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74 Commits
gun_picker
...
new_collis
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229
collisiontest.p8
Normal file
229
collisiontest.p8
Normal file
@ -0,0 +1,229 @@
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pico-8 cartridge // http://www.pico-8.com
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version 42
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__lua__
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bx0=0
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by0=0
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bx1=127
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by1=127
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lx0=0
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ly0=0
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lx1=127
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ly1=127
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-->8
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function collides()
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local tmin,tmax=0,1
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local ldx,ldy=lx1-lx0,ly1-ly0
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-- x
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if ldx==0 then
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if (lx0<bx0 or lx0>bx1) return
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else
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local tx0=(bx0-lx0)/ldx
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local tx1=(bx1-lx0)/ldx
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if (tx0 > tx1) tx0,tx1=tx1,tx0
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if (tmin < tx0) tmin=tx0
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if (tmax > tx1) tmax=tx1
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end
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if ldy==0 then
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if (ly0<by0 or ly0>by1) return
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else
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local ty0=(by0-ly0)/ldy
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local ty1=(by1-ly0)/ldy
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if (ty0 > ty1) ty0,ty1=ty1,ty0
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if (tmin < ty0) tmin=ty0
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if (tmax > ty1) tmax=ty1
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end
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if (tmax < tmin) return
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return tmin,tmax
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end
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-->8
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function _init()
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poke(0x5f2d,1) -- enable mouse
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end
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function _bounce_screen(x)
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return _bounce(x*128,128)
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end
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function _bounce(x,mx)
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x=x%(mx * 2)
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if (x>=mx)return mx-(x-mx)
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return x
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end
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function _to_halfopen(x0,x1)
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-- turn two numbers into a
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-- half-open integer range
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x0=flr(x0)
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x1=flr(x1)
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local lo=min(x0,x1)
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local hi=max(x0,x1)
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if (hi==lo) return lo,hi
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return lo,hi-1
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end
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function _update60()
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local t=time()/16
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local bx0_=_bounce_screen(t*1)
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local by0_=_bounce_screen(t*2)
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local bx1_=_bounce_screen(t*3)
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local by1_=_bounce_screen(t*4)
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bx0,bx1=_to_halfopen(bx0_,bx1_)
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by0,by1=_to_halfopen(by0_,by1_)
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update_line()
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--[[
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local lx0_=_bounce_screen(t*1.5)
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local ly0_=_bounce_screen(t*2.5)
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local lx1_=_bounce_screen(t*3.5)
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local ly1_=_bounce_screen(t*4.5)
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lx0,lx1=lx0_,lx1_
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ly0,ly1=ly0_,ly1_
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]]--
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end
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was_down=false
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last_mx,last_my=nil,nil
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function update_line()
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local mx,my=stat(32),stat(33)
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local is_down=stat(34)!=0
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if is_down then
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if was_down then
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lx1,ly1=mx,my
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else
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lx0,ly0=mx,my
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end
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end
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was_down=is_down
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last_mx,last_my=mx,my
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end
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-->8
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function _draw()
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cls(0)
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rect(bx0,by0,bx1,by1,6)
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--quickzot(lx1,ly1,2,lx1-lx0,ly1-ly0,10,9,8)
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linefill(lx0, ly0, lx1, ly1, 2, 9)
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line(lx0,ly0,lx1,ly1,2)
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local cmin, cmax = collides()
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if cmin then
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local dx,dy=lx1-lx0,ly1-ly0
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line(lx0 + dx*cmin,
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ly0 + dy*cmin,
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lx0 + dx*cmax,
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ly0 + dy*cmax,
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11)
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pset(lx0 + dx*cmin,
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ly0 + dy*cmin,
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12)
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end
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pset(last_mx,last_my,7)
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end
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-->8
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function zot_one(x, y, r, ir, dx, dy, hot, warm)
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local x0, y0 = x-dx, y-dy
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local rx,ry,irx,iry=r*sgn(dx),r*sgn(dy),ir*sgn(dx),ir*sgn(dy)
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if warm then
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line(x0+irx,y0-ry,x+rx,y-iry,warm)
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line(x0-rx,y0+iry,x-irx,y+ry,warm)
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--line(x0-rx,y0-ry,x+rx,y+ry,warm)
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end
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line(x0,y0,x+rx,y-iry,hot)
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line(x0,y0,x-irx,y+ry,hot)
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--line(x0,y0,x+rx,y+ry,hot)
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end
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function zot(x,y,r,dx,dy,hot,warm,cold)
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local x0,y0,sdx,sdy=x-dx,y-dy,sgn(dx),sgn(dy)
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local rx,ry=r*sdx,r*sdy
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if cold then
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rectfill(x0-rx,y0-ry,x0+rx,y0+ry,cold)
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local sdxh,sdyh=sdx/2,sdy/2
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line(x0-rx-sdxh,y0+ry+sdyh,x-rx,y+ry,cold)
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line(x0+rx+sdxh,y0-ry-sdyh,x+rx,y-ry,cold)
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end
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for i=-r,r do
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line(x0+i*sdx,y0-ry,x+rx,y-i*sdy,warm)
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line(x0-rx,y0+i*sdy,x-i*sdx,y+ry,warm)
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end
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for i=-r,r do
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line(x0,y0,x+rx,y-i*sdy,hot)
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line(x0,y0,x-i*sdx,y+ry,hot)
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end
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end
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function quickzot(x,y,r,dx,dy,hot,warm,cold)
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local x0, y0, r2 = x-dx, y-dy, r/2
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rectfill(x0-0.5-r2, y0-0.5-r2, x0+r2+0.5, y0+r2+0.5, cold)
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local a = atan2(dx,dy)-0.25
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local tdx,tdy=cos(a), sin(a)
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for i=-r*0.65,r*0.65,0.65 do
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line(x0+i*tdx, y0+i*tdy, x+i*tdx, y+i*tdy, warm)
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end
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rectfill(x-r2,y-r2,x+r2,y+r2,hot)
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end
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-- linefill x0 y0 x1 y1 r [col]
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-- draw a thicc line
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-- https://www.lexaloffle.com/bbs/?tid=39016
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function linefill(ax,ay,bx,by,r,c)
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if(c) color(c)
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local dx,dy=bx-ax,by-ay
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||||
-- avoid overflow
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||||
-- credits: https://www.lexaloffle.com/bbs/?tid=28999
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local d,n = abs(dx),abs(dy)
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if (d<n) d,n=n,d
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n/=d
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d*=sqrt(n*n+1)
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if(d<0.001) return
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local ca,sa=dx/d,-dy/d
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-- polygon points
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local s={
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{0,-r},{d,-r},{d,r},{0,r}
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}
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local u,v,spans=s[4][1],s[4][2],{}
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local x0,y0=ax+u*ca+v*sa,ay-u*sa+v*ca
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for i=1,4 do
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local u,v=unpack(s[i])
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local x1,y1=ax+u*ca+v*sa,ay-u*sa+v*ca
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local _x1,_y1=x1,y1
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if(y0>y1) x0,y0,x1,y1=x1,y1,x0,y0
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local dx=(x1-x0)/(y1-y0)
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if(y0<0) x0-=y0*dx y0=-1
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local cy0=y0\1+1
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-- sub-pix shift
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x0+=(cy0-y0)*dx
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for y=y0\1+1,min(y1\1,127) do
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-- open span?
