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/*
 *
 * This file is part of Tulip (www.tulip-software.org)
 *
 * Authors: David Auber and the Tulip development Team
 * from LaBRI, University of Bordeaux
 *
 * Tulip 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.
 *
 * Tulip 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.
 *
 */
///@cond DOXYGEN_HIDDEN

#ifndef Tulip_GLTEXTUREMANAGER_H
#define Tulip_GLTEXTUREMANAGER_H

#include <tulip/tulipconf.h>

#if defined(_MSC_VER)
#include <Windows.h>
#endif

#if defined(__APPLE__)
#include <OpenGL/gl.h>
#else
#include <GL/gl.h>
#endif

#include <set>
#include <map>
#include <string>

#include <stdint.h>

namespace tlp {

struct GlTexture {
  GLuint *id;
  int height;
  int width;
  unsigned int spriteNumber;
};

/**
 *  \brief Class to load textures
 */
class TLP_GL_SCOPE GlTextureLoader {
public:
  /**
   * Load a texture from a file
   * in the default implementation only bmp, jpeg and png files
   * can be loaded.
   * Return false if an error occurs
   */
  virtual bool loadTexture(const std::string& filename, GlTexture& texture);

  virtual ~GlTextureLoader() {}
};

/** \brief Class to manage textures
 * Singleton class to load/store textures need by OpenGL rendering
 */
class TLP_GL_SCOPE GlTextureManager {

  typedef std::map<std::string,GlTexture> TextureUnit;
  typedef std::map<uintptr_t,TextureUnit> ContextAndTextureMap;

public:

  /**
  * Return the texture manager singleton, il singleton doesn't exist this function create it
  */
  static GlTextureManager &getInst() {
    if(!inst)
      inst=new GlTextureManager();

    return *inst;
  }

  /**
   * Change the current OpenGl context (each OpenGl window have a different OpenGl context)
   */
  void changeContext(uintptr_t context);
  /**
   * Remove all textures of an OpenGl context and remove this context
   */
  void removeContext(uintptr_t context);

  /**
   * Return texture info (id, width and height) for the given name
   */
  GlTexture getTextureInfo(const std::string&);

  /**
   * Check if a texture fo the given name exists in the current context
   */
  bool existsTexture(const std::string& filename);
  /**
   * Load texture with given name
   */
  bool loadTexture(const std::string&);
  /**
   * Remove texture with given name
   */
  void deleteTexture(const std::string &);
  /**
   * Begin a new texture with given name
   */
  void beginNewTexture(const std::string&);
  /**
   * Activate a texture with given name
   */
  bool activateTexture(const std::string&,unsigned int);
  /**
   * Activate a texture with given name
   */
  bool activateTexture(const std::string&);
  /**
   * Disable texture with given name
   */
  void desactivateTexture();
  /**
   * Set animationStep for next textures (for next activateTexture)
   */
  void setAnimationFrame(unsigned int id) {
    animationFrame=id;
  }
  /**
   * Get animationStep of next textures
   */
  unsigned int getAnimationFrame() {
    return animationFrame;
  }
  /**
   * Clear vector of textures with error
   */
  void clearErrorVector() {
    texturesWithError.clear();
  }
  /**
   * Remove an entry of vector of textures with error
   */
  void removeEntryOfErrorVector(const std::string &name) {
    texturesWithError.erase(name);
  }


  /**
   * Register an external texture is GlTextureManager
   */
  void registerExternalTexture(const std::string &textureName, const GLuint textureId);

  /**
   * Get Texture loader
   */
  static GlTextureLoader* getTextureLoader() {
    return loader ? loader : (loader = new GlTextureLoader());
  }

  /**
   * Set Texture loader
   */
  static void setTextureLoader(GlTextureLoader* texLoader) {
    if (loader)
      delete loader;

    loader = texLoader;
  }

private:

  /**
   * empty private constructor for singleton
   */
  GlTextureManager();

  static GlTextureManager* inst;
  static GlTextureLoader* loader;

  uintptr_t currentContext;

  ContextAndTextureMap texturesMap;
  std::set<std::string> texturesWithError;

  unsigned int animationFrame;

};

}

#endif // Tulip_GLTEXTUREMANAGER_H
///@endcond