This is needed due Vulkan because by spec (31.1. Limit Requirements)
the minimum value for the following limits are the following ones:
maxPerStageDescriptorSampledImages 16
maxPerStageDescriptorStorageImages 4
maxPerStageDescriptorInputAttachments 4
And we are using v3d textures for all of them, so current limit would
not be enough for some cases.
Note that as the current comment explains there is not exactly a HW
limit for it, so we could bump to 32 for example, but let's just be
conservative and ask the minimum required.
It is worth to note that we needed to maintain the same value for the
OpenGL case, as it gets a register allocation failure on some GL
cases. We tried to fix that with small changes on the nir scheduler,
but we found that it would require some non-trivial effort to get it
done (that eventually we would need to).
Fixes tests like:
dEQP-VK.binding_model.descriptorset_random.sets16.constant.ubolimitlow.sbolimitlow.imglimitlow.noiub.uab.comp.noia.0
v2: keep the previous limit for Opengl (Eric)
Reviewed-by: Eric Anholt <eric@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6999>
Most of the relevant work happens in the v3d_nir_lower_io. Since
geometry shaders can write any number of output vertices, this pass
injects a few variables into the shader code to keep track of things
like the number of vertices emitted or the offsets into the VPM
of the current vertex output, etc. This is also where we handle
EmitVertex() and EmitPrimitive() intrinsics.
The geometry shader VPM output layout has a specific structure
with a 32-bit general header, then another 32-bit header slot for
each output vertex, and finally the actual vertex data.
When vertex shaders are paired with geometry shaders we also need
to consider the following:
- Only geometry shaders emit fixed function outputs.
- The coordinate shader used for the vertex stage during binning must
not drop varyings other than those used by transform feedback, since
these may be read by the binning GS.
v2:
- Use MAX3 instead of a chain of MAX2 (Alejandro).
- Make all loop variables unsigned in ntq_setup_gs_inputs (Alejandro)
- Update comment in IO owering so it includes the GS stage (Alejandro)
Reviewed-by: Alejandro Piñeiro <apinheiro@igalia.com>
Until now this made sense because we always paired vertex shaders
with fragment shaders, but as soon as we implement geometry and
tessellation shaders that will no longer be the case, so rename
this to (num_)used_outputs.
v2: Use 'used_outputs' instead of ns_outputs, which is more explicit (Eric).
Reviewed-by: Alejandro Piñeiro <apinheiro@igalia.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
4.1 and 4.2 both have the same 16k limit, but it I'm seeing GPU hangs in
the CTS at 8k and 16k. 4k at least lets us get one 4k display working.
Cc: mesa-stable@lists.freedesktop.org
This is the GLES 3.2 minmax, and also what the closed source driver does.
Avoids hitting OOMs in the CTS's
dEQP-GLES3.functional.texture.units.all_units.only_cube.1.
