void CameraLensShiftTestApp::draw()
{
gl::clear();
gl::enableDepthRead();
gl::enableDepthWrite();
// draw the overview of the scene in the left half of the window
glPushAttrib( GL_VIEWPORT_BIT );
gl::setViewport( Area( getWindowWidth() * 0.0f, 0, getWindowWidth() * 0.5f, getWindowHeight() ) );
gl::pushMatrices();
gl::setMatrices( mOverview.getCamera() );
render();
gl::color( Color(0, 1, 1) );
gl::drawFrustum( mCamera );
gl::popMatrices();
glPopAttrib();
// draw what the camera sees in the right half of the window
glPushAttrib( GL_VIEWPORT_BIT );
gl::setViewport( Area( getWindowWidth() * 0.5f, 0, getWindowWidth() * 1.0f, getWindowHeight() ) );
gl::pushMatrices();
gl::setMatrices( mCamera );
render();
gl::popMatrices();
glPopAttrib();
//
gl::disableDepthWrite();
gl::disableDepthRead();
// draw separator
gl::color( Color(0.25f, 0.25f, 0.25f) );
gl::drawLine( Vec2f( getWindowWidth() * 0.5f, 0.0f ), Vec2f( getWindowWidth() * 0.5f, getWindowHeight() ) );
// draw info
gl::enableAlphaBlending();
gl::drawString(
(boost::format("Lens Shift X: %02.2f\nLens Shift Y: %02.2f\n\nUse cursor keys to adjust lens shift,\nuse mouse to control overview camera")
% mCamera.getLensShiftHorizontal() % mCamera.getLensShiftVertical() ).str(),
Vec2f( 10, 10 ), Color::white(), mFont );
gl::drawString( "Overview of the scene",
Vec2f( 10, getWindowHeight() - 28 ), Color::white(), mFont );
gl::drawString( "View from the camera",
Vec2f( 0.5f * getWindowWidth() + 10, getWindowHeight() - 28 ), Color::white(), mFont );
gl::disableAlphaBlending();
}
