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rotozoom: optimized the unrolled loop
This commit is contained in:
Vince Weaver
parent
9e68cd70f5
commit
97f20e3c0c
@ -14,6 +14,7 @@
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; $39e17=237,079=4.22fps change the init to also use multiply
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; $39dc9=237,001= change to use common lookup table (outside inner loop)
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; $3399f=211,359=4.73fps unroll the Y loop by one
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; $2BA83=178,819=5.59fps optimize unrolled loop
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CAL = $B0
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CAH = $B1
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@ -143,16 +144,16 @@ rotozoom:
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; for(yy=0;yy<40;yy++) {
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;===================================================================
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lda #0 ; 2
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sta YY ; 3
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ldy #0 ; 2
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sty YY ; 3
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rotozoom_yloop:
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; setup self-modifying code for plot
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ldy YY ; 3
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; YY already in Y from end of loop
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; ldy YY ; 3
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lda common_offsets_l,Y ; lookup low-res memory address ; 4
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sta rplot1_smc+1 ; 4
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sta rplot2_smc+1 ; 4
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sta rplot12_smc+1 ; 4
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sta rplot22_smc+1 ; 4
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@ -160,7 +161,6 @@ rotozoom_yloop:
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clc ; 2
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lda gr_400_offsets_h,Y ; 4
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adc DRAW_PAGE ; add in draw page offset ; 3
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sta rplot1_smc+2 ; 4
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sta rplot2_smc+2 ; 4
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sta rplot12_smc+2 ; 4
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sta rplot22_smc+2 ; 4
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@ -172,7 +172,7 @@ rotozoom_yloop:
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;=====================
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; xp=cca+ysa;
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; xp=cca+ysa; 8.8 fixed point
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clc ; 2
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lda YSAL ; 3
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adc CCAL ; 3
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@ -183,7 +183,7 @@ rotozoom_yloop:
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;==========
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; 20
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; yp=yca-csa;
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; yp=yca-csa; 8.8 fixed point
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sec ; 2
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lda YCAL ; 3
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@ -257,15 +257,16 @@ rotozoom_xloop:
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; carry was set a bit before to low bit of YPH
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; hopefully nothing has cleared it
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bcs rscrn_adjust_odd ; 3
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bcs rscrn_adjust_odd ; 2nt/3
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rscrn_adjust_even:
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; want bottom
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; YP was even so want bottom nibble
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and #$f ; 2
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jmp rscrn_done ; 3
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rscrn_adjust_odd:
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; YP was odd so want top nibble
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lsr ; 2
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lsr ; 2
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lsr ; 2
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@ -279,12 +280,12 @@ rscrn_done:
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; always even, want A in bottom of nibble
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; so we are all set
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rotozoom_set_color:
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; want same color in top and bottom nibbles
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and #$f
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;==========
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; 8
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; 0
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;=================================================
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@ -292,22 +293,23 @@ rplot:
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; plot(xx,yy); (color is in A)
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; we are in loop unroll0 so always even line here
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; always even line here
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; meaning we want to load old color, save top nibble, and over-write
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; bottom nibble with our value
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; but! we don't need to save old as we are re-drawing whole screen!
