Отрисовка во весь экран

static GLfloat vertices2[][3] = {
    { -1, -1, 0 },
    {  -1, 1, 0 },
    {  1, 1, 0 },
    {  1, -1, 0 }
};
 
static GLint colors2[][4] = {
    { 0x00000, 0x00000, 0x00000, 0x10000 },
    { 0x10000, 0x00000, 0x00000, 0x10000 },
    { 0x10000, 0x10000, 0x00000, 0x10000 },
    { 0x00000, 0x10000, 0x00000, 0x10000 }
};
 
GLubyte indices2[] = {
    0, 1, 2,    2, 3, 0,
};

void Renderer::draw()
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
    glViewport(0, 0, _width, _height);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
 
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
    glRotatef(_angle, 0, 1, 0);
 
    glEnableClientState(GL_VERTEX_ARRAY);
    glEnableClientState(GL_COLOR_ARRAY);
 
    glFrontFace(GL_CW);
    glVertexPointer(3, GL_FIXED, 0, vertices2);
    glColorPointer(4, GL_FIXED, 0, colors2);
    glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_BYTE, indices2);
 
    eglSwapBuffers( _display, _surface );
}