Want an OpenGL 2D example (VC++, draw a rectangle)

Question

I want to create a high performace 2D program.

I\'m using VC++2008. Suppose I have created the main window. What I want is to draw a red rectangle (top left: 10,20,

Answer 1

Thank SuperMaximo93. I fininally got my code to work. Here is my code on window's size is changed. The function below is called in WM_SIZE's handler.

void OpenGlWindow::Resize(HWND hwnd)
{
    // Get new window size
    RECT rect;
    int width, height;

    GetClientRect(hwnd, &rect);
    width = rect.right;
    height = rect.bottom;

    glClearColor(0.0, 0.0, 0.0, 0.0);  //Set the cleared screen colour to black
    glViewport(0, 0, width, height);   //This sets up the viewport so that the coordinates (0, 0) are at the top left of the window

    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();

    //Back to the modelview so we can draw stuff 
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();

    glRotatef(180, 1.0f, 0, 0);
    glTranslatef(-1.0f, -1.0f, 0);
    glScalef(2.0f/width, 2.0f/height, 1);

    glTranslatef(2.0f, 2.0f, 0);
}