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dos33fsprogs/demos/trogdor/pt3_lib_init.s
Vince Weaver bf0693a7c6 trogdor: probably ill-advised new demo
2024-01-11 01:25:38 -05:00

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; pt3_lib_init.s
; Initialize a song
; this is done before song starts playing so it is not
; as performance / timing critical
;====================================
; pt3_init_song
;====================================
;
pt3_init_song:
lda #$0
sta DONE_SONG ; 3
ldx #(end_vars-begin_vars)
zero_song_structs_loop:
dex
sta note_a,X
bne zero_song_structs_loop
sta pt3_noise_period_smc+1 ; 4
sta pt3_noise_add_smc+1 ; 4
sta pt3_envelope_period_l_smc+1 ; 4
sta pt3_envelope_period_h_smc+1 ; 4
sta pt3_envelope_slide_l_smc+1 ; 4
sta pt3_envelope_slide_h_smc+1 ; 4
sta pt3_envelope_slide_add_l_smc+1 ; 4
sta pt3_envelope_slide_add_h_smc+1 ; 4
sta pt3_envelope_add_smc+1 ; 4
sta pt3_envelope_type_smc+1 ; 4
sta pt3_envelope_type_old_smc+1 ; 4
sta pt3_envelope_delay_smc+1 ; 4
sta pt3_envelope_delay_orig_smc+1 ; 4
sta PT3_MIXER_VAL ; 3
sta current_pattern_smc+1 ; 4
sta current_line_smc+1 ; 4
sta current_subframe_smc+1 ; 4
lda #$f ; 2
sta note_a+NOTE_VOLUME ; 4
sta note_b+NOTE_VOLUME ; 4
sta note_c+NOTE_VOLUME ; 4
; default ornament/sample in A
; X is zero coming in here
;ldx #(NOTE_STRUCT_SIZE*0) ; 2
jsr load_ornament0_sample1 ; 6+93
; default ornament/sample in B
ldx #(NOTE_STRUCT_SIZE*1) ; 2
jsr load_ornament0_sample1 ; 6+93
; default ornament/sample in C
ldx #(NOTE_STRUCT_SIZE*2) ; 2
jsr load_ornament0_sample1 ; 6+93
;=======================
; load default speed
lda PT3_LOC+PT3_SPEED ; 4
sta pt3_speed_smc+1 ; 4
;=======================
; load loop
lda PT3_LOC+PT3_LOOP ; 4
sta pt3_loop_smc+1 ; 4
;========================
;========================
; set up note/freq table
; this saves some space and makes things marginally faster longrun
;========================
;========================
; note (heh) that there are separate tables if version 3.3
; but we are going to assume we are only going to be playing
; newer 3.4+ version files so only need the newer tables
ldx PT3_LOC+PT3_HEADER_FREQUENCY ; 4
beq use_freq_table_0
dex
beq use_freq_table_1
dex
beq use_freq_table_2
; fallthrough (freq table 3)
use_freq_table_3:
;=================================================
; Create Table #3, v4+, "PT3NoteTable_REAL_34_35"
;=================================================
ldy #11 ; !2
freq_table_3_copy_loop:
; note, high lookup almost same as 2v4, just need to adjust one value
lda base2_v4_high,Y ; !3
