530 lines
23 KiB
Plaintext
530 lines
23 KiB
Plaintext
// Copyright (c) 2014-2017 The Khronos Group Inc.
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// Copyright notice at https://www.khronos.org/registry/speccopyright.html
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[[display,display]]
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== Presenting Directly to Display Devices
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In some environments applications can: also present Vulkan rendering
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directly to display devices without using an intermediate windowing system.
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This can: be useful for embedded applications, or implementing the
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rendering/presentation backend of a windowing system using Vulkan.
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The +VK_KHR_display+ extension provides the functionality necessary to
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enumerate display devices and create sname:VkSurfaceKHR objects that target
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displays.
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=== Display Enumeration
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// refBegin VkDisplayKHR - Opaque handle to a display object
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Displays are represented by sname:VkDisplayKHR handles:
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include::../../api/handles/VkDisplayKHR.txt[]
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// refEnd VkDisplayKHR
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// refBegin vkGetPhysicalDeviceDisplayPropertiesKHR - Query information about the available displays
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Various functions are provided for enumerating the available display devices
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present on a Vulkan physical device.
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To query information about the available displays, call:
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include::../../api/protos/vkGetPhysicalDeviceDisplayPropertiesKHR.txt[]
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* pname:physicalDevice is a physical device.
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* pname:pPropertyCount is a pointer to an integer related to the number of
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display devices available or queried, as described below.
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* pname:pProperties is either `NULL` or a pointer to an array of
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sname:VkDisplayPropertiesKHR structures.
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If pname:pProperties is `NULL`, then the number of display devices available
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for pname:physicalDevice is returned in pname:pPropertyCount.
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Otherwise, pname:pPropertyCount must: point to a variable set by the user to
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the number of elements in the pname:pProperties array, and on return the
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variable is overwritten with the number of structures actually written to
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pname:pProperties.
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If the value of pname:pPropertyCount is less than the number of display
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devices for pname:physicalDevice, at most pname:pPropertyCount structures
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will be written.
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If pname:pPropertyCount is smaller than the number of display devices
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available for pname:physicalDevice, ename:VK_INCOMPLETE will be returned
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instead of ename:VK_SUCCESS to indicate that not all the available values
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were returned.
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include::../../validity/protos/vkGetPhysicalDeviceDisplayPropertiesKHR.txt[]
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// refBegin VkDisplayPropertiesKHR - Structure describing an available display device
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The sname:VkDisplayPropertiesKHR structure is defined as:
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include::../../api/structs/VkDisplayPropertiesKHR.txt[]
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* pname:display is a handle that is used to refer to the display described
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here.
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This handle will be valid for the lifetime of the Vulkan instance.
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* pname:displayName is a pointer to a NULL-terminated string containing
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the name of the display.
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Generally, this will be the name provided by the display's EDID.
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It can: be `NULL` if no suitable name is available.
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If not `NULL`, the memory it points to must: remain accessible as long
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as pname:display is valid.
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* pname:physicalDimensions describes the physical width and height of the
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visible portion of the display, in millimeters.
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* pname:physicalResolution describes the physical, native, or preferred
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resolution of the display.
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[NOTE]
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.Note
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====
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For devices which have no natural value to return here, implementations
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should: return the maximum resolution supported.
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====
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* pname:supportedTransforms tells which transforms are supported by this
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display.
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This will contain one or more of the bits from
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sname:VkSurfaceTransformFlagsKHR.
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* pname:planeReorderPossible tells whether the planes on this display can:
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have their z order changed.
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If this is ename:VK_TRUE, the application can: re-arrange the planes on
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this display in any order relative to each other.
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* pname:persistentContent tells whether the display supports
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self-refresh/internal buffering.
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If this is true, the application can: submit persistent present
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operations on swapchains created against this display.
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[NOTE]
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.Note
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====
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Persistent presents may: have higher latency, and may: use less power when
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the screen content is updated infrequently, or when only a portion of the
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screen needs to be updated in most frames.
