// -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*-
// #ident "$Id: TextureUtil.cpp $"
/***************************************************************************
                          TextureUtil.cpp  -  description
                             -------------------
    begin                : Mon Nov 27 2000
    copyright            : (C) 2000 by Henrik Enqvist
    email                : henqvist@excite.com
***************************************************************************/


// TODO free textures and image memory on exit/clear function
#include "Private.h"
#include "TextureUtil.h"
#include "Config.h"
#include <iostream>

#if EM_USE_SDL
#include <SDL_opengl.h> //should fix GL portability ; instead of <OpenGL/gl.h>
// TODO remove glu
#if EM_DEBUG
#include <GL/glu.h>
#endif
#include <SDL.h>
#include <SDL_image.h>

extern "C" {
  struct_image* loadP(const char * filename);

  struct_image* loadP(const char * filename) {
    SDL_Surface* surface = IMG_Load(filename);
    if (surface == NULL) {
      cerr << "::loadP could not load: " << filename << endl;
      return NULL;
    }
    struct_image* image = (struct_image*) malloc(sizeof(struct_image));
    image->width = surface->w;
    image->height = surface->h;
    // asume 24 bits are 3*8 and 32 are 4*8
    if (surface->format->BitsPerPixel == 24) {
      image->channels = 3;
    } else if (surface->format->BitsPerPixel == 32) {
      image->channels = 4;
    } else {
      cerr << "::loadP Only 32 bit RGBA and 24 bit RGB images supported"<<endl;
      // TODO free surface struct
      free(image);
      return NULL;
    }
    image->pixels = (unsigned char*) surface->pixels;
    return image;
  }
}
#endif // EM_USE_SDLIMAGE

#if EM_USE_ALLEGRO
#include <allegro.h>
BITMAP * backbuffer = NULL;
ZBUFFER * zbuffer = NULL;
#endif // EM_USE_ALLEGRO


TextureUtil* TextureUtil::p_TextureUtil = NULL;

TextureUtil::TextureUtil() {
  m_colClear.r = 0.0f;
  m_colClear.g = 0.0f;
  m_colClear.b = 0.0f;
  m_colClear.a = 0.0f;
}

TextureUtil::~TextureUtil() {
  //freeTextures(); // TODO: check mem leaks here //!rzr
  //EM_COUT("TextureUtil::~TextureUtil",0);
}

TextureUtil* TextureUtil::getInstance() {
  if (p_TextureUtil == NULL) {
    p_TextureUtil = new TextureUtil();
  }
  return p_TextureUtil;
}

//!+rzr : this workaround a WIN32 bug // TODO: check (bugs possible)
void TextureUtil::freeTextures()  {
#if EM_USE_SDL
  //EM_COUT("+ TextureUtil::freeTextures",1);
  map<string,EmTexture*>::iterator i;
  for ( i = m_hEmTexture.begin();
        i != m_hEmTexture.end();
        i++) {
    glDeleteTextures (1, (GLuint*) ((*i).second) ); //is that correct ?
    free((*i).second);  // malloc -> free
    (*i).second = 0;
  }
  m_hEmTexture.clear();
  /// same pointers
  m_hImageName.clear();
#endif    // TODO ALLEGRO
}


// may solve the w32 bug on resize //TODO check it @w32
void TextureUtil::reloadTextures()  {
  //cout<<"+ TextureUtil::reloadTextures"<<endl;
#if EM_USE_SDL
  m_hImageName.clear();
  map<string,EmTexture*>::iterator i;
  for ( i = m_hEmTexture.begin();
        i != m_hEmTexture.end();
        i++) {
    glDeleteTextures (1, (GLuint*) ((*i).second) ); //is that correct ?
    genTexture( (*i).first.c_str() ,  (*i).second  );
    m_hImageName.insert(pair<EmTexture*,string>(  (*i).second, (*i).first ));
  }
#endif    // TODO ALLEGRO
  //EM_CERR("- TextureUtil::reloadTextures");
  //cout<<"- TextureUtil::reloadTextures"<<endl;
}

void TextureUtil::getFilename(list<string> & files) {
  map<EmTexture*,string>::iterator i;
  for ( i = m_hImageName.begin();
        i != m_hImageName.end();
        i++) {
    files.push_back( (*i).second);
  }
}
//!-rzr


void TextureUtil::initGrx() {
  Config * config = Config::getInstance();

