openGL renders incredibly slowly on some computers
I have written a simple program which renders a harmonic oscillator in openGL, and when i run it i get about 30 fps on my "main" computer, which is capable of running games like Crysis faster than 30 fps.
However, when i run the exact same executable on my laptop (a significantly slower computer) i get framerates which are about a order of magnitude higher (about 300 fps).
My main computer has a "GeForce 9800 GTX/9800 GTX+/PCI/SSE2" graphics card, which supports openGL 2.1.2 ( according to glGetString(GL_RENDERER) / glGetString(GL_VERSION) ) while my laptop uses a "Intel Cantiga" (some sort of integrated card probably? ) and supports version 1.5.0 Both computers are running windows XP, the slower one is 64-bit;
I was wondering, does anyone know what this might be caused by? It is quite evidently not the program itself, but rather some sort of library / driver maybe?
Last edited by Afr0; April 19th, 2009 at 11:08 AM.
Re: openGL renders incredibly slowly on some computers
I've heard that some graphic cards are incredibly slow when handling images with a non 2-based size (i.e. 64 * 128 pixels and so on).
Debugging is twice as hard as writing the code in the first place.
Therefore, if you write the code as cleverly as possible, you are, by
definition, not smart enough to debug it.
- Brian W. Kernighan
Re: openGL renders incredibly slowly on some computers
Ah, thank you for you your reply, however, that is not the case. I am actually not drawing any images, but three line strips consisting of about 500 vertices each. Even when not drawing anything at all this problem persists.
Re: openGL renders incredibly slowly on some computers
Odds are you're hitting a software (as opposed to hardware) rendering path for some reason. Couldn't guess why without seeing the code. A good starting point would be to print out the glGetString(GL_EXTENSION) lists from the two machines and compare them to see what's missing on the slower machine.
Reply With Quote
Bookmarks