/*
   This file is part of the VRender library.
   Copyright (C) 2005 Cyril Soler (Cyril.Soler@imag.fr)
   Version 1.0.0, released on June 27, 2005.

   http://artis.imag.fr/Members/Cyril.Soler/VRender

   VRender is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   VRender 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 General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with VRender; if not, write to the Free Software Foundation, Inc.,
   59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 */

/****************************************************************************

   Copyright (C) 2002-2008 Gilles Debunne. All rights reserved.

   This file is part of the QGLViewer library version 2.3.5.

   http://www.libqglviewer.com - contact@libqglviewer.com

   This file may be used under the terms of the GNU General Public License
   versions 2.0 or 3.0 as published by the Free Software Foundation and
   appearing in the LICENSE file included in the packaging of this file.
   In addition, as a special exception, Gilles Debunne gives you certain
   additional rights, described in the file GPL_EXCEPTION in this package.

   libQGLViewer uses dual licensing. Commercial/proprietary software must
   purchase a libQGLViewer Commercial License.

   This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
   WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

 *****************************************************************************/

#include "../config.h"

#ifdef WINDOWS
#  include <windows.h>
#endif

#ifdef __APPLE__
#  include <OpenGL/gl.h>
#else
#  include <GL/gl.h>
#endif

#include <stdio.h>
#include <vector>
#include <stdlib.h>
#include <string.h>

#include "VRender.h"
#include "ParserGL.h"
#include "Exporter.h"
#include "SortMethod.h"
#include "Optimizer.h"

using namespace vrender;
using namespace std;

void vrender::VectorialRender(RenderCB render_callback, void* callback_params, VRenderParams& vparams)
{
  GLfloat* feedbackBuffer = NULL;
  SortMethod* sort_method = NULL;
  Exporter* exporter = NULL;

  try {
    GLint returned = -1;

    vparams.error() = 0;

    int nb_renders = 0;

    vparams.progress(0.0, QGLViewer::tr("Rendering..."));

    while(returned < 0) {
      if(feedbackBuffer != NULL)
        delete[] feedbackBuffer;

      feedbackBuffer = new GLfloat[vparams.size()];

      if(feedbackBuffer == NULL)
        throw std::runtime_error("Out of memory during feedback buffer allocation.");

      glFeedbackBuffer(vparams.size(), GL_3D_COLOR, feedbackBuffer);
      glRenderMode(GL_FEEDBACK);
      render_callback(callback_params);
      returned = glRenderMode(GL_RENDER);

      nb_renders++;

      if(returned < 0)
        vparams.size() *= 2;
    }

#ifdef A_VOIR
    if(SortMethod != EPS_DONT_SORT) {
      GLint depth_bits;
      glGetIntegerv(GL_DEPTH_BITS, &depth_bits);

      EGALITY_EPS = 2.0 / (1 << depth_bits);
      LINE_EGALITY_EPS = 2.0 / (1 << depth_bits);
    }
#endif
    if(returned > vparams.size())
      vparams.size() = returned;
#ifdef _VRENDER_DEBUG
    cout << "Size = " << vparams.size() << ", returned=" << returned << endl;
#endif

    //  On a un beau feedback buffer tout plein de saloperies. Faut aller
    // defricher tout ca. Ouaiiiis !

    vector<PtrPrimitive> primitive_tab;

    ParserGL parserGL;
    parserGL.parseFeedbackBuffer(feedbackBuffer, returned, primitive_tab, vparams);

    if(feedbackBuffer != NULL) {
      delete[] feedbackBuffer;
      feedbackBuffer = NULL;
    }

    if(vparams.isEnabled(VRenderParams::OptimizeBackFaceCulling)) {
      BackFaceCullingOptimizer bfopt;
      bfopt.optimize(primitive_tab, vparams);
    }

