takes an optional bias parameter that allows control over the level of mipmaps from which a texel is taken, with negative values leading to a higher-resolution mip-map being used than otherwise, and positive values biasing towards a lower resolution mipmap. While this works as expected in the simulator and on the iPad1 and iPhone 4, iPad2 behaviour is very erratic, in my sample case with values between 0 and -3.9 seemingly not having any effect at all, and values less than -3.9 apparently leading to all texels being read from the original texture, i.e. mipmapping turned off.
Is this a bug or am I missing something?
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