diff --git a/aster/include/aster/core/buffer.h b/aster/include/aster/core/buffer.h
index 0e8dbde..ebaeda0 100644
--- a/aster/include/aster/core/buffer.h
+++ b/aster/include/aster/core/buffer.h
@@ -10,13 +10,28 @@
 struct Device;
 
 /// A Vulkan buffer wrapper.
-struct Buffer final
+struct Buffer
 {
+    enum class FlagBits : u8
+    {
+        eNone = 0x0,
+        eStaging = 0x1,
+        eUniform = 0x2,
+        eStorage = 0x4,
+        eIndex = 0x8,
+        eVertex = 0x10,
+        eIndirect = 0x20,
+    };
+
+    using Flags = vk::Flags<FlagBits>;
+    constexpr static Flags FLAGS = {};
+
     const Device *m_Device = nullptr;
     vk::Buffer m_Buffer = nullptr;
     VmaAllocation m_Allocation = nullptr;
     u8 *m_Mapped = nullptr; ///< If the buffer is host visible, it should be (and stay) mapped.
     usize m_Size = 0;
+    Flags m_Flags = {};
 
     /// @returns True if it is a valid vulkan buffer.
     [[nodiscard]] bool
@@ -53,3 +68,50 @@ struct Buffer final
 
     DISALLOW_COPY_AND_ASSIGN(Buffer);
 };
+
+struct UniformBuffer : Buffer
+{
+    constexpr static Flags FLAGS = FlagBits::eUniform;
+};
+
+struct StorageBuffer : Buffer
+{
+    constexpr static Flags FLAGS = FlagBits::eStorage;
+};
+
+struct IndirectBuffer : Buffer
+{
+    constexpr static Flags FLAGS = FlagBits::eIndirect;
+};
+
+struct VertexBuffer : Buffer
+{
+    constexpr static Flags FLAGS = FlagBits::eVertex;
+};
+
+struct IndexBuffer : Buffer
+{
+    constexpr static Flags FLAGS = FlagBits::eIndex;
+};
+
+struct StagingBuffer : Buffer
+{
+    constexpr static Flags FLAGS = FlagBits::eStaging;
+};
+
+namespace concepts
+{
+template <typename T>
+concept AnyBuffer = std::derived_from<T, Buffer>;
+
+template <typename T, typename TInto>
+concept BufferInto = std::derived_from<T, Buffer> and std::derived_from<TInto, Buffer> and
+                     (Cast<bool>(T::FLAGS & TInto::FLAGS) or std::same_as<Buffer, TInto>);
+
+template <typename T>
+concept AnyBufferRef = Deref<T> and AnyBuffer<DerefType<T>>;
+
+template <typename T, typename TTo>
+concept BufferRefTo = Deref<T> and BufferInto<DerefType<T>, TTo>;
+
+} // namespace concepts
\ No newline at end of file
diff --git a/aster/include/aster/core/image.h b/aster/include/aster/core/image.h
index 7f34e9b..66bfa37 100644
--- a/aster/include/aster/core/image.h
+++ b/aster/include/aster/core/image.h
@@ -36,38 +36,26 @@ ToOffset3D(const vk::Extent3D &extent)
 
 struct Image
 {
+    enum class FlagBits : u8
+    {
+        eSampled = 0x1,
+        eStorage = 0x2,
+        eCube = 0x4,
+    };
+
+    using Flags = vk::Flags<FlagBits>;
+    constexpr static Flags FLAGS = {};
+
     const Device *m_Device = nullptr;
     vk::Image m_Image = nullptr;
     VmaAllocation m_Allocation = nullptr;
     vk::Extent3D m_Extent;
     vk::Format m_Format;
     u8 m_EmptyPadding_ = 0;
-    u8 m_Flags_ = 0;
+    Flags m_Flags_ = {};
     u8 m_LayerCount = 0;
     u8 m_MipLevels = 0;
 
-    constexpr static u8 SAMPLED_BIT = 1 << 7;
-    constexpr static u8 STORAGE_BIT = 1 << 6;
-    constexpr static u8 CUBE_BIT = 1 << 5;
-
-    [[nodiscard]] bool
-    IsSampled() const
-    {
-        return m_Flags_ & SAMPLED_BIT;
-    }
-
-    [[nodiscard]] bool
-    IsStorage() const
-    {
-        return m_Flags_ & STORAGE_BIT;
-    }
-
-    [[nodiscard]] bool
-    IsCube() const
-    {
-        return m_Flags_ & CUBE_BIT;
-    }
-
     [[nodiscard]] bool
     IsValid() const
     {
@@ -80,18 +68,12 @@ struct Image
         return m_MipLevels;
     }
 
