plasmag: cycle counting
This commit is contained in:
Vince Weaver
parent
e4e1f20770
commit
8c4fd13ca3
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@ -0,0 +1,35 @@
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Apple II display is 65 cycles per row
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65*192=12480(screen)+ 4550 more for vblank = 17030 cycles
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17030/1023000 = 60fps
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Theory maximum screen update
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completely unrolled 192*40*4 cycles = 30720 cycles
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30720 / 1023000 = 33 fps
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17030 cycles
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; Total of 12480 cycles to draw screen
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; Vertical blank = 4550 cycles (70 scan lines)
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; Total of 17030 cycles to get back to where was
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to fill the hi-res screen with a single color you need to update 7680
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bytes. If you completely unroll the loop this takes 30720 cycles, or
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roughly 33fps.
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This plasma algorithm if drawing the whole screen (192 lines) manages
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only 3fps. The video here I am skipping half the lines which gives
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5.5fps. I have a version drawing every 4th line which still looks OK
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that can do 9fps.
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The code is already heavily optimized with lots of self modifying code
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and table lookups. I'm losing some cycles to doing page flipping, and
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part of the problem is the Apple II's bizzarre framebuffer layout. I
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also waste cycles because I'm doing table lookups to get the dithered
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patterns, and again due to Apple II oddness (3.5 colored pixels per
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byte) I need separate lookups for odd/even columns
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@ -193,9 +193,15 @@ done_init_hires_colors_odd_l1:
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; ============================================================================
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; 26+( 24*(11+(40*(39+(38*2))) = 110,690 +2174 = 112,864 = 9fps
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; 26+( 24*(11+(40*(39+(38*4))) = 183,650 +2174 = 185,824 = 5.5fps
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; 26+( 24*(11+(40*(39+(38*8))) = 329,570 +2174 = = 3fps
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do_plasma:
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; init
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; lda #02
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; ldx #5
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;init_loop:
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@ -209,142 +215,163 @@ BP3:
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; Precalculate some values (inlined)
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; ROUTINES PRE CALCUL
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; ============================================================================
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;
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; cycles = 30 + (40*53) -1 + 25 = 2174 cycles
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precalc:
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lda PARAM1 ; self modify various parts
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sta pc_off1+1
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lda PARAM2
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sta pc_off2+1
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lda PARAM3
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sta pc_off3+1
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lda PARAM4
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sta pc_off4+1
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; 0
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lda PARAM1 ; self modify various parts ; 3
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sta pc_off1+1 ; 4
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lda PARAM2 ; 3
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sta pc_off2+1 ; 4
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lda PARAM3 ; 3
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sta pc_off3+1 ; 4
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lda PARAM4 ; 3
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sta pc_off4+1 ; 4
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; 28
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; Table1(X) = sin1(PARAM1+X)+sin2(PARAM1+X)
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; Table2(X) = sin3(PARAM3+X)+sin1(PARAM4+X)
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ldx #$28 ; 40
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pc_b1:
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ldx #$28 ; 40 ; 2
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; 30
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precalc_loop:
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pc_off1:
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lda sin1
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lda sin1 ; 4
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pc_off2:
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adc sin2
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sta Table1,X
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adc sin2 ; 4
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sta Table1,X ; 4
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; 12
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pc_off3:
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lda sin3
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lda sin3 ; 4
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pc_off4:
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adc sin1
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sta Table2,X
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adc sin1 ; 4
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sta Table2,X ; 4
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; 24
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inc pc_off1+1
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inc pc_off2+1
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inc pc_off3+1
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inc pc_off4+1
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inc pc_off1+1 ; 6
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inc pc_off2+1 ; 6
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inc pc_off3+1 ; 6
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inc pc_off4+1 ; 6
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; 48
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dex ; 2
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bpl precalc_loop ; 2/3
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; 53
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dex
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bpl pc_b1
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inc PARAM1
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inc PARAM1
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dec PARAM2
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inc PARAM3
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dec PARAM4
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inc PARAM1 ; 5
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inc PARAM1 ; 5
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dec PARAM2 ; 5
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inc PARAM3 ; 5
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dec PARAM4 ; 5
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; 25
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; ============================================================================
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; Display Routines
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; ROUTINES AFFICHAGES
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; ============================================================================
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; 26+( 24*(11+(40*(39+(38*2))) = 110,690
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; 26+( 24*(11+(40*(39+(38*4))) = 183,650
