source: orxonox.OLD/orxonox/branches/images/importer/material.cc @ 3108

/* 
   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: ...

   TGA-code: borrowed from nehe-Tutorials

   ToDo: free SDL-surface when deleting Material.
*/

#include "material.h"


/**
   \brief creates a default Material with no Name
   normally you call this to create a material List (for an obj-file) and then append with addMaterial()
*/
Material::Material()
{
  init();
  
  setName ("");
}

/**
   \brief creates a Material.
   \param mtlName Name of the Material to be added to the Material List
*/
Material::Material (char* mtlName)
{
  init();
  
  setName (mtlName);
}

/** 
    \brief deletes a Material
*/
Material::~Material()
{
  if (name)
    delete []name;
  if (diffuseTextureSet)
    glDeleteTextures (1, &diffuseTexture);
  if (verbose >= 2)
    printf ("delete Material %s.\n", name);
  if (nextMat != NULL)
    delete nextMat;
}

/**
   \brief adds a new Material to the List.
   this Function will append a new Material to the end of a Material List.
   \param mtlName The name of the Material to be added.
*/
Material* Material::addMaterial(char* mtlName)
{
  if (verbose >=2)
    printf ("adding Material %s.\n", mtlName);
  Material* newMat = new Material(mtlName);
  Material* tmpMat = this;
  while (tmpMat->nextMat != NULL)
    {
      tmpMat = tmpMat->nextMat;
    }
  tmpMat->nextMat = newMat;
  return newMat;
  
}

/**
   \brief initializes a new Material with its default Values
*/
void Material::init(void)
{
  if (verbose >= 3)
    printf ("initializing new Material.\n");
  nextMat = NULL;

  setIllum(1);
  setDiffuse(0,0,0);
  setAmbient(0,0,0);
  setSpecular(.5,.5,.5);
  setShininess(2.0);
  setTransparency(0.0);

  diffuseTextureSet = false;
  ambientTextureSet = false;
  specularTextureSet = false;

  
}

/**
   \brief Search for a Material called mtlName
   \param mtlName the Name of the Material to search for
   \returns Material named mtlName if it is found. NULL otherwise.
*/
Material* Material::search (char* mtlName)
{
  if (verbose >=3)
    printf ("Searching for material %s", mtlName);
  Material* searcher = this;
  while (searcher != NULL)
    {
      if (verbose >= 3)
        printf (".");
      if (!strcmp (searcher->getName(), mtlName))
        {
          if (verbose >= 3)
            printf ("found.\n");
          return searcher;
        }
      searcher = searcher->nextMat;
    }
  if (verbose >=3)
    printf ("not found\n");
  return NULL;
}

/**
   \brief sets the material with which the following Faces will be painted
*/
bool Material::select (void)
{
  // setting diffuse color
  //  glColor3f (diffuse[0], diffuse[1], diffuse[2]);
  glMaterialfv(GL_FRONT, GL_DIFFUSE, diffuse);

  // setting ambient color
  glMaterialfv(GL_FRONT, GL_AMBIENT, ambient);

  // setting up Sprecular
  glMaterialfv(GL_FRONT, GL_SPECULAR, specular);

  // setting up Shininess
  glMaterialf(GL_FRONT, GL_SHININESS, shininess);
  
  // setting illumination Model 
  if (illumModel == 1)
    glShadeModel(GL_FLAT);
  else if (illumModel >= 2)
    glShadeModel(GL_SMOOTH);

  if (diffuseTextureSet)
    glBindTexture(GL_TEXTURE_2D, diffuseTexture);
  else
    glBindTexture(GL_TEXTURE_2D, 0);
  
}


/**
   \brief Set the Name of the Material. (Important for searching)
   \param mtlName the Name of the Material to be set.
*/ 
void Material::setName (char* mtlName)
{
  if (verbose >= 3)
    printf("setting Material Name to %s.\n", mtlName);
  name = new char [strlen(mtlName)];
  strcpy(name, mtlName);
  //  printf ("adding new Material: %s, %p\n", this->getName(), this);

