cinder fbo scissor

gistfile1.txt

#include "cinder/app/AppBasic.h"
#include "cinder/gl/gl.h"
#include "cinder/gl/Fbo.h"

using namespace ci;
using namespace ci::app;
using namespace std;

class MirroredFboApp : public AppBasic {
public:
	void setup();
	void update();
	void draw();
    
	gl::Fbo fbo1, fbo2;
};

void MirroredFboApp::setup()
{
	gl::enableAlphaBlending();
	fbo1 = gl::Fbo( getWindowWidth()/2, getWindowHeight() );
	fbo2 = gl::Fbo( getWindowWidth(), getWindowHeight() );
}

void MirroredFboApp::update()
{
	fbo1.bindFramebuffer();
        gl::clear( Color(1,1,0 ) );
        gl::color(Color(255,255,255));
        gl::drawSolidCircle(getWindowCenter(), 200);
	fbo1.unbindFramebuffer();
    
	fbo2.bindFramebuffer();
        gl::clear( Color(1,1,1 ) );
        gl::color(Color(255,0,0));
        gl::drawSolidCircle(getWindowCenter(), 200);
	fbo2.unbindFramebuffer();
}

void MirroredFboApp::draw()
{
	gl::clear( Color( 0, 0, 0 ) );
	gl::color(Color(1,1,1));
//	gl::draw(fbo2.getTexture(),Vec2f::zero());
//	gl::draw(fbo2.getTexture(), Rectf(fbo1.getWidth()/2,0,fbo1.getWidth(),fbo1.getHeight() ));
    
    fbo2.getTexture().enableAndBind();
    glEnable(GL_SCISSOR_TEST);
        glScissor( 0,0,fbo2.getWidth()*0.5,fbo2.getHeight() );
        gl::drawSolidRect( Rectf(0,0,fbo2.getWidth(),fbo2.getHeight()) );
    gl::disable(GL_SCISSOR_TEST);
    fbo2.unbindTexture();
}

CINDER_APP_BASIC( MirroredFboApp, RendererGl )