source: orxonox.OLD/trunk/src/lib/graphics/importer/texture_data.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_IMPORTER

#include "texture.h"

#include "debug.h"
#include "compiler.h"


/**
 * @brief creates a new Texture Data.
 */
TextureData::TextureData()
{
  this->bAlpha = false;
  this->texture = 0;
  this->image = NULL;
  this->height = 0.;
  this->width = 0.;
}


/**
 * @brief Destructor of a Texture
 *
 *  Frees Data, and deletes the textures from GL
 */
TextureData::~TextureData()
{
  if (this->texture != 0)
    glDeleteTextures(1, &this->texture);
  if (this->image != NULL)
    SDL_FreeSurface(this->image);
}


/**
 * @brief Loads an SDL_Surface.
 * @param surface the Surface to Load.
 * @param target the GL-Target to load the Surface to default GL_TEXTURE_2D
 * @returns true on success, false otherwise.
 */
bool TextureData::loadSurface(SDL_Surface* surface, GLenum target)
{
  if( surface != NULL)
  {
    this->height = surface->h;
    this->width = surface->w;
  }

  if (Texture::getTextureEnableState())
  {
    SDL_Surface* newSurf = Texture::prepareSurface(surface, this->bAlpha);
    if (newSurf != NULL)
    {
      this->setSurface(newSurf);
      this->setTexture(Texture::loadTexToGL(newSurf, target));
      return true;
    }
  }
  return false;
}



/**
 * @brief set the surface this Texture handles
 * @param newSurface the new Surface to set as the image for this Texture.
 * @returns true on success.
 *
 * This deletes the old version of the stored Texture,
 * and sets the newly given Surface as current.
 */
bool TextureData::setSurface(SDL_Surface* newSurface)
{
  if (this->image != NULL)
    SDL_FreeSurface(this->image);

  this->image = newSurface;

  return (this->image != NULL);
}


/**
 * @brief sets a new Texture to the Data.
 * @param texture the Texture
 * @returns true on success.
 */
bool TextureData::setTexture(GLuint texture)
{
     // unload the old Texture.
  if (this->texture != 0 && glIsTexture(this->getTexture()))
  {
    glDeleteTextures(1, &this->texture);
  }
  this->texture = texture;
  return (texture != 0);
}