Added shader examples to OpenGL Android

android/examples/OpenGL/Shaders/EdgeDetect/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
+          package="" 
+          android:versionCode="1" 
+          android:versionName="1.0">
+  <uses-sdk android:minSdkVersion="8" />
+  <application android:label=""
+               android:icon="@drawable/icon"
+               android:debuggable="true">
+    <activity android:name="">
+      <intent-filter>
+        <action android:name="android.intent.action.MAIN" />
+        <category android:name="android.intent.category.LAUNCHER" />
+      </intent-filter>
+    </activity>
+  </application>
+</manifest>

android/examples/OpenGL/Shaders/EdgeDetect/EdgeDetect.pde

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+// This example shows how to change the default fragment shader used
+// in P3D to render textures, by a custom one that applies a simple 
+// edge detection filter.
+//
+// Press any key to switch between the custom and the default shader.
+
+PImage img;
+PShader shader;
+PGraphicsAndroid3D pg;  
+boolean usingShader;
+  
+void setup() {
+  size(400, 400, P3D);
+  img = loadImage("berlin-1.jpg");
+    
+  pg = (PGraphicsAndroid3D)g;
+  shader = pg.loadShader("edges.glsl", FILL_SHADER_TEX);
+  pg.setShader(shader, FILL_SHADER_TEX);
+  usingShader = true;
+}
+
+void draw() {
+  image(img, 0, 0, width, height);
+}
+  
+void mousePressed() {
+  if (usingShader) {
+    pg.resetShader(FILL_SHADER_TEX);
+    usingShader = false;
+  } else {
+    pg.setShader(shader, FILL_SHADER_TEX);
+    usingShader = true;
+  }
+}

android/examples/OpenGL/Shaders/EdgeDetect/data/edges.glsl

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+// Edge detection shader
+
+precision mediump float;
+
+uniform sampler2D textureSampler;
+
+// The inverse of the texture dimensions along X and Y
+uniform vec2 texcoordOffset;
+
+varying vec4 vertColor;
+varying vec4 vertTexcoord;
+
+void main() {
+  vec4 sum = vec4(0);
+
+  float kernel[9];
+  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;
+
+  vec2 offset[9];
+  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);
+
+  for (int i = 0; i < 9; i++) {
+    vec4 tmp = texture2D(textureSampler, vertTexcoord.st + offset[i]);
+    sum += tmp * kernel[i];
+  }
+
+  gl_FragColor = vec4(sum.rgb, 1.0);
+}

android/examples/OpenGL/Shaders/EdgeDetect/sketch.properties

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+mode=Android

android/examples/OpenGL/Shaders/ToonShading/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
+          package="" 
+          android:versionCode="1" 
+          android:versionName="1.0">
+  <uses-sdk android:minSdkVersion="8" />
+  <application android:label=""
+               android:icon="@drawable/icon"
+               android:debuggable="true">
+    <activity android:name="">
+      <intent-filter>
+        <action android:name="android.intent.action.MAIN" />
+        <category android:name="android.intent.category.LAUNCHER" />
+      </intent-filter>
+    </activity>
+  </application>
+</manifest>

android/examples/OpenGL/Shaders/ToonShading/ToonShading.pde

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+// Example showing the use of a custom lighting shader in order  
+// to apply a toon effect on the scene.
+
+PShader shader;
+PGraphicsAndroid3D pg;  
+boolean usingShader;  
+
+public void setup() {
+  size(400, 400, P3D);
+  noStroke();
+  fill(204);
+
+  pg = (PGraphicsAndroid3D)g;
+  shader = pg.loadShader("ToonVert.glsl", "ToonFrag.glsl", FILL_SHADER_LIT);
+  pg.setShader(shader, FILL_SHADER_LIT);
+  usingShader = true;
+}
+
+void draw() {
+  noStroke(); 
+  background(0); 
+  float dirY = (mouseY / float(height) - 0.5) * 2;
+  float dirX = (mouseX / float(width) - 0.5) * 2;
+  directionalLight(204, 204, 204, -dirX, -dirY, -1);
+  translate(width/2, height/2); 
+  sphere(80);
+}  
+
+void keyPressed() {
+  if (usingShader) {
+    pg.resetShader(FILL_SHADER_LIT);
+    usingShader = false;
+  } 
+  else {
+    pg.setShader(shader, FILL_SHADER_LIT);
+    usingShader = true;
+  }
+}
+

android/examples/OpenGL/Shaders/ToonShading/data/ToonFrag.glsl

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+precision mediump float;
+
+varying vec3 vertNormal;
+varying vec3 vertLightDir;
+
+void main() {  
+  float intensity;
+  vec4 color;
+  intensity = max(0.0, dot(vertLightDir, vertNormal));
+
+  if (intensity > 0.95) {
+    color = vec4(1.0, 0.5, 0.5, 1.0);
+  } else if (intensity > 0.5) {
+    color = vec4(0.6, 0.3, 0.3, 1.0);
+  } else if (intensity > 0.25) {
+    color = vec4(0.4, 0.2, 0.2, 1.0);
+  } else {
+    color = vec4(0.2, 0.1, 0.1, 1.0);
+  }
+
+  gl_FragColor = color;  
+}

android/examples/OpenGL/Shaders/ToonShading/data/ToonVert.glsl

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+// Toon shader using per-pixel lighting. Based on the glsl 
+// tutorial from lighthouse 3D:
+// http://www.lighthouse3d.com/tutorials/glsl-tutorial/toon-shader-version-ii/
+
+uniform mat4 modelviewMatrix;
+uniform mat4 projmodelviewMatrix;
+uniform mat3 normalMatrix;
+
+uniform vec3 lightNormal[8];
+
+attribute vec4 inVertex;
+attribute vec3 inNormal;
+
+varying vec3 vertNormal;
+varying vec3 vertLightDir;
+
+void main() {
+  // Vertex in clip coordinates
+  gl_Position = projmodelviewMatrix * inVertex;
+  
+  // Normal vector in eye coordinates is passed
+  // to the fragment shader
+  vertNormal = normalize(normalMatrix * inNormal);
+  
+  // Assuming that there is only one directional light.
+  // Its normal vector is passed to the fragment shader
+  // in order to perform per-pixel lighting calculation.  