mirror of
https://github.com/deater/dos33fsprogs.git
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da2d2dd650
should now detect mockingboard (though still hardcodes slot #4) also at end of ending does cold-reset back to menu
1994 lines
45 KiB
ArmAsm
1994 lines
45 KiB
ArmAsm
;===========================================
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; 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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; Size Optimization -- Mem+Code (pt3_lib_end-note_a)
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; + 3407 bytes -- original working implementation
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; + 3302 bytes -- autogenerate the volume tables
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; + 3297 bytes -- remove some un-needed bytes from struct
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; + 3262 bytes -- combine some duplicated code in $1X/$BX env setting
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; + 3253 bytes -- remove unnecessary variable
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; + 3203 bytes -- combine common code in note decoder
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; + 2937 bytes -- qkumba first pass
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; + 2879 bytes -- qkumba second pass
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; + 2839 bytes -- mask note command in common code
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; + 2832 bytes -- combine $D0 and $E0 decode
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; + 2816 bytes -- eliminate "decode_done" variable (2.75k)
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; + 2817 bytes -- eliminate pt3_version. Slighly faster but also bigger
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; + 2828 bytes -- fix some correctness issues
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; + 2776 bytes -- init vars with loop (slower, but more correct and smaller)
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; + 2739 bytes -- qkumba's crazy SMC everywhere patch
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; + 2418+143 = 2561 bytes -- move NOTE structs to page0
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; + 2423+143 = 2566 bytes -- fix vibrato code
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; + 2554+143 = 2697 bytes -- generate all four tone tables
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; + 2537+143 = 2680 bytes -- inline GetNoteFreq
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; TODO
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; move some of these flags to be bits rather than bytes?
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; enabled could be bit 6 or 7 for fast checking
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; NOTE_ENABLED,ENVELOPE_ENABLED,SIMPLE_GLISS,ENV_SLIDING,AMP_SLIDING?
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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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.ifdef PT3_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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.else ; !PT3_USE_ZERO_PAGE
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begin_vars:
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note_a: ; reset?
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.byte $0 ; NOTE_VOLUME ; 0 ; Y
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.byte $0 ; NOTE_TONE_SLIDING_L ; 1 ; Y
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.byte $0 ; NOTE_TONE_SLIDING_H ; 2 ; Y
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.byte $0 ; NOTE_ENABLED ; 3 ; Y
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.byte $0 ; NOTE_ENVELOPE_ENABLED ; 4 ; Y
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.byte $0 ; NOTE_SAMPLE_POINTER_L ; 5 ; Y
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.byte $0 ; NOTE_SAMPLE_POINTER_H ; 6 ; Y
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.byte $0 ; NOTE_SAMPLE_LOOP ; 7 ; Y
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.byte $0 ; NOTE_SAMPLE_LENGTH ; 8 ; Y
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.byte $0 ; NOTE_TONE_L ; 9
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.byte $0 ; NOTE_TONE_H ; 10
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.byte $0 ; NOTE_AMPLITUDE ; 11
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.byte $0 ; NOTE_NOTE ; 12
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.byte $0 ; NOTE_LEN ; 13
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.byte $0 ; NOTE_LEN_COUNT ; 14
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.byte $0 ; NOTE_ADDR_L ; 15
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.byte $0 ; NOTE_ADDR_H ; 16
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.byte $0 ; NOTE_ORNAMENT_POINTER_L ; 17 ; Y
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.byte $0 ; NOTE_ORNAMENT_POINTER_H ; 18 ; Y
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.byte $0 ; NOTE_ORNAMENT_LOOP ; 19 ; Y
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.byte $0 ; NOTE_ORNAMENT_LENGTH ; 20 ; Y
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.byte $0 ; NOTE_ONOFF ; 21
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.byte $0 ; NOTE_TONE_ACCUMULATOR_L ; 22
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.byte $0 ; NOTE_TONE_ACCUMULATOR_H ; 23
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.byte $0 ; NOTE_TONE_SLIDE_COUNT ; 24
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.byte $0 ; NOTE_ORNAMENT_POSITION ; 25 ; Y
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.byte $0 ; NOTE_SAMPLE_POSITION ; 26 ; Y
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.byte $0 ; NOTE_ENVELOPE_SLIDING ; 27
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.byte $0 ; NOTE_NOISE_SLIDING ; 28
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.byte $0 ; NOTE_AMPLITUDE_SLIDING ; 29
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.byte $0 ; NOTE_ONOFF_DELAY ; 30
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.byte $0 ; NOTE_OFFON_DELAY ; 31
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.byte $0 ; NOTE_TONE_SLIDE_STEP_L ; 32
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.byte $0 ; NOTE_TONE_SLIDE_STEP_H ; 33
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.byte $0 ; NOTE_TONE_SLIDE_DELAY ; 34
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.byte $0 ; NOTE_SIMPLE_GLISS ; 35
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.byte $0 ; NOTE_SLIDE_TO_NOTE ; 36
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.byte $0 ; NOTE_TONE_DELTA_L ; 37
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.byte $0 ; NOTE_TONE_DELTA_H ; 38
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.byte $0 ; NOTE_TONE_SLIDE_TO_STEP ; 39
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note_b:
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.byte $0 ; NOTE_VOLUME
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.byte $0 ; NOTE_TONE_SLIDING_L
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.byte $0 ; NOTE_TONE_SLIDING_H
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.byte $0 ; NOTE_ENABLED
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.byte $0 ; NOTE_ENVELOPE_ENABLED
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.byte $0 ; NOTE_SAMPLE_POINTER_L
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.byte $0 ; NOTE_SAMPLE_POINTER_H
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.byte $0 ; NOTE_SAMPLE_LOOP
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.byte $0 ; NOTE_SAMPLE_LENGTH
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.byte $0 ; NOTE_TONE_L
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.byte $0 ; NOTE_TONE_H
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.byte $0 ; NOTE_AMPLITUDE
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.byte $0 ; NOTE_NOTE
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.byte $0 ; NOTE_LEN
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.byte $0 ; NOTE_LEN_COUNT
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.byte $0 ; NOTE_ADDR_L
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.byte $0 ; NOTE_ADDR_H
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.byte $0 ; NOTE_ORNAMENT_POINTER_L
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.byte $0 ; NOTE_ORNAMENT_POINTER_H
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.byte $0 ; NOTE_ORNAMENT_LOOP
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.byte $0 ; NOTE_ORNAMENT_LENGTH
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.byte $0 ; NOTE_ONOFF
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.byte $0 ; NOTE_TONE_ACCUMULATOR_L
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.byte $0 ; NOTE_TONE_ACCUMULATOR_H
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.byte $0 ; NOTE_TONE_SLIDE_COUNT
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.byte $0 ; NOTE_ORNAMENT_POSITION
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.byte $0 ; NOTE_SAMPLE_POSITION
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.byte $0 ; NOTE_ENVELOPE_SLIDING
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.byte $0 ; NOTE_NOISE_SLIDING
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.byte $0 ; NOTE_AMPLITUDE_SLIDING
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.byte $0 ; NOTE_ONOFF_DELAY
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.byte $0 ; NOTE_OFFON_DELAY
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.byte $0 ; NOTE_TONE_SLIDE_STEP_L
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.byte $0 ; NOTE_TONE_SLIDE_STEP_H
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.byte $0 ; NOTE_TONE_SLIDE_DELAY
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.byte $0 ; NOTE_SIMPLE_GLISS
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.byte $0 ; NOTE_SLIDE_TO_NOTE
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.byte $0 ; NOTE_TONE_DELTA_L
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.byte $0 ; NOTE_TONE_DELTA_H
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.byte $0 ; NOTE_TONE_SLIDE_TO_STEP
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note_c:
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.byte $0 ; NOTE_VOLUME
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.byte $0 ; NOTE_TONE_SLIDING_L
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.byte $0 ; NOTE_TONE_SLIDING_H
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.byte $0 ; NOTE_ENABLED
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.byte $0 ; NOTE_ENVELOPE_ENABLED
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.byte $0 ; NOTE_SAMPLE_POINTER_L
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.byte $0 ; NOTE_SAMPLE_POINTER_H
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.byte $0 ; NOTE_SAMPLE_LOOP
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.byte $0 ; NOTE_SAMPLE_LENGTH
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.byte $0 ; NOTE_TONE_L
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.byte $0 ; NOTE_TONE_H
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.byte $0 ; NOTE_AMPLITUDE
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.byte $0 ; NOTE_NOTE
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.byte $0 ; NOTE_LEN
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.byte $0 ; NOTE_LEN_COUNT
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.byte $0 ; NOTE_ADDR_L
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.byte $0 ; NOTE_ADDR_H
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.byte $0 ; NOTE_ORNAMENT_POINTER_L
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.byte $0 ; NOTE_ORNAMENT_POINTER_H
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.byte $0 ; NOTE_ORNAMENT_LOOP
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.byte $0 ; NOTE_ORNAMENT_LENGTH
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.byte $0 ; NOTE_ONOFF
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.byte $0 ; NOTE_TONE_ACCUMULATOR_L
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.byte $0 ; NOTE_TONE_ACCUMULATOR_H
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.byte $0 ; NOTE_TONE_SLIDE_COUNT
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.byte $0 ; NOTE_ORNAMENT_POSITION
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.byte $0 ; NOTE_SAMPLE_POSITION
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.byte $0 ; NOTE_ENVELOPE_SLIDING
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.byte $0 ; NOTE_NOISE_SLIDING
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.byte $0 ; NOTE_AMPLITUDE_SLIDING
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.byte $0 ; NOTE_ONOFF_DELAY
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.byte $0 ; NOTE_OFFON_DELAY
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.byte $0 ; NOTE_TONE_SLIDE_STEP_L
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.byte $0 ; NOTE_TONE_SLIDE_STEP_H
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.byte $0 ; NOTE_TONE_SLIDE_DELAY
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.byte $0 ; NOTE_SIMPLE_GLISS
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.byte $0 ; NOTE_SLIDE_TO_NOTE
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.byte $0 ; NOTE_TONE_DELTA_L
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.byte $0 ; NOTE_TONE_DELTA_H
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.byte $0 ; NOTE_TONE_SLIDE_TO_STEP
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end_vars:
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.endif
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load_ornament0_sample1:
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lda #0 ; 2
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jsr load_ornament ; 6
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; fall through
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;===========================
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; Load Sample
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;===========================
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; sample in A
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; which note offset in X
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; Sample table pointers are 16-bits little endian
