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!