I try to make a wall of pictures (no overlapping).
For this case I made simple proof of concept example code, but I encounterd one major drawback:
This solution renders ONLY the last texture and replaces all previuosly loaded ons with that one.
(Code compiles just fine)

Qt Code: 
  1. #include <QtCore>
  2. #include <QImage>
  3. #include <QApplication>
  4. #include <QtOpenGL>
  5. #include <QtDebug>
  6.  
  7. class Tile {
  8. public:
  9.     Tile(GLfloat x, GLfloat y, QString path) : gl_x(x), gl_y(y) {
  10.         QImage t;
  11.         QImage b;
  12.         b.load(path);
  13.         t = QGLWidget::convertToGLFormat( b );
  14.         glGenTextures( 1, &texid );
  15.         qDebug() << "texid tile = " << texid;
  16.         glBindTexture( GL_TEXTURE_2D, texid );
  17.         glTexImage2D( GL_TEXTURE_2D, 0, 3, t.width(), t.height(), 0, GL_RGBA, GL_UNSIGNED_BYTE, t.bits() );
  18.         glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
  19.         glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
  20.     }
  21.     virtual ~Tile(){
  22.         glDeleteTextures(1,&texid);
  23.     }
  24.     void draw(){
  25.         glPushMatrix();
  26.         glTranslatef(64.0f * gl_x, 64.0f * gl_y, 0.0f); // just to avoid total overlapping
  27.         glBindTexture(1,texid);
  28.         qDebug() << "draw texid" << texid;
  29.         glBegin(GL_QUADS);
  30.             glTexCoord2f(1.0f,1.0f);
  31.             glVertex2f(0.0f,0.0f);
  32.  
  33.             glTexCoord2f(1.0f,0.0f);
  34.             glVertex2f(0.0f,128.0f);
  35.  
  36.             glTexCoord2f(0.0f,0.0f);
  37.             glVertex2f(128.0f,128.0f);
  38.  
  39.             glTexCoord2f(0.0f,1.0f);
  40.             glVertex2f(128.0f,0.0f);
  41.         glEnd();
  42.         glPopMatrix();
  43.     }
  44. private:
  45.     GLfloat gl_x;
  46.     GLfloat gl_y;
  47.     GLuint texid;
  48.  
  49. };
  50.  
  51.  
  52. // THE GL WIDGET CLASS
  53. class GLTest : public QGLWidget
  54. {
  55. public:
  56.     GLTest(QWidget* parent = 0);
  57.     virtual ~GLTest();
  58. protected:
  59.     void initializeGL();
  60.     void resizeGL(int w, int h);
  61.     void paintGL();
  62.  
  63.     QList<Tile*> tiles;
  64. };
  65.  
  66. GLTest::GLTest(QWidget* parent) : QGLWidget(parent)
  67. {
  68.  
  69. }
  70. GLTest::~GLTest()
  71. {
  72.     for (QList<Tile*>::iterator i = tiles.begin(); i!=tiles.end(); ++i)
  73.     {
  74.         delete (*i);
  75.     }
  76. }
  77.  
  78. void GLTest::initializeGL()
  79. {
  80.     glClearColor(0.5f,0.5f,0.5f,1.0f);
  81.     glEnable(GL_TEXTURE_2D);
  82.     qDebug() << "init GL ";
  83.     tiles.append(new Tile(0.0f, 2.0f, QString("./images/side1.png")));
  84.     tiles.append(new Tile(1.0f, 3.0f, QString("./images/side2.png")));
  85.     tiles.append(new Tile(3.0f, 4.0f, QString("./images/side4.png")));
  86.  
  87. }
  88.  
  89. void GLTest::resizeGL(int w, int h)
  90. {
  91.  
  92.     glMatrixMode (GL_PROJECTION);
  93.     glLoadIdentity ();
  94.     glOrtho(0, w, h, 0, -1, 1);
  95.     glMatrixMode(GL_MODELVIEW);
  96.     glViewport(0,0,w, h);
  97.     glLoadIdentity();
  98. }
  99.  
  100. void GLTest::paintGL()
  101. {
  102.  
  103.     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  104.     glLoadIdentity();
  105.     glColor3f(1.0f,1.0f,1.0f);
  106.  
  107.     for (QList<Tile*>::iterator i = tiles.begin(); i!=tiles.end(); ++i)
  108.     {
  109.         (*i)->draw();
  110.     }
  111.  
  112. }
  113.  
  114. int main(int argc, char** argv)
  115. {
  116.     QApplication app(argc, argv);
  117.     GLTest gltest;
  118.     gltest.show();
  119.     return app.exec();
  120. }
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Thx for any help and suggestions.