The new early-ZS helpers are pure functions, leaf nodes of the call graph, and
implemented with a different algorithm from the "oracle" table of correct values
for various combinations of states. Further, incorrect settings often still pass
CTS while causing game bugs or inefficiencies. That combination makes the
helpers an excellent candidate for unit tests. Add some.
Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17428>
Bifrost (and Valhall) separate early-ZS configuration into two fields: when does
the depth/stencil buffer update happen? and when are pixels killed by the
depth/stencil tests? The driver separately configures these to occur early
(before the shader executes) or late (after the ATEST instruction executes at
the end of the shader). Early tests are generally more efficient, but various
combinations of API state and fragment shader properties can require late
updates and/or late kills for correctness. Determining how to configure these
fields is nontrivial.
Our current implementation (on Bifrost) configures these fields at fragment
shader compile time and bakes the settings into the RSD. This is both wrong
(using early testing when late testing is required) and suboptimal (using late
testing when early testing would suffice). We need to defer this configuration
until draw time, when we know rasterizer and Z/S state.
Reclassifying at draw time (as we currently do on Valhall) would be expensive,
especially with the extra terms added in here. To cope, decouple the shader
classification from the draw-time configuration. Since there are only a few bits
of draw state involved, this implementation just calculates all possible states.
Then the draw time classification is just indexing into a lookup table.
The actual algorithm used to classify is written with correctness and clarity in
mind. Unlike the current classification algorithm (which tries to match what the
DDK does, poorly), this algorithm embeds its proofs of correctness.
Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Cc: mesa-stable
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17428>
Before we used GenXML, pan_texture mixed layout code with texture descriptor
packing code. For the most part, the layout code is generation-independent; the
pack code is not. We introduced an anti-pattern where the file was compiled N+1
times: N times for each PAN_ARCH value, and an extra time with no PAN_ARCH
value. And then the contents of the file changed completely depending on
PAN_ARCH. This is a pretty weird construction.
Let's instead split off the layout file from the descriptor file, compile the
layout file once, and compile the descriptor file per-gen.
Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15991>
We need to map to the interchange format, since there is no longer a pixel
format for the memory layout. Use this new format table on v9.
Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15586>
These kernels aren't tested (and are probably broken) elsewhere. Don't
waste cycles trying to compile for other architectures. This reduces the
amount of code that needs to be ported to a new architecture.
Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14064>
Start with the enums that were manually redefined in
pan_{texture,format}.h and the blend equation descriptors.
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12208>
We will soon have per-gen pack headers. Let's rename the meson variables
to reflect that.
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12551>
dEQP has poor coverage of clear colours with odd formats, and doesn't
check that we dither as expected. This functionality is trivial to unit
test, so there's no excuse not to. Nontrivial reference values are
captured from pandecode of the Mali G52 DDK but should be valid for all
Midgard/Bifrost.
Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12365>
At the beginning of a render pass, the hardware will fill the tilebuffer
with an arbitrary 128-bit word. To implement colour clears, the driver
must pack the API-specific clear colour according to the 128-bit layout
of the tilebuffer. This layout depends only on the render target format.
The existing code to handle this was based on loose guesswork. It works
for the format / clear colour combinations tested in dEQP-GLES3, but it
is severely deficient in the general case. It works by matching on the
PIPE format of the render target (not the layout of the tilebuffer). For
special cased PIPE formats, it open codes a buggy pack routine.
Otherwise, it defaults to util_pack_color in the hope that will work.
Since util_pack_color doesn't know anything about Mali tilebuffer
layouts, that means it's defaulting to wrong behaviour.
Now that we understand internal tilebuffer layouts, let's rewrite the
packing code. Instead of matching PIPE formats, map the PIPE format to
the internal tilebuffer layout using the common table, ensuring the
mapping remains in sync with the render target descriptor. Then for
blendable tilebuffer formats, pack using a common float -> fixed point
path supporting optional sRGB translation. Raw formats use
util_pack_color as before.
For formats with less than 8 bits per channel, the new code uses the
fractional bits of the fixed-point representation. This is required for
correct dithering if the clear colour is not exactly representable in
the final low precision format.