-    static bool
-    Conforms(const Image &)
-    {
-        return true;
-    }
-
     void DestroyView(vk::ImageView imageView) const;
 
     // Constructors.
 
     explicit Image(const Device *device, vk::Image image, VmaAllocation allocation, vk::Extent3D extent,
-          vk::Format format, u8 flags, u8 layerCount, u8 mipLevels);
+                   vk::Format format, Flags flags, u8 layerCount, u8 mipLevels);
 
     Image(Image &&other) noexcept;
     Image &operator=(Image &&other) noexcept;
@@ -101,106 +83,50 @@ struct Image
     DISALLOW_COPY_AND_ASSIGN(Image);
 };
 
-namespace concepts
-{
-template <typename T>
-concept Image = std::derived_from<T, Image>;
-
-template <typename T>
-concept ImageRef = Derefencable<T> and Image<DereferencesTo<T>>;
-
-template <typename T>
-concept SampledImage = requires() {
-    { T::SAMPLED } -> std::convertible_to<bool>;
-} and T::SAMPLED and Image<T>;
-
-template <typename T>
-concept SampledImageRef = Derefencable<T> and SampledImage<DereferencesTo<T>>;
-
-template <typename T>
-concept ImageCube = requires() {
-    { T::CUBE } -> std::convertible_to<bool>;
-} and T::CUBE and Image<T>;
-
-template <typename T>
-concept ImageCubeRef = Derefencable<T> and ImageCube<DereferencesTo<T>>;
-
-template <typename T>
-concept StorageImage = requires() {
-    { T::STORAGE } -> std::convertible_to<bool>;
-} and T::STORAGE and Image<T>;
-
-template <typename T>
-concept StorageImageRef = Derefencable<T> and StorageImage<DereferencesTo<T>>;
-
-} // namespace concepts
-
 struct Texture : Image
 {
-    constexpr static bool SAMPLED = true;
-
-    static bool
-    Conforms(const Image &other)
-    {
-        return other.IsSampled();
-    }
+    constexpr static Flags FLAGS = FlagBits::eSampled;
 };
 
 struct ImageCube : Image
 {
-    constexpr static bool CUBE = true;
-
-    static bool
-    Conforms(const Image &other)
-    {
-        return other.IsCube();
-    }
+    constexpr static Flags FLAGS = FlagBits::eCube;
 };
 
 struct TextureCube : Image
 {
-    constexpr static bool SAMPLED = true;
-    constexpr static bool CUBE = true;
-
-    static bool
-    Conforms(const Image &other)
-    {
-        return other.IsSampled() && other.IsCube();
-    }
+    constexpr static Flags FLAGS = Texture::FLAGS | ImageCube::FLAGS;
 };
 
 struct StorageImage : Image
 {
-    constexpr static bool STORAGE = true;
-
-    static bool
-    Conforms(const Image &other)
-    {
-        return other.IsStorage();
-    }
+    constexpr static Flags FLAGS = FlagBits::eStorage;
 };
 
 struct StorageTexture : StorageImage
 {
-    constexpr static bool SAMPLED = true;
-    constexpr static bool STORAGE = true;
-
-    static bool
-    Conforms(const Image &other)
-    {
-        return other.IsStorage() && other.IsSampled();
-    }
+    constexpr static Flags FLAGS = StorageImage::FLAGS | Texture::FLAGS;
 };
 
 struct StorageTextureCube : StorageImage
 {
-    constexpr static bool SAMPLED = true;
-    constexpr static bool CUBE = true;
-    constexpr static bool STORAGE = true;
+    constexpr static Flags FLAGS = StorageImage::FLAGS | Texture::FLAGS | ImageCube::FLAGS;
+};
 
-    static bool
-    Conforms(const Image &other)
-    {
-        return other.IsStorage() && other.IsSampled() && other.IsCube();
-    }
-};
\ No newline at end of file
+namespace concepts
+{
+
+template <typename T>
+concept AnyImage = std::derived_from<T, Image>;
+
+template <typename T, typename TInto>
+concept ImageInto = std::derived_from<T, Image> and std::derived_from<TInto, Image> and
+                    (Cast<bool>(T::FLAGS & TInto::FLAGS) or std::same_as<Image, TInto>);
+
+template <typename T>
+concept AnyImageRef = Deref<T> and AnyImage<DerefType<T>>;
+
+template <typename T, typename TTo>
+concept ImageRefTo = Deref<T> and ImageInto<DerefType<T>, TTo>;
+
+} // namespace concepts
\ No newline at end of file
diff --git a/aster/include/aster/core/image_view.h b/aster/include/aster/core/image_view.h
index 247aeed..452a8fe 100644
--- a/aster/include/aster/core/image_view.h
+++ b/aster/include/aster/core/image_view.h
@@ -8,7 +8,7 @@
 #include "global.h"
 #include "image.h"
 
