text: //
  // Copyright (c) 2008-2016 the Urho3D project.
  //
  // Permission is hereby granted, free of charge, to any person obtaining a copy
  // of this software and associated documentation files (the "Software"), to deal
  // in the Software without restriction, including without limitation the rights
  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  // copies of the Software, and to permit persons to whom the Software is
  // furnished to do so, subject to the following conditions:
  //
  // The above copyright notice and this permission notice shall be included in
  // all copies or substantial portions of the Software.
  //
  // 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. IN NO EVENT SHALL THE
  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  // THE SOFTWARE.
  //
  
  #include "../../Precompiled.h"
  
  #include "../../Core/Context.h"
  #include "../../Core/Profiler.h"
  #include "../../Graphics/Graphics.h"
  #include "../../Graphics/GraphicsEvents.h"
  #include "../../Graphics/GraphicsImpl.h"
  #include "../../Graphics/Renderer.h"
  #include "../../Graphics/TextureCube.h"
  #include "../../IO/FileSystem.h"
  #include "../../IO/Log.h"
  #include "../../Resource/ResourceCache.h"
  #include "../../Resource/XMLFile.h"
  
  #include "../../DebugNew.h"
  
  #ifdef _MSC_VER
  #pragma warning(disable:4355)
  #endif
  
  namespace Urho3D
  {
  
  void TextureCube::OnDeviceLost()
  {
      // No-op on Direct3D11
  }
  
  void TextureCube::OnDeviceReset()
  {
      // No-op on Direct3D11
  }
  
  void TextureCube::Release()
  {
      if (graphics_)
      {
          for (unsigned i = 0; i < MAX_TEXTURE_UNITS; ++i)
          {
              if (graphics_->GetTexture(i) == this)
                  graphics_->SetTexture(i, 0);
          }
      }
  
      for (unsigned i = 0; i < MAX_CUBEMAP_FACES; ++i)
      {
          if (renderSurfaces_[i])
              renderSurfaces_[i]->Release();
      }
  
      URHO3D_SAFE_RELEASE(object_.ptr_);
      URHO3D_SAFE_RELEASE(shaderResourceView_);
      URHO3D_SAFE_RELEASE(sampler_);
  }
  
  bool TextureCube::SetData(CubeMapFace face, unsigned level, int x, int y, int width, int height, const void* data)
  {
      URHO3D_PROFILE(SetTextureData);
  
      if (!object_.ptr_)
      {
          URHO3D_LOGERROR("No texture created, can not set data");
          return false;
      }
  
      if (!data)
      {
          URHO3D_LOGERROR("Null source for setting data");
          return false;
      }
  
      if (level >= levels_)
      {
          URHO3D_LOGERROR("Illegal mip level for setting data");
          return false;
      }
  
      int levelWidth = GetLevelWidth(level);
      int levelHeight = GetLevelHeight(level);
      if (x < 0 || x + width > levelWidth || y < 0 || y + height > levelHeight || width <= 0 || height <= 0)
      {
          URHO3D_LOGERROR("Illegal dimensions for setting data");
          return false;
      }
  
      // If compressed, align the update region on a block
      if (IsCompressed())
      {
          x &= ~3;
          y &= ~3;
          width += 3;
          width &= 0xfffffffc;
          height += 3;
          height &= 0xfffffffc;
      }
  
      unsigned char* src = (unsigned char*)data;
      unsigned rowSize = GetRowDataSize(width);
      unsigned rowStart = GetRowDataSize(x);
      unsigned subResource = D3D11CalcSubresource(level, face, levels_);
  
      if (usage_ == TEXTURE_DYNAMIC)
      {
          if (IsCompressed())
          {
              height = (height + 3) >> 2;
              y >>= 2;
          }
  
          D3D11_MAPPED_SUBRESOURCE mappedData;
          mappedData.pData = 0;
  
          HRESULT hr = graphics_->GetImpl()->GetDeviceContext()->Map((ID3D11Resource*)object_.ptr_, subResource, D3D11_MAP_WRITE_DISCARD, 0,
              &mappedData);
          if (FAILED(hr) || !mappedData.pData)
          {
              URHO3D_LOGD3DERROR("Failed to map texture for update", hr);
              return false;
          }
          else
          {
              for (int row = 0; row < height; ++row)
                  memcpy((unsigned char*)mappedData.pData + (row + y) * mappedData.RowPitch + rowStart, src + row * rowSize, rowSize);
              graphics_->GetImpl()->GetDeviceContext()->Unmap((ID3D11Resource*)object_.ptr_, subResource);
          }
      }
      else
      {
          D3D11_BOX destBox;
          destBox.left = (UINT)x;
          destBox.right = (UINT)(x + width);
          destBox.top = (UINT)y;
          destBox.bottom = (UINT)(y + height);
          destBox.front = 0;
          destBox.back = 1;
  
