Docs 0.11.0

#include "ofApp.h"

//--------------------------------------------------------------
void ofApp::setup() {
	ofBackground(0, 0, 0);

	cameraRotation ={0,0,0};
	zoom = -500;
	zoomTarget = 200;

	billboards.getVertices().resize(NUM_BILLBOARDS);
	billboards.getColors().resize(NUM_BILLBOARDS);
	billboards.getNormals().resize(NUM_BILLBOARDS,glm::vec3(0));

	// ------------------------- billboard particles
	for (int i=0; i<NUM_BILLBOARDS; i++) {

		billboardVels[i] = {ofRandomf(), -1.0, ofRandomf()};
        billboards.getVertices()[i] = {ofRandom(-500, 500),ofRandom(-500, 500),ofRandom(-500, 500)};
		
		billboards.getColors()[i].set(ofColor::fromHsb(ofRandom(96, 160), 255, 255));
	    billboardSizeTarget[i] = ofRandom(4, 64);

	}


	billboards.setUsage( GL_DYNAMIC_DRAW );
	billboards.setMode(OF_PRIMITIVE_POINTS);
	//billboardVbo.setVertexData(billboardVerts, NUM_BILLBOARDS, GL_DYNAMIC_DRAW);
	//billboardVbo.setColorData(billboardColor, NUM_BILLBOARDS, GL_DYNAMIC_DRAW);

	// load the billboard shader
	// this is used to change the
	// size of the particle
	if(ofIsGLProgrammableRenderer()){
		billboardShader.load("shadersGL3/Billboard");
	}else{
		billboardShader.load("shadersGL2/Billboard");
	}

	// we need to disable ARB textures in order to use normalized texcoords
	ofDisableArbTex();
	texture.load("dot.png");
	ofEnableAlphaBlending();
}

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

	float t = (ofGetElapsedTimef()) * 0.9f;
	float div = 250.0;

	for (int i=0; i<NUM_BILLBOARDS; i++) {

		// noise
		glm::vec3 vec(ofSignedNoise(t, billboards.getVertex(i).y/div, billboards.getVertex(i).z/div),
								ofSignedNoise(billboards.getVertex(i).x/div, t, billboards.getVertex(i).z/div),
								ofSignedNoise(billboards.getVertex(i).x/div, billboards.getVertex(i).y/div, t));

		vec *= 10 * ofGetLastFrameTime();
		billboardVels[i] += vec;
		billboards.getVertices()[i] += billboardVels[i];
		billboardVels[i] *= 0.94f;
    	billboards.setNormal(i,glm::vec3(12 + billboardSizeTarget[i] * ofNoise(t+i),0,0));
	}


	// move the camera around
	float mx = (float)mouseX/(float)ofGetWidth();
	float my = (float)mouseY/(float)ofGetHeight();
	glm::vec3 des(mx * 360.0, my * 360.0, 0);
	cameraRotation += (des-cameraRotation) * 0.03;
	zoom += (zoomTarget - zoom) * 0.03;

}

//--------------------------------------------------------------
void ofApp::draw() {
	ofBackgroundGradient(ofColor(255), ofColor(230, 240, 255));

	string info = ofToString(ofGetFrameRate(), 2)+"\n";
	info += "Particle Count: "+ofToString(NUM_BILLBOARDS);
	ofDrawBitmapStringHighlight(info, 30, 30);

	ofSetColor(255);

	ofPushMatrix();
	ofTranslate(ofGetWidth()/2, ofGetHeight()/2, zoom);
	ofRotateDeg(cameraRotation.x, 1, 0, 0);
	ofRotateDeg(cameraRotation.y, 0, 1, 0);
	ofRotateDeg(cameraRotation.y, 0, 0, 1);

	// bind the shader so that wee can change the
	// size of the points via the vert shader
	billboardShader.begin();

	ofEnablePointSprites(); // not needed for GL3/4
	texture.getTexture().bind();
	billboards.draw();
	texture.getTexture().unbind();
	ofDisablePointSprites(); // not needed for GL3/4

	billboardShader.end();

	ofPopMatrix();
}

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

	if(key == 'f') ofToggleFullscreen();
	if(key == OF_KEY_UP) zoomTarget +=10;
	if(key == OF_KEY_DOWN) zoomTarget -=10;
}


//--------------------------------------------------------------
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){

}