Added BlurFilter and EdgeFilter examples

java/libraries/opengl/examples/Shaders/BlurFilter/BlurFilter.pde

@@ -0,0 +1,32 @@
+PShader blur;
+boolean applyFilter = true;
+
+void setup() {
+  size(400, 400, P3D);
+  blur = (PShader)loadShader("blur.glsl");
+  noStroke(); 
+}
+
+void draw() {
+  background(0);
+  lights();
+  
+  translate(width/2, height/2);  
+  pushMatrix();
+  rotateX(frameCount * 0.01);  
+  rotateY(frameCount * 0.01);
+  box(100);
+  popMatrix();
+    
+  if (applyFilter) filter(blur);
+
+  // The sphere doesn't have blur applied on it
+  // because it is drawn after filter() is called.
+  rotateY(frameCount * 0.02);
+  translate(150, 0);
+  sphere(40);
+}
+
+void mousePressed() {
+  applyFilter = !applyFilter;
+}

java/libraries/opengl/examples/Shaders/BlurFilter/data/blur.glsl

@@ -0,0 +1,43 @@
+uniform sampler2D textureSampler;
+uniform vec2 texcoordOffset;
+
+varying vec4 vertColor;
+varying vec4 vertTexcoord;
+
+#define KERNEL_SIZE 9
+
+// Gaussian kernel
+// 1 2 1
+// 2 4 2
+// 1 2 1
+float kernel[KERNEL_SIZE];
+
+vec2 offset[KERNEL_SIZE];
+
+void main(void) {
+  int i = 0;
+  vec4 sum = vec4(0.0);
+
+  offset[0] = vec2(-texcoordOffset.s, -texcoordOffset.t);
+  offset[1] = vec2(0.0, -texcoordOffset.t);
+  offset[2] = vec2(texcoordOffset.s, -texcoordOffset.t);
+
+  offset[3] = vec2(-texcoordOffset.s, 0.0);
+  offset[4] = vec2(0.0, 0.0);
+  offset[5] = vec2(texcoordOffset.s, 0.0);
+
+  offset[6] = vec2(-texcoordOffset.s, texcoordOffset.t);
+  offset[7] = vec2(0.0, texcoordOffset.t);
+  offset[8] = vec2(texcoordOffset.s, texcoordOffset.t);
+
+  kernel[0] = 1.0/16.0;   kernel[1] = 2.0/16.0;   kernel[2] = 1.0/16.0;
+  kernel[3] = 2.0/16.0;   kernel[4] = 4.0/16.0;   kernel[5] = 2.0/16.0;
+  kernel[6] = 1.0/16.0;   kernel[7] = 2.0/16.0;   kernel[8] = 1.0/16.0;
+
+  for(i = 0; i < KERNEL_SIZE; i++) {
+    vec4 tmp = texture2D(textureSampler, vertTexcoord.st + offset[i]);
+    sum += tmp * kernel[i];
+  }
+
+  gl_FragColor = vec4(sum.rgb, 1.0) * vertColor;
+}

java/libraries/opengl/examples/Shaders/EdgeFilter/EdgeFilter.pde

@@ -0,0 +1,11 @@
+PShader edges;
+
+void setup() {
+  size(400, 400, P2D);
+  edges = (PShader)loadShader("edges.glsl"); 
+}
+
+void draw() {
+  rect(mouseX, mouseY, 50, 50);    
+  filter(edges);    
+}

java/libraries/opengl/examples/Shaders/EdgeFilter/data/edges.glsl

@@ -0,0 +1,43 @@
+uniform sampler2D textureSampler;
+uniform vec2 texcoordOffset;
+
+varying vec4 vertColor;
+varying vec4 vertTexcoord;
+
+#define KERNEL_SIZE 9
+
+// Edge detection kernel
+// -1 -1 -1
+// -1 +8 -1
+// -1 -1 -1
+float kernel[KERNEL_SIZE];
+
+vec2 offset[KERNEL_SIZE];
+
+void main(void) {
+    int i = 0;
+    vec4 sum = vec4(0.0);
+
+    offset[0] = vec2(-texcoordOffset.s, -texcoordOffset.t);
+    offset[1] = vec2(0.0, -texcoordOffset.t);
+    offset[2] = vec2(texcoordOffset.s, -texcoordOffset.t);
+
+    offset[3] = vec2(-texcoordOffset.s, 0.0);
+    offset[4] = vec2(0.0, 0.0);
+    offset[5] = vec2(texcoordOffset.s, 0.0);
+
+    offset[6] = vec2(-texcoordOffset.s, texcoordOffset.t);
+    offset[7] = vec2(0.0, texcoordOffset.t);
+    offset[8] = vec2(texcoordOffset.s, texcoordOffset.t);
+
+    kernel[0] = -1.0;   kernel[1] = -1.0;   kernel[2] = -1.0;
+    kernel[3] = -1.0;   kernel[4] = 8.0;    kernel[5] = -1.0;
+    kernel[6] = -1.0;   kernel[7] = -1.0;   kernel[8] = -1.0;
+
+    for(i = 0; i < KERNEL_SIZE; i++) {
+        vec4 tmp = texture2D(textureSampler, vertTexcoord.st + offset[i]);
+        sum += tmp * kernel[i];
+    }
+
+    gl_FragColor = vec4(sum.rgb, 1.0) * vertColor;
+}