#if EM_USE_SDL
  cerr << "Initing SDL" << endl << endl;
  if (SDL_InitSubSystem(SDL_INIT_VIDEO) < 0) {
    cerr << "Couldn't initialize SDL video" << SDL_GetError() << endl;
    exit(1);
  }

  if (SDL_InitSubSystem(SDL_INIT_JOYSTICK) < 0) {
    cerr << "Couldn't initialize SDL joystick: " <<  SDL_GetError() << endl << endl;
  } else {
    int njoystick = SDL_NumJoysticks();
    cerr << njoystick << " joysticks were found." << endl;
    if (njoystick != 0) {
      cerr << "The names of the joysticks are:" << endl;
      for(int a=0; a<njoystick; a++ ) {
        cerr << "  " << SDL_JoystickName(a) << endl;
      }
      cerr << "Using " << SDL_JoystickName(0) << endl << endl;
      SDL_JoystickOpen(0);
      SDL_JoystickEventState(SDL_ENABLE);
    }
  }

  // See if we should detect the display depth
  if ( SDL_GetVideoInfo()->vfmt->BitsPerPixel <= 8 ) {
    SDL_GL_SetAttribute( SDL_GL_RED_SIZE, 2 );
    SDL_GL_SetAttribute( SDL_GL_GREEN_SIZE, 3 );
    SDL_GL_SetAttribute( SDL_GL_BLUE_SIZE, 3 );
  } else        if ( SDL_GetVideoInfo()->vfmt->BitsPerPixel <= 16 ) {
    SDL_GL_SetAttribute( SDL_GL_RED_SIZE, 5 );
    SDL_GL_SetAttribute( SDL_GL_GREEN_SIZE, 5 );
    SDL_GL_SetAttribute( SDL_GL_BLUE_SIZE, 5 );
  }     else {
    SDL_GL_SetAttribute( SDL_GL_RED_SIZE, 8 );
    SDL_GL_SetAttribute( SDL_GL_GREEN_SIZE, 8 );
    SDL_GL_SetAttribute( SDL_GL_BLUE_SIZE, 8 );
  }

  SDL_GL_SetAttribute( SDL_GL_DEPTH_SIZE, 16 );
  SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 );

  /* Initialize the display */
  SDL_Surface* screen =
    SDL_SetVideoMode(config->getWidth(), config->getHeight(), config->getBpp(),
                     SDL_OPENGL
                     | (config->useFullScreen() ? SDL_FULLSCREEN : 0));

  //    if (config->useFullScreen()) {
  SDL_ShowCursor(SDL_DISABLE);
  //    }
  SDL_WM_SetCaption("Emilia Pinball", NULL);

  if (screen == NULL) {
    cerr << "Couldn't set video mode: " << SDL_GetError() << endl;
    exit(1);
  }

  cerr << "Vendor     : " << glGetString( GL_VENDOR ) << endl;
  cerr << "Renderer   : " << glGetString( GL_RENDERER ) << endl;
  cerr << "Version    : " << glGetString( GL_VERSION ) << endl;
  cerr << "Extensions : " << glGetString( GL_EXTENSIONS ) << endl << endl;
  //TODO: that would be usefull to report CPU/RAM specs also //!rzr

  int value;
  SDL_GL_GetAttribute( SDL_GL_RED_SIZE, &value );
  cerr << "SDL_GL_RED_SIZE: " << value << endl;
  SDL_GL_GetAttribute( SDL_GL_GREEN_SIZE, &value );
  cerr << "SDL_GL_GREEN_SIZE: " << value << endl;
  SDL_GL_GetAttribute( SDL_GL_BLUE_SIZE, &value );
  cerr << "SDL_GL_BLUE_SIZE: " << value << endl;
  SDL_GL_GetAttribute( SDL_GL_DEPTH_SIZE, &value );
  cerr << "SDL_GL_DEPTH_SIZE: " << value << endl;
  SDL_GL_GetAttribute( SDL_GL_DOUBLEBUFFER, &value );
  cerr << "SDL_GL_DOUBLEBUFFER: " << value << endl << endl;

  this->resizeView(config->getWidth(), config->getHeight());
#endif // EM_USE_SDL

#if EM_USE_ALLEGRO
  //config->setSize(320, 240);

  allegro_init();
  install_keyboard();
  install_timer();
  install_mouse();