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; 26+( 24*(11+(40*(39+(38*8))) = 329,570
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; Display "Normal"
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; AFFICHAGE "NORMAL"
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display_normal:
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ldx #23 ; lines 0-23 lignes 0-23
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ldx #23 ; lines 0-23 lignes 0-23 ; 2
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display_line_loop:
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; 0
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lda hposn_low_div8,X ; setup line pointer ; 4
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sta GBASL ; 3
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; 7
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ldy #39 ; col 0-39 ; 2
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lda hposn_low_div8,X
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sta GBASL
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lda Table2,X ; setup base sine value for row ; 4
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sta display_row_sin_smc+1 ; 4
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; 17
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ldy #39 ; col 0-39
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lda Table2,X ; setup base sine value for row
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sta display_row_sin_smc+1
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display_col_loop:
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lda Table1,Y ; load in column sine value
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lda Table1,Y ; load in column sine value ; 4
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display_row_sin_smc:
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adc #00 ; add in row value
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sta display_lookup_smc+1 ; patch in low byte of lookup
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adc #00 ; add in row value ; 2
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sta display_lookup_smc+1 ; patch in low byte of lookup ; 4
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; 8
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; pick 0/1 for odd even
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lda display_lookup_smc+2
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eor #$01
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sta display_lookup_smc+2
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lda display_lookup_smc+2 ; 4
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eor #$01 ; 2
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sta display_lookup_smc+2 ; 4
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; 18
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; lda hires_colors_even_l0 ; attention: must be aligned
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; sta color_smc+1
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lda hposn_high_div8,X
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clc
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adc PAGE
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sta GBASH
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lda #1
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sta COUNT
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lda hposn_high_div8,X ; 4
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clc ; 2
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adc PAGE ; 3
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sta GBASH ; 3
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; 30
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lda #1 ; 2
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sta COUNT ; 3
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; 35
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store_loop:
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color_smc:
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lda display_lookup_smc+2
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eor #$02
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sta display_lookup_smc+2
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lda display_lookup_smc+2 ; 4
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eor #$02 ; 2
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sta display_lookup_smc+2 ; 4
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; 10
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display_lookup_smc:
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lda hires_colors_even_l0 ; attention: must be aligned
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lda hires_colors_even_l0 ; attention: must be aligned ; 4
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; lda #$fe
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sta (GBASL),Y
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clc
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lda #$10
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adc GBASH
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sta GBASH
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dec COUNT
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bpl store_loop
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dey
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bpl display_col_loop
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sta (GBASL),Y ; 6
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clc ; 2
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lda #$10 ; 2
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adc GBASH ; 3
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sta GBASH ; 3
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dec COUNT ; 5
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bpl store_loop ; 2/3
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; 38
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dex
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bpl display_line_loop
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dey ; 2
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bpl display_col_loop ; 2/3
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dex ; 2
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bpl display_line_loop ; 2/3
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; ============================================================================
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lda PAGE
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beq was_page1
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lda PAGE ; 3
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beq was_page1 ; 2/3
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was_page2:
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bit PAGE2
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lda #0
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beq done_pageflip
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bit PAGE2 ; 4
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lda #0 ; 2
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beq done_pageflip ; 2/3
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was_page1:
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bit PAGE1
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lda #$20
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bit PAGE1 ; 4
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lda #$20 ; 2
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done_pageflip:
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sta PAGE
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sta PAGE ; 3
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; 15?
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inc COMPT1 ; 6
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beq display_done2 ; 2/3
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inc COMPT1
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beq display_done2
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; bne BP3
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jmp BP3
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jmp BP3 ; 3
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display_done2:
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dec COMPT2
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beq display_done
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dec COMPT2 ; 6
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beq display_done ; 2/3
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; bne BP3
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jmp BP3
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jmp BP3 ; 3
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display_done:
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jmp do_plasma
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