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readme: Document environment variables.

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Signed-off-by: Józef Kucia <jkucia@codeweavers.com>
Signed-off-by: Henri Verbeet <hverbeet@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
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Józef Kucia 2019-05-17 10:39:15 +02:00 committed by Alexandre Julliard
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@ -28,3 +28,40 @@ at build-time with some modest source modifications.
If vkd3d is available when building Wine, then Wine will use it to support
Direct3D 12 applications.
=====================
Environment variables
=====================
Most of the environment variables used by vkd3d are for debugging purposes. The
environment variables are not considered a part of API and might be changed or
removed in the future versions of vkd3d.
Some of debug variables are lists of elements. Elements must be separated by
commas or semicolons.
* VKD3D_CONFIG - a list of options that change the behavior of libvkd3d.
* vk_debug - enables Vulkan debug extensions.
* VKD3D_DEBUG - controls the debug level for log messages produced by
libvkd3d. Accepts the following values: none, err, fixme, warn, trace.
* VKD3D_VULKAN_DEVICE - a zero-based device index. Use to force the selected
Vulkan device.
* VKD3D_DISABLE_EXTENSIONS - a list of Vulkan extensions that libvkd3d should
not use even if available.
* VKD3D_SHADER_DEBUG - controls the debug level for log messages produced by
libvkd3d-shader. See VKD3D_DEBUG for accepted values.
* VKD3D_SHADER_DUMP_PATH - path where shader bytecode is dumped.
* VKD3D_TEST_DEBUG - enables additional debug messages in tests. Set to 0, 1
or 2.
* VKD3D_TEST_PLATFORM - can be set to "wine", "windows" or "other". The test
platform controls the behavior of todo(), todo_if(), bug_if() and broken()
conditions in tests.
* VKD3D_TEST_BUG - set to 0 to disable bug_if() conditions in tests.