256 lines
14 KiB
HTML
256 lines
14 KiB
HTML
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<h1 class="menu-title">Filament</h1>
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<div id="content" class="content">
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<main>
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<h1 id="backend-unit-tests"><a class="header" href="#backend-unit-tests">Backend Unit Tests</a></h1>
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<p>These are tests that ensure the Filament backend is working properly on various operating systems
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and graphics backends.</p>
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<p>The majority of these tests generate images that are then compared against a known golden image.</p>
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<h2 id="running-with-a-specific-graphics-library"><a class="header" href="#running-with-a-specific-graphics-library">Running with a specific graphics library</a></h2>
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<p>Run with <code>-a<backend></code> to run with a specific backend, such as <code>-avulkan</code> for vulkan or <code>-ametal</code>
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for metal.</p>
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<h2 id="image-comparisons"><a class="header" href="#image-comparisons">Image comparisons</a></h2>
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<p>The expected images are stored as PNG files in the <code>expected_images</code> subdirectory of the test source
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code. When cmake is run it will copy this directory to the build output creating
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<code>images/expected_images</code> inside the same directory as the unit test binary.</p>
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<p>The unit tests will then write their resulting images into <code>images/actual_images</code> in order to make
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the tests easier to debug.</p>
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<p>If an image comparison test fails, it writes a diff image to <code>images/diff_images</code> where each pixel of the diff is white (255,255,255) if the comparison for the corresponding pixel succeeds and black (0,0,0) of the comparison for the corresponding pixel fails.</p>
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<h3 id="python-utility-for-updating-golden-images-and-comparing-results"><a class="header" href="#python-utility-for-updating-golden-images-and-comparing-results">Python utility for updating golden images and comparing results</a></h3>
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<p>Inside the unit test source code directory there is a python script called
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<code>move_actual_images_to_expected.py</code>.
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It will display the actual and expected images side-by-side and copy the actual image into the
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source tree's <code>expected_images</code> directory if the user approves the change.</p>
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<h4 id="directories"><a class="header" href="#directories">Directories</a></h4>
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<p>The <code>-r</code> flag is required and should be the directory where the test binary is.</p>
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<p>If not running the script from the directory it's in, <code>-s</code> should be the source code's
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<code>expected_images</code> directory.</p>
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<h4 id="configuring-comparemove-behavior"><a class="header" href="#configuring-comparemove-behavior">Configuring compare/move behavior</a></h4>
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<p>The <code>-c</code> flag has the tool display the actual and expected images side-by-side. By default it
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does this by opening both with the OS's default behavior. <code>-p</code> can be used to specify a different
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terminal program.</p>
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<p>The <code>-m</code> flag has the tool move the actual image to overwrite the expected image in the source
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tree. If the images are also being compared then the move will only happen if the user approves the
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change.</p>
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<p>After updating the expected images, cmake will need to be run again to copy them to the binary's
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directory. Also, currently some platforms can't load images to compare and so have the hash
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hardcoded into the test source code, so for now those need to be updated by running the test and
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copying the value manually.</p>
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<h4 id="picking-which-tests-to-compare"><a class="header" href="#picking-which-tests-to-compare">Picking which tests to compare</a></h4>
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<p>The <code>-x</code> flag causes the tool to check the <code>test_detail.xml</code> file and only process the images who
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failed a comparison. <code>--gtest_output=xml</code> needs to be passed to the test binary to generate this
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file.</p>
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<p>The <code>-t</code> argument takes a list of images to compare, provided as the file name without the <code>.png</code>
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suffix.</p>
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<h2 id="unsupported-tests"><a class="header" href="#unsupported-tests">Unsupported tests</a></h2>
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<p>If a test depends on a feature that is unsupported by the current environment, it will start with
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the <code>SKIP_IF</code> macro. This will cause the test to not be run.</p>
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</main>
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