On 25.01.2016 23:45, Ilia Mirkin wrote:
On Mon, Jan 25, 2016 at 11:00 PM, Michel Dänzer <mic...@daenzer.net> wrote:
On 26.01.2016 01:17, Nicolai Hähnle wrote:
On 25.01.2016 10:04, Ilia Mirkin wrote:
Yeah so this isn't going to fly. r600/radeonsi both expose
PIPE_CAP_COMPUTE, for clover, but won't support these compute shaders
quite yet. Not sure what the solution is here... maybe just add
another cap? PIPE_CAP_GLSL_COMPUTE or something? Or require a backend
to also set PIPE_CAP_GLSL_VERSION to 430 for ARB_compute_shader to
become exposed? Don't know.
GLSL 430 also requires arrays_of_arrays. I don't actually know how much
we need to do to support that, but maybe it'd be better not to depend on
that.
A new cap is an option. A slightly weird but I think reasonable option
would be to require a PIPE_CAP_GLSL_VERSION of 420, since
ARB_compute_shader officially requires OpenGL 4.2 anyway, and then let
us deal with the fallout when we up that version number.
I guess that works, but FWIW, a more general solution might be to split
up PIPE_SHADER_CAP_PREFERRED_IR into individual caps for each IR, and
enable ARB_compute_shader only if TGSI is supported for PIPE_SHADER_COMPUTE.
How about a PIPE_SHADER_CAP_SUPPORTED_IRS which returns a bitfield of
all the supported pipe_shader_ir's.
That sounds good to me.
Nicolai
-ilia
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