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local span=spans[y]
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if span then
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rectfill(x0,y,span,y)
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else
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spans[y]=x0
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end
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x0+=dx
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end
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x0,y0=_x1,_y1
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end
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||||
end
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__gfx__
|
||||
00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
|
||||
00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
|
||||
00700700000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
|
||||
00077000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
|
||||
00077000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
|
||||
00700700000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
|
||||
245
magnitest.p8
Normal file
245
magnitest.p8
Normal file
@ -0,0 +1,245 @@
|
||||
pico-8 cartridge // http://www.pico-8.com
|
||||
version 42
|
||||
__lua__
|
||||
--magnitest.p8
|
||||
--accuracy and perf tests for
|
||||
--vector calculation logic
|
||||
|
||||
-- profiler says 67 cycles
|
||||
-- 39 lua, 28 system
|
||||
function bbs28999alg(dx, dy)
|
||||
local d = max(abs(dx),abs(dy))
|
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local n = min(abs(dx),abs(dy)) / d
|
||||
return sqrt(n*n + 1) * d
|
||||
end
|
||||
|
||||
-- profiler says 56 cycles
|
||||
-- 24 lua, 32 system
|
||||
function bbs28999algopt(dx, dy)
|
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local d,n=abs(dx),abs(dy)
|
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if (d<n) d,n=n,d
|
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n/=d
|
||||
return (n*n + 1)^0.5 * d
|
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end
|
||||
|
||||
-- profiler says 54 cycles
|
||||
-- 26 lua, 28 system
|
||||
function bbs28999algopt2(dx, dy)
|
||||
local d,n=abs(dx),abs(dy)
|
||||
if (d<n) d,n=n,d
|
||||
n/=d
|
||||
return sqrt(n*n + 1) * d
|
||||
end
|
||||
|
||||
|
||||
-- profiler says 18 cycles
|
||||
-- 18 lua, 0 system
|
||||
function trigalg(dx, dy)
|
||||
local s = sin(atan2(dx,dy))
|
||||
if (s==0) return abs(dx)
|
||||
return abs(dy/s)
|
||||
end
|
||||
-->8
|
||||
function _init()
|
||||
gdx,gdy=0,0
|
||||
acc=1
|
||||
magnitude = 1
|
||||
tresult=0
|
||||
bresult=0
|
||||
delta=0
|
||||
dp=0
|
||||
end
|
||||
|
||||
function _update60()
|
||||
if (btn(0)) gdx -= acc
|
||||
if (btn(1)) gdx += acc
|
||||
if (btn(2)) gdy -= acc
|
||||
if (btn(3)) gdy += acc
|
||||
if (btn(4) and btn(5)) gdx,gdy=0,0
|
||||
gdx=mid(-16000,16000,gdx)
|
||||
gdy=mid(-16000,16000,gdy)
|
||||
|
||||
if btn() == 0 or btn(4) then
|
||||
acc = 1
|
||||
elseif btn(5) then
|
||||
acc *= 1.05
|
||||
else
|
||||
acc *= 1.02
|
||||
end
|
||||
if (acc > 1024) acc=1024
|
||||
|
||||
local a,b=abs(gdx),abs(gdy)
|
||||
if (b>a) a,b=b,a
|
||||
magnitude = 1
|
||||
while magnitude < a/64 do
|
||||
magnitude *= 2
|
||||
end
|
||||
|
||||
bresult=bbs28999algopt2(gdx,gdy)
|
||||
tresult=trigalg(gdx,gdy)
|
||||
delta=tresult-bresult
|
||||
dp=(2*abs(delta)/abs(abs(bresult)+abs(tresult)))*100
|
||||
if (delta == 0) dp=0
|
||||
end
|
||||
|
||||
cols = {
|
||||
6,7,
|
||||
[4]=10,
|
||||
[8]=9,
|
||||
[16]=4,
|
||||
[32]=14,
|
||||
[64]=15,
|
||||
[128]=11,
|
||||
[256]=12,
|
||||
[512]=13,
|
||||
[1024]=8,
|
||||
}
|
||||
|
||||
function _draw()
|
||||
cls()
|
||||
camera()
|
||||
print("x: "..tostr(gdx).." y: "..tostr(gdy).."\nbase: "..tostr(bresult).."\ntrig: "..tostr(tresult).."\n\ndiff: "..tostr(delta).."\n %:"..tostr(dp),0,0,13)
|
||||
print("⬆️⬇️⬅️➡️:move ❎:fast 🅾️:slow\n❎+🅾️:reset position",0,117,12)
|
||||
camera(-63,-63)
|
||||
line(0,0,gdx/magnitude,gdy/magnitude,cols[magnitude] or 2)
|
||||
rectfill(0,0,gdx/magnitude,0,5)
|
||||
rectfill(0,0,0,gdy/magnitude,5)
|
||||
end
|
||||
|
||||
__gfx__
|
||||
00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
|
||||
00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
|
||||
