[Mesa-dev] Enabling ARB_gpu_shader5 in mesa/st

[Ilia Mirkin]

Hello,

The mesa/main support for ARB_gs5 is nearly ready, and I have the
various mesa/st patches all sent out. The last bit is the dynamic
sampler support which I think will Just Work in mesa/st once glsl lets
it through.

Most extensions are enabled on the basis of a PIPE_CAP_*, either it
being enabled, or being > some limit. However ARB_gs5 is an extension
composed of like 10 sub-features. I could go through and add caps for
each of them, but that seems really excessive. In a future universe,
we might rely on PIPE_CAP_GLSL_FEATURE_LEVEL >= 400, but since
fp64/tess support aren't there yet (and may not be implemented by all
drivers simultaneously when they are), I feel a little weird about
using that as the "defining" metric. But it's not so bad -- fp64 could
require some sort of DOUBLE shader cap, and tess could check for max
instructions with the relevant PIPE_SHADER_*.

What's the preferred way of doing this?

Cheers,

  -ilia