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====
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include::../../validity/structs/VkDisplayPropertiesKHR.txt[]
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ifdef::VK_EXT_direct_mode_display[]
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include::../VK_EXT_direct_mode_display/acquire_release_displays.txt[]
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endif::VK_EXT_direct_mode_display[]
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==== Display Planes
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// refBegin vkGetPhysicalDeviceDisplayPlanePropertiesKHR - Query the plane properties
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Images are presented to individual planes on a display.
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Devices must: support at least one plane on each display.
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Planes can: be stacked and blended to composite multiple images on one
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display.
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Devices may: support only a fixed stacking order and fixed mapping between
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planes and displays, or they may: allow arbitrary application specified
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stacking orders and mappings between planes and displays.
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To query the properties of device display planes, call:
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include::../../api/protos/vkGetPhysicalDeviceDisplayPlanePropertiesKHR.txt[]
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* pname:physicalDevice is a physical device.
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* pname:pPropertyCount is a pointer to an integer related to the number of
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display planes available or queried, as described below.
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* pname:pProperties is either `NULL` or a pointer to an array of
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sname:VkDisplayPlanePropertiesKHR structures.
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If pname:pProperties is `NULL`, then the number of display planes available
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for pname:physicalDevice is returned in pname:pPropertyCount.
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Otherwise, pname:pPropertyCount must: point to a variable set by the user to
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the number of elements in the pname:pProperties array, and on return the
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variable is overwritten with the number of structures actually written to
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pname:pProperties.
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If the value of pname:pPropertyCount is less than the number of display
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planes for pname:physicalDevice, at most pname:pPropertyCount structures
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will be written.
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include::../../validity/protos/vkGetPhysicalDeviceDisplayPlanePropertiesKHR.txt[]
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// refBegin VkDisplayPlanePropertiesKHR - Structure describing display plane properties
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The sname:VkDisplayPlanePropertiesKHR structure is defined as:
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include::../../api/structs/VkDisplayPlanePropertiesKHR.txt[]
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* pname:currentDisplay is the handle of the display the plane is currently
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associated with.
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If the plane is not currently attached to any displays, this will be
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sname:VK_NULL_HANDLE.
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* pname:currentStackIndex is the current z-order of the plane.
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This will be between 0 and the value returned by
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fname:vkGetPhysicalDeviceDisplayPlanePropertiesKHR() in
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pname:pPropertyCount.
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include::../../validity/structs/VkDisplayPlanePropertiesKHR.txt[]
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// refBegin vkGetDisplayPlaneSupportedDisplaysKHR - Query the list of displays a plane supports
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To determine which displays a plane is usable with, call
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include::../../api/protos/vkGetDisplayPlaneSupportedDisplaysKHR.txt[]
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* pname:physicalDevice is a physical device.
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* pname:planeIndex is the plane which the application wishes to use, and
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must: be in the range [eq]#[0, physical device plane count - 1]#.
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* pname:pDisplayCount is a pointer to an integer related to the number of
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displays available or queried, as described below.
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* pname:pDisplays is either `NULL` or a pointer to an array of
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sname:VkDisplayKHR handles.
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If pname:pDisplays is `NULL`, then the number of displays usable with the
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specified pname:planeIndex for pname:physicalDevice is returned in
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pname:pDisplayCount.
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Otherwise, pname:pDisplayCount must: point to a variable set by the user to
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the number of elements in the pname:pDisplays array, and on return the
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variable is overwritten with the number of handles actually written to
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pname:pDisplays.
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If the value of pname:pDisplayCount is less than the number of display
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planes for pname:physicalDevice, at most pname:pDisplayCount handles will be
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written.
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If pname:pDisplayCount is smaller than the number of displays usable with
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the specified pname:planeIndex for pname:physicalDevice, ename:VK_INCOMPLETE
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will be returned instead of ename:VK_SUCCESS to indicate that not all the
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available values were returned.