-template <concepts::Image TImage>
+template <concepts::AnyImage TImage>
 struct View
 {
     using ImageType = TImage;
@@ -93,31 +93,16 @@ using StorageTextureCubeView = View<StorageTextureCube>;
 
 namespace concepts
 {
-template <typename TView>
-concept View = std::derived_from<TView, View<typename TView::ImageType>>;
+template <typename T>
+concept View = std::derived_from<T, View<typename T::ImageType>>;
+
+template <typename T, typename TTo>
+concept ViewTo = View<T> and ImageInto<typename T::ImageType, TTo>;
 
 template <typename T>
-concept ViewRef = Derefencable<T> and View<DereferencesTo<T>>;
+concept ViewRef = Deref<T> and View<DerefType<T>>;
 
-template <typename T>
-concept ImageView = View<T> and Image<typename T::ImageType>;
-
-template <typename T>
-concept ImageViewRef = Derefencable<T> and ImageView<DereferencesTo<T>>;
-
-template <typename T>
-concept ImageCubeView = View<T> and ImageCube<typename T::ImageType>;
-
-template <typename T>
-concept SampledImageView = View<T> and SampledImage<typename T::ImageType>;
-
-template <typename T>
-concept SampledImageViewRef = Derefencable<T> and SampledImageView<DereferencesTo<T>>;
-
-template <typename T>
-concept StorageImageView = View<T> and StorageImage<typename T::ImageType>;
-
-template <typename T>
-concept StorageImageViewRef = Derefencable<T> and StorageImageView<DereferencesTo<T>>;
+template <typename T, typename TTo>
+concept ViewRefTo = ViewRef<T> and ImageInto<typename DerefType<T>::ImageType, TTo>;
 
 } // namespace concepts
\ No newline at end of file
diff --git a/aster/include/aster/core/type_traits.h b/aster/include/aster/core/type_traits.h
index 9ba8b88..9298a10 100644
--- a/aster/include/aster/core/type_traits.h
+++ b/aster/include/aster/core/type_traits.h
@@ -13,11 +13,16 @@ struct Image;
 namespace concepts
 {
 template <typename T>
-concept Derefencable = requires(T a) {
+concept Deref = requires(T a) {
     { *a };
 };
 
-template <Derefencable T>
-using DereferencesTo = std::remove_cvref_t<decltype(*std::declval<T>())>;
+template <typename TRef, typename TVal>
+concept DerefTo = requires(TRef a) {
+    { *a } -> std::convertible_to<TVal>;
+};
+
+template <Deref T>
+using DerefType = std::remove_cvref_t<decltype(*std::declval<T>())>;
 
 } // namespace concepts
\ No newline at end of file
diff --git a/aster/include/aster/systems/buffer_manager.h b/aster/include/aster/systems/buffer_manager.h
index 344a40f..f30c444 100644
--- a/aster/include/aster/systems/buffer_manager.h
+++ b/aster/include/aster/systems/buffer_manager.h
@@ -10,17 +10,25 @@
 
 namespace systems
 {
+
+template <std::derived_from<Buffer> TTo, std::derived_from<Buffer> TFrom>
+static Ref<TTo>
+CastBuffer(const Ref<TFrom> &from)
+{
+    if constexpr (not concepts::BufferInto<TFrom, TTo>)
+        assert(TTo::FLAGS & from->m_Flags);
+    return std::reinterpret_pointer_cast<TTo>(from);
+}
+
 class BufferManager final
 {
-    using Handle = Ref<Buffer>;
-
     const Device *m_Device = nullptr;
 
   public:
     explicit BufferManager(const Device *device);
 
