BufferInitData.h

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#pragma once

#include "swCommonLib/Common/MemoryChunk.h"
#include "swCommonLib/Common/RTTR.h"

#include "swGraphicAPI/Rendering/GraphicAPIConstants.h"
#include "swGraphicAPI/Resources/IBuffer.h"

#include <assert.h>

struct BufferInitData
{
    const uint8*    Data;           
    uint32          NumElements;
    uint32          ElementSize;
    rttr::type      DataType;       
    ResourceUsage   Usage;

    BufferInitData()
        :   DataType( rttr::type::get_by_name( "" ) )   // Set invalid type.
    {
        Usage = ResourceUsage::RESOURCE_USAGE_DEFAULT;
        NumElements = 1;
        ElementSize = 0;
        Data = nullptr;
    }
};


struct ConstantBufferInitData : public BufferInitData
{
    BufferInfo      CreateBufferInfo() const;
};



struct VertexBufferInitData : public BufferInitData
{
    ResourcePtr< ShaderInputLayout >    VertexLayout;       
    PrimitiveTopology                   Topology;           

    VertexBufferInitData()
    {
        Topology = PrimitiveTopology::PRIMITIVE_TOPOLOGY_POINTLIST;
    }

    BufferInfo      CreateBufferInfo() const;
};

struct IndexBufferInitData : public BufferInitData
{
    PrimitiveTopology                   Topology;           
    bool                                Use4BytesIndex;     

    IndexBufferInitData()
    {
        Topology = PrimitiveTopology::PRIMITIVE_TOPOLOGY_POINTLIST;
        Use4BytesIndex = false;
    }

    BufferInfo      CreateBufferInfo() const;
};


// ================================ //
//
inline BufferInfo       ConstantBufferInitData::CreateBufferInfo() const
{
    BufferInfo info;
    info.BufferType = BufferType::ConstantBuffer;
    info.ElementSize = ElementSize;
    info.NumElements = NumElements;
    info.DataType = DataType;
    info.Topology = PrimitiveTopology::PRIMITIVE_TOPOLOGY_POINTLIST;
    info.Usage = Usage;
    info.Use4BytesIndex = false;

    // Constant buffers must be 16 bytes aligned.
    assert( ElementSize % 16 == 0 );

    return info;
}

// ================================ //
//
inline BufferInfo       VertexBufferInitData::CreateBufferInfo() const
{
    BufferInfo info;
    info.BufferType = BufferType::VertexBuffer;
    info.ElementSize = ElementSize;
    info.NumElements = NumElements;
    info.DataType = DataType;
    info.Topology = Topology;
    info.Usage = Usage;
    info.Use4BytesIndex = false;
    info.VertexLayout = VertexLayout;

    return info;
}

// ================================ //
//
inline BufferInfo       IndexBufferInitData::CreateBufferInfo() const
{
    BufferInfo info;
    info.BufferType = BufferType::IndexBuffer;
    info.ElementSize = ElementSize;
    info.NumElements = NumElements;
    info.DataType = DataType;
    info.Topology = Topology;
    info.Usage = Usage;
    info.Use4BytesIndex = Use4BytesIndex;

    return info;
}