#include "d3d11_device.h"
#include "d3d11_buffer.h"
#include "d3d11_resource.h"
#include "d3d11_texture.h"
#include "d3d11_view_uav.h"

namespace dxvk {
  
  D3D11UnorderedAccessView::D3D11UnorderedAccessView(
          D3D11Device*                       pDevice,
          ID3D11Resource*                    pResource,
    const D3D11_UNORDERED_ACCESS_VIEW_DESC1* pDesc)
  : m_device(pDevice), m_resource(pResource), m_desc(*pDesc) {
    ResourceAddRefPrivate(m_resource);

    D3D11_COMMON_RESOURCE_DESC resourceDesc;
    GetCommonResourceDesc(pResource, &resourceDesc);
    
    // Basic view resource info
    m_info.pResource = pResource;
    m_info.Dimension = resourceDesc.Dim;
    m_info.BindFlags = resourceDesc.BindFlags;

    if (resourceDesc.Dim == D3D11_RESOURCE_DIMENSION_BUFFER) {
      auto buffer = static_cast<D3D11Buffer*>(pResource);
      
      DxvkBufferViewCreateInfo viewInfo;
      
      if (pDesc->Buffer.Flags & D3D11_BUFFEREX_SRV_FLAG_RAW) {
        viewInfo.format      = VK_FORMAT_R32_UINT;
        viewInfo.rangeOffset = sizeof(uint32_t) * pDesc->Buffer.FirstElement;
        viewInfo.rangeLength = sizeof(uint32_t) * pDesc->Buffer.NumElements;
      } else if (pDesc->Format == DXGI_FORMAT_UNKNOWN) {
        viewInfo.format      = VK_FORMAT_R32_UINT;
        viewInfo.rangeOffset = buffer->Desc()->StructureByteStride * pDesc->Buffer.FirstElement;
        viewInfo.rangeLength = buffer->Desc()->StructureByteStride * pDesc->Buffer.NumElements;
      } else {
        viewInfo.format = pDevice->LookupFormat(pDesc->Format, DXGI_VK_FORMAT_MODE_COLOR).Format;
        
        const DxvkFormatInfo* formatInfo = imageFormatInfo(viewInfo.format);
        viewInfo.rangeOffset = formatInfo->elementSize * pDesc->Buffer.FirstElement;
        viewInfo.rangeLength = formatInfo->elementSize * pDesc->Buffer.NumElements;
      }
      
      if (pDesc->Buffer.Flags & (D3D11_BUFFER_UAV_FLAG_APPEND | D3D11_BUFFER_UAV_FLAG_COUNTER))
        m_counterBuffer = CreateCounterBuffer();
      
      // Populate view info struct
      m_info.Buffer.Offset = viewInfo.rangeOffset;
      m_info.Buffer.Length = viewInfo.rangeLength;

      m_bufferView = pDevice->GetDXVKDevice()->createBufferView(
        buffer->GetBuffer(), viewInfo);
    } else {
      const DXGI_VK_FORMAT_INFO formatInfo = pDevice->LookupFormat(
        pDesc->Format, GetCommonTexture(pResource)->GetFormatMode());
      
      DxvkImageViewCreateInfo viewInfo;
      viewInfo.format  = formatInfo.Format;
      viewInfo.aspect  = formatInfo.Aspect;
      viewInfo.swizzle = formatInfo.Swizzle;
      viewInfo.usage   = VK_IMAGE_USAGE_STORAGE_BIT;
      
      switch (pDesc->ViewDimension) {
        case D3D11_UAV_DIMENSION_TEXTURE1D:
          viewInfo.type      = VK_IMAGE_VIEW_TYPE_1D;
          viewInfo.minLevel  = pDesc->Texture1D.MipSlice;
          viewInfo.numLevels = 1;
          viewInfo.minLayer  = 0;
          viewInfo.numLayers = 1;
          break;
          
        case D3D11_UAV_DIMENSION_TEXTURE1DARRAY:
          viewInfo.type      = VK_IMAGE_VIEW_TYPE_1D_ARRAY;
          viewInfo.minLevel  = pDesc->Texture1DArray.MipSlice;
          viewInfo.numLevels = 1;
          viewInfo.minLayer  = pDesc->Texture1DArray.FirstArraySlice;
          viewInfo.numLayers = pDesc->Texture1DArray.ArraySize;
          break;
          