    // Lance la methode de sorting

    switch(vparams.sortMethod()) {
    case VRenderParams::AdvancedTopologicalSort:
    case VRenderParams::TopologicalSort: {
      TopologicalSortMethod* tsm = new TopologicalSortMethod();
      tsm->setBreakCycles(vparams.sortMethod() == VRenderParams::AdvancedTopologicalSort);
      sort_method = tsm;
    } break;

    case VRenderParams::BSPSort:
      sort_method = new BSPSortMethod();
      break;

    case VRenderParams::NoSorting:
      sort_method = new DontSortMethod();
      break;
    default:
      throw std::runtime_error("Unknown sorting method.");
    }

    sort_method->sortPrimitives(primitive_tab, vparams);

    // Lance les optimisations. L'ordre est important.

    if(vparams.isEnabled(VRenderParams::CullHiddenFaces)) {
      VisibilityOptimizer vopt;
      vopt.optimize(primitive_tab, vparams);
    }

#ifdef A_FAIRE
    if(vparams.isEnabled(VRenderParams::OptimizePrimitiveSplit)) {
      PrimitiveSplitOptimizer psopt;
      psopt.optimize(primitive_tab);
    }
#endif
    // Ecrit le fichier

    switch(vparams.format()) {
    case VRenderParams::EPS:
      exporter = new EPSExporter();
      break;
    case VRenderParams::PS:
      exporter = new PSExporter();
      break;
    case VRenderParams::XFIG:
      exporter = new FIGExporter();
      break;
#ifdef A_FAIRE
    case VRenderParams::SVG:
      exporter = new SVGExporter();
      break;
#endif
    default:
      throw std::runtime_error(
              "Sorry, this output format is not handled now. Only EPS and PS are currently supported.");
    }

    // sets background and black & white options

    GLfloat viewport[4], clearColor[4], lineWidth, pointSize;

    glGetFloatv(GL_COLOR_CLEAR_VALUE, clearColor);
    glGetFloatv(GL_LINE_WIDTH, &lineWidth);
    glGetFloatv(GL_POINT_SIZE, &pointSize);
    glGetFloatv(GL_VIEWPORT, viewport);

    lineWidth /= (float)max(viewport[2] - viewport[0], viewport[3] - viewport[1]);

    // Sets which bounding box to use.

    if(vparams.isEnabled(VRenderParams::TightenBoundingBox))
      exporter->setBoundingBox(parserGL.xmin(), parserGL.ymin(), parserGL.xmax(), parserGL.ymax());
    else
      exporter->setBoundingBox(viewport[0], viewport[1], viewport[0] + viewport[2], viewport[1] + viewport[3]);

    exporter->setBlackAndWhite(vparams.isEnabled(VRenderParams::RenderBlackAndWhite));
    exporter->setClearBackground(vparams.isEnabled(VRenderParams::AddBackground));
    exporter->setClearColor(clearColor[0], clearColor[1], clearColor[2]);

    exporter->exportToFile(vparams.filename(), primitive_tab, vparams);

    // deletes primitives

    for(unsigned int i = 0; i < primitive_tab.size(); ++i)
      delete primitive_tab[i];

    if(exporter != NULL)
      delete exporter;
    if(sort_method != NULL)
      delete sort_method;
  }
  catch(exception& e) {
    cout << "Render aborted: " << e.what() << endl;

    if(exporter != NULL)
      delete exporter;
    if(sort_method != NULL)
      delete sort_method;
    if(feedbackBuffer != NULL)
      delete[] feedbackBuffer;

    throw e;
  }
}

VRenderParams::VRenderParams()
{
  _options = 0;
  _format = EPS;
  _filename = "";
  _progress_function = NULL;
  _sortMethod = BSPSort;
}

VRenderParams::~VRenderParams() {
}

void VRenderParams::progress(float f, const QString& progress_string) {
  _progress_function(f, progress_string);
}

void VRenderParams::setFilename(const QString& filename) {
  _filename = filename;
}

void VRenderParams::setOption(VRenderOption opt, bool b)
{
  if(b)
    _options |= opt;
  else
    _options &= ~opt;
}

bool VRenderParams::isEnabled(VRenderOption opt) {
  return (_options & opt) > 0;
}