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.Valid Usage
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****
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* [[VUID-vkGetDisplayPlaneSupportedDisplaysKHR-planeIndex-01249]]
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pname:planeIndex must: be less than the number of display planes
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supported by the device as determined by calling
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fname:vkGetPhysicalDeviceDisplayPlanePropertiesKHR
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****
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include::../../validity/protos/vkGetDisplayPlaneSupportedDisplaysKHR.txt[]
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Additional properties of displays are queried using specialized query
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functions.
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==== Display Modes
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// refBegin VkDisplayModeKHR - Opaque handle to a display mode object
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Display modes are represented by sname:VkDisplayModeKHR handles:
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include::../../api/handles/VkDisplayModeKHR.txt[]
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// refEnd VkDisplayModeKHR
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// refBegin vkGetDisplayModePropertiesKHR - Query the set of mode properties supported by the display
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Each display has one or more supported modes associated with it by default.
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These built-in modes are queried by calling:
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include::../../api/protos/vkGetDisplayModePropertiesKHR.txt[]
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* pname:physicalDevice is the physical device associated with
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pname:display.
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* pname:display is the display to query.
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* pname:pPropertyCount is a pointer to an integer related to the number of
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display modes available or queried, as described below.
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* pname:pProperties is either `NULL` or a pointer to an array of
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sname:VkDisplayModePropertiesKHR structures.
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If pname:pProperties is `NULL`, then the number of display modes available
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on the specified pname:display for pname:physicalDevice is returned in
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pname:pPropertyCount.
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Otherwise, pname:pPropertyCount must: point to a variable set by the user to
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the number of elements in the pname:pProperties array, and on return the
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variable is overwritten with the number of structures actually written to
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pname:pProperties.
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If the value of pname:pPropertyCount is less than the number of display
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modes for pname:physicalDevice, at most pname:pPropertyCount structures will
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be written.
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If pname:pPropertyCount is smaller than the number of display modes
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available on the specified pname:display for pname:physicalDevice,
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ename:VK_INCOMPLETE will be returned instead of ename:VK_SUCCESS to indicate
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that not all the available values were returned.
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include::../../validity/protos/vkGetDisplayModePropertiesKHR.txt[]
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// refBegin VkDisplayModePropertiesKHR - Structure describing display mode properties
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The sname:VkDisplayModePropertiesKHR structure is defined as:
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include::../../api/structs/VkDisplayModePropertiesKHR.txt[]
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* pname:displayMode is a handle to the display mode described in this
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structure.
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This handle will be valid for the lifetime of the Vulkan instance.
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* pname:parameters is a sname:VkDisplayModeParametersKHR structure
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describing the display parameters associated with pname:displayMode.
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include::../../validity/structs/VkDisplayModePropertiesKHR.txt[]
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// refBegin VkDisplayModeParametersKHR - Structure describing display parameters associated with a display mode
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The sname:VkDisplayModeParametersKHR structure is defined as:
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include::../../api/structs/VkDisplayModeParametersKHR.txt[]
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* pname:visibleRegion is the 2D extents of the visible region.
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* pname:refreshRate is a code:uint32_t that is the number of times the
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display is refreshed each second multiplied by 1000.
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[NOTE]
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.Note
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====
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For example, a 60Hz display mode would report a pname:refreshRate of 60,000.
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====
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include::../../validity/structs/VkDisplayModeParametersKHR.txt[]
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// refBegin vkCreateDisplayModeKHR - Create a display mode
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Additional modes may: also be created by calling:
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include::../../api/protos/vkCreateDisplayModeKHR.txt[]
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* pname:physicalDevice is the physical device associated with
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pname:display.
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* pname:display is the display to create an additional mode for.
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* pname:pCreateInfo is a slink:VkDisplayModeCreateInfoKHR structure
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describing the new mode to create.
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* pname:pAllocator is the allocator used for host memory allocated for the
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display mode object when there is no more specific allocator available
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(see <<memory-allocation,Memory Allocation>>).
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* pname:pMode returns the handle of the mode created.
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include::../../validity/protos/vkCreateDisplayModeKHR.txt[]
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// refBegin VkDisplayModeCreateInfoKHR - Structure specifying parameters of a newly created display mode object
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The sname:VkDisplayModeCreateInfoKHR structure is defined as:
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include::../../api/structs/VkDisplayModeCreateInfoKHR.txt[]
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* pname:sType is the type of this structure.
