Added source of mask shader

core/src/processing/opengl/MaskShaderFrag.glsl

@@ -0,0 +1,31 @@
+/*
+  Part of the Processing project - http://processing.org
+
+  Copyright (c) 2012 Ben Fry and Casey Reas
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License version 2.1 as published by the Free Software Foundation.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General
+  Public License along with this library; if not, write to the
+  Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+  Boston, MA  02111-1307  USA
+ */
+ 
+uniform sampler2D textureSampler;
+uniform sampler2D maskSampler;
+
+varying vec4 vertTexcoord;
+
+void main() {
+  vec3 texColor = texture2D(textureSampler, vertTexcoord.st).rgb;
+  vec3 maskColor = texture2D(maskSampler, vertTexcoord.st).rgb;
+  float luminance = dot(maskColor, vec3(0.2126, 0.7152, 0.0722));
+  gl_FragColor = vec4(texColor, luminance);  
+}

core/src/processing/opengl/PGraphicsOpenGL.java

@@ -187,7 +187,7 @@ public class PGraphicsOpenGL extends PGraphics {
   static protected PointShader defPointShader;
 
   static protected URL maskShaderFragURL = 
-    PGraphicsOpenGL.class.getResource("TexMaskShaderFrag.glsl");  
+    PGraphicsOpenGL.class.getResource("MaskShaderFrag.glsl");  
   static protected PolyTexShader maskShader;  
   
   protected PolyColorShader polyColorShader;