midmapped fbo

gistfile1.txt

#include "ofMain.h"


void enableMidmap(ofTexture& texture) {
    texture.bind();
    int textureTarget = texture.getTextureData().textureTarget;
    glTexParameteri(textureTarget, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri(textureTarget, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
    glGenerateMipmap(GL_TEXTURE_2D); // automatically creates midmaps for textures
    texture.unbind();
}

class ofApp : public ofBaseApp{
public:
    
    ofVideoGrabber cam;
    ofFbo fbo;
    
    void setup() {
        ofDisableArbTex();
        cam.initGrabber(1920, 1080);
        fbo.allocate(1920, 1080);
    }
    
    void update() {        
        cam.update();
        if(cam.isFrameNew()) {
            enableMidmap(cam.getTextureReference());
        }
    }
    
    void draw() {
        fbo.begin();
        cam.draw(0, 0);
        fbo.end();
        enableMidmap(fbo.getTextureReference());
        
        ofPushMatrix();
        ofPushStyle();
        ofTranslate(ofGetWidth()/2, ofGetHeight()/2);
        float s = ofMap(ofGetMouseX(), 0, ofGetWidth(), 0, 2);
        ofScale(s,s);
        
        ofTexture & t = fbo.getTextureReference();
        t.draw(-t.getWidth()/2, -t.getHeight()/2);
        ofPopStyle();
        ofPopMatrix();
    }
};


//========================================================================
int main( ){

	ofSetupOpenGL(1024,768, OF_WINDOW);	
	ofRunApp( new ofApp());
}