KeosShadersLoader.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 "KeosShadersLoader.h"
#include "KeosRenderSystem.h"
#include "KeosException.h"

namespace Keos
{
  //=======================================================================
  // CShadersLoader implementation
  //=======================================================================

  //-----------------------------------------------------------------------
  CShadersLoader::CShadersLoader(TShaderType Type) :
      m_Type(Type)
  {
    // Callback error
    cgSetErrorCallback(&OnError);

    // Context creation
    m_Context = cgCreateContext();
  }

  //-----------------------------------------------------------------------
  CShadersLoader::~CShadersLoader()
  {

    // Context destruction
    if (m_Context)
      cgDestroyContext(m_Context);
  }

  //-----------------------------------------------------------------------
  IShaderBase* CShadersLoader::LoadFromFile(const String& strFilename)
  {
    if (m_Type == SHADER_VERTEX && !Renderer->GetCapabilities()->HasCapability(CAP_VERTEX_PROGRAM))
      LOADINGFAILED_EXCEPT(strFilename, "Vertex programs (shaders) not supported !", "CShadersLoader::LoadFromFile");

    if (m_Type == SHADER_PIXEL && !Renderer->GetCapabilities()->HasCapability(CAP_FRAGMENT_PROGRAM))
      LOADINGFAILED_EXCEPT(strFilename, "Fragment programs (pixel shaders) not supported !", "CShadersLoader::LoadFromFile");

    // Load and compilation of the shader
    CGprogram Program;
    try
    {
      Program = cgCreateProgramFromFile(m_Context,
                                        CG_SOURCE,
                                        strFilename.c_str(),
                                        Renderer->GetShaderProfile(m_Type),
                                        "main",
                                        const_cast<const char**>(Renderer->GetShaderOptions(m_Type)));
    }
    catch (CException& E)
    {
      LOADINGFAILED_EXCEPT(strFilename, E.what() + std::string("\n") + cgGetLastListing(m_Context), "CShadersLoader::LoadFromFile");
    }

    return Renderer->CreateShader(Program, m_Type);
  }

  //-----------------------------------------------------------------------
  void CShadersLoader::OnError()
  {
    throw CException(cgGetErrorString(cgGetError()));
  }


} // namespace Keos

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