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Bitmap Fonts Question

Started by DaZ Jan 17, 2003 at 4:25 AM 4 replies 250+ views

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Jan 17, 2003 at 4:25 AM

Hi, Using the Particle Engine code from the NeHe site (god bless u Nehe!) I added a Frames per second counter and displayed it as a bitmap font (also using the bitmap font tutorial). I noticed that when I have the Bitmap font displayed on the screen the framerate is roughly half that of when it is just displaying the particles (about 100 of em). I thought it might just be this crappy video card im using, but I tried it on my GF3 at home and its still the same! Particles - 22fps Particles + Text - 12fps! Its weird I know, I didn''t think that using bitmap fonts would give me such a huge performance hit.. I can''t explain why. Its not the code that generates the fonts etc.. cos I can speed it up just by remming out the line that actually draws it on the screen. (glPrint function). Even re-sizing the screen so that the font isn''t displayed will speed it up, then bringing the font back slows it down again.. Would using outline fonts be less of a performance hit?

Jan 17, 2003 at 10:32 AM

I had the same problem...
Use the fonts described in lesson 17. They are quick and look good

Jan 17, 2003 at 10:32 AM

I had the same problem...
Use the fonts described in lesson 17. They are quick and look good

Jan 17, 2003 at 10:32 AM

I had the same problem...
Use the fonts described in lesson 17. They are quick and look good

Jan 17, 2003 at 10:34 AM

Uups I didn''t want the spam...
I don''t know why it is here...

vincoof

Jan 17, 2003 at 2:26 PM

DaZ: yes bitmaps are really slow. It''s pretty weird since bitmaps are in theory the fastest way to render pictures, but since consumer cards are designed for games before all, and because bitmaps are not a priority for games (not like textures), the direct consequence is that our famous GeForce or Radeon are really slow with bitmaps.
In other words, if you had a professional card (for instance a SGI workstation) you would experience far better performance.

PM: you can delete your dubbed posts by clicking the ''edit post'' button and then check the ''Delete post'' box before entering the ''make modifications'' button.

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