r.DefaultBackBufferPixelFormat
r.DefaultBackBufferPixelFormat
#Overview
name: r.DefaultBackBufferPixelFormat
The value of this variable can be defined or overridden in .ini config files. 2 .ini config files referencing this setting variable.
This variable is created as a Console Variable (cvar).
- type:
Var - help:
Defines the default back buffer pixel format.\n 0: 8bit RGBA\n 1: 16bit RGBA\n 2: Float RGB\n 3: Float RGBA\n 4: 10bit RGB, 2bit Alpha\n
It is referenced in 24 C++ source files.
#Summary
#Usage in the C++ source code
The purpose of r.DefaultBackBufferPixelFormat is to define the default pixel format for the back buffer in Unreal Engine’s rendering system. This setting variable is used to specify the color depth and format of the render target that the engine uses for final output to the display.
-
The variable r.DefaultBackBufferPixelFormat is primarily used in the rendering subsystem of Unreal Engine, specifically in the RHI (Rendering Hardware Interface) implementations for various graphics APIs like D3D11, D3D12, and Vulkan.
-
The value of this variable is set through the console variable system. It’s defined as an integer with default value 4, which corresponds to different pixel formats depending on the implementation.
-
This variable interacts closely with the EDefaultBackBufferPixelFormat enum and its conversion functions. It’s often used in conjunction with EPixelFormat to determine the appropriate format for rendering targets.
-
Developers should be aware that changing this variable can affect rendering quality, performance, and compatibility. Not all pixel formats are supported on all hardware or rendering APIs.
-
Best practices include:
- Only changing this value if you have a specific need for a different pixel format.
- Ensuring that the chosen format is supported by the target hardware and rendering API.
- Testing thoroughly after changing this value, as it can impact the entire rendering pipeline.
The associated variable CVarDefaultBackBufferPixelFormat is used to access the value of r.DefaultBackBufferPixelFormat throughout the engine code. It’s typically defined as a static const auto variable within functions that need to use this setting. This variable is used in the same way as r.DefaultBackBufferPixelFormat, but provides a convenient way to access the console variable’s value without having to look it up each time.
When using CVarDefaultBackBufferPixelFormat, developers should:
- Be aware that it’s accessing a global setting that could potentially be changed at runtime.
- Use the appropriate thread-safe getter method (GetValueOnGameThread, GetValueOnRenderThread, etc.) depending on the context where it’s being accessed.
- Consider caching the value if it’s being used frequently in performance-critical code, as looking up console variables can have some overhead.
#Setting Variables
#References In INI files
Location: <Workspace>/Engine/Config/BaseDeviceProfiles.ini:303, section: [IOS DeviceProfile]
- INI Section:
IOS DeviceProfile - Raw value:
0 - Is Array:
False
Location: <Workspace>/Engine/Config/BaseDeviceProfiles.ini:804, section: [Android DeviceProfile]
- INI Section:
Android DeviceProfile - Raw value:
0 - Is Array:
False
#References in C++ code
#Callsites
This variable is referenced in the following C++ source code:
#Loc: <Workspace>/Engine/Source/Runtime/Renderer/Private/SceneTextures.cpp:66
Scope: file