sta NoteTable_high,Y ; !3
lda base3_low,Y ; !3
sta NoteTable_low,Y ; !3
dey ; !1
bpl freq_table_3_copy_loop ; !2
dec NoteTable_high ; adjust to right value
jsr NoteTablePropogate ; !3
lda #<table3_v4_adjust
sta note_table_adjust_smc+1
lda #>table3_v4_adjust
sta note_table_adjust_smc+2
jsr NoteTableAdjust
jmp done_set_freq_table
use_freq_table_2:
;=================================================
; Create Table #2, v4+, "PT3NoteTable_ASM_34_35"
;=================================================
ldy #11
freq_table_2_copy_loop:
lda base2_v4_high,Y
sta NoteTable_high,Y
lda base2_v4_low,Y
sta NoteTable_low,Y
dey
bpl freq_table_2_copy_loop
jsr NoteTablePropogate ; !3
lda #<table2_v4_adjust
sta note_table_adjust_smc+1
lda #>table2_v4_adjust
sta note_table_adjust_smc+2
jsr NoteTableAdjust
jmp done_set_freq_table
use_freq_table_1:
;=================================================
; Create Table #1, "PT3NoteTable_ST"
;=================================================
ldy #11
freq_table_1_copy_loop:
lda base1_high,Y
sta NoteTable_high,Y
lda base1_low,Y
sta NoteTable_low,Y
dey
bpl freq_table_1_copy_loop
jsr NoteTablePropogate ; !3
; last adjustments
lda #$FD ; Tone[23]=$3FD
sta NoteTable_low+23
dec NoteTable_low+46 ; Tone[46]-=1;
jmp done_set_freq_table
use_freq_table_0:
;=================================================
; Create Table #0, "PT3NoteTable_PT_34_35"
;=================================================
ldy #11
freq_table_0_copy_loop:
lda base0_v4_high,Y
sta NoteTable_high,Y
lda base0_v4_low,Y
sta NoteTable_low,Y
dey
bpl freq_table_0_copy_loop
jsr NoteTablePropogate ; !3
lda #<table0_v4_adjust
sta note_table_adjust_smc+1
lda #>table0_v4_adjust
sta note_table_adjust_smc+2
jsr NoteTableAdjust
done_set_freq_table:
;======================
; calculate version
ldx #6 ; 2
lda PT3_LOC+PT3_VERSION ; 4
sec ; 2
sbc #'0' ; 2
cmp #9 ; 2
bcs not_ascii_number ; bge ; 2/3
tax ; 2
not_ascii_number:
; adjust version<6 SMC code in the slide code
; FIXME: I am sure there's a more clever way to do this
lda #$2C ; BIT ; 2
cpx #$6 ; 2
bcs version_greater_than_or_equal_6 ; bgt ; 3
; less than 6, jump
; also carry is known to be clear
adc #$20 ; BIT->JMP 2C->4C ; 2
version_greater_than_or_equal_6:
sta version_smc ; 4
pick_volume_table:
;=======================
; Pick which volume number, based on version
; if (PlParams.PT3.PT3_Version <= 4)
cpx #5 ; 2
; carry clear = 3.3/3.4 table
; carry set = 3.5 table
;==========================
; VolTableCreator
;==========================
; Creates the appropriate volume table