-    [[nodiscard]] Handle CreateStorageBuffer(usize size, cstr name = nullptr);
-    [[nodiscard]] Handle CreateUniformBuffer(usize size, cstr name = nullptr);
-    [[nodiscard]] Handle CreateStagingBuffer(usize size, cstr name = nullptr);
+    [[nodiscard]] Ref<StorageBuffer> CreateStorageBuffer(usize size, cstr name = nullptr) const;
+    [[nodiscard]] Ref<UniformBuffer> CreateUniformBuffer(usize size, cstr name = nullptr) const;
+    [[nodiscard]] Ref<StagingBuffer> CreateStagingBuffer(usize size, cstr name = nullptr) const;
 };
 } // namespace systems
\ No newline at end of file
diff --git a/aster/include/aster/systems/commit_manager.h b/aster/include/aster/systems/commit_manager.h
index 8d6a2de..c791b66 100644
--- a/aster/include/aster/systems/commit_manager.h
+++ b/aster/include/aster/systems/commit_manager.h
@@ -224,7 +224,7 @@ class CommitManager
 
     // Commit Storage Images
     ResId<StorageImageView>
-    CommitStorageImage(const concepts::StorageImageViewRef auto &image)
+    CommitStorageImage(const concepts::ViewRefTo<StorageImage> auto &image)
     {
         return CommitStorageImage(CastView<StorageImageView>(image));
     }
@@ -233,19 +233,17 @@ class CommitManager
 
     // Sampled Images
     ResId<TextureView>
-    CommitTexture(const concepts::SampledImageViewRef auto &image, const Ref<Sampler> &sampler)
+    CommitTexture(const concepts::ViewRefTo<Texture> auto &image, const Ref<Sampler> &sampler)
     {
         return CommitTexture(CastView<TextureView>(image), sampler);
     }
 
     ResId<TextureView>
-    CommitTexture(const concepts::SampledImageViewRef auto &image)
+    CommitTexture(const concepts::ViewRefTo<Texture> auto &image)
     {
         return CommitTexture(CastView<TextureView>(image));
     }
 
-    static_assert(concepts::SampledImageViewRef<Ref<TextureView>>);
-
     ResId<TextureView> CommitTexture(const Ref<TextureView> &handle);
     ResId<TextureView> CommitTexture(const Ref<TextureView> &image, const Ref<Sampler> &sampler);
 
diff --git a/aster/include/aster/systems/image_manager.h b/aster/include/aster/systems/image_manager.h
index 59f83b5..ddbb616 100644
--- a/aster/include/aster/systems/image_manager.h
+++ b/aster/include/aster/systems/image_manager.h
@@ -11,11 +11,12 @@
 namespace systems
 {
 
-template <std::derived_from<Image> TTo>
+template <std::derived_from<Image> TTo, std::derived_from<Image> TFrom>
 static Ref<TTo>
-CastImage(const concepts::ImageRef auto &from)
+CastImage(const Ref<TFrom> &from)
 {
-    assert(TTo::Conforms(*from.get()));
+    if constexpr (not concepts::ImageInto<TFrom, TTo>)
+        assert(TTo::FLAGS & from->m_Flags_);
     return std::reinterpret_pointer_cast<TTo>(from);
 }
 
@@ -55,10 +56,11 @@ struct DepthStencilImageCreateInfo
 class ImageManager final
 {
     const Device *m_Device;
+
   public:
     explicit ImageManager(const Device *device);
 
-    template <concepts::Image T>
+    template <concepts::ImageInto<Texture> T>
     [[nodiscard]] Ref<T>
     CreateTexture2D(const Texture2DCreateInfo &createInfo)
     {
@@ -66,7 +68,7 @@ class ImageManager final
         return CastImage<T>(handle);
     }
 
-    template <concepts::Image T>
+    template <concepts::ImageInto<TextureCube> T>
     [[nodiscard]] Ref<T>
     CreateTextureCube(const TextureCubeCreateInfo &createInfo)
     {
diff --git a/aster/include/aster/systems/resource_manager.h b/aster/include/aster/systems/resource_manager.h
index 08dbecf..1bdda7c 100644
--- a/aster/include/aster/systems/resource_manager.h
+++ b/aster/include/aster/systems/resource_manager.h
@@ -28,7 +28,7 @@ class ResourceManager
         {
         }
 
-        template <concepts::ImageView T>
+        template <concepts::ViewTo<Image> T>
         [[nodiscard]] Ref<T>
         CreateTexture2D(const Texture2DCreateInfo &createInfo)
         {
@@ -36,7 +36,7 @@ class ResourceManager
             return CastView<T>(handle);
         }
 