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* pname:pNext is `NULL` or a pointer to an extension-specific structure.
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* pname:flags is reserved for future use, and must: be zero.
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* pname:parameters is a sname:VkDisplayModeParametersKHR structure
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describing the display parameters to use in creating the new mode.
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If the parameters are not compatible with the specified display, the
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implementation must: return ename:VK_ERROR_INITIALIZATION_FAILED.
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.Valid Usage
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****
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* [[VUID-VkDisplayModeCreateInfoKHR-width-01250]]
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The pname:width and pname:height members of the pname:visibleRegion
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member of pname:parameters must: be greater than `0`
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* [[VUID-VkDisplayModeCreateInfoKHR-refreshRate-01251]]
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The pname:refreshRate member of pname:parameters must: be greater than
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`0`
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****
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include::../../validity/structs/VkDisplayModeCreateInfoKHR.txt[]
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// refBegin vkGetDisplayPlaneCapabilitiesKHR - Query capabilities of a mode and plane combination
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Applications that wish to present directly to a display must: select which
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layer, or "plane" of the display they wish to target, and a mode to use with
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the display.
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Each display supports at least one plane.
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The capabilities of a given mode and plane combination are determined by
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calling:
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include::../../api/protos/vkGetDisplayPlaneCapabilitiesKHR.txt[]
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* pname:physicalDevice is the physical device associated with
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pname:display
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* pname:mode is the display mode the application intends to program when
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using the specified plane.
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Note this parameter also implicitly specifies a display.
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* pname:planeIndex is the plane which the application intends to use with
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the display, and is less than the number of display planes supported by
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the device.
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* pname:pCapabilities is a pointer to a
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slink:VkDisplayPlaneCapabilitiesKHR structure in which the capabilities
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are returned.
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include::../../validity/protos/vkGetDisplayPlaneCapabilitiesKHR.txt[]
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// refBegin VkDisplayPlaneCapabilitiesKHR - Structure describing capabilities of a mode and plane combination
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The sname:VkDisplayPlaneCapabilitiesKHR structure is defined as:
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include::../../api/structs/VkDisplayPlaneCapabilitiesKHR.txt[]
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* pname:supportedAlpha is a bitmask of
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elink:VkDisplayPlaneAlphaFlagBitsKHR describing the supported alpha
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blending modes.
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* pname:minSrcPosition is the minimum source rectangle offset supported by
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this plane using the specified mode.
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* pname:maxSrcPosition is the maximum source rectangle offset supported by
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this plane using the specified mode.
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The pname:x and pname:y components of pname:maxSrcPosition must: each be
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greater than or equal to the pname:x and pname:y components of
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pname:minSrcPosition, respectively.
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* pname:minSrcExtent is the minimum source rectangle size supported by
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this plane using the specified mode.
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* pname:maxSrcExtent is the maximum source rectangle size supported by
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this plane using the specified mode.
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* pname:minDstPosition, pname:maxDstPosition, pname:minDstExtent,
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pname:maxDstExtent all have similar semantics to their corresponding
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"Src" equivalents, but apply to the output region within the mode rather
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than the input region within the source image.
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Unlike the "Src" offsets, pname:minDstPosition and pname:maxDstPosition
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may: contain negative values.
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The minimum and maximum position and extent fields describe the hardware
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limits, if any, as they apply to the specified display mode and plane.
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Vendors may: support displaying a subset of a swapchain's presentable images
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on the specified display plane.
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This is expressed by returning pname:minSrcPosition, pname:maxSrcPosition,
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pname:minSrcExtent, and pname:maxSrcExtent values that indicate a range of
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possible positions and sizes may: be used to specify the region within the
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presentable images that source pixels will be read from when creating a
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swapchain on the specified display mode and plane.
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Vendors may: also support mapping the presentable images' content to a
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subset or superset of the visible region in the specified display mode.
