* implemented Buffer, BufferView, CommandBuffer, CommandPool, DeviceMemory, Image, ImageView and Queue

hace 10 años · 0bcfe56b08
--- a/projects/triangle/triangle.lpi
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      </Position30>
    </JumpHistory>
  </ProjectSession>
  <Debugging>
    <BreakPoints Count="1">
      <Item1>
        <Kind Value="bpkSource"/>
        <WatchScope Value="wpsLocal"/>
        <WatchKind Value="wpkWrite"/>
        <Source Value="uMainForm.pas"/>
        <Line Value="203"/>
      </Item1>
    </BreakPoints>
    <Watches Count="1">
      <Item1>
        <Expression Value="self"/>
--- a/projects/triangle/uMainForm.pas
+++ b/projects/triangle/uMainForm.pas
@@ -6,12 +6,7 @@ interface
 uses
  Classes, SysUtils, FileUtil, Forms, Controls, Graphics, Dialogs, ExtCtrls,
  Vulkan, uvkuAllocationHandler,
  uvkuInstance, uvkuInstanceFactory,
  uvkuPhysicalDevice, uvkuPhysicalDeviceFactory,
  uvkuSurface, uvkuSurfaceFactory,
  uvkuDevice, uvkuDeviceFactory,
  uvkuSwapChain, uvkuSwapChainFactory;
  Vulkan, VulkanUtils;
 type
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
@@ -32,6 +27,7 @@ type
    fInstance: TvkuInstance;
    fPhyDevice: TvkuPhysicalDevice;
    fDevice: TvkuDevice;
    fQueue: TvkuQueue;
    fSurface: TvkuSurface;
    fSwapChain: TvkuSwapChain;
  public
@@ -78,7 +74,6 @@ procedure TMainForm.FormCreate(Sender: TObject);
 var
  PhyDevices: TvkuPhysicalDeviceArr;
  iFactory: TvkuInstanceFactory;
  pdFactory: TvkuPhysicalDeviceFactory;
  dFactory: TvkuDeviceFactory;
  sFactory: TvkuSurfaceFactory;
  scFactory: TvkuSwapChainFactory;
@@ -107,13 +102,7 @@ begin
  PhyDevices := fInstance.GetPhysicalDevices;
  if (Length(PhyDevices) <= 0) then
    raise Exception.Create('unable to get physical device');
  pdFactory := TvkuPhysicalDeviceFactory.Create(fInstance);
  try
    fPhyDevice := pdFactory.CreatePhysicalDevice(PhyDevices[0]);
  finally
    FreeAndNil(pdFactory);
  end;
  fPhyDevice := TvkuPhysicalDevice.Create(PhyDevices[0], fInstance.InstanceCommands);
  WriteLn('create vulkan surface');
  sFactory := TvkuSurfaceFactory.Create(fInstance);
@@ -141,6 +130,11 @@ begin
    FreeAndNil(dFactory);
  end;
  WriteLn('get queue from device');
  fQueue := TvkuQueue.Create(fDevice.GetQueue(0, 0), fDevice.DeviceCommands);
  WriteLn('create swap chain');
  scFactory := TvkuSwapChainFactory.Create(fDevice);
  try
@@ -210,6 +204,7 @@ end;
 procedure TMainForm.FormDestroy(Sender: TObject);
 begin
  FreeAndNil(fSwapChain);
  FreeAndNil(fQueue);
  FreeAndNil(fDevice);
  FreeAndNil(fSurface);
  FreeAndNil(fPhyDevice);
--- a/projects/utils/VulkanUtils.pas
+++ b/projects/utils/VulkanUtils.pas
@@ -0,0 +1,87 @@
 unit VulkanUtils;
 {$mode objfpc}{$H+}
 interface
 uses
  Classes, SysUtils,
  uvkuTypes, uvkuAllocationHandler,
  uvkuInstance, uvkuInstanceFactory,
  uvkuPhysicalDevice, uvkuDevice, uvkuDeviceFactory, uvkuDeviceMemory, uvkuQueue,
  uvkuSurface, uvkuSurfaceFactory,
  uvkuSwapChain, uvkuSwapChainFactory,
  uvkuImage, uvkuImageFactory, uvkuImageView, uvkuImageViewFactory,
  uvkuBuffer, uvkuBufferFactory, uvkuBufferView, uvkuBufferViewFactory,
  uvkuCommandPool, uvkuCommandPoolFactory, uvkuCommandBuffer;
 type
  { Types }
  TvkuFloatArr                          = uvkuTypes.TvkuFloatArr;
  TvkuUint32Arr                         = uvkuTypes.TvkuUint32Arr;
  TvkuImageArr                          = uvkuTypes.TvkuImageArr;
  TvkuPhysicalDeviceArr                 = uvkuTypes.TvkuPhysicalDeviceArr;
  TvkuQueueFamilyPropertiesArr          = uvkuTypes.TvkuQueueFamilyPropertiesArr;
  TvkuSparseImageFormatPropertiesArr    = uvkuTypes.TvkuSparseImageFormatPropertiesArr;
  TvkuSurfaceFormatArr                  = uvkuTypes.TvkuSurfaceFormatArr;
  TvkuPresentModeArr                    = uvkuTypes.TvkuPresentModeArr;
  TvkuDisplayPropertiesArr              = uvkuTypes.TvkuDisplayPropertiesArr;
  TvkuDisplayPlanePropertiesArr         = uvkuTypes.TvkuDisplayPlanePropertiesArr;
  TvkuDisplayArr                        = uvkuTypes.TvkuDisplayArr;
  TvkuDisplayModePropertiesArr          = uvkuTypes.TvkuDisplayModePropertiesArr;
  TvkuCommandBufferArr                  = uvkuTypes.TvkuCommandBufferArr;
  TvkuApplicationInfo                   = uvkuTypes.TvkuApplicationInfo;
  TvkuQueueCreateInfo                   = uvkuTypes.TvkuQueueCreateInfo;
  TvkuQueueCreateInfoArr                = uvkuTypes.TvkuQueueCreateInfoArr;
  TvkuAllocationHandler                 = uvkuAllocationHandler.TvkuAllocationHandler;
  { Instance }
  TvkuInstance                          = uvkuInstance.TvkuInstance;
  TvkuInstanceEx                        = uvkuInstanceFactory.TvkuInstanceEx;
  TvkuInstanceFactory                   = uvkuInstanceFactory.TvkuInstanceFactory;
  { Device }
  TvkuPhysicalDevice                    = uvkuPhysicalDevice.TvkuPhysicalDevice;
  TvkuDevice                            = uvkuDevice.TvkuDevice;
  TvkuDeviceEx                          = uvkuDeviceFactory.TvkuDeviceEx;
  TvkuDeviceFactory                     = uvkuDeviceFactory.TvkuDeviceFactory;
  TvkuDeviceMemory                      = uvkuDeviceMemory.TvkuDeviceMemory;
  TvkuQueue                             = uvkuQueue.TvkuQueue;
  { Surface }
  TvkuSurface                           = uvkuSurface.TvkuSurface;
  TvkuSurfaceEx                         = uvkuSurfaceFactory.TvkuSurfaceEx;
  TvkuSurfaceFactory                    = uvkuSurfaceFactory.TvkuSurfaceFactory;
  { SwapChain }
  TvkuSwapChain                         = uvkuSwapChain.TvkuSwapChain;
  TvkuSwapChainEx                       = uvkuSwapChainFactory.TvkuSwapChainEx;
  TvkuSwapChainFactory                  = uvkuSwapChainFactory.TvkuSwapChainFactory;
  { Image }
  TvkuImage                             = uvkuImage.TvkuImage;
  TvkuImageEx                           = uvkuImageFactory.TvkuImageEx;
  TvkuImageFactory                      = uvkuImageFactory.TvkuImageFactory;
  TvkuImageView                         = uvkuImageView.TvkuImageView;
  TvkuImageViewEx                       = uvkuImageViewFactory.TvkuImageViewEx;
  TvkuImageViewFactory                  = uvkuImageViewFactory.TvkuImageViewFactory;
  { Buffer }
  TvkuBuffer                            = uvkuBuffer.TvkuBuffer;
  TvkuBufferEx                          = uvkuBufferFactory.TvkuBufferEx;
  TvkuBufferFactory                     = uvkuBufferFactory.TvkuBufferFactory;
  TvkuBufferView                        = uvkuBufferView.TvkuBufferView;
  TvkuBufferViewEx                      = uvkuBufferViewFactory.TvkuBufferViewEx;
  TvkuBufferViewFactory                 = uvkuBufferViewFactory.TvkuBufferViewFactory;
  { Commands }
  TvkuCommandPool                       = uvkuCommandPool.TvkuCommandPool;
  TvkuCommandPoolEx                     = uvkuCommandPoolFactory.TvkuCommandPoolEx;
  TvkuCommandPoolFactory                = uvkuCommandPoolFactory.TvkuCommandPoolFactory;
  TvkuCommandBuffer                     = uvkuCommandBuffer.TvkuCommandBuffer;
 implementation
 end.
--- a/projects/utils/uvkuAllocationHandler.pas
+++ b/projects/utils/uvkuAllocationHandler.pas
@@ -11,6 +11,8 @@ uses
 type
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  TvkuAllocationHandler = class(TObject)
  private
    fAllocCallbacks: PVkAllocationCallbacks;
  protected
    function  AllocateMemory(const aSize: VkSize; const aAlignment: VkSize; const aScope: TVkSystemAllocationScope): PVkVoid; virtual;
    function  ReallocateMemory(const aOriginal: PVkVoid; const aSize: VkSize; const aAlignment: VkSize; const aScope: TVkSystemAllocationScope): PVkVoid; virtual;
@@ -20,6 +22,10 @@ type
    procedure InternalFreeNotification(const aSize: VkSize; const aType: TVkInternalAllocationType; const aScope: TVkSystemAllocationScope);
  public
    function GetAllocationCallbacks: TVkAllocationCallbacks;
    function GetAllocationCallbacksPtr: PVkAllocationCallbacks;
    constructor Create;
    destructor Destroy; override;
  end;
 implementation
@@ -90,13 +96,40 @@ end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 function TvkuAllocationHandler.GetAllocationCallbacks: TVkAllocationCallbacks;
 begin
  FillByte(result{%H-}, SizeOf(result), 0);
  result.pUserData              := self;
  result.pfnAllocation          := @AllocateMemoryCallback;
  result.pfnReallocation        := @ReallocateMemoryCallback;
  result.pfnFree                := @FreeMemoryCallback;
  result.pfnInternalAllocation  := @InternalAllocationCallback;
  result.pfnInternalFree        := @InternalFreeCallback;
  result := GetAllocationCallbacksPtr^;
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 function TvkuAllocationHandler.GetAllocationCallbacksPtr: PVkAllocationCallbacks;
 begin
  if not Assigned(fAllocCallbacks) then begin
    new(fAllocCallbacks);
    FillByte(fAllocCallbacks^, SizeOf(result), 0);
    fAllocCallbacks^.pUserData              := self;
    fAllocCallbacks^.pfnAllocation          := @AllocateMemoryCallback;
    fAllocCallbacks^.pfnReallocation        := @ReallocateMemoryCallback;
    fAllocCallbacks^.pfnFree                := @FreeMemoryCallback;
    fAllocCallbacks^.pfnInternalAllocation  := @InternalAllocationCallback;
    fAllocCallbacks^.pfnInternalFree        := @InternalFreeCallback;
  end;
  result := fAllocCallbacks;
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 constructor TvkuAllocationHandler.Create;
 begin
  inherited Create;
  fAllocCallbacks := nil;
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 destructor TvkuAllocationHandler.Destroy;
 begin
  if Assigned(fAllocCallbacks) then begin
    Dispose(fAllocCallbacks);
    fAllocCallbacks := nil;
  end;
  inherited Destroy;
 end;
 end.
--- a/projects/utils/uvkuBase.pas
+++ b/projects/utils/uvkuBase.pas
@@ -0,0 +1,92 @@
 unit uvkuBase;
 {$mode objfpc}{$H+}
 interface
 uses
  Classes, SysUtils,
  Vulkan;
 type
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  TvkuObject = class(TObject)
  end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  TvkuHandle = class(TvkuObject)
  private
    fOwnsHandle: Boolean;
  public
    property OwnsHandle: Boolean read fOwnsHandle write fOwnsHandle;
    constructor Create;
  end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  TvkuAllocHandle = class(TvkuHandle)
  private
    fAllocCallbacks: PVkAllocationCallbacks;
  protected
    property AllocCallbacks: PVkAllocationCallbacks read fAllocCallbacks;
    procedure SetAllocCallbacks(const aAllocCallbacks: TVkAllocationCallbacks);
    procedure SetAllocCallbacks(const aAllocCallbacks: PVkAllocationCallbacks);
    procedure DisposeAllocCallbacks;
  public
    constructor Create;
    destructor Destroy; override;
  end;
 implementation
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 //TvkuHandle/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 constructor TvkuHandle.Create;
 begin
  inherited Create;
  fOwnsHandle := true;
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 //TvkuAllocHandle////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 procedure TvkuAllocHandle.SetAllocCallbacks(const aAllocCallbacks: TVkAllocationCallbacks);
 begin
  if not Assigned(fAllocCallbacks) then
    new(fAllocCallbacks);
  fAllocCallbacks^ := aAllocCallbacks;
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 procedure TvkuAllocHandle.SetAllocCallbacks(const aAllocCallbacks: PVkAllocationCallbacks);
 begin
  if Assigned(aAllocCallbacks) then
    SetAllocCallbacks(aAllocCallbacks^);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 procedure TvkuAllocHandle.DisposeAllocCallbacks;
 begin
  if not Assigned(fAllocCallbacks) then
    exit;
  Dispose(fAllocCallbacks);
  fAllocCallbacks := nil;
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 constructor TvkuAllocHandle.Create;
 begin
  inherited Create;
  fAllocCallbacks := nil;
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 destructor TvkuAllocHandle.Destroy;
 begin
  inherited Destroy;
  DisposeAllocCallbacks;
 end;
 end.
