This makes it possible for the GLSL compiler to unroll it, which also
avoids the need to use relative addressing. With this change the shader
should hopefully work with the R300G driver.
The unused kernel weights are set to zero so they don't contribute
to the end result.
Thanks to Tom Stellard and Marek Olšák for their suggestions on how
to solve this problem.
CCBUG: 243191
svn path=/trunk/KDE/kdebase/workspace/; revision=1175021
Fredrik Höglund