source: orxonox.OLD/branches/volumetric_fog/src/world_entities/particles/dot_particles.cc

/*
   orxonox - the future of 3D-vertical-scrollers

   Copyright (C) 2004 orx

   This program 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, or (at your option)
   any later version.

   ### File Specific:
   main-programmer: Benjamin Grauer
   co-programmer: ...
*/

#define DEBUG_SPECIAL_MODULE DEBUG_MODULE_GRAPHICS

#include "dot_particles.h"

#include "util/loading/load_param.h"
#include "util/loading/factory.h"
#include "material.h"
#include "state.h"

#include "class_id_DEPRECATED.h"

ObjectListDefinitionID(DotParticles, CL_DOT_PARTICLES);
CREATE_FACTORY(DotParticles);


/**
 *  standard constructor
 * @param maxCount the Count of particles in the System
 * @param type The Type of the DotParticles
*/
DotParticles::DotParticles (unsigned int maxCount)
  : ParticleSystem(maxCount)
{
  this->init();
}

/**
 * @brief creates a Particle System out of a XML-element
 * @param root: the XML-element to load from
 */
DotParticles::DotParticles(const TiXmlElement* root)
{
  this->init();
  if (root != NULL)
    this->loadParams(root);
}

/**
 *  standard deconstructor
*/
DotParticles::~DotParticles()
{ }

/**
 * @brief initializes the DotParticles with default values
*/
void DotParticles::init()
{
  this->registerObject(this, DotParticles::_objectList);

  this->material.setDiffuseMap("maps/radial-trans-noise.png");
}


/**
 * loads Parameters from a TiXmlElement
 * @param root the XML-element to load from.
 */
void DotParticles::loadParams(const TiXmlElement* root)
{
  ParticleSystem::loadParams(root);
}

/**
 * @brief draws all the Particles of this System
 *
 * The Cases in this Function all do the same:
 * Drawing all the particles with the appropriate Type.
 * This is just the fastest Way to do this, but will most likely be changed in the future.
 */
void DotParticles::draw() const
{
  glPushAttrib(GL_ENABLE_BIT);

  GLboolean checkLight = false;
  glGetBooleanv(GL_LIGHTING, &checkLight);
  if (checkLight == GL_TRUE)
    glDisable(GL_LIGHTING);

  glMatrixMode(GL_MODELVIEW);
  glBlendFunc(GL_SRC_ALPHA, GL_DST_ALPHA);

  Particle* drawPart = particles;
  //glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_ENV_MODE, GL_MODULATE);

  glBegin(GL_POINTS);
  while (likely(drawPart != NULL))
  {
    glColor4fv(drawPart->color);
    glVertex3f(drawPart->position.x, drawPart->position.y, drawPart->position.z);

    drawPart = drawPart->next;
  }
  glEnd();
  glPopAttrib();
}