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This is expressed by returning pname:minDstPosition, pname:maxDstPosition,
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pname:minDstExtent and pname:maxDstExtent values that indicate a range of
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possible positions and sizes may: be used to describe the region within the
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display mode that the source pixels will be mapped to.
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Other vendors may: support only a 1-1 mapping between pixels in the
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presentable images and the display mode.
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This may: be indicated by returning [eq]#(0,0)# for pname:minSrcPosition,
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pname:maxSrcPosition, pname:minDstPosition, and pname:maxDstPosition, and
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(display mode width, display mode height) for pname:minSrcExtent,
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pname:maxSrcExtent, pname:minDstExtent, and pname:maxDstExtent.
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These values indicate the limits of the hardware's individual fields.
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Not all combinations of values within the offset and extent ranges returned
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in sname:VkDisplayPlaneCapabilitiesKHR are guaranteed to be supported.
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Vendors may: still fail presentation requests that specify unsupported
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combinations.
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include::../../validity/structs/VkDisplayPlaneCapabilitiesKHR.txt[]
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ifdef::VK_EXT_display_control[]
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include::../VK_EXT_display_control/display_control.txt[]
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endif::VK_EXT_display_control[]
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[[wsi-display-surfaces]]
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=== Display Surfaces
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// refBegin vkCreateDisplayPlaneSurfaceKHR - Create a slink:VkSurfaceKHR structure representing a display plane and mode
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A complete display configuration includes a mode, one or more display planes
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and any parameters describing their behavior, and parameters describing some
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aspects of the images associated with those planes.
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Display surfaces describe the configuration of a single plane within a
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complete display configuration.
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To create a sname:VkSurfaceKHR structure for a display surface, call:
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include::../../api/protos/vkCreateDisplayPlaneSurfaceKHR.txt[]
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* pname:instance is the instance corresponding to the physical device the
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targeted display is on.
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* pname:pCreateInfo is a pointer to an instance of the
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slink:VkDisplaySurfaceCreateInfoKHR structure specifying which mode,
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plane, and other parameters to use, as described below.
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* pname:pAllocator is the allocator used for host memory allocated for the
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surface object when there is no more specific allocator available (see
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<<memory-allocation,Memory Allocation>>).
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* pname:pSurface points to a sname:VkSurfaceKHR handle in which the
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created surface is returned.
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include::../../validity/protos/vkCreateDisplayPlaneSurfaceKHR.txt[]
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// refBegin VkDisplaySurfaceCreateInfoKHR - Structure specifying parameters of a newly created display plane surface object
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The sname:VkDisplaySurfaceCreateInfoKHR structure is defined as:
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include::../../api/structs/VkDisplaySurfaceCreateInfoKHR.txt[]
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* pname:sType is the type of this structure.
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* pname:pNext is `NULL` or a pointer to an extension-specific structure.
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* pname:flags is reserved for future use, and must: be zero.
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* pname:displayMode is a slink:VkDisplayModeKHR handle specifying the mode
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to use when displaying this surface.
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* pname:planeIndex is the plane on which this surface appears.
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* pname:planeStackIndex is the z-order of the plane.
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* pname:transform is a elink:VkSurfaceTransformFlagBitsKH value specifying
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the transformation to apply to images as part of the scanout operation.
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* pname:globalAlpha is the global alpha value.
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This value is ignored if pname:alphaMode is not
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ename:VK_DISPLAY_PLANE_ALPHA_GLOBAL_BIT_KHR.
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* pname:alphaMode is a elink:VkDisplayPlaneAlphaFlagBitsKHR value
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specifying the type of alpha blending to use.