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; There are 32 of these pointers starting at $6a:$69
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; Our sample starts at address (A*2)+that pointer
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; We point SAMPLE_H:SAMPLE_L to this
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; then we load the length/data values
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; and then leave SAMPLE_H:SAMPLE_L pointing to begnning of
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; the sample data
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; Optimization:
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; see comments on ornament setting
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load_sample1:
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lda #1 ; 2
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load_sample:
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sty PT3_TEMP ; 3
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;pt3->ornament_patterns[i]=
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; (pt3->data[0x6a+(i*2)]<<8)|pt3->data[0x69+(i*2)];
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asl ; A*2 ; 2
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tay ; 2
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; Set the initial sample pointer
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; a->sample_pointer=pt3->sample_patterns[a->sample];
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lda PT3_LOC+PT3_SAMPLE_LOC_L,Y ; 4+
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sta SAMPLE_L ; 3
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lda PT3_LOC+PT3_SAMPLE_LOC_L+1,Y ; 4+
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; assume pt3 file is at page boundary
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adc #>PT3_LOC ; 2
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sta SAMPLE_H ; 3
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; Set the loop value
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; a->sample_loop=pt3->data[a->sample_pointer];
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ldy #0 ; 2
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lda (SAMPLE_L),Y ; 5+
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sta note_a+NOTE_SAMPLE_LOOP,X ; 5
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; Set the length value
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; a->sample_length=pt3->data[a->sample_pointer];
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iny ; 2
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lda (SAMPLE_L),Y ; 5+
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sta note_a+NOTE_SAMPLE_LENGTH,X ; 5
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; Set pointer to beginning of samples
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lda SAMPLE_L ; 3
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adc #$2 ; 2
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sta note_a+NOTE_SAMPLE_POINTER_L,X ; 5
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lda SAMPLE_H ; 3
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adc #$0 ; 2
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sta note_a+NOTE_SAMPLE_POINTER_H,X ; 5
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ldy PT3_TEMP ; 3
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rts ; 6
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;============
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; 76
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;===========================
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; Load Ornament
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;===========================
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; ornament value in A
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; note offset in X
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; Ornament table pointers are 16-bits little endian
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; There are 16 of these pointers starting at $aa:$a9
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; Our ornament starts at address (A*2)+that pointer
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; We point ORNAMENT_H:ORNAMENT_L to this
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; then we load the length/data values
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; and then leave ORNAMENT_H:ORNAMENT_L pointing to begnning of
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; the ornament data
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; Optimization:
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; Loop and length only used once, can be located negative
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; from the pointer, but 6502 doesn't make addressing like that
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; easy. Can't self modify as channels A/B/C have own copies
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; of the var.
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load_ornament:
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sty PT3_TEMP ; save Y value ; 3
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;pt3->ornament_patterns[i]=
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; (pt3->data[0xaa+(i*2)]<<8)|pt3->data[0xa9+(i*2)];
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asl ; A*2 ; 2
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tay ; 2
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; a->ornament_pointer=pt3->ornament_patterns[a->ornament];
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lda PT3_LOC+PT3_ORNAMENT_LOC_L,Y ; 4+
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sta ORNAMENT_L ; 3
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lda PT3_LOC+PT3_ORNAMENT_LOC_L+1,Y ; 4+
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; we're assuming PT3 is loaded to a page boundary
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adc #>PT3_LOC ; 2
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sta ORNAMENT_H ; 3
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lda #0 ; 2
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sta note_a+NOTE_ORNAMENT_POSITION,X ; 5
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tay ; 2
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; Set the loop value
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; a->ornament_loop=pt3->data[a->ornament_pointer];
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lda (ORNAMENT_L),Y ; 5+
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sta note_a+NOTE_ORNAMENT_LOOP,X ; 5
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; Set the length value
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; a->ornament_length=pt3->data[a->ornament_pointer];
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iny ; 2
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lda (ORNAMENT_L),Y ; 5+
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sta note_a+NOTE_ORNAMENT_LENGTH,X ; 5
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; Set the pointer to the value past the length
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lda ORNAMENT_L ; 3
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adc #$2 ; 2
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sta note_a+NOTE_ORNAMENT_POINTER_L,X ; 5
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lda ORNAMENT_H ; 3
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adc #$0 ; 2
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sta note_a+NOTE_ORNAMENT_POINTER_H,X ; 5
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ldy PT3_TEMP ; restore Y value ; 3
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rts ; 6
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;============
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; 83
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;=====================================
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; Calculate Note
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;=====================================
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; note offset in X
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calculate_note:
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lda note_a+NOTE_ENABLED,X ; 4+
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bne note_enabled ; 2/3
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sta note_a+NOTE_AMPLITUDE,X ; 5
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jmp done_note ; 3
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note_enabled:
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lda note_a+NOTE_SAMPLE_POINTER_H,X ; 4+
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sta SAMPLE_H ; 3
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lda note_a+NOTE_SAMPLE_POINTER_L,X ; 4+
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sta SAMPLE_L ; 3
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lda note_a+NOTE_ORNAMENT_POINTER_H,X ; 4+
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sta ORNAMENT_H ; 3
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lda note_a+NOTE_ORNAMENT_POINTER_L,X ; 4+
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sta ORNAMENT_L ; 3
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lda note_a+NOTE_SAMPLE_POSITION,X ; 4+
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asl ; 2
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asl ; 2
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tay ; 2
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; b0 = pt3->data[a->sample_pointer + a->sample_position * 4];
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lda (SAMPLE_L),Y ; 5+
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sta sample_b0_smc+1 ; 4
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; b1 = pt3->data[a->sample_pointer + a->sample_position * 4 + 1];
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iny ; 2
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lda (SAMPLE_L),Y ; 5+
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sta sample_b1_smc+1 ; 4
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; a->tone = pt3->data[a->sample_pointer + a->sample_position*4+2];
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; a->tone+=(pt3->data[a->sample_pointer + a->sample_position*4+3])<<8;
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; a->tone += a->tone_accumulator;
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iny ; 2
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lda (SAMPLE_L),Y ; 5+
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adc note_a+NOTE_TONE_ACCUMULATOR_L,X ; 4+
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sta note_a+NOTE_TONE_L,X ; 4
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iny ; 2
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lda (SAMPLE_L),Y ; 5+
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adc note_a+NOTE_TONE_ACCUMULATOR_H,X ; 4+
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sta note_a+NOTE_TONE_H,X ; 4
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;=============================
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; Accumulate tone if set
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; (if sample_b1 & $40)
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bit sample_b1_smc+1
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bvc no_accum ; (so, if b1&0x40 is zero, skip it)
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sta note_a+NOTE_TONE_ACCUMULATOR_H,X
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lda note_a+NOTE_TONE_L,X ; tone_accumulator=tone
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sta note_a+NOTE_TONE_ACCUMULATOR_L,X
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no_accum:
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;============================
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; Calculate tone
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; j = a->note + (pt3->data[a->ornament_pointer + a->ornament_position]
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clc ;;can be removed if ADC ACCUMULATOR_H cannot overflow
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ldy note_a+NOTE_ORNAMENT_POSITION,X
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lda (ORNAMENT_L),Y
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adc note_a+NOTE_NOTE,X
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; if (j < 0) j = 0;
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bpl note_not_negative
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lda #0
|
|
|
|
; if (j > 95) j = 95;
|
|
note_not_negative:
|
|
cmp #96
|
|
bcc note_not_too_high ; blt
|
|
|
|
lda #95
|
|
|
|
note_not_too_high:
|
|
|
|
; w = GetNoteFreq(j,pt3->frequency_table);
|
|
|
|
tay ; for GetNoteFreq later
|
|
|
|
; a->tone = (a->tone + a->tone_sliding + w) & 0xfff;
|
|
|
|
clc
|
|
lda note_a+NOTE_TONE_SLIDING_L,X
|
|
adc note_a+NOTE_TONE_L,X
|
|
sta temp_word_l1_smc+1
|
|
|
|
lda note_a+NOTE_TONE_H,X
|
|
adc note_a+NOTE_TONE_SLIDING_H,X
|
|
sta temp_word_h1_smc+1
|
|
|
|
clc ;;can be removed if ADC SLIDING_H cannot overflow
|
|
temp_word_l1_smc:
|
|
lda #$d1
|
|
adc NoteTable_low,Y ; GetNoteFreq
|
|
sta note_a+NOTE_TONE_L,X
|
|
temp_word_h1_smc:
|
|
lda #$d1
|
|
adc NoteTable_high,Y ; GetNoteFreq
|
|
and #$0f
|
|
sta note_a+NOTE_TONE_H,X
|
|
|
|
;=====================
|
|
; handle tone sliding
|
|
|
|
lda note_a+NOTE_TONE_SLIDE_COUNT,X
|
|
bmi no_tone_sliding ; if (a->tone_slide_count > 0) {
|
|
beq no_tone_sliding
|
|
|
|
dec note_a+NOTE_TONE_SLIDE_COUNT,X ; a->tone_slide_count--;
|
|
bne no_tone_sliding ; if (a->tone_slide_count==0) {
|
|
|
|
|
|
; a->tone_sliding+=a->tone_slide_step
|
|
clc ;;can be removed if ADC freq_h cannot overflow
|
|
lda note_a+NOTE_TONE_SLIDING_L,X
|
|
adc note_a+NOTE_TONE_SLIDE_STEP_L,X
|
|
sta note_a+NOTE_TONE_SLIDING_L,X
|
|
tay ; save NOTE_TONE_SLIDING_L in y
|
|
lda note_a+NOTE_TONE_SLIDING_H,X
|
|
adc note_a+NOTE_TONE_SLIDE_STEP_H,X
|
|
sta note_a+NOTE_TONE_SLIDING_H,X
|
|
|
|
; a->tone_slide_count = a->tone_slide_delay;
|
|
lda note_a+NOTE_TONE_SLIDE_DELAY,X
|
|
sta note_a+NOTE_TONE_SLIDE_COUNT,X
|
|
|
|
lda note_a+NOTE_SIMPLE_GLISS,X
|
|
bne no_tone_sliding ; if (!a->simplegliss) {
|
|
|
|
; FIXME: do these need to be signed compares?
