wip
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79ac4b750e
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1 changed files with 10 additions and 13 deletions
23
dither4.s
23
dither4.s
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@ -27,6 +27,7 @@ sample_ptrh = $85
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sample_ptr = sample_ptrl
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scanline = $86
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audiotemp = $87
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sample_index = $80
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frame_counter = $89
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height = 160
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@ -94,6 +95,8 @@ audio_high_byte:
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sta sample_ptrl
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lda #.hibyte(audio_samples)
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sta sample_ptrh
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lda #0
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sta sample_index
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; Disable display DMA
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lda #$00
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@ -168,7 +171,7 @@ wait_loop:
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.macro audio_play_raw
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;ldy VCOUNT ; set on entry
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ldy #0 ; 2 cycles
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ldy sample_index ; 3 cycles
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lda (sample_ptr),y ; 5/6 cyc
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sta AUDC1 ; 4 cyc
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.endmacro
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@ -187,20 +190,17 @@ wait_loop:
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.endmacro
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.macro audio_inc
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; Increment sample ptr
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; 7 cycles
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inc sample_ptrl ; 5
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bne audio_cont ; 2
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inc sample_index ; 5 cycles
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bne audio_cont ; 2
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; 7 cycles, optional
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inc sample_ptrh ;5
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; 12 cycles, optional
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inc sample_ptrh ; 5
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lda sample_ptrh ; 3
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cmp #.hibyte(audio_samples_end) ; 2
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bmi audio_cont ; 2
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; 10 cycles, optional
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lda #.lobyte(audio_samples) ; 2
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sta sample_ptrl ; 3
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; 5 cycles, optional
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lda #.hibyte(audio_samples) ; 2
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sta sample_ptrh ; 3
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@ -210,18 +210,15 @@ wait_loop:
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.macro run_frame frame_offset
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.scope
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each_scanline_pair:
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;audio_prep
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sty scanline ; 3 cycles
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inner_scanline frame_offset, 0 ; 23-26 cycles before break, 12 cycles after
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audio_play_raw ; 11-12 cycles
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ldy scanline ; 3 cycles
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;audio_play_lo
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inner_scanline frame_offset, 128 ; 23-26 cycles before break, 12 cycles after
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audio_inc ; 7-24 cycles
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;audio_play_raw
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;audio_play_hi ; too slow
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; save for later lookup
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ldy VCOUNT ; 4 cycles
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