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