mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-12-29 00:31:52 +00:00
pt3: more comments and cycle counting
This commit is contained in:
Vince Weaver
parent
f775b116da
commit
5b2ad332e4
@ -220,7 +220,7 @@ convert_177: .byte $1
|
||||
|
||||
; Header offsets
|
||||
|
||||
PT3_VERSION = $D
|
||||
PT3_VERSION = $0D
|
||||
PT3_HEADER_FREQUENCY = $63
|
||||
PT3_SPEED = $64
|
||||
PT3_LOOP = $66
|
||||
@ -236,6 +236,14 @@ ysave: .byte $00
|
||||
freq_l: .byte $00
|
||||
freq_h: .byte $00
|
||||
|
||||
e_slide_amount: .byte $0
|
||||
|
||||
prev_note: .byte $0
|
||||
prev_sliding_l: .byte $0
|
||||
prev_sliding_h: .byte $0
|
||||
decode_done: .byte $0
|
||||
current_val: .byte $0
|
||||
|
||||
;===========================
|
||||
; Load Ornament
|
||||
;===========================
|
||||
@ -338,7 +346,7 @@ load_sample:
|
||||
|
||||
clc ; 2
|
||||
asl ; A*2 ; 2
|
||||
adc #PT3_SAMPLE_LOC_L ; 2
|
||||
adc #PT3_SAMPLE_LOC_L ; 2
|
||||
tay ; 2
|
||||
|
||||
; Set the initial sample pointer
|
||||
@ -476,7 +484,7 @@ not_ascii_number:
|
||||
|
||||
|
||||
|
||||
e_slide_amount: .byte $0
|
||||
|
||||
|
||||
|
||||
;=====================================
|
||||
@ -966,11 +974,7 @@ done_onoff:
|
||||
|
||||
rts
|
||||
|
||||
prev_note: .byte $0
|
||||
prev_sliding_l: .byte $0
|
||||
prev_sliding_h: .byte $0
|
||||
decode_done: .byte $0
|
||||
current_val: .byte $0
|
||||
|
||||
|
||||
;=====================================
|
||||
; Decode Note
|
||||
@ -1652,89 +1656,99 @@ current_pattern: .byte $0
|
||||
;=====================================
|
||||
; Set Pattern
|
||||
;=====================================
|
||||
; FIXME: inline this? we do call it from outside
|
||||
; in the player note length code
|
||||
|
||||
pt3_set_pattern:
|
||||
|
||||
ldy current_pattern
|
||||
lda PT3_LOC+PT3_PATTERN_TABLE,Y ; get pattern table value
|
||||
; Lookup current pattern in pattern table
|
||||
ldy current_pattern ; 4
|
||||
lda PT3_LOC+PT3_PATTERN_TABLE,Y ; 4+
|
||||
|
||||
cmp #$ff
|
||||
bne not_done
|
||||
; if value is $FF we are at the end of the song
|
||||
cmp #$ff ; 2
|
||||
bne not_done ; 2/3
|
||||
|
||||
sta DONE_SONG
|
||||
rts
|
||||
; done with song, set it to non-zero
|
||||
sta DONE_SONG ; 3
|
||||
rts ; 6
|
||||
;============
|
||||
; 21 if end
|
||||
|
||||
not_done:
|
||||
|
||||
asl ; mul by two, as word sized
|
||||
tay
|
||||
; set up the three pattern address pointers
|
||||
|
||||
clc
|
||||
asl ; mul pattern offset by two, as word sized ; 2
|
||||
tay ; 2
|
||||
|
||||
lda PT3_LOC+PT3_PATTERN_LOC_L
|
||||
sta PATTERN_L
|
||||
lda PT3_LOC+PT3_PATTERN_LOC_H
|
||||
adc #>PT3_LOC ; assume page boundary
|
||||
sta PATTERN_H
|
||||
; point PATTERN_H/PATTERN_L to the pattern address table
|
||||
|
||||
lda (PATTERN_L),Y
|
||||
sta note_a+NOTE_ADDR_L
|
||||
iny
|
||||
clc ; 2
|
||||