00700700000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
|
||||
00077000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
|
||||
00077000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
|
||||
00700700000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
|
||||
__label__
|
||||
d0d000000000ddd0ddd0ddd0d0d00000ddd0d0d0ddd0ddd000000000d0d0000000000000dd00dd00ddd0ddd00000ddd0ddd0ddd0ddd000000000000000000000
|
||||
d0d00d00000000d000d0d000d0d00000d0d0d0d000d000d000000000d0d00d00000000000d000d0000d0d0000000d0d0d000d000d00000000000000000000000
|
||||
0d00000000000dd000d0ddd0ddd00000d0d0ddd0ddd000d000000000ddd000000000ddd00d000d00ddd0ddd00000ddd0ddd0ddd0ddd000000000000000000000
|
||||
d0d00d00000000d000d000d000d00000d0d000d0d00000d00000000000d00d00000000000d000d00d00000d00000d0d000d000d000d000000000000000000000
|
||||
d0d000000000ddd000d0ddd000d00d00ddd000d0ddd000d000000000ddd0000000000000ddd0ddd0ddd0ddd00d00ddd0ddd0ddd0ddd000000000000000000000
|
||||
00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
|
||||
ddd0ddd00dd0ddd000000000ddd0ddd0dd00ddd00000dd00ddd0ddd0dd0000000000000000000000000000000000000000000000000000000000000000000000
|
||||
d0d0d0d0d000d0000d00000000d0d0d00d00d0d000000d00d0d000d00d0000000000000000000000000000000000000000000000000000000000000000000000
|
||||
dd00ddd0ddd0dd00000000000dd0ddd00d00ddd000000d00ddd000d00d0000000000000000000000000000000000000000000000000000000000000000000000
|
||||
d0d0d0d000d0d0000d00000000d000d00d0000d000000d00d0d000d00d0000000000000000000000000000000000000000000000000000000000000000000000
|
||||
ddd0d0d0dd00ddd000000000ddd000d0ddd000d00d00ddd0ddd000d0ddd000000000000000000000000000000000000000000000000000000000000000000000
|
||||
00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
|
||||
ddd0ddd0ddd00dd000000000ddd0ddd0dd00ddd00000ddd0dd00ddd0ddd000000000000000000000000000000000000000000000000000000000000000000000
|
||||
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0ccccc0000000ccccc000000c0c0ccc0cc00ccc00c000000c000cc00cc00ccc00c00ccc0cc00c0c0000000000000000000000000000000000000000000000000
|
||||
|
||||
BIN
magnitest.p8.png
Normal file
BIN
magnitest.p8.png
Normal file
Binary file not shown.
|
After Width: | Height: | Size: 4.6 KiB |
501
profiling.p8
Normal file
501
profiling.p8
Normal file
@ -0,0 +1,501 @@
|
||||
pico-8 cartridge // http://www.pico-8.com
|
||||
version 42
|
||||
__lua__
|
||||
-- prof: cpu cycle counter v1.4
|
||||
-- BY PANCELOR
|
||||
--[[------------------------
|
||||
|
||||
|
||||
use this cart to precisely
|
||||
measure code execution time
|
||||
|
||||
--------------------------------
|
||||
★ overview ★
|
||||
--------------------------------
|
||||
| tab 0 | usage guide |
|
||||
| tab 1 | (internals) |
|
||||
| tab 2 | your code here |
|
||||
--------------------------------
|
||||
|
||||
|
||||
-----------------------
|
||||
-- ★ usage guide ★ --
|
||||
-----------------------
|
||||
|
||||
|
||||
웃: i have two code snippets;
|
||||
which one is faster?
|
||||
|
||||
🐱: edit the last tab with your
|
||||
snippets, then run the cart.
|
||||
it will tell you precisely
|
||||
how much cpu it takes to
|
||||
run each snippet.
|
||||
|
||||
the results are also copied
|
||||
to your clipboard.
|
||||
|
||||
|
||||
|
||||
웃: what do the numbers mean?
|
||||
|
||||
🐱: the cpu cost is reported
|
||||
as lua and system cycle
|
||||
counts. look up stat(1)
|
||||
and stat(2) for more info.
|
||||
|
||||
if you're not sure, just
|
||||
look at the first number.
|
||||
lower is faster (better)
|
||||
|
||||
|
||||
|
||||
웃: why "{locals={9}}"
|
||||
in the example?
|
||||
|
||||
🐱: accessing local variables
|
||||
is faster than global vars.
|
||||
|
||||
so if your test involves
|
||||
local variables, simulate
|
||||
this by passing them in:
|
||||
|
||||
prof(function(a)
|
||||
sqrt(a)
|
||||
end,{ locals={9} })
|
||||
|
||||
/!\ /!\ /!\ /!\
|
||||
local values from outside
|
||||
the current scope are also
|
||||
slower to access! example:
|
||||
|
||||
global = 4
|
||||
local outer = 4
|
||||
prof(function(x)
|
||||
local _ = x --fast
|
||||
end,function(x)
|
||||
local _ = outer --slow
|
||||
end,function(x)
|
||||
local _ = global --slow
|
||||
end,{ locals={4} })
|
||||
/!\ /!\ /!\ /!\
|
||||
|
||||
|
||||
|
||||
웃: can i do "prof(myfunc)"?
