4
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adc #>PT3_LOC ; assume page boundary ; 2
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sta PATTERN_H ; 3
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clc
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lda (PATTERN_L),Y
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adc #>PT3_LOC ; assume page boundary
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sta note_a+NOTE_ADDR_H
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iny
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; First 16-bits points to the Channel A address
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lda (PATTERN_L),Y ; 5+
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sta note_a+NOTE_ADDR_L ; 4
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iny ; 2
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clc ; needed? ; 2
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lda (PATTERN_L),Y ; 5+
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adc #>PT3_LOC ; assume page boundary ; 2
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sta note_a+NOTE_ADDR_H ; 4
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iny ; 2
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lda (PATTERN_L),Y
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sta note_b+NOTE_ADDR_L
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iny
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; Next 16-bits points to the Channel B address
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lda (PATTERN_L),Y ; 5+
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sta note_b+NOTE_ADDR_L ; 4
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iny ; 2
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lda (PATTERN_L),Y ; 5+
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adc #>PT3_LOC ; assume page boundary ; 2
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sta note_b+NOTE_ADDR_H ; 4
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iny ; 2
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lda (PATTERN_L),Y
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adc #>PT3_LOC ; assume page boundary
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sta note_b+NOTE_ADDR_H
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iny
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; Next 16-bits points to the Channel C address
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lda (PATTERN_L),Y ; 5+
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sta note_c+NOTE_ADDR_L ; 4
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iny ; 2
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lda (PATTERN_L),Y ; 5+
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adc #>PT3_LOC ; assume page boundary ; 2
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sta note_c+NOTE_ADDR_H ; 4
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lda (PATTERN_L),Y
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sta note_c+NOTE_ADDR_L
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iny
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; clear out the noise channel
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lda #0 ; 2
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sta pt3_noise_period ; 4
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lda (PATTERN_L),Y
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adc #>PT3_LOC ; assume page boundary
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sta note_c+NOTE_ADDR_H
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; Set all three channels as active
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; FIXME: num_channels, may need to be 6 if doing 6-channel pt3?
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lda #3 ; 2
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sta pt3_pattern_done ; 4
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lda #0
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sta pt3_noise_period
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lda #3 ; FIXME: num_channels
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sta pt3_pattern_done
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rts
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rts ; 6
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;=====================================
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; pt3 make frame
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;=====================================
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pt3_make_frame:
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; for(i=0;i < pt3.music_len;i++) {
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; pt3_set_pattern(i,&pt3);
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; for(j=0;j<64;j++) {
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; if (pt3_decode_line(&pt3)) break;
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; update pattern or line if necessary
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; then calculate the values for the next frame
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pt3_make_frame:
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; see if we need a new pattern
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; we do if line==0 and subframe==0
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lda current_line
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bne pattern_good
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lda current_subframe
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bne pattern_good
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lda current_line ; 4
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bne pattern_good ; 2/3
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lda current_subframe ; 4
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bne pattern_good ; 2/3
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; load a new pattern in
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jsr pt3_set_pattern
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jsr pt3_set_pattern ;6+?
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lda DONE_SONG
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beq pattern_good
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