/*
 * Renderer.cpp
 *
 * Copyright (C) 2009 Matthias Schiffer <matthias@gamezock.de>
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 */

#include "Renderer.h"
#include "BSPTree.h"
#include "gl.h"

namespace Zoom {

void Renderer::render(const BSPTree &tree) {
  vmml::mat4f transform, inverseTransform;
  glGetFloatv(GL_MODELVIEW_MATRIX, transform.array);

  transform.inverse(inverseTransform);

  vmml::vec3f viewPoint = inverseTransform*vmml::vec3f::ZERO;

  glBegin(GL_TRIANGLES);
  tree.visit(renderVisitor, viewPoint);
  glEnd();

}

void Renderer::render(const std::list<BSPTree::TriangleRecord> &triangles) {
  glBegin(GL_TRIANGLES);
  for(std::list<BSPTree::TriangleRecord>::const_iterator t = triangles.begin(); t != triangles.end(); ++t) {
    renderTriangle(t->triangle);
  }
  glEnd();
}

void Renderer::renderTriangle(const Triangle &t) {
  glColor4fv(t.getColor().array);

  if(t.getTexture() != lastTexture) {
    glEnd();

    if(t.getTexture()) {
      glBindTexture(GL_TEXTURE_2D, t.getTexture());

      if(!lastTexture) {
        glEnable(GL_TEXTURE_2D);
      }
    }
    else {
      glDisable(GL_TEXTURE_2D);
    }

    lastTexture = t.getTexture();

    glBegin(GL_TRIANGLES);
  }

  for(int i = 0; i < 3; ++i) {
    glTexCoord2fv(t.getTexCoords(i).array);
    glNormal3fv(t.getNormal(i).array);
    glVertex3fv(t.getVertex(i).array);
  }
}

}