|
||||
|
||||
🐱: no, this sometimes gives
|
||||
wrong results! always use
|
||||
inline functions:
|
||||
|
||||
prof(function()
|
||||
--code for myfunc here
|
||||
end)
|
||||
|
||||
as an example, "prof(sin)"
|
||||
reports "-2" -- wrong! but
|
||||
"prof(function()sin()end)"
|
||||
correctly reports "4"
|
||||
|
||||
(see the technical notes at
|
||||
the start of the next tab
|
||||
for a brief explanation.
|
||||
technically, "prof(myfunc)"
|
||||
will work if myfunc was made
|
||||
by the user, but you will
|
||||
risk confusing yourself)
|
||||
|
||||
|
||||
|
||||
---------------
|
||||
★ method 2 ★
|
||||
---------------
|
||||
|
||||
|
||||
|
||||
this cart is based on
|
||||
code by samhocevar:
|
||||
https://www.lexaloffle.com/bbs/?pid=60198#p
|
||||
|
||||
if you do this method, be very
|
||||
careful with local/global vars.
|
||||
it's very easy to accidentally
|
||||
measure the wrong thing.
|
||||
|
||||
here's an example of how to
|
||||
measure cycles (ignoring this
|
||||
cart and using the old method)
|
||||
|
||||
function _init()
|
||||
local a=11.2 -- locals
|
||||
|
||||
local n=1024
|
||||
flip()
|
||||
local tot1,sys1=stat(1),stat(2)
|
||||
for i=1,n do end --calibrate
|
||||
local tot2,sys2=stat(1),stat(2)
|
||||
for i=1,n do local _=sqrt(a) end --measure
|
||||
local tot3,sys3=stat(1),stat(2)
|
||||
|
||||
function cyc(t0,t1,t2) return ((t2-t1)-(t1-t0))*128/n*256/stat(8)*256 end
|
||||
local lua = cyc(tot1-sys1,tot2-sys2,tot3-sys3)
|
||||
local sys = cyc(sys1,sys2,sys3)
|
||||
print(lua.."+"..sys.."="..(lua+sys).." (lua+sys)")
|
||||
end
|
||||
|
||||
run this once, see the results,
|
||||
then change the "measure" line
|
||||
to some other code you want
|
||||
to measure.
|
||||
|
||||
note: wrapping the code inside
|
||||
"_init()" is required, otherwise
|
||||
builtin functions like "sin"
|
||||
will be measured wrong.
|
||||
(the reason is explained at
|
||||
the start of the next tab)
|
||||
|
||||
|
||||
|
||||
---------------
|
||||
★ method 3 ★
|
||||
---------------
|
||||
|
||||
|
||||
|
||||
another way to measure cpu cost
|
||||
is to run something like this:
|
||||
|
||||
function _draw()
|
||||
cls(1)
|
||||
local x=9
|
||||
for i=1,1000 do
|
||||
local a=sqrt(x) --snippet1
|
||||
-- local b=x^0.5 --snippet2
|
||||
end
|
||||
end
|
||||
|
||||
while running, press ctrl-p to
|
||||
see the performance monitor.
|
||||
the middle number shows how much
|
||||
of cpu is being used, as a
|
||||
fraction. (0.60 = 60% used)
|
||||
|
||||
now, change the comments on the
|
||||
two code snippets inside _draw()
|
||||
and re-run. compare the new
|
||||
result with the old to determine
|
||||
which snippet is faster.
|
||||
|
||||
note: every loop iteration costs
|
||||
an additional 2 cycles, so the
|
||||
ratio of the two fractions will
|
||||
not match the ratio of the
|
||||
execution time of the snippets.
|
||||
but this method can quickly tell
|
||||
you which snippet is faster.
|
||||
|
||||
|
||||
|
||||
]]
|
||||
|
||||
-->8
|
||||
--[[ profiler.lua
|
||||
more info: https://www.lexaloffle.com/bbs/?tid=46117
|
||||
|
||||
usage:
|
||||
prof(function()
|
||||
memcpy(0,0x200,64)
|
||||
end,function()
|
||||
poke4(0,peek4(0x200,16))
|
||||
end)
|
||||
|
||||
passing locals:
|
||||
prof(
|
||||
function(a,b)
|
||||
local c=(a+1)*(b+1)-1
|
||||
end,
|
||||
function(a,b)
|
||||
local c=a*b+a+b
|
||||
end,
|
||||
{locals={3,5}}
|
||||
)
|
||||
|
||||
getting global/local variables exactly right
|
||||
is very tricky; you should always use inline
|
||||
functions like above; if you try e.g. prof(sin)
|
||||
the results will be wrong.
|
||||
|
||||
|
||||
# minutiae / notes to self:
|
||||
---------------------------
|
||||
doing this at top-level is awkward:
|
||||
for _=1,n do end -- calibrate
|
||||
for _=1,n do sin() end -- measure
|
||||
b/c sin is secretly local at top-level,
|
||||
so it gives a misleading result (3 cycles).
|
||||
do it inside _init instead for a
|
||||
more representative result (4 cycles).
|
||||
|
||||
## separate issue:
|
||||
------------------
|
||||
if you call prof(sin), it gives the wrong result (-2 cycles) because
|
||||
it's comparing sin() against noop() (not truly nothing).
|
||||
but we want the noop() there for normal inline prof() calls,
|
||||
to avoid measuring the cost of the indirection
|
||||
(calling func() from inside prof() is irrelevant to
|
||||
how cpu-expensive func()'s body is)
|
||||
]]
|
||||
|
||||
-- prof(fn1,fn2,...,fnN,[opts])
|
||||
--
|
||||
-- opts.locals: values to pass
|
||||
-- opts.name: text label
|
||||
-- opts.n: number of iterations
|
||||
function prof(...)
