urho3d/Source/Urho3D/GraphicsAPI/Direct3D9/D3D9VertexDeclaration.h

// Copyright (c) 2008-2022 the Urho3D project
// License: MIT

#pragma once

#include "../../Container/Ptr.h"
#include "../../Container/Vector.h"
#include "../../GraphicsAPI/GraphicsDefs.h"

#include <d3d9.h>

namespace Urho3D
{

class Graphics;
class VertexBuffer;

/// One element in a vertex declaration. In contrast to the VertexElement structure, takes into account the stream source index.
struct VertexDeclarationElement_D3D9
{
    /// Element type.
    VertexElementType type_;
    /// Element semantic.
    VertexElementSemantic semantic_;
    /// Semantic index.
    unsigned char index_;
    /// Stream index.
    unsigned char streamIndex_;
    /// Byte offset.
    unsigned offset_;
};

/// Vertex declaration.
class URHO3D_API VertexDeclaration_D3D9 : public RefCounted
{
public:
    /// Construct with a single buffer's vertex element list.
    VertexDeclaration_D3D9(Graphics* graphics, const PODVector<VertexElement>& srcElements);
    /// Construct with vertex buffers to base declaration on. Higher index buffers will override semantics on lower indices.
    VertexDeclaration_D3D9(Graphics* graphics, const PODVector<VertexBuffer*>& buffers);
    /// Construct with vertex buffers (shared pointer vector) to base declaration on. Higher index buffers will override semantics on lower indices.
    VertexDeclaration_D3D9(Graphics* graphics, const Vector<SharedPtr<VertexBuffer>>& buffers);
    /// Destruct.
    ~VertexDeclaration_D3D9();

    /// Return Direct3D vertex declaration.
    IDirect3DVertexDeclaration9* GetDeclaration() const { return declaration_; }

private:
    /// Create declaration.
    void Create(Graphics* graphics, const PODVector<VertexDeclarationElement_D3D9>& elements);
    /// Release declaration.
    void Release();

    /// Direct3D vertex declaration.
    IDirect3DVertexDeclaration9* declaration_;
};

}