|
|
|
|
check1:
|
|
lda note_a+NOTE_TONE_SLIDE_STEP_H,X
|
|
bpl check2 ; if ( ((a->tone_slide_step < 0) &&
|
|
|
|
; (a->tone_sliding <= a->tone_delta) ||
|
|
|
|
; 16 bit signed compare
|
|
tya ; y has NOTE_TONE_SLIDING_L
|
|
cmp note_a+NOTE_TONE_DELTA_L,X ; NUM1-NUM2
|
|
lda note_a+NOTE_TONE_SLIDING_H,X
|
|
sbc note_a+NOTE_TONE_DELTA_H,X
|
|
bvc sc_loser1 ; N eor V
|
|
eor #$80
|
|
sc_loser1:
|
|
bmi slide_to_note ; then A (signed) < NUM (signed) and BMI will branch
|
|
|
|
; equals case
|
|
tya ; y has NOTE_TONE_SLIDING_L
|
|
cmp note_a+NOTE_TONE_DELTA_L,X
|
|
bne check2
|
|
lda note_a+NOTE_TONE_SLIDING_H,X
|
|
cmp note_a+NOTE_TONE_DELTA_H,X
|
|
beq slide_to_note
|
|
|
|
check2:
|
|
lda note_a+NOTE_TONE_SLIDE_STEP_H,X
|
|
bmi no_tone_sliding ; ((a->tone_slide_step >= 0) &&
|
|
|
|
; (a->tone_sliding >= a->tone_delta)
|
|
|
|
; 16 bit signed compare
|
|
tya ; y has NOTE_TONE_SLIDING_L
|
|
cmp note_a+NOTE_TONE_DELTA_L,X ; num1-num2
|
|
lda note_a+NOTE_TONE_SLIDING_H,X
|
|
sbc note_a+NOTE_TONE_DELTA_H,X
|
|
bvc sc_loser2 ; N eor V
|
|
eor #$80
|
|
sc_loser2:
|
|
bmi no_tone_sliding ; then A (signed) < NUM (signed) and BMI will branch
|
|
|
|
slide_to_note:
|
|
; a->note = a->slide_to_note;
|
|
lda note_a+NOTE_SLIDE_TO_NOTE,X
|
|
sta note_a+NOTE_NOTE,X
|
|
lda #0
|
|
sta note_a+NOTE_TONE_SLIDE_COUNT,X
|
|
sta note_a+NOTE_TONE_SLIDING_L,X
|
|
sta note_a+NOTE_TONE_SLIDING_H,X
|
|
|
|
|
|
no_tone_sliding:
|
|
|
|
;=========================
|
|
; Calculate the amplitude
|
|
;=========================
|
|
calc_amplitude:
|
|
; get base value from the sample (bottom 4 bits of sample_b1)
|
|
|
|
sample_b1_smc:
|
|
lda #$d1 ; a->amplitude= (b1 & 0xf);
|
|
and #$f
|
|
|
|
;========================================
|
|
; if b0 top bit is set, it means sliding
|
|
|
|
; adjust amplitude sliding
|
|
|
|
bit sample_b0_smc+1 ; if ((b0 & 0x80)!=0) {
|
|
bpl done_amp_sliding ; so if top bit not set, skip
|
|
tay
|
|
|
|
;================================
|
|
; if top bits 0b11 then slide up
|
|
; if top bits 0b10 then slide down
|
|
|
|
; if ((b0 & 0x40)!=0) {
|
|
lda note_a+NOTE_AMPLITUDE_SLIDING,X
|
|
sec
|
|
bvc amp_slide_down
|
|
|
|
amp_slide_up:
|
|
; if (a->amplitude_sliding < 15) {
|
|
; a pain to do signed compares
|
|
sbc #15
|
|
bvc asu_signed
|
|
eor #$80
|
|
asu_signed:
|
|
bpl done_amp_sliding ; skip if A>=15
|
|
inc note_a+NOTE_AMPLITUDE_SLIDING,X ; a->amplitude_sliding++;
|
|
bne done_amp_sliding_y
|
|
|
|
amp_slide_down:
|
|
; if (a->amplitude_sliding > -15) {
|
|
; a pain to do signed compares
|
|
sbc #$f1 ; -15
|
|
bvc asd_signed
|
|
eor #$80
|
|
asd_signed:
|
|
bmi done_amp_sliding ; if A < -15, skip subtract
|
|
|
|
dec note_a+NOTE_AMPLITUDE_SLIDING,X ; a->amplitude_sliding--;
|
|
|
|
done_amp_sliding_y:
|
|
tya
|
|
|
|
done_amp_sliding:
|
|
|
|
; a->amplitude+=a->amplitude_sliding;
|
|
clc
|
|
adc note_a+NOTE_AMPLITUDE_SLIDING,X
|
|
|
|
; clamp amplitude to 0 - 15
|
|
|
|
check_amp_lo:
|
|
bmi write_clamp_amplitude
|
|
|
|
check_amp_hi:
|
|
cmp #16
|
|
bcc write_amplitude ; blt
|
|
lda #15
|
|
.byte $2C
|
|
write_clamp_amplitude:
|
|
lda #0
|
|
write_amplitude:
|
|
sta note_amp_smc+1
|
|
|
|
done_clamp_amplitude:
|
|
|
|
; We generate the proper table at runtime now
|
|
; so always in Volume Table
|
|
; a->amplitude = PT3VolumeTable_33_34[a->volume][a->amplitude];
|
|
; a->amplitude = PT3VolumeTable_35[a->volume][a->amplitude];
|
|
|
|
lda note_a+NOTE_VOLUME,X ; 4+
|
|
asl ; 2
|
|
asl ; 2
|
|
asl ; 2
|
|
asl ; 2
|
|
note_amp_smc:
|
|
ora #$d1 ; 4+
|
|
|
|
tay ; 2
|
|
lda VolumeTable,Y ; 4+
|
|
sta note_a+NOTE_AMPLITUDE,X ; 5
|
|
|
|
done_table:
|
|
|
|
|
|
check_envelope_enable:
|
|
; Bottom bit of b0 indicates our sample has envelope
|
|
; Also make sure envelopes are enabled
|
|
|
|
|
|
; if (((b0 & 0x1) == 0) && ( a->envelope_enabled)) {
|
|
sample_b0_smc:
|
|
lda #$d1
|
|
lsr
|
|
tay
|
|
bcs envelope_slide
|
|
|
|
lda note_a+NOTE_ENVELOPE_ENABLED,X
|
|
beq envelope_slide
|
|
|
|
|
|
; Bit 4 of the per-channel AY-3-8910 amplitude specifies
|
|
; envelope enabled
|
|
|
|
lda note_a+NOTE_AMPLITUDE,X ; a->amplitude |= 16;
|
|
ora #$10
|
|
sta note_a+NOTE_AMPLITUDE,X
|
|
|
|
|
|
envelope_slide:
|
|
|
|
; Envelope slide
|
|
; If b1 top bits are 10 or 11
|
|
|
|
lda sample_b0_smc+1
|
|
asl
|
|
asl
|
|
asl ; b0 bit 5 to carry flag
|
|
lda #$20
|
|
bit sample_b1_smc+1 ; b1 bit 7 to sign flag, bit 5 to zero flag
|
|
php
|
|
bpl else_noise_slide ; if ((b1 & 0x80) != 0) {
|
|
tya
|
|
ora #$f0
|
|
bcs envelope_slide_down ; if ((b0 & 0x20) == 0) {
|
|
|
|
envelope_slide_up:
|
|
; j = ((b0>>1)&0xF) + a->envelope_sliding;
|
|
and #$0f
|
|
clc
|
|
|
|
envelope_slide_down:
|
|
|
|
; j = ((b0>>1)|0xF0) + a->envelope_sliding
|
|
adc note_a+NOTE_ENVELOPE_SLIDING,X
|
|
sta e_slide_amount_smc+1 ; j
|
|
|
|
envelope_slide_done:
|
|
|
|
plp
|
|
beq last_envelope ; if (( b1 & 0x20) != 0) {
|
|
|
|
; a->envelope_sliding = j;
|
|
