Hello, Mesa master has been hitting assert failures when running "XCOM: Enemy Unknown" since commit f8d69beed49c64f883bb8ffb28d4960306baf575, where we started asserting that the SAMPLER_STATE LOD Bias value actually fits in the correct number of bits.
Apparently, XCOM calls glTexEnv(GL_TEXTURE_FILTER_CONTROL_EXT, GL_TEXTURE_LOD_BIAS_EXT, val); to set the texture unit LOD bias...but according to gdb, the value is: -nan(0x7ffff3) In i965, we do CLAMP(lod bias, -16, 15)...but NaN ends up failing both the < min and > max comparisons, so it slips through. But, that raises the question...what value *should* we be using? 0? Min? Max? I couldn't find any immediately applicable GL spec text. Anyone know of any? If not, does DirectX mandate something? I wrote a hack to check isnan and replace it with 0, which gets the game working again, but...it seems like we could have this problem in a lot of other places too...and I'm not sure what the right answer is. https://cgit.freedesktop.org/~kwg/mesa/commit/?h=xcom&id=6a1c0515b760c943eb547cced754b465aa3bd4ca Thanks for any advice :) --Ken
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