        case D3D11_UAV_DIMENSION_TEXTURE2D:
          viewInfo.type      = VK_IMAGE_VIEW_TYPE_2D;
          viewInfo.minLevel  = pDesc->Texture2D.MipSlice;
          viewInfo.numLevels = 1;
          viewInfo.minLayer  = 0;
          viewInfo.numLayers = 1;
          break;
          
        case D3D11_UAV_DIMENSION_TEXTURE2DARRAY:
          viewInfo.type      = VK_IMAGE_VIEW_TYPE_2D_ARRAY;
          viewInfo.minLevel  = pDesc->Texture2DArray.MipSlice;
          viewInfo.numLevels = 1;
          viewInfo.minLayer  = pDesc->Texture2DArray.FirstArraySlice;
          viewInfo.numLayers = pDesc->Texture2DArray.ArraySize;
          break;
          
        case D3D11_UAV_DIMENSION_TEXTURE3D:
          // FIXME we actually have to map this to a
          // 2D array view in order to support W slices
          viewInfo.type      = VK_IMAGE_VIEW_TYPE_3D;
          viewInfo.minLevel  = pDesc->Texture3D.MipSlice;
          viewInfo.numLevels = 1;
          viewInfo.minLayer  = 0;
          viewInfo.numLayers = 1;
          break;
          
        default:
          throw DxvkError("D3D11: Invalid view dimension for image UAV");
      }

      // Populate view info struct
      m_info.Image.Aspects   = viewInfo.aspect;
      m_info.Image.MinLevel  = viewInfo.minLevel;
      m_info.Image.MinLayer  = viewInfo.minLayer;
      m_info.Image.NumLevels = viewInfo.numLevels;
      m_info.Image.NumLayers = viewInfo.numLayers;

      m_imageView = pDevice->GetDXVKDevice()->createImageView(
        GetCommonTexture(pResource)->GetImage(), viewInfo);
    }
  }
  
  
  D3D11UnorderedAccessView::~D3D11UnorderedAccessView() {
    ResourceReleasePrivate(m_resource);
  }
  
  
  HRESULT STDMETHODCALLTYPE D3D11UnorderedAccessView::QueryInterface(REFIID riid, void** ppvObject) {
    if (ppvObject == nullptr)
      return E_POINTER;

    *ppvObject = nullptr;
    
    if (riid == __uuidof(IUnknown)
     || riid == __uuidof(ID3D11DeviceChild)
     || riid == __uuidof(ID3D11View)
     || riid == __uuidof(ID3D11UnorderedAccessView)
     || riid == __uuidof(ID3D11UnorderedAccessView1)) {
      *ppvObject = ref(this);
      return S_OK;
    }
    
    Logger::warn("D3D11UnorderedAccessView::QueryInterface: Unknown interface query");
    Logger::warn(str::format(riid));
    return E_NOINTERFACE;
  }
  
  
  void STDMETHODCALLTYPE D3D11UnorderedAccessView::GetDevice(ID3D11Device** ppDevice) {
    *ppDevice = m_device.ref();
  }
  
  
  void STDMETHODCALLTYPE D3D11UnorderedAccessView::GetResource(ID3D11Resource** ppResource) {
    *ppResource = ref(m_resource);
  }
  
  
  void STDMETHODCALLTYPE D3D11UnorderedAccessView::GetDesc(D3D11_UNORDERED_ACCESS_VIEW_DESC* pDesc) {
    pDesc->Format            = m_desc.Format;
    pDesc->ViewDimension     = m_desc.ViewDimension;

    switch (m_desc.ViewDimension) {
      case D3D11_UAV_DIMENSION_UNKNOWN:
        break;

      case D3D11_UAV_DIMENSION_BUFFER:
        pDesc->Buffer = m_desc.Buffer;
        break;

      case D3D11_UAV_DIMENSION_TEXTURE1D:
        pDesc->Texture1D = m_desc.Texture1D;
        break;

