KeosOGLTexture.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 "KeosOGLTexture.h"
#include "KeosOGLEnum.h"
#include "KeosOGLRenderSystem.h"
#include "KeosPixelUtils.h"
#include "KeosRectangle.h"

namespace Keos
{
  //=======================================================================
  // COGLTexture implementation
  //=======================================================================

  //-----------------------------------------------------------------------
  COGLTexture::COGLTexture(const TVector2I& Size, TPixelFormat Format, bool bHasMipmaps, bool bAutoMipmaps, uint nTexture) :
      ITextureBase(Size, Format, bHasMipmaps, bAutoMipmaps),
      m_nTexture   (nTexture)
  {}

  //-----------------------------------------------------------------------
  COGLTexture::~COGLTexture()
  {
    if (m_nTexture)
      glDeleteTextures(1, &m_nTexture);
  }

  //-----------------------------------------------------------------------
  uint COGLTexture::GetOGLTexture() const
  {
    return m_nTexture;
  }

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

    // Get the formats of pixels of the texture and the image
    COGLEnum::TPixelFmt TexFmt = COGLEnum::Get(m_Format);
    COGLEnum::TPixelFmt ImgFmt = COGLEnum::Get(m_Data.GetFormat());

    // Activation of the current texture
    glBindTexture(GL_TEXTURE_2D, m_nTexture);

    // Update pixels of the texture
    if (FormatCompressed(m_Data.GetFormat()))
    {
      // Format de pixel compressé - on utilise une extension pour uploader les pixels
      ulong DataSize = Rect.Width() * Rect.Height() * GetBytesPerPixel(m_Data.GetFormat());
      if (Rect.Width() == m_Size.x && Rect.Height() == m_Size.y)
      {
        COGLRenderSystem::glCompressedTexSubImage2DARB(GL_TEXTURE_2D, 0, Rect.Left(), Rect.Top(), Rect.Width(), Rect.Height(), ImgFmt.Format, DataSize, m_Data.GetData());
      }
      else
      {
        CImage SubData = m_Data.SubImage(Rect);
        COGLRenderSystem::glCompressedTexSubImage2DARB(GL_TEXTURE_2D, 0, Rect.Left(), Rect.Top(), Rect.Width(), Rect.Height(), ImgFmt.Format, DataSize, SubData.GetData());
      }
    }
    else
    {
      if (!m_bHasMipmaps || m_bAutoMipmaps)
      {
        if ((Rect.Width() == m_Size.x) && (Rect.Height() == m_Size.y))
        {
          glTexSubImage2D(GL_TEXTURE_2D, 0, Rect.Left(), Rect.Top(), Rect.Width(), Rect.Height(), ImgFmt.Format, ImgFmt.Type, m_Data.GetData());
        }
        else
        {
          CImage SubData = m_Data.SubImage(Rect);
          glTexSubImage2D(GL_TEXTURE_2D, 0, Rect.Left(), Rect.Top(), Rect.Width(), Rect.Height(), ImgFmt.Format, ImgFmt.Type, SubData.GetData());
        }
      }
      else
      {
        gluBuild2DMipmaps(GL_TEXTURE_2D, TexFmt.Internal, m_Size.x, m_Size.y, ImgFmt.Format, ImgFmt.Type, m_Data.GetData());
      }
    }

    // Deactivation of the texture
    glBindTexture(GL_TEXTURE_2D, 0);
  }

} // namespace Keos

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