PImage img;

float a,b;
int xpos;
int ypos;
int opacity;
void setup()
{
  size(250,250,P3D);
  img=loadImage("test4.png");
//  img.mask(img);
  xpos=0;
  ypos=0;
  a=0;
  b=0;
  opacity=255;
}

void additiveTintedBlend(PImage img, float locx, float locy,int mask,int opacity)
{
  PImage tmp=new PImage(img.width,img.height);
  tmp.loadPixels();
  img.loadPixels();
  opacity=constrain(opacity,0,255);
  for(int i=0;i<tmp.pixels.length;i++)
  {
    tmp.pixels[i]=((opacity<<24)+0x00FFFFFF)&(img.pixels[i]&mask);
  }
  tmp.updatePixels();
  blend(tmp,0,0,tmp.width,tmp.height,(int)locx,(int)locy,tmp.width,tmp.height,ADD);
}

void snow(int opacity)
{
  if(opacity>255)
    opacity=255;
  loadPixels();
  
  for(int i=0;i<pixels.length;i++)
  {
    int x=(int)random(-30,opacity+30);
    x=constrain(x,0,opacity);
    int tmp=pixels[i];
    int tmpr=(tmp&0x00FF0000)>>16;
    int tmpb=(tmp&0x0000FF00)>>8;
    int tmpg=(tmp&0x000000FF);
    tmpr=constrain(tmpr+x,0,255);
    tmpg=constrain(tmpg+x,0,255);
    tmpb=constrain(tmpb+x,0,255);
    pixels[i]=0xFF000000+(tmpr<<16)+(tmpb<<8)+tmpg;
    
  }
  updatePixels();
}

void draw()
{
  a+=random(0.001,0.01);
  b=noise(a,3.2345345*a);
  b*=1.4;
  b-=0.4;
  b=constrain(b,0,1);
//  b=random(0,0.6);
  background(0,0,0);
//  blend(img,0,0,img.width,img.height,20,20,img.width,img.height,ADD);
  opacity=180-(int)(180*b);
//  additiveTintedBlend(img,xpos,ypos,0xFFFFFFFF^((opacity<<16)+(opacity<<8)+opacity));
  additiveTintedBlend(img,xpos,ypos+15*b,0xFFFF0000,opacity);
  additiveTintedBlend(img,xpos+15*b,ypos,0xFF00FF00,opacity);
  additiveTintedBlend(img,xpos-15*b,ypos,0xFF0000FF,opacity);
//  filter(POSTERIZE,9);
 snow(255-opacity);
 if(frameCount%100==99)
    println(frameCount+":"+framerate);
}