}
/**
   \returns The Name of The Material
*/
char* Material::getName (void)
{
  return name;
}

/**
   \brief Sets the Material Illumination Model. 
   \brief illu illumination Model in int form
*/
void Material::setIllum (int illum)
{
  if (verbose >= 3)
    printf("setting illumModel of Material %s to %i", name, illum);
  illumModel = illum;
  //  printf ("setting illumModel to: %i\n", illumModel);
}
/**
   \brief Sets the Material Illumination Model. 
   \brief illu illumination Model in char* form
*/void Material::setIllum (char* illum)
{
  setIllum (atoi(illum));
}

/**
   \brief Sets the Material Diffuse Color.
   \param r Red Color Channel.
   \param g Green Color Channel.
   \param b Blue Color Channel.
*/
void Material::setDiffuse (float r, float g, float b)
{
  if (verbose >= 3)
    printf ("setting Diffuse Color of Material %s to r=%f g=%f b=%f.\n", name, r, g, b);
  diffuse[0] = r;
  diffuse[1] = g;
  diffuse[2] = b;  
  diffuse[3] = 1.0;

}
/**
   \brief Sets the Material Diffuse Color.
   \param rgb The red, green, blue channel in char format (with spaces between them)
*/
void Material::setDiffuse (char* rgb)
{
  char r[20],g[20],b[20];
  sscanf (rgb, "%s %s %s", r, g, b);
  setDiffuse (atof(r), atof(g), atof(b));
}

/**
   \brief Sets the Material Ambient Color. 
   \param r Red Color Channel.
   \param g Green Color Channel.
   \param b Blue Color Channel.
*/
void Material::setAmbient (float r, float g, float b)
{
  if (verbose >=3)
    printf ("setting Ambient Color of Material %s to r=%f g=%f b=%f.\n", name, r, g, b);
  ambient[0] = r;
  ambient[1] = g;
  ambient[2] = b;
  ambient[3] = 1.0;
}
/**
   \brief Sets the Material Ambient Color.
   \param rgb The red, green, blue channel in char format (with spaces between them)
*/
void Material::setAmbient (char* rgb)
{
  char r[20],g[20],b[20];
  sscanf (rgb, "%s %s %s", r, g, b);
  setAmbient (atof(r), atof(g), atof(b));
}

/**
   \brief Sets the Material Specular Color. 
   \param r Red Color Channel.
   \param g Green Color Channel.
   \param b Blue Color Channel.
*/
void Material::setSpecular (float r, float g, float b)
{
  if (verbose >= 3)
    printf ("setting Specular Color of Material %s to r=%f g=%f b=%f.\n", name, r, g, b);
  specular[0] = r;
  specular[1] = g;
  specular[2] = b;
  specular[3] = 1.0;
 }
/**
   \brief Sets the Material Specular Color.
   \param rgb The red, green, blue channel in char format (with spaces between them)
*/
void Material::setSpecular (char* rgb)
{
  char r[20],g[20],b[20];
  sscanf (rgb, "%s %s %s", r, g, b);
  setSpecular (atof(r), atof(g), atof(b));
}

/**
   \brief Sets the Material Shininess.
   \param shini stes the Shininess from float.
*/
void Material::setShininess (float shini)
{
  shininess = shini;
}
/**
   \brief Sets the Material Shininess.
   \param shini stes the Shininess from char*.
*/
void Material::setShininess (char* shini)
{
  setShininess (atof(shini));
}

/**
   \brief Sets the Material Transparency.
   \param trans stes the Transparency from int.
*/
void Material::setTransparency (float trans)
{
  if (verbose >= 3)
    printf ("setting Transparency of Material %s to %f.\n", name, trans);
  transparency = trans;
}
/**
   \brief Sets the Material Transparency.
   \param trans stes the Transparency from char*.
*/
void Material::setTransparency (char* trans)
{
  char tr[20];
  sscanf (trans, "%s", tr);
  setTransparency (atof(tr));
}