  COLOR_MAP colorMap;
  RGB_MAP rgbMap;
  COLOR_MAP transMap;

  RGB* paPalette = (RGB*) calloc(256, sizeof(RGB));
  generate_332_palette(paPalette);
  // create rgb table
  create_rgb_table(&rgbMap, paPalette, NULL);
  rgb_map = &rgbMap;
  // create light table and setup the truecolor blending functions.
  create_light_table(&colorMap, paPalette, 0, 0, 0, NULL);
  color_map = &colorMap;
  // texture and flat polygons are 50% transparent
  create_trans_table(&transMap, paPalette, 128, 128, 128, NULL);
  set_trans_blender(0, 0, 0, 128);
  // set the graphics mode
  int tc = GFX_AUTODETECT_WINDOWED, tw = config->getWidth();
  int th = config->getHeight(), tbpp = 16;
  /*
    set_gfx_mode(GFX_SAFE, 320, 200, 0, 0);
    set_palette(desktop_palette);

    if (!gfx_mode_select_ex(&tc, &tw, &th, &tbpp)) {
    allegro_exit();
    cerr << "Error setting safe graphics mode" << endl;
    }
  */
  set_color_depth(tbpp);
  if (set_gfx_mode(tc, tw, th, 0, 0) != 0) {
    allegro_exit();
    cerr << "Error setting graphics mode " << endl << allegro_error << endl;
  }
  set_palette(paPalette);
  config->setSize(tw, th);
  set_projection_viewport(0, 0, tw, th);
  // Create back buffer.
  backbuffer = create_bitmap(tw, th);
  clear(backbuffer);
  zbuffer = create_zbuffer(backbuffer);
  set_zbuffer(zbuffer);
  clear_zbuffer(zbuffer, 0);
#endif // EM_USE_ALLEGRO
}

void TextureUtil::stopGrx() {
  cerr << "Stopping graphics...";
#if EM_USE_SDL
  SDL_Quit();
#endif
#if EM_USE_ALLEGRO
  allegro_exit();
#endif
  cerr << "ok." << endl;
}

void TextureUtil::setClearColor(float r, float g, float b, float a) {
  m_colClear.r = r;
  m_colClear.g = g;
  m_colClear.b = b;
  m_colClear.a = a;
#if EM_USE_SDL
  glClearColor(m_colClear.r, m_colClear.g, m_colClear.b, m_colClear.a);
#endif
}

void TextureUtil::resizeView(unsigned int w, unsigned int h) {
#if EM_USE_SDL
  glViewport(0, 0, (GLsizei) w, (GLsizei) h);

  glClearColor(m_colClear.r, m_colClear.g, m_colClear.b, m_colClear.a);
  glClearDepth(1.0);

  glShadeModel(GL_SMOOTH);

  glEnable(GL_CULL_FACE);
  glCullFace(GL_BACK);
  glFrontFace(GL_CW);

  //    glDisable(GL_DITHER);
  glDisable(GL_LIGHTING);

  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();

  float ratio = Config::getInstance()->getRatio();
  if (ratio>=1 || ratio<=0) ratio=1; //TODO

  glFrustum(-EM_RIGHT*EM_NEAR*ratio, EM_RIGHT*EM_NEAR*ratio,
	    -EM_UP*EM_NEAR, EM_UP*EM_NEAR,
            EM_NEAR, EM_FAR);
  glMatrixMode(GL_MODELVIEW);