Source code excerpt:
static TAutoConsoleVariable<int32> CVarDefaultBackBufferPixelFormat(
TEXT("r.DefaultBackBufferPixelFormat"),
4,
TEXT("Defines the default back buffer pixel format.\n")
TEXT(" 0: 8bit RGBA\n")
TEXT(" 1: 16bit RGBA\n")
TEXT(" 2: Float RGB\n")
TEXT(" 3: Float RGBA\n")
#Loc: <Workspace>/Engine/Plugins/Media/MediaIOFramework/Source/MediaIOCore/Private/FileMediaOutput.cpp:65
Scope (from outer to inner):
file
function EPixelFormat UFileMediaOutput::GetRequestedPixelFormat
Source code excerpt:
}
static const auto CVarDefaultBackBufferPixelFormat = IConsoleManager::Get().FindTConsoleVariableDataInt(TEXT("r.DefaultBackBufferPixelFormat"));
EPixelFormat SceneTargetFormat = EDefaultBackBufferPixelFormat::Convert2PixelFormat(EDefaultBackBufferPixelFormat::FromInt(CVarDefaultBackBufferPixelFormat->GetValueOnAnyThread()));
if (WriteOptions.Format == EDesiredImageFormat::EXR)
{
return SceneTargetFormat == EPixelFormat::PF_A2B10G10R10 ? PF_B8G8R8A8 : SceneTargetFormat;
}
#Loc: <Workspace>/Engine/Plugins/Media/MediaIOFramework/Source/MediaIOCore/Private/MediaCaptureSources.h:72
Scope (from outer to inner):
file
namespace UE::MediaCapture::Private
function bool ValidateSceneViewport
Source code excerpt:
}
static const auto CVarDefaultBackBufferPixelFormat = IConsoleManager::Get().FindTConsoleVariableDataInt(TEXT("r.DefaultBackBufferPixelFormat"));
EPixelFormat SceneTargetFormat = EDefaultBackBufferPixelFormat::Convert2PixelFormat(EDefaultBackBufferPixelFormat::FromInt(CVarDefaultBackBufferPixelFormat->GetValueOnGameThread()));
if (DesiredPixelFormat != SceneTargetFormat)
{
if (!UMediaCapture::GetSupportedRgbaSwizzleFormats().Contains(SceneTargetFormat) || !CaptureOptions.bConvertToDesiredPixelFormat)
{
UE_LOG(LogMediaIOCore, Error, TEXT("Can not %s the capture. The Render Target pixel format doesn't match with the requested pixel format. %sRenderTarget: %s MediaOutput: %s")
#Loc: <Workspace>/Engine/Plugins/Runtime/nDisplay/Source/SharedMemoryMedia/Private/SharedMemoryMediaOutput.cpp:27
Scope (from outer to inner):
file
function EPixelFormat USharedMemoryMediaOutput::GetRequestedPixelFormat
Source code excerpt:
// @todo is there a way to not have the MF render target allocated since we're not using it ?
static const auto CVarDefaultBackBufferPixelFormat = IConsoleManager::Get().FindTConsoleVariableDataInt(TEXT("r.DefaultBackBufferPixelFormat"));
return EDefaultBackBufferPixelFormat::Convert2PixelFormat(EDefaultBackBufferPixelFormat::FromInt(CVarDefaultBackBufferPixelFormat->GetValueOnGameThread()));
}
EMediaCaptureConversionOperation USharedMemoryMediaOutput::GetConversionOperation(EMediaCaptureSourceType InSourceType) const
{
return EMediaCaptureConversionOperation::CUSTOM;
#Loc: <Workspace>/Engine/Source/Runtime/D3D12RHI/Private/D3D12Viewport.cpp:810
Scope (from outer to inner):
file
function EPixelFormat GetDefaultBackBufferPixelFormat
Source code excerpt:
EPixelFormat GetDefaultBackBufferPixelFormat()
{
static const auto CVarDefaultBackBufferPixelFormat = IConsoleManager::Get().FindTConsoleVariableDataInt(TEXT("r.DefaultBackBufferPixelFormat"));
return EDefaultBackBufferPixelFormat::Convert2PixelFormat(EDefaultBackBufferPixelFormat::FromInt(CVarDefaultBackBufferPixelFormat->GetValueOnGameThread()));
}
/*==============================================================================
* The following RHI functions must be called from the main thread.