-        template <concepts::ImageCubeView T>
+        template <concepts::ViewTo<ImageCube> T>
         [[nodiscard]] Ref<T>
         CreateTextureCube(const TextureCubeCreateInfo &createInfo)
         {
diff --git a/aster/include/aster/systems/view_manager.h b/aster/include/aster/systems/view_manager.h
index be1ac2c..91a3ed2 100644
--- a/aster/include/aster/systems/view_manager.h
+++ b/aster/include/aster/systems/view_manager.h
@@ -13,15 +13,16 @@
 namespace systems
 {
 
-template <concepts::ImageView TTo>
+template <concepts::View TTo, std::derived_from<Image> TFrom>
 static Ref<TTo>
-CastView(const concepts::ImageViewRef auto &from)
+CastView(const Ref<View<TFrom>> &from)
 {
-    assert(TTo::ImageType::Conforms(*from->m_Image.get()));
+    if constexpr (not concepts::ImageInto<TFrom, typename TTo::ImageType>)
+        assert(TTo::ImageType::FLAGS & from->m_Image->m_Flags_);
     return std::reinterpret_pointer_cast<TTo>(from);
 }
 
-template <concepts::Image TImage>
+template <concepts::AnyImage TImage>
 struct ViewCreateInfo
 {
     using ImageType = TImage;
@@ -91,7 +92,7 @@ class ViewManager final
   public:
     explicit ViewManager(const Device *device);
 
-    template <concepts::ImageView TImageView>
+    template <concepts::View TImageView>
     Ref<TImageView>
     CreateView(const ViewCreateInfo<typename TImageView::ImageType> &createInfo)
     {
diff --git a/aster/src/aster/core/buffer.cpp b/aster/src/aster/core/buffer.cpp
index 945e868..ebfefbc 100644
--- a/aster/src/aster/core/buffer.cpp
+++ b/aster/src/aster/core/buffer.cpp
@@ -41,6 +41,19 @@ Buffer::Buffer(const Device *device, const usize size, const vk::BufferUsageFlag
     m_Size = size;
     m_Allocation = allocation;
     m_Mapped = Cast<u8 *>(allocationInfo.pMappedData);
+    m_Flags = {};
+    if (bufferUsage & vk::BufferUsageFlagBits::eTransferSrc)
+        m_Flags |= FlagBits::eStaging;
+    if (bufferUsage & vk::BufferUsageFlagBits::eIndexBuffer)
+        m_Flags |= FlagBits::eIndex;
+    if (bufferUsage & vk::BufferUsageFlagBits::eIndirectBuffer)
+        m_Flags |= FlagBits::eIndirect;
+    if (bufferUsage & vk::BufferUsageFlagBits::eVertexBuffer)
+        m_Flags |= FlagBits::eVertex;
+    if (bufferUsage & vk::BufferUsageFlagBits::eUniformBuffer)
+        m_Flags |= FlagBits::eUniform;
+    if (bufferUsage & vk::BufferUsageFlagBits::eStorageBuffer)
+        m_Flags |= FlagBits::eStorage;
 
     device->SetName(m_Buffer, name);
 }
diff --git a/aster/src/aster/core/image.cpp b/aster/src/aster/core/image.cpp
index bf77161..d78410f 100644
--- a/aster/src/aster/core/image.cpp
+++ b/aster/src/aster/core/image.cpp
@@ -31,7 +31,7 @@ Image::~Image()
         return;
 
     vmaDestroyImage(m_Device->m_Allocator, Take(m_Image), m_Allocation);
-    m_Flags_ = 0;
+    m_Flags_ = {};
 }
 
 void
@@ -463,7 +463,7 @@ Image::Image(Image &&other) noexcept
 }
 
 Image::Image(const Device *device, const vk::Image image, const VmaAllocation allocation, const vk::Extent3D extent,
-             const vk::Format format, const u8 flags, const u8 layerCount, const u8 mipLevels)
+             const vk::Format format, const Flags flags, const u8 layerCount, const u8 mipLevels)
     : m_Device{device}
     , m_Image{image}
     , m_Allocation{allocation}
diff --git a/aster/src/aster/systems/buffer_manager.cpp b/aster/src/aster/systems/buffer_manager.cpp
index 625850f..8747676 100644
--- a/aster/src/aster/systems/buffer_manager.cpp
+++ b/aster/src/aster/systems/buffer_manager.cpp
@@ -7,8 +7,8 @@
 
 using namespace systems;
 