--- a/projects/utils/uvkuBuffer.pas
+++ b/projects/utils/uvkuBuffer.pas
@@ -0,0 +1,82 @@
 unit uvkuBuffer;
 {$mode objfpc}{$H+}
 interface
 uses
  Classes, SysUtils,
  Vulkan, uvkuBase;
 type
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  TvkuBuffer = class(TvkuAllocHandle)
  private
    fHandle: VkBuffer;
    fDeviceCommands: TVkDeviceCommands;
    procedure CreateHandle(const aCreateInfo: TVkBufferCreateInfo);
  public
    property Handle:         VkBuffer          read fHandle;
    property DeviceCommands: TVkDeviceCommands read fDeviceCommands;
    constructor Create(
      const aCreateInfo: TVkBufferCreateInfo;
      const aDeviceCommands: TVkDeviceCommands;
      const aAllocCallbacks: PVkAllocationCallbacks = nil);
    constructor Create(
      const aHandle: VkBuffer;
      const aOwnsHandle: Boolean;
      const aDeviceCommands: TVkDeviceCommands;
      const aAllocCallbacks: PVkAllocationCallbacks = nil);
    destructor Destroy; override;
  end;
 implementation
 uses
  uvkuUtils;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 //TvkuBuffer/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 procedure TvkuBuffer.CreateHandle(const aCreateInfo: TVkBufferCreateInfo);
 var err: TVkResult;
 begin
  err := fDeviceCommands.vkCreateBuffer(fDeviceCommands.Device, @aCreateInfo, AllocCallbacks, @fHandle);
  if (err < VK_SUCCESS) then
    raise TvkuErrorException.Create('unable to create buffer', err);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 constructor TvkuBuffer.Create(const aCreateInfo: TVkBufferCreateInfo; const aDeviceCommands: TVkDeviceCommands;
  const aAllocCallbacks: PVkAllocationCallbacks);
 begin
  inherited Create;
  fDeviceCommands := aDeviceCommands;
  SetAllocCallbacks(aAllocCallbacks);
  CreateHandle(aCreateInfo);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 constructor TvkuBuffer.Create(const aHandle: VkBuffer; const aOwnsHandle: Boolean;
  const aDeviceCommands: TVkDeviceCommands; const aAllocCallbacks: PVkAllocationCallbacks);
 begin
  inherited Create;
  fHandle         := aHandle;
  fDeviceCommands := aDeviceCommands;
  OwnsHandle      := aOwnsHandle;
  SetAllocCallbacks(aAllocCallbacks);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 destructor TvkuBuffer.Destroy;
 begin
  if OwnsHandle and (fHandle <> VK_INVALID_NDP_HANDLE) then
    fDeviceCommands.vkDestroyBuffer(fDeviceCommands.Device, fHandle, AllocCallbacks);
  fHandle := VK_INVALID_NDP_HANDLE;
  inherited Destroy;
 end;
 end.
--- a/projects/utils/uvkuBufferFactory.pas
+++ b/projects/utils/uvkuBufferFactory.pas
@@ -0,0 +1,140 @@
 unit uvkuBufferFactory;
 {$mode objfpc}{$H+}
 interface
 uses
  Classes, SysUtils,
  Vulkan, uvkuBuffer, uvkuDevice, uvkuAllocationHandler, uvkuTypes;
 type
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  TvkuBufferEx = class(TvkuBuffer)
  private
    fAllocHandler: TvkuAllocationHandler;
    fOwnsHandle: Boolean;
  public
    destructor Destroy; override;
  end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  TvkuBufferFactory = class(TObject)
  private
    fDeviceCommands: TVkDeviceCommands;
    fFlags: VkBufferCreateFlags;
    fSize: VkDeviceSize;
    fUsage: VkBufferUsageFlags;
    fSharingMode: TVkSharingMode;
    fQueueFamilyIndices: TvkuUint32Arr;
    function GetQueueFamilyIndex(const aIndex: Integer): VkUint32;
    function GetQueueFamilyIndexCount: Integer;
    procedure SetQueueFamilyIndex(const aIndex: Integer; aValue: VkUint32);
  public
    property DeviceCommands:  TVkDeviceCommands       read fDeviceCommands;
    property Flags:           VkBufferCreateFlags     read fFlags         write fFlags;
    property Size:            VkDeviceSize            read fSize          write fSize;
    property Usage:           VkBufferUsageFlags      read fUsage         write fUsage;
    property SharingMode:     TVkSharingMode          read fSharingMode   write fSharingMode;
    property QueueFamilyIndices: TvkuUint32Arr read fQueueFamilyIndices;
    property QueueFamilyIndexCount: Integer read GetQueueFamilyIndexCount;
    property QueueFamilyIndex[const aIndex: Integer]: VkUint32 read GetQueueFamilyIndex write SetQueueFamilyIndex;
    function CreateBuffer: TvkuBufferEx;
    function CreateBuffer(
      const aAllocHandler: TvkuAllocationHandler;
      const aOwnsHandler: Boolean): TvkuBufferEx;
    constructor Create(const aDevice: TvkuDevice);
    constructor Create(const aDeviceCommands: TVkDeviceCommands);
  end;
 implementation
 uses
  uvkuUtils;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 //TvkuBufferEx///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 destructor TvkuBufferEx.Destroy;
 begin
  if fOwnsHandle then
    FreeAndNil(fAllocHandler);
  inherited Destroy;
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 //TvkuBufferFactory//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 function TvkuBufferFactory.GetQueueFamilyIndex(const aIndex: Integer): VkUint32;
 begin
  if (aIndex < low(fQueueFamilyIndices)) or (aIndex > high(fQueueFamilyIndices)) then
    raise TvkuException.CreateFmt('index (%d) out of range (%d : %d)', [aIndex, Low(fQueueFamilyIndices), High(fQueueFamilyIndices)]);
  result := fQueueFamilyIndices[aIndex];
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 function TvkuBufferFactory.GetQueueFamilyIndexCount: Integer;
 begin
  result := Length(fQueueFamilyIndices);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 procedure TvkuBufferFactory.SetQueueFamilyIndex(const aIndex: Integer; aValue: VkUint32);
 begin
  if (aIndex < low(fQueueFamilyIndices)) or (aIndex > high(fQueueFamilyIndices)) then
    raise TvkuException.CreateFmt('index (%d) out of range (%d : %d)', [aIndex, Low(fQueueFamilyIndices), High(fQueueFamilyIndices)]);
  fQueueFamilyIndices[aIndex] := aValue;
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 function TvkuBufferFactory.CreateBuffer: TvkuBufferEx;
 begin
  result := CreateBuffer(nil, false);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 function TvkuBufferFactory.CreateBuffer(const aAllocHandler: TvkuAllocationHandler; const aOwnsHandler: Boolean): TvkuBufferEx;
 var
  CreateInfo: TVkBufferCreateInfo;
 begin
  FillByte(CreateInfo, 0, SizeOf(CreateInfo));
  CreateInfo.sType                 := VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO;
  CreateInfo.pNext                 := nil;
  CreateInfo.flags                 := fFlags;
  CreateInfo.size                  := fSize;
  CreateInfo.usage                 := fUsage;
  CreateInfo.sharingMode           := fSharingMode;
  CreateInfo.queueFamilyIndexCount := Length(fQueueFamilyIndices);
  CreateInfo.pQueueFamilyIndices   := @fQueueFamilyIndices[0];
  if Assigned(aAllocHandler)
    then result := TvkuBufferEx.Create(CreateInfo, fDeviceCommands, aAllocHandler.GetAllocationCallbacksPtr)
    else result := TvkuBufferEx.Create(CreateInfo, fDeviceCommands);
  try
    TvkuBufferEx(result).fAllocHandler := aAllocHandler;
    TvkuBufferEx(result).fOwnsHandle   := aOwnsHandler;
  except
    FreeAndNil(result);
    raise;
  end;
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 constructor TvkuBufferFactory.Create(const aDevice: TvkuDevice);
 begin
  Create(aDevice.DeviceCommands);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 constructor TvkuBufferFactory.Create(const aDeviceCommands: TVkDeviceCommands);
 begin
  inherited Create;
  fDeviceCommands := aDeviceCommands;
 end;
 end.
--- a/projects/utils/uvkuBufferView.pas
+++ b/projects/utils/uvkuBufferView.pas
@@ -0,0 +1,82 @@
 unit uvkuBufferView;
 {$mode objfpc}{$H+}
 interface
 uses
  Classes, SysUtils,
  Vulkan, uvkuBase;
 type
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  TvkuBufferView = class(TvkuAllocHandle)
  private
    fHandle: VkBufferView;
    fDeviceCommands: TVkDeviceCommands;
    procedure CreateHandle(const aCreateInfo: TVkBufferViewCreateInfo);
  public
    property Handle:         VkBufferView      read fHandle;
    property DeviceCommands: TVkDeviceCommands read fDeviceCommands;
    constructor Create(
      const aCreateInfo: TVkBufferViewCreateInfo;
      const aDeviceCommands: TVkDeviceCommands;
      const aAllocCallbacks: PVkAllocationCallbacks = nil);
    constructor Create(
      const aHandle: VkBufferView;
      const aOwnsHandle: Boolean;
      const aDeviceCommands: TVkDeviceCommands;
      const aAllocCallbacks: PVkAllocationCallbacks = nil);
    destructor Destroy; override;
  end;
 implementation
 uses
  uvkuUtils;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 //TvkuBufferView/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 procedure TvkuBufferView.CreateHandle(const aCreateInfo: TVkBufferViewCreateInfo);
 var err: TVkResult;
 begin
  err := fDeviceCommands.vkCreateBufferView(fDeviceCommands.Device, @aCreateInfo, AllocCallbacks, @fHandle);
  if (err < VK_SUCCESS) then
    raise TvkuErrorException.Create('unable to create buffer view', err);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 constructor TvkuBufferView.Create(const aCreateInfo: TVkBufferViewCreateInfo; const aDeviceCommands: TVkDeviceCommands;
  const aAllocCallbacks: PVkAllocationCallbacks);
 begin
  inherited Create;
  fDeviceCommands := aDeviceCommands;
  SetAllocCallbacks(aAllocCallbacks);
  CreateHandle(aCreateInfo);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 constructor TvkuBufferView.Create(const aHandle: VkBufferView; const aOwnsHandle: Boolean;
  const aDeviceCommands: TVkDeviceCommands; const aAllocCallbacks: PVkAllocationCallbacks);
 begin
  inherited Create;
  fHandle         := aHandle;
  fDeviceCommands := aDeviceCommands;
  OwnsHandle      := aOwnsHandle;
  SetAllocCallbacks(aAllocCallbacks);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 destructor TvkuBufferView.Destroy;
 begin
  if OwnsHandle and (fHandle <> VK_INVALID_NDP_HANDLE) then
    fDeviceCommands.vkDestroyBufferView(fDeviceCommands.Device, fHandle, AllocCallbacks);
  fHandle := VK_INVALID_NDP_HANDLE;
  inherited Destroy;
 end;
 end.
--- a/projects/utils/uvkuBufferViewFactory.pas
+++ b/projects/utils/uvkuBufferViewFactory.pas
@@ -0,0 +1,107 @@
 unit uvkuBufferViewFactory;
 {$mode objfpc}{$H+}
 interface
 uses
  Classes, SysUtils,
  Vulkan, uvkuBufferView, uvkuAllocationHandler, uvkuDevice;
 type
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  TvkuBufferViewEx = class(TvkuBufferView)
  private
    fAllocHandler: TvkuAllocationHandler;
    fOwnsHandler: Boolean;
  public
    destructor Destroy; override;
  end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  TvkuBufferViewFactory = class(TObject)
  private
    fDeviceCommands: TVkDeviceCommands;
    fFlags:  VkBufferViewCreateFlags;
    fBuffer: VkBuffer;
    fFormat: TVkFormat;
    fOffset: VkDeviceSize;
    fRange:  VkDeviceSize;
  public
    property DeviceCommands:    TVkDeviceCommands         read fDeviceCommands;
    property Flags:  VkBufferViewCreateFlags read fFlags  write fFlags;
    property Buffer: VkBuffer                read fBuffer write fBuffer;
    property Format: TVkFormat               read fFormat write fFormat;
    property Offset: VkDeviceSize            read fOffset write fOffset;
    property Range:  VkDeviceSize            read fRange  write fRange;
    function CreateBufferView: TvkuBufferViewEx;
    function CreateBufferView(
      const aAllocHandler: TvkuAllocationHandler;
      const aOwnsHandler: Boolean): TvkuBufferViewEx;
    constructor Create(const aDevice: TvkuDevice);
    constructor Create(const aDeviceCommands: TVkDeviceCommands);
  end;
 implementation
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 //TvkuBufferViewEx///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 destructor TvkuBufferViewEx.Destroy;
 begin
  inherited Destroy;
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 //TvkuBufferViewFactory//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 function TvkuBufferViewFactory.CreateBufferView: TvkuBufferViewEx;
 begin
  result := CreateBufferView(nil, false);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 function TvkuBufferViewFactory.CreateBufferView(const aAllocHandler: TvkuAllocationHandler; const aOwnsHandler: Boolean): TvkuBufferViewEx;
 var
  CreateInfo: TVkBufferViewCreateInfo;
 begin
  FillByte(CreateInfo, SizeOf(CreateInfo), 0);
  CreateInfo.sType  := VK_STRUCTURE_TYPE_BUFFER_VIEW_CREATE_INFO;
  CreateInfo.pNext  := nil;
  CreateInfo.flags  := fFlags;
  CreateInfo.buffer := fBuffer;
  CreateInfo.format := fFormat;
  CreateInfo.offset := fOffset;
  CreateInfo.range  := fRange;
  if Assigned(aAllocHandler)
    then result := TvkuBufferViewEx.Create(CreateInfo, fDeviceCommands, aAllocHandler.GetAllocationCallbacksPtr)
    else result := TvkuBufferViewEx.Create(CreateInfo, fDeviceCommands);
  try
    TvkuBufferViewEx(result).fAllocHandler := aAllocHandler;
    TvkuBufferViewEx(result).fOwnsHandler  := aOwnsHandler;
  except
    FreeAndNil(result);
    raise;
  end;
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 constructor TvkuBufferViewFactory.Create(const aDevice: TvkuDevice);
 begin
  Create(aDevice.DeviceCommands);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 constructor TvkuBufferViewFactory.Create(const aDeviceCommands: TVkDeviceCommands);
 begin
  inherited Create;
  fDeviceCommands := aDeviceCommands;
 end;
 end.