// MAPPING //

/**
   \brief Sets the Materials Diffuse Map
   \param dMap the Name of the Image to Use
*/
void Material::setDiffuseMap(char* dMap)
{
  if (verbose>=2)
    printf ("setting Diffuse Map %s\n", dMap);

  //  diffuseTextureSet = loadBMP(dMap, &diffuseTexture);
  diffuseTextureSet = loadImage(dMap, &diffuseTexture);

}

/**
   \brief Sets the Materials Ambient Map
   \param aMap the Name of the Image to Use
*/
void Material::setAmbientMap(char* aMap)
{
  SDL_Surface* ambientMap;

}

/**
   \brief Sets the Materials Specular Map
   \param sMap the Name of the Image to Use
*/
void Material::setSpecularMap(char* sMap)
{
  SDL_Surface* specularMap;

}

/**
   \brief Sets the Materials Bumpiness
   \param bump the Name of the Image to Use
*/
void Material::setBump(char* bump)
{

}

bool Material::loadTexToGL (Image* pImage, GLuint* texture)
{
  glGenTextures(1, texture);
  glBindTexture(GL_TEXTURE_2D, *texture);
  /* not Working, and not needed. 
  glTexImage2D( GL_TEXTURE_2D, 0, 3, width,
                height, 0, GL_BGR,
                GL_UNSIGNED_BYTE, map->pixels );
  */ 
  gluBuild2DMipmaps(GL_TEXTURE_2D, 3, pImage->width, pImage->height, GL_RGB, GL_UNSIGNED_BYTE, pImage->data);
  
  glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR_MIPMAP_NEAREST);
  glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR_MIPMAP_LINEAR); 
}


#ifdef HAVE_SDL_SDL_IMAGE_H
bool Material::loadImage(char* imageName, GLuint* texture)
{
  SDL_Surface* map;
  Image* pImage = new Image;
  map=IMG_Load(imageName);
  if(!map)
    {
      printf("IMG_Load: %s\n", IMG_GetError());
    }
  pImage->height = map->h;
  pImage->width  = map->w;
  pImage->data   = (GLubyte*)map->pixels;
  if( !IMG_isPNG(SDL_RWFromFile(imageName, "rb")) && !IMG_isJPG(SDL_RWFromFile(imageName, "rb")))
    for (int i=0;i<map->h * map->w *3;i+=3)
      { 
        GLuint temp = pImage->data[i];
        pImage->data[i] = pImage->data[i+2];
        pImage->data[i+2] = temp;
      }
  loadTexToGL (pImage, texture);

}
#else
/**
   \brief Makes the Programm ready to Read-in a texture-File
   1. Checks what type of Image should be imported
   2. ToDO: Checks where to find the Image
*/
bool Material::loadImage(char* imageName, GLuint* texture)
{
  if (!strncmp(imageName+strlen(imageName)-4, ".bmp", 4))
    {
      if (verbose >=2)
        printf ("Requested bmp-image. Trying to Import.\n");
      return loadBMP(imageName, texture);
    }

  else if (!strncmp(imageName+strlen(imageName)-4, ".jpg", 4) || !strncmp(imageName+strlen(imageName)-5, ".jpg", 5))
    {
      if (verbose >=2)
        printf ("Requested jpeg-image. Trying to Import\n");
      return loadJPG(imageName, texture);
    }
  else if (!strncmp(imageName+strlen(imageName)-4, ".tga", 4))
    {
      if (verbose >=2)
        printf ("Requested tga-image. Trying to Import\n");
      return loadTGA(imageName, texture);
    }
  else if (!strncmp(imageName+strlen(imageName)-4, ".png", 4))
    {
      if (verbose >=2)
        printf ("Requested png-image. Trying to Import\n");
      return loadPNG(imageName, texture);
    }
  else
    {
      if (verbose >=1)
        printf ("Requested Image was not recognized in its type. (Maybe a type-Cast-error.)\n FileName: %s", imageName);
      return false;
    }