          graphics_->GetImpl()->GetDeviceContext()->UpdateSubresource((ID3D11Resource*)object_.ptr_, subResource, &destBox, data,
              rowSize, 0);
      }
  
      return true;
  }
  
  bool TextureCube::SetData(CubeMapFace face, Deserializer& source)
  {
      SharedPtr<Image> image(new Image(context_));
      if (!image->Load(source))
          return false;
  
      return SetData(face, image);
  }
  
  bool TextureCube::SetData(CubeMapFace face, Image* image, bool useAlpha)
  {
      if (!image)
      {
          URHO3D_LOGERROR("Null image, can not load texture");
          return false;
      }
  
      // Use a shared ptr for managing the temporary mip images created during this function
      SharedPtr<Image> mipImage;
      unsigned memoryUse = 0;
      int quality = QUALITY_HIGH;
      Renderer* renderer = GetSubsystem<Renderer>();
      if (renderer)
          quality = renderer->GetTextureQuality();
  
      if (!image->IsCompressed())
      {
          // Convert unsuitable formats to RGBA
          unsigned components = image->GetComponents();
          if ((components == 1 && !useAlpha) || components == 2 || components == 3)
          {
              mipImage = image->ConvertToRGBA(); image = mipImage;
              if (!image)
                  return false;
              components = image->GetComponents();
          }
  
          unsigned char* levelData = image->GetData();
          int levelWidth = image->GetWidth();
          int levelHeight = image->GetHeight();
          unsigned format = 0;
  
          if (levelWidth != levelHeight)
          {
              URHO3D_LOGERROR("Cube texture width not equal to height");
              return false;
          }
  
          // Discard unnecessary mip levels
          for (unsigned i = 0; i < mipsToSkip_[quality]; ++i)
          {
              mipImage = image->GetNextLevel(); image = mipImage;
              levelData = image->GetData();
              levelWidth = image->GetWidth();
              levelHeight = image->GetHeight();
          }
  
          switch (components)
          {
          case 1:
              format = Graphics::GetAlphaFormat();
              break;
  
          case 4:
              format = Graphics::GetRGBAFormat();
              break;
  
          default: break;
          }
  
          // Create the texture when face 0 is being loaded, check that rest of the faces are same size & format
          if (!face)
          {
              // If image was previously compressed, reset number of requested levels to avoid error if level count is too high for new size
              if (IsCompressed() && requestedLevels_ > 1)
                  requestedLevels_ = 0;
              SetSize(levelWidth, format);
          }
          else
          {
              if (!object_.ptr_)
              {
                  URHO3D_LOGERROR("Cube texture face 0 must be loaded first");
                  return false;
              }
              if (levelWidth != width_ || format != format_)
              {
                  URHO3D_LOGERROR("Cube texture face does not match size or format of face 0");
                  return false;
              }
          }
  
          for (unsigned i = 0; i < levels_; ++i)
          {
              SetData(face, i, 0, 0, levelWidth, levelHeight, levelData);
              memoryUse += levelWidth * levelHeight * components;
  
              if (i < levels_ - 1)
              {
                  mipImage = image->GetNextLevel(); image = mipImage;
                  levelData = image->GetData();
                  levelWidth = image->GetWidth();
                  levelHeight = image->GetHeight();
              }
          }
      }
      else
      {
          int width = image->GetWidth();
          int height = image->GetHeight();
          unsigned levels = image->GetNumCompressedLevels();
          unsigned format = graphics_->GetFormat(image->GetCompressedFormat());
          bool needDecompress = false;
  
          if (width != height)
          {
              URHO3D_LOGERROR("Cube texture width not equal to height");
              return false;
          }
  
          if (!format)
          {
              format = Graphics::GetRGBAFormat();
              needDecompress = true;
          }
  
          unsigned mipsToSkip = mipsToSkip_[quality];
          if (mipsToSkip >= levels)
              mipsToSkip = levels - 1;
          while (mipsToSkip && (width / (1 << mipsToSkip) < 4 || height / (1 << mipsToSkip) < 4))
              --mipsToSkip;
          width /= (1 << mipsToSkip);
          height /= (1 << mipsToSkip);
  