--- a/projects/utils/uvkuCommandBuffer.pas
+++ b/projects/utils/uvkuCommandBuffer.pas
@@ -0,0 +1,56 @@
 unit uvkuCommandBuffer;
 {$mode objfpc}{$H+}
 interface
 uses
  Classes, SysUtils,
  Vulkan, uvkuBase;
 type
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  TvkuCommandBuffer = class(TvkuHandle)
  private
    fHandle: VkCommandBuffer;
    fCommandPool: VkCommandPool;
    fDeviceCommands: TVkDeviceCommands;
  public
    property Handle:          VkCommandBuffer   read fHandle;
    property CommandPool:     VkCommandPool     read fCommandPool;
    property DeviceCommands:  TVkDeviceCommands read fDeviceCommands;
    constructor Create(
      const aHandle: VkCommandBuffer;
      const aOwnsHandle: Boolean;
      const aCommandPool: VkCommandPool;
      const aDeviceCommands: TVkDeviceCommands);
    destructor Destroy; override;
  end;
 implementation
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 //TvkuCommandBuffer//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 constructor TvkuCommandBuffer.Create(const aHandle: VkCommandBuffer; const aOwnsHandle: Boolean;
  const aCommandPool: VkCommandPool; const aDeviceCommands: TVkDeviceCommands);
 begin
  inherited Create;
  fHandle         := aHandle;
  fCommandPool    := aCommandPool;
  fDeviceCommands := aDeviceCommands;
  OwnsHandle      := aOwnsHandle;
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 destructor TvkuCommandBuffer.Destroy;
 begin
  if OwnsHandle and (fHandle <> VK_INVALID_HANDLE) then
    fDeviceCommands.vkFreeCommandBuffers(fDeviceCommands.Device, fCommandPool, 1, @fHandle);
  fHandle := VK_INVALID_HANDLE;
  inherited Destroy;
 end;
 end.
--- a/projects/utils/uvkuCommandPool.pas
+++ b/projects/utils/uvkuCommandPool.pas
@@ -0,0 +1,128 @@
 unit uvkuCommandPool;
 {$mode objfpc}{$H+}
 interface
 uses
  Classes, SysUtils,
  Vulkan, uvkuBase, uvkuTypes;
 type
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  TvkuCommandPool = class(TvkuAllocHandle)
  private
    fHandle: VkCommandPool;
    fDeviceCommands: TVkDeviceCommands;
    procedure CreateHandle(const aCreateInfo: TVkCommandPoolCreateInfo);
  public
    property Handle:          VkCommandPool     read fHandle;
    property DeviceCommands:  TVkDeviceCommands read fDeviceCommands;
    function CreateCommandBuffer(
      const aLevel: TVkCommandBufferLevel): VkCommandBuffer;
    function CreateCommandBuffers(
      const aLevel: TVkCommandBufferLevel;
      const aCount: Integer): TvkuCommandBufferArr;
    procedure FreeCommandBuffer(
      const aBuffer: VkCommandBuffer);
    procedure FreeCommandBuffers(
      const aBuffers: TvkuCommandBufferArr);
    constructor Create(
      const aCreateInfo: TVkCommandPoolCreateInfo;
      const aDeviceCommands: TVkDeviceCommands;
      const aAllocCallbacks: PVkAllocationCallbacks = nil);
    constructor Create(
      const aHandle: VkCommandPool;
      const aOwnsHandle: Boolean;
      const aDeviceCommands: TVkDeviceCommands;
      const aAllocCallbacks: PVkAllocationCallbacks = nil);
    destructor Destroy; override;
  end;
 implementation
 uses
  uvkuUtils;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 //TvkuCommandPool////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 procedure TvkuCommandPool.CreateHandle(const aCreateInfo: TVkCommandPoolCreateInfo);
 var err: TVkResult;
 begin
  err := fDeviceCommands.vkCreateCommandPool(fDeviceCommands.Device, @aCreateInfo, AllocCallbacks, @fHandle);
  if (err < VK_SUCCESS) then
    raise TvkuErrorException.Create('unable to create command pool', err);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 function TvkuCommandPool.CreateCommandBuffer(const aLevel: TVkCommandBufferLevel): VkCommandBuffer;
 begin
  result := CreateCommandBuffers(aLevel, 1)[0];
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 function TvkuCommandPool.CreateCommandBuffers(const aLevel: TVkCommandBufferLevel; const aCount: Integer): TvkuCommandBufferArr;
 var
  AllocInfo: TVkCommandBufferAllocateInfo;
  err: TVkResult;
 begin
  FillByte(AllocInfo, SizeOf(AllocInfo), 0);
  AllocInfo.sType               := VK_STRUCTURE_TYPE_COMMAND_BUFFER_ALLOCATE_INFO;
  AllocInfo.pNext               := nil;
  AllocInfo.commandPool         := fHandle;
  AllocInfo.level               := aLevel;
  AllocInfo.commandBufferCount  := aCount;
  SetLength(result, aCount);
  err := fDeviceCommands.vkAllocateCommandBuffers(fDeviceCommands.Device, @AllocInfo, @result[0]);
  if (err < VK_SUCCESS) then
    raise TvkuErrorException.Create('unable to create command buffers', err);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 procedure TvkuCommandPool.FreeCommandBuffer(const aBuffer: VkCommandBuffer);
 begin
  FreeCommandBuffers(TvkuCommandBufferArr.Create(aBuffer));
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 procedure TvkuCommandPool.FreeCommandBuffers(const aBuffers: TvkuCommandBufferArr);
 begin
  fDeviceCommands.vkFreeCommandBuffers(fDeviceCommands.Device, fHandle, Length(aBuffers), @aBuffers[0]);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 constructor TvkuCommandPool.Create(const aCreateInfo: TVkCommandPoolCreateInfo;
  const aDeviceCommands: TVkDeviceCommands; const aAllocCallbacks: PVkAllocationCallbacks);
 begin
  inherited Create;
  fDeviceCommands := aDeviceCommands;
  SetAllocCallbacks(aAllocCallbacks);
  CreateHandle(aCreateInfo);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 constructor TvkuCommandPool.Create(const aHandle: VkCommandPool; const aOwnsHandle: Boolean;
  const aDeviceCommands: TVkDeviceCommands; const aAllocCallbacks: PVkAllocationCallbacks);
 begin
  inherited Create;
  fHandle         := aHandle;
  fDeviceCommands := aDeviceCommands;
  OwnsHandle      := aOwnsHandle;
  SetAllocCallbacks(aAllocCallbacks);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 destructor TvkuCommandPool.Destroy;
 begin
  if OwnsHandle and (fHandle <> VK_INVALID_NDP_HANDLE) then
    fDeviceCommands.vkDestroyCommandPool(fDeviceCommands.Device, fHandle, AllocCallbacks);
  fHandle := VK_INVALID_NDP_HANDLE;
  inherited Destroy;
 end;
 end.
--- a/projects/utils/uvkuCommandPoolFactory.pas
+++ b/projects/utils/uvkuCommandPoolFactory.pas
@@ -0,0 +1,92 @@
 unit uvkuCommandPoolFactory;
 {$mode objfpc}{$H+}
 interface
 uses
  Classes, SysUtils,
  Vulkan, uvkuCommandPool, uvkuDevice, uvkuAllocationHandler;
 type
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  TvkuCommandPoolEx = class(TvkuCommandPool)
  private
    fAllocHandler: TvkuAllocationHandler;
    fOwnsHandler: Boolean;
  public
    destructor Destroy; override;
  end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  TvkuCommandPoolFactory = class(TObject)
  private
    fDeviceCommands: TVkDeviceCommands;
    fFlags: VkCommandPoolCreateFlags;
    fQueueFamilyIndex: VkUint32;
  public
    function CreateCommandPool: TvkuCommandPoolEx;
    function CreateCommandPool(
      const aAllocHandler: TvkuAllocationHandler;
      const aOwnsHandler: Boolean): TvkuCommandPoolEx;
    constructor Create(const aDevice: TvkuDevice);
    constructor Create(const aDeviceCommands: TVkDeviceCommands);
  end;
 implementation
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 //TvkuCommandPoolEx//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 destructor TvkuCommandPoolEx.Destroy;
 begin
  if fOwnsHandler then
    FreeAndNil(fAllocHandler);
  inherited Destroy;
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 //TvkuCommandPoolFactory/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 function TvkuCommandPoolFactory.CreateCommandPool: TvkuCommandPoolEx;
 begin
  result := CreateCommandPool(nil, false);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 function TvkuCommandPoolFactory.CreateCommandPool(const aAllocHandler: TvkuAllocationHandler; const aOwnsHandler: Boolean): TvkuCommandPoolEx;
 var CreateInfo: TVkCommandPoolCreateInfo;
 begin
  FillByte(CreateInfo, SizeOf(CreateInfo), 0);
  CreateInfo.sType            := VK_STRUCTURE_TYPE_COMMAND_POOL_CREATE_INFO;
  CreateInfo.pNext            := nil;
  CreateInfo.flags            := fFlags;
  CreateInfo.queueFamilyIndex := fQueueFamilyIndex;
  if Assigned(aAllocHandler)
    then result := TvkuCommandPoolEx.Create(CreateInfo, fDeviceCommands, aAllocHandler.GetAllocationCallbacksPtr)
    else result := TvkuCommandPoolEx.Create(CreateInfo, fDeviceCommands);
  try
    TvkuCommandPoolEx(result).fAllocHandler := aAllocHandler;
    TvkuCommandPoolEx(result).fOwnsHandler  := aOwnsHandler;
  except
    FreeAndNil(result);
    raise;
  end;
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 constructor TvkuCommandPoolFactory.Create(const aDevice: TvkuDevice);
 begin
  Create(aDevice.DeviceCommands);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 constructor TvkuCommandPoolFactory.Create(const aDeviceCommands: TVkDeviceCommands);
 begin
  inherited Create;
  fDeviceCommands := aDeviceCommands;
 end;
 end.
--- a/projects/utils/uvkuDevice.pas
+++ b/projects/utils/uvkuDevice.pas
@@ -6,35 +6,35 @@ interface
 uses
  Classes, SysUtils,
  Vulkan;
  Vulkan, uvkuBase;
 type
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  TvkuDevice = class(TObject)
  TvkuDevice = class(TvkuAllocHandle)
  private
    fHandle: VkDevice;
    fPhysicalDevice: VkPhysicalDevice;
    fAllocCallbacks: PVkAllocationCallbacks;
    fInstanceCommands: TVkInstanceCommands;
    fDeviceCommands: TVkDeviceCommands;
    procedure CreateHandle(
      const aCreateInfo: PVkDeviceCreateInfo;
      const aAllocCallbacks: PVkAllocationCallbacks);
      const aPhyDevice: VkPhysicalDevice;
      const aCreateInfo: PVkDeviceCreateInfo);
  public
    property Handle:         VkDevice          read fHandle;
    property PhysicalDevice: VkPhysicalDevice  read fPhysicalDevice;
    property DeviceCommands: TVkDeviceCommands read fDeviceCommands;
    function GetQueue(const aQueueFamilyIndex, aQueueIndex: VkUint32): VkQueue;
    constructor Create(
      const aPhysicalDevice: VkPhysicalDevice;
      const aCreateInfo: TVkDeviceCreateInfo;
      const aInstanceCommands: TVkInstanceCommands);
      const aInstanceCommands: TVkInstanceCommands;
      const aAllocCallbacks: PVkAllocationCallbacks = nil);
    constructor Create(
      const aPhysicalDevice: VkPhysicalDevice;
      const aCreateInfo: TVkDeviceCreateInfo;
      const aHandle: VkDevice;
      const aOwnsHandle: Boolean;
      const aInstanceCommands: TVkInstanceCommands;
      const aAllocCallbacks: TVkAllocationCallbacks);
      const aAllocCallbacks: PVkAllocationCallbacks = nil);
    destructor Destroy; override;
  end;
@@ -46,16 +46,12 @@ uses
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 //TvkuDevice/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 procedure TvkuDevice.CreateHandle(const aCreateInfo: PVkDeviceCreateInfo; const aAllocCallbacks: PVkAllocationCallbacks);
 procedure TvkuDevice.CreateHandle(const aPhyDevice: VkPhysicalDevice; const aCreateInfo: PVkDeviceCreateInfo);
 var err: TVkResult;
 begin
  if not Assigned(fInstanceCommands.vkCreateDevice) then
    raise TvkuException.Create('invalid function pointer: vkCreateDevice; did you load the vulkan core commands?');
  if Assigned(aAllocCallbacks) then begin
    new(fAllocCallbacks);
    fAllocCallbacks^ := aAllocCallbacks^;
  end;
  err := fInstanceCommands.vkCreateDevice(fPhysicalDevice, aCreateInfo, fAllocCallbacks, @fHandle);
    raise TvkuInvalidFuncPtrException.Create('vkCreateDevice');
  err := fInstanceCommands.vkCreateDevice(aPhyDevice, aCreateInfo, AllocCallbacks, @fHandle);
  if (err < VK_SUCCESS) then
    raise TvkuErrorException.Create('unable to create device', err);
  fDeviceCommands := LoadDeviceCommands(fInstanceCommands.Instance, fHandle);
@@ -63,39 +59,44 @@ begin
    raise TvkuException.Create('unable to load device commands');
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 function TvkuDevice.GetQueue(const aQueueFamilyIndex, aQueueIndex: VkUint32): VkQueue;
 begin
  if not Assigned(fDeviceCommands.vkGetDeviceQueue) then
    raise TvkuInvalidFuncPtrException.Create('vkGetDeviceQueue');
  fDeviceCommands.vkGetDeviceQueue(fHandle, aQueueFamilyIndex, aQueueIndex, @result);
  if (result = VK_INVALID_HANDLE) then
    raise TvkuException.Create('unable to get device queue');
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 constructor TvkuDevice.Create(const aPhysicalDevice: VkPhysicalDevice; const aCreateInfo: TVkDeviceCreateInfo;
  const aInstanceCommands: TVkInstanceCommands);
  const aInstanceCommands: TVkInstanceCommands; const aAllocCallbacks: PVkAllocationCallbacks);
 begin
  inherited Create;
  fHandle           := nil;
  fPhysicalDevice   := aPhysicalDevice;
  fInstanceCommands := aInstanceCommands;
  CreateHandle(@aCreateInfo, nil);
  SetAllocCallbacks(aAllocCallbacks);
  CreateHandle(aPhysicalDevice, @aCreateInfo);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 constructor TvkuDevice.Create(const aPhysicalDevice: VkPhysicalDevice; const aCreateInfo: TVkDeviceCreateInfo;
  const aInstanceCommands: TVkInstanceCommands; const aAllocCallbacks: TVkAllocationCallbacks);
 constructor TvkuDevice.Create(const aHandle: VkDevice; const aOwnsHandle: Boolean;