In summary, at least the following bugs in the old code are fixed:
* Swapped R/B channels with sRGB
* Swapped R/B channels with some missing formats
* Incorrect dithering with RGB565, RGB5_A1
Fixes the following test cases:
dEQP-EGL.functional.wide_color.window_8888_colorspace_srgb
dEQP-EGL.functional.wide_color.pbuffer_8888_colorspace_srgb
dEQP-EGL.functional.wide_color.window_888_colorspace_srgb
dEQP-EGL.functional.wide_color.pbuffer_888_colorspace_srgb
Later in the series, unit tests are added for the new implementation.
Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Cc: mesa-stable
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12365>
Add unit tests for the fixed-function blending helpers in pan_blend.c.
Each test consists of a Porter-Duff blend mode and the associated
hardware state. In this commit, we add tests for the most common modes.
For motivation, this code has NOT been properly tested in CI. True,
functional correctness of the blend module as a whole is tested by
dEQP-GLES3.functional.fragment_ops.blend.* among other integration
tests. However, this testing is insufficient to check for regressions.
Crucially, the following broken patch would clear CI:
bool pan_can_fixed_function(...) {
return false;
}
In that case, blend shaders are used 100% of the time, which will
regress performance horribly but still pass dEQP. The only clue
something went wrong would be some traces changing checksum due to the
fixed-function blender producing slightly different output than
equivalent blend shaders. By unit testing the fixed blend path, we
ensure we always use the fixed-function path when we expect it to.
Similarly, using incorrect values for the blend metadata may not affect
functional correctness but will increase power consumption. Let's check
all the data we export to drivers.
Note: due to additive commutativity, there are many pairs of equivalent
Mali blend modes. Unfortunately, the vendor is... inconsistent about how
to resolve ambiguous modes. Our algorithm for computing modes is
correct; the "preferred" values are left in comments since otherwise our
tests fail despite correct code. I want to blame Bifrost for this, but
Midgard was patient zero.
Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12152>
This allows us to unify the midgard and bifrost tables and just #ifdef
the differences. It will soon also allow us to fix a bunch of enums and
specialize blendable formats.
Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11785>
This will become the home for little GenXML-aware helpers, suitable to
be #include'd from pan_cmdstream.c (or panvk equivalent).
Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11785>
Declare a meson dependency for libpanfrost and wrap some key functions
within an extern C block allowing proper compilation by C++ compilers.
Signed-off-by: Antonio Caggiano <antonio.caggiano@collabora.com>
Acked-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10462>
Indirect dispatch is implemented using an extra compute job patching
the compute job header to apply the final num_workgroup values. Add
helpers to simplify emission of the such jobs.
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10332>
Now that the gallium driver uses the pan_preload() helpers we can get
rid of the code in pan_blit.c and all its dependencies.
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10033>
pan_blitter.c is meant to replace the pan_blit.c which currently
provides helpers to preload the tile buffer. Some changes
are worth mentioning:
- we use pre-frame DCDs on Bifrost (Midgard still uses a tiler job
to preload the tile buffer)
- the blit shaders are now stored in a hash table and created lazily
- we now cache blend shader binaries and blit RSDs too
This library will soon be extended to cover regular blits.
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10033>
Now that image and image views are gallium-agnostic and contain enough
information, we can provide generic helpers to emit FB descriptors and
their dependencies, thread storage and tiler descriptors.
This helpers will be re-used in the Vulkan driver.
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10033>
Indirect draws are implemented with compute jobs patching the
vertex/tiler jobs. Provide helpers to do that.
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Alyssa Rosenzweig <alyssa@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8700>
Most of it is API-independent, so let's move it out of the gallium
driver so it can be shared with the Vulkan driver.
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Acked-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8963>
Move panfrost_compile_shader() and panfrost_get_shader_options() to
pan_shader.c and drop the {bifrost,midgard}_compile.h include so backend
compiler internals are not directly exposed to the gallium driver.
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Acked-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8963>
Needed to correctly implement multisampling on Bifrost, and used in
gl_SamplePosition implementation on Midgard. These are architecturally
invariant, so it's fine to hard code.
Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8774>