*=============================================================================*/
#Loc: <Workspace>/Engine/Source/Runtime/D3D12RHI/Private/D3D12Viewport.cpp:846
Scope (from outer to inner):
file
function void FD3D12DynamicRHI::RHIResizeViewport
Source code excerpt:
if (PreferredPixelFormat == EPixelFormat::PF_Unknown)
{
static const auto CVarDefaultBackBufferPixelFormat = IConsoleManager::Get().FindTConsoleVariableDataInt(TEXT("r.DefaultBackBufferPixelFormat"));
PreferredPixelFormat = EDefaultBackBufferPixelFormat::Convert2PixelFormat(EDefaultBackBufferPixelFormat::FromInt(CVarDefaultBackBufferPixelFormat->GetValueOnGameThread()));
}
FD3D12Viewport* Viewport = FD3D12DynamicRHI::ResourceCast(ViewportRHI);
Viewport->Resize(SizeX, SizeY, bIsFullscreen, PreferredPixelFormat);
}
#Loc: <Workspace>/Engine/Source/Runtime/Engine/Private/Slate/SceneViewport.cpp:2076
Scope (from outer to inner):
file
function void FSceneViewport::InitRHI
Source code excerpt:
TArray<FTexture2DRHIRef> BufferedSRVRHI;
static const auto CVarDefaultBackBufferPixelFormat = IConsoleManager::Get().FindTConsoleVariableDataInt(TEXT("r.DefaultBackBufferPixelFormat"));
EPixelFormat SceneTargetFormat = EDefaultBackBufferPixelFormat::Convert2PixelFormat(EDefaultBackBufferPixelFormat::FromInt(CVarDefaultBackBufferPixelFormat->GetValueOnRenderThread()));
SceneTargetFormat = RHIPreferredPixelFormatHint(SceneTargetFormat);
if (bHDRViewport)
{
SceneTargetFormat = GRHIHDRDisplayOutputFormat;
#Loc: <Workspace>/Engine/Source/Runtime/VulkanRHI/Private/VulkanSwapChain.cpp:202
Scope (from outer to inner):
file
function FVulkanSwapChain::FVulkanSwapChain
Source code excerpt:
if (InOutPixelFormat == PF_Unknown)
{
static const auto* CVarDefaultBackBufferPixelFormat = IConsoleManager::Get().FindTConsoleVariableDataInt(TEXT("r.DefaultBackBufferPixelFormat"));
InOutPixelFormat = CVarDefaultBackBufferPixelFormat ? EDefaultBackBufferPixelFormat::Convert2PixelFormat(EDefaultBackBufferPixelFormat::FromInt(CVarDefaultBackBufferPixelFormat->GetValueOnGameThread())) : PF_Unknown;
}
if (InOutPixelFormat != PF_Unknown)
{
bool bFound = false;
#Loc: <Workspace>/Engine/Source/Runtime/VulkanRHI/Private/VulkanViewport.cpp:1116
Scope (from outer to inner):
file
function FViewportRHIRef FVulkanDynamicRHI::RHICreateViewport
Source code excerpt:
if (PreferredPixelFormat == PF_Unknown)
{
static const auto* CVarDefaultBackBufferPixelFormat = IConsoleManager::Get().FindTConsoleVariableDataInt(TEXT("r.DefaultBackBufferPixelFormat"));
PreferredPixelFormat = EDefaultBackBufferPixelFormat::Convert2PixelFormat(EDefaultBackBufferPixelFormat::FromInt(CVarDefaultBackBufferPixelFormat->GetValueOnAnyThread()));
}
return new FVulkanViewport(Device, WindowHandle, SizeX, SizeY, bIsFullscreen, PreferredPixelFormat);
}
#Loc: <Workspace>/Engine/Source/Runtime/VulkanRHI/Private/VulkanViewport.cpp:1131
Scope (from outer to inner):
file
function void FVulkanDynamicRHI::RHIResizeViewport
Source code excerpt:
if (PreferredPixelFormat == PF_Unknown)
{
static const auto* CVarDefaultBackBufferPixelFormat = IConsoleManager::Get().FindTConsoleVariableDataInt(TEXT("r.DefaultBackBufferPixelFormat"));
PreferredPixelFormat = EDefaultBackBufferPixelFormat::Convert2PixelFormat(EDefaultBackBufferPixelFormat::FromInt(CVarDefaultBackBufferPixelFormat->GetValueOnAnyThread()));
}
if (Viewport->GetSizeXY() != FIntPoint(SizeX, SizeY) || Viewport->IsFullscreen() != bIsFullscreen)
{
FlushRenderingCommands();
#Loc: <Workspace>/Engine/Source/Runtime/Windows/D3D11RHI/Private/D3D11Viewport.cpp:667
Scope (from outer to inner):
file
function FViewportRHIRef FD3D11DynamicRHI::RHICreateViewport
Source code excerpt:
if (PreferredPixelFormat == EPixelFormat::PF_Unknown)
{
static const auto CVarDefaultBackBufferPixelFormat = IConsoleManager::Get().FindTConsoleVariableDataInt(TEXT("r.DefaultBackBufferPixelFormat"));
PreferredPixelFormat = EDefaultBackBufferPixelFormat::Convert2PixelFormat(EDefaultBackBufferPixelFormat::FromInt(CVarDefaultBackBufferPixelFormat->GetValueOnGameThread()));
}
return new FD3D11Viewport(this,(HWND)WindowHandle,SizeX,SizeY,bIsFullscreen,PreferredPixelFormat);
}
#Loc: <Workspace>/Engine/Source/Runtime/Windows/D3D11RHI/Private/D3D11Viewport.cpp:689
Scope (from outer to inner):
file
function void FD3D11DynamicRHI::RHIResizeViewport
Source code excerpt:
if (PreferredPixelFormat == EPixelFormat::PF_Unknown)
{
static const auto CVarDefaultBackBufferPixelFormat = IConsoleManager::Get().FindTConsoleVariableDataInt(TEXT("r.DefaultBackBufferPixelFormat"));
PreferredPixelFormat = EDefaultBackBufferPixelFormat::Convert2PixelFormat(EDefaultBackBufferPixelFormat::FromInt(CVarDefaultBackBufferPixelFormat->GetValueOnGameThread()));
}
FD3D11Viewport* Viewport = ResourceCast(ViewportRHI);
Viewport->Resize(SizeX, SizeY, bIsFullscreen, PreferredPixelFormat);
}
#Associated Variable and Callsites
This variable is associated with another variable named CVarDefaultBackBufferPixelFormat. They share the same value. See the following C++ source code.