  const aInstanceCommands: TVkInstanceCommands; const aAllocCallbacks: PVkAllocationCallbacks);
 begin
  inherited Create;
  fHandle           := nil;
  fPhysicalDevice   := aPhysicalDevice;
  fHandle           := aHandle;
  fInstanceCommands := aInstanceCommands;
  CreateHandle(@aCreateInfo, @aAllocCallbacks);
  OwnsHandle        := aOwnsHandle;
  SetAllocCallbacks(aAllocCallbacks);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 destructor TvkuDevice.Destroy;
 begin
  if (fHandle <> VK_INVALID_HANDLE) then begin
    fDeviceCommands.vkDestroyDevice(fHandle, fAllocCallbacks);
    fHandle := VK_INVALID_HANDLE;
  end;
  if Assigned(fAllocCallbacks) then begin
    Dispose(fAllocCallbacks);
    fAllocCallbacks := nil;
  end;
  if OwnsHandle and (fHandle <> VK_INVALID_HANDLE) then
    fDeviceCommands.vkDestroyDevice(fHandle, AllocCallbacks);
  fHandle := VK_INVALID_HANDLE;
  FreeAndNil(fDeviceCommands);
  inherited Destroy;
 end;
--- a/projects/utils/uvkuDeviceFactory.pas
+++ b/projects/utils/uvkuDeviceFactory.pas
@@ -6,18 +6,9 @@ interface
 uses
  Classes, SysUtils,
  Vulkan, uvkuInstance, uvkuDevice, uvkuAllocationHandler;
  Vulkan, uvkuInstance, uvkuDevice, uvkuAllocationHandler, uvkuTypes;
 type
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  TvkuQueuePriorityArr = array of VkFloat;
  TvkuQueueCreateInfo = packed record
    Flags:        VkDeviceQueueCreateFlags;
    FamilyIndex:  VkUint32;
    Priorities:   TvkuQueuePriorityArr;
  end;
  TvkuQueueCreateInfoArr = array of TvkuQueueCreateInfo;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  TvkuDeviceEx = class(TvkuDevice)
  private
@@ -58,11 +49,11 @@ type
    property QueueCreateInfo[const aIndex: Integer]: TvkuQueueCreateInfo read GetQueueCreateInfo write SetQueueCreateInfo;
    function CreateDevice(
      const aPhysicalDevice: VkPhysicalDevice): TvkuDevice;
      const aPhysicalDevice: VkPhysicalDevice): TvkuDeviceEx;
    function CreateDevice(
      const aPhysicalDevice: VkPhysicalDevice;
      const aAllocHandler: TvkuAllocationHandler;
      const aOwnsHandler: Boolean): TvkuDevice;
      const aOwnsHandler: Boolean): TvkuDeviceEx;
    constructor Create(const aInstance: TvkuInstance);
    constructor Create(const aInstanceCommands: TVkInstanceCommands);
@@ -141,14 +132,14 @@ begin
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 function TvkuDeviceFactory.CreateDevice(const aPhysicalDevice: VkPhysicalDevice): TvkuDevice;
 function TvkuDeviceFactory.CreateDevice(const aPhysicalDevice: VkPhysicalDevice): TvkuDeviceEx;
 begin
  result := CreateDevice(aPhysicalDevice, nil, false);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 function TvkuDeviceFactory.CreateDevice(const aPhysicalDevice: VkPhysicalDevice;
  const aAllocHandler: TvkuAllocationHandler; const aOwnsHandler: Boolean): TvkuDevice;
  const aAllocHandler: TvkuAllocationHandler; const aOwnsHandler: Boolean): TvkuDeviceEx;
 var
  CreateInfo: TVkDeviceCreateInfo;
  QueueInfos: array of TVkDeviceQueueCreateInfo;
@@ -193,7 +184,7 @@ begin
  CreateInfo.pEnabledFeatures        := @fFeatures;
  if Assigned(aAllocHandler)
    then result := TvkuDeviceEx.Create(aPhysicalDevice, CreateInfo, fInstanceCommands, aAllocHandler.GetAllocationCallbacks)
    then result := TvkuDeviceEx.Create(aPhysicalDevice, CreateInfo, fInstanceCommands, aAllocHandler.GetAllocationCallbacksPtr)
    else result := TvkuDeviceEx.Create(aPhysicalDevice, CreateInfo, fInstanceCommands);
  try
    TvkuDeviceEx(result).fAllocHandler := aAllocHandler;
--- a/projects/utils/uvkuDeviceMemory.pas
+++ b/projects/utils/uvkuDeviceMemory.pas
@@ -0,0 +1,100 @@
 unit uvkuDeviceMemory;
 {$mode objfpc}{$H+}
 interface
 uses
  Classes, SysUtils,
  Vulkan, uvkuBase;
 type
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  TvkuDeviceMemory = class(TvkuAllocHandle)
  private
    fHandle: VkDeviceMemory;
    fDeviceCommands: TVkDeviceCommands;
    procedure CreateHandle(const aAllocInfo: TVkMemoryAllocateInfo);
  public
    property Handle:        VkDeviceMemory     read fHandle;
    property DeviceCommands: TVkDeviceCommands read fDeviceCommands;
    function Map(const aOffset: VkDeviceSize; aSize: VkDeviceSize; aFlags: VkMemoryMapFlags): PVkVoid;
    procedure Unmap;
    constructor Create(const aAllocInfo: TVkMemoryAllocateInfo; const aDeviceCommands: TVkDeviceCommands;
      const aAllocCallbacks: PVkAllocationCallbacks);
    constructor Create(
      const aHandle: VkDeviceMemory;
      const aOwnsHandle: Boolean;
      const aDeviceCommands: TVkDeviceCommands;
      const aAllocCallbacks: PVkAllocationCallbacks = nil);
    destructor Destroy; override;
  end;
 implementation
 uses
  uvkuUtils;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 //TvkuDeviceMemory///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 procedure TvkuDeviceMemory.CreateHandle(const aAllocInfo: TVkMemoryAllocateInfo);
 var err: TVkResult;
 begin
  if not Assigned(fDeviceCommands.vkAllocateMemory) then
    raise TvkuInvalidFuncPtrException.Create('vkAllocateMemory');
  err := fDeviceCommands.vkAllocateMemory(fDeviceCommands.Device, @aAllocInfo, AllocCallbacks, @fHandle);
  if (err < VK_SUCCESS) then
    raise TvkuErrorException.Create('unable to allocate device memory', err);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 function TvkuDeviceMemory.Map(const aOffset: VkDeviceSize; aSize: VkDeviceSize; aFlags: VkMemoryMapFlags): PVkVoid;
 var err: TVkResult;
 begin
  err := fDeviceCommands.vkMapMemory(fDeviceCommands.Device, fHandle, aOffset, aSize, aFlags, @result);
  if (err < VK_SUCCESS) then
    raise TvkuErrorException.Create('unable to map device memory', err);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 procedure TvkuDeviceMemory.Unmap;
 begin
  fDeviceCommands.vkUnmapMemory(fDeviceCommands.Device, fHandle);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 constructor TvkuDeviceMemory.Create(const aAllocInfo: TVkMemoryAllocateInfo; const aDeviceCommands: TVkDeviceCommands;
  const aAllocCallbacks: PVkAllocationCallbacks);
 begin
  inherited Create;
  fDeviceCommands := aDeviceCommands;
  SetAllocCallbacks(aAllocCallbacks);
  CreateHandle(aAllocInfo);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 constructor TvkuDeviceMemory.Create(const aHandle: VkDeviceMemory; const aOwnsHandle: Boolean;
  const aDeviceCommands: TVkDeviceCommands; const aAllocCallbacks: PVkAllocationCallbacks);
 begin
  inherited Create;
  fHandle         := aHandle;
  fDeviceCommands := aDeviceCommands;
  OwnsHandle      := aOwnsHandle;
  SetAllocCallbacks(aAllocCallbacks);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 destructor TvkuDeviceMemory.Destroy;
 begin
  if OwnsHandle and (fHandle <> VK_INVALID_NDP_HANDLE) then
    fDeviceCommands.vkFreeMemory(fDeviceCommands.Device, fHandle, AllocCallbacks);
  fHandle := VK_INVALID_NDP_HANDLE;
  inherited Destroy;
 end;
 end.
--- a/projects/utils/uvkuImage.pas
+++ b/projects/utils/uvkuImage.pas
@@ -0,0 +1,177 @@
 unit uvkuImage;
 {$mode objfpc}{$H+}
 interface
 uses
  Classes, SysUtils,
  Vulkan, uvkuBase;
 type
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  TvkuImage = class(TvkuAllocHandle)
  private
    fHandle: VkImage;
    fDeviceCommands: TVkDeviceCommands;
    procedure CreateHandle(const aCreateInfo: TVkImageCreateInfo);
  public
    property Handle:          VkImage           read fHandle;
    property DeviceCommands:  TVkDeviceCommands read fDeviceCommands;
    function GetMemoryBarrier(
      const aAspectMask: VkImageAspectFlags;
      const aOldLayout: TVkImageLayout;
      const aNewLayout: TVkImageLayout): TVkImageMemoryBarrier;
    constructor Create(
      const aCreateInfo: TVkImageCreateInfo;
      const aDeviceCommands: TVkDeviceCommands;
      const aAllocCallbacks: PVkAllocationCallbacks = nil);
    constructor Create(
      const aHandle: VkImage;
      const aOwnsHandle: Boolean;
      const aDeviceCommands: TVkDeviceCommands;
      const aAllocCallbacks: PVkAllocationCallbacks = nil);
    destructor Destroy; override;
  end;
 implementation
 uses
  uvkuUtils;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 //TvkuImage//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 procedure TvkuImage.CreateHandle(const aCreateInfo: TVkImageCreateInfo);
 var err: TVkResult;
 begin
  err := fDeviceCommands.vkCreateImage(fDeviceCommands.Device, @aCreateInfo, AllocCallbacks, @fHandle);
  if (err < VK_SUCCESS) then
    TvkuErrorException.Create('unable to create image', err);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 function TvkuImage.GetMemoryBarrier(
  const aAspectMask: VkImageAspectFlags;
  const aOldLayout: TVkImageLayout;
  const aNewLayout: TVkImageLayout): TVkImageMemoryBarrier;
 var
  range: TVkImageSubresourceRange;
 begin
  FillByte(range, SizeOf(range), 0);
  range.aspectMask      := aAspectMask;
  range.baseMipLevel    := 0;
  range.levelCount      := 1;
  range.baseArrayLayer  := 0;
  range.layerCount      := 1;
  FillByte(result, SizeOf(result), 0);
  result.sType                := VK_STRUCTURE_TYPE_IMAGE_MEMORY_BARRIER;
  result.pNext                := nil;
  result.srcAccessMask        := [];
  result.dstAccessMask        := [];
  result.oldLayout            := aOldLayout;
  result.newLayout            := aNewLayout;
  result.srcQueueFamilyIndex  := 0;
  result.dstQueueFamilyIndex  := 0;
  result.image                := fHandle;
  result.subresourceRange     := range;
  case aOldLayout of
    // Undefined layout:
    //   Note: Only allowed as initial layout!
    //   Note: Make sure any writes to the image have been finished
    VK_IMAGE_LAYOUT_UNDEFINED: begin
      result.srcAccessMask := [ VK_ACCESS_HOST_WRITE_BIT, VK_ACCESS_TRANSFER_WRITE_BIT ];
    end;
    // Old layout is color attachment:
    //   Note: Make sure any writes to the color buffer have been finished
    VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL: begin
      result.srcAccessMask := [ VK_ACCESS_COLOR_ATTACHMENT_WRITE_BIT ];
    end;
    // Old layout is transfer source:
    //   Note: Make sure any reads from the image have been finished
    VK_IMAGE_LAYOUT_TRANSFER_SRC_OPTIMAL: begin
      result.srcAccessMask := [ VK_ACCESS_TRANSFER_READ_BIT ];
    end;
    // Old layout is shader read (sampler, input attachment):
    //   Note: Make sure any shader reads from the image have been finished
    VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL: begin
      result.srcAccessMask := [ VK_ACCESS_SHADER_READ_BIT ];
    end;
  end;
  case aNewLayout of
    // New layout is transfer destination (copy, blit):
    //   Note: Make sure any copyies to the image have been finished
    VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL: begin
      result.dstAccessMask := [ VK_ACCESS_TRANSFER_WRITE_BIT ];
    end;
    // New layout is transfer source (copy, blit):
    //   Note: Make sure any reads from and writes to the image have been finished
    VK_IMAGE_LAYOUT_TRANSFER_SRC_OPTIMAL: begin
      result.srcAccessMask := result.srcAccessMask + [ VK_ACCESS_TRANSFER_READ_BIT ];
      result.dstAccessMask := [ VK_ACCESS_TRANSFER_READ_BIT ];
    end;
    // New layout is color attachment:
    //   Note: Make sure any writes to the color buffer hav been finished
    VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL: begin
      result.dstAccessMask := [ VK_ACCESS_COLOR_ATTACHMENT_WRITE_BIT ];
      result.srcAccessMask := [ VK_ACCESS_TRANSFER_READ_BIT ];
    end;
    // New layout is depth attachment:
    //   Note: Make sure any writes to depth/stencil buffer have been finished
    VK_IMAGE_LAYOUT_DEPTH_STENCIL_ATTACHMENT_OPTIMAL: begin
      result.dstAccessMask := result.dstAccessMask + [ VK_ACCESS_DEPTH_STENCIL_ATTACHMENT_WRITE_BIT ];
    end;
    // New layout is shader read (sampler, input attachment):
    //   Note: Make sure any writes to the image have been finished
    VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL: begin
      result.srcAccessMask := [ VK_ACCESS_HOST_WRITE_BIT, VK_ACCESS_TRANSFER_WRITE_BIT ];
      result.dstAccessMask := [ VK_ACCESS_SHADER_READ_BIT ];
    end;
  end;
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 constructor TvkuImage.Create(const aCreateInfo: TVkImageCreateInfo; const aDeviceCommands: TVkDeviceCommands;
  const aAllocCallbacks: PVkAllocationCallbacks);
 begin
  inherited Create;
  fDeviceCommands := aDeviceCommands;
  SetAllocCallbacks(aAllocCallbacks);
  CreateHandle(aCreateInfo);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 constructor TvkuImage.Create(const aHandle: VkImage; const aOwnsHandle: Boolean;
  const aDeviceCommands: TVkDeviceCommands; const aAllocCallbacks: PVkAllocationCallbacks);
 begin
  inherited Create;
  fHandle         := aHandle;
  fDeviceCommands := aDeviceCommands;
  OwnsHandle      := aOwnsHandle;
  SetAllocCallbacks(aAllocCallbacks);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 destructor TvkuImage.Destroy;
 begin
  if OwnsHandle and (fHandle <> VK_INVALID_NDP_HANDLE) then
    fDeviceCommands.vkDestroyImage(fDeviceCommands.Device, fHandle, AllocCallbacks);
  fHandle := VK_INVALID_NDP_HANDLE;
  inherited Destroy;
 end;
 end.
