Matt Pharr ea027a95a8 Fix various places in deferred shading example that assumed programCount >= 4. ...

This gets deferred closer to working with the scalar target, but there are still
some issues.  (Partially in gamma correction / final clamping, it seems.)

This fix causes a ~0.5% performance degradation with e.g. the AVX target, 
though it's not clear that it's worth having a separate code path in order to
not lose this small amount of perf.

(Partially addresses issue #167)

2012-01-31 11:46:33 -08:00

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