; based on z80 code by Ivan Roshin ZXAYHOBETA/VTII10bG.asm
;
; Called with carry==0 for 3.3/3.4 table
; Called with carry==1 for 3.5 table
; 177f-1932 = 435 bytes, not that much better than 512 of lookup
VolTableCreator:
; Init initial variables
lda #$0
sta z80_d_smc+1
ldy #$11
; Set up self modify
ldx #$2A ; ROL for self-modify
bcs vol_type_35
vol_type_33:
; For older table, we set initial conditions a bit
; different
dey
tya
ldx #$ea ; NOP for self modify
vol_type_35:
sty z80_l_smc+1 ; l=16 or 17
sta z80_e_smc+1 ; e=16 or 0
stx vol_smc ; set the self-modify code
ldy #16 ; skip first row, all zeros
ldx #16 ; c=16
vol_outer:
clc ; add HL,DE
z80_l_smc:
lda #$d1
z80_e_smc:
adc #$d1
sta z80_e_smc+1
lda #0
z80_d_smc:
adc #$d1
sta z80_d_smc+1 ; carry is important
; sbc hl,hl
lda #0
adc #$ff
eor #$ff
vol_write:
sta z80_h_smc+1
pha
vol_inner:
pla
pha
vol_smc:
nop ; nop or ROL depending
z80_h_smc:
lda #$d1
adc #$0 ; a=a+carry;
sta VolumeTable,Y
iny
pla ; add HL,DE
adc z80_e_smc+1
pha
lda z80_h_smc+1
adc z80_d_smc+1
sta z80_h_smc+1
inx ; inc C
txa ; a=c
and #$f
bne vol_inner
pla
lda z80_e_smc+1 ; a=e
cmp #$77
bne vol_m3
inc z80_e_smc+1
vol_m3:
txa ; a=c
bne vol_outer
vol_done:
rts
;=========================================
; copy note table seed to proper location
;=========================================
; faster inlined
;NoteTableCopy:
; ldy #11 ; !2
;note_table_copy_loop:
;ntc_smc1:
; lda base1_high,Y ; !3
; sta NoteTable_high,Y ; !3
;ntc_smc2:
; lda base1_low,Y ; !3
; sta NoteTable_low,Y ; !3
; dey ; !1
; bpl note_table_copy_loop ; !2
; rts ; !1
;==========================================
; propogate the freq down, dividing by two
;==========================================
NoteTablePropogate:
ldy #0
note_table_propogate_loop:
clc
lda NoteTable_high,Y
ror
sta NoteTable_high+12,Y
lda NoteTable_low,Y
ror
sta NoteTable_low+12,Y
iny
cpy #84
bne note_table_propogate_loop
rts
;================================================
; propogation isn't enough, various values
; are often off by one, so adjust using a bitmask
;================================================
NoteTableAdjust:
ldx #0
note_table_adjust_outer:
note_table_adjust_smc:
lda table0_v4_adjust,X
sta PT3_TEMP
; reset smc
lda #<NoteTable_low
sta ntl_smc+1
lda #>NoteTable_low
sta ntl_smc+2
ldy #7
note_table_adjust_inner:
ror PT3_TEMP
bcc note_table_skip_adjust
ntl_smc:
inc NoteTable_low,X
note_table_skip_adjust:
clc
lda #12
adc ntl_smc+1
sta ntl_smc+1
lda #0
adc ntl_smc+2 ; unnecessary if aligned
sta ntl_smc+2
skip_adjust_done:
dey
bpl note_table_adjust_inner
