Ian, any comment on this?
On Fri, Sep 25, 2015 at 1:32 PM, Ilia Mirkin <imir...@alum.mit.edu> wrote: > Hi Ian (and other spec experts), > > The ARB_ssbo spec mentions the following: > > OpenGL 4.0 (either core or compatibility profile) is required. > > ... > > Additionally, the shading language provides the memoryBarrier() function > to control the relative order of memory accesses within individual shader > invocations and provides various memory qualifiers controlling how the > memory corresponding to individual variables is accessed. > > However the memoryBarrier() function only becomes available in GLSL > 4.20 [along with the glMemoryBarrier() function that the spec also > refers to] or with ARB_shader_image_load_store. > > Is the implication that such functionality should be auto-exposed in > image-less drivers that support ssbo? Or that this functionality > should just not exist unless images are supported? > > This is relevant to me as I plan on adding ssbo support to gallium > before images. Also, is there really anything in there that would > prevent this from being exposed on a GL 3.1 driver (I'm thinking of > freedreno which doesn't support GS yet and is my initial target for > this, since I can make atomics actually work on there, unlike NVIDIA > where the damn things just won't budge without some magic > yet-to-be-found make-it-work bit). > > Cheers, > > -ilia _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/mesa-dev
