@diego_di_battista wrote:

i'm a nebbie in oF and this code dont'work why?
the scader it take from book "open frame work essential", sorry for bad language i italian

include "ofApp.h"

//--------------------------------------------------------------
void ofApp::setup(){

fbo.allocate(ofGetScreenWidth() , ofGetScreenHeight() , GL_RGBA); // fbo is an ofFbo
tex.allocate(ofGetScreenWidth() , ofGetScreenHeight() , ofImageType::OF_IMAGE_COLOR_ALPHA);
videomod.allocate(ofGetScreenWidth(), ofGetScreenHeight(), OF_PIXELS_RGB);
tex.allocate(videomod);
shader.load("kaleido.vert","kaleido.frag");

}

//--------------------------------------------------------------
void ofApp::update(){
if (camera.isInitialized()) camera.update();
{
fbo.begin();
disegno();
tex.draw(0, 0, ofGetScreenWidth(), ofGetScreenHeight());

	if (schaderacceso == 1)
		{

	shader.begin();
	shader.setUniform1i("Ksectors",15);
	shader.setUniform1f("KangleRad", 90);
	shader.setUniform2f("Kcenter", 500, 500);
	shader.setUniform2f("KscreenCenter", 500, 600);
	shader.end();
	}
		fbo.end();
	}
	}
	//--------------------------------------------------------------

void ofApp::draw(){
fbo.draw(0, 0, ofGetScreenWidth(), ofGetScreenHeight());

}
//--------------------------------------------------------------
void ofApp::keyPressed(int key){
if (key == 'c')
{ schaderacceso = !schaderacceso;}

if (key=='z')
{
camera.setDeviceID(0);
camera.setDesiredFrameRate(30);
camera.initGrabber(camx, camy);

}
if (key == 'a'){
volumeR = volumeR + 5;
volumeG = volumeG + 5;
volumeB = volumeB + 5;
if (volumeR >= 255)
{
volumeR = 0;
}
if (volumeG >= 255)
{
volumeG = 0;
}
if (volumeB >= 255)
{
volumeB = 0;
}

	}
if (key == 'r')
	volumeR = volumeR + 5;
{
	if (volumeR >= 255)
	{
	volumeR = 0;
}
}
if (key == 'g')
	volumeG = volumeG + 5;
{
	if (volumeG >= 255)
	{
		volumeG = 0;
	}
}
if (key == 'b')
	volumeB = volumeB + 5;

{
if (volumeB >= 255)
{
volumeB = 0;
}
}
}

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

}

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

}

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

}

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

}

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

}

//--------------------------------------------------------------
void ofApp::mouseEntered(int x, int y){

}

//--------------------------------------------------------------
void ofApp::mouseExited(int x, int y){

}

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

}

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

}

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

}
void ofApp::disegno() {
if (camera.isFrameNew()) {
ofPixels & pixels =camera.getPixels();
int dim = (camx* camy * 3);
for (int i = 0; i < dim ; i++) {
videomod[i]=abs(volumeR- pixels[i]);
i++;
videomod[i] = abs(volumeG - pixels[i]);
i++;
videomod[i] = abs(volumeB - pixels[i]);
}
}
tex.loadData(videomod);
}

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