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/**
* Wormhole Demo Effect
* by luis2048.
*/

PImage wormImg, wormTexture;
int[] reg = new int[15];

void setup(){
size(640,360,P2D);
noSmooth();

//Reference image used to transpose texture
wormImg = loadImage("wormhole.png");
wormImg.resize(width,height);
wormImg.loadPixels();

wormTexture = loadImage("texture.gif");
wormTexture.loadPixels();
}

void shiftup(){
for(int k =0; k < 15; k++){
reg[k] = wormTexture.pixels[k];
}

for(int k = 15; k < 225; k ++){
wormTexture.pixels[k-15] = wormTexture.pixels[k];
}
for(int k =0; k < 15; k++){
wormTexture.pixels[k+210] = reg[k];
}
}

void shiftright(){
for(int k = 0; k < 15; k++){
reg[k] = wormTexture.pixels[15*k+14];
for(int i =14; i > 0; i --){
wormTexture.pixels[15*k+i] = wormTexture.pixels[15*k+(i-1)];
}
wormTexture.pixels[15*k] = reg[k];
}
}

void draw(){
loadPixels();

for(int i =0; i < pixels.length; i++){
pixels[i] = wormTexture.pixels[constrain(wormImg.pixels[i] & 0xFF,0,224)];
}
updatePixels();

shiftright();
shiftup();
}