          // Create the texture when face 0 is being loaded, assume rest of the faces are same size & format
          if (!face)
          {
              SetNumLevels(Max((levels - mipsToSkip), 1U));
              SetSize(width, format);
          }
          else
          {
              if (!object_.ptr_)
              {
                  URHO3D_LOGERROR("Cube texture face 0 must be loaded first");
                  return false;
              }
              if (width != width_ || format != format_)
              {
                  URHO3D_LOGERROR("Cube texture face does not match size or format of face 0");
                  return false;
              }
          }
  
          for (unsigned i = 0; i < levels_ && i < levels - mipsToSkip; ++i)
          {
              CompressedLevel level = image->GetCompressedLevel(i + mipsToSkip);
              if (!needDecompress)
              {
                  SetData(face, i, 0, 0, level.width_, level.height_, level.data_);
                  memoryUse += level.rows_ * level.rowSize_;
              }
              else
              {
                  unsigned char* rgbaData = new unsigned char[level.width_ * level.height_ * 4];
                  level.Decompress(rgbaData);
                  SetData(face, i, 0, 0, level.width_, level.height_, rgbaData);
                  memoryUse += level.width_ * level.height_ * 4;
                  delete[] rgbaData;
              }
          }
      }
  
      faceMemoryUse_[face] = memoryUse;
      unsigned totalMemoryUse = sizeof(TextureCube);
      for (unsigned i = 0; i < MAX_CUBEMAP_FACES; ++i)
          totalMemoryUse += faceMemoryUse_[i];
      SetMemoryUse(totalMemoryUse);
  
      return true;
  }
  
  bool TextureCube::GetData(CubeMapFace face, unsigned level, void* dest) const
  {
      if (!object_.ptr_)
      {
          URHO3D_LOGERROR("No texture created, can not get data");
          return false;
      }
  
      if (!dest)
      {
          URHO3D_LOGERROR("Null destination for getting data");
          return false;
      }
  
      if (level >= levels_)
      {
          URHO3D_LOGERROR("Illegal mip level for getting data");
          return false;
      }
  
      int levelWidth = GetLevelWidth(level);
      int levelHeight = GetLevelHeight(level);
  
      D3D11_TEXTURE2D_DESC textureDesc;
      memset(&textureDesc, 0, sizeof textureDesc);
      textureDesc.Width = (UINT)levelWidth;
      textureDesc.Height = (UINT)levelHeight;
      textureDesc.MipLevels = 1;
      textureDesc.ArraySize = 1;
      textureDesc.Format = (DXGI_FORMAT)format_;
      textureDesc.SampleDesc.Count = 1;
      textureDesc.SampleDesc.Quality = 0;
      textureDesc.Usage = D3D11_USAGE_STAGING;
      textureDesc.CPUAccessFlags = D3D11_CPU_ACCESS_READ;
  
      ID3D11Texture2D* stagingTexture = 0;
      HRESULT hr = graphics_->GetImpl()->GetDevice()->CreateTexture2D(&textureDesc, 0, &stagingTexture);
      if (FAILED(hr))
      {
          URHO3D_SAFE_RELEASE(stagingTexture);
          URHO3D_LOGD3DERROR("Failed to create staging texture for GetData", hr);
          return false;
      }
  
      unsigned srcSubResource = D3D11CalcSubresource(level, face, levels_);
      D3D11_BOX srcBox;
      srcBox.left = 0;
      srcBox.right = (UINT)levelWidth;
      srcBox.top = 0;
      srcBox.bottom = (UINT)levelHeight;
      srcBox.front = 0;
      srcBox.back = 1;
      graphics_->GetImpl()->GetDeviceContext()->CopySubresourceRegion(stagingTexture, 0, 0, 0, 0, (ID3D11Resource*)object_.ptr_,
          srcSubResource, &srcBox);
  
      D3D11_MAPPED_SUBRESOURCE mappedData;
      mappedData.pData = 0;
      unsigned rowSize = GetRowDataSize(levelWidth);
      unsigned numRows = (unsigned)(IsCompressed() ? (levelHeight + 3) >> 2 : levelHeight);
  
      hr = graphics_->GetImpl()->GetDeviceContext()->Map((ID3D11Resource*)stagingTexture, 0, D3D11_MAP_READ, 0, &mappedData);
      if (FAILED(hr) || !mappedData.pData)
      {
          URHO3D_LOGD3DERROR("Failed to map staging texture for GetData", hr);
          stagingTexture->Release();
          return false;
      }
      else
      {
          for (unsigned row = 0; row < numRows; ++row)
              memcpy((unsigned char*)dest + row * rowSize, (unsigned char*)mappedData.pData + row * mappedData.RowPitch, rowSize);
          graphics_->GetImpl()->GetDeviceContext()->Unmap((ID3D11Resource*)stagingTexture, 0);
          stagingTexture->Release();
          return true;
      }
  }
  
  bool TextureCube::Create()
  {
      Release();
  
      if (!graphics_ || !width_ || !height_)
          return false;
  
      levels_ = CheckMaxLevels(width_, height_, requestedLevels_);
  
