If we program an output size of 0 the simulator asserts. This was
not a problem until now because our VS would always have to
emit fixed function outputs, however, now that it can be paired
with a GS we can end up with a VS shader that no longer emits
any outputs.
Reviewed-by: Alejandro Piñeiro <apinheiro@igalia.com>
Geometry shaders can output many vertices and thus have higher VPM memory
pressure as a result. It is possible that too wide geometry shader dispatches
exceed the maximum available VPM output allocated, in which case we need
to reduce the dispatch width until we can fit the VPM memory requirements.
Supported dispatch widths for geometry shaders are 16, 8, 4, 1.
There is a limit in the number of VPM output sectors that can be used by a
geometry shader that we can meet by lowering the dispatch width at compile
time, however, at draw time we need to revisit this number and, together with
other elements that can contribute to total VPM memory requirements, decide
on a configuration that can fit the program into the available VPM memory.
Ideally, we also want to aim for not using more than half of the available
memory so we that we can run a pair of bin and render programs in parallel.
v2: fixed language in comment and typo in commit log. (Alejandro)
Reviewed-by: Alejandro Piñeiro <apinheiro@igalia.com>
According to the documentation, the 1-way dispatch width is only supported
with geometry shaders.
Reviewed-by: Alejandro Piñeiro <apinheiro@igalia.com>
This is good enough to get basic GS workloads working, later patches will
improve this by adding instancing support, proper SIMD configuration, etc.
Notice that most of the TESSELLATION_GEOMETRY_SHADER_PARAMS fields are only
relevant when tessellation shaders are present. We do not support tessellation
yet, but we still need to fill in these tessellation state with default values
since our packing functions require some of these to have non-zero values.
v2:
- Add a comment in the code explaining why we fill in
tessellation fields (Alejandro)
Reviewed-by: Alejandro Piñeiro <apinheiro@igalia.com>
Every code address starts at bit 3 (addresses must be 64-bit aligned),
with the first 3 bits used to specify threading and NaN propagation
parameters for the shader program.
We generally skip "reserved" bits, however, doing this when the
reserved field is the last in a struct and it is large enough can
make us compute incorrect (smaller) struct sizes which can
lead to corrupt CLs. In particular, the "Tess/Geom Common Params"
struct has a reserved field at the end that is 8-bit, so if we
don't include this we compute a packet size that is 1 byte smaller
than it shold, making the next packet we emit start 1 byte
earlier and therefore leading to incorrect CL data from that point
forward.
The name of one of the fields was not correct.
Reviewed-by: Alejandro Piñeiro <apinheiro@igalia.com>
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>
While lowering vpm outputs we look for the NIR variables matching
particular store output instructions and we expect to find a match,
so assert on that.
Reviewed-by: Alejandro Piñeiro <apinheiro@igalia.com>
BEGIN_RING() could decide we can't fit the next packet in the current
cmdstream segment, and grow a new segment. So we need to grab ring->cur
*after* BEGIN_RING(), otherwise we are writing cmdstream past the end of
the previous segment.
Fixes: bdd98b892f ("freedreno: New struct packing macros")
Signed-off-by: Rob Clark <robdclark@chromium.org>
The current strategy using the suballocator with fixed size doesn't
scale and causes some programs with large number of vertices (like some
glmark2 scenes) to crash.
Change it to dynamically allocate a separate bo to accomodate for
arbitrary number of vertices.
This also fixes the buffer read/write flags for gp.
Signed-off-by: Erico Nunes <nunes.erico@gmail.com>
Reviewed-by: Vasily Khoruzhick <anarsoul@gmail.com>
Reviewed-by: Andreas Baierl <ichgeh@imkreisrum.de>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/2445>
I feel really bad about this but this one test is flaking. I don't want
to do a mass revert (and bisection is extremely difficult with
nondeterministic/Heisenbugs), but it's Friday night and master needs to
pass. This commit should be reverted asap (once the flake is solved)
Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
This can be used to start/stop statistics capturing from the command
line.
v3:
- Install script (Lionel)
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
By default, if an output_file is specified, the overlay layer will start
capturing data immediately. After this commit, when a control socket is
used, the capture starts disabled by default, and is only enabled when a
command ":capture=1;" is received.
when the capture is enabled, we might have already accumulated some
stats. To avoid capturing such noise, we discard and reset the fps and
stats, updating the display and capturing only data from that point on.
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Add support for socket from which the overlay layer can receive
commands. This control socket can be useful to allow setting options
once the application is already running. For instance, triggering the
capture of fps data at a certain point.
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Add some infrastructure to trace scheduler decisions. The next patch
will add some more traces, just splitting this out to reduce clutter.
Signed-off-by: Rob Clark <robdclark@chromium.org>
Sometimes sched changes that are a win in terms of instruction count
and/or register pressure, are worse in real life, due to keeping varying
storage locked for too long. Add a shader-db stat to give this more
visibility.
Signed-off-by: Rob Clark <robdclark@chromium.org>
Iago Toral Quiroga