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rplot_even:
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sta COLOR ; 3
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lda #$f0 ; 2
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rplot1_smc:
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and $400,X ; 4
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ora COLOR ; 3
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rplot2_smc:
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sta $400,X ; 5
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;============
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; 5
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;=======================
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; xp=xp+ca;
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; xp=xp+ca; fixed point 8.8
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clc ; 2
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lda CAL ; 3
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@ -317,7 +319,7 @@ rplot2_smc:
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adc XPH ; 3
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sta XPH ; 3
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; yp=yp-sa;
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; yp=yp-sa; fixed point 8.8
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sec ; 2
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lda YPL ; 3
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@ -330,13 +332,12 @@ rplot2_smc:
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rotozoom_end_xloop:
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inx ; 2
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cpx #40 ; 2
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beq rotozoom_xloop_done ; 2nt/3
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jmp rotozoom_xloop ; 3
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bne rotozoom_xloop ; 2nt/3
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rotozoom_xloop_done:
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; yca+=ca;
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; yca+=ca; 8.8 fixed point
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clc ; 2
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lda YCAL ; 3
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@ -348,7 +349,7 @@ rotozoom_xloop_done:
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;===========
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; 20
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; ysa+=sa;
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; ysa+=sa; 8.8 fixed point
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clc ; 2
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lda YSAL ; 3
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@ -367,7 +368,7 @@ rotozoom_xloop_done:
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;rotozoom_yloop:
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; xp=cca+ysa;
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; xp=cca+ysa; 8.8 fixed point
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clc ; 2
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lda YSAL ; 3
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adc CCAL ; 3
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@ -378,7 +379,7 @@ rotozoom_xloop_done:
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;==========
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; 20
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; yp=yca-csa;
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; yp=yca-csa; 8.8 fixed point
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sec ; 2
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lda YCAL ; 3
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@ -454,15 +455,18 @@ rotozoom_xloop2:
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rscrn_adjust_even2:
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; want bottom
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and #$f ; 2
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; want bottom color, but put it in top of A
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asl ; 2
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asl ; 2
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asl ; 2
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asl ; 2
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jmp rscrn_done2 ; 3
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rscrn_adjust_odd2:
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lsr ; 2
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lsr ; 2
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lsr ; 2
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lsr ; 2
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; want top color alone
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and #$f0 ; 2
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rscrn_done2:
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@ -473,13 +477,9 @@ rscrn_done2:
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rotozoom_set_color2:
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; always odd
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; want color in top
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asl ; 2
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asl ; 2
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asl ; 2
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asl ; 2
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; want color in top, which it is from above
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;==========
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; 8
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; 0
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;=================================================
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@ -487,21 +487,23 @@ rplot2:
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; plot(xx,yy); (color is in A)
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; always odd
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; always odd, so place color in top
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; note! since we are drawing whole screen, we know the top of
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; the value is already clear from loop=0 so we don't have to mask
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rplot_odd:
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sta COLOR ; 3
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lda #$0f ; 2
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rplot12_smc:
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and $400,X ; 4
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ora COLOR ; 3
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ora $400,X ; 4
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rplot22_smc:
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sta $400,X ; 5
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;============
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; 9
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;=======================
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; xp=xp+ca;
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; xp=xp+ca; 8.8 fixed point
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clc ; 2
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lda CAL ; 3
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@ -511,7 +513,7 @@ rplot22_smc:
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adc XPH ; 3
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sta XPH ; 3
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; yp=yp-sa;
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; yp=yp-sa; 8.8 fixed point
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sec ; 2
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lda YPL ; 3
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@ -524,11 +526,10 @@ rplot22_smc:
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rotozoom_end_xloop2:
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inx ; 2
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cpx #40 ; 2
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beq rotozoom_xloop_done2 ; 2nt/3
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jmp rotozoom_xloop2 ; 3
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bne rotozoom_xloop2 ; 3
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rotozoom_xloop_done2:
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; yca+=ca;
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; yca+=ca; 8.8 fixed point
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clc ; 2
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lda YCAL ; 3
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@ -540,7 +541,7 @@ rotozoom_xloop_done2:
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;===========
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; 20
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; ysa+=sa;
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; ysa+=sa; 8.8 fixed point
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clc ; 2
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lda YSAL ; 3
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@ -554,8 +555,8 @@ rotozoom_xloop_done2:
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rotozoom_end_yloop:
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inc YY ; 5
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lda YY ; 3
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cmp #20 ; 2
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ldy YY ; 3
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cpy #20 ; 2
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beq done_rotozoom ; 2nt/3
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jmp rotozoom_yloop ; too far ; 3
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