KeosD3D9Texture.cpp

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/*
 * This source file is part of KEOS (Free 3D Engine)
 * For the latest info, see http://www.keosengine.org/
 * E-mails : thierry.vouriot@keosengine.org, yeri@keosengine.org
 *
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free Software
 * Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
 * Place - Suite 330, Boston, MA 02111-1307, USA, or go to
 * http://www.gnu.org/copyleft/lesser.txt.
 *
 */
#include "KeosD3D9Texture.h"
#include "KeosD3D9Enum.h"
#include "KeosD3D9RenderSystem.h"
#include "KeosD3D9Exception.h"
#include "KeosPixelUtils.h"
#include "KeosRectangle.h"

namespace Keos
{
  //=======================================================================
  // CD3D9Texture implementation
  //=======================================================================

  //-----------------------------------------------------------------------
  CD3D9Texture::CD3D9Texture(const TVector2I& Size, TPixelFormat Format, bool bHasMipmaps, bool bAutoMipmaps, IDirect3DTexture9* pTexture) :
      ITextureBase(Size, Format, bHasMipmaps, bAutoMipmaps),
      m_pTexture   (pTexture)
  {}

  //-----------------------------------------------------------------------
  CD3D9Texture::~CD3D9Texture()
  {}

  //-----------------------------------------------------------------------
  IDirect3DTexture9* CD3D9Texture::GetD3D9Texture() const
  {
    return m_pTexture;
  }

  //-----------------------------------------------------------------------
  void CD3D9Texture::Update(const CRectangle& Rect)
  {
    Assert(CRectangle(0, 0, m_Size.x, m_Size.y).Intersects(Rect) == INT_IN);

    // The format is the same --> simple copy
    if (m_Format == m_Data.GetFormat())
    {
      // Lock the texture
      D3DLOCKED_RECT LockedRect;
      RECT Lock = {Rect.Left(), Rect.Top(), Rect.Right(), Rect.Bottom()};
      m_pTexture->LockRect(0, &LockedRect, &Lock, 0);

      // Copy pixels
      UpdateSurface(LockedRect, Rect);

      // Unlock the texture
      m_pTexture->UnlockRect(0);
    }
    else
    {
      // Get the device
      LPDIRECT3DDEVICE9 Device = NULL;
      m_pTexture->GetDevice(&Device);

      // Create a texture in memory
      LPDIRECT3DSURFACE9 Src = NULL;
      if (FAILED(Device->CreateOffscreenPlainSurface(Rect.Width(), Rect.Height(), CD3D9Enum::Get(m_Data.GetFormat()), D3DPOOL_SYSTEMMEM, &Src, NULL)))
        D3D9_EXCEPT("Error in fonction CreateOffscreenPlainSurface", "CD3D9Texture::Update");

      // Lock the temp texture
      D3DLOCKED_RECT LockedRect;
      Src->LockRect(&LockedRect, NULL, 0);

      // Copy pixels
      UpdateSurface(LockedRect, Rect);

      // Unlock the temp texture
      Src->UnlockRect();

      // Get the level 0 surface of the texture
      LPDIRECT3DSURFACE9 Dest = NULL;
      m_pTexture->GetSurfaceLevel(0, &Dest);

      // Copy Src surface on Dest Surface (with format conversion)
      RECT DestRect = {Rect.Left(), Rect.Top(), Rect.Right(), Rect.Bottom()};
      if (FAILED(D3DXLoadSurfaceFromSurface(Dest, NULL, &DestRect, Src, NULL, NULL, D3DX_DEFAULT, 0)))
        D3D9_EXCEPT("Error in fonction D3DXLoadSurfaceFromSurface", "CD3D9Texture::Update");
    }

    // Mipmapping levels generation
    if (m_bHasMipmaps)
    {
      if (m_bAutoMipmaps)
        m_pTexture->GenerateMipSubLevels();
      else
        D3DXFilterTexture(m_pTexture, NULL, D3DX_DEFAULT, D3DX_DEFAULT);
    }
  }

  void CD3D9Texture::UpdateSurface(const D3DLOCKED_RECT& LockedRect, const CRectangle& Rect)
  {
    // Get A pointer on source and destination pixels
    unsigned char* DestPix = reinterpret_cast<unsigned char*>(LockedRect.pBits);
    const unsigned char* SrcPix = m_Data.GetData() + (Rect.Left() + Rect.Top() * m_Size.x) * GetBytesPerPixel(m_Data.GetFormat());

    // Copy pixels on the surface
    unsigned int Bpp = GetBytesPerPixel(m_Data.GetFormat());
    for (int i = 0; i < Rect.Height(); ++i)
    {
      std::copy(SrcPix, SrcPix + Rect.Width() * Bpp, DestPix);
      SrcPix  += m_Size.x * Bpp;
      DestPix += LockedRect.Pitch;
    }
  }
} // namespace Keos

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