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Wow, how long's that been there? Embarrassing.
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Check for NaN/Inf, print exec vectors, print temp registers.
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The 'dots' register wasn't getting properly un-negated and un-swizzled
after emitting the code for back-face lighting. So, if more than one
light source was enabled, the specular exponent for the next light source
was wrong.
During execution we were evaluating pow(x, y) where y was negative instead
of positive. This led to the outcome being zero or NaN.
This fixes the occasional black triangles seen in isosurf when hacked to
enable two-sided lighting.
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And print/warn NaN/Inf in print_vertex().
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(cherry picked from commit b65bc1b6cb72df950c2e26446936804dfcdc432c)
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A breakpoint is much nicer than abort when gdb is attached.
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Clearly, something else is wrong.
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ARGB, not RGBA.
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Why didn't this come up before?
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We don't upload the pixels with the CPU in that case, so the map will
only serve as a way of triggering cache flushes over a bunch of data we
don't touch.
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