}

/**
   \brief reads in a Windows BMP-file, and imports it to openGL.
   \param bmpName The name of the Image to load.
   \param texture A pointer to the Texture which should be read to.
*/
bool Material::loadBMP (char* bmpName, GLuint* texture)
{
  Image* pImage = new Image;
  FILE *file;
  unsigned long size;                 // size of the image in bytes.
  unsigned long i;                    // standard counter.
  unsigned short int planes;          // number of planes in image (must be 1) 
  unsigned short int bpp;             // number of bits per pixel (must be 24)
  GLuint temp;                          // temporary color storage for bgr-rgb conversion.

  // make sure the file is there.
  if ((file = fopen(bmpName, "rb"))==NULL)
    {
      if (verbose >=1)
        printf("File Not Found : %s\n",bmpName);
      return false;
    }
  // seek through the bmp header, up to the width/height:
  fseek(file, 18, SEEK_CUR);
  
  // read the width
  if ((i = fread(&pImage->width, 4, 1, file)) != 1) 
    {
      if (verbose >=1)
        printf("Error reading width from %s.\n", bmpName);
      return false;
    }
  // read the height 
  if ((i = fread(&pImage->height, 4, 1, file)) != 1) 
    {
      if (verbose>=1)
        printf("Error reading height from %s.\n", bmpName);
      return false;
    }
  
  // calculate the size (assuming 24 bits or 3 bytes per pixel).
  size = pImage->width * pImage->height * 3;
  
  // read the planes
  if ((fread(&planes, 2, 1, file)) != 1) 
    {
      if (verbose>=1)
        printf("Error reading planes from %s.\n", bmpName);
      return false;
    }
  if (planes != 1) 
    {
      if (verbose>=1)
        printf("Planes from %s is not 1: %u\n", bmpName, planes);
      return false;
    }
  
  // read the bpp
  if ((i = fread(&bpp, 2, 1, file)) != 1) 
    {
      if (verbose>=1)
        printf("Error reading bpp from %s.\n", bmpName);
      return false;
    }
  if (bpp != 24) 
    {
      if (verbose>=1)
        printf("Bpp from %s is not 24: %u\n", bmpName, bpp);
      return false;
    }
  
  // seek past the rest of the bitmap header.
  fseek(file, 24, SEEK_CUR);
  
  // read the data. 
  pImage->data = (GLubyte *) malloc(size);
  if (pImage->data == NULL) 
    {
      if (verbose>=1)
        printf("Error allocating memory for color-corrected image data");
      return false;     
    }
  
  if ((i = fread(pImage->data, size, 1, file)) != 1) 
    {
      if (verbose>=1)
        printf("Error reading image data from %s.\n", bmpName);
      return false;
    }
  fclose(file);

  // reverse all of the colors. (bgr -> rgb)
  for (i=0;i<size;i+=3) 
    { 
      temp = pImage->data[i];
      pImage->data[i] = pImage->data[i+2];
      pImage->data[i+2] = temp;
    }
  loadTexToGL (pImage, texture);
  
  return true;

  if (pImage)
    {
      if (pImage->data)
        {
          free(pImage->data);
        }
      
      free(pImage);
    }

}

/**
   \brief reads in a jpg-file
   \param jpgName the Name of the Image to load
   \param texture a reference to the Texture to write the image to
*/
bool Material::loadJPG (char* jpgName, GLuint* texture)
{
  struct jpeg_decompress_struct cinfo;
  Image *pImage = NULL;
  FILE *pFile;
  
  // Open a file pointer to the jpeg file and check if it was found and opened 
  if((pFile = fopen(jpgName, "rb")) == NULL) 
    {
      // Display an error message saying the file was not found, then return NULL
      printf("Unable to load JPG File %s.\n", jpgName);
      return false;
    }
  
  // Create an error handler
  jpeg_error_mgr jerr;
  
