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813. By John S. Gruber on 2013-08-18

* Simplify by merging and reordering patches. Rename and document
  patches as appropriate.
* Remove clamping to inside blurring radius, which is now unnecessary.
* Fix the LS Gaussian blur factor creation to cover the final weight
  generated.
* Add a patch to produce an adjustment to the sigma given when the
  LS gaussian blur function is corrected.

812. By John S. Gruber on 2013-08-13

The number of samples in a sigma of x is x*3 + 1. Store shader programs
by sigma rather than by num_samples, which is the number of one-sided
samples, including the zero sample. The number of programs is limited
by NUX_MAX_SIGMA, and is set to the current maximum to avoid a segment
fault. We need to revisit this if the number of samples can be different
at a certain sigma.

811. By John S. Gruber on 2013-08-03

Allocate blur_input dynamically

810. By John S. Gruber on 2013-08-01

Supply weights as part of the offset vectors to reduce the number of
constants used, presumably due to bug of limitation in mesa.

809. By John S. Gruber on 2013-07-13

Working prepared offset vector, but at sigma 2.67 running out of constants

808. By John S. Gruber on 2013-07-11

Sigma 5 with return fixed, offsets processed and clamped sigma set to 5.0

807. By John S. Gruber on 2013-07-05

got statistics

806. By John S. Gruber on 2013-07-04

Just fails to work

805. By John S. Gruber on 2013-07-04

working at 77 instructions

804. By John S. Gruber on 2013-07-04

finding limit checkpoint