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|
* pname:imageExtent The size of the presentable images to use with the
|
|
surface.
|
|
|
|
[NOTE]
|
|
.Note
|
|
====
|
|
Creating a display surface must: not modify the state of the displays,
|
|
planes, or other resources it names.
|
|
For example, it must: not apply the specified mode to be set on the
|
|
associated display.
|
|
Application of display configuration occurs as a side effect of presenting
|
|
to a display surface.
|
|
====
|
|
|
|
.Valid Usage
|
|
****
|
|
* [[VUID-VkDisplaySurfaceCreateInfoKHR-planeIndex-01252]]
|
|
pname:planeIndex must: be less than the number of display planes
|
|
supported by the device as determined by calling
|
|
fname:vkGetPhysicalDeviceDisplayPlanePropertiesKHR
|
|
* [[VUID-VkDisplaySurfaceCreateInfoKHR-planeReorderPossible-01253]]
|
|
If the pname:planeReorderPossible member of the
|
|
sname:VkDisplayPropertiesKHR structure returned by
|
|
fname:vkGetPhysicalDeviceDisplayPropertiesKHR for the display
|
|
corresponding to pname:displayMode is ename:VK_TRUE then
|
|
pname:planeStackIndex must: be less than the number of display planes
|
|
supported by the device as determined by calling
|
|
fname:vkGetPhysicalDeviceDisplayPlanePropertiesKHR; otherwise
|
|
pname:planeStackIndex must: equal the pname:currentStackIndex member of
|
|
sname:VkDisplayPlanePropertiesKHR returned by
|
|
fname:vkGetPhysicalDeviceDisplayPlanePropertiesKHR for the display plane
|
|
corresponding to pname:displayMode
|
|
* [[VUID-VkDisplaySurfaceCreateInfoKHR-alphaMode-01254]]
|
|
If pname:alphaMode is ename:VK_DISPLAY_PLANE_ALPHA_GLOBAL_BIT_KHR then
|
|
pname:globalAlpha must: be between `0` and `1`, inclusive
|
|
* [[VUID-VkDisplaySurfaceCreateInfoKHR-alphaMode-01255]]
|
|
pname:alphaMode must: be `0` or one of the bits present in the
|
|
pname:supportedAlpha member of sname:VkDisplayPlaneCapabilitiesKHR
|
|
returned by fname:vkGetDisplayPlaneCapabilitiesKHR for the display plane
|
|
corresponding to pname:displayMode
|
|
* [[VUID-VkDisplaySurfaceCreateInfoKHR-width-01256]]
|
|
The pname:width and pname:height members of pname:imageExtent must: be
|
|
less than the pname:maxImageDimensions2D member of
|
|
sname:VkPhysicalDeviceLimits
|
|
****
|
|
|
|
include::../../validity/structs/VkDisplaySurfaceCreateInfoKHR.txt[]
|
|
|
|
// refBegin VkDisplayPlaneAlphaFlagBitsKHR - Alpha blending type
|
|
|
|
Possible values of slink:VkDisplaySurfaceCreateInfoKHR::pname:alphaMode,
|
|
specifying the type of alpha blending to use on a display, are:
|
|
|
|
include::../../api/enums/VkDisplayPlaneAlphaFlagBitsKHR.txt[]
|
|
|
|
* ename:VK_DISPLAY_PLANE_ALPHA_OPAQUE_BIT_KHR specifies that the source
|
|
image will be treated as opaque.
|
|
* ename:VK_DISPLAY_PLANE_ALPHA_GLOBAL_BIT_KHR specifies that a global
|
|
alpha value must: be specified that will be applied to all pixels in the
|
|
source image.
|
|
* ename:VK_DISPLAY_PLANE_ALPHA_PER_PIXEL_BIT_KHR specifies that the alpha
|
|
value will be determined by the alpha channel of the source image's
|
|
pixels.
|
|
If the source format contains no alpha values, no blending will be
|
|
applied.
|
|
The source alpha values are not premultiplied into the source image's
|
|
other color channels.
|
|
* ename:VK_DISPLAY_PLANE_ALPHA_PER_PIXEL_PREMULTIPLIED_BIT_KHR is
|
|
equivalent to ename:VK_DISPLAY_PLANE_ALPHA_PER_PIXEL_BIT_KHR, except the
|
|
source alpha values are assumed to be premultiplied into the source
|
|
image's other color channels.
|
|
|
|
// refEnd VkDisplayPlaneAlphaFlagBitsKHR
|