I am receiving an screen-shot Palette over the network. Next, I convert the Palette indices to their relevant RGB using my matrix containing different colors.
The problem I have with the code is I cannot create a texture out of this rgb image I receive successfully. I would thank if you inform me if I am making a mistake anywhere in the code.

Qt Code: 
  1. void GlWidget::createTextureFromBitmap(QByteArray btmp)
  2. {
  3.     //==============================================
  4.     //********** currently using ***************
  5.     //==============================================
  6.     bytes.clear();
  7.     bytes.resize(size * sizeof(unsigned char) * 3);
  8.     bytes = btmp;
  9.     int iRow = 0, iCol = 0;
  10.     for(int i = 2; i < 800*600; i++)
  11.     {
  12.         iCol = i % 800;
  13.         iRow = i / 800;
  14.  
  15.         bytes[(800-iCol)*1800 + 3 * iRow    ] = rgbPaletteSystem[btmp[i]][0] ;
  16.         bytes[(800-iCol)*1800 + 3 * iRow - 1] = rgbPaletteSystem[btmp[i]][2] ;
  17.         bytes[(800-iCol)*1800 + 3 * iRow - 2] = rgbPaletteSystem[btmp[i]][1];
  18.     }
  19.     //    updateGL();
  20.     //==============================================
  21.     //********** currently using ***************
  22.     //==============================================
  23.  
  24.  
  25.      //==========================================
  26.      //********** creating texture *********
  27.      //=====================================
  28.     /* create a 800 bye 600 texture from bitmap */
  29.     tex.buf = new unsigned char[bytes.size()];
  30.     memcpy(tex.buf, bytes.constData(), bytes.size());
  31.     glGenTextures( 1, &tex.id);
  32.     glBindTexture(GL_TEXTURE_2D, tex.id);
  33.     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
  34.     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
  35.     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER,GL_LINEAR);
  36.     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,GL_LINEAR_MIPMAP_LINEAR);
  37.     glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
  38.     glTexImage2D(     GL_TEXTURE_2D, 0, GL_RGB, 0, 0, 0, GL_RGB, GL_3_BYTES, tex.buf);
  39.     gluBuild2DMipmaps(GL_TEXTURE_2D, GL_RGB, 800, 600, GL_RGB, GL_3_BYTES, tex.buf);
  40.     delete [] tex.buf;
  41.     tex.buf = NULL;
  42.     updateGL();
  43. }
  44.  
  45. void GlWidget::paintGL()
  46. {
  47.     QMatrix4x4 mMatrix;
  48.     QMatrix4x4 vMatrix;
  49.  
  50.     QMatrix4x4 cameraTransformation;
  51.     cameraTransformation.rotate(alpha, 0, 1, 0);
  52.     cameraTransformation.rotate(beta, 1, 0, 0);
  53.  
  54.     QVector3D cameraPosition = cameraTransformation * QVector3D(0, 0, distance);
  55.     QVector3D cameraUpDirection = cameraTransformation * QVector3D(0, 1, 0);
  56.  
  57.     vMatrix.lookAt(cameraPosition, QVector3D(0, 0, 0), cameraUpDirection);
  58.  
  59.     //    //! [6]
  60.     shaderProgram.bind();
  61.     shaderProgram.setUniformValue("mvpMatrix", pMatrix * vMatrix * mMatrix);
  62.     shaderProgram.setUniformValue("texture", 0);
  63.  
  64.     glActiveTexture(GL_TEXTURE0);
  65.     glBindTexture(GL_TEXTURE_2D, tex.id);
  66.     glActiveTexture(0);
  67.  
  68.     shaderProgram.setAttributeArray("vertex", vertices.constData());
  69.     shaderProgram.enableAttributeArray("vertex");
  70.     shaderProgram.setAttributeArray("textureCoordinate", textureCoordinates.constData());
  71.     shaderProgram.enableAttributeArray("textureCoordinate");
  72.  
  73.     glDrawArrays(GL_TRIANGLES, 0, vertices.size());
  74.  
  75.     shaderProgram.disableAttributeArray("vertex");
  76.     shaderProgram.disableAttributeArray("textureCoordinate");
  77.     shaderProgram.release();
  78. }
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