  // Have our compression info object point to the error handler address
  cinfo.err = jpeg_std_error(&jerr);
  
  // Initialize the decompression object
  jpeg_create_decompress(&cinfo);
  
  // Specify the data source (Our file pointer) 
  jpeg_stdio_src(&cinfo, pFile);
  
  // Allocate the structure that will hold our eventual jpeg data (must free it!)
  pImage = (Image*)malloc(sizeof(Image));
  
  // DECOFING
  // Read in the header of the jpeg file
  jpeg_read_header(&cinfo, TRUE);
  
  // Start to decompress the jpeg file with our compression info
  jpeg_start_decompress(&cinfo);
  
  // Get the image dimensions and row span to read in the pixel data
  pImage->rowSpan = cinfo.image_width * cinfo.num_components;
  pImage->width   = cinfo.image_width;
  pImage->height   = cinfo.image_height;
  
  // Allocate memory for the pixel buffer
  pImage->data = new unsigned char[pImage->rowSpan * pImage->height];
  
  // Here we use the library's state variable cinfo.output_scanline as the
  // loop counter, so that we don't have to keep track ourselves.
  
  // Create an array of row pointers
  unsigned char** rowPtr = new unsigned char*[pImage->height];
  for (int i = 0; i < pImage->height; i++)
    rowPtr[i] = &(pImage->data[i*pImage->rowSpan]);
  
  // Now comes the juice of our work, here we extract all the pixel data
  int rowsRead = 0;
  while (cinfo.output_scanline < cinfo.output_height) 
    {
      // Read in the current row of pixels and increase the rowsRead count
      rowsRead += jpeg_read_scanlines(&cinfo, &rowPtr[rowsRead], cinfo.output_height - rowsRead);
    }
  
  // Delete the temporary row pointers
  delete [] rowPtr;
  
  // Finish decompressing the data
  jpeg_finish_decompress(&cinfo);//  decodeJPG(&cinfo, pImage);
  
  // This releases all the stored memory for reading and decoding the jpeg
  jpeg_destroy_decompress(&cinfo);
  
  // Close the file pointer that opened the file
  fclose(pFile);
  

  if(pImage == NULL)
    exit(0);
  
  loadTexToGL (pImage, texture);
  if (pImage)
    {
      if (pImage->data)
        {
          free(pImage->data);
        }
      
      free(pImage);
    }
  return true;
}

/**
   \brief reads in a tga-file
   \param tgaName the Name of the Image to load
   \param texture a reference to the Texture to write the image to
*/
bool Material::loadTGA(const char * tgaName, GLuint* texture)
{
  typedef struct
  {
    GLubyte Header[12];
  } TGAHeader;
  TGAHeader tgaHeader;                  
  
  GLubyte uTGAcompare[12] = {0,0,2, 0,0,0,0,0,0,0,0,0}; // Uncompressed TGA Header 
  GLubyte cTGAcompare[12] = {0,0,10,0,0,0,0,0,0,0,0,0}; // Compressed TGA Header 
  FILE * fTGA;
  fTGA = fopen(tgaName, "rb");

  if(fTGA == NULL)
    {
      printf("Error could not open texture file: %s\n", tgaName);
      return false;
    }
  
  if(fread(&tgaHeader, sizeof(TGAHeader), 1, fTGA) == 0)
    {
      printf("Error could not read file header of %s\n", tgaName);
      if(fTGA != NULL)
        {
          fclose(fTGA);
        }
      return false;
    }
  
  if(memcmp(uTGAcompare, &tgaHeader, sizeof(TGAHeader)) == 0)
    {
      loadUncompressedTGA(tgaName, fTGA, texture);
      if (fTGA)
        fclose (fTGA);
    }
  else if(memcmp(cTGAcompare, &tgaHeader, sizeof(TGAHeader)) == 0)
    {
      loadCompressedTGA(tgaName, fTGA, texture);
        if (fTGA)
          fclose (fTGA);
    }
  else
    {
      printf("Error TGA file be type 2 or type 10\n");
      if (fTGA)
        fclose(fTGA);
      return false;
    }
  return true;
}

