dos33fsprogs/vaporlock/rasterbars/pt3_lib_core.s
Vince Weaver e0febd1a90 demos: more work
keep making git mistakes urgh
2021-01-05 22:52:10 -05:00

122 lines
2.9 KiB
ArmAsm

;===========================================================
; Cycle-invariant Library to decode Vortex Tracker PT3 files
; in 6502 assembly for Apple ][ Mockingboard
;
; by Vince Weaver <vince@deater.net>
; Roughly based on the Formats.pas Pascal code from Ay_Emul
; Header offsets
PT3_VERSION = $0D
PT3_HEADER_FREQUENCY = $63
PT3_SPEED = $64
PT3_LOOP = $66
PT3_PATTERN_LOC_L = $67
PT3_PATTERN_LOC_H = $68
PT3_SAMPLE_LOC_L = $69
PT3_SAMPLE_LOC_H = $6A
PT3_ORNAMENT_LOC_L = $A9
PT3_ORNAMENT_LOC_H = $AA
PT3_PATTERN_TABLE = $C9
; Use memset to set things to 0?
NOTE_VOLUME =0
NOTE_TONE_SLIDING_L =1
NOTE_TONE_SLIDING_H =2
NOTE_ENABLED =3
NOTE_ENVELOPE_ENABLED =4
NOTE_SAMPLE_POINTER_L =5
NOTE_SAMPLE_POINTER_H =6
NOTE_SAMPLE_LOOP =7
NOTE_SAMPLE_LENGTH =8
NOTE_TONE_L =9
NOTE_TONE_H =10
NOTE_AMPLITUDE =11
NOTE_NOTE =12
NOTE_LEN =13
NOTE_LEN_COUNT =14
NOTE_ADDR_L =15
NOTE_ADDR_H =16
NOTE_ORNAMENT_POINTER_L =17
NOTE_ORNAMENT_POINTER_H =18
NOTE_ORNAMENT_LOOP =19
NOTE_ORNAMENT_LENGTH =20
NOTE_ONOFF =21
NOTE_TONE_ACCUMULATOR_L =22
NOTE_TONE_ACCUMULATOR_H =23
NOTE_TONE_SLIDE_COUNT =24
NOTE_ORNAMENT_POSITION =25
NOTE_SAMPLE_POSITION =26
NOTE_ENVELOPE_SLIDING =27
NOTE_NOISE_SLIDING =28
NOTE_AMPLITUDE_SLIDING =29
NOTE_ONOFF_DELAY =30 ;ordering of DELAYs is hard-coded now
NOTE_OFFON_DELAY =31 ;ordering of DELAYs is hard-coded now
NOTE_TONE_SLIDE_STEP_L =32
NOTE_TONE_SLIDE_STEP_H =33
NOTE_TONE_SLIDE_DELAY =34
NOTE_SIMPLE_GLISS =35
NOTE_SLIDE_TO_NOTE =36
NOTE_TONE_DELTA_L =37
NOTE_TONE_DELTA_H =38
NOTE_TONE_SLIDE_TO_STEP =39
NOTE_STRUCT_SIZE=40
; always use zero page
note_a = $80
note_b = $80+(NOTE_STRUCT_SIZE*1)
note_c = $80+(NOTE_STRUCT_SIZE*2)
begin_vars=$80
end_vars=$80+(NOTE_STRUCT_SIZE*3)
;========================================================================
;========================================================================
;========================================================================
;========================================================================
;========================================================================
; EVERYTHING IS CYCLE COUNTED
;========================================================================
;========================================================================
;========================================================================
;========================================================================
;========================================================================
.align $100
.include "pt3_lib_sample_ornament.s"
.include "pt3_lib_calculate_note.s"
.include "pt3_lib_decode_note.s"
.include "pt3_lib_set_pattern.s"
.include "pt3_lib_make_frame.s"
.include "pt3_lib_do_frame.s"
;=======================
; tables
;=======================
; aligned to avoid page crossing
.align $100
NoteTable_high:
.res 96,0
NoteTable_low:
.res 96,0
.align $100
VolumeTable:
.res 256,0
pt3_lib_end: