- Qt 6.11
- Qt Quick
- C++ Classes
- QQuickGraphicsDevice
- Qt 6.11.2 Reference Documentation

# QQuickGraphicsDevice Class

The QQuickGraphicsDevice class provides an opaque container for native graphics objects representing graphics devices or contexts. More...

Header: | `#include <QQuickGraphicsDevice>`
CMake: | `find_package(Qt6 REQUIRED COMPONENTS Quick)` `target_link_libraries(mytarget PRIVATE Qt6::Quick)`
qmake: | `QT += quick`
Since: | Qt 6.0

- List of all members, including inherited members

## Public Functions

| QQuickGraphicsDevice()
| ~QQuickGraphicsDevice()
bool | isNull() const

## Static Public Members

QQuickGraphicsDevice | fromAdapter(quint32 adapterLuidLow, qint32 adapterLuidHigh, int featureLevel = 0)
QQuickGraphicsDevice | fromDeviceAndCommandQueue(MTLDevice *device, MTLCommandQueue *commandQueue)
QQuickGraphicsDevice | fromDeviceAndContext(void *device, void *context)
QQuickGraphicsDevice | fromDeviceObjects(VkPhysicalDevice physicalDevice, VkDevice device, int queueFamilyIndex, int queueIndex = 0)
QQuickGraphicsDevice | fromOpenGLContext(QOpenGLContext *context)
QQuickGraphicsDevice | fromPhysicalDevice(VkPhysicalDevice physicalDevice)
`(since 6.6)` QQuickGraphicsDevice | fromRhi(QRhi *rhi)
`(since 6.10)` QQuickGraphicsDevice | fromRhiAdapter(QRhiAdapter *adapter)

## Detailed Description

See also QQuickWindow::setGraphicsDevice() and QQuickRenderTarget.

## Member Function Documentation

### QQuickGraphicsDevice::QQuickGraphicsDevice()

Constructs a default QQuickGraphicsDevice that does not reference any native objects.

### `[noexcept]` QQuickGraphicsDevice::~QQuickGraphicsDevice()

Destructor.

### `[static]` QQuickGraphicsDevice QQuickGraphicsDevice::fromAdapter(quint32 adapterLuidLow, qint32 adapterLuidHigh, int featureLevel = 0)

Returns a new QQuickGraphicsDevice describing a DXGI adapter and D3D feature level.

This factory function is suitable for Direct3D 11 and 12, particularly in combination with OpenXR. adapterLuidLow and adapterLuidHigh together specify a LUID, while a featureLevel specifies a `D3D_FEATURE_LEVEL_` value. featureLevel can be set to 0 if it is not intended to be specified, in which case the scene graph's defaults will be used.

Note: With Direct 3D 12 featureLevel specifies the `minimum` feature level passed on to D3D12CreateDevice().

### `[static]` QQuickGraphicsDevice QQuickGraphicsDevice::fromDeviceAndCommandQueue(MTLDevice *device, MTLCommandQueue *commandQueue)

Returns a new QQuickGraphicsDevice referencing an existing device and commandQueue object.

This factory function is suitable for Metal.

Note: the resulting QQuickGraphicsDevice does not own any native resources, it merely contains references. It is the caller's responsibility to ensure that the native resource exists as long as necessary.

### `[static]` QQuickGraphicsDevice QQuickGraphicsDevice::fromDeviceAndContext(void *device, void *context)

Returns a new QQuickGraphicsDevice referencing a native device and context object.

This factory function is suitable for Direct3D 11. device is expected to be a `ID3D11Device*`, context is expected to be a `ID3D11DeviceContext*`.

It also supports Direct 3D 12, if that is the 3D API used at run time. With D3D12 context is unused and can be set to null. device is expected to be a `ID3D12Device*`.

Note: the resulting QQuickGraphicsDevice does not own any native resources, it merely contains references. It is the caller's responsibility to ensure that the native resource exists as long as necessary.

### `[static]` QQuickGraphicsDevice QQuickGraphicsDevice::fromDeviceObjects(VkPhysicalDevice physicalDevice, VkDevice device, int queueFamilyIndex, int queueIndex = 0)

Returns a new QQuickGraphicsDevice referencing an existing device object.

This factory function is suitable for Vulkan. physicalDevice, device and queueFamilyIndex must always be provided. queueIndex is optional since the default value of 0 is often suitable.

Note: the resulting QQuickGraphicsDevice does not own any native resources, it merely contains references. It is the caller's responsibility to ensure that the native resource exists as long as necessary.

### `[static]` QQuickGraphicsDevice QQuickGraphicsDevice::fromOpenGLContext(QOpenGLContext *context)

Returns a new QQuickGraphicsDevice referencing an existing OpenGL context.

This factory function is suitable for OpenGL.

Note: It is up the caller to ensure that context is going to be compatible and usable with the QQuickWindow. Platform-specific mismatches in the associated QSurfaceFormat, or threading issues due to attempting to use context on multiple threads are up to the caller to avoid.

### `[static]` QQuickGraphicsDevice QQuickGraphicsDevice::fromPhysicalDevice(VkPhysicalDevice physicalDevice)

Returns a new QQuickGraphicsDevice referencing an existing physicalDevice.

This factory function is suitable for Vulkan, particularly in combination with OpenXR.

Note: the resulting QQuickGraphicsDevice does not own any native resources, it merely contains references. It is the caller's responsibility to ensure that the native resource exists as long as necessary.

### `[static, since 6.6]` QQuickGraphicsDevice QQuickGraphicsDevice::fromRhi(QRhi *rhi)

Returns a new QQuickGraphicsDevice referencing an existing rhi object.

Note: Similarly to fromOpenGLContext(), the caller must be careful to only share a QRhi (and so the underlying graphics context or device) between QQuickWindows that are known to be compatible, not breaking the underlying graphics API's rules when it comes to threading, pixel formats, etc.

This function was introduced in Qt 6.6.

### `[static, since 6.10]` QQuickGraphicsDevice QQuickGraphicsDevice::fromRhiAdapter(QRhiAdapter *adapter)

Returns a new QQuickGraphicsDevice referencing an existing adapter QRhiAdapter object.

Not applicable to QRhi backends and graphics APIs where QRhiAdapter does not have a real implementation.

Equivalent to fromAdapter() for Direct 3D, and fromPhysicalDevice() for Vulkan.

Note: Ownership is not taken for adapter, and it must stay valid at minimum until the scene graph intializes, which most likely happens when the associated QQuickWindow becomes exposed.

This function was introduced in Qt 6.10.

See also QRhi::enumerateAdapters().

### bool QQuickGraphicsDevice::isNull() const

Returns true if this is a default constructed graphics device that does not reference any native objects.