|
||||
local funcs={...}
|
||||
local opts=type(funcs[#funcs])=="table" and deli(funcs) or {}
|
||||
|
||||
-- build output string
|
||||
local msg=""
|
||||
local function log(s)
|
||||
msg..=s.."\n"
|
||||
end
|
||||
|
||||
if opts.name then
|
||||
log("prof: "..opts.name)
|
||||
end
|
||||
for fn in all(funcs) do
|
||||
local dat=prof_one(fn,opts)
|
||||
log(sub(" "..dat.total,-3)
|
||||
.." ("
|
||||
..dat.lua
|
||||
.." lua, "
|
||||
..dat.sys
|
||||
.." sys)")
|
||||
end
|
||||
|
||||
-- copy to clipboard
|
||||
printh(msg,"@clip")
|
||||
-- print + pause
|
||||
cls()
|
||||
stop(msg)
|
||||
end
|
||||
|
||||
function prof_one(func, opts)
|
||||
opts = opts or {}
|
||||
local n = opts.n or 0x200 --how many times to call func
|
||||
local locals = opts.locals or {} --locals to pass func
|
||||
|
||||
-- we want to type
|
||||
-- local m = 0x80_0000/n
|
||||
-- but 8MHz is too large to fit in a pico-8 number,
|
||||
-- so we do (0x80_0000>>16)/(n>>16) instead
|
||||
-- (n is always an integer, so n>>16 won't lose any bits)
|
||||
local m = 0x80/(n>>16)
|
||||
assert(0x80/m << 16 == n, "n is too small") -- make sure m didn't overflow
|
||||
local fps = stat(8)
|
||||
|
||||
-- given three timestamps (pre-calibration, middle, post-measurement),
|
||||
-- calculate how many more CPU cycles func() took compared to noop()
|
||||
-- derivation:
|
||||
-- T := ((t2-t1)-(t1-t0))/n (frames)
|
||||
-- this is the extra time for each func call, compared to noop
|
||||
-- this is measured in #-of-frames -- it will be a small fraction for most ops
|
||||
-- F := 1/30 (seconds/frame) (or 1/60 if this test is running at 60fps)
|
||||
-- this is just the framerate that the tests run at, not the framerate of your game
|
||||
-- M := 256*256*128 = 0x80_0000 = 8MHz (cycles/second)
|
||||
-- (PICO-8 runs at 8MHz; see https://www.lexaloffle.com/dl/docs/pico-8_manual.html#CPU)
|
||||
-- cycles := T frames * F seconds/frame * M cycles/second
|
||||
-- optimization / working around pico-8's fixed point numbers:
|
||||
-- T2 := T*n = (t2-t1)-(t1-t0)
|
||||
-- M2 := M/n = (M>>16)/(n>>16) := m (e.g. when n is 0x1000, m is 0x800)
|
||||
-- cycles := T2*M2*F
|
||||
local function cycles(t0,t1,t2)
|
||||
local diff = (t2-t1)-(t1-t0)
|
||||
local e1 = "must use inline functions -- see usage guide"
|
||||
assert(0<=diff,e1)
|
||||
local thresh = 0x7fff.ffff/(m/fps)
|
||||
local e2 = "code is too large or slow -- try profiling manually with stat(1)"
|
||||
assert(diff<=thresh,e2)
|
||||
return diff*(m/fps)
|
||||
end
|
||||
|
||||
local noop = function() end -- this must be local, because func is local
|
||||
flip() --avoid flipping mid-measurement
|
||||
local atot,asys=stat(1),stat(2)
|
||||
for _=1,n do noop(unpack(locals)) end -- calibrate
|
||||
local btot,bsys=stat(1),stat(2)
|
||||
for _=1,n do func(unpack(locals)) end -- measure
|
||||
local ctot,csys=stat(1),stat(2)
|
||||
|
||||
-- gather results
|
||||
local tot=cycles(atot,btot,ctot)
|
||||
local sys=cycles(asys,bsys,csys)
|
||||
return {
|
||||
lua=tot-sys,
|
||||
sys=sys,
|
||||
total=tot,
|
||||
}
|
||||
end
|
||||
|
||||
-->8
|
||||
-- your code here
|
||||
|
||||
--edit me:
|
||||
prof(function(dx,dy)
|
||||
local d = max(abs(dx),abs(dy))
|
||||
local n = min(abs(dx),abs(dy)) / d
|
||||
return sqrt(n*n + 1) * d
|
||||
end,function(dx, dy)
|
||||
local d,n=abs(dx),abs(dy)
|
||||
if (d<n) d,n=n,d
|
||||
n/=d
|
||||
return (n*n + 1)^0.5 * d
|
||||
end,function(dx,dy)
|
||||
local d,n=abs(dx),abs(dy)
|
||||
if (d<n) d,n=n,d
|
||||
n/=d
|
||||
return sqrt(n*n + 1) * d
|
||||
end,function(dx,dy)
|
||||
local s = sin(atan2(dx,dy))
|
||||
if (s==0) return abs(dx)
|
||||
return abs(dy/s)
|
||||
end,{ locals={3,4} })
|
||||
|
||||
-- "locals" (optional) are
|
||||
-- passed in as args. see the
|
||||
-- usage guide for details.
|
||||
|
||||
__label__
|
||||
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|
||||
00006000060000006060666000006000000060006000606060600600600060606000006000000000000000000000000000000000000000000000000000000000
|
||||
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||||
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||||
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||||
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||||
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||||
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||||
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|
||||
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|
||||
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|
||||
|
||||
__sfx__
|
||||
030100003052500505005050050500505005050050500505005050050500505005050050500505005050050500505005050050500505005050050500505005050050500505005050050500505005050050500505
|
||||
1154
vacuum_gambit.p8
1154
vacuum_gambit.p8
File diff suppressed because it is too large
Load Diff
598
zotprofiling.p8
Normal file
598
zotprofiling.p8
Normal file
@ -0,0 +1,598 @@
|
||||
pico-8 cartridge // http://www.pico-8.com
|
||||
version 42
|
||||
__lua__
|
||||
-- prof: cpu cycle counter v1.4
|
||||
-- BY PANCELOR
|
||||
--[[------------------------
|
||||
|
||||
|
||||
use this cart to precisely
|
||||
measure code execution time
|
||||
|
||||
--------------------------------
|
||||
★ overview ★
|
||||
--------------------------------
|
||||
| tab 0 | usage guide |
|
||||
| tab 1 | (internals) |
|
||||
| tab 2 | your code here |
|
||||
--------------------------------
|
||||
|
||||
|
||||
-----------------------
|
||||
-- ★ usage guide ★ --
|
||||
-----------------------
|
||||
|
||||
|
||||
웃: i have two code snippets;
|
||||
which one is faster?