/**
   \brief reads in an uncompressed tga-file
   \param filename the Name of the Image to load
   \param fTGA a Pointer to a File, that should be read
   \param texture a reference to the Texture to write the image to
*/
bool Material::loadUncompressedTGA(const char * filename, FILE * fTGA, GLuint* texture)
{
  GLubyte header[6];      // First 6 Useful Bytes From The Header 
  GLuint  bytesPerPixel;  // Holds Number Of Bytes Per Pixel Used In The TGA File 
  GLuint  imageSize;      // Used To Store The Image Size When Setting Aside Ram 
  GLuint  temp;           // Temporary Variable
  GLuint  type;
  GLuint  Height;         // Height of Image 
  GLuint  Width;          // Width of Image 
  GLuint  Bpp;            // Bits Per Pixel 

  Image* pImage = new Image;
  GLuint cswap;
  if(fread(header, sizeof(header), 1, fTGA) == 0)
    {
      printf("Error could not read info header\n");
      return false;
    }
  
  Width = pImage->width  = header[1] * 256 + header[0];
  Height =  pImage->height = header[3] * 256 + header[2];
  Bpp = pImage->bpp = header[4];
  // Make sure all information is valid
  if((pImage->width <= 0) || (pImage->height <= 0) || ((pImage->bpp != 24) && (pImage->bpp !=32)))
    {
      printf("Error invalid texture information\n");
      return false;
    }
  
  if(pImage->bpp == 24) 
    {
      pImage->type = GL_RGB;
    }
  else
    {
      pImage->type = GL_RGBA;
    }
  
  bytesPerPixel = (Bpp / 8);
  imageSize = (bytesPerPixel * Width * Height);
  pImage->data = (GLubyte*) malloc(imageSize);
  
  if(pImage->data == NULL)
    {
      printf("Error could not allocate memory for image\n");
      return false;
    }
  
  if(fread(pImage->data, 1, imageSize, fTGA) != imageSize)
    {
      printf("Error could not read image data\n");
      if(pImage->data != NULL)
        {
          free(pImage->data);
        }
      return false;
    }
  
  for(cswap = 0; cswap < (int)imageSize; cswap += bytesPerPixel)
    {
      pImage->data[cswap] ^= pImage->data[cswap+2] ^=
        pImage->data[cswap] ^= pImage->data[cswap+2];
    }
  
  loadTexToGL (pImage, texture);

  return true;
}

/**
   \brief reads in a compressed tga-file
   \param filename the Name of the Image to load
   \param fTGA a Pointer to a File, that should be read
   \param texture a reference to the Texture to write the image to
*/
bool Material::loadCompressedTGA(const char * filename, FILE * fTGA, GLuint* texture)
{
  GLubyte header[6];      // First 6 Useful Bytes From The Header 
  GLuint  bytesPerPixel;  // Holds Number Of Bytes Per Pixel Used In The TGA File 
  GLuint  imageSize;      // Used To Store The Image Size When Setting Aside Ram 
  GLuint  temp;           // Temporary Variable
  GLuint  type;
  GLuint  Height;         // Height of Image 
  GLuint  Width;          // Width of Image 
  GLuint  Bpp;            // Bits Per Pixel 

  Image* pImage = new Image;

  
  if(fread(header, sizeof(header), 1, fTGA) == 0)
    {
      printf("Error could not read info header\n");
      return false;
    }
  
  Width = pImage->width  = header[1] * 256 + header[0];
  Height = pImage->height = header[3] * 256 + header[2];
  Bpp = pImage->bpp     = header[4];

  GLuint pixelcount     = Height * Width;
  GLuint currentpixel   = 0;
  GLuint currentbyte    = 0;
  GLubyte * colorbuffer = (GLubyte *)malloc(bytesPerPixel);