-Ref<Buffer>
-BufferManager::CreateStorageBuffer(const usize size, const cstr name)
+Ref<StorageBuffer>
+BufferManager::CreateStorageBuffer(const usize size, const cstr name) const
 {
     // TODO: Storage and Index buffer are set.
     // This is hacky and should be improved.
@@ -19,30 +19,131 @@ BufferManager::CreateStorageBuffer(const usize size, const cstr name)
                                                      VMA_ALLOCATION_CREATE_HOST_ACCESS_ALLOW_TRANSFER_INSTEAD_BIT |
                                                      VMA_ALLOCATION_CREATE_MAPPED_BIT;
     constexpr VmaMemoryUsage memoryUsage = VMA_MEMORY_USAGE_AUTO;
-    return std::make_shared<Buffer>(m_Device, size, usage, createFlags, memoryUsage, name);
+    return std::make_shared<StorageBuffer>(Buffer{m_Device, size, usage, createFlags, memoryUsage, name});
 }
 
-Ref<Buffer>
-BufferManager::CreateUniformBuffer(const usize size, const cstr name)
+Ref<UniformBuffer>
+BufferManager::CreateUniformBuffer(const usize size, const cstr name) const
 {
     constexpr vk::BufferUsageFlags usage = vk::BufferUsageFlagBits::eUniformBuffer;
     constexpr VmaAllocationCreateFlags createFlags = VMA_ALLOCATION_CREATE_HOST_ACCESS_SEQUENTIAL_WRITE_BIT |
                                                      VMA_ALLOCATION_CREATE_HOST_ACCESS_ALLOW_TRANSFER_INSTEAD_BIT |
                                                      VMA_ALLOCATION_CREATE_MAPPED_BIT;
     constexpr VmaMemoryUsage memoryUsage = VMA_MEMORY_USAGE_AUTO;
-    return std::make_shared<Buffer>(m_Device, size, usage, createFlags, memoryUsage, name);
+    return std::make_shared<UniformBuffer>(Buffer{m_Device, size, usage, createFlags, memoryUsage, name});
 }
 
-Ref<Buffer>
-BufferManager::CreateStagingBuffer(const usize size, const cstr name)
+Ref<StagingBuffer>
+BufferManager::CreateStagingBuffer(const usize size, const cstr name) const
 {
     constexpr vk::BufferUsageFlags usage = vk::BufferUsageFlagBits::eTransferSrc;
     constexpr VmaAllocationCreateFlags createFlags =
         VMA_ALLOCATION_CREATE_HOST_ACCESS_SEQUENTIAL_WRITE_BIT | VMA_ALLOCATION_CREATE_MAPPED_BIT;
     constexpr VmaMemoryUsage memoryUsage = VMA_MEMORY_USAGE_AUTO;
-    return std::make_shared<Buffer>(m_Device, size, usage, createFlags, memoryUsage, name);
+    return std::make_shared<StagingBuffer>(Buffer{m_Device, size, usage, createFlags, memoryUsage, name});
 }
 
