/*     Copyright 2015-2019 Egor Yusov
 *  
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF ANY PROPRIETARY RIGHTS.
 *
 *  In no event and under no legal theory, whether in tort (including negligence), 
 *  contract, or otherwise, unless required by applicable law (such as deliberate 
 *  and grossly negligent acts) or agreed to in writing, shall any Contributor be
 *  liable for any damages, including any direct, indirect, special, incidental, 
 *  or consequential damages of any character arising as a result of this License or 
 *  out of the use or inability to use the software (including but not limited to damages 
 *  for loss of goodwill, work stoppage, computer failure or malfunction, or any and 
 *  all other commercial damages or losses), even if such Contributor has been advised 
 *  of the possibility of such damages.
 */

#include "pch.h"
#include "TextureBaseD3D11.h"
#include "RenderDeviceD3D11Impl.h"
#include "DeviceContextD3D11Impl.h"
#include "D3D11TypeConversions.h"
#include "TextureViewD3D11Impl.h"
#include "EngineMemory.h"

namespace Diligent
{

TextureBaseD3D11 :: TextureBaseD3D11(IReferenceCounters*        pRefCounters,
                                     FixedBlockMemoryAllocator& TexViewObjAllocator,
                                     RenderDeviceD3D11Impl*     pRenderDeviceD3D11,
                                     const TextureDesc&         TexDesc,
                                     const TextureData&         InitData /*= TextureData()*/) : 
    TTextureBase(pRefCounters, TexViewObjAllocator, pRenderDeviceD3D11, TexDesc)
{
    if( TexDesc.Usage == USAGE_STATIC && InitData.pSubResources == nullptr )
        LOG_ERROR_AND_THROW("Static Texture must be initialized with data at creation time");
    SetState(RESOURCE_STATE_UNDEFINED);
}

IMPLEMENT_QUERY_INTERFACE( TextureBaseD3D11, IID_TextureD3D11, TTextureBase )

void TextureBaseD3D11::CreateViewInternal( const struct TextureViewDesc &ViewDesc, ITextureView **ppView, bool bIsDefaultView )
{
    VERIFY( ppView != nullptr, "View pointer address is null" );
    if( !ppView )return;
    VERIFY(* ppView == nullptr, "Overwriting reference to existing object may cause memory leaks" );
    
   * ppView = nullptr;

    try
    {
        auto UpdatedViewDesc = ViewDesc;
        CorrectTextureViewDesc( UpdatedViewDesc );

        RefCntAutoPtr<ID3D11View> pD3D11View;
        switch( ViewDesc.ViewType )
        {
            case TEXTURE_VIEW_SHADER_RESOURCE:
            {
                VERIFY( m_Desc.BindFlags & BIND_SHADER_RESOURCE, "BIND_SHADER_RESOURCE flag is not set" );
                ID3D11ShaderResourceView* pSRV = nullptr;
                CreateSRV( UpdatedViewDesc, &pSRV );
                pD3D11View.Attach( pSRV );
            }
            break;

            case TEXTURE_VIEW_RENDER_TARGET:
            {
                VERIFY( m_Desc.BindFlags & BIND_RENDER_TARGET, "BIND_RENDER_TARGET flag is not set" );
                ID3D11RenderTargetView* pRTV = nullptr;
                CreateRTV( UpdatedViewDesc, &pRTV );
                pD3D11View.Attach( pRTV );
            }
            break;

            case TEXTURE_VIEW_DEPTH_STENCIL:
            {
                VERIFY( m_Desc.BindFlags & BIND_DEPTH_STENCIL, "BIND_DEPTH_STENCIL is not set" );
                ID3D11DepthStencilView* pDSV = nullptr;
                CreateDSV( UpdatedViewDesc, &pDSV );
                pD3D11View.Attach( pDSV );
            }
            break;

            case TEXTURE_VIEW_UNORDERED_ACCESS:
            {
                VERIFY( m_Desc.BindFlags & BIND_UNORDERED_ACCESS, "BIND_UNORDERED_ACCESS flag is not set" );
                ID3D11UnorderedAccessView* pUAV = nullptr;
                CreateUAV( UpdatedViewDesc, &pUAV );
                pD3D11View.Attach( pUAV );
            }
            break;

            default: UNEXPECTED( "Unknown view type" ); break;
        }

        auto* pDeviceD3D11Impl = ValidatedCast<RenderDeviceD3D11Impl>(GetDevice());
        auto &TexViewAllocator = pDeviceD3D11Impl->GetTexViewObjAllocator();
        VERIFY( &TexViewAllocator == &m_dbgTexViewObjAllocator, "Texture view allocator does not match allocator provided during texture initialization" );

        auto pViewD3D11 = NEW_RC_OBJ(TexViewAllocator, "TextureViewD3D11Impl instance", TextureViewD3D11Impl, bIsDefaultView ? this : nullptr)
                                    (pDeviceD3D11Impl, UpdatedViewDesc, this, pD3D11View, bIsDefaultView );
        VERIFY( pViewD3D11->GetDesc().ViewType == ViewDesc.ViewType, "Incorrect view type" );

        if( bIsDefaultView )
           * ppView = pViewD3D11;
        else
            pViewD3D11->QueryInterface(IID_TextureView, reinterpret_cast<IObject**>(ppView) );
    }
    catch( const std::runtime_error & )
    {
        const auto *ViewTypeName = GetTexViewTypeLiteralName(ViewDesc.ViewType);
        LOG_ERROR("Failed to create view \"", ViewDesc.Name ? ViewDesc.Name : "", "\" (", ViewTypeName, ") for texture \"", m_Desc.Name ? m_Desc.Name : "", "\"" );
    }
}

void TextureBaseD3D11 :: PrepareD3D11InitData(const TextureData& InitData, Uint32 NumSubresources, 
                                              std::vector<D3D11_SUBRESOURCE_DATA, STDAllocatorRawMem<D3D11_SUBRESOURCE_DATA> >  &D3D11InitData)
{
    if( InitData.pSubResources )
    {
        if( NumSubresources == InitData.NumSubresources )
        {
            D3D11InitData.resize(NumSubresources);
            for(UINT Subres=0; Subres < NumSubresources; ++Subres)
            {
                auto &CurrSubres = InitData.pSubResources[Subres];
                D3D11InitData[Subres].pSysMem = CurrSubres.pData;
                D3D11InitData[Subres].SysMemPitch = CurrSubres.Stride;
                D3D11InitData[Subres].SysMemSlicePitch = CurrSubres.DepthStride;
            }
        }
        else
            UNEXPECTED( "Incorrect number of subrsources" );
    }
}

TextureBaseD3D11 :: ~TextureBaseD3D11()
{
}

}
