101 lines
2.8 KiB
ReStructuredText
101 lines
2.8 KiB
ReStructuredText
A Vulkan layer to display information about the running application using an overlay.
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Building
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=======
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The overlay layer will be built if :code:`overlay` is passed as a :code:`vulkan-layers` argument. For example:
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.. code-block:: sh
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meson -Dvulkan-layers=device-select,overlay builddir/
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ninja -C builddir/
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sudo ninja -C builddir/ install
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See `docs/install.rst <https://gitlab.freedesktop.org/mesa/mesa/-/blob/master/docs/install.rst>`__ for more information.
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Basic Usage
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=======
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Turn on the layer:
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.. code-block:: sh
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VK_INSTANCE_LAYERS=VK_LAYER_MESA_overlay /path/to/my_vulkan_app
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List the available statistics:
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.. code-block:: sh
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VK_INSTANCE_LAYERS=VK_LAYER_MESA_overlay VK_LAYER_MESA_OVERLAY_CONFIG=help /path/to/my_vulkan_app
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Turn on some statistics:
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.. code-block:: sh
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VK_INSTANCE_LAYERS=VK_LAYER_MESA_overlay VK_LAYER_MESA_OVERLAY_CONFIG=submit,draw,pipeline_graphics /path/to/my_vulkan_app
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Position the overlay:
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.. code-block:: sh
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VK_INSTANCE_LAYERS=VK_LAYER_MESA_overlay VK_LAYER_MESA_OVERLAY_CONFIG=submit,draw,pipeline_graphics,position=top-right /path/to/my_vulkan_app
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Logging Statistics
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=======
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Log statistics to a file:
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.. code-block:: sh
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VK_INSTANCE_LAYERS=VK_LAYER_MESA_overlay VK_LAYER_MESA_OVERLAY_CONFIG=output_file=/tmp/output.txt /path/to/my_vulkan_app
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Logging is enabled for the entire lifecycle of the process unless a control socket is specified (see below).
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**Note:** some statistics (e.g. :code:`frame_timing` and :code:`gpu_timing`) log values for the entire sample interval instead of per-frame.
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For these statistics, logging the :code:`frame` statistic allows one to compute per-frame statistics after capture.
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Log statistics to a file, controlling when such statistics will start to be captured:
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.. code-block:: sh
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VK_INSTANCE_LAYERS=VK_LAYER_MESA_overlay VK_LAYER_MESA_OVERLAY_CONFIG=output_file=/tmp/output.txt,control=mesa_overlay /path/to/my_vulkan_app
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The command above will open a Unix socket with the abstract path :code:`mesa_overlay`. When a control socket is specified,
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logging must be explicitly enabled through the control socket. :code:`mesa-overlay-control.py` provides a convenient CLI:
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.. code-block:: sh
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mesa-overlay-control.py start-capture
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.. code-block:: sh
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mesa-overlay-control.py stop-capture
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Direct Socket Control
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------
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The Unix socket may be used directly if needed. Once a client connects to the socket, the overlay layer will immediately
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send the following commands to the client:
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.. code-block:: sh
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:MesaOverlayControlVersion=1;
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:DeviceName=<device name>;
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:MesaVersion=<mesa version>;
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The client connected to the overlay layer can enable statistics capturing by sending the command:
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.. code-block:: sh
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:capture=1;
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And disable it by sending:
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.. code-block:: sh
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:capture=0;
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.. _docs/install.rst: ../../docs/install.rst
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