sta note_a+NOTE_ENVELOPE_SLIDING,X
|
|
|
|
last_envelope:
|
|
|
|
; pt3->envelope_add+=j;
|
|
|
|
clc
|
|
e_slide_amount_smc:
|
|
lda #$d1
|
|
adc pt3_envelope_add_smc+1
|
|
sta pt3_envelope_add_smc+1
|
|
|
|
jmp noise_slide_done ; skip else
|
|
|
|
else_noise_slide:
|
|
; Noise slide
|
|
; else {
|
|
|
|
; pt3->noise_add = (b0>>1) + a->noise_sliding;
|
|
tya
|
|
clc
|
|
adc note_a+NOTE_NOISE_SLIDING,X
|
|
sta pt3_noise_add_smc+1
|
|
|
|
plp
|
|
beq noise_slide_done ; if ((b1 & 0x20) != 0) {
|
|
|
|
; noise_sliding = pt3_noise_add
|
|
sta note_a+NOTE_NOISE_SLIDING,X
|
|
|
|
noise_slide_done:
|
|
;======================
|
|
; set mixer
|
|
|
|
lda sample_b1_smc+1 ; pt3->mixer_value = ((b1 >>1) & 0x48) | pt3->mixer_value;
|
|
lsr
|
|
and #$48
|
|
|
|
ora PT3_MIXER_VAL ; 3
|
|
sta PT3_MIXER_VAL ; 3
|
|
|
|
|
|
;========================
|
|
; increment sample position
|
|
|
|
inc note_a+NOTE_SAMPLE_POSITION,X ; a->sample_position++;
|
|
|
|
lda note_a+NOTE_SAMPLE_POSITION,X
|
|
cmp note_a+NOTE_SAMPLE_LENGTH,X
|
|
|
|
bcc sample_pos_ok ; blt
|
|
|
|
lda note_a+NOTE_SAMPLE_LOOP,X
|
|
sta note_a+NOTE_SAMPLE_POSITION,X
|
|
|
|
sample_pos_ok:
|
|
|
|
;========================
|
|
; increment ornament position
|
|
|
|
inc note_a+NOTE_ORNAMENT_POSITION,X ; a->ornament_position++;
|
|
lda note_a+NOTE_ORNAMENT_POSITION,X
|
|
cmp note_a+NOTE_ORNAMENT_LENGTH,X
|
|
|
|
bcc ornament_pos_ok ; blt
|
|
|
|
lda note_a+NOTE_ORNAMENT_LOOP,X
|
|
sta note_a+NOTE_ORNAMENT_POSITION,X
|
|
ornament_pos_ok:
|
|
|
|
|
|
done_note:
|
|
; set mixer value
|
|
; this is a bit complex (from original code)
|
|
; after 3 calls it is set up properly
|
|
lsr PT3_MIXER_VAL
|
|
|
|
handle_onoff:
|
|
ldy note_a+NOTE_ONOFF,X ;if (a->onoff>0) {
|
|
beq done_onoff
|
|
|
|
dey ; a->onoff--;
|
|
|
|
bne put_offon ; if (a->onoff==0) {
|
|
lda note_a+NOTE_ENABLED,X
|
|
eor #$1 ; toggle note_enabled
|
|
sta note_a+NOTE_ENABLED,X
|
|
|
|
beq do_offon
|
|
do_onoff:
|
|
ldy note_a+NOTE_ONOFF_DELAY,X ; if (a->enabled) a->onoff=a->onoff_delay;
|
|
jmp put_offon
|
|
do_offon:
|
|
ldy note_a+NOTE_OFFON_DELAY,X ; else a->onoff=a->offon_delay;
|
|
put_offon:
|
|
.ifdef PT3_USE_ZERO_PAGE
|
|
sty note_a+NOTE_ONOFF,X
|
|
.else
|
|
lda note_a+NOTE_ONOFF,X
|
|
tay
|
|
.endif
|
|
|
|
done_onoff:
|
|
|
|
rts ; 6
|
|
|
|
|
|
|
|
|
|
|
|
|
|
;=====================================
|
|
; Decode Note
|
|
;=====================================
|
|
; X points to the note offset
|
|
|
|
; Note! These timings are out of date (FIXME)
|
|
; Timings (from ===>)
|
|
; 00: 14+30
|
|
; 0X: 14+15
|
|
; 10: 14+5 +124
|
|
; 1X: 14+5 +193
|
|
; 2X/3X: 14+5 +17
|
|
; 4X: 14+5+5 + 111
|
|
; 5X-BX: 14+5+5+ 102
|
|
; CX:
|
|
; DX/EX:
|
|
; FX:
|
|
|
|
stop_decoding:
|
|
|
|
; we are still running, decrement and early return
|
|
dec note_a+NOTE_LEN_COUNT,X ; 7
|
|
rts ; 6
|
|
|
|
;=====================================
|
|
; Decode Line
|
|
;=====================================
|
|
|
|
pt3_decode_line:
|
|
; decode_note(&pt3->a,&(pt3->a_addr),pt3);
|
|
ldx #(NOTE_STRUCT_SIZE*0)
|
|
jsr decode_note
|
|
|
|
; decode_note(&pt3->b,&(pt3->b_addr),pt3);
|
|
ldx #(NOTE_STRUCT_SIZE*1)
|
|
jsr decode_note
|
|
|
|
; decode_note(&pt3->c,&(pt3->c_addr),pt3);
|
|
ldx #(NOTE_STRUCT_SIZE*2)
|
|
;;jsr decode_note ; fall through
|
|
|
|
; if (pt3->a.all_done && pt3->b.all_done && pt3->c.all_done) {
|
|
; return 1;
|
|
; }
|
|
|
|
decode_note:
|
|
|
|
; Init vars
|
|
|
|
ldy #0 ; 2
|
|
sty spec_command_smc+1 ; 4
|
|
|
|
; Skip decode if note still running
|
|
lda note_a+NOTE_LEN_COUNT,X ; 4+
|
|
cmp #2 ; 2
|
|
bcs stop_decoding ; blt, assume not negative ; 2/3
|
|
|
|
keep_decoding:
|
|
|
|
lda note_a+NOTE_NOTE,X ; store prev note ; 4+
|
|
sta prev_note_smc+1 ; 4
|
|
|
|
lda note_a+NOTE_TONE_SLIDING_H,X ; store prev sliding ; 4+
|
|
sta prev_sliding_h_smc+1 ; 4
|
|
lda note_a+NOTE_TONE_SLIDING_L,X ; 4+
|
|
sta prev_sliding_l_smc+1 ; 4
|
|
|
|
|
|
;============
|
|
; 24
|
|
|
|
note_decode_loop:
|
|
lda note_a+NOTE_LEN,X ; re-up length count ; 4+
|
|
sta note_a+NOTE_LEN_COUNT,X ; 5
|
|
|
|
lda note_a+NOTE_ADDR_L,X ; 4+
|
|
sta PATTERN_L ; 3
|
|
lda note_a+NOTE_ADDR_H,X ; 4+
|
|
sta PATTERN_H ; 3
|
|
;===>
|
|
; get next value
|
|
lda (PATTERN_L),Y ; 5+
|
|
sta note_command_smc+1 ; save termporarily ; 4
|
|
and #$0f ; 2
|
|
sta note_command_bottom_smc+1 ; 4
|
|
|
|
note_command_smc:
|
|
lda #$d1 ; 2
|
|
|
|
; FIXME: use a jump table??
|
|
; further reflection, that would require 32-bytes of addresses
|
|
; in addition to needing X or Y to index the jump table. hmmm
|
|
|
|
and #$f0 ; 2
|
|
|
|
; cmp #$00
|
|
bne decode_case_1X ; 2/3
|
|
;=============
|
|
; 14
|
|
|
|
decode_case_0X:
|
|
;==============================
|
|
; $0X set special effect
|
|
;==============================
|
|
; -1
|
|
note_command_bottom_smc:
|
|
lda #$d1 ; 2
|
|
|
|
; we can always store spec as 0 means no spec
|
|
|
|
; FIXME: what if multiple spec commands?