lda PT3_LOC+PT3_PATTERN_LOC_L ; 4
|
||||
sta PATTERN_L ; 3
|
||||
lda PT3_LOC+PT3_PATTERN_LOC_H ; 4
|
||||
adc #>PT3_LOC ; assume page boundary ; 2
|
||||
sta PATTERN_H ; 3
|
||||
|
||||
clc
|
||||
lda (PATTERN_L),Y
|
||||
adc #>PT3_LOC ; assume page boundary
|
||||
sta note_a+NOTE_ADDR_H
|
||||
iny
|
||||
; First 16-bits points to the Channel A address
|
||||
lda (PATTERN_L),Y ; 5+
|
||||
sta note_a+NOTE_ADDR_L ; 4
|
||||
iny ; 2
|
||||
clc ; needed? ; 2
|
||||
lda (PATTERN_L),Y ; 5+
|
||||
adc #>PT3_LOC ; assume page boundary ; 2
|
||||
sta note_a+NOTE_ADDR_H ; 4
|
||||
iny ; 2
|
||||
|
||||
lda (PATTERN_L),Y
|
||||
sta note_b+NOTE_ADDR_L
|
||||
iny
|
||||
; Next 16-bits points to the Channel B address
|
||||
lda (PATTERN_L),Y ; 5+
|
||||
sta note_b+NOTE_ADDR_L ; 4
|
||||
iny ; 2
|
||||
lda (PATTERN_L),Y ; 5+
|
||||
adc #>PT3_LOC ; assume page boundary ; 2
|
||||
sta note_b+NOTE_ADDR_H ; 4
|
||||
iny ; 2
|
||||
|
||||
lda (PATTERN_L),Y
|
||||
adc #>PT3_LOC ; assume page boundary
|
||||
sta note_b+NOTE_ADDR_H
|
||||
iny
|
||||
; Next 16-bits points to the Channel C address
|
||||
lda (PATTERN_L),Y ; 5+
|
||||
sta note_c+NOTE_ADDR_L ; 4
|
||||
iny ; 2
|
||||
lda (PATTERN_L),Y ; 5+
|
||||
adc #>PT3_LOC ; assume page boundary ; 2
|
||||
sta note_c+NOTE_ADDR_H ; 4
|
||||
|
||||
lda (PATTERN_L),Y
|
||||
sta note_c+NOTE_ADDR_L
|
||||
iny
|
||||
; clear out the noise channel
|
||||
lda #0 ; 2
|
||||
sta pt3_noise_period ; 4
|
||||
|
||||
lda (PATTERN_L),Y
|
||||
adc #>PT3_LOC ; assume page boundary
|
||||
sta note_c+NOTE_ADDR_H
|
||||
; Set all three channels as active
|
||||
; FIXME: num_channels, may need to be 6 if doing 6-channel pt3?
|
||||
lda #3 ; 2
|
||||
sta pt3_pattern_done ; 4
|
||||
|
||||
lda #0
|
||||
sta pt3_noise_period
|
||||
|
||||
lda #3 ; FIXME: num_channels
|
||||
sta pt3_pattern_done
|
||||
|
||||
|
||||
|
||||
rts
|
||||
rts ; 6
|
||||
|
||||
|
||||
|
||||
;=====================================
|
||||
; pt3 make frame
|
||||
;=====================================
|
||||
pt3_make_frame:
|
||||
; for(i=0;i < pt3.music_len;i++) {
|
||||
; pt3_set_pattern(i,&pt3);
|
||||
; for(j=0;j<64;j++) {
|
||||
; if (pt3_decode_line(&pt3)) break;
|
||||
; update pattern or line if necessary
|
||||
; then calculate the values for the next frame
|
||||
|
||||
|
||||
pt3_make_frame:
|
||||
|
||||
; see if we need a new pattern
|
||||
; we do if line==0 and subframe==0
|
||||
lda current_line
|
||||
bne pattern_good
|
||||
lda current_subframe
|
||||
bne pattern_good
|
||||
lda current_line ; 4
|
||||
bne pattern_good ; 2/3
|
||||
lda current_subframe ; 4
|
||||
bne pattern_good ; 2/3
|
||||
|
||||
; load a new pattern in
|
||||
jsr pt3_set_pattern
|
||||
jsr pt3_set_pattern ;6+?
|
||||
|
||||
lda DONE_SONG
|
||||
beq pattern_good
|
||||
|
||||
Loading…
Reference in New Issue
Block a user