pouët.net

Kuemmel information 1167 glöps

• general:
• level: user
• personal:
• first name: Michael
• last name: Kübel
• cdcs:
• cdc #1: Puls by Řrřola [web]
• cdc #2: Megapole by Red Sector Inc. [web]
• cdc #3: sp04 - Hello, Kevin - A Dental Journey by Spacepigs [web]
• cdc #4: 0b5vr GLSL Techno Live Set by 0b5vr
• cdc #5: vestige by erpholia

• 256b MS-Dos Space Fungus by Frigo
• To speed things up even more using the out-of-order capabilities and the multiple instruction ports of those modern CPU's I made a version with an inner loop that calculates location x and x+1 at the same time, so that there are no directly dependant instructions.
  Before:
  
  Code:kaliset_loop: movaps xmm2,xmm0 ;d = old p dpps xmm2,xmm2,01111111b ;d = dot(p,p) of first 3 floats and put result in all 4 floats andps xmm0,xmm7 ;p = abs(p) by mask rcpps xmm2,xmm2 ;reverse div+multiply is faster than divps, accuracy seems okay mulps xmm0,xmm2 ;p = abs(p)/dot(p,p) dec bx ;reordered, may be saves some cycles subps xmm0,xmm6 ;p = abs(p)/dot(p,p)-(1,1,0.1)*m addps xmm1,xmm0 ;c+=p jnz kaliset_loop
  
  
  After:
  
  Code:kaliset_loop: movaps xmm2,xmm0 ;d1 = old p1 movaps xmm5,xmm3 ;d2 = old p2 dpps xmm2,xmm2,01111111b ;d1 = dot(p1,p1) of first 3 floats and put result in all 4 floats andps xmm0,xmm7 ;abs(p1) dpps xmm5,xmm5,01111111b ;d2 = dot(p2,p2) andps xmm3,xmm7 ;abs(p2) rcpps xmm2,xmm2 ;reverse div+multiply is faster than divps, accuracy seems okay dec bx ;reordered, may be saves some cycles rcpps xmm5,xmm5 mulps xmm0,xmm2 ;p1 = abs(p1)/dot(p1,p1) mulps xmm3,xmm5 ;p2 = abs(p2)/dot(p2,p2) subps xmm0,xmm6 ;p1 = abs(p1)/dot(p1,p1)-(1,1,0.1)*m subps xmm3,xmm6 ;p2 = abs(p2)/dot(p2,p2)-(1,1,0.1)*m addps xmm1,xmm0 ;c1+=p1 addps xmm4,xmm3 ;c2+=p2 jnz kaliset_loop
  
  
  ...just takes a lot of bytes...now back at around 279 bytes due to the x+1 preparation and additional bytes for plotting. We can save if we use divps instead rcpps/mulps and reach almost 256 without esc/textmode.
  
  But hey...speed is up from 13 FPS to 23 FPS (!) between those two SSE variants. So more than 4 times the fpu version. Link to the code is here. I guess those kind of lengthy speedcode optimizations would be more usefull for a 512 Byter :-)
• isokadded on the 2019-09-22 23:42:53
• 256b MS-Dos Space Fungus by Frigo
• Nice choice of a Kali-set, Frigo :-)
  
  When I was looking through your well commented source code and the shader code, I was thinking to myself that those kind of algoritms just 'cry' for an SSE implementation for speed and may be even size...
  
  ...so to revisit my SSE knowledge I coded an SSE version of your intro. It requires SSE level 4.1 CPU's and assembles with FlatAssembler. You can find it for download here.
  
  Even with ESC/textmode support I'm down to 244 Bytes and a huge speed bonus. Your version would run on my laptop at around 5 FPS, the SSE version is around 13 FPS :-)
  
  So in special code cases SSE can be benefitial for 256 Byte intros :-)
• rulezadded on the 2019-09-20 22:26:54
• wild Animation/Video Who The Fun Is Bill Gates 4 by CaPaNÑa [web]
• Great idea...lets all not shave until April 2020 and we will look like that next Revision anyway and can do a real photo there :-)
• rulezadded on the 2019-09-16 19:28:07
• 256b MS-Dos DORIAN IS COMING by Astroidea [web]
• Nice idea...general midi is your friend :-) ...as Hellmood said I also guess it's doable in 128 Byte...
• rulezadded on the 2019-09-16 17:28:09
• 256b MS-Dos Sakura 桜 by Řrřola [web]
• I think as screen clearing at first isn't needed you could save 2 Bytes in the beginning with this hack from Hellmood that he told me once:
  
  Code:sub al,-(0x13+0x80) ;no screen clearing and provides address by code itself mov gs,word[si] ;results in 0x6d2c which seems to work...
• isokadded on the 2019-09-16 14:23:59
• wild Animation/Video Demoscene tutorial by Nagz [web]
• ...should be on wikipedia for the newbies
• rulezadded on the 2019-09-15 17:32:09
• 256b MS-Dos Sakura 桜 by Řrřola [web]
• random particle cherry blossoming, very nice...though a bit square at the blossom area ;-)
• rulezadded on the 2019-09-15 15:40:46
• 64b MS-Dos into war 64b by Desire [web]
• Apocalypse Now in 64 Byte !
• rulezadded on the 2019-09-15 15:35:50
• demo Windows PILEDRIVER by Ümlaüt Design [web]
• ...really nice paced collage and cool music...just didn't like the rap part :-p
• rulezadded on the 2019-09-15 11:06:35
• 128b MS-Dos the curious old one by Sensenstahl
• ...for the blinking ;-)
• rulezadded on the 2019-09-15 11:04:26