+//
+// void
+// UniformBuffer::Init(const Device *device, const usize size, const cstr name)
+//{
+//    Allocate(device, size, vk::BufferUsageFlagBits::eUniformBuffer,
+//             VMA_ALLOCATION_CREATE_HOST_ACCESS_SEQUENTIAL_WRITE_BIT |
+//                 VMA_ALLOCATION_CREATE_HOST_ACCESS_ALLOW_TRANSFER_INSTEAD_BIT | VMA_ALLOCATION_CREATE_MAPPED_BIT,
+//             VMA_MEMORY_USAGE_AUTO, name);
+//}
+//
+// void
+// StorageBuffer::Init(const Device *device, usize size, bool hostVisible, cstr name)
+//{
+//    Init(device, size, hostVisible, false, name);
+//}
+//
+// void
+// StorageBuffer::Init(const Device *device, usize size, bool hostVisible, bool deviceAddress, cstr name)
+//{
+//    vk::BufferUsageFlags usage = vk::BufferUsageFlagBits::eStorageBuffer;
+//    if (deviceAddress)
+//    {
+//        usage |= vk::BufferUsageFlagBits::eShaderDeviceAddress;
+//    }
+//    if (hostVisible)
+//    {
+//        Allocate(device, size, usage,
+//                 VMA_ALLOCATION_CREATE_HOST_ACCESS_SEQUENTIAL_WRITE_BIT |
+//                     VMA_ALLOCATION_CREATE_HOST_ACCESS_ALLOW_TRANSFER_INSTEAD_BIT | VMA_ALLOCATION_CREATE_MAPPED_BIT,
+//                 VMA_MEMORY_USAGE_AUTO, name);
+//    }
+//    else
+//    {
+//        usage |= vk::BufferUsageFlagBits::eTransferDst;
+//        Allocate(device, size, usage, 0, VMA_MEMORY_USAGE_AUTO, name);
+//    }
+//}
+//
+// void
+// StorageIndexBuffer::Init(const Device *device, usize size, bool hostVisible, bool deviceAddress, cstr name)
+//{
+//    vk::BufferUsageFlags usage = vk::BufferUsageFlagBits::eStorageBuffer | vk::BufferUsageFlagBits::eIndexBuffer;
+//    if (deviceAddress)
+//    {
+//        usage |= vk::BufferUsageFlagBits::eShaderDeviceAddress;
+//    }
+//    if (hostVisible)
+//    {
+//        Allocate(device, size, usage,
+//                 VMA_ALLOCATION_CREATE_HOST_ACCESS_SEQUENTIAL_WRITE_BIT |
+//                     VMA_ALLOCATION_CREATE_HOST_ACCESS_ALLOW_TRANSFER_INSTEAD_BIT | VMA_ALLOCATION_CREATE_MAPPED_BIT,
+//                 VMA_MEMORY_USAGE_AUTO, name);
+//    }
+//    else
+//    {
+//        usage |= vk::BufferUsageFlagBits::eTransferDst;
+//        Allocate(device, size, usage, 0, VMA_MEMORY_USAGE_AUTO, name);
+//    }
+//}
+//
+// void
+// IndirectBuffer::Init(const Device *device, usize size, bool hostVisible, cstr name)
+//{
+//    vk::BufferUsageFlags usage = vk::BufferUsageFlagBits::eStorageBuffer | vk::BufferUsageFlagBits::eIndirectBuffer |
+//                                 vk::BufferUsageFlagBits::eShaderDeviceAddress;
+//    if (hostVisible)
+//    {
+//        Allocate(device, size, usage,
+//                 VMA_ALLOCATION_CREATE_HOST_ACCESS_SEQUENTIAL_WRITE_BIT |
+//                     VMA_ALLOCATION_CREATE_HOST_ACCESS_ALLOW_TRANSFER_INSTEAD_BIT | VMA_ALLOCATION_CREATE_MAPPED_BIT,
+//                 VMA_MEMORY_USAGE_AUTO, name);
+//    }
+//    else
+//    {
+//        usage |= vk::BufferUsageFlagBits::eTransferDst;
+//        Allocate(device, size, usage, 0, VMA_MEMORY_USAGE_AUTO, name);
+//    }
+//}
+//
+// void
+// VertexBuffer::Init(const Device *device, usize size, cstr name)
+//{
+//    Allocate(device, size, vk::BufferUsageFlagBits::eVertexBuffer | vk::BufferUsageFlagBits::eTransferDst, 0,
+//             VMA_MEMORY_USAGE_AUTO, name);
+//}
+//
+// void
+// IndexBuffer::Init(const Device *device, usize size, cstr name)
+//{
+//    Allocate(device, size, vk::BufferUsageFlagBits::eIndexBuffer | vk::BufferUsageFlagBits::eTransferDst, 0,
+//             VMA_MEMORY_USAGE_AUTO, name);
+//}
+//
+// void
+// StagingBuffer::Init(const Device *device, usize size, cstr name)
+//{
+//    Allocate(device, size, vk::BufferUsageFlagBits::eTransferSrc,
+//             VMA_ALLOCATION_CREATE_HOST_ACCESS_SEQUENTIAL_WRITE_BIT | VMA_ALLOCATION_CREATE_MAPPED_BIT,
+//             VMA_MEMORY_USAGE_AUTO, name);
+//}
+
 BufferManager::BufferManager(const Device *device)
     : m_Device{device}
 {
diff --git a/aster/src/aster/systems/image_manager.cpp b/aster/src/aster/systems/image_manager.cpp
index 722944d..762d83d 100644
--- a/aster/src/aster/systems/image_manager.cpp
+++ b/aster/src/aster/systems/image_manager.cpp
@@ -49,11 +49,11 @@ ImageManager::CreateTexture2D(const Texture2DCreateInfo &createInfo)
 
     u8 layerCount = Cast<u8>(imageCreateInfo.arrayLayers);
     u8 mipLevels = Cast<u8>(imageCreateInfo.mipLevels);
-    u8 flags = 0;
+    Image::Flags flags = {};
     if (createInfo.m_IsSampled)
-        flags |= Image::SAMPLED_BIT;
+        flags |= Image::FlagBits::eSampled;
     if (createInfo.m_IsStorage)
-        flags |= Image::STORAGE_BIT;
+        flags |= Image::FlagBits::eStorage;
 
     m_Device->SetName(image, createInfo.m_Name);
 