#Loc: <Workspace>/Engine/Plugins/Media/MediaIOFramework/Source/MediaIOCore/Private/FileMediaOutput.cpp:65
Scope (from outer to inner):
file
function EPixelFormat UFileMediaOutput::GetRequestedPixelFormat
Source code excerpt:
}
static const auto CVarDefaultBackBufferPixelFormat = IConsoleManager::Get().FindTConsoleVariableDataInt(TEXT("r.DefaultBackBufferPixelFormat"));
EPixelFormat SceneTargetFormat = EDefaultBackBufferPixelFormat::Convert2PixelFormat(EDefaultBackBufferPixelFormat::FromInt(CVarDefaultBackBufferPixelFormat->GetValueOnAnyThread()));
if (WriteOptions.Format == EDesiredImageFormat::EXR)
{
return SceneTargetFormat == EPixelFormat::PF_A2B10G10R10 ? PF_B8G8R8A8 : SceneTargetFormat;
}
else
#Loc: <Workspace>/Engine/Plugins/Media/MediaIOFramework/Source/MediaIOCore/Private/MediaCaptureSources.h:72
Scope (from outer to inner):
file
namespace UE::MediaCapture::Private
function bool ValidateSceneViewport
Source code excerpt:
}
static const auto CVarDefaultBackBufferPixelFormat = IConsoleManager::Get().FindTConsoleVariableDataInt(TEXT("r.DefaultBackBufferPixelFormat"));
EPixelFormat SceneTargetFormat = EDefaultBackBufferPixelFormat::Convert2PixelFormat(EDefaultBackBufferPixelFormat::FromInt(CVarDefaultBackBufferPixelFormat->GetValueOnGameThread()));
if (DesiredPixelFormat != SceneTargetFormat)
{
if (!UMediaCapture::GetSupportedRgbaSwizzleFormats().Contains(SceneTargetFormat) || !CaptureOptions.bConvertToDesiredPixelFormat)
{
UE_LOG(LogMediaIOCore, Error, TEXT("Can not %s the capture. The Render Target pixel format doesn't match with the requested pixel format. %sRenderTarget: %s MediaOutput: %s")
, bCurrentlyCapturing ? TEXT("continue") : TEXT("start")
#Loc: <Workspace>/Engine/Plugins/Runtime/nDisplay/Source/SharedMemoryMedia/Private/SharedMemoryMediaOutput.cpp:27
Scope (from outer to inner):
file
function EPixelFormat USharedMemoryMediaOutput::GetRequestedPixelFormat
Source code excerpt:
// @todo is there a way to not have the MF render target allocated since we're not using it ?