|
|
; Doesn't seem to happen in practice
|
|
; But AY_emul has code to handle it
|
|
|
|
sta spec_command_smc+1 ; 4
|
|
|
|
bne decode_case_0X_not_zero ; 2/3
|
|
;=============
|
|
; 8
|
|
; 00 case
|
|
; means end of pattern
|
|
; -1
|
|
sta note_a+NOTE_LEN_COUNT,X ; len_count=0; ; 5
|
|
|
|
dec pt3_pattern_done_smc+1 ; 6
|
|
|
|
jmp note_done_decoding ; 3
|
|
|
|
decode_case_1X:
|
|
;==============================
|
|
; $1X -- Set Envelope Type
|
|
;==============================
|
|
|
|
cmp #$10 ; 2
|
|
bne decode_case_2X ; 2/3
|
|
;============
|
|
; 5
|
|
|
|
; -1
|
|
lda note_command_bottom_smc+1 ; 4
|
|
bne decode_case_not_10 ; 3
|
|
|
|
decode_case_10:
|
|
; 10 case - disable ; -1
|
|
sta note_a+NOTE_ENVELOPE_ENABLED,X ; A is 0 ; 5
|
|
beq decode_case_1x_common ; branch always ; 3
|
|
|
|
decode_case_not_10:
|
|
; -1
|
|
jsr set_envelope ; 6+64
|
|
|
|
decode_case_1x_common:
|
|
|
|
iny ; 2
|
|
lda (PATTERN_L),Y ; 5+
|
|
lsr ; 2
|
|
jsr load_sample ; 6+86
|
|
|
|
lda #0 ; 2
|
|
sta note_a+NOTE_ORNAMENT_POSITION,X ; ornament_position=0 ; 5
|
|
|
|
decode_case_0X_not_zero:
|
|
|
|
jmp done_decode_loop ; 3
|
|
|
|
decode_case_2X:
|
|
decode_case_3X:
|
|
;==============================
|
|
; $2X/$3X set noise period
|
|
;==============================
|
|
|
|
cmp #$40 ; 2
|
|
bcs decode_case_4X ; branch greater/equal ; 3
|
|
; -1
|
|
lda note_command_smc+1 ; 4
|
|
adc #$e0 ; same as subtract $20 ; 2
|
|
sta pt3_noise_period_smc+1 ; 3
|
|
|
|
jmp done_decode_loop ; 3
|
|
;===========
|
|
; 16
|
|
|
|
decode_case_4X:
|
|
;==============================
|
|
; $4X -- set ornament
|
|
;==============================
|
|
; cmp #$40 ; already set ;
|
|
bne decode_case_5X ; 3
|
|
; -1
|
|
lda note_command_bottom_smc+1; set ornament to bottom nibble; 4
|
|
jsr load_ornament ; 6+93
|
|
|
|
jmp done_decode_loop ; 3
|
|
;============
|
|
; 110
|
|
|
|
decode_case_5X:
|
|
;==============================
|
|
; $5X-$AX set note
|
|
;==============================
|
|
cmp #$B0 ; 2
|
|
bcs decode_case_bX ; branch greater/equal ; 3
|
|
|
|
; -1
|
|
lda note_command_smc+1 ; 4
|
|
adc #$b0 ; 2
|
|
sta note_a+NOTE_NOTE,X ; note=(current_val-0x50); ; 5
|
|
|
|
jsr reset_note ; 6+69
|
|
|
|
lda #1 ; 2
|
|
sta note_a+NOTE_ENABLED,X ; enabled=1 ; 5
|
|
|
|
|
|
bne note_done_decoding ; 3
|
|
|
|
decode_case_bX:
|
|
;============================================
|
|
; $BX -- note length or envelope manipulation
|
|
;============================================
|
|
; cmp #$b0 ; already set from before
|
|
bne decode_case_cX ; 3
|
|
; -1
|
|
lda note_command_bottom_smc+1 ; 4
|
|
beq decode_case_b0 ; 3
|
|
; -1
|
|
sbc #1 ; envelope_type=(current_val&0xf)-1; ; 2
|
|
bne decode_case_bx_higher ; 3
|
|
|
|
decode_case_b1:
|
|
; Set Length
|
|
|
|
; get next byte
|
|
iny ; 2
|
|
lda (PATTERN_L),Y ; 5
|
|
|
|
sta note_a+NOTE_LEN,X ; 5
|
|
sta note_a+NOTE_LEN_COUNT,X ; 5
|
|
bcs done_decode_loop ; branch always ; 3
|
|
|
|
decode_case_b0:
|
|
; Disable envelope
|
|
sta note_a+NOTE_ENVELOPE_ENABLED,X ; 5
|
|
sta note_a+NOTE_ORNAMENT_POSITION,X ; 5
|
|
beq done_decode_loop ; 3
|
|
|
|
|
|
decode_case_bx_higher:
|
|
|
|
jsr set_envelope ; 6+64
|
|
|
|
bcs done_decode_loop ; branch always ; 3
|
|
|
|
decode_case_cX:
|
|
;==============================
|
|
; $CX -- set volume
|
|
;==============================
|
|
cmp #$c0 ; check top nibble $C ; 2
|
|
bne decode_case_dX ; 3
|
|
; -1
|
|
lda note_command_bottom_smc+1 ; 4
|
|
bne decode_case_cx_not_c0 ; 3
|
|
; -1
|
|
decode_case_c0:
|
|
; special case $C0 means shut down the note
|
|
|
|
sta note_a+NOTE_ENABLED,X ; enabled=0 ; 5
|
|
|
|
jsr reset_note ; 6+69
|
|
|
|
beq note_done_decoding ; branch always ; 3
|
|
|
|
decode_case_cx_not_c0:
|
|
sta note_a+NOTE_VOLUME,X ; volume=current_val&0xf; 5
|
|
bne done_decode_loop ; branch always ; 3
|
|
|
|
decode_case_dX:
|
|
;==============================
|
|
; $DX/$EX -- change sample
|
|
;==============================
|
|
; D0 = special case (end note)
|
|
; D1-EF = set sample to (value - $D0)
|
|
|
|
cmp #$f0 ; check top nibble $D/$E ; 2
|
|
beq decode_case_fX ; 3
|
|
; -1
|
|
|
|
lda note_command_smc+1 ; 4
|
|
sec ; 2
|
|
sbc #$d0 ; 2
|
|
beq note_done_decoding ; 3
|
|
|
|
decode_case_not_d0:
|
|
; -1
|
|
|
|
jsr load_sample ; load sample in bottom nybble ; 6+??
|
|
|
|
bcc done_decode_loop; branch always ; 3
|
|
|
|
;========================
|
|
; d0 case means end note
|
|
;decode_case_d0:
|
|
; jmp note_done_decoding
|
|
|
|
|
|
;==============================
|
|
; $FX - change ornament/sample
|
|
;==============================
|
|
decode_case_fX:
|
|
; disable envelope
|
|
lda #0 ; 2
|
|
sta note_a+NOTE_ENVELOPE_ENABLED,X ; 5
|
|
|
|
; Set ornament to low byte of command
|
|
lda note_command_bottom_smc+1 ; 4
|
|
jsr load_ornament ; ornament to load in A ; 6+?
|
|
|
|
; Get next byte
|
|
iny ; point to next byte ; 2
|
|
lda (PATTERN_L),Y ; 5
|
|
|
|
; Set sample to value/2
|
|
lsr ; divide by two ; 2
|
|
jsr load_sample ; sample to load in A ; 6+?
|
|
|
|
; fallthrough
|
|
|
|
done_decode_loop:
|
|
|
|
iny ; point to next byte ; 2
|
|
|
|
jmp note_decode_loop ; 3
|
|
|
|
note_done_decoding:
|
|
|
|
iny ; point to next byte ; 2
|
|
|
|
;=================================
|
|
; handle effects
|
|
;=================================
|
|
; Note, the AYemul code has code to make sure these are applied
|
|
; In the same order they appear. We don't bother?
