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It appears that storage for varyings in a wave has an upper
limit of wavesize * max_a831 where max_a831 is 64.
Exceeding the limit seam to force gpu to reduce primitives
processed per wave, at least calculations make sense with
such interpretation.
With blob SP_HS_UNKNOWN_A831 never exceeds 64 and setting
it to 65 in freedreno leads to a hang.
On A630 tests (patch_size=3 + gl_Position + array of vec4)
have shown such relation:
| Num of vec4 | A831 | PC_HS_INPUT_SIZE |
|-------------|------|------------------|
| 1 | 0x10 | 0xc |
| 2 | 0x14 | 0xf |
| 3 | 0x18 | 0x12 |
| 4 | 0x1c | 0x15 |
| 5 | 0x20 | 0x18 |
| 6 | 0x24 | 0x1b |
| 7 | 0x28 | 0x1e |
| 8 | 0x2c | 0x21 |
| 9 | 0x30 | 0x24 |
| 10 | 0x34 | 0x27 |
| 11 | 0x38 | 0x2a |
| 12 | 0x3c | 0x2d |
| 13 | 0x3f | 0x30 |
| 14 | 0x40 | 0x33 |
| 15 | 0x3d | 0x36 |
| 16 | 0x3d | 0x39 |
| 17 | 0x40 | 0x3c |
| 18 | 0x3f | 0x3f |
| 19 | 0x3e | 0x42 |
| 20 | 0x3d | 0x45 |
| 21 | 0x3f | 0x48 |
| 22 | 0x3d | 0x4b |
| 23 | 0x40 | 0x4e |
| 24 | 0x3d | 0x51 |
| 25 | 0x3f | 0x54 |
| 26 | 0x3c | 0x57 |
| 27 | 0x3e | 0x5a |
| 28 | 0x40 | 0x5d |
| 29 | 0x3c | 0x60 |
| 30 | 0x3e | 0x63 |
| 31 | 0x40 | 0x66 |
|-------------|------|------------------|
Brief tests with high patch sizes also confirm that formula
matches blob behaviour.
A831 is not a limit for storage available for one thread, so
naming it as SP_HS_WAVE_INPUT_SIZE would make more sense.
Fixes:
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|---|---|---|
| .appveyor | ||
| .gitlab/issue_templates | ||
| .gitlab-ci | ||
| bin | ||
| build-support | ||
| docs | ||
| doxygen | ||
| include | ||
| scons | ||
| src | ||
| subprojects | ||
| .dir-locals.el | ||
| .editorconfig | ||
| .gitignore | ||
| .gitlab-ci.yml | ||
| .mailmap | ||
| .travis.yml | ||
| Android.common.mk | ||
| Android.mk | ||
| appveyor.yml | ||
| CleanSpec.mk | ||
| common.py | ||
| meson.build | ||
| meson_options.txt | ||
| README.rst | ||
| REVIEWERS | ||
| SConstruct | ||
| VERSION | ||
`Mesa <https://mesa3d.org>`_ - The 3D Graphics Library ====================================================== Source ------ This repository lives at https://gitlab.freedesktop.org/mesa/mesa. Other repositories are likely forks, and code found there is not supported. Build & install --------------- You can find more information in our documentation (`docs/install.rst <https://mesa3d.org/install.html>`_), but the recommended way is to use Meson (`docs/meson.rst <https://mesa3d.org/meson.html>`_): .. code-block:: sh $ mkdir build $ cd build $ meson .. $ sudo ninja install Support ------- Many Mesa devs hang on IRC; if you're not sure which channel is appropriate, you should ask your question on `Freenode's #dri-devel <irc://chat.freenode.net#dri-devel>`_, someone will redirect you if necessary. Remember that not everyone is in the same timezone as you, so it might take a while before someone qualified sees your question. To figure out who you're talking to, or which nick to ping for your question, check out `Who's Who on IRC <https://dri.freedesktop.org/wiki/WhosWho/>`_. The next best option is to ask your question in an email to the mailing lists: `mesa-dev\@lists.freedesktop.org <https://lists.freedesktop.org/mailman/listinfo/mesa-dev>`_ Bug reports ----------- If you think something isn't working properly, please file a bug report (`docs/bugs.rst <https://mesa3d.org/bugs.html>`_). Contributing ------------ Contributions are welcome, and step-by-step instructions can be found in our documentation (`docs/submittingpatches.rst <https://mesa3d.org/submittingpatches.html>`_). Note that Mesa uses gitlab for patches submission, review and discussions.