[Mesa-dev] [PATCH] st/mesa: fix WPOS adjustment

[Christoph Bumiller]

I hope the new version is correct, the commit message describes why I
did the first change, and the second change is described in a comment.

Note that the MAD for inversion uses Height - 1 instead of Height.

With this, piglit glsl-arb-fragment-coord-conventions and
fbo-depth-sample-compare pass on nvc0.

I was assuming that integer pixel centers for size 100 range from 0 to
99 and half-integer pixel centers from 0.5 to 99.5.

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