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zink: add feature-documentation

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This adds some documentation for the current feature-set in Zink,
explaining what extensions are currently needed for what functionality.

Reviewed-By: Mike Blumenkrantz <michael.blumenkrantz@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7116>
This commit is contained in:
Erik Faye-Lund 2020-10-13 18:09:05 +02:00 • committed by Marge Bot
parent f85488ab82
commit d50e8554b9
1 changed files with 57 additions and 0 deletions
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57
docs/gallium/drivers/zink.rst
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@ -8,6 +8,55 @@ The Zink driver is a Gallium driver that emits Vulkan API calls instead
of targeting a specific GPU architecture. This can be used to get full of targeting a specific GPU architecture. This can be used to get full
desktop OpenGL support on devices that only support Vulkan. desktop OpenGL support on devices that only support Vulkan.
Features
--------
The feature-level of Zink depends on two things; what's implemented in Zink,
as well as the features of the Vulkan driver.
OpenGL 2.1
^^^^^^^^^^
OpenGL 2.1 is the minimum version Zink can support, and will always be
exposed, given Vulkan support. There's a few features that are required
for correct behavior, but not all of these are validated; instead you'll
see rendering-issues and likely validation error, or even crashes.
Here's a list of those requirements:
* Vulkan 1.0
* ``VkPhysicalDeviceFeatures``:
* ``logicOp``
* ``fillModeNonSolid``
* ``wideLines``
* ``largePoints``
* ``alphaToOne``
* ``shaderClipDistance``
* ``VkPhysicalDeviceLimits``:
* ``maxClipDistances`` ≥ 6
* Instance extensions:
* `VK_KHR_get_physical_device_properties2`_
* `VK_KHR_external_memory_capabilities`_
* Device extensions:
* `VK_KHR_maintenance1`_
* `VK_KHR_external_memory`_
OpenGL 3.0
^^^^^^^^^^
For OpenGL 3.0 support, the following additional device extensions are
required to be exposed and fully supported:
* `VK_EXT_transform_feedback`_
* `VK_EXT_conditional_rendering`_
Debugging Debugging
--------- ---------
@ -43,3 +92,11 @@ In order to make things a bit easier to follow, we have decided to create our
own IRC channel. If you're interested in contributing, or have any technical own IRC channel. If you're interested in contributing, or have any technical
questions, don't hesitate to visit `#zink on FreeNode questions, don't hesitate to visit `#zink on FreeNode
<irc://irc.freenode.net/zink>`_ and say hi! <irc://irc.freenode.net/zink>`_ and say hi!
.. _VK_KHR_get_physical_device_properties2: https://www.khronos.org/registry/vulkan/specs/1.2-extensions/man/html/VK_KHR_get_physical_device_properties2.html
.. _VK_KHR_external_memory_capabilities: https://www.khronos.org/registry/vulkan/specs/1.2-extensions/man/html/VK_KHR_external_memory_capabilities.html
.. _VK_KHR_maintenance1: https://www.khronos.org/registry/vulkan/specs/1.2-extensions/man/html/VK_KHR_maintenance1.html
.. _VK_KHR_external_memory: https://www.khronos.org/registry/vulkan/specs/1.2-extensions/man/html/VK_KHR_external_memory.html
.. _VK_EXT_transform_feedback: https://www.khronos.org/registry/vulkan/specs/1.2-extensions/man/html/VK_EXT_transform_feedback.html
.. _VK_EXT_conditional_rendering: https://www.khronos.org/registry/vulkan/specs/1.2-extensions/man/html/VK_EXT_conditional_rendering.html