Integration between vuforia's EAGLview and other opengl view

Hello,

i basically have an OpenGL standalone application that works (let's say a simple shader). I would like to compile it as a library and call it from within the xcode image targets sample: this way, i can easily change the library behaviour and deploy it much faster in both ios and android.

That said, the first thing i did was to try to wrap my working code (so no library yet) and see if thing worked. So i'm trying to glue this ios sample ( http://www.ignaciosanchezgines.com/2009/08/27/iphone-and-c-opengl-programming/ ) with the imagetarget sample

void openglWrapper::Init(EAGLContext* pContext, GLuint renderBuffer, GLuint frameBuffer, GLuint depthBuffer){    m_pContext = pContext;    m_uiViewRenderbuffer = renderBuffer;    m_uiViewFramebuffer = frameBuffer;    m_uiDepthRenderbuffer = depthBuffer;}

- (void) postInitQCAR{    openglWrapper::Instance().Init(context, colorRenderbuffer, defaultFramebuffer, depthRenderbuffer);}

so far, it seems so good. I then have a few functions taken from that sample, that basically draws on screen

void openglWrapper::Update(void){    BeginRender();    DrawSomething();    EndRender();}void openglWrapper::BeginRender(void){    [EAGLContext setCurrentContext:m_pContext];    glBindFramebufferOES(GL_FRAMEBUFFER_OES, m_uiViewFramebuffer);   // glViewport(0, 0, 320, 480);}void openglWrapper::EndRender(void){    glBindRenderbufferOES(GL_RENDERBUFFER_OES, m_uiViewRenderbuffer);    [m_pContext presentRenderbuffer:GL_RENDERBUFFER_OES];}void openglWrapper::DrawSomething(void){    const GLfloat squareVertices[] = {        -0.5f, -0.5f,        0.5f,  -0.5f,        -0.5f,  0.5f,        0.5f,   0.5f,    };    const GLubyte squareColors[] = {        255, 255,   0, 255,        0,   255, 255, 255,        0,     0,   0,   0,        255,   0, 255, 255,    };          glMatrixMode(GL_PROJECTION);    glLoadIdentity();    glOrthof(-1.0f, 1.0f, -1.5f, 1.5f, -1.0f, 1.0f);    glMatrixMode(GL_MODELVIEW);    glRotatef(3.0f, 0.0f, 0.0f, 1.0f);        glClearColor(0.5f, 0.5f, 0.5f, 1.0f);    glClear(GL_COLOR_BUFFER_BIT);        glVertexPointer(2, GL_FLOAT, 0, squareVertices);    glEnableClientState(GL_VERTEX_ARRAY);    glColorPointer(4, GL_UNSIGNED_BYTE, 0, squareColors);    glEnableClientState(GL_COLOR_ARRAY);        glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);        }

However, when i call the instance.Update() function (after the QCar Render)

    QCAR::Renderer::getInstance().end();    [self presentFramebuffer];        openglWrapper::Instance().Update();

All i get is a white screen. It seems that the only function that is doing something is the glClear(). If i try to remove it (i don't wan't to clear the buffer, after all) all i get is a black screen, even just after the first glMatrixMode().

I need some guidance in how to glue these two projects togheter.

Thanks in advance!