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OpenGL Realistic textures size for compatibility

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Hey, after reading a few different recommendations on OpenGL textures size, I'm not sure if what I want to do is safe. Some said that textures of 512*512 and even 1024*1024 are fine, but others suggest to never go higher than 256*256 pixels. The problem is that I really need to have one big texture in 1024*1024 and cannot separate it in multiple textures ( Since it's one huge file storing my tiles in a tile-based game ). And now, I am really not sure if 1024*1024 will be supported on a good amount of video card or not. I have a radeon 9800 pro 128mb and it's fine, but I'm afraid it might not work on many other video cards. So, I would like to know if anyone know if it's ok to assume that nowadays, most video cards in the average computer can support this size? Thanks a lot.

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I was wondering about this lately too. Do older cards have support for 256x256 textures? I remember back in the day, (heh more like 3 years ago) certain cards would barf if you tried anything bigger than 256x256. Do the older 3d cards have limits like 128x128?

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Original post by Vampyre_Dark
I was wondering about this lately too. Do older cards have support for 256x256 textures? I remember back in the day, (heh more like 3 years ago) certain cards would barf if you tried anything bigger than 256x256. Do the older 3d cards have limits like 128x128?

No. Even the very first consumer level 3D card ever produced, the 3Dfx Voodoo-1, supported 256*256. Today, every card should support at least 2048*2048. If you want to be perfectly safe with some older cards, use 1024*1024 at most. The only cards limited to 256*256 were the very first Voodoos (1, 2 and 3), and some other exotic and obsolete chipsets that never offered full OpenGL or D3D support anyway. Seriously, any card that remotely calls itself "3D" and supports a major 3D API will have at least 1024*1024. Don't worry about it.

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