      case D3D11_UAV_DIMENSION_TEXTURE1DARRAY:
        pDesc->Texture1DArray = m_desc.Texture1DArray;
        break;

      case D3D11_UAV_DIMENSION_TEXTURE2D:
        pDesc->Texture2D.MipSlice = m_desc.Texture2D.MipSlice;
        break;

      case D3D11_UAV_DIMENSION_TEXTURE2DARRAY:
        pDesc->Texture2DArray.MipSlice        = m_desc.Texture2DArray.MipSlice;
        pDesc->Texture2DArray.FirstArraySlice = m_desc.Texture2DArray.FirstArraySlice;
        pDesc->Texture2DArray.ArraySize       = m_desc.Texture2DArray.ArraySize;
        break;

      case D3D11_UAV_DIMENSION_TEXTURE3D:
        pDesc->Texture3D = m_desc.Texture3D;
        break;
    }
  }
  
  
  void STDMETHODCALLTYPE D3D11UnorderedAccessView::GetDesc1(D3D11_UNORDERED_ACCESS_VIEW_DESC1* pDesc) {
    *pDesc = m_desc;
  }
  
  
  HRESULT D3D11UnorderedAccessView::GetDescFromResource(
          ID3D11Resource*                    pResource,
          D3D11_UNORDERED_ACCESS_VIEW_DESC1* pDesc) {
    D3D11_RESOURCE_DIMENSION resourceDim = D3D11_RESOURCE_DIMENSION_UNKNOWN;
    pResource->GetType(&resourceDim);
    
    switch (resourceDim) {
      case D3D11_RESOURCE_DIMENSION_BUFFER: {
        D3D11_BUFFER_DESC bufferDesc;
        static_cast<D3D11Buffer*>(pResource)->GetDesc(&bufferDesc);
        
        if (bufferDesc.MiscFlags == D3D11_RESOURCE_MISC_BUFFER_STRUCTURED) {
          pDesc->Format              = DXGI_FORMAT_UNKNOWN;
          pDesc->ViewDimension       = D3D11_UAV_DIMENSION_BUFFER;
          pDesc->Buffer.FirstElement = 0;
          pDesc->Buffer.NumElements  = bufferDesc.ByteWidth / bufferDesc.StructureByteStride;
          return S_OK;
        }
      } return E_INVALIDARG;
      
      case D3D11_RESOURCE_DIMENSION_TEXTURE1D: {
        D3D11_TEXTURE1D_DESC resourceDesc;
        static_cast<D3D11Texture1D*>(pResource)->GetDesc(&resourceDesc);
        
        pDesc->Format = resourceDesc.Format;
        
        if (resourceDesc.ArraySize == 1) {
          pDesc->ViewDimension = D3D11_UAV_DIMENSION_TEXTURE1D;
          pDesc->Texture1D.MipSlice = 0;
        } else {
          pDesc->ViewDimension = D3D11_UAV_DIMENSION_TEXTURE1DARRAY;
          pDesc->Texture1DArray.MipSlice        = 0;
          pDesc->Texture1DArray.FirstArraySlice = 0;
          pDesc->Texture1DArray.ArraySize       = resourceDesc.ArraySize;
        }
      } return S_OK;
      
      case D3D11_RESOURCE_DIMENSION_TEXTURE2D: {
        D3D11_TEXTURE2D_DESC resourceDesc;
        static_cast<D3D11Texture2D*>(pResource)->GetDesc(&resourceDesc);
        
        pDesc->Format = resourceDesc.Format;
        
        if (resourceDesc.ArraySize == 1) {
          pDesc->ViewDimension = D3D11_UAV_DIMENSION_TEXTURE2D;
          pDesc->Texture2D.MipSlice   = 0;
          pDesc->Texture2D.PlaneSlice = 0;
        } else {
          pDesc->ViewDimension = D3D11_UAV_DIMENSION_TEXTURE2DARRAY;
          pDesc->Texture2DArray.MipSlice        = 0;
          pDesc->Texture2DArray.FirstArraySlice = 0;
          pDesc->Texture2DArray.ArraySize       = resourceDesc.ArraySize;
          pDesc->Texture2DArray.PlaneSlice      = 0;
        }
      } return S_OK;
      
