Qt4 QGLwidget::renderPixmap don't render texture

[Glandelf]

Hello everybody,

I don't succeed in finding solution in following problem:

I know renderPixmap use initializeGL(), resizeGL(), and paintGL() in a new context.
So I do test with only one triangle textured. the list is creat with it's texture in initializeGL()
Result is good in window OpenGL but when I use renderPixmap, I got my triangle without image texture.

Here example code use in initializeGL() :

void ViewerOGL::initializeGL(){
    glClearColor(0.0f, 0.0f, 0.0f, 1.0f);   // Efface en noir
    glClearDepth(1.0f);
    glEnable(GL_DEPTH_TEST );              // Autorise le test de profondeur
    glDepthFunc(GL_LEQUAL);
    glFrontFace(GL_CCW );                   // Normale dans le sens horaire
    glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
    glShadeModel(GL_SMOOTH);               // Autorise anti-aliasing
    glEnable(GL_CULL_FACE );                 // Face arriere cache
    glEnable(GL_LIGHT0);                    // Active la 1ere lampe
    glEnable(GL_COLOR_MATERIAL);            // Autorise les materiaux
    glColorMaterial(GL_FRONT, GL_AMBIENT_AND_DIFFUSE);  // Autorise l'affichage
 
    glNewList(1, GL_COMPILE);
        QImage img("C:\\test.png");
        QImage tex;
        tex = QGLWidget::convertToGLFormat(img);
        GLuint nuId;
        glGenTextures(1, &nuId);        // ID OpenGL sur la texture
        glBindTexture(GL_TEXTURE_2D, nuId);
        glTexImage2D(GL_TEXTURE_2D, 0, 4, tex.width(), tex.height(), 0, GL_RGBA,GL_UNSIGNED_BYTE, tex.bits());
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
        glEnable(GL_TEXTURE_2D);
            glBegin(GL_TRIANGLES);
                glTexCoord2f(0, 0);
                glNormal3f(0, 0, 1);
                glVertex3f(0, 0, 0);
                glTexCoord2f(1, 0);
                glNormal3f(0, 0, 1);
                glVertex3f(200, 0, 0);
                glTexCoord2f(0.5, 1);
                glNormal3f(0, 0, 1);
                glVertex3f(100, 200, 0);
            glEnd();
        glDisable(GL_TEXTURE_2D);
    glEndList();
}

void ViewerOGL::initializeGL(){
    glClearColor(0.0f, 0.0f, 0.0f, 1.0f);   // Efface en noir
    glClearDepth(1.0f);
    glEnable(GL_DEPTH_TEST );              // Autorise le test de profondeur
    glDepthFunc(GL_LEQUAL);
    glFrontFace(GL_CCW );                   // Normale dans le sens horaire
    glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
    glShadeModel(GL_SMOOTH);               // Autorise anti-aliasing
    glEnable(GL_CULL_FACE );                 // Face arriere cache
    glEnable(GL_LIGHT0);                    // Active la 1ere lampe
    glEnable(GL_COLOR_MATERIAL);            // Autorise les materiaux
    glColorMaterial(GL_FRONT, GL_AMBIENT_AND_DIFFUSE);  // Autorise l'affichage

    glNewList(1, GL_COMPILE);
        QImage img("C:\\test.png");
        QImage tex;
        tex = QGLWidget::convertToGLFormat(img);
        GLuint nuId;
        glGenTextures(1, &nuId);        // ID OpenGL sur la texture
        glBindTexture(GL_TEXTURE_2D, nuId);
        glTexImage2D(GL_TEXTURE_2D, 0, 4, tex.width(), tex.height(), 0, GL_RGBA,GL_UNSIGNED_BYTE, tex.bits());
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
        glEnable(GL_TEXTURE_2D);
            glBegin(GL_TRIANGLES);
                glTexCoord2f(0, 0);
                glNormal3f(0, 0, 1);
                glVertex3f(0, 0, 0);
                glTexCoord2f(1, 0);
                glNormal3f(0, 0, 1);
                glVertex3f(200, 0, 0);
                glTexCoord2f(0.5, 1);
                glNormal3f(0, 0, 1);
                glVertex3f(100, 200, 0);
            glEnd();
        glDisable(GL_TEXTURE_2D);
    glEndList();
}

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Perhaps I forget an Enable, but which ?
Tanks for help

[Glandelf]

Hello everybody

Nobody got an idea ? Bad day for me. It's for job, not for fun...
But I find a new element.
RenderPixmap is ok with texture, if source image not bigger than 1024 x 1024.
But my source textures make at least 4096 x 4096, as well as my picture of exit. So I can't make a copy of screen.
Is someone knowing how push over this fence ?
Or another way to catch my goal ?

Pleeeaaase !