  //Make sure all pImage info is ok 
  if((pImage->width <= 0) || (pImage->height <= 0) || ((pImage->bpp != 24) && (pImage->bpp !=32)))
    {
      printf("Error Invalid pImage information\n");
      return false;
    }
  
  bytesPerPixel = (Bpp / 8);
  imageSize             = (bytesPerPixel * Width * Height);
  pImage->data  = (GLubyte*) malloc(imageSize);
  
  if(pImage->data == NULL)
    {
      printf("Error could not allocate memory for image\n");
      return false;
    }
  
  do
    {
      GLubyte chunkheader = 0;
      
      if(fread(&chunkheader, sizeof(GLubyte), 1, fTGA) == 0)
        {
          printf("Error could not read RLE header\n");
          if(pImage->data != NULL)
            {
              free(pImage->data);
            }
          return false;
        }
      // If the ehader is < 128, it means the that is the number of RAW color packets minus 1 
      if(chunkheader < 128)
        {
          short counter;
          chunkheader++;
          // Read RAW color values
          for(counter = 0; counter < chunkheader; counter++)
            { 
              // Try to read 1 pixel 
              if(fread(colorbuffer, 1, bytesPerPixel, fTGA) != bytesPerPixel)
                {
                  printf("Error could not read image data\n");
                  if(colorbuffer != NULL)
                    {
                      free(colorbuffer);
                    }
                  
                  if(pImage->data != NULL)
                    {
                      free(pImage->data);
                    }
                  
                  return false; 
                }
              // write to memory 
              // Flip R and B vcolor values around in the process 
              pImage->data[currentbyte    ] = colorbuffer[2];                               
              pImage->data[currentbyte + 1] = colorbuffer[1];
              pImage->data[currentbyte + 2] = colorbuffer[0];
              
              if(bytesPerPixel == 4) // if its a 32 bpp image 
                {
                  pImage->data[currentbyte + 3] = colorbuffer[3];// copy the 4th byte 
                }
              
              currentbyte += bytesPerPixel;
              currentpixel++;

              // Make sure we haven't read too many pixels 
              if(currentpixel > pixelcount)     
                {
                  printf("Error too many pixels read\n");
                  if(colorbuffer != NULL)
                    {
                      free(colorbuffer);
                    }
                  
                  if(pImage->data != NULL)
                    {
                      free(pImage->data);
                    }
                  
                  return false;
                }
            }
        }
      // chunkheader > 128 RLE data, next color  reapeated chunkheader - 127 times
      else
        {
          short counter;
          chunkheader -= 127;   // Subteact 127 to get rid of the ID bit 
          if(fread(colorbuffer, 1, bytesPerPixel, fTGA) != bytesPerPixel) // Attempt to read following color values 
            {
              printf("Error could not read from file");
              if(colorbuffer != NULL)
                {
                  free(colorbuffer);
                }
              
              if(pImage->data != NULL)
                {
                  free(pImage->data);
                }
              
              return false;
            }
          
          for(counter = 0; counter < chunkheader; counter++) //copy the color into the image data as many times as dictated
            {                                                   
              // switch R and B bytes areound while copying
              pImage->data[currentbyte    ] = colorbuffer[2];
              pImage->data[currentbyte + 1] = colorbuffer[1];
              pImage->data[currentbyte + 2] = colorbuffer[0];
              
              if(bytesPerPixel == 4)
                {
                  pImage->data[currentbyte + 3] = colorbuffer[3];
                }
              
              currentbyte += bytesPerPixel;
              currentpixel++;
              
              if(currentpixel > pixelcount)
                {
                  printf("Error too many pixels read\n");
                  if(colorbuffer != NULL)
                    {
                      free(colorbuffer);
                    }
                  
                  if(pImage->data != NULL)
                    {
                      free(pImage->data);
                    }
                  
                  return false;
                }
            }
        }
    }
  
  while(currentpixel < pixelcount);     // Loop while there are still pixels left

  loadTexToGL (pImage, texture);

  return true;
}


/*
static int ST_is_power_of_two(unsigned int number)
{
  return (number & (number - 1)) == 0;
}
*/