      case D3D11_RESOURCE_DIMENSION_TEXTURE3D: {
        D3D11_TEXTURE3D_DESC resourceDesc;
        static_cast<D3D11Texture3D*>(pResource)->GetDesc(&resourceDesc);
        
        pDesc->Format        = resourceDesc.Format;
        pDesc->ViewDimension = D3D11_UAV_DIMENSION_TEXTURE3D;
        pDesc->Texture3D.MipSlice = 0;
        pDesc->Texture3D.WSize    = resourceDesc.Depth;
      } return S_OK;
      
      default:
        Logger::err(str::format(
          "D3D11: Unsupported dimension for unordered access view: ",
          resourceDim));
        return E_INVALIDARG;
    }
  }
  
  
  D3D11_UNORDERED_ACCESS_VIEW_DESC1 D3D11UnorderedAccessView::PromoteDesc(
    const D3D11_UNORDERED_ACCESS_VIEW_DESC*  pDesc) {
    D3D11_UNORDERED_ACCESS_VIEW_DESC1 dstDesc;
    dstDesc.Format            = pDesc->Format;
    dstDesc.ViewDimension     = pDesc->ViewDimension;

    switch (pDesc->ViewDimension) {
      case D3D11_UAV_DIMENSION_UNKNOWN:
        break;

      case D3D11_UAV_DIMENSION_BUFFER:
        dstDesc.Buffer = pDesc->Buffer;
        break;

      case D3D11_UAV_DIMENSION_TEXTURE1D:
        dstDesc.Texture1D = pDesc->Texture1D;
        break;

      case D3D11_UAV_DIMENSION_TEXTURE1DARRAY:
        dstDesc.Texture1DArray = pDesc->Texture1DArray;
        break;

      case D3D11_UAV_DIMENSION_TEXTURE2D:
        dstDesc.Texture2D.MipSlice   = pDesc->Texture2D.MipSlice;
        dstDesc.Texture2D.PlaneSlice = 0;
        break;

      case D3D11_UAV_DIMENSION_TEXTURE2DARRAY:
        dstDesc.Texture2DArray.MipSlice        = pDesc->Texture2DArray.MipSlice;
        dstDesc.Texture2DArray.FirstArraySlice = pDesc->Texture2DArray.FirstArraySlice;
        dstDesc.Texture2DArray.ArraySize       = pDesc->Texture2DArray.ArraySize;
        dstDesc.Texture2DArray.PlaneSlice      = 0;
        break;

      case D3D11_UAV_DIMENSION_TEXTURE3D:
        dstDesc.Texture3D = pDesc->Texture3D;
        break;
    }

    return dstDesc;
  }


  HRESULT D3D11UnorderedAccessView::NormalizeDesc(
          ID3D11Resource*                    pResource,
          D3D11_UNORDERED_ACCESS_VIEW_DESC1* pDesc) {
    D3D11_RESOURCE_DIMENSION resourceDim = D3D11_RESOURCE_DIMENSION_UNKNOWN;
    pResource->GetType(&resourceDim);
    
    DXGI_FORMAT format = DXGI_FORMAT_UNKNOWN;
    uint32_t numLayers = 0;
    
    switch (resourceDim) {
      case D3D11_RESOURCE_DIMENSION_BUFFER: {
        if (pDesc->ViewDimension != D3D11_UAV_DIMENSION_BUFFER) {
          Logger::err("D3D11: Incompatible view dimension for Buffer");
          return E_INVALIDARG;
        }
      } break;
      
      case D3D11_RESOURCE_DIMENSION_TEXTURE1D: {
        D3D11_TEXTURE1D_DESC resourceDesc;
        static_cast<D3D11Texture1D*>(pResource)->GetDesc(&resourceDesc);
        
        if (pDesc->ViewDimension != D3D11_UAV_DIMENSION_TEXTURE1D
         && pDesc->ViewDimension != D3D11_UAV_DIMENSION_TEXTURE1DARRAY) {
          Logger::err("D3D11: Incompatible view dimension for Texture1D");
          return E_INVALIDARG;
        }
        