|
|
handle_effects:
|
|
|
|
spec_command_smc:
|
|
lda #$d1 ; 2
|
|
|
|
;==============================
|
|
; Effect #1 -- Tone Down
|
|
;==============================
|
|
effect_1:
|
|
cmp #$1 ; 2
|
|
bne effect_2 ; 3
|
|
; -1
|
|
sta note_a+NOTE_SIMPLE_GLISS,X ; 5
|
|
lsr ; 2
|
|
sta note_a+NOTE_ONOFF,X ; 5
|
|
|
|
lda (PATTERN_L),Y ; load byte, set as slide delay ; 5
|
|
iny ; 2
|
|
|
|
sta note_a+NOTE_TONE_SLIDE_DELAY,X ; 5
|
|
sta note_a+NOTE_TONE_SLIDE_COUNT,X ; 5
|
|
|
|
lda (PATTERN_L),Y ; load byte, set as slide step low ; 5
|
|
iny ; 2
|
|
sta note_a+NOTE_TONE_SLIDE_STEP_L,X ; 5
|
|
|
|
lda (PATTERN_L),Y ; load byte, set as slide step high ; 5
|
|
iny ; 2
|
|
sta note_a+NOTE_TONE_SLIDE_STEP_H,X ; 5
|
|
|
|
jmp no_effect ; 3
|
|
|
|
;==============================
|
|
; Effect #2 -- Portamento
|
|
;==============================
|
|
effect_2:
|
|
cmp #$2 ; 2
|
|
beq effect_2_small ; 3
|
|
; -1
|
|
jmp effect_3 ; 3
|
|
effect_2_small: ; FIXME: make smaller
|
|
lda #0 ; 2
|
|
sta note_a+NOTE_SIMPLE_GLISS,X ; 5
|
|
sta note_a+NOTE_ONOFF,X ; 5
|
|
|
|
lda (PATTERN_L),Y ; load byte, set as delay ; 5
|
|
iny ; 2
|
|
|
|
sta note_a+NOTE_TONE_SLIDE_DELAY,X ; 5
|
|
sta note_a+NOTE_TONE_SLIDE_COUNT,X ; 5
|
|
|
|
iny ; 2
|
|
iny ; 2
|
|
iny ; 2
|
|
|
|
lda (PATTERN_L),Y ; load byte, set as slide_step high ; 5
|
|
php ; 3
|
|
|
|
; 16-bit absolute value
|
|
bpl slide_step_positive1 ; 3
|
|
;-1
|
|
eor #$ff ; 2
|
|
|
|
slide_step_positive1:
|
|
sta note_a+NOTE_TONE_SLIDE_STEP_H,X ; 5
|
|
dey ; 2
|
|
lda (PATTERN_L),Y ; load byte, set as slide_step low ; 5
|
|
plp ; 4
|
|
clc ; 2
|
|
bpl slide_step_positive2 ; 3
|
|
;-1
|
|
eor #$ff ; 2
|
|
sec ; 2
|
|
|
|
slide_step_positive2:
|
|
adc #$0 ; 2
|
|
sta note_a+NOTE_TONE_SLIDE_STEP_L,X ; 5
|
|
bcc skip_step_inc1 ; 3
|
|
inc note_a+NOTE_TONE_SLIDE_STEP_H,X ; 7
|
|
skip_step_inc1:
|
|
|
|
|
|
iny ; moved here as it messed with flags ; 2
|
|
iny ; 2
|
|
|
|
|
|
; a->tone_delta=GetNoteFreq(a->note,pt3)-
|
|
; GetNoteFreq(prev_note,pt3);
|
|
|
|
sty PT3_TEMP ; save Y
|
|
prev_note_smc:
|
|
ldy #$d1
|
|
lda NoteTable_low,Y ; GetNoteFreq
|
|
sta temp_word_l2_smc+1
|
|
lda NoteTable_high,Y ; GetNoteFreq
|
|
sta temp_word_h2_smc+1
|
|
|
|
ldy note_a+NOTE_NOTE,X
|
|
lda NoteTable_low,Y ; GetNoteFreq
|
|
|
|
sec
|
|
temp_word_l2_smc:
|
|
sbc #$d1
|
|
sta note_a+NOTE_TONE_DELTA_L,X
|
|
lda NoteTable_high,Y ; GetNoteFreq
|
|
temp_word_h2_smc:
|
|
sbc #$d1
|
|
sta note_a+NOTE_TONE_DELTA_H,X
|
|
|
|
; a->slide_to_note=a->note;
|
|
lda note_a+NOTE_NOTE,X
|
|
sta note_a+NOTE_SLIDE_TO_NOTE,X
|
|
|
|
ldy PT3_TEMP ; restore Y
|
|
|
|
; a->note=prev_note;
|
|
lda prev_note_smc+1
|
|
sta note_a+NOTE_NOTE,X
|
|
|
|
; implement file version 6 and above slide behavior
|
|
; this is done by SMC at song init time
|
|
version_smc:
|
|
jmp weird_version ; (JMP to BIT via smc) ; 3
|
|
|
|
prev_sliding_l_smc:
|
|
lda #$d1
|
|
sta note_a+NOTE_TONE_SLIDING_L,X
|
|
prev_sliding_h_smc:
|
|
lda #$d1
|
|
sta note_a+NOTE_TONE_SLIDING_H,X
|
|
|
|
weird_version:
|
|
|
|
; annoying 16-bit subtract, only care if negative
|
|
; if ((a->tone_delta - a->tone_sliding) < 0) {
|
|
sec
|
|
lda note_a+NOTE_TONE_DELTA_L,X
|
|
sbc note_a+NOTE_TONE_SLIDING_L,X
|
|
lda note_a+NOTE_TONE_DELTA_H,X
|
|
sbc note_a+NOTE_TONE_SLIDING_H,X
|
|
bpl no_effect
|
|
|
|
; a->tone_slide_step = -a->tone_slide_step;
|
|
|
|
lda note_a+NOTE_TONE_SLIDE_STEP_L,X
|
|
eor #$ff
|
|
clc
|
|
adc #$1
|
|
sta note_a+NOTE_TONE_SLIDE_STEP_L,X
|
|
lda note_a+NOTE_TONE_SLIDE_STEP_H,X
|
|
eor #$ff
|
|
adc #$0
|
|
sta note_a+NOTE_TONE_SLIDE_STEP_H,X
|
|
|
|
jmp no_effect
|
|
|
|
;==============================
|
|
; Effect #3 -- Sample Position
|
|
;==============================
|
|
effect_3:
|
|
cmp #$3
|
|
bne effect_4
|
|
|
|
lda (PATTERN_L),Y ; load byte, set as sample position
|
|
iny
|
|
sta note_a+NOTE_SAMPLE_POSITION,X
|
|
|
|
bne no_effect ; branch always
|
|
|
|
;==============================
|
|
; Effect #4 -- Ornament Position
|
|
;==============================
|
|
effect_4:
|
|
cmp #$4
|
|
bne effect_5
|
|
|
|
lda (PATTERN_L),Y ; load byte, set as ornament position
|
|
iny
|
|
sta note_a+NOTE_ORNAMENT_POSITION,X
|
|
|
|
bne no_effect ; branch always
|
|
|
|
;==============================
|
|
; Effect #5 -- Vibrato
|
|
;==============================
|
|
effect_5:
|
|
cmp #$5
|
|
bne effect_8
|
|
|
|
lda (PATTERN_L),Y ; load byte, set as onoff delay
|
|
iny
|
|
sta note_a+NOTE_ONOFF_DELAY,X
|
|
sta note_a+NOTE_ONOFF,X
|
|
|
|
lda (PATTERN_L),Y ; load byte, set as offon delay
|
|
iny
|
|
sta note_a+NOTE_OFFON_DELAY,X
|
|
|
|
lda #0
|
|
sta note_a+NOTE_TONE_SLIDE_COUNT,X
|
|
sta note_a+NOTE_TONE_SLIDING_L,X
|
|
sta note_a+NOTE_TONE_SLIDING_H,X
|
|
|
|
beq no_effect ; branch always
|
|
|
|
;==============================
|
|
; Effect #8 -- Envelope Down
|
|
;==============================
|
|
effect_8:
|
|
cmp #$8
|
|
bne effect_9
|
|
|
|
; delay
|
|
lda (PATTERN_L),Y ; load byte, set as speed
|
|
iny
|
|
sta pt3_envelope_delay_smc+1
|
|
sta pt3_envelope_delay_orig_smc+1
|
|
|
|
; low value
|
|
lda (PATTERN_L),Y ; load byte, set as low
|
|
iny
|
|
sta pt3_envelope_slide_add_l_smc+1
|
|
|
|
; high value
|
|
lda (PATTERN_L),Y ; load byte, set as high
|
|
iny
|
|
sta pt3_envelope_slide_add_h_smc+1
|
|
|
|
bne no_effect ; branch always
|
|
|
|
;==============================
|
|
; Effect #9 -- Set Speed
|
|
;==============================
|
|
effect_9:
|
|
cmp #$9
|
|
bne no_effect
|
|
|
|
lda (PATTERN_L),Y ; load byte, set as speed
|
|
iny
|
|
sta pt3_speed_smc+1
|
|
|
|
no_effect:
|
|
|
|
;================================
|
|
; add y into the address pointer
|
|
|
|
clc
|
|
tya
|
|
adc note_a+NOTE_ADDR_L,X
|
|
sta note_a+NOTE_ADDR_L,X
|
|
lda #0
|
|
adc note_a+NOTE_ADDR_H,X
|
|
sta note_a+NOTE_ADDR_H,X
|
|
sta PATTERN_H
|
|
|
|
rts
|
|
|
|
|
|
;=======================================
|
|
; Set Envelope
|
|
;=======================================
|
|
; pulls out common code from $1X and $BX
|
|
; commands
|
|
|
|
; A = new envelope type
|
|
|
|
set_envelope:
|
|
|
|
sta pt3_envelope_type_smc+1 ; 4
|
|
|
|
; give fake old to force update? maybe only needed if printing?