|
||||
|
||||
🐱: edit the last tab with your
|
||||
snippets, then run the cart.
|
||||
it will tell you precisely
|
||||
how much cpu it takes to
|
||||
run each snippet.
|
||||
|
||||
the results are also copied
|
||||
to your clipboard.
|
||||
|
||||
|
||||
|
||||
웃: what do the numbers mean?
|
||||
|
||||
🐱: the cpu cost is reported
|
||||
as lua and system cycle
|
||||
counts. look up stat(1)
|
||||
and stat(2) for more info.
|
||||
|
||||
if you're not sure, just
|
||||
look at the first number.
|
||||
lower is faster (better)
|
||||
|
||||
|
||||
|
||||
웃: why "{locals={9}}"
|
||||
in the example?
|
||||
|
||||
🐱: accessing local variables
|
||||
is faster than global vars.
|
||||
|
||||
so if your test involves
|
||||
local variables, simulate
|
||||
this by passing them in:
|
||||
|
||||
prof(function(a)
|
||||
sqrt(a)
|
||||
end,{ locals={9} })
|
||||
|
||||
/!\ /!\ /!\ /!\
|
||||
local values from outside
|
||||
the current scope are also
|
||||
slower to access! example:
|
||||
|
||||
global = 4
|
||||
local outer = 4
|
||||
prof(function(x)
|
||||
local _ = x --fast
|
||||
end,function(x)
|
||||
local _ = outer --slow
|
||||
end,function(x)
|
||||
local _ = global --slow
|
||||
end,{ locals={4} })
|
||||
/!\ /!\ /!\ /!\
|
||||
|
||||
|
||||
|
||||
웃: can i do "prof(myfunc)"?
|
||||
|
||||
🐱: no, this sometimes gives
|
||||
wrong results! always use
|
||||
inline functions:
|
||||
|
||||
prof(function()
|
||||
--code for myfunc here
|
||||
end)
|
||||
|
||||
as an example, "prof(sin)"
|
||||
reports "-2" -- wrong! but
|
||||
"prof(function()sin()end)"
|
||||
correctly reports "4"
|
||||
|
||||
(see the technical notes at
|
||||
the start of the next tab
|
||||
for a brief explanation.
|
||||
technically, "prof(myfunc)"
|
||||
will work if myfunc was made
|
||||
by the user, but you will
|
||||
risk confusing yourself)
|
||||
|
||||
|
||||
|
||||
---------------
|
||||
★ method 2 ★
|
||||
---------------
|
||||
|
||||
|
||||
|
||||
this cart is based on
|
||||
code by samhocevar:
|
||||
https://www.lexaloffle.com/bbs/?pid=60198#p
|
||||
|
||||
if you do this method, be very
|
||||
careful with local/global vars.
|
||||
it's very easy to accidentally
|
||||
measure the wrong thing.
|
||||
|
||||
here's an example of how to
|
||||
measure cycles (ignoring this
|
||||
cart and using the old method)
|
||||
|
||||
function _init()
|
||||
local a=11.2 -- locals
|
||||
|
||||
local n=1024
|
||||
flip()
|
||||
local tot1,sys1=stat(1),stat(2)
|
||||
for i=1,n do end --calibrate
|
||||
local tot2,sys2=stat(1),stat(2)
|
||||
for i=1,n do local _=sqrt(a) end --measure
|
||||
local tot3,sys3=stat(1),stat(2)
|
||||
|
||||
function cyc(t0,t1,t2) return ((t2-t1)-(t1-t0))*128/n*256/stat(8)*256 end
|
||||
local lua = cyc(tot1-sys1,tot2-sys2,tot3-sys3)
|
||||
local sys = cyc(sys1,sys2,sys3)
|
||||
print(lua.."+"..sys.."="..(lua+sys).." (lua+sys)")
|
||||
end
|
||||
|
||||
run this once, see the results,
|
||||
then change the "measure" line
|
||||
to some other code you want
|
||||
to measure.
|
||||
|
||||
note: wrapping the code inside
|
||||
"_init()" is required, otherwise
|
||||
builtin functions like "sin"
|
||||
will be measured wrong.
|
||||
(the reason is explained at
|
||||
the start of the next tab)
|
||||
|
||||
|
||||
|
||||
---------------
|
||||
★ method 3 ★
|
||||
---------------
|
||||
|
||||
|
||||
|
||||
another way to measure cpu cost
|
||||
is to run something like this:
|
||||
|
||||
function _draw()
|
||||
cls(1)
|
||||
local x=9
|
||||
for i=1,1000 do
|
||||
local a=sqrt(x) --snippet1
|
||||
-- local b=x^0.5 --snippet2
|
||||
end
|
||||
end
|
||||
|
||||
while running, press ctrl-p to
|
||||
see the performance monitor.
|
||||
the middle number shows how much
|
||||
of cpu is being used, as a
|
||||
fraction. (0.60 = 60% used)
|
||||
|
||||
now, change the comments on the
|
||||
two code snippets inside _draw()
|
||||
and re-run. compare the new
|
||||
result with the old to determine
|
||||
which snippet is faster.
