annotate cycles
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4361b4054d
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1 changed files with 55 additions and 47 deletions
102
dither4.s
102
dither4.s
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@ -133,13 +133,13 @@ wait_start:
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; Wait for the vblank
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; Resynchronize the scanline counter
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wait_loop:
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ldy VCOUNT
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bne wait_loop
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ldy VCOUNT ; 4 cycles
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bne wait_loop ; 2 cycles
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.macro audio_prep
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; Y is VCOUNT at entry
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lda (sample_ptr),y ; 5/6 cyc
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sta audiotemp ; 3 cyc
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sta audiotemp ; 3 cyc
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.endmacro
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.macro inner_scanline frame_offset, line_offset
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@ -148,27 +148,28 @@ wait_loop:
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;ldy scanline ; 3 cyc
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;inc scanline ; 5 cyc
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; 23-26 cycles before break
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; Leisurely memory fetches
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lda frame1_palette1_even + frame_offset + line_offset - scanline_offset / 2,y ; 5 @FIXME alternate
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pha ; ...3?
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ldx frame1_palette2_even + frame_offset + line_offset - scanline_offset / 2,y ; 5
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lda frame1_palette3_even + frame_offset + line_offset - scanline_offset / 2,y ; 5
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tay
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pla
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lda frame1_palette1_even + frame_offset + line_offset - scanline_offset / 2,y ; 4/5 @FIXME alternate
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pha ; 3
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ldx frame1_palette2_even + frame_offset + line_offset - scanline_offset / 2,y ; 4/5
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lda frame1_palette3_even + frame_offset + line_offset - scanline_offset / 2,y ; 4/5
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tay ; 2
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pla ; 3
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; Wait for horizontal blank
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sta WSYNC
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sta WSYNC ; 4
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; 12 cycles after break
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; Update color registers as fast as possible
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sta COLPF0
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stx COLPF1
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sty COLPF2
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sta COLPF0 ; 4
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stx COLPF1 ; 4
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sty COLPF2 ; 4
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.endmacro
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.macro audio_play_raw
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;ldy VCOUNT ; set on entry
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lda (sample_ptr),y ; 5/6 cyc
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sta AUDC1 ; 4 cyc
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sta AUDC1 ; 4 cyc
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.endmacro
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.macro audio_play_lo
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@ -186,25 +187,29 @@ wait_loop:
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.macro audio_inc
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; Increment sample ptr
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clc
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lda sample_ptrl
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adc #131
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sta sample_ptrl
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lda sample_ptrh
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adc #0
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sta sample_ptrh
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; 18 cycles
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clc ; 2
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lda sample_ptrl ; 3
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adc #131 ; 2
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sta sample_ptrl ; 3
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lda sample_ptrh ; 3
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adc #0 ; 2
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sta sample_ptrh ; 3
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cmp #.hibyte(audio_samples_end)
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bmi audio_cont
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; 4 cycles
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cmp #.hibyte(audio_samples_end) ; 2
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bmi audio_cont ; 2
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lda sample_ptrl
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cmp #.lobyte(audio_samples_end)
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bmi audio_cont
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; 7 cycles, optional
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lda sample_ptrl ; 3
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cmp #.lobyte(audio_samples_end) ; 2
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bmi audio_cont ; 2
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lda #.lobyte(audio_samples)
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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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; 10 cycles, optional
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lda #.lobyte(audio_samples) ; 2
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sta sample_ptrl ; 3
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lda #.hibyte(audio_samples) ; 2
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sta sample_ptrh ; 3
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audio_cont:
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.endmacro
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@ -213,32 +218,35 @@ wait_loop:
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.scope
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each_scanline_pair:
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;audio_prep
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sty scanline
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inner_scanline frame_offset, 0
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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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ldy scanline
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audio_play_raw
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ldy scanline ; 3 cycles
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audio_play_raw ; 9-10 cycles
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;audio_play_lo
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inner_scanline frame_offset, 128
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inner_scanline frame_offset, 128 ; 23-26 cycles before break, 12 cycles after
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;audio_play_raw
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;audio_play_hi ; too slow
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ldy VCOUNT ; save for audio lookup
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cpy #0
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bne each_scanline_pair
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; save for audio lookup
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ldy VCOUNT ; 4 cycles
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cpy #0 ; 2 cycles
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bne each_scanline_pair ; 2 cycles
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audio_inc ; @FIXME
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lda frame_counter
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eor #1
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sta frame_counter
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; only once when we hit scanline 0:
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audio_inc ; 22-39 cycles
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jmp wait_start
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lda frame_counter ; 3 cycles
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eor #1 ; 2 cycles
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sta frame_counter ; 3 cycles
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jmp wait_start ; 3 cycles
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.endscope
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.endmacro
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lda frame_counter
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beq run_frame1
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jmp run_frame2
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lda frame_counter ; 3 cycles
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beq run_frame1 ; 2 cycles
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jmp run_frame2 ; 3 cycles
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run_frame1:
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run_frame 0
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run_frame2:
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