        format    = resourceDesc.Format;
        numLayers = resourceDesc.ArraySize;
      } break;
      
      case D3D11_RESOURCE_DIMENSION_TEXTURE2D: {
        D3D11_TEXTURE2D_DESC resourceDesc;
        static_cast<D3D11Texture2D*>(pResource)->GetDesc(&resourceDesc);
        
        if (pDesc->ViewDimension != D3D11_UAV_DIMENSION_TEXTURE2D
         && pDesc->ViewDimension != D3D11_UAV_DIMENSION_TEXTURE2DARRAY) {
          Logger::err("D3D11: Incompatible view dimension for Texture2D");
          return E_INVALIDARG;
        }
        
        format    = resourceDesc.Format;
        numLayers = resourceDesc.ArraySize;
      } break;
      
      case D3D11_RESOURCE_DIMENSION_TEXTURE3D: {
        D3D11_TEXTURE3D_DESC resourceDesc;
        static_cast<D3D11Texture3D*>(pResource)->GetDesc(&resourceDesc);
        
        if (pDesc->ViewDimension != D3D11_UAV_DIMENSION_TEXTURE3D) {
          Logger::err("D3D11: Incompatible view dimension for Texture3D");
          return E_INVALIDARG;
        }
        
        format    = resourceDesc.Format;
        numLayers = std::max(resourceDesc.Depth >> pDesc->Texture3D.MipSlice, 1u);
      } break;
      
      default:
        return E_INVALIDARG;
    }
    
    if (pDesc->Format == DXGI_FORMAT_UNKNOWN)
      pDesc->Format = format;
    
    switch (pDesc->ViewDimension) {
      case D3D11_UAV_DIMENSION_BUFFER:
        if (pDesc->Buffer.NumElements == 0)
          return E_INVALIDARG;
        break;

      case D3D11_UAV_DIMENSION_TEXTURE1DARRAY:
        if (pDesc->Texture1DArray.ArraySize > numLayers - pDesc->Texture1DArray.FirstArraySlice)
          pDesc->Texture1DArray.ArraySize = numLayers - pDesc->Texture1DArray.FirstArraySlice;
        break;
      
      case D3D11_UAV_DIMENSION_TEXTURE2D:
        if (pDesc->Texture2D.PlaneSlice != 0)
          return E_INVALIDARG;
        break;

      case D3D11_UAV_DIMENSION_TEXTURE2DARRAY:
        if (pDesc->Texture2DArray.ArraySize > numLayers - pDesc->Texture2DArray.FirstArraySlice)
          pDesc->Texture2DArray.ArraySize = numLayers - pDesc->Texture2DArray.FirstArraySlice;
        
        if (pDesc->Texture2DArray.PlaneSlice != 0)
          return E_INVALIDARG;
        break;
      
      case D3D11_UAV_DIMENSION_TEXTURE3D:
        if (pDesc->Texture3D.WSize > numLayers - pDesc->Texture3D.FirstWSlice)
          pDesc->Texture3D.WSize = numLayers - pDesc->Texture3D.FirstWSlice;
        break;
      
      default:
        break;
    }
    
    return S_OK;
  }


  Rc<DxvkBuffer> D3D11UnorderedAccessView::CreateCounterBuffer() {
    Rc<DxvkDevice> device = m_device->GetDXVKDevice();

    DxvkBufferCreateInfo info;
    info.size   = sizeof(uint32_t);
    info.usage  = VK_BUFFER_USAGE_STORAGE_BUFFER_BIT
                | VK_BUFFER_USAGE_TRANSFER_DST_BIT
                | VK_BUFFER_USAGE_TRANSFER_SRC_BIT;
    info.stages = VK_PIPELINE_STAGE_TRANSFER_BIT
                | device->getShaderPipelineStages();
    info.access = VK_ACCESS_TRANSFER_WRITE_BIT
                | VK_ACCESS_TRANSFER_READ_BIT
                | VK_ACCESS_SHADER_WRITE_BIT
                | VK_ACCESS_SHADER_READ_BIT;
    return device->createBuffer(info, VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT);
  }
  
}
