void RenderableParticleEffectEntityItem::updateQuads(RenderArgs* args, bool textured) {
float particleRadius = getParticleRadius();
glm::vec4 particleColor(toGlm(getXColor()), getLocalRenderAlpha());
glm::vec3 upOffset = args->_viewFrustum->getUp() * particleRadius;
glm::vec3 rightOffset = args->_viewFrustum->getRight() * particleRadius;
QVector<glm::vec3> vertices;
QVector<glm::vec3> positions;
QVector<glm::vec2> textureCoords;
vertices.reserve(getLivingParticleCount() * VERTS_PER_PARTICLE);
if (textured) {
textureCoords.reserve(getLivingParticleCount() * VERTS_PER_PARTICLE);
}
positions.reserve(getLivingParticleCount());
for (quint32 i = _particleHeadIndex; i != _particleTailIndex; i = (i + 1) % _maxParticles) {
positions.append(_particlePositions[i]);
if (textured) {
textureCoords.append(glm::vec2(0, 1));
textureCoords.append(glm::vec2(1, 1));
textureCoords.append(glm::vec2(1, 0));
textureCoords.append(glm::vec2(0, 0));
}
}
// sort particles back to front
::zSortAxis = args->_viewFrustum->getDirection();
qSort(positions.begin(), positions.end(), zSort);
for (int i = 0; i < positions.size(); i++) {
glm::vec3 pos = (textured) ? positions[i] : _particlePositions[i];
// generate corners of quad aligned to face the camera.
vertices.append(pos + rightOffset + upOffset);
vertices.append(pos - rightOffset + upOffset);
vertices.append(pos - rightOffset - upOffset);
vertices.append(pos + rightOffset - upOffset);
}
if (textured) {
DependencyManager::get<GeometryCache>()->updateVertices(_cacheID, vertices, textureCoords, particleColor);
} else {
DependencyManager::get<GeometryCache>()->updateVertices(_cacheID, vertices, particleColor);
}
}
//--------------------------------------------------------------
void testApp::update(){
vidGrabber.grabFrame();
if (vidGrabber.isFrameNew()){
int totalPixels = camWidth*camHeight*3;
unsigned char * pixels = vidGrabber.getPixels();
camImg.setFromPixels(pixels,camWidth,camHeight,OF_IMAGE_COLOR,true);
if (((ofGetElapsedTimeMillis() - elapsedTime) > 10) && (keyPressed_Space || keyPressed_D || keyPressed_S || keyPressed_F)){
finder.findHaarObjects(camImg);
elapsedTime = ofGetElapsedTimeMillis();
}
//Particle system
ps.run();
if (keyPressed_Space){
for(int i = 0; i < finder.blobs.size(); i++) {
ofRectangle cur = finder.blobs[i].boundingRect;
//ofRect(cur.x, cur.y, cur.width, cur.height);
ofVec2f currentCentroid(finder.blobs[i].centroid.x,finder.blobs[i].centroid.y);
ofVec2f faceVelocity(previousCentroid.x - currentCentroid.x,previousCentroid.y - currentCentroid.y);
//If you shake your head the particles go away
if (currentCentroid.distance(previousCentroid) > 5){
spawnRate *= 0.55;
}
else{
spawnRate *= ofRandom(1.0,5.0);
}
//clamp it to something reasonable
spawnRate = MIN(MAX(spawnRate,1),100);
for(int j = 0; j < spawnRate; j++){
ofVec2f accel;
ofVec2f velocity;
ofVec2f location;
float radius = ofRandom(3,8);
velocity.set(0,0);
//Make the particles dynamic in this case
if (keyPressed_A){
accel.set(0,0.5);
velocity.set(0,-1);
velocity -= (faceVelocity*0.8);
}
else{
accel.set(0.0,0.0);
}
location.set(int(currentCentroid.x + ofRandom(-cur.width,cur.width)*0.5),int(currentCentroid.y + ofRandom(-cur.height,cur.height)*0.5));
int colorIndex = (location.y * camWidth + location.x-1)*3;
int distanceAlphaValue = ofClamp((255 - (location.distance(currentCentroid) / (cur.width*0.5)) * 255),0,255);
ofColor particleColor(pixels[colorIndex],pixels[colorIndex+1],pixels[colorIndex+2],distanceAlphaValue);
//ofColor particleColor(ofRandom(128,255),0,0);
Particle newParticle(accel,velocity,location,radius,particleColor);
ps.addParticle(newParticle);
}
previousCentroid.set(finder.blobs[i].centroid.x,finder.blobs[i].centroid.y);
}
}
}
}