inx
cpx #12
bne note_table_adjust_outer
rts
;base0_v3_high:
;.byte $0C,$0B,$0A,$0A,$09,$09,$08,$08,$07,$07,$06,$06
;base0_v3_low:
;.byte $21,$73,$CE,$33,$A0,$16,$93,$18,$A4,$36,$CE,$6D
; note: same as base0_v3_high
base0_v4_high:
.byte $0C,$0B,$0A,$0A,$09,$09,$08,$08,$07,$07,$06,$06
base0_v4_low:
.byte $22,$73,$CF,$33,$A1,$17,$94,$19,$A4,$37,$CF,$6D
base1_high:
.byte $0E,$0E,$0D,$0C,$0B,$0B,$0A,$09,$09,$08,$08,$07
base1_low:
.byte $F8,$10,$60,$80,$D8,$28,$88,$F0,$60,$E0,$58,$E0
;base2_v3_high:
;.byte $0D,$0C,$0B,$0B,$0A,$09,$09,$08,$08,$07,$07,$07
;base2_v3_low:
;.byte $3E,$80,$CC,$22,$82,$EC,$5C,$D6,$58,$E0,$6E,$04
; note almost same as above
base2_v4_high:
.byte $0D,$0C,$0B,$0A,$0A,$09,$09,$08,$08,$07,$07,$06
base2_v4_low:
.byte $10,$55,$A4,$FC,$5F,$CA,$3D,$B8,$3B,$C5,$55,$EC
; note almost same as above
;base3_high:
;.byte $0C,$0C,$0B,$0A,$0A,$09,$09,$08,$08,$07,$07,$06
base3_low:
.byte $DA,$22,$73,$CF,$33,$A1,$17,$94,$19,$A4,$37,$CF
; Adjustment factors
table0_v4_adjust:
.byte $40,$e6,$9c,$66,$40,$2c,$20,$30,$48,$6c,$1c,$5a
table2_v4_adjust:
.byte $20,$a8,$40,$f8,$bc,$90,$78,$70,$74,$08,$2a,$50
table3_v4_adjust:
.byte $B4,$40,$e6,$9c,$66,$40,$2c,$20,$30,$48,$6c,$1c
; Table #1 of Pro Tracker 3.3x - 3.5x
;PT3NoteTable_ST_high:
;.byte $0E,$0E,$0D,$0C,$0B,$0B,$0A,$09
;.byte $09,$08,$08,$07,$07,$07,$06,$06
;.byte $05,$05,$05,$04,$04,$04,$04,$03
;.byte $03,$03,$03,$03,$02,$02,$02,$02
;.byte $02,$02,$02,$01,$01,$01,$01,$01
;.byte $01,$01,$01,$01,$01,$01,$01,$00
;.byte $00,$00,$00,$00,$00,$00,$00,$00
;.byte $00,$00,$00,$00,$00,$00,$00,$00
;.byte $00,$00,$00,$00,$00,$00,$00,$00
;.byte $00,$00,$00,$00,$00,$00,$00,$00
;.byte $00,$00,$00,$00,$00,$00,$00,$00
;.byte $00,$00,$00,$00,$00,$00,$00,$00
;PT3NoteTable_ST_low:
;.byte $F8,$10,$60,$80,$D8,$28,$88,$F0
;.byte $60,$E0,$58,$E0,$7C,$08,$B0,$40
;.byte $EC,$94,$44,$F8,$B0,$70,$2C,$FD
;.byte $BE,$84,$58,$20,$F6,$CA,$A2,$7C
;.byte $58,$38,$16,$F8,$DF,$C2,$AC,$90
;.byte $7B,$65,$51,$3E,$2C,$1C,$0A,$FC
;.byte $EF,$E1,$D6,$C8,$BD,$B2,$A8,$9F
;.byte $96,$8E,$85,$7E,$77,$70,$6B,$64
;.byte $5E,$59,$54,$4F,$4B,$47,$42,$3F
;.byte $3B,$38,$35,$32,$2F,$2C,$2A,$27
;.byte $25,$23,$21,$1F,$1D,$1C,$1A,$19
;.byte $17,$16,$15,$13,$12,$11,$10,$0F
; Table #2 of Pro Tracker 3.4x - 3.5x
;PT3NoteTable_ASM_34_35_high:
;.byte $0D,$0C,$0B,$0A,$0A,$09,$09,$08
;.byte $08,$07,$07,$06,$06,$06,$05,$05
;.byte $05,$04,$04,$04,$04,$03,$03,$03
;.byte $03,$03,$02,$02,$02,$02,$02,$02
;.byte $02,$01,$01,$01,$01,$01,$01,$01
;.byte $01,$01,$01,$01,$01,$00,$00,$00
;.byte $00,$00,$00,$00,$00,$00,$00,$00