|
|
; pt3->envelope_type_old=0x78;
|
|
|
|
lda #$78 ; 2
|
|
sta pt3_envelope_type_old_smc+1 ; 4
|
|
|
|
; get next byte
|
|
iny ; 2
|
|
lda (PATTERN_L),Y ; 5+
|
|
sta pt3_envelope_period_h_smc+1 ; 4
|
|
|
|
iny ; 2
|
|
lda (PATTERN_L),Y ; 5+
|
|
sta pt3_envelope_period_l_smc+1 ; 4
|
|
|
|
lda #1 ; 2
|
|
sta note_a+NOTE_ENVELOPE_ENABLED,X ; envelope_enabled=1 ; 5
|
|
lsr ; 2
|
|
sta note_a+NOTE_ORNAMENT_POSITION,X ; ornament_position=0 ; 5
|
|
sta pt3_envelope_delay_smc+1 ; envelope_delay=0 ; 4
|
|
sta pt3_envelope_slide_l_smc+1 ; envelope_slide=0 ; 4
|
|
sta pt3_envelope_slide_h_smc+1 ; 4
|
|
|
|
rts ; 6
|
|
;===========
|
|
; 64
|
|
|
|
;========================
|
|
; reset note
|
|
;========================
|
|
; common code from the decode note code
|
|
|
|
reset_note:
|
|
lda #0 ; 2
|
|
sta note_a+NOTE_SAMPLE_POSITION,X ; sample_position=0 ; 5
|
|
sta note_a+NOTE_AMPLITUDE_SLIDING,X ; amplitude_sliding=0 ; 5
|
|
sta note_a+NOTE_NOISE_SLIDING,X ; noise_sliding=0 ; 5
|
|
sta note_a+NOTE_ENVELOPE_SLIDING,X ; envelope_sliding=0 ; 5
|
|
sta note_a+NOTE_ORNAMENT_POSITION,X ; ornament_position=0 ; 5
|
|
sta note_a+NOTE_TONE_SLIDE_COUNT,X ; tone_slide_count=0 ; 5
|
|
sta note_a+NOTE_TONE_SLIDING_L,X ; tone_sliding=0 ; 5
|
|
sta note_a+NOTE_TONE_SLIDING_H,X ; 5
|
|
sta note_a+NOTE_TONE_ACCUMULATOR_L,X ; tone_accumulator=0 ; 5
|
|
sta note_a+NOTE_TONE_ACCUMULATOR_H,X ; 5
|
|
sta note_a+NOTE_ONOFF,X ; onoff=0; ; 5
|
|
|
|
rts ; 6
|
|
;============
|
|
; 69
|
|
|
|
|
|
|
|
|
|
|
|
|
|
;=====================================
|
|
; Set Pattern
|
|
;=====================================
|
|
; FIXME: inline this? we do call it from outside
|
|
; in the player note length code
|
|
|
|
is_done:
|
|
; done with song, set it to non-zero
|
|
sta DONE_SONG ; 3
|
|
rts ; 6
|
|
|
|
pt3_set_pattern:
|
|
|
|
; Lookup current pattern in pattern table
|
|
current_pattern_smc:
|
|
ldy #$d1 ; 2
|
|
lda PT3_LOC+PT3_PATTERN_TABLE,Y ; 4+
|
|
|
|
; if value is $FF we are at the end of the song
|
|
cmp #$ff ; 2
|
|
beq is_done ; 2/3
|
|
|
|
;============
|
|
; 20 if end
|
|
|
|
not_done:
|
|
|
|
; set up the three pattern address pointers
|
|
|
|
asl ; mul pattern offset by two, as word sized ; 2
|
|
tay ; 2
|
|
|
|
; point PATTERN_H/PATTERN_L to the pattern address table
|
|
|
|
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
|
|
|
|
; First 16-bits points to the Channel A address
|
|
lda (PATTERN_L),Y ; 5+
|
|
sta note_a+NOTE_ADDR_L ; 4
|
|
iny ; 2
|
|
lda (PATTERN_L),Y ; 5+
|
|
adc #>PT3_LOC ; assume page boundary ; 2
|
|
sta note_a+NOTE_ADDR_H ; 4
|
|
iny ; 2
|
|
|
|
; 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
|
|
|
|
; 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
|
|
|
|
; clear out the noise channel
|
|
lda #0 ; 2
|
|
sta pt3_noise_period_smc+1 ; 4
|
|
|
|
; 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_smc+1 ; 4
|
|
|
|
rts ; 6
|
|
|
|
|
|
|
|
;=====================================
|
|
; pt3 make frame
|
|
;=====================================
|
|
; update pattern or line if necessary
|
|
; then calculate the values for the next frame
|
|
|
|
;==========================
|
|
; pattern done early!
|
|
|
|
early_end:
|
|
inc current_pattern_smc+1 ; increment pattern ; 6
|
|
sta current_line_smc+1 ; 4
|
|
sta current_subframe_smc+1 ; 4
|
|
|
|
check_subframe:
|
|
lda current_subframe_smc+1 ; 4
|
|
bne pattern_good ; 2/3
|
|
|
|
; load a new pattern in
|
|
jsr pt3_set_pattern ;6+?
|
|
|
|
lda DONE_SONG ; 3
|
|
beq pattern_good ; 2/3
|
|
rts ; 6
|
|
|
|
pt3_make_frame:
|
|
|
|
; see if we need a new pattern
|
|
; we do if line==0 and subframe==0
|
|
; allow fallthrough where possible
|
|
current_line_smc:
|
|
lda #$d1 ; 2
|
|
beq check_subframe ; 2/3
|
|
|
|
pattern_good:
|
|
|
|
; see if we need a new line
|
|
|
|
current_subframe_smc:
|
|
lda #$d1 ; 2
|
|
bne line_good ; 2/3
|
|
|
|
; decode a new line
|
|
jsr pt3_decode_line ; 6+?
|
|
|
|
; check if pattern done early
|
|
pt3_pattern_done_smc:
|
|
lda #$d1 ; 2
|
|
beq early_end ; 2/3
|
|
|
|
line_good:
|
|
|
|
; Increment everything
|
|
|
|
inc current_subframe_smc+1 ; subframe++ ; 6
|
|
lda current_subframe_smc+1 ; 4
|
|
|
|
; if we hit pt3_speed, move to next
|
|
pt3_speed_smc:
|
|
eor #$d1 ; 2
|
|
bne do_frame ; 2/3
|
|
|
|
next_line:
|
|
sta current_subframe_smc+1 ; reset subframe to 0 ; 4
|
|
|
|
inc current_line_smc+1 ; and increment line ; 6
|
|
lda current_line_smc+1 ; 4
|
|
|
|
eor #64 ; always end at 64. ; 2
|
|
bne do_frame ; is this always needed? ; 2/3
|
|
|
|
next_pattern:
|
|
sta current_line_smc+1 ; reset line to 0 ; 4
|
|
|
|
inc current_pattern_smc+1 ; increment pattern ; 6
|
|
|
|
do_frame:
|
|
; AY-3-8910 register summary
|
|
;
|
|
; R0/R1 = A period low/high
|
|
; R2/R3 = B period low/high
|
|
; R4/R5 = C period low/high
|
|
; R6 = Noise period
|
|
; R7 = Enable XX Noise=!CBA Tone=!CBA
|
|
; R8/R9/R10 = Channel A/B/C amplitude M3210, M=envelope enable
|
|
; R11/R12 = Envelope Period low/high
|
|
; R13 = Envelope Shape, 0xff means don't write
|
|
; R14/R15 = I/O (ignored)
|
|
|
|
ldx #0 ; needed ; 2
|
|
stx PT3_MIXER_VAL ; 3
|
|
stx pt3_envelope_add_smc+1 ; 4
|
|
|
|
;;ldx #(NOTE_STRUCT_SIZE*0) ; Note A ; 2
|
|
jsr calculate_note ; 6+?
|
|
ldx #(NOTE_STRUCT_SIZE*1) ; Note B ; 2
|
|
jsr calculate_note ; 6+?
|
|
ldx #(NOTE_STRUCT_SIZE*2) ; Note C ; 2
|
|
jsr calculate_note ; 6+?
|
|
|
|
convert_177_smc1:
|
|
sec ; 2
|
|
|
|
; Load up the Frequency Registers
|
|
|
|
lda note_a+NOTE_TONE_L ; Note A Period L ; 4
|
|
sta AY_REGISTERS+0 ; into R0 ; 3
|
|
|
|
lda note_a+NOTE_TONE_H ; Note A Period H ; 4
|
|
sta AY_REGISTERS+1 ; into R1 ; 3
|
|
lda note_a+NOTE_TONE_L ; Note A Period L ; 4
|
|
bcc no_scale_a ; 2/3
|
|
|
|
; Convert from 1.77MHz to 1MHz by multiplying by 9/16
|
|
|
|
; conversion costs 100 cycles!