      D3D11_TEXTURE2D_DESC textureDesc;
      memset(&textureDesc, 0, sizeof textureDesc);
      textureDesc.Width = (UINT)width_;
      textureDesc.Height = (UINT)height_;
      textureDesc.MipLevels = levels_;
      textureDesc.ArraySize = MAX_CUBEMAP_FACES;
      textureDesc.Format = (DXGI_FORMAT)(sRGB_ ? GetSRGBFormat(format_) : format_);
      textureDesc.SampleDesc.Count = 1;
      textureDesc.SampleDesc.Quality = 0;
      textureDesc.Usage = usage_ == TEXTURE_DYNAMIC ? D3D11_USAGE_DYNAMIC : D3D11_USAGE_DEFAULT;
      textureDesc.BindFlags = D3D11_BIND_SHADER_RESOURCE;
      if (usage_ == TEXTURE_RENDERTARGET)
          textureDesc.BindFlags |= D3D11_BIND_RENDER_TARGET;
      else if (usage_ == TEXTURE_DEPTHSTENCIL)
          textureDesc.BindFlags |= D3D11_BIND_DEPTH_STENCIL;
      textureDesc.CPUAccessFlags = usage_ == TEXTURE_DYNAMIC ? D3D11_CPU_ACCESS_WRITE : 0;
      textureDesc.MiscFlags = D3D11_RESOURCE_MISC_TEXTURECUBE;
  
      HRESULT hr = graphics_->GetImpl()->GetDevice()->CreateTexture2D(&textureDesc, 0, (ID3D11Texture2D**)&object_.ptr_);
      if (FAILED(hr))
      {
          URHO3D_SAFE_RELEASE(object_.ptr_);
          URHO3D_LOGD3DERROR("Failed to create texture", hr);
          return false;
      }
  
      D3D11_SHADER_RESOURCE_VIEW_DESC resourceViewDesc;
      memset(&resourceViewDesc, 0, sizeof resourceViewDesc);
      resourceViewDesc.Format = (DXGI_FORMAT)GetSRVFormat(textureDesc.Format);
      resourceViewDesc.ViewDimension = D3D11_SRV_DIMENSION_TEXTURECUBE;
      resourceViewDesc.Texture2D.MipLevels = (UINT)levels_;
  
      hr = graphics_->GetImpl()->GetDevice()->CreateShaderResourceView((ID3D11Resource*)object_.ptr_, &resourceViewDesc,
          (ID3D11ShaderResourceView**)&shaderResourceView_);
      if (FAILED(hr))
      {
          URHO3D_SAFE_RELEASE(shaderResourceView_);
          URHO3D_LOGD3DERROR("Failed to create shader resource view for texture", hr);
          return false;
      }
  
      if (usage_ == TEXTURE_RENDERTARGET)
      {
          for (unsigned i = 0; i < MAX_CUBEMAP_FACES; ++i)
          {
              D3D11_RENDER_TARGET_VIEW_DESC renderTargetViewDesc;
              memset(&renderTargetViewDesc, 0, sizeof renderTargetViewDesc);
              renderTargetViewDesc.Format = textureDesc.Format;
              renderTargetViewDesc.ViewDimension = D3D11_RTV_DIMENSION_TEXTURE2DARRAY;
              renderTargetViewDesc.Texture2DArray.ArraySize = 1;
              renderTargetViewDesc.Texture2DArray.FirstArraySlice = i;
              renderTargetViewDesc.Texture2DArray.MipSlice = 0;
  
              hr = graphics_->GetImpl()->GetDevice()->CreateRenderTargetView((ID3D11Resource*)object_.ptr_, &renderTargetViewDesc,
                  (ID3D11RenderTargetView**)&renderSurfaces_[i]->renderTargetView_);
  
              if (FAILED(hr))
              {
                  URHO3D_SAFE_RELEASE(renderSurfaces_[i]->renderTargetView_);
                  URHO3D_LOGD3DERROR("Failed to create rendertarget view for texture", hr);
                  return false;
              }
          }
      }
  
      return true;
  }
  
  }
  