;.byte $00,$00,$00,$00,$00,$00,$00,$00
;.byte $00,$00,$00,$00,$00,$00,$00,$00
;.byte $00,$00,$00,$00,$00,$00,$00,$00
;.byte $00,$00,$00,$00,$00,$00,$00,$00
;.byte $00,$00,$00,$00,$00,$00,$00,$00
;PT3NoteTable_ASM_34_35_low:
;.byte $10,$55,$A4,$FC,$5F,$CA,$3D,$B8
;.byte $3B,$C5,$55,$EC,$88,$2A,$D2,$7E
;.byte $2F,$E5,$9E,$5C,$1D,$E2,$AB,$76
;.byte $44,$15,$E9,$BF,$98,$72,$4F,$2E
;.byte $0F,$F1,$D5,$BB,$A2,$8B,$74,$60
;.byte $4C,$39,$28,$17,$07,$F9,$EB,$DD
;.byte $D1,$C5,$BA,$B0,$A6,$9D,$94,$8C
;.byte $84,$7C,$75,$6F,$69,$63,$5D,$58
;.byte $53,$4E,$4A,$46,$42,$3E,$3B,$37
;.byte $34,$31,$2F,$2C,$29,$27,$25,$23
;.byte $21,$1F,$1D,$1C,$1A,$19,$17,$16
;.byte $15,$14,$12,$11,$10,$0F,$0E,$0D
;PT3VolumeTable_33_34:
;.byte $0,$0,$0,$0,$0,$0,$0,$0,$0,$0,$0,$0,$0,$0,$0,$0
;.byte $0,$0,$0,$0,$0,$0,$0,$0,$1,$1,$1,$1,$1,$1,$1,$1
;.byte $0,$0,$0,$0,$0,$0,$1,$1,$1,$1,$1,$2,$2,$2,$2,$2
;.byte $0,$0,$0,$0,$1,$1,$1,$1,$2,$2,$2,$2,$3,$3,$3,$3
;.byte $0,$0,$0,$0,$1,$1,$1,$2,$2,$2,$3,$3,$3,$4,$4,$4
;.byte $0,$0,$0,$1,$1,$1,$2,$2,$3,$3,$3,$4,$4,$4,$5,$5
;.byte $0,$0,$0,$1,$1,$2,$2,$3,$3,$3,$4,$4,$5,$5,$6,$6
;.byte $0,$0,$1,$1,$2,$2,$3,$3,$4,$4,$5,$5,$6,$6,$7,$7
;.byte $0,$0,$1,$1,$2,$2,$3,$3,$4,$5,$5,$6,$6,$7,$7,$8
;.byte $0,$0,$1,$1,$2,$3,$3,$4,$5,$5,$6,$6,$7,$8,$8,$9
;.byte $0,$0,$1,$2,$2,$3,$4,$4,$5,$6,$6,$7,$8,$8,$9,$A
;.byte $0,$0,$1,$2,$3,$3,$4,$5,$6,$6,$7,$8,$9,$9,$A,$B
;.byte $0,$0,$1,$2,$3,$4,$4,$5,$6,$7,$8,$8,$9,$A,$B,$C
;.byte $0,$0,$1,$2,$3,$4,$5,$6,$7,$7,$8,$9,$A,$B,$C,$D
;.byte $0,$0,$1,$2,$3,$4,$5,$6,$7,$8,$9,$A,$B,$C,$D,$E
;.byte $0,$1,$2,$3,$4,$5,$6,$7,$8,$9,$A,$B,$C,$D,$E,$F
;PT3VolumeTable_35:
;.byte $0,$0,$0,$0,$0,$0,$0,$0,$0,$0,$0,$0,$0,$0,$0,$0
;.byte $0,$0,$0,$0,$0,$0,$0,$0,$1,$1,$1,$1,$1,$1,$1,$1
;.byte $0,$0,$0,$0,$1,$1,$1,$1,$1,$1,$1,$1,$2,$2,$2,$2
;.byte $0,$0,$0,$1,$1,$1,$1,$1,$2,$2,$2,$2,$2,$3,$3,$3
;.byte $0,$0,$1,$1,$1,$1,$2,$2,$2,$2,$3,$3,$3,$3,$4,$4
;.byte $0,$0,$1,$1,$1,$2,$2,$2,$3,$3,$3,$4,$4,$4,$5,$5
;.byte $0,$0,$1,$1,$2,$2,$2,$3,$3,$4,$4,$4,$5,$5,$6,$6
;.byte $0,$0,$1,$1,$2,$2,$3,$3,$4,$4,$5,$5,$6,$6,$7,$7
;.byte $0,$1,$1,$2,$2,$3,$3,$4,$4,$5,$5,$6,$6,$7,$7,$8
;.byte $0,$1,$1,$2,$2,$3,$4,$4,$5,$5,$6,$7,$7,$8,$8,$9
;.byte $0,$1,$1,$2,$3,$3,$4,$5,$5,$6,$7,$7,$8,$9,$9,$A
;.byte $0,$1,$1,$2,$3,$4,$4,$5,$6,$7,$7,$8,$9,$A,$A,$B
;.byte $0,$1,$2,$2,$3,$4,$5,$6,$6,$7,$8,$9,$A,$A,$B,$C
;.byte $0,$1,$2,$3,$3,$4,$5,$6,$7,$8,$9,$A,$A,$B,$C,$D
;.byte $0,$1,$2,$3,$4,$5,$6,$7,$7,$8,$9,$A,$B,$C,$D,$E
;.byte $0,$1,$2,$3,$4,$5,$6,$7,$8,$9,$A,$B,$C,$D,$E,$F
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