|
|
|
|
; first multiply by 8
|
|
asl ; 2
|
|
rol AY_REGISTERS+1 ; 5
|
|
asl ; 2
|
|
rol AY_REGISTERS+1 ; 5
|
|
asl ; 2
|
|
rol AY_REGISTERS+1 ; 5
|
|
|
|
; add in original to get 9
|
|
clc ; 2
|
|
adc note_a+NOTE_TONE_L ; 4
|
|
sta AY_REGISTERS+0 ; 3
|
|
lda note_a+NOTE_TONE_H ; 4
|
|
adc AY_REGISTERS+1 ; 3
|
|
|
|
; divide by 16 to get proper value
|
|
ror ; 2
|
|
ror AY_REGISTERS+0 ; 5
|
|
ror ; 2
|
|
ror AY_REGISTERS+0 ; 5
|
|
ror ; 2
|
|
ror AY_REGISTERS+0 ; 5
|
|
ror ; 2
|
|
ror AY_REGISTERS+0 ; 5
|
|
and #$0f ; 2
|
|
sta AY_REGISTERS+1 ; 3
|
|
|
|
no_scale_a:
|
|
|
|
convert_177_smc2:
|
|
sec ; 2
|
|
|
|
lda note_b+NOTE_TONE_L ; Note B Period L ; 4
|
|
sta AY_REGISTERS+2 ; into R2 ; 3
|
|
|
|
lda note_b+NOTE_TONE_H ; Note B Period H ; 4
|
|
sta AY_REGISTERS+3 ; into R3 ; 3
|
|
lda note_b+NOTE_TONE_L ; Note B Period L ; 4
|
|
bcc no_scale_b ; 2/3
|
|
|
|
; Convert from 1.77MHz to 1MHz by multiplying by 9/16
|
|
|
|
; first multiply by 8
|
|
asl ; 2
|
|
rol AY_REGISTERS+3 ; 5
|
|
asl ; 2
|
|
rol AY_REGISTERS+3 ; 5
|
|
asl ; 2
|
|
rol AY_REGISTERS+3 ; 5
|
|
|
|
; add in original to get 9
|
|
clc ; 2
|
|
adc note_b+NOTE_TONE_L ; 4
|
|
sta AY_REGISTERS+2 ; 3
|
|
lda note_b+NOTE_TONE_H ; 4
|
|
adc AY_REGISTERS+3 ; 3
|
|
|
|
; divide by 16 to get proper value
|
|
ror ; 2
|
|
ror AY_REGISTERS+2 ; 5
|
|
ror ; 2
|
|
ror AY_REGISTERS+2 ; 5
|
|
ror ; 2
|
|
ror AY_REGISTERS+2 ; 5
|
|
ror ; 2
|
|
ror AY_REGISTERS+2 ; 5
|
|
and #$0f ; 2
|
|
sta AY_REGISTERS+3 ; 3
|
|
|
|
no_scale_b:
|
|
|
|
convert_177_smc3:
|
|
sec ; 2
|
|
|
|
lda note_c+NOTE_TONE_L ; Note C Period L ; 4
|
|
sta AY_REGISTERS+4 ; into R4 ; 3
|
|
lda note_c+NOTE_TONE_H ; Note C Period H ; 4
|
|
sta AY_REGISTERS+5 ; into R5 ; 3
|
|
lda note_c+NOTE_TONE_L ; Note C Period L ; 4
|
|
bcc no_scale_c ; 2/3
|
|
|
|
; Convert from 1.77MHz to 1MHz by multiplying by 9/16
|
|
|
|
; first multiply by 8
|
|
asl ; 2
|
|
rol AY_REGISTERS+5 ; 5
|
|
asl ; 2
|
|
rol AY_REGISTERS+5 ; 5
|
|
asl ; 2
|
|
rol AY_REGISTERS+5 ; 5
|
|
|
|
; add in original to get 9
|
|
clc ; 2
|
|
adc note_c+NOTE_TONE_L ; 4
|
|
sta AY_REGISTERS+4 ; 3
|
|
lda note_c+NOTE_TONE_H ; 4
|
|
adc AY_REGISTERS+5 ; 3
|
|
|
|
; divide by 16 to get proper value
|
|
ror ; 2
|
|
ror AY_REGISTERS+4 ; 5
|
|
ror ; 2
|
|
ror AY_REGISTERS+4 ; 5
|
|
ror ; 2
|
|
ror AY_REGISTERS+4 ; 5
|
|
ror ; 2
|
|
ror AY_REGISTERS+4 ; 5
|
|
and #$0f ; 2
|
|
sta AY_REGISTERS+5 ; 3
|
|
|
|
no_scale_c:
|
|
|
|
|
|
; Noise
|
|
; frame[6]= (pt3->noise_period+pt3->noise_add)&0x1f;
|
|
clc ; 2
|
|
pt3_noise_period_smc:
|
|
lda #$d1 ; 2
|
|
pt3_noise_add_smc:
|
|
adc #$d1 ; 2
|
|
and #$1f ; 2
|
|
sta AY_REGISTERS+6 ; 3
|
|
|
|
convert_177_smc4:
|
|
sec ; 2
|
|
bcc no_scale_n ; 2/3
|
|
|
|
; Convert from 1.77MHz to 1MHz by multiplying by 9/16
|
|
|
|
; first multiply by 8
|
|
asl ; 2
|
|
asl ; 2
|
|
asl ; 2
|
|
|
|
; add in original to get 9
|
|
adc AY_REGISTERS+6 ; 3
|
|
|
|
; divide by 16 to get proper value
|
|
ror ; 2
|
|
ror ; 2
|
|
ror ; 2
|
|
ror ; 2
|
|
and #$1f ; 2
|
|
|
|
no_scale_n:
|
|
sta AY_REGISTERS+6 ; 3
|
|
|
|
;=======================
|
|
; Mixer
|
|
|
|
; PT3_MIXER_VAL is already in AY_REGISTERS+7
|
|
|
|
;=======================
|
|
; Amplitudes
|
|
|
|
lda note_a+NOTE_AMPLITUDE ; 3
|
|
sta AY_REGISTERS+8 ; 3
|
|
lda note_b+NOTE_AMPLITUDE ; 3
|
|
sta AY_REGISTERS+9 ; 3
|
|
lda note_c+NOTE_AMPLITUDE ; 3
|
|
sta AY_REGISTERS+10 ; 3
|
|
|
|
;======================================
|
|
; Envelope period
|
|
; result=period+add+slide (16-bits)
|
|
clc ; 2
|
|
pt3_envelope_period_l_smc:
|
|
lda #$d1 ; 2
|
|
pt3_envelope_add_smc:
|
|
adc #$d1 ; 2
|
|
tay ; 2
|
|
pt3_envelope_period_h_smc:
|
|
lda #$d1 ; 2
|
|
adc #0 ; 2
|
|
tax ; 2
|
|
|
|
clc ; 2
|
|
tya ; 2
|
|
pt3_envelope_slide_l_smc:
|
|
adc #$d1 ; 2
|
|
sta AY_REGISTERS+11 ; 3
|
|
txa ; 2
|
|
pt3_envelope_slide_h_smc:
|
|
adc #$d1 ; 2
|
|
sta AY_REGISTERS+12 ; 3
|
|
|
|
convert_177_smc5:
|
|
sec
|
|
bcc no_scale_e ; 2/3
|
|
|
|
; Convert from 1.77MHz to 1MHz by multiplying by 9/16
|
|
|
|
tay ; 2
|
|
; first multiply by 8
|
|
lda AY_REGISTERS+11 ; 3
|
|
asl ; 2
|
|
rol AY_REGISTERS+12 ; 5
|
|
asl ; 2
|
|
rol AY_REGISTERS+12 ; 5
|
|
asl ; 2
|
|
rol AY_REGISTERS+12 ; 5
|
|
|
|
; add in original to get 9
|
|
clc ; 2
|
|
adc AY_REGISTERS+11 ; 3
|
|
sta AY_REGISTERS+11 ; 3
|
|
tya ; 2
|
|
adc AY_REGISTERS+12 ; 3
|
|
|
|
; divide by 16 to get proper value
|
|
ror ; 2
|
|
ror AY_REGISTERS+11 ; 5
|
|
ror ; 2
|
|
ror AY_REGISTERS+11 ; 5
|
|
ror ; 2
|
|
ror AY_REGISTERS+11 ; 5
|
|
ror ; 2
|
|
ror AY_REGISTERS+11 ; 5
|
|
and #$0f ; 2
|
|
sta AY_REGISTERS+12 ; 3
|
|
|
|
no_scale_e:
|
|
|
|
;========================
|
|
; Envelope shape
|
|
|
|
pt3_envelope_type_smc:
|
|
lda #$d1 ; 2
|
|
pt3_envelope_type_old_smc:
|
|
cmp #$d1 ; 2
|
|
sta pt3_envelope_type_old_smc+1; copy old to new ; 4
|
|
bne envelope_diff ; 2/3
|
|
envelope_same:
|
|
lda #$ff ; if same, store $ff ; 2
|
|
envelope_diff:
|
|
sta AY_REGISTERS+13 ; 3
|
|
|
|
|
|
|
|
;==============================
|
|
; end-of-frame envelope update
|
|
;==============================
|
|
|
|
pt3_envelope_delay_smc:
|
|
lda #$d1 ; 2
|
|
beq done_do_frame ; assume can't be negative? ; 2/3
|
|
; do this if envelope_delay>0
|
|
dec pt3_envelope_delay_smc+1 ; 6
|
|
bne done_do_frame ; 2/3
|
|
; only do if we hit 0
|
|
pt3_envelope_delay_orig_smc:
|
|
lda #$d1 ; reset envelope delay ; 2
|
|
sta pt3_envelope_delay_smc+1 ; 4
|
|
|
|
clc ; 16-bit add ; 2
|
|
lda pt3_envelope_slide_l_smc+1 ; 4
|
|
pt3_envelope_slide_add_l_smc:
|
|
adc #$d1 ; 2
|
|
sta pt3_envelope_slide_l_smc+1 ; 4
|
|
lda pt3_envelope_slide_h_smc+1 ; 4
|
|
pt3_envelope_slide_add_h_smc:
|
|
adc #$d1 ; 2
|
|
sta pt3_envelope_slide_h_smc+1 ; 4
|
|
|
|
done_do_frame:
|
|
|
|
rts ; 6
|
|
|
|
|
|
; note, you might have slightly better performance if these are aligned
|
|
; so that loads don't have to cross page boundaries
|
|
|
|
NoteTable_high:
|
|
.res 96,0
|
|
NoteTable_low:
|
|
.res 96,0
|
|
|
|
VolumeTable:
|
|
.res 256,0
|
|
|
|
|
|
pt3_lib_end:
|