hi, i wrote a "little" progam using opengl (and delphi). it ran really smooth and i coded about 2200 lines now because i haven''t had any problems. but a few minutes ago, i had an idea: i wanted to test my program on another machine and ... it was REALLY slow (max 10 fps). i programmed it using my geforce 3 ti200 - but i thought it should run on a geforce 2 mx smoothly, too. i already played "black & white" on this machine - so it is impossible that it is THAT slow. perhaps, one of you can give me a hint..... thx -- Andy aka feroCT5

Not without more information.
Some of your code perhaps?

But as an almost random guess: Are you using any programmable vertex/pixel shaders?

The GeForce3 will accelerate vertex and pixel shaders, so it''ll run smoothly - the GeForce2 MX won''t accelerate them.

Although I mainly use DirectX - I don''t even know if it''s possible for OpenGL to be doing vertex/pixel shaders without hardware support.

More information would be helpful though.

(glad to see people using Delphi for games & graphics)

John B

this may sound obviouse but it was the problem on my machine -> do you have the latest drivers? I bought a new video card and the drivers that came with it didn''t support openGL so I looked for an update on the net, installed the up-to-date driver and it worked.

A strategy sports game that can turn into open warfare
''Bloody Football'' - www.koalacomics.com.au/bloody

also lines are really slow compared to other primitives, most cards break them into triangles I believe

Using stencil-buffer with 16bit colors? Hardware on Geforce3, but on anything older software if I remember right.


Yesterday we still stood at the verge of the abyss,
today we''re a step onward!

I think when he said he "coded lines", he didn''t mean drawing lines on the screen!

OK,

i''ll try to reply to all of your postings:

1. i am not using pixel or vertex shader
2. i am using the latest drivers on both machines
3. i am not drawing lines - these lines are my SOURCE CODE LINES as the anonymous poster already said
4. i am not using stencil buffer

in my opengl scene, i''ve got 2 lights and about 160-180 textured quads. i think this isn''t a lot of work for a GF2-MX GPU.

that is why i said my app is REALLY slow!

for those who want some source code - i don''t know what part of my source code could be interesting for you... ;(

thx for your replies -- Andy aka feroCT5

Have you checked whether your app is running in software mode on the slow machine? Just to a test to see which driver is being used.

Another thing is textures - what sizes? and are they a 2^x height and width?

Finally are the two machines running the same OS? and check for any nasty background apps like mcaffee, and nortons, they can be a bit odd sometimes.

I had a problem once where my OpenGL suddenly decided not to use my hardware (I don''t know why). I wouldn''t have caught it, but in my game''s extended information I''ve got it showing glGetString(GL_RENDERER), it was showing up as Microsoft OpenGL or something, instead of NVidia GeForce2/MX/...

Maybe this will help you. Good luck

could you show the code which sets up your pixelformat stuff?