Add GPUVertexLayout to graphics backends

Source/Engine/Graphics/Shaders/GPUVertexLayout.h

@@ -0,0 +1,44 @@
+// Copyright (c) 2012-2024 Wojciech Figat. All rights reserved.
+
+#pragma once
+
+#include "VertexElement.h"
+#include "Engine/Graphics/GPUResource.h"
+#include "Engine/Core/Collections/Array.h"
+
+/// <summary>
+/// Defines input layout of vertex buffer data passed to the Vertex Shader.
+/// </summary>
+API_CLASS(Sealed, NoSpawn) class FLAXENGINE_API GPUVertexLayout : public GPUResource
+{
+    DECLARE_SCRIPTING_TYPE_NO_SPAWN(GPUVertexLayout);
+    typedef Array<VertexElement, FixedAllocation<GPU_MAX_VS_ELEMENTS>> Elements;
+
+protected:
+    Elements _elements;
+
+    GPUVertexLayout();
+
+public:
+    /// <summary>
+    /// Gets the list of elements used by this layout.
+    /// </summary>
+    API_PROPERTY() FORCE_INLINE const Array<VertexElement, FixedAllocation<GPU_MAX_VS_ELEMENTS>>& GetElements() const
+    {
+        return _elements;
+    }
+
+    /// <summary>
+    /// Gets the vertex layout for a given list of elements. Uses internal cache to skip creating layout if it's already exists for a given list.
+    /// </summary>
+    /// <param name="elements">The list of elements for the layout.</param>
+    /// <returns>Vertex layout object. Doesn't need to be cleared as it's cached for an application lifetime.</returns>
+    API_FUNCTION() static GPUVertexLayout* Get(const Array<VertexElement, FixedAllocation<GPU_MAX_VS_ELEMENTS>>& elements);
+
+public:
+    // [GPUResource]
+    GPUResourceType GetResourceType() const override
+    {
+        return GPUResourceType::Descriptor;
+    }
+};