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interlace: more work on cycle counting

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This commit is contained in:
Vince Weaver 2019-09-14 10:39:25 -04:00
parent bbf26118bb
commit ac5b22d700
1 changed files with 79 additions and 32 deletions
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111
interlace_demo/pt3_lib_core.s
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@ -251,12 +251,25 @@ load_ornament:
; Calculate Note
;=====================================
; note offset in X
; 6+2+52 = 60
; 7 + 6 + [???] = note disabled
; FIXME: samples shouldn't cross page boundary
; 7 -- first check
; 38 -- note enabled
; 20 -- sample1
; 30 -- sample2
; 21 -- accumulate
; 15 -- calc tone
; 12 -- note bounds
; 50 -- more tone
; 44 -- done note
;=====
;
; note disabled = 7 + 6 + [????] + 44 = 57
calculate_note:
.if 0
lda note_a+NOTE_ENABLED,X ; 4
bne note_enabled ; 3
@ -266,21 +279,23 @@ calculate_note:
note_enabled:
lda note_a+NOTE_SAMPLE_POINTER_H,X ; 4+
lda note_a+NOTE_SAMPLE_POINTER_H,X ; 4
sta SAMPLE_H ; 3
lda note_a+NOTE_SAMPLE_POINTER_L,X ; 4+
lda note_a+NOTE_SAMPLE_POINTER_L,X ; 4
sta SAMPLE_L ; 3
lda note_a+NOTE_ORNAMENT_POINTER_H,X ; 4+
lda note_a+NOTE_ORNAMENT_POINTER_H,X ; 4
sta ORNAMENT_H ; 3
lda note_a+NOTE_ORNAMENT_POINTER_L,X ; 4+
lda note_a+NOTE_ORNAMENT_POINTER_L,X ; 4
sta ORNAMENT_L ; 3
lda note_a+NOTE_SAMPLE_POSITION,X ; 4+
lda note_a+NOTE_SAMPLE_POSITION,X ; 4
asl ; 2
asl ; 2
tay ; 2
;===========
; 38
; b0 = pt3->data[a->sample_pointer + a->sample_position * 4];
lda (SAMPLE_L),Y ; 5+
@ -290,56 +305,88 @@ note_enabled:
iny ; 2
lda (SAMPLE_L),Y ; 5+
sta sample_b1_smc+1 ; 4
;=============
; 20
; a->tone = pt3->data[a->sample_pointer + a->sample_position*4+2];
; a->tone+=(pt3->data[a->sample_pointer + a->sample_position*4+3])<<8;
; a->tone += a->tone_accumulator;
iny ; 2
lda (SAMPLE_L),Y ; 5+
adc note_a+NOTE_TONE_ACCUMULATOR_L,X ; 4+
adc note_a+NOTE_TONE_ACCUMULATOR_L,X ; 4
sta note_a+NOTE_TONE_L,X ; 4
iny ; 2
lda (SAMPLE_L),Y ; 5+
adc note_a+NOTE_TONE_ACCUMULATOR_H,X ; 4+
adc note_a+NOTE_TONE_ACCUMULATOR_H,X ; 4
sta note_a+NOTE_TONE_H,X ; 4
;============
; 30
;=============================
; Accumulate tone if set
; (if sample_b1 & $40)
; set = 7+14 = 21
; no-set = 7+[14] = 21
bit sample_b1_smc+1 ; 4
bvc no_accum_waste ; (so, if b1&0x40 is zero, skip it) ; 3
bit sample_b1_smc+1
bvc no_accum ; (so, if b1&0x40 is zero, skip it)
; -1
sta note_a+NOTE_TONE_ACCUMULATOR_H,X
lda note_a+NOTE_TONE_L,X ; tone_accumulator=tone
sta note_a+NOTE_TONE_ACCUMULATOR_L,X
no_accum:
sta note_a+NOTE_TONE_ACCUMULATOR_H,X ; 4
lda note_a+NOTE_TONE_L,X ; tone_accumulator=tone ; 4
sta note_a+NOTE_TONE_ACCUMULATOR_L,X ; 4
jmp no_accum_real ; 3
no_accum_waste:
inc CYCLE_WASTE ; 5
inc CYCLE_WASTE ; 5
nop ; 2
nop ; 2
no_accum_real:
;============
; 21
;============================
; Calculate tone
; j = a->note + (pt3->data[a->ornament_pointer + a->ornament_position]
clc ;;can be removed if ADC ACCUMULATOR_H cannot overflow
ldy note_a+NOTE_ORNAMENT_POSITION,X
lda (ORNAMENT_L),Y
adc note_a+NOTE_NOTE,X
clc ;;can be removed if ADC ACCUMULATOR_H cannot overflow ; 2
ldy note_a+NOTE_ORNAMENT_POSITION,X ; 4
lda (ORNAMENT_L),Y ; 5+
adc note_a+NOTE_NOTE,X ; 4
;============
; 15
; <0 -- 3+4+[5] = 12
; >95 -- 3+5+4 = 12
; just right --3+5+[4] = 12
; if (j < 0) j = 0;
bpl note_not_negative
lda #0
bpl note_not_negative ; 3
; -1
lda #0 ; 2
jmp note_just_right_waste5 ; 3
; if (j > 95) j = 95;
note_not_negative:
cmp #96
bcc note_not_too_high ; blt
.endif
cmp #96 ; 2
bcc note_not_too_high ; blt ; 3
; -1
lda #95 ; 2
jmp note_just_right_waste4 ; 3
note_not_too_high:
note_just_right_waste5:
nop ; 2
jmp note_just_right ; 3
note_just_right_waste4:
nop ; 2
nop ; 2
;===========
; 12
note_just_right:
; w = GetNoteFreq(j,pt3->frequency_table);
tay ; for GetNoteFreq later ; 2
@ -367,8 +414,8 @@ temp_word_h1_smc:
sta note_a+NOTE_TONE_H,X ; 4
;===========
; 52
.if 0
; 50
;=====================
; handle tone sliding
@ -674,7 +721,7 @@ sample_pos_ok:
lda note_a+NOTE_ORNAMENT_LOOP,X
sta note_a+NOTE_ORNAMENT_POSITION,X
ornament_pos_ok:
.endif
done_note:
; set mixer value