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what is the optimal texture size in this case for pixel perfect fit on screen and for performance?
Target: background texture for a device with 480×800 resolution
a.
480×800 image resized to: 512×1024
b.
512×1024 texture contains a 480×800 region and
u = 0.0 .. 0.9375 (480/512)
v = 0.0 .. 0.78125 (800/1024)
c.
original image (480×800) as texture
Option c. should be avoided as many devices are only power-of-two compatible. b. should be faster than a. since not as many texels have to be fetched from the texture memory. I doubt however that you will notice any difference in fps as at 480×800 you’re most likely to be fillrate-limited more than anything else.
And yes, you can get pixel-perfect mapping using b. if you set your texcoords correctly, I’m using a texture atlas giving p-p results for my app.