#if OPENGL_LIGHTS
  glEnable(GL_LIGHTING);
#endif

#endif // EM_USE_SDL
}


EmImage* TextureUtil::loadImage(const char* filename) {
#if EM_USE_SDL
  struct_image * image = loadP(filename);
  if (image == NULL) {
    cerr << "TextureUtil::loadImage unable to load " << filename << endl;
  }
  return image;
#endif // EM_USE_SDL
#if EM_USE_ALLEGRO
  RGB pal[256];
  BITMAP * bm = load_bitmap(filename, pal);
  if (bm == NULL) {
    cerr << "TextareUtil::loadImage unable to load " << filename << " : " << allegro_error << endl;
  }
  return bm;
#endif // EM_USE_ALLEGRO
}
int TextureUtil::genTexture( char const * const filename,
                             EmTexture * const texture)
{
  //cout<<"+ Texture::genTexture : "<<filename<<endl;
  *texture = 0;

#if EM_USE_SDL
  // Load Texture
  struct_image* image = 0;

  // load the texture
  image = loadP(filename);
  if (image == NULL) {
    cerr << "TextureUtil::loadTexture error loading file " << filename << endl;
    return -1;
  }
  //TODO : Pad texture != 2^n x 2^n //!rzr

  //cout<<" Create Texture"<<endl;
  glGenTextures(1, texture);
  glBindTexture(GL_TEXTURE_2D, *texture);


  // 2d texture, level of detail 0 (normal), 3 components (red, green, blue),
  // x size from image, y size from image,
  // border 0 (normal), rgb color data, unsigned byte data,
  // and finally the data itself.x
  GLenum comp;
  switch (image->channels) {
  case 3: comp = GL_RGB; break;
  case 4: comp = GL_RGBA; break;
  default: comp = GL_RGB;
    cerr << "TextureUtil::loadTexture unknown image format" << endl;
    return -1;
  }


  glTexImage2D(GL_TEXTURE_2D, 0, comp, image->width, image->height, 0, comp,
               GL_UNSIGNED_BYTE, image->pixels);

  EM_COUT("loaded texture: " << filename, 1);
  EM_COUT("size " << image->width <<" "<< image->height, 1);
  //    EM_COUT("bytes per pixel " << (int)image->format->BytesPerPixel, 1);
  //    EM_COUT("bits per pixel " << (int)image->format->BitsPerPixel, 1);

#endif
  EM_COUT("- Texture::genTexture : "<<filename<<hex<<texture,0);
  return 1;
}


EmTexture* TextureUtil::loadTexture(const char* filename) {
  EmTexture* texture = 0;
#if EM_USE_SDL
  // look if the texture is already loaded
  if (m_hEmTexture.find(string(filename)) != m_hEmTexture.end()) {
    EM_COUT("TextureUtil::loadTexture found texture "
            << filename << " in cache", 0);
    map<string, EmTexture*>::iterator element
      = m_hEmTexture.find(string(filename));
    return (*element).second;
  }

  texture =  new EmTexture;
  int t = genTexture( filename, texture); //!rzr {
  if ( t < 0 ) { delete texture; return 0; } // could have been written better

  //EM_GLERROR(" In TextureUtil::loadTexture ");
  // insert the texture into the cache
  m_hEmTexture.insert(pair<string, EmTexture*>(string(filename), texture));
  m_hImageName.insert(pair<EmTexture*, string>(texture, string(filename)));
  //cout<<"- TextureUtil::loadTexture"<<endl;
  return texture;
#endif // EM_USE_SDL
#if EM_USE_ALLEGRO
  RGB pal[256];
  BITMAP * bm = load_bitmap(filename, pal);
  if (bm == NULL) {
    cerr << "TextureUtil::loadTexture Unable to load "
         << filename << " : " << allegro_error << endl;
  }
  return bm;
#endif // EM_USE_ALLEGRO
  return texture;
}

const char * TextureUtil::getTextureName(EmTexture * tex) {
  map<EmTexture*, string>::iterator element = m_hImageName.find(tex);
  if (element != m_hImageName.end()) {
    return (*element).second.c_str();
  }
  cerr << "TextureUtil::getTextureName could not find image name" << endl;
  return NULL;
}
/*
  void TextureUtil::load(list<string> & files)
  {
  list<string>::iterator is = files.begin();
  for ( ; is != files.end() ; is++ )
  loadTexture( (*is).c_str() );
  }
*/

// #eof "$Id: TextureUtil.cpp $