Trying to figure out why i can't do something

transitions.cpp

#include "testApp.h"
#define STRINGIFY(A) "#define QUALITY 32 \n uniform float progress; \n uniform vec2 resolution; \n uniform float time; \n uniform sampler2DRect first; \n uniform sampler2DRect second; \n" #A
float width, height;
//--------------------------------------------------------------
void testApp::setup(){
    string shaderProgram = STRINGIFY(  

        void main (void){
            vec2 pos = gl_FragCoord.xy;
            vec4 src = texture2DRect(second, pos);

            gl_FragColor = src;
        }
    );
    
    string windTransition = STRINGIFY(          
          // Custom parameters
          uniform float size = 0.2f;
          
          float rand (vec2 co) {
              return fract(sin(dot(co.xy ,vec2(12.9898,78.233))) * 43758.5453);
          }
          
          void main() {
              vec2 pos = gl_FragCoord.xy;
              float r = rand(vec2(0, pos.y));
              float m = smoothstep(0.0, -size, pos.x*(1.0-size) + size*r - (progress * (1.0 + size)));
              gl_FragColor = mix(texture2DRect(first, pos), texture2DRect(second, pos), m);
          }
    ); 
    
    string blur2Transition = STRINGIFY(
                                      
      void main() {
          vec2 p = gl_FragCoord.xy ;
          gl_FragColor = mix(texture2DRect(first, p), texture2DRect(second, p), progress);
      }
    ); 
    shader.setupShaderFromSource(GL_FRAGMENT_SHADER, wipeTransition);
    shader.linkProgram();
    
    width = ofGetWidth();
    height = ofGetHeight();
    
    first.loadImage("images/girl1.jpg");
    second.loadImage("images/girl2.jpg");
    
    fbo.allocate(width, height);
    
    firstFbo.allocate(width, height);
    
    secondFbo.allocate(width, height);
    
    firstFbo.begin();
    ofClear(0,0,0,255);
    firstFbo.end();
    
    secondFbo.begin();
    ofClear(0,0,0,255);
    secondFbo.end();
     
}

//--------------------------------------------------------------
void testApp::update(){
    firstFbo.begin(); 
    first.draw(0, 0, width, height);
    firstFbo.end();
    
    
    secondFbo.begin();
    second.draw(0, 0, width, height);
    secondFbo.end();
    
        
    fbo.begin();
    
    ofClear(0, 0, 0, 0);
    
    shader.begin();
    
    float resolution[] = {(float)width, (float)height};
    float direction[] = {(1.0f, 0.0f)};
    float time = ofGetElapsedTimef();
    
    shader.setUniform1f("time",time);
    shader.setUniform2fv("resolution",resolution);
    float progress = ofMap(mouseX, 0, width, 0, 1, true);
    shader.setUniform1f("progress", progress); 
    
    
    shader.setUniform2fv("direction", direction);

    
    shader.setUniformTexture("first", firstFbo.getTextureReference(), 0);
    shader.setUniformTexture("second", secondFbo.getTextureReference(), 1);
    
    
    glBegin(GL_QUADS);
	glTexCoord2f(0, 0); glVertex3f(0, 0, 0);
	glTexCoord2f(width, 0); glVertex3f(width, 0, 0);
	glTexCoord2f(width, height); glVertex3f(width, height, 0);
	glTexCoord2f(0,height);  glVertex3f(0,height, 0);
	glEnd();
    
    shader.end();
    
    fbo.end();
}

//--------------------------------------------------------------
void testApp::draw(){
    fbo.draw(0, 0, width, height);
}

//--------------------------------------------------------------
void testApp::keyPressed(int key){

}

//--------------------------------------------------------------
void testApp::keyReleased(int key){

}

//--------------------------------------------------------------
void testApp::mouseMoved(int x, int y ){

}

//--------------------------------------------------------------
void testApp::mouseDragged(int x, int y, int button){

}

//--------------------------------------------------------------
void testApp::mousePressed(int x, int y, int button){

}

//--------------------------------------------------------------
void testApp::mouseReleased(int x, int y, int button){

}

//--------------------------------------------------------------
void testApp::windowResized(int w, int h){

}

//--------------------------------------------------------------
void testApp::gotMessage(ofMessage msg){

}

//--------------------------------------------------------------
void testApp::dragEvent(ofDragInfo dragInfo){ 

}