static const auto CVarDefaultBackBufferPixelFormat = IConsoleManager::Get().FindTConsoleVariableDataInt(TEXT("r.DefaultBackBufferPixelFormat"));
return EDefaultBackBufferPixelFormat::Convert2PixelFormat(EDefaultBackBufferPixelFormat::FromInt(CVarDefaultBackBufferPixelFormat->GetValueOnGameThread()));
}
EMediaCaptureConversionOperation USharedMemoryMediaOutput::GetConversionOperation(EMediaCaptureSourceType InSourceType) const
{
return EMediaCaptureConversionOperation::CUSTOM;
}
#Loc: <Workspace>/Engine/Source/Runtime/D3D12RHI/Private/D3D12Viewport.cpp:810
Scope (from outer to inner):
file
function EPixelFormat GetDefaultBackBufferPixelFormat
Source code excerpt:
EPixelFormat GetDefaultBackBufferPixelFormat()
{
static const auto CVarDefaultBackBufferPixelFormat = IConsoleManager::Get().FindTConsoleVariableDataInt(TEXT("r.DefaultBackBufferPixelFormat"));
return EDefaultBackBufferPixelFormat::Convert2PixelFormat(EDefaultBackBufferPixelFormat::FromInt(CVarDefaultBackBufferPixelFormat->GetValueOnGameThread()));
}
/*==============================================================================
* The following RHI functions must be called from the main thread.
*=============================================================================*/
FViewportRHIRef FD3D12DynamicRHI::RHICreateViewport(void* WindowHandle, uint32 SizeX, uint32 SizeY, bool bIsFullscreen, EPixelFormat PreferredPixelFormat)
#Loc: <Workspace>/Engine/Source/Runtime/D3D12RHI/Private/D3D12Viewport.cpp:846
Scope (from outer to inner):
file
function void FD3D12DynamicRHI::RHIResizeViewport
Source code excerpt:
if (PreferredPixelFormat == EPixelFormat::PF_Unknown)
{
static const auto CVarDefaultBackBufferPixelFormat = IConsoleManager::Get().FindTConsoleVariableDataInt(TEXT("r.DefaultBackBufferPixelFormat"));
PreferredPixelFormat = EDefaultBackBufferPixelFormat::Convert2PixelFormat(EDefaultBackBufferPixelFormat::FromInt(CVarDefaultBackBufferPixelFormat->GetValueOnGameThread()));
}
FD3D12Viewport* Viewport = FD3D12DynamicRHI::ResourceCast(ViewportRHI);
Viewport->Resize(SizeX, SizeY, bIsFullscreen, PreferredPixelFormat);
}
#Loc: <Workspace>/Engine/Source/Runtime/Engine/Private/Slate/SceneViewport.cpp:2076
Scope (from outer to inner):
file
function void FSceneViewport::InitRHI
Source code excerpt:
TArray<FTexture2DRHIRef> BufferedSRVRHI;
static const auto CVarDefaultBackBufferPixelFormat = IConsoleManager::Get().FindTConsoleVariableDataInt(TEXT("r.DefaultBackBufferPixelFormat"));
EPixelFormat SceneTargetFormat = EDefaultBackBufferPixelFormat::Convert2PixelFormat(EDefaultBackBufferPixelFormat::FromInt(CVarDefaultBackBufferPixelFormat->GetValueOnRenderThread()));
SceneTargetFormat = RHIPreferredPixelFormatHint(SceneTargetFormat);
if (bHDRViewport)
{
SceneTargetFormat = GRHIHDRDisplayOutputFormat;
}
#Loc: <Workspace>/Engine/Source/Runtime/Renderer/Private/SceneTextures.cpp:65
Scope: file
Source code excerpt:
ECVF_RenderThreadSafe);
static TAutoConsoleVariable<int32> CVarDefaultBackBufferPixelFormat(
TEXT("r.DefaultBackBufferPixelFormat"),
4,
TEXT("Defines the default back buffer pixel format.\n")
TEXT(" 0: 8bit RGBA\n")
TEXT(" 1: 16bit RGBA\n")
TEXT(" 2: Float RGB\n")
#Loc: <Workspace>/Engine/Source/Runtime/VulkanRHI/Private/VulkanSwapChain.cpp:202
Scope (from outer to inner):
file
function FVulkanSwapChain::FVulkanSwapChain
Source code excerpt:
if (InOutPixelFormat == PF_Unknown)
{