/**
   \brief reads in a png-file
   \param pngName the Name of the Image to load
   \param texture a reference to the Texture to write the image to
*/
bool Material::loadPNG(const char* pngName, GLuint* texture)
{
  Image* pImage = new Image;

  FILE *PNG_file = fopen(pngName, "rb");
  if (PNG_file == NULL)
    {
      return 0;
    }
  
  GLubyte PNG_header[8];
  
  fread(PNG_header, 1, 8, PNG_file);
  if (png_sig_cmp(PNG_header, 0, 8) != 0)
    {
      if (verbose >=2)
        printf ("Not Recognized as a pngFile\n");
      fclose (PNG_file);
      return 0;
    }
  
  png_structp PNG_reader = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
  if (PNG_reader == NULL)
    {
      fclose(PNG_file);
      return 0;
    }
  
  png_infop PNG_info = png_create_info_struct(PNG_reader);
  if (PNG_info == NULL)
    {
      png_destroy_read_struct(&PNG_reader, NULL, NULL);
      fclose(PNG_file);
      return 0;
    }
  
  png_infop PNG_end_info = png_create_info_struct(PNG_reader);
  if (PNG_end_info == NULL)
    {
      png_destroy_read_struct(&PNG_reader, &PNG_info, NULL);
      fclose(PNG_file);
      return 0;
    }
  
  if (setjmp(png_jmpbuf(PNG_reader)))
    {
      png_destroy_read_struct(&PNG_reader, &PNG_info, &PNG_end_info);
      fclose(PNG_file);
      return (0);
    }
  
  png_init_io(PNG_reader, PNG_file);
  png_set_sig_bytes(PNG_reader, 8);
  
  png_read_info(PNG_reader, PNG_info);
  
  pImage->width = png_get_image_width(PNG_reader, PNG_info);
  pImage->height = png_get_image_height(PNG_reader, PNG_info);
  
  png_uint_32 bit_depth, color_type;
  bit_depth = png_get_bit_depth(PNG_reader, PNG_info);
  color_type = png_get_color_type(PNG_reader, PNG_info);
  
  if (color_type == PNG_COLOR_TYPE_PALETTE)
    {
      png_set_palette_to_rgb(PNG_reader);
    }
  
  if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
    {
      png_set_gray_1_2_4_to_8(PNG_reader);
    }
  
  if (color_type == PNG_COLOR_TYPE_GRAY || color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
    {
      png_set_gray_to_rgb(PNG_reader);
    }
  
  if (png_get_valid(PNG_reader, PNG_info, PNG_INFO_tRNS))
    {
      png_set_tRNS_to_alpha(PNG_reader);
    }
  else
    {
      png_set_filler(PNG_reader, 0xff, PNG_FILLER_AFTER);
    }
  
  if (bit_depth == 16)
    {
      png_set_strip_16(PNG_reader);
    }
  
  png_read_update_info(PNG_reader, PNG_info);
  
  pImage->data = (png_byte*)malloc(4 * pImage->width * pImage->height);
  png_byte** PNG_rows = (png_byte**)malloc(pImage->height * sizeof(png_byte*));
  
  unsigned int row;
  for (row = 0; row < pImage->height; ++row)
    {
      PNG_rows[pImage->height - 1 - row] = pImage->data + (row * 4 * pImage->width);
    }
  
  png_read_image(PNG_reader, PNG_rows);
  
  free(PNG_rows);
  
  png_destroy_read_struct(&PNG_reader, &PNG_info, &PNG_end_info);
  fclose(PNG_file);
  
  /*  if (!ST_is_power_of_two(pImage->width) || !ST_is_power_of_two(pImage->height))
    {
      free(pImage->data);
      return 0;
    }
  */
  loadTexToGL (pImage, texture);  
  
  free(pImage->data);
  
  return true;
}

#endif /* HAVE_SDL_SDL_IMAGE_H */