|
||||
|
||||
note: every loop iteration costs
|
||||
an additional 2 cycles, so the
|
||||
ratio of the two fractions will
|
||||
not match the ratio of the
|
||||
execution time of the snippets.
|
||||
but this method can quickly tell
|
||||
you which snippet is faster.
|
||||
|
||||
|
||||
|
||||
]]
|
||||
|
||||
-->8
|
||||
--[[ profiler.lua
|
||||
more info: https://www.lexaloffle.com/bbs/?tid=46117
|
||||
|
||||
usage:
|
||||
prof(function()
|
||||
memcpy(0,0x200,64)
|
||||
end,function()
|
||||
poke4(0,peek4(0x200,16))
|
||||
end)
|
||||
|
||||
passing locals:
|
||||
prof(
|
||||
function(a,b)
|
||||
local c=(a+1)*(b+1)-1
|
||||
end,
|
||||
function(a,b)
|
||||
local c=a*b+a+b
|
||||
end,
|
||||
{locals={3,5}}
|
||||
)
|
||||
|
||||
getting global/local variables exactly right
|
||||
is very tricky; you should always use inline
|
||||
functions like above; if you try e.g. prof(sin)
|
||||
the results will be wrong.
|
||||
|
||||
|
||||
# minutiae / notes to self:
|
||||
---------------------------
|
||||
doing this at top-level is awkward:
|
||||
for _=1,n do end -- calibrate
|
||||
for _=1,n do sin() end -- measure
|
||||
b/c sin is secretly local at top-level,
|
||||
so it gives a misleading result (3 cycles).
|
||||
do it inside _init instead for a
|
||||
more representative result (4 cycles).
|
||||
|
||||
## separate issue:
|
||||
------------------
|
||||
if you call prof(sin), it gives the wrong result (-2 cycles) because
|
||||
it's comparing sin() against noop() (not truly nothing).
|
||||
but we want the noop() there for normal inline prof() calls,
|
||||
to avoid measuring the cost of the indirection
|
||||
(calling func() from inside prof() is irrelevant to
|
||||
how cpu-expensive func()'s body is)
|
||||
]]
|
||||
|
||||
-- prof(fn1,fn2,...,fnN,[opts])
|
||||
--
|
||||
-- opts.locals: values to pass
|
||||
-- opts.name: text label
|
||||
-- opts.n: number of iterations
|
||||
function prof(...)
|
||||
cls()
|
||||
local funcs={...}
|
||||
local opts=type(funcs[#funcs])=="table" and deli(funcs) or {}
|
||||
|
||||
-- build output string
|
||||
local msg=""
|
||||
local function log(s)
|
||||
msg..=s.."\n"
|
||||
end
|
||||
|
||||
if opts.name then
|
||||
log("prof: "..opts.name)
|
||||
end
|
||||
for fn in all(funcs) do
|
||||
local dat=prof_one(fn,opts)
|
||||
log(sub(" "..dat.total,-3)
|
||||
.." ("
|
||||
..dat.lua
|
||||
.." lua, "
|
||||
..dat.sys
|
||||
.." sys)")
|
||||
end
|
||||
|
||||
-- copy to clipboard
|
||||
printh(msg,"@clip")
|
||||
-- print + pause
|
||||
while btn() == 0 do
|
||||
flip()
|
||||
end
|
||||
color(6)
|
||||
stop(msg)
|
||||
end
|
||||
|
||||
function prof_one(func, opts)
|
||||
opts = opts or {}
|
||||
local n = opts.n or 0x200 --how many times to call func
|
||||
local locals = opts.locals or {} --locals to pass func
|
||||
|
||||
-- we want to type
|
||||
-- local m = 0x80_0000/n
|
||||
-- but 8MHz is too large to fit in a pico-8 number,
|
||||
-- so we do (0x80_0000>>16)/(n>>16) instead
|
||||
-- (n is always an integer, so n>>16 won't lose any bits)
|
||||
local m = 0x80/(n>>16)
|
||||
assert(0x80/m << 16 == n, "n is too small") -- make sure m didn't overflow
|
||||
local fps = stat(8)
|
||||
|
||||
-- given three timestamps (pre-calibration, middle, post-measurement),
|
||||
-- calculate how many more CPU cycles func() took compared to noop()
|
||||
-- derivation:
|
||||
-- T := ((t2-t1)-(t1-t0))/n (frames)
|
||||
-- this is the extra time for each func call, compared to noop
|
||||
-- this is measured in #-of-frames -- it will be a small fraction for most ops
|
||||
-- F := 1/30 (seconds/frame) (or 1/60 if this test is running at 60fps)
|
||||
-- this is just the framerate that the tests run at, not the framerate of your game
|
||||
-- M := 256*256*128 = 0x80_0000 = 8MHz (cycles/second)
|
||||
-- (PICO-8 runs at 8MHz; see https://www.lexaloffle.com/dl/docs/pico-8_manual.html#CPU)
|
||||
-- cycles := T frames * F seconds/frame * M cycles/second
|
||||
-- optimization / working around pico-8's fixed point numbers:
|
||||
-- T2 := T*n = (t2-t1)-(t1-t0)
|
||||