static const auto* CVarDefaultBackBufferPixelFormat = IConsoleManager::Get().FindTConsoleVariableDataInt(TEXT("r.DefaultBackBufferPixelFormat"));
InOutPixelFormat = CVarDefaultBackBufferPixelFormat ? EDefaultBackBufferPixelFormat::Convert2PixelFormat(EDefaultBackBufferPixelFormat::FromInt(CVarDefaultBackBufferPixelFormat->GetValueOnGameThread())) : PF_Unknown;
}
if (InOutPixelFormat != PF_Unknown)
{
bool bFound = false;
if (GPixelFormats[InOutPixelFormat].Supported)
#Loc: <Workspace>/Engine/Source/Runtime/VulkanRHI/Private/VulkanViewport.cpp:1116
Scope (from outer to inner):
file
function FViewportRHIRef FVulkanDynamicRHI::RHICreateViewport
Source code excerpt:
if (PreferredPixelFormat == PF_Unknown)
{
static const auto* CVarDefaultBackBufferPixelFormat = IConsoleManager::Get().FindTConsoleVariableDataInt(TEXT("r.DefaultBackBufferPixelFormat"));
PreferredPixelFormat = EDefaultBackBufferPixelFormat::Convert2PixelFormat(EDefaultBackBufferPixelFormat::FromInt(CVarDefaultBackBufferPixelFormat->GetValueOnAnyThread()));
}
return new FVulkanViewport(Device, WindowHandle, SizeX, SizeY, bIsFullscreen, PreferredPixelFormat);
}
void FVulkanDynamicRHI::RHIResizeViewport(FRHIViewport* ViewportRHI, uint32 SizeX, uint32 SizeY, bool bIsFullscreen, EPixelFormat PreferredPixelFormat)
#Loc: <Workspace>/Engine/Source/Runtime/VulkanRHI/Private/VulkanViewport.cpp:1131
Scope (from outer to inner):
file
function void FVulkanDynamicRHI::RHIResizeViewport
Source code excerpt:
if (PreferredPixelFormat == PF_Unknown)
{
static const auto* CVarDefaultBackBufferPixelFormat = IConsoleManager::Get().FindTConsoleVariableDataInt(TEXT("r.DefaultBackBufferPixelFormat"));
PreferredPixelFormat = EDefaultBackBufferPixelFormat::Convert2PixelFormat(EDefaultBackBufferPixelFormat::FromInt(CVarDefaultBackBufferPixelFormat->GetValueOnAnyThread()));
}
if (Viewport->GetSizeXY() != FIntPoint(SizeX, SizeY) || Viewport->IsFullscreen() != bIsFullscreen)
{
FlushRenderingCommands();
#Loc: <Workspace>/Engine/Source/Runtime/Windows/D3D11RHI/Private/D3D11Viewport.cpp:667
Scope (from outer to inner):
file
function FViewportRHIRef FD3D11DynamicRHI::RHICreateViewport
Source code excerpt:
if (PreferredPixelFormat == EPixelFormat::PF_Unknown)
{
static const auto CVarDefaultBackBufferPixelFormat = IConsoleManager::Get().FindTConsoleVariableDataInt(TEXT("r.DefaultBackBufferPixelFormat"));
PreferredPixelFormat = EDefaultBackBufferPixelFormat::Convert2PixelFormat(EDefaultBackBufferPixelFormat::FromInt(CVarDefaultBackBufferPixelFormat->GetValueOnGameThread()));
}
return new FD3D11Viewport(this,(HWND)WindowHandle,SizeX,SizeY,bIsFullscreen,PreferredPixelFormat);
}
void FD3D11DynamicRHI::RHIResizeViewport(FRHIViewport* ViewportRHI,uint32 SizeX,uint32 SizeY,bool bIsFullscreen)
#Loc: <Workspace>/Engine/Source/Runtime/Windows/D3D11RHI/Private/D3D11Viewport.cpp:689
Scope (from outer to inner):
file
function void FD3D11DynamicRHI::RHIResizeViewport
Source code excerpt:
if (PreferredPixelFormat == EPixelFormat::PF_Unknown)
{
static const auto CVarDefaultBackBufferPixelFormat = IConsoleManager::Get().FindTConsoleVariableDataInt(TEXT("r.DefaultBackBufferPixelFormat"));
PreferredPixelFormat = EDefaultBackBufferPixelFormat::Convert2PixelFormat(EDefaultBackBufferPixelFormat::FromInt(CVarDefaultBackBufferPixelFormat->GetValueOnGameThread()));
}
FD3D11Viewport* Viewport = ResourceCast(ViewportRHI);
Viewport->Resize(SizeX, SizeY, bIsFullscreen, PreferredPixelFormat);
}