On Saturday 04 August 2012 00:32:41 wahono sri wrote: > About performance SDL versus SFML, there are interesting discussion in > http://en.sfml-dev.org/forums/index.php?topic=43.0. > SFML>SDL, I'm surprised! > Hnefi: " Your benchmarks are severly flawed. You are comparing the software, 2D library that ships with SDL to OpenGL. Of course you are going to get a huge difference in performance - you don't even need to perform a benchmark to understand that.
What would be really interesting is to see how an SDL-driven OpenGL application performs compared to SFML. That would be a meaningful test, for two reasons: it compares similar technologies and it benchmarks against SDL the way SDL is almost always used. " Laurent: " It wouldn't make sense. SFML is using OpenGL, so any direct OpenGL code will be slightly faster than SFML (unless it's really not optimized), because SFML will always be more generic than your specific code, and genericity has a cost (less optimizations are possible). Basically, the main goal of using raw OpenGL over SFML is to get better performances. " Jonny D: " [...] I made a couple of changes and added two tests. You only tested per-surface alpha-blending, so I added a test for per-pixel alpha (it uses SDL_image now). You also made a couple of no-no's in the rotation and dynamic text tests by creating surfaces within the loop (allocating and freeing tons of memory per second). I changed the rotation test to use SGE's direct rotations (and made it work correctly) and I plugged in NFont so that I could cache the font, rather than generate each glyph when needed. These represent more truly the way that people actually use SDL and its supporting libs for speed. So, Test 2 is not very indicative of typical usage, and Test 6 should be thrown right out. One note: Test 7 uses only Normal font style, since NFont doesn't load the character width correctly for others. [...] 1/ Test : sprites SDL displayed 47 frames SFML displayed 51 frames --> SFML is 1.09x as fast as SDL 2/ Test : alpha-blended sprites SDL displayed 38 frames SFML displayed 52 frames --> SFML is 1.37x as fast as SDL 3/ Test : per-pixel alpha-blended sprites SDL displayed 42 frames SFML displayed 47 frames --> SFML is 1.12x as fast as SDL 4/ Test : rotating sprites SDL displayed 26 frames SFML displayed 26 frames --> SFML is 1.00x as fast as SDL 5/ Test : static text SDL displayed 1382 frames SFML displayed 1023 frames --> SFML is 0.74x as fast as SDL 6/ Test : dynamic text SDL displayed 194 frames SFML displayed 727 frames --> SFML is 3.75x as fast as SDL 7/ Test : dynamic text w/NFont SDL displayed 779 frames SFML displayed 1113 frames --> SFML is 1.43x as fast as SDL " Martin ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ mseide-msegui-talk mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/mseide-msegui-talk
