Adding a few more shader examples

java/examples/Topics/Shaders/Deform/Deform.pde

@@ -0,0 +1,19 @@
+PImage tex;
+PShader deform;
+
+void setup() {
+  size(512, 384, P2D);
+  
+  textureWrap(REPEAT);   
+  tex = loadImage("tex1.jpg");
+ 
+  deform = loadShader("deform.glsl");
+  deform.set("resolution", float(width), float(height));
+}
+
+void draw() {
+  deform.set("time", millis() / 1000.0);
+  deform.set("mouse", float(mouseX), float(mouseY));
+  shader(deform);
+  image(tex, 0, 0, width, height);
+}

java/examples/Topics/Shaders/Deform/data/deform.glsl

@@ -0,0 +1,24 @@
+uniform sampler2D textureSampler;
+
+uniform float time;
+uniform vec2 resolution;
+uniform vec2 mouse;
+
+void main(void) {
+    vec2 p = -1.0 + 2.0 * gl_FragCoord.xy / resolution.xy;
+    vec2 m = -1.0 + 2.0 * mouse.xy / resolution.xy;
+
+    float a1 = atan(p.y - m.y, p.x - m.x);
+    float r1 = sqrt(dot(p - m, p - m));
+    float a2 = atan(p.y + m.y, p.x + m.x);
+    float r2 = sqrt(dot(p + m, p + m));
+
+    vec2 uv;
+    uv.x = 0.2 * time + (r1 - r2) * 0.25;
+    uv.y = sin(2.0 * (a1 - a2));
+
+    float w = r1 * r2 * 0.8;
+    vec3 col = texture2D(textureSampler, 0.5 - 0.495 * uv).xyz;
+
+    gl_FragColor = vec4(col / (0.1 + w), 1.0);
+}