[Mesa-dev] [RFC] More ARB_arrays_of_arrays support

[Timothy Arceri]

This series adds most of the remaining glsl arrays of arrays support. Support for uniform blocks is still missing, I've played around with this but don't have anything working yet.

What do you guys think about adding these changes without the uniform blocks support? Adding these changes now I assume would make it easy for the nir guys to start adding AoA support (if it doesn't exist already) and the intel backend changes could start to be worked on.

For anyone interested the main remaining changes to be made are in:
./glsl/link_uniform_block_active_visitor.cpp
./glsl/link_uniform_blocks.cpp
./glsl/lower_ubo_reference.cpp

For gallium drivers the glsl to tgsi conversion seems to handle everything without changes so at least for the piglit tests I've written everything seem to just work.

There are no piglit regressions from these changes (tested on i965 driver) and all the current arrays of arrays piglit test pass (tested with ilo gallium driver using MESA_GL_VERSION_OVERRIDE=3.3COMPAT MESA_GLSL_VERSION_OVERRIDE=150) besides the uniform block tests. There are also some unreviewed interface linking tests relating to the last 4 patches on the piglit list [1]. I also have some generated execution tests in my piglit repo [2], I'm not sure if I've created these the best way and wish to extend them further so these haven't been sent to the piglit list yet.

[1] http://lists.freedesktop.org/archives/piglit/2015-March/015167.html
[2] https://github.com/tarceri/Mesa_arrays_of_arrays_piglit/tree/execution_tests