Fixed Framingham and Frames examples in Video, added ImageMask in OpenGL/Shaders

java/examples/OpenGL/Shaders/ImageMask/ImageMask.pde

@@ -0,0 +1,25 @@
+PImage srcImage;
+PGraphics maskImage;
+PShader maskShader;
+  
+void setup() {
+  size(200, 200, P2D);
+  srcImage = loadImage("milan_rubbish.jpg");
+  maskImage = createGraphics(srcImage.width, srcImage.height, P2D);
+  maskImage.noSmooth();
+  maskShader = loadShader("mask.glsl");
+  maskShader.set("maskSampler", maskImage);
+}
+    
+void draw() {    
+  maskImage.beginDraw();
+  maskImage.background(0);
+  maskImage.noStroke();
+  maskImage.fill(255, 0, 0);
+  maskImage.ellipse(mouseX, mouseY, 30, 30);
+  maskImage.endDraw();
+    
+  shader(maskShader);    
+  image(srcImage, 0, 0, width, height);
+  resetShader();
+}

java/examples/OpenGL/Shaders/ImageMask/data/mask.glsl

@@ -0,0 +1,12 @@
+uniform sampler2D textureSampler;
+uniform sampler2D maskSampler;
+
+uniform vec2 texcoordOffset;
+varying vec4 vertColor;
+varying vec4 vertTexcoord;
+
+void main() {
+  vec4 texColor = texture2D(textureSampler, vertTexcoord.st).rgba;
+  vec4 maskColor = texture2D(maskSampler, vec2(vertTexcoord.s, 1.0 - vertTexcoord.t)).rgba;
+  gl_FragColor = mix(texColor, vec4(0, 0, 0, 0), 1.0 - maskColor.r);  
+}