--- a/projects/utils/uvkuImageFactory.pas
+++ b/projects/utils/uvkuImageFactory.pas
@@ -0,0 +1,161 @@
 unit uvkuImageFactory;
 {$mode objfpc}{$H+}
 interface
 uses
  Classes, SysUtils,
  Vulkan, uvkuImage, uvkuDevice, uvkuAllocationHandler, uvkuTypes;
 type
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  TvkuImageEx = class(TvkuImage)
  private
    fAllocHandler: TvkuAllocationHandler;
    fOwnsHandle: Boolean;
  public
    destructor Destroy; override;
  end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  TvkuImageFactory = class(TObject)
  private
    fDeviceCommands: TVkDeviceCommands;
    fFlags: VkImageCreateFlags;
    fImageType: TVkImageType;
    fFormat: TVkFormat;
    fExtent: TVkExtent3D;
    fMipLevels: VkUint32;
    fArrayLayers: VkUint32;
    fSamples: TVkSampleCountFlagBits;
    fTiling: TVkImageTiling;
    fUsage: VkImageUsageFlags;
    fSharingMode: TVkSharingMode;
    fQueueFamilyIndices: TvkuUint32Arr;
    fInitialLayout: TVkImageLayout;
    function GetQueueFamilyIndex(const aIndex: Integer): VkUint32;
    function GetQueueFamilyIndexCount: Integer;
    procedure SetQueueFamilyIndex(const aIndex: Integer; aValue: VkUint32);
  public
    property DeviceCommands:  TVkDeviceCommands       read fDeviceCommands;
    property Flags:           VkImageCreateFlags      read fFlags         write fFlags;
    property ImageType:       TVkImageType            read fImageType     write fImageType;
    property Format:          TVkFormat               read fFormat        write fFormat;
    property Extent:          TVkExtent3D             read fExtent        write fExtent;
    property MipLevels:       VkUint32                read fMipLevels     write fMipLevels;
    property ArrayLayers:     VkUint32                read fArrayLayers   write fArrayLayers;
    property Samples:         TVkSampleCountFlagBits  read fSamples       write fSamples;
    property Tiling:          TVkImageTiling          read fTiling        write fTiling;
    property Usage:           VkImageUsageFlags       read fUsage         write fUsage;
    property SharingMode:     TVkSharingMode          read fSharingMode   write fSharingMode;
    property InitialLayout:   TVkImageLayout          read fInitialLayout write fInitialLayout;
    property QueueFamilyIndices: TvkuUint32Arr read fQueueFamilyIndices;
    property QueueFamilyIndexCount: Integer read GetQueueFamilyIndexCount;
    property QueueFamilyIndex[const aIndex: Integer]: VkUint32 read GetQueueFamilyIndex write SetQueueFamilyIndex;
    function CreateImage: TvkuImageEx;
    function CreateImage(
      const aAllocHandler: TvkuAllocationHandler;
      const aOwnsHandler: Boolean): TvkuImageEx;
    constructor Create(const aDevice: TvkuDevice);
    constructor Create(const aDeviceCommands: TVkDeviceCommands);
  end;
 implementation
 uses
  uvkuUtils;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 //TvkuImageEx////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 destructor TvkuImageEx.Destroy;
 begin
  if fOwnsHandle then
    FreeAndNil(fAllocHandler);
  inherited Destroy;
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 //TvkuImageFactory///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 function TvkuImageFactory.GetQueueFamilyIndex(const aIndex: Integer): VkUint32;
 begin
  if (aIndex < low(fQueueFamilyIndices)) or (aIndex > high(fQueueFamilyIndices)) then
    raise TvkuException.CreateFmt('index (%d) out of range (%d : %d)', [aIndex, Low(fQueueFamilyIndices), High(fQueueFamilyIndices)]);
  result := fQueueFamilyIndices[aIndex];
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 function TvkuImageFactory.GetQueueFamilyIndexCount: Integer;
 begin
  result := Length(fQueueFamilyIndices);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 procedure TvkuImageFactory.SetQueueFamilyIndex(const aIndex: Integer; aValue: VkUint32);
 begin
  if (aIndex < low(fQueueFamilyIndices)) or (aIndex > high(fQueueFamilyIndices)) then
    raise TvkuException.CreateFmt('index (%d) out of range (%d : %d)', [aIndex, Low(fQueueFamilyIndices), High(fQueueFamilyIndices)]);
  fQueueFamilyIndices[aIndex] := aValue;
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 function TvkuImageFactory.CreateImage: TvkuImageEx;
 begin
  result := CreateImage(nil, false);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 function TvkuImageFactory.CreateImage(const aAllocHandler: TvkuAllocationHandler; const aOwnsHandler: Boolean): TvkuImageEx;
 var
  CreateInfo: TVkImageCreateInfo;
 begin
  FillByte(CreateInfo, 0, SizeOf(CreateInfo));
  CreateInfo.sType                 := VK_STRUCTURE_TYPE_IMAGE_CREATE_INFO;
  CreateInfo.pNext                 := nil;
  CreateInfo.flags                 := fFlags;
  CreateInfo.imageType             := fImageType;
  CreateInfo.format                := fFormat;
  CreateInfo.extent                := fExtent;
  CreateInfo.mipLevels             := fMipLevels;
  CreateInfo.arrayLayers           := fArrayLayers;
  CreateInfo.samples               := fSamples;
  CreateInfo.tiling                := fTiling;
  CreateInfo.usage                 := fUsage;
  CreateInfo.sharingMode           := fSharingMode;
  CreateInfo.queueFamilyIndexCount := Length(fQueueFamilyIndices);
  CreateInfo.pQueueFamilyIndices   := @fQueueFamilyIndices[0];
  CreateInfo.initialLayout         := fInitialLayout;
  if Assigned(aAllocHandler)
    then result := TvkuImageEx.Create(CreateInfo, fDeviceCommands, aAllocHandler.GetAllocationCallbacksPtr)
    else result := TvkuImageEx.Create(CreateInfo, fDeviceCommands);
  try
    TvkuImageEx(result).fAllocHandler := aAllocHandler;
    TvkuImageEx(result).fOwnsHandle   := aOwnsHandler;
  except
    FreeAndNil(result);
    raise;
  end;
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 constructor TvkuImageFactory.Create(const aDevice: TvkuDevice);
 begin
  Create(aDevice.DeviceCommands);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 constructor TvkuImageFactory.Create(const aDeviceCommands: TVkDeviceCommands);
 begin
  inherited Create;
  fDeviceCommands := aDeviceCommands;
 end;
 end.
--- a/projects/utils/uvkuImageView.pas
+++ b/projects/utils/uvkuImageView.pas
@@ -0,0 +1,84 @@
 unit uvkuImageView;
 {$mode objfpc}{$H+}
 interface
 uses
  Classes, SysUtils,
  Vulkan, uvkuBase;
 type
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  TvkuImageView = class(TvkuAllocHandle)
  private
    fHandle: VkImageView;
    fDeviceCommands: TVkDeviceCommands;
    procedure CreateHandle(const aCreateInfo: TVkImageViewCreateInfo);
  public
    property Handle:          VkImageView       read fHandle;
    property DeviceCommands:  TVkDeviceCommands read fDeviceCommands;
    constructor Create(
      const aCreateInfo: TVkImageViewCreateInfo;
      const aDeviceCommands: TVkDeviceCommands;
      const aAllocCallbacks: PVkAllocationCallbacks = nil);
    constructor Create(
      const aHandle: VkImageView;
      const aOwnsHandle: Boolean;
      const aDeviceCommands: TVkDeviceCommands;
      const aAllocCallbacks: PVkAllocationCallbacks = nil);
    destructor Destroy; override;
  end;
 implementation
 uses
  uvkuUtils;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 //TvkuImageView//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 procedure TvkuImageView.CreateHandle(const aCreateInfo: TVkImageViewCreateInfo);
 var err: TVkResult;
 begin
  if not Assigned(fDeviceCommands.vkCreateImageView) then
    raise TvkuInvalidFuncPtrException.Create('vkCreateImageView');
  err := fDeviceCommands.vkCreateImageView(fDeviceCommands.Device, @aCreateInfo, AllocCallbacks, @fHandle);
  if (err < VK_SUCCESS) then
    raise TvkuErrorException.Create('unable to create image view', err);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 constructor TvkuImageView.Create(const aCreateInfo: TVkImageViewCreateInfo; const aDeviceCommands: TVkDeviceCommands;
  const aAllocCallbacks: PVkAllocationCallbacks);
 begin
  inherited Create;
  fDeviceCommands := aDeviceCommands;
  SetAllocCallbacks(aAllocCallbacks);
  CreateHandle(aCreateInfo);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 constructor TvkuImageView.Create(const aHandle: VkImageView; const aOwnsHandle: Boolean;
  const aDeviceCommands: TVkDeviceCommands; const aAllocCallbacks: PVkAllocationCallbacks);
 begin
  inherited Create;
  fHandle         := aHandle;
  fDeviceCommands := aDeviceCommands;
  OwnsHandle      := aOwnsHandle;
  SetAllocCallbacks(aAllocCallbacks);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 destructor TvkuImageView.Destroy;
 begin
  if OwnsHandle and (fHandle <> VK_INVALID_NDP_HANDLE) then
    fDeviceCommands.vkDestroyImageView(fDeviceCommands.Device, fHandle, AllocCallbacks);
  fHandle := VK_INVALID_NDP_HANDLE;
  inherited Destroy;
 end;
 end.
--- a/projects/utils/uvkuImageViewFactory.pas
+++ b/projects/utils/uvkuImageViewFactory.pas
@@ -0,0 +1,110 @@
 unit uvkuImageViewFactory;
 {$mode objfpc}{$H+}
 interface
 uses
  Classes, SysUtils,
  Vulkan, uvkuAllocationHandler, uvkuImageView, uvkuDevice;
 type
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  TvkuImageViewEx = class(TvkuImageView)
  private
    fAllocHandler: TvkuAllocationHandler;
    fOwnsHandler: Boolean;
  public
    destructor Destroy; override;
  end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  TvkuImageViewFactory = class(TObject)
  private
    fDeviceCommands: TVkDeviceCommands;
    fFlags: VkImageViewCreateFlags;
    fImage: VkImage;
    fViewType: TVkImageViewType;
    fFormat: TVkFormat;
    fComponents: TVkComponentMapping;
    fSubresourceRange: TVkImageSubresourceRange;
  public
    property DeviceCommands:    TVkDeviceCommands         read fDeviceCommands;
    property Flags:             VkImageViewCreateFlags    read fFlags             write fFlags;
    property Image:             VkImage                   read fImage             write fImage;
    property ViewType:          TVkImageViewType          read fViewType          write fViewType;
    property Format:            TVkFormat                 read fFormat            write fFormat;
    property Components:        TVkComponentMapping       read fComponents        write fComponents;
    property SubresourceRange:  TVkImageSubresourceRange  read fSubresourceRange  write fSubresourceRange;
    function CreateImageView: TvkuImageViewEx;
    function CreateImageView(
      const aAllocHandler: TvkuAllocationHandler;
      const aOwnsHandler: Boolean): TvkuImageViewEx;
    constructor Create(const aDevice: TvkuDevice);
    constructor Create(const aDeviceCommands: TVkDeviceCommands);
  end;
 implementation
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 //TvkuImageViewEx////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 destructor TvkuImageViewEx.Destroy;
 begin
  inherited Destroy;
  if fOwnsHandler then
    FreeAndNil(fAllocHandler);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 //TvkuImageViewFactory///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 function TvkuImageViewFactory.CreateImageView: TvkuImageViewEx;
 begin
  result := CreateImageView(nil, false);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 function TvkuImageViewFactory.CreateImageView(const aAllocHandler: TvkuAllocationHandler; const aOwnsHandler: Boolean): TvkuImageViewEx;
 var CreateInfo: TVkImageViewCreateInfo;
 begin
  FillByte(CreateInfo, SizeOf(CreateInfo), 0);
  CreateInfo.sType            := VK_STRUCTURE_TYPE_IMAGE_VIEW_CREATE_INFO;
  CreateInfo.pNext            := nil;
  CreateInfo.flags            := fFlags;
  CreateInfo.image            := fImage;
  CreateInfo.viewType         := fViewType;
  CreateInfo.format           := fFormat;
  CreateInfo.components       := fComponents;
  CreateInfo.subresourceRange := fSubresourceRange;
  if Assigned(aAllocHandler)
    then result := TvkuImageViewEx.Create(CreateInfo, fDeviceCommands, aAllocHandler.GetAllocationCallbacksPtr)
    else result := TvkuImageViewEx.Create(CreateInfo, fDeviceCommands);
  try
    TvkuImageViewEx(result).fAllocHandler := aAllocHandler;
    TvkuImageViewEx(result).fOwnsHandler  := aOwnsHandler;
  except
    FreeAndNil(result);
    raise;
  end;
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 constructor TvkuImageViewFactory.Create(const aDevice: TvkuDevice);
 begin
  Create(aDevice.DeviceCommands);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 constructor TvkuImageViewFactory.Create(const aDeviceCommands: TVkDeviceCommands);
 begin
  inherited Create;
  fDeviceCommands := aDeviceCommands;
 end;
 end.