-- M2 := M/n = (M>>16)/(n>>16) := m (e.g. when n is 0x1000, m is 0x800)
|
||||
-- cycles := T2*M2*F
|
||||
local function cycles(t0,t1,t2)
|
||||
local diff = (t2-t1)-(t1-t0)
|
||||
local e1 = "must use inline functions -- see usage guide"
|
||||
assert(0<=diff,e1)
|
||||
local thresh = 0x7fff.ffff/(m/fps)
|
||||
local e2 = "code is too large or slow -- try profiling manually with stat(1)"
|
||||
assert(diff<=thresh,e2)
|
||||
return diff*(m/fps)
|
||||
end
|
||||
|
||||
local noop = function() end -- this must be local, because func is local
|
||||
flip() --avoid flipping mid-measurement
|
||||
local atot,asys=stat(1),stat(2)
|
||||
for _=1,n do noop(unpack(locals)) end -- calibrate
|
||||
local btot,bsys=stat(1),stat(2)
|
||||
for _=1,n do func(unpack(locals)) end -- measure
|
||||
local ctot,csys=stat(1),stat(2)
|
||||
|
||||
-- gather results
|
||||
local tot=cycles(atot,btot,ctot)
|
||||
local sys=cycles(asys,bsys,csys)
|
||||
return {
|
||||
lua=tot-sys,
|
||||
sys=sys,
|
||||
total=tot,
|
||||
}
|
||||
end
|
||||
|
||||
-->8
|
||||
-- your code here
|
||||
|
||||
--edit me:
|
||||
|
||||
function linefill(ax,ay,dx,dy,r,c)
|
||||
if(c) color(c)
|
||||
-- avoid overflow
|
||||
-- credits: https://www.lexaloffle.com/bbs/?tid=28999
|
||||
local d,n = abs(dx),abs(dy)
|
||||
if (d<n) d,n=n,d
|
||||
n/=d
|
||||
d*=sqrt(n*n+1)
|
||||
if(d<0.001) return
|
||||
local ca,sa=dx/d,-dy/d
|
||||
|
||||
-- polygon points
|
||||
local s={
|
||||
{0,-r},{d,-r},{d,r},{0,r}
|
||||
}
|
||||
local u,v,spans=s[4][1],s[4][2],{}
|
||||
local x0,y0=ax+u*ca+v*sa,ay-u*sa+v*ca
|
||||
for i=1,4 do
|
||||
local u,v=unpack(s[i])
|
||||
local x1,y1=ax+u*ca+v*sa,ay-u*sa+v*ca
|
||||
local _x1,_y1=x1,y1
|
||||
if(y0>y1) x0,y0,x1,y1=x1,y1,x0,y0
|
||||
local dx=(x1-x0)/(y1-y0)
|
||||
if(y0<0) x0-=y0*dx y0=-1
|
||||
local cy0=y0\1+1
|
||||
-- sub-pix shift
|
||||
x0+=(cy0-y0)*dx
|
||||
for y=y0\1+1,min(y1\1,127) do
|
||||
-- open span?
|
||||
local span=spans[y]
|
||||
if span then
|
||||
rectfill(x0,y,span,y)
|
||||
else
|
||||
spans[y]=x0
|
||||
end
|
||||
x0+=dx
|
||||
end
|
||||
x0,y0=_x1,_y1
|
||||
end
|
||||
end
|
||||
|
||||
function quickzot(x,y,r,dx,dy,hot,warm,cold)
|
||||
local x0, y0, r2 = x-dx, y-dy, r/2
|
||||
rectfill(x0-0.5-r2, y0-0.5-r2, x0+r2+0.5, y0+r2+0.5, cold)
|
||||
local a = atan2(dx,dy)-0.25
|
||||
local tdx,tdy=cos(a), sin(a)
|
||||
for i=-r*0.65,r*0.65,0.65 do
|
||||
line(x0+i*tdx, y0+i*tdy, x+i*tdx, y+i*tdy, warm)
|
||||
end
|
||||
rectfill(x-r2,y-r2,x+r2,y+r2,hot)
|
||||
end
|
||||
|
||||
function zot(x,y,r,dx,dy,hot,warm,cold)
|
||||
local x0,y0,sdx,sdy=x-dx,y-dy,sgn(dx),sgn(dy)
|
||||
local rx,ry=r*sdx,r*sdy
|
||||
if cold then
|
||||
rectfill(x0-rx,y0-ry,x0+rx,y0+ry,cold)
|
||||
local sdxh,sdyh=sdx/2,sdy/2
|
||||
line(x0-rx-sdxh,y0+ry+sdyh,x-rx,y+ry,cold)
|
||||
line(x0+rx+sdxh,y0-ry-sdyh,x+rx,y-ry,cold)
|
||||
end
|
||||
for i=-r,r do
|
||||
line(x0+i*sdx,y0-ry,x+rx,y-i*sdy,warm)
|
||||
line(x0-rx,y0+i*sdy,x-i*sdx,y+ry,warm)
|
||||
end
|
||||
for i=-r,r do
|
||||
line(x0,y0,x+rx,y-i*sdy,hot)
|
||||
line(x0,y0,x-i*sdx,y+ry,hot)
|
||||
end
|
||||
end
|
||||
|
||||
function respr(x,y,dx,dy,r,s)
|
||||
if (r==0) r=0.5
|
||||
local n=ceil(max(abs(dx),abs(dy))/r/2)
|
||||
local d1x,d1y=dx/n,dy/n
|
||||
r/=4
|
||||
for i=1,n do
|
||||
spr(s,x,y,r,r)
|
||||
x+=d1x
|
||||
y+=d1y
|
||||
end
|
||||
pal()
|
||||
spr(s,x,y,r,r)
|
||||
end
|
||||
|
||||
darkpal = {
|
||||
[7]=4,
|
||||
[9]=2,
|
||||
[10]=4,
|
||||
[8]=2
|
||||
}
|
||||
|
||||
prof(function(dx, dy, r)
|
||||
linefill(32,32,dx,dy,r,10)
|
||||
end,function(dx, dy, r)
|
||||
quickzot(96,32,r,dx,dy,10,9,8)
|
||||
end,function(dx,dy,r)
|
||||
zot(32,96,r,dx,dy,10,9,8)
|
||||
end,function(dx,dy,r)
|
||||
pal(darkpal)
|
||||
respr(96,96,dx,dy,r,r)
|
||||
end,{ locals={4,-9,2} })
|
||||
|
||||
-- "locals" (optional) are
|
||||
-- passed in as args. see the
|
||||
-- usage guide for details.
|
||||
|
||||
__gfx__
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__sfx__
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|
||||
Reference in New Issue
Block a user