@@ -80,11 +80,11 @@ ImageManager::CreateTextureCube(const TextureCubeCreateInfo &createInfo)
 
     u8 layerCount = Cast<u8>(imageCreateInfo.arrayLayers);
     u8 mipLevels = Cast<u8>(imageCreateInfo.mipLevels);
-    u8 flags = Image::CUBE_BIT;
+    Image::Flags flags = Image::FlagBits::eCube;
     if (createInfo.m_IsSampled)
-        flags |= Image::SAMPLED_BIT;
+        flags |= Image::FlagBits::eSampled;
     if (createInfo.m_IsStorage)
-        flags |= Image::STORAGE_BIT;
+        flags |= Image::FlagBits::eStorage;
 
     m_Device->SetName(image, createInfo.m_Name);
 
@@ -114,8 +114,8 @@ ImageManager::CreateAttachment(const AttachmentCreateInfo &createInfo)
 
     m_Device->SetName(image, createInfo.m_Name);
 
-    return std::make_shared<Image>(m_Device, image, allocation, imageCreateInfo.extent, imageCreateInfo.format, 0,
-                                   layerCount, mipLevels);
+    return std::make_shared<Image>(m_Device, image, allocation, imageCreateInfo.extent, imageCreateInfo.format,
+                                   Image::Flags{}, layerCount, mipLevels);
 }
 
 Ref<Image>
@@ -140,8 +140,8 @@ ImageManager::CreateDepthStencilImage(const DepthStencilImageCreateInfo &createI
 
     m_Device->SetName(image, createInfo.m_Name);
 
-    return std::make_shared<Image>(m_Device, image, allocation, imageCreateInfo.extent, imageCreateInfo.format, 0,
-                                   layerCount, mipLevels);
+    return std::make_shared<Image>(m_Device, image, allocation, imageCreateInfo.extent, imageCreateInfo.format,
+                                   Image::Flags{}, layerCount, mipLevels);
 }
 
 vk::ImageCreateInfo
diff --git a/samples/03_model_render/asset_loader.h b/samples/03_model_render/asset_loader.h
index b346147..7d7f6eb 100644
--- a/samples/03_model_render/asset_loader.h
+++ b/samples/03_model_render/asset_loader.h
@@ -139,7 +139,7 @@ GenerateMipMaps(vk::CommandBuffer commandBuffer, const Ref<Texture> &textureView
                 vk::ImageLayout finalLayout, vk::PipelineStageFlags2 prevStage, vk::PipelineStageFlags2 finalStage);
 
 void
-GenerateMipMaps(vk::CommandBuffer commandBuffer, concepts::SampledImageRef auto &texture, vk::ImageLayout initialLayout,
+GenerateMipMaps(vk::CommandBuffer commandBuffer, concepts::ImageRefTo<Texture> auto &texture, vk::ImageLayout initialLayout,
                 vk::ImageLayout finalLayout,
                 vk::PipelineStageFlags2 prevStage = vk::PipelineStageFlagBits2::eAllCommands,
                 vk::PipelineStageFlags2 finalStage = vk::PipelineStageFlagBits2::eAllCommands)
@@ -149,7 +149,7 @@ GenerateMipMaps(vk::CommandBuffer commandBuffer, concepts::SampledImageRef auto
 }
 
 void
-GenerateMipMaps(vk::CommandBuffer commandBuffer, concepts::SampledImageViewRef auto &texture,
+GenerateMipMaps(vk::CommandBuffer commandBuffer, concepts::ViewRefTo<Texture> auto &texture,
                 vk::ImageLayout initialLayout, vk::ImageLayout finalLayout,
                 vk::PipelineStageFlags2 prevStage = vk::PipelineStageFlagBits2::eAllCommands,
                 vk::PipelineStageFlags2 finalStage = vk::PipelineStageFlagBits2::eAllCommands)
@@ -157,5 +157,3 @@ GenerateMipMaps(vk::CommandBuffer commandBuffer, concepts::SampledImageViewRef a
     GenerateMipMaps(commandBuffer, systems::CastImage<Texture>(texture->m_Image), initialLayout, finalLayout, prevStage,
                     finalStage);
 }
-
-static_assert(concepts::SampledImageRef<Ref<Texture>>);
\ No newline at end of file