--- a/projects/utils/uvkuInstance.pas
+++ b/projects/utils/uvkuInstance.pas
@@ -6,35 +6,32 @@ interface
 uses
  Classes, SysUtils,
  Vulkan;
  Vulkan, uvkuBase, uvkuTypes;
 type
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  TvkuPhysicalDeviceArr = array of VkPhysicalDevice;
  TvkuInstance = class(TObject)
  TvkuInstance = class(TvkuAllocHandle)
  private
    fHandle:            VkInstance;
    fAllocCallbacks:    PVkAllocationCallbacks;
    fPhysicalDevices:   TvkuPhysicalDeviceArr;
    fInstanceCommands:  TVkInstanceCommands;
    procedure UpdatePhysicalDevices;
  protected
    procedure CreateHandle(const aCreateInfo: PVkInstanceCreateInfo; const aAllocCallbacks: PVkAllocationCallbacks);
    {%H-}constructor Create;
    procedure CreateHandle(const aCreateInfo: PVkInstanceCreateInfo);
  public
    property Handle:                                VkInstance            read fHandle;
    property InstanceCommands:                      TVkInstanceCommands   read fInstanceCommands;
    function GetPhysicalDevices: TvkuPhysicalDeviceArr;
    constructor Create(
      const aCreateInfo: TVkInstanceCreateInfo);
    constructor Create(
      const aCreateInfo: TVkInstanceCreateInfo;
      const aAllocCallbacks: TVkAllocationCallbacks);
      const aAllocCallbacks: PVkAllocationCallbacks = nil);
    constructor Create(
      const aHandle: VkInstance;
      const aOwnsHandle: Boolean;
      const aAllocCallbacks: PVkAllocationCallbacks = nil);
    destructor Destroy; override;
  end;
@@ -65,14 +62,10 @@ begin
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 procedure TvkuInstance.CreateHandle(const aCreateInfo: PVkInstanceCreateInfo; const aAllocCallbacks: PVkAllocationCallbacks);
 procedure TvkuInstance.CreateHandle(const aCreateInfo: PVkInstanceCreateInfo);
 var e: TVkResult;
 begin
  if Assigned(aAllocCallbacks) then begin
    new(fAllocCallbacks);
    fAllocCallbacks^ := aAllocCallbacks^;
  end;
  e := vkCreateInstance(aCreateInfo, fAllocCallbacks, @fHandle);
  e := vkCreateInstance(aCreateInfo, AllocCallbacks, @fHandle);
  if (e < VK_SUCCESS) then
    raise TvkuErrorException.Create('unable to create vulkan instance', e);
  fInstanceCommands := LoadInstanceCommands(fHandle);
@@ -80,14 +73,6 @@ begin
    raise TvkuException.Create('unable to load instance commands');
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 constructor TvkuInstance.Create;
 begin
  inherited Create;
  fHandle         := nil;
  fAllocCallbacks := nil;
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 function TvkuInstance.GetPhysicalDevices: TvkuPhysicalDeviceArr;
 begin
@@ -96,30 +81,29 @@ begin
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 constructor TvkuInstance.Create(const aCreateInfo: TVkInstanceCreateInfo);
 constructor TvkuInstance.Create(const aCreateInfo: TVkInstanceCreateInfo; const aAllocCallbacks: PVkAllocationCallbacks);
 begin
  Create;
  CreateHandle(@aCreateInfo, nil);
  inherited Create;
  fHandle := VK_INVALID_HANDLE;
  SetAllocCallbacks(aAllocCallbacks);
  CreateHandle(@aCreateInfo);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 constructor TvkuInstance.Create(const aCreateInfo: TVkInstanceCreateInfo; const aAllocCallbacks: TVkAllocationCallbacks);
 constructor TvkuInstance.Create(const aHandle: VkInstance; const aOwnsHandle: Boolean; const aAllocCallbacks: PVkAllocationCallbacks);
 begin
  Create;
  CreateHandle(@aCreateInfo, @aAllocCallbacks);
  inherited Create;
  fHandle    := aHandle;
  OwnsHandle := aOwnsHandle;
  SetAllocCallbacks(aAllocCallbacks);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 destructor TvkuInstance.Destroy;
 begin
  if (fHandle <> VK_INVALID_HANDLE) then begin
    InstanceCommands.vkDestroyInstance(fHandle, fAllocCallbacks);
    fHandle := VK_INVALID_HANDLE;
  end;
  if Assigned(fAllocCallbacks) then begin
    Dispose(fAllocCallbacks);
    fAllocCallbacks := nil;
  end;
  if OwnsHandle and (fHandle <> VK_INVALID_HANDLE) then
    InstanceCommands.vkDestroyInstance(fHandle, AllocCallbacks);
  fHandle := VK_INVALID_HANDLE;
  FreeAndNil(fInstanceCommands);
  inherited Destroy;
 end;
--- a/projects/utils/uvkuInstanceFactory.pas
+++ b/projects/utils/uvkuInstanceFactory.pas
@@ -7,18 +7,9 @@ interface
 uses
  Classes, SysUtils,
  Vulkan, uvkuInstance, uvkuAllocationHandler;
  Vulkan, uvkuInstance, uvkuAllocationHandler, uvkuTypes;
 type
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  TvkuApplicationInfo = packed record
    AppName:        String;
    AppVersion:     VkVersion;
    EngineName:     String;
    EngineVersion:  VkVersion;
    ApiVersion:     VkVersion;
  end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  TvkuInstanceEx = class(TvkuInstance)
  private
@@ -45,10 +36,10 @@ type
    property Layers:          TStrings              read GetLayers;
    property Extensions:      TStrings              read GetExtensions;
    function CreateInstance: TvkuInstance;
    function CreateInstance: TvkuInstanceEx;
    function CreateInstance(
      const aAllocHandler: TvkuAllocationHandler;
      const aOwnsHandler: Boolean): TvkuInstance;
      const aOwnsHandler: Boolean): TvkuInstanceEx;
    constructor Create;
    destructor Destroy; override;
@@ -110,13 +101,13 @@ begin
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 function TvkuInstanceFactory.CreateInstance: TvkuInstance;
 function TvkuInstanceFactory.CreateInstance: TvkuInstanceEx;
 begin
  result := CreateInstance(nil, false);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 function TvkuInstanceFactory.CreateInstance(const aAllocHandler: TvkuAllocationHandler; const aOwnsHandler: Boolean): TvkuInstance;
 function TvkuInstanceFactory.CreateInstance(const aAllocHandler: TvkuAllocationHandler; const aOwnsHandler: Boolean): TvkuInstanceEx;
 var
  CreateInfo: TVkInstanceCreateInfo;
  AppInfo: TVkApplicationInfo;
@@ -152,7 +143,7 @@ begin
  CreateInfo.ppEnabledExtensionNames  := @ext[0];
  if Assigned(aAllocHandler)
    then result := TvkuInstanceEx.Create(CreateInfo, aAllocHandler.GetAllocationCallbacks)
    then result := TvkuInstanceEx.Create(CreateInfo, aAllocHandler.GetAllocationCallbacksPtr)
    else result := TvkuInstanceEx.Create(CreateInfo);
  try
    TvkuInstanceEx(result).fAllocHandler := aAllocHandler;
--- a/projects/utils/uvkuPhysicalDevice.pas
+++ b/projects/utils/uvkuPhysicalDevice.pas
@@ -6,20 +6,11 @@ interface
 uses
  Classes, SysUtils,
  Vulkan, uvkuInstance;
  Vulkan, uvkuBase, uvkuTypes;
 type
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  TvkuQueueFamilyPropertiesArr       = array of TVkQueueFamilyProperties;
  TvkuSparseImageFormatPropertiesArr = array of TVkSparseImageFormatProperties;
  TvkuSurfaceFormatArr               = array of TVkSurfaceFormatKHR;
  TvkuPresentModeArr                 = array of TVkPresentModeKHR;
  TvkuDisplayPropertiesArr           = array of TVkDisplayPropertiesKHR;
  TvkuDisplayPlanePropertiesArr      = array of TVkDisplayPlanePropertiesKHR;
  TvkuDisplayArr                     = array of VkDisplayKHR;
  TvkuDisplayModePropertiesArr       = array of TVkDisplayModePropertiesKHR;
  TvkuPhysicalDevice = class(TObject)
  TvkuPhysicalDevice = class(TvkuObject)
  private
    fHandle: VkPhysicalDevice;
    fInstanceCommands: TVkInstanceCommands;
@@ -59,7 +50,9 @@ type
    property Handle:            VkPhysicalDevice    read fHandle;
    property InstanceCommands:  TVkInstanceCommands read fInstanceCommands;
    constructor Create(const aHandle: VkPhysicalDevice; const aInstanceCommands: TVkInstanceCommands);
    constructor Create(
      const aHandle: VkPhysicalDevice;
      const aInstanceCommands: TVkInstanceCommands);
  end;
 implementation
@@ -73,7 +66,7 @@ uses
 function TvkuPhysicalDevice.GetFeatures: TVkPhysicalDeviceFeatures;
 begin
  if not Assigned(fInstanceCommands.vkGetPhysicalDeviceFeatures) then
    raise TvkuException.Create('invalid function pointer: vkGetPhysicalDeviceFeatures; did you load the vulkan core commands?');
    raise TvkuInvalidFuncPtrException.Create('vkGetPhysicalDeviceFeatures');
  fInstanceCommands.vkGetPhysicalDeviceFeatures(fHandle, @result);
 end;
@@ -81,7 +74,7 @@ end;
 function TvkuPhysicalDevice.GetProperties: TVkPhysicalDeviceProperties;
 begin
  if not Assigned(fInstanceCommands.vkGetPhysicalDeviceProperties) then
    raise TvkuException.Create('invalid function pointer: vkGetPhysicalDeviceProperties; did you load the vulkan core commands?');
    raise TvkuInvalidFuncPtrException.Create('vkGetPhysicalDeviceProperties');
  fInstanceCommands.vkGetPhysicalDeviceProperties(fHandle, @result);
 end;
@@ -89,7 +82,7 @@ end;
 function TvkuPhysicalDevice.GetMemoryProperties: TVkPhysicalDeviceMemoryProperties;
 begin
  if not Assigned(fInstanceCommands.vkGetPhysicalDeviceMemoryProperties) then
    raise TvkuException.Create('invalid function pointer: vkGetPhysicalDeviceMemoryProperties; did you load the vulkan core commands?');
    raise TvkuInvalidFuncPtrException.Create('vkGetPhysicalDeviceMemoryProperties');
  fInstanceCommands.vkGetPhysicalDeviceMemoryProperties(fHandle, @result);
 end;
@@ -99,7 +92,7 @@ var c: VkUint32;
 begin
  result := nil;
  if not Assigned(fInstanceCommands.vkGetPhysicalDeviceQueueFamilyProperties) then
    raise TvkuException.Create('invalid function pointer: vkGetPhysicalDeviceQueueFamilyProperties; did you load the vulkan core commands?');
    raise TvkuInvalidFuncPtrException.Create('vkGetPhysicalDeviceQueueFamilyProperties');
  fInstanceCommands.vkGetPhysicalDeviceQueueFamilyProperties(fHandle, @c, nil);
  SetLength(result, c);
  fInstanceCommands.vkGetPhysicalDeviceQueueFamilyProperties(fHandle, @c, @result[0]);
@@ -109,7 +102,7 @@ end;
 function TvkuPhysicalDevice.GetFormatProperties(const aFormat: TVkFormat): TVkFormatProperties;
 begin
  if not Assigned(fInstanceCommands.vkGetPhysicalDeviceFormatProperties) then
    raise TvkuException.Create('invalid function pointer: vkGetPhysicalDeviceFormatProperties; did you load the vulkan core commands?');
    raise TvkuInvalidFuncPtrException.Create('vkGetPhysicalDeviceFormatProperties');
  fInstanceCommands.vkGetPhysicalDeviceFormatProperties(fHandle, aFormat, @result);
 end;
@@ -119,7 +112,7 @@ function TvkuPhysicalDevice.GetImageFormatProperties(const aFormat: TVkFormat; c
 var err: TVkResult;
 begin
  if not Assigned(fInstanceCommands.vkGetPhysicalDeviceImageFormatProperties) then
    raise TvkuException.Create('invalid function pointer: vkGetPhysicalDeviceImageFormatProperties; did you load the vulkan core commands?');
    raise TvkuInvalidFuncPtrException.Create('vkGetPhysicalDeviceImageFormatProperties');
  err := fInstanceCommands.vkGetPhysicalDeviceImageFormatProperties(fHandle, aFormat, aImageType, aTiling, aUsage, aFlags, @result);
  if (err < VK_SUCCESS) then
    raise TvkuErrorException.Create('unable to get physical device image format properties', err);
@@ -132,7 +125,7 @@ var c: VkUint32;
 begin
  result := nil;
  if not Assigned(fInstanceCommands.vkGetPhysicalDeviceSparseImageFormatProperties) then
    raise TvkuException.Create('invalid function pointer: vkGetPhysicalDeviceSparseImageFormatProperties; did you load the vulkan core commands?');
    raise TvkuInvalidFuncPtrException.Create('vkGetPhysicalDeviceSparseImageFormatProperties');
  fInstanceCommands.vkGetPhysicalDeviceSparseImageFormatProperties(fHandle, aFormat, aImageType, aSamples, aUsage, aTiling, @c, nil);
  SetLength(result, c);
  fInstanceCommands.vkGetPhysicalDeviceSparseImageFormatProperties(fHandle, aFormat, aImageType, aSamples, aUsage, aTiling, @c, @result[0]);
@@ -145,7 +138,7 @@ var
  err: TVkResult;
 begin
  if not Assigned(fInstanceCommands.vkGetPhysicalDeviceSurfaceSupportKHR) then
    raise TvkuException.Create('invalid function pointer: vkGetPhysicalDeviceSurfaceSupportKHR; did you enabled the VK_KHR_surface extension?');
    raise TvkuInvalidFuncPtrException.Create('vkGetPhysicalDeviceSurfaceSupportKHR', 'VK_KHR_surface');
  err := fInstanceCommands.vkGetPhysicalDeviceSurfaceSupportKHR(fHandle, aQueueFamilyIndex, aSurface, @b);
  if (err < VK_SUCCESS) then
    raise TvkuErrorException.Create('unable to get physical device surface support', err);
@@ -158,7 +151,7 @@ var
  err: TVkResult;
 begin
  if not Assigned(fInstanceCommands.vkGetPhysicalDeviceSurfaceCapabilitiesKHR) then
    raise TvkuException.Create('invalid function pointer: vkGetPhysicalDeviceSurfaceCapabilitiesKHR; did you enabled the VK_KHR_surface extension?');
    raise TvkuInvalidFuncPtrException.Create('vkGetPhysicalDeviceSurfaceCapabilitiesKHR', 'VK_KHR_surface');
  err := fInstanceCommands.vkGetPhysicalDeviceSurfaceCapabilitiesKHR(fHandle, aSurface, @result);
  if (err < VK_SUCCESS) then
    raise TvkuErrorException.Create('unable to get physical device surface capabilities', err);
@@ -170,7 +163,7 @@ var c: VkUint32;
 begin
  result := nil;
