[SOLVED] Drawing a textured 3D object breaks SFML text rendering

[zhensydow]

I writing a OpenGL game using SFML.

I'm using the push/pop function to combine OpenGL with SFML like the tutorial SFML+OpenGL but, when I added textures to my model, the SFML text rendering appears broken and wrong rendered.

The simplified loop I used is:

while( true ){
    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );

    mydraw();

    window->pushGLStates();
    window->draw( text );
    window->popGLStates();
    window->display();
}
 

Using this simple mydraw function causes the SFML text not drawing:

   
    glUseProgram( myprogram );
    glEnableVertexAttribArray( 0 );
    glBindBuffer( GL_ARRAY_BUFFER, verts_buffer );
    glVertexAttribPointer( 0, 3, GL_FLOAT, GL_FALSE, 0, nullptr );
 

If I commented out the mydraw call, the text is visible again.

[zhensydow]

I were using SFML 2.0 and I just upgrade to 2.1, but the problem remains.

[Laurent]

You must disable what you enable. SFML does its best to reset all OpenGL states for drawing, but it can only handle OpenGL 2.x states.

[zhensydow]

Great! I added:

   
    glBindBuffer( GL_ARRAY_BUFFER, 0 );
    glDisableVertexAttribArray( 0 );
    glUseProgram( 0 );
 

And now it works.

Also, If I use only  3.3 core   Can I remove pushGLStates/popGLStates saving a few nanoseconds/per frame?

[Laurent]

Can I remove pushGLStates/popGLStates saving a few nanoseconds/per frame?

Yes. You can remove them even with OpenGL 2.x, if you know exactly what you do with the states. And don't forget to call window.resetGLStates() before drawing with SFML.