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Re: Sprite animation with SDL_perl

by IlyaM (Parson)
on May 05, 2002 at 14:29 UTC ( #164129=note: print w/replies, xml ) Need Help??


in reply to Sprite animation with SDL_perl

Devel::Dprof is your friend

--
Ilya Martynov (http://martynov.org/)

Replies are listed 'Best First'.
Re: Re: Sprite animation with SDL_perl
by Mirage (Sexton) on May 05, 2002 at 14:51 UTC
    Well thanks, however, the module is able to tell me which parts of code take what time, but if you look at the code you may notice that besides from using oop, I also don't use threads, which may give some speed improvements. Mainly I wonder how these games were made in the old days, where cumputers were slow, and threads were unknown.
      How where they made in the old days?
      • Assembler
      • C
      • Look up tables for almost anything other than an addition or subtraction
      • Tweaked graphic modes so you code write to all 4 planes of a VGA card so you could write 4 pixels at a time for scaling and filling.
      • Everthing based on a a pow of 2.
      • Virtually all multiplications and divisions could then be bit-shifted instead of an actual multiplication.
      • If you needed more than int precision you used fixedpoint math.
      • 2D games usually used bit-masks so you could do cheap collision tests using bitwise operators.
      • Self modifying code to cut down on the codesize (usually less than 64K to work with)


      -Lee

      "To be civilized is to deny one's nature."
      Threads cannot make program run faster unless your computer has more than one CPU because on systems with single CPU no matter if you use threads or not your program cannot force CPU to run faster. Carefuly written event based program can actually beat threads based program because they avoid system's overhead for using threads.

      Try to search google for 'Threads vs Events'. You may find some interesting reading on this topic.

      --
      Ilya Martynov (http://martynov.org/)

      I haven't played with it yet myself, but Event might just be of some use to you.

      jeffa

      L-LL-L--L-LL-L--L-LL-L--
      -R--R-RR-R--R-RR-R--R-RR
      B--B--B--B--B--B--B--B--
      H---H---H---H---H---H---
      (the triplet paradiddle with high-hat)
      

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