  if not Assigned(fInstanceCommands.vkGetPhysicalDeviceSurfaceFormatsKHR) then
    raise TvkuException.Create('invalid function pointer: vkGetPhysicalDeviceSurfaceFormatsKHR; did you enabled the VK_KHR_surface extension?');
    raise TvkuInvalidFuncPtrException.Create('vkGetPhysicalDeviceSurfaceFormatsKHR', 'VK_KHR_surface');
  fInstanceCommands.vkGetPhysicalDeviceSurfaceFormatsKHR(fHandle, aSurface, @c, nil);
  SetLength(result, c);
  fInstanceCommands.vkGetPhysicalDeviceSurfaceFormatsKHR(fHandle, aSurface, @c, @result[0]);
@@ -184,7 +177,7 @@ var
 begin
  result := nil;
  if not Assigned(fInstanceCommands.vkGetPhysicalDeviceSurfacePresentModesKHR) then
    raise TvkuException.Create('invalid function pointer: vkGetPhysicalDeviceSurfacePresentModesKHR; did you enabled the VK_KHR_surface extension?');
    raise TvkuInvalidFuncPtrException.Create('vkGetPhysicalDeviceSurfacePresentModesKHR', 'VK_KHR_surface');
  err := fInstanceCommands.vkGetPhysicalDeviceSurfacePresentModesKHR(fHandle, aSurface, @c, nil);
  if (err < VK_SUCCESS) then
    raise TvkuErrorException.Create('unable to get physical device surface present mode count', err);
@@ -202,7 +195,7 @@ var
 begin
  result := nil;
  if not Assigned(fInstanceCommands.vkGetPhysicalDeviceDisplayPropertiesKHR) then
    raise TvkuException.Create('invalid function pointer: vkGetPhysicalDeviceDisplayPropertiesKHR; did you enabled the VK_KHR_display extension?');
    raise TvkuInvalidFuncPtrException.Create('vkGetPhysicalDeviceDisplayPropertiesKHR', 'VK_KHR_display');
  err := fInstanceCommands.vkGetPhysicalDeviceDisplayPropertiesKHR(fHandle, @c, nil);
  if (err < VK_SUCCESS) then
    raise TvkuErrorException.Create('unable to get physical device display property count', err);
@@ -220,7 +213,7 @@ var
 begin
  result := nil;
  if not Assigned(fInstanceCommands.vkGetPhysicalDeviceDisplayPlanePropertiesKHR) then
    raise TvkuException.Create('invalid function pointer: vkGetPhysicalDeviceDisplayPlanePropertiesKHR; did you enabled the VK_KHR_display extension?');
    raise TvkuInvalidFuncPtrException.Create('vkGetPhysicalDeviceDisplayPlanePropertiesKHR', 'VK_KHR_display');
  err := fInstanceCommands.vkGetPhysicalDeviceDisplayPlanePropertiesKHR(fHandle, @c, nil);
  if (err < VK_SUCCESS) then
    raise TvkuErrorException.Create('unable to get physical device display plane property count', err);
@@ -238,7 +231,7 @@ var
 begin
  result := nil;
  if not Assigned(fInstanceCommands.vkGetDisplayPlaneSupportedDisplaysKHR) then
    raise TvkuException.Create('invalid function pointer: vkGetDisplayPlaneSupportedDisplaysKHR; did you enabled the VK_KHR_display extension?');
    raise TvkuInvalidFuncPtrException.Create('vkGetDisplayPlaneSupportedDisplaysKHR', 'VK_KHR_display');
  err := fInstanceCommands.vkGetDisplayPlaneSupportedDisplaysKHR(fHandle, aPlaneIndex, @c, nil);
  if (err < VK_SUCCESS) then
    raise TvkuErrorException.Create('unable to get supported display plane count', err);
@@ -256,7 +249,7 @@ var
 begin
  result := nil;
  if not Assigned(fInstanceCommands.vkGetDisplayModePropertiesKHR) then
    raise TvkuException.Create('invalid function pointer: vkGetDisplayModePropertiesKHR; did you enabled the VK_KHR_display extension?');
    raise TvkuInvalidFuncPtrException.Create('vkGetDisplayModePropertiesKHR', 'VK_KHR_display');
  err := fInstanceCommands.vkGetDisplayModePropertiesKHR(fHandle, aDisplay, @c, nil);
  if (err < VK_SUCCESS) then
    raise TvkuErrorException.Create('unable to get display mode property count', err);
--- a/projects/utils/uvkuPhysicalDeviceFactory.pas
+++ b/projects/utils/uvkuPhysicalDeviceFactory.pas
@@ -1,41 +0,0 @@
 unit uvkuPhysicalDeviceFactory;
 {$mode objfpc}{$H+}
 interface
 uses
  Classes, SysUtils,
  Vulkan, uvkuInstance, uvkuPhysicalDevice;
 type
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  TvkuPhysicalDeviceFactory = class(TObject)
  private
    fInstance: TvkuInstance;
  public
    function CreatePhysicalDevice(
      const aHandle: VkPhysicalDevice): TvkuPhysicalDevice;
    constructor Create(const aInstance: TvkuInstance);
  end;
 implementation
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 //TvkuPhysicalDeviceFactory//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 function TvkuPhysicalDeviceFactory.CreatePhysicalDevice(const aHandle: VkPhysicalDevice): TvkuPhysicalDevice;
 begin
  result := TvkuPhysicalDevice.Create(aHandle, fInstance.InstanceCommands);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 constructor TvkuPhysicalDeviceFactory.Create(const aInstance: TvkuInstance);
 begin
  inherited Create;
  fInstance := aInstance;
 end;
 end.
--- a/projects/utils/uvkuQueue.pas
+++ b/projects/utils/uvkuQueue.pas
@@ -0,0 +1,39 @@
 unit uvkuQueue;
 {$mode objfpc}{$H+}
 interface
 uses
  Classes, SysUtils,
  Vulkan, uvkuBase;
 type
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  TvkuQueue = class(TvkuObject)
  private
    fHandle: VkQueue;
    fDeviceCommands: TVkDeviceCommands;
  public
    property Handle:          VkQueue           read fHandle;
    property DeviceCommands:  TVkDeviceCommands read fDeviceCommands;
    constructor Create(
      const aHandle: VkQueue;
      const aDeviceCommands: TVkDeviceCommands);
  end;
 implementation
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 //TvkuQueue//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 constructor TvkuQueue.Create(const aHandle: VkQueue; const aDeviceCommands: TVkDeviceCommands);
 begin
  inherited Create;
  fHandle         := aHandle;
  fDeviceCommands := aDeviceCommands;
 end;
 end.
--- a/projects/utils/uvkuSurface.pas
+++ b/projects/utils/uvkuSurface.pas
@@ -7,36 +7,34 @@ interface
 uses
  Classes, SysUtils,
  Vulkan;
  Vulkan, uvkuBase;
 type
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  TvkuSurface = class(TObject)
  TvkuSurface = class(TvkuAllocHandle)
  private
    fHandle: VkSurfaceKHR;
    fInstance: VkInstance;
    fAllocCallbacks: PVkAllocationCallbacks;
    fInstanceCommands: TVkInstanceCommands;
    procedure CreateHandle(const aCreateInfo: Pointer; const aAllocCallbacks: PVkAllocationCallbacks);
    procedure CreateHandle(const aCreateInfo: Pointer);
  public
    property Handle:           VkSurfaceKHR        read fHandle;
    property Instance:         VkInstance          read fInstance;
    property InstanceCommands: TVkInstanceCommands read fInstanceCommands;
  {$IF DEFINED(VK_USE_PLATFORM_WIN32_KHR)}
    constructor Create(
      const aInstance: VkInstance;
      const aCreateInfo: TVkWin32SurfaceCreateInfoKHR;
      const aInstanceCommands: TVkInstanceCommands);
    constructor Create(
      const aInstance: VkInstance;
      const aCreateInfo: TVkWin32SurfaceCreateInfoKHR;
      const aInstanceCommands: TVkInstanceCommands;
      const aAllocCallbacks: TVkAllocationCallbacks);
      const aAllocCallbacks: PVkAllocationCallbacks = nil);
  {$ELSE}
    {$ERROR 'unknown or unsupportet platform'}
  {$ENDIF}
    constructor Create(
      const aHandle: VkSurfaceKHR;
      const aOwnsHandle: Boolean;
      const aInstanceCommands: TVkInstanceCommands;
      const aAllocCallbacks: PVkAllocationCallbacks = nil);
    destructor Destroy; override;
  public
    class function GetPlatformSurfaceExtensionName: String;
@@ -50,17 +48,13 @@ uses
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 //TvkuSurface////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 procedure TvkuSurface.CreateHandle(const aCreateInfo: Pointer; const aAllocCallbacks: PVkAllocationCallbacks);
 procedure TvkuSurface.CreateHandle(const aCreateInfo: Pointer);
 var err: TVkResult;
 begin
  if Assigned(aAllocCallbacks) then begin
    new(fAllocCallbacks);
    fAllocCallbacks^ := aAllocCallbacks^;
  end;
 {$IF DEFINED(VK_USE_PLATFORM_WIN32_KHR)}
  if not Assigned(fInstanceCommands.vkCreateWin32SurfaceKHR) then
    raise TvkuException.Create('invalid function pointer: vkCreateWin32SurfaceKHR; did you enabled the VK_KHR_win32_surface extension?');
  err := fInstanceCommands.vkCreateWin32SurfaceKHR(fInstance, aCreateInfo, fAllocCallbacks, @fHandle);
    raise TvkuInvalidFuncPtrException.Create('vkCreateWin32SurfaceKHR', 'VK_KHR_win32_surface');
  err := fInstanceCommands.vkCreateWin32SurfaceKHR(fInstanceCommands.Instance, aCreateInfo, AllocCallbacks, @fHandle);
 {$ENDIF}
  if (err < VK_SUCCESS) then
    raise TvkuErrorException.Create('unable to create surface', err);
@@ -68,37 +62,33 @@ end;
 {$IF DEFINED(VK_USE_PLATFORM_WIN32_KHR)}
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 constructor TvkuSurface.Create(const aInstance: VkInstance; const aCreateInfo: TVkWin32SurfaceCreateInfoKHR;
  const aInstanceCommands: TVkInstanceCommands);
 constructor TvkuSurface.Create(const aCreateInfo: TVkWin32SurfaceCreateInfoKHR;
  const aInstanceCommands: TVkInstanceCommands; const aAllocCallbacks: PVkAllocationCallbacks);
 begin
  inherited Create;
  fInstance         := aInstance;
  fInstanceCommands := aInstanceCommands;
  CreateHandle(@aCreateInfo, nil);
  SetAllocCallbacks(aAllocCallbacks);
  CreateHandle(@aCreateInfo);
 end;
 {$ENDIF}
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 constructor TvkuSurface.Create(const aInstance: VkInstance; const aCreateInfo: TVkWin32SurfaceCreateInfoKHR;
  const aInstanceCommands: TVkInstanceCommands; const aAllocCallbacks: TVkAllocationCallbacks);
 constructor TvkuSurface.Create(const aHandle: VkSurfaceKHR; const aOwnsHandle: Boolean;
  const aInstanceCommands: TVkInstanceCommands; const aAllocCallbacks: PVkAllocationCallbacks);
 begin
  inherited Create;
  fInstance         := aInstance;
  fHandle           := aHandle;
  fInstanceCommands := aInstanceCommands;
  CreateHandle(@aCreateInfo, @aAllocCallbacks);
  OwnsHandle        := aOwnsHandle;
  SetAllocCallbacks(aAllocCallbacks);
 end;
 {$ENDIF}
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 destructor TvkuSurface.Destroy;
 begin
  if (fHandle <> VK_INVALID_NDP_HANDLE) then begin
    fInstanceCommands.vkDestroySurfaceKHR(fInstance, fHandle, fAllocCallbacks);
    fHandle := VK_INVALID_NDP_HANDLE;
  end;
  if Assigned(fAllocCallbacks) then begin
    Dispose(fAllocCallbacks);
    fAllocCallbacks := nil;
  end;
  if OwnsHandle and (fHandle <> VK_INVALID_NDP_HANDLE) then
    fInstanceCommands.vkDestroySurfaceKHR(fInstanceCommands.Instance, fHandle, AllocCallbacks);
  fHandle := VK_INVALID_NDP_HANDLE;
  inherited Destroy;
 end;
--- a/projects/utils/uvkuSurfaceFactory.pas
+++ b/projects/utils/uvkuSurfaceFactory.pas
@@ -34,20 +34,19 @@ type
  private
    fFlags: VkFlags;
    fWinControl: TWinControl;
    fInstance: VkInstance;
    fInstanceCommands: TVkInstanceCommands;
    procedure SetWinControl(aValue: TWinControl);
  public
    property WinControl: TWinControl read fWinControl write SetWinControl;
    property Flags:      VkFlags     read fFlags      write fFlags;
    function CreateSurface: TvkuSurface;
    function CreateSurface: TvkuSurfaceEx;
    function CreateSurface(
      const aAllocHandler: TvkuAllocationHandler;
      const aOwnsHandler: Boolean): TvkuSurface;
      const aOwnsHandler: Boolean): TvkuSurfaceEx;
    constructor Create(const aInstance: TvkuInstance);
    constructor Create(const aInstance: VkInstance; const aInstanceCommands: TVkInstanceCommands);
    constructor Create(const aInstanceCommands: TVkInstanceCommands);
  end;
 implementation
@@ -154,13 +153,13 @@ begin
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 function TvkuSurfaceFactory.CreateSurface: TvkuSurface;
 function TvkuSurfaceFactory.CreateSurface: TvkuSurfaceEx;
 begin
  result := CreateSurface(nil, false);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 function TvkuSurfaceFactory.CreateSurface(const aAllocHandler: TvkuAllocationHandler; const aOwnsHandler: Boolean): TvkuSurface;
 function TvkuSurfaceFactory.CreateSurface(const aAllocHandler: TvkuAllocationHandler; const aOwnsHandler: Boolean): TvkuSurfaceEx;
 {$IF DEFINED(VK_USE_PLATFORM_XLIB_KHR)}
  {$ERROR 'TODO: implement'}
 {$ELSEIF DEFINED(VK_USE_PLATFORM_XCB_KHR)}
@@ -195,8 +194,8 @@ begin
    CreateInfo.hwnd      := fHwnd;
  {$ENDIF}
  if Assigned(aAllocHandler)
    then srf := TvkuSurfaceEx.Create(fInstance, CreateInfo, fInstanceCommands, aAllocHandler.GetAllocationCallbacks)
    else srf := TvkuSurfaceEx.Create(fInstance, CreateInfo, fInstanceCommands);
    then srf := TvkuSurfaceEx.Create(CreateInfo, fInstanceCommands, aAllocHandler.GetAllocationCallbacksPtr)
    else srf := TvkuSurfaceEx.Create(CreateInfo, fInstanceCommands);
  try
    srf.fAllocHandler := aAllocHandler;
    srf.fOwnsHandler  := aOwnsHandler;
@@ -209,11 +208,11 @@ end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 constructor TvkuSurfaceFactory.Create(const aInstance: TvkuInstance);
 begin
  Create(aInstance.Handle, aInstance.InstanceCommands);
  Create(aInstance.InstanceCommands);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 constructor TvkuSurfaceFactory.Create(const aInstance: VkInstance; const aInstanceCommands: TVkInstanceCommands);
 constructor TvkuSurfaceFactory.Create(const aInstanceCommands: TVkInstanceCommands);
 begin
  inherited Create;
  {$IF DEFINED(VK_USE_PLATFORM_XLIB_KHR)}
@@ -229,7 +228,6 @@ begin
  {$ELSEIF DEFINED(VK_USE_PLATFORM_WIN32_KHR)}
    fHInstance := Vulkan.HINSTANCE(GetModuleHandle(nil));
  {$ENDIF}
  fInstance         := aInstance;
  fInstanceCommands := aInstanceCommands;
  fFlags            := 0;
 end;
--- a/projects/utils/uvkuSwapChain.pas
+++ b/projects/utils/uvkuSwapChain.pas
@@ -6,38 +6,32 @@ interface
 uses
  Classes, SysUtils,
  Vulkan;
  Vulkan, uvkuBase, uvkuTypes;
 type
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  TvkuImageArr = array of VkImage;
  TvkuSwapChain = class(TObject)
  TvkuSwapChain = class(TvkuAllocHandle)
  private
    fHandle: VkSwapchainKHR;
    fDevice: VkDevice;
    fAllocCallbacks: PVkAllocationCallbacks;
    fDeviceCommands: TVkDeviceCommands;
    procedure CreateHandle(
      const aCreateInfo: PVkSwapchainCreateInfoKHR;
      const aAllocCallbacks: PVkAllocationCallbacks);
    procedure CreateHandle(const aCreateInfo: PVkSwapchainCreateInfoKHR);
  public
    property Handle:          VkSwapchainKHR    read fHandle;
    property Device:          VkDevice          read fDevice;
    property DeviceCommands:  TVkDeviceCommands read fDeviceCommands;
    function GetImages: TvkuImageArr;
    function AcquireNextImage(const aTimeout: VkUint64; const aSemaphore: VkSemaphore; const aFence: VkFence): VkUint32;
    constructor Create(
      const aDevice: VkDevice;
      const aCreateInfo: TVkSwapchainCreateInfoKHR;
      const aDeviceCommands: TVkDeviceCommands);
      const aDeviceCommands: TVkDeviceCommands;
      const aAllocCallbacks: PVkAllocationCallbacks = nil); overload;
    constructor Create(
      const aDevice: VkDevice;
      const aCreateInfo: TVkSwapchainCreateInfoKHR;
      const aHandle: VkSwapchainKHR;
      const aOwnsHandle: Boolean;
      const aDeviceCommands: TVkDeviceCommands;
      const aAllocCallbacks: TVkAllocationCallbacks);
      const aAllocCallbacks: PVkAllocationCallbacks = nil); overload;
    destructor Destroy; override;
  end;
@@ -49,18 +43,14 @@ uses
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 //TvkuSwapChain//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 procedure TvkuSwapChain.CreateHandle(const aCreateInfo: PVkSwapchainCreateInfoKHR; const aAllocCallbacks: PVkAllocationCallbacks);
 procedure TvkuSwapChain.CreateHandle(const aCreateInfo: PVkSwapchainCreateInfoKHR);
 var err: TVkResult;
 begin
  if Assigned(aAllocCallbacks) then begin
    new(fAllocCallbacks);
    fAllocCallbacks^ := aAllocCallbacks^;
  end;
  if not Assigned(fDeviceCommands.vkCreateSwapchainKHR) then
    raise TvkuException.Create('invalid function pointer: vkCreateSwapchainKHR; did you enabled the VK_KHR_swapchain extension?');
  err := fDeviceCommands.vkCreateSwapchainKHR(fDevice, aCreateInfo, fAllocCallbacks, @fHandle);
  err := fDeviceCommands.vkCreateSwapchainKHR(fDeviceCommands.Device, aCreateInfo, AllocCallbacks, @fHandle);
  if (err < VK_SUCCESS) then
    raise TvkuErrorException.Create('unable to create surface', err);
    raise TvkuErrorException.Create('unable to create swap chain', err);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
@@ -70,12 +60,12 @@ var
  err: TVkResult;
 begin
  if not Assigned(fDeviceCommands.vkGetSwapchainImagesKHR) then
    raise TvkuException.Create('invalid function pointer: vkGetSwapchainImagesKHR; did you enabled the VK_KHR_swapchain extension?');
  err := fDeviceCommands.vkGetSwapchainImagesKHR(fDevice, fHandle, @c, nil);
    raise TvkuInvalidFuncPtrException.Create('vkGetSwapchainImagesKHR', 'VK_KHR_swapchain');
  err := fDeviceCommands.vkGetSwapchainImagesKHR(fDeviceCommands.Device, fHandle, @c, nil);
  if (err < VK_SUCCESS) then
    raise TvkuErrorException.Create('unable to get swap chain image count', err);
  SetLength(result, c);
  err := fDeviceCommands.vkGetSwapchainImagesKHR(fDevice, fHandle, @c, @result[0]);
  err := fDeviceCommands.vkGetSwapchainImagesKHR(fDeviceCommands.Device, fHandle, @c, @result[0]);
  if (err < VK_SUCCESS) then
    raise TvkuErrorException.Create('unable to get swap chain images', err);
 end;
@@ -83,46 +73,42 @@ end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 function TvkuSwapChain.AcquireNextImage(const aTimeout: VkUint64; const aSemaphore: VkSemaphore; const aFence: VkFence): VkUint32;
 var
  c: VkUint32;
  err: TVkResult;
 begin
  if not Assigned(fDeviceCommands.vkAcquireNextImageKHR) then
    raise TvkuException.Create('invalid function pointer: vkAcquireNextImageKHR; did you enabled the VK_KHR_swapchain extension?');
  err := fDeviceCommands.vkAcquireNextImageKHR(fDevice, fHandle, aTimeout, aSemaphore, aFence, @result);
    raise TvkuInvalidFuncPtrException.Create('vkAcquireNextImageKHR', 'VK_KHR_swapchain');
  err := fDeviceCommands.vkAcquireNextImageKHR(fDeviceCommands.Device, fHandle, aTimeout, aSemaphore, aFence, @result);
  if (err < VK_SUCCESS) then
    raise TvkuErrorException.Create('unable to aquire next image', err);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 constructor TvkuSwapChain.Create(const aDevice: VkDevice; const aCreateInfo: TVkSwapchainCreateInfoKHR; const aDeviceCommands: TVkDeviceCommands);
 constructor TvkuSwapChain.Create(const aCreateInfo: TVkSwapchainCreateInfoKHR; const aDeviceCommands: TVkDeviceCommands;
  const aAllocCallbacks: PVkAllocationCallbacks);
 begin
  inherited Create;
  fDevice         := aDevice;
  fDeviceCommands := aDeviceCommands;
  CreateHandle(@aCreateInfo, nil);
  SetAllocCallbacks(aAllocCallbacks);
  CreateHandle(@aCreateInfo);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 constructor TvkuSwapChain.Create(const aDevice: VkDevice; const aCreateInfo: TVkSwapchainCreateInfoKHR;
  const aDeviceCommands: TVkDeviceCommands; const aAllocCallbacks: TVkAllocationCallbacks);
 constructor TvkuSwapChain.Create(const aHandle: VkSwapchainKHR; const aOwnsHandle: Boolean;
  const aDeviceCommands: TVkDeviceCommands; const aAllocCallbacks: PVkAllocationCallbacks);
 begin
  inherited Create;
  fDevice         := aDevice;
  fHandle         := aHandle;
  fDeviceCommands := aDeviceCommands;
  CreateHandle(@aCreateInfo, @aAllocCallbacks);
  OwnsHandle      := aOwnsHandle;
  SetAllocCallbacks(aAllocCallbacks);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 destructor TvkuSwapChain.Destroy;
 begin
  if (fHandle <> VK_INVALID_NDP_HANDLE) then begin
    fDeviceCommands.vkDestroySwapchainKHR(fDevice, fHandle, fAllocCallbacks);
    fHandle := VK_INVALID_NDP_HANDLE;
  end;
  if Assigned(fAllocCallbacks) then begin
    Dispose(fAllocCallbacks);
    fAllocCallbacks := nil;
  end;
  if OwnsHandle and (fHandle <> VK_INVALID_NDP_HANDLE) then
    fDeviceCommands.vkDestroySwapchainKHR(fDeviceCommands.Device, fHandle, AllocCallbacks);
  fHandle := VK_INVALID_NDP_HANDLE;
  inherited Destroy;
 end;
--- a/projects/utils/uvkuSwapChainFactory.pas
+++ b/projects/utils/uvkuSwapChainFactory.pas
@@ -6,7 +6,7 @@ interface
 uses
  Classes, SysUtils,
  Vulkan, uvkuSwapChain, uvkuAllocationHandler, uvkuDevice;
  Vulkan, uvkuSwapChain, uvkuTypes, uvkuAllocationHandler, uvkuDevice;
 type
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
@@ -19,10 +19,8 @@ type
  end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  TvkuUint32Arr = array of VkUint32;
  TvkuSwapChainFactory = class(TObject)
  private
    fDevice: VkDevice;
    fDeviceCommands: TVkDeviceCommands;
    fFlags: VkSwapchainCreateFlagsKHR;
@@ -45,7 +43,6 @@ type
    function GetQueueFamilyIndex(const aIndex: Integer): VkUint32;
    procedure SetQueueFamilyIndex(const aIndex: Integer; aValue: VkUint32);
  public
    property Device:            VkDevice                        read fDevice;
    property DeviceCommands:    TVkDeviceCommands               read fDeviceCommands;
    property Flags:             VkSwapchainCreateFlagsKHR       read fFlags             write fFlags;
@@ -73,7 +70,7 @@ type
      const aOwnsHandler: Boolean): TvkuSwapChain;
    constructor Create(const aDevice: TvkuDevice);
    constructor Create(const aDevice: VkDevice; const aDeviceCommands: TVkDeviceCommands);
    constructor Create(const aDeviceCommands: TVkDeviceCommands);
  end;
 implementation
@@ -149,27 +146,27 @@ begin
    else CreateInfo.clipped := VK_FALSE;
  if Assigned(aAllocHandler)
    then result := TvkuSwapChainEx.Create(fDevice, CreateInfo, fDeviceCommands, aAllocHandler.GetAllocationCallbacks)
    else result := TvkuSwapChainEx.Create(fDevice, CreateInfo, fDeviceCommands);
    then result := TvkuSwapChainEx.Create(CreateInfo, fDeviceCommands, aAllocHandler.GetAllocationCallbacksPtr)
    else result := TvkuSwapChainEx.Create(CreateInfo, fDeviceCommands);
  try
    TvkuSwapChainEx(result).fAllocHandler := aAllocHandler;
    TvkuSwapChainEx(result).fOwnsHandler  := aOwnsHandler;
  except
    FreeAndNil(result);
    raise;
  end;
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 constructor TvkuSwapChainFactory.Create(const aDevice: TvkuDevice);
 begin
  Create(aDevice.Handle, aDevice.DeviceCommands);
  Create(aDevice.DeviceCommands);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 constructor TvkuSwapChainFactory.Create(const aDevice: VkDevice; const aDeviceCommands: TVkDeviceCommands);
 constructor TvkuSwapChainFactory.Create(const aDeviceCommands: TVkDeviceCommands);
 begin
  inherited Create;
  fDevice         := aDevice;
  fDeviceCommands := aDeviceCommands;
  fPresentMode    := VK_PRESENT_MODE_FIFO_KHR;
 end;
--- a/projects/utils/uvkuTypes.pas
+++ b/projects/utils/uvkuTypes.pas
@@ -0,0 +1,45 @@
 unit uvkuTypes;
 {$mode objfpc}{$H+}
 interface
 uses
  Classes, SysUtils,
  Vulkan;
 type
  TvkuFloatArr                        = array of VkFloat;
  TvkuUint32Arr                       = array of VkUint32;
  TvkuImageArr                        = array of VkImage;
  TvkuPhysicalDeviceArr               = array of VkPhysicalDevice;
  TvkuQueueFamilyPropertiesArr        = array of TVkQueueFamilyProperties;
  TvkuSparseImageFormatPropertiesArr  = array of TVkSparseImageFormatProperties;
  TvkuSurfaceFormatArr                = array of TVkSurfaceFormatKHR;
  TvkuPresentModeArr                  = array of TVkPresentModeKHR;
  TvkuDisplayPropertiesArr            = array of TVkDisplayPropertiesKHR;
  TvkuDisplayPlanePropertiesArr       = array of TVkDisplayPlanePropertiesKHR;
  TvkuDisplayArr                      = array of VkDisplayKHR;
  TvkuDisplayModePropertiesArr        = array of TVkDisplayModePropertiesKHR;
  TvkuCommandBufferArr                = array of VkCommandBuffer;
  TvkuApplicationInfo = packed record
    AppName:        String;
    AppVersion:     VkVersion;
    EngineName:     String;
    EngineVersion:  VkVersion;
    ApiVersion:     VkVersion;
  end;
  TvkuQueueCreateInfo = packed record
    Flags:        VkDeviceQueueCreateFlags;
    FamilyIndex:  VkUint32;
    Priorities:   TvkuFloatArr;
  end;
  TvkuQueueCreateInfoArr = array of TvkuQueueCreateInfo;
 implementation
 end.
--- a/projects/utils/uvkuUtils.pas
+++ b/projects/utils/uvkuUtils.pas
@@ -11,6 +11,7 @@ uses
 type
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  TvkuException = class(Exception);
  TvkuErrorException = class(TvkuException)
  private
    fError: TVkResult;
@@ -19,6 +20,18 @@ type
    constructor Create(const msg: string; const aError: TVkResult);
  end;
  TvkuInvalidFuncPtrException = class(TvkuException)
  private
    fExtensionName: String;
    fFunctionName: String;
    fExtentionName: String;
  public
    property FunctionName: String read fFunctionName;
    property ExtensionName: String read fExtensionName;
    constructor Create(const aFunctionName: String; const aExtensionName: String = '');
  end;
 function vkuMakeString(const aFeatures: TVkPhysicalDeviceFeatures; const aSeperator: String = sLineBreak): String;
 function vkuMakeString(const aProperties: TVkPhysicalDeviceProperties; const aPrintLimits, aPrintSparseProps: Boolean): String;
 function vkuMakeString(const aMemoryProperties: TVkPhysicalDeviceMemoryProperties): String;
@@ -34,6 +47,20 @@ begin
  fError := aError;
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 //TvkuInvalidFuncPtrException////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 constructor TvkuInvalidFuncPtrException.Create(const aFunctionName: String; const aExtensionName: String);
 var s: String;
 begin
  fFunctionName  := aFunctionName;
  fExtensionName := aExtensionName;
  s := 'did you load the vulkan core commands?';
  if (aExtensionName <> '') then
    s := 'did you enabled/load the ' + fExtensionName + ' extension?';
  inherited Create('invalid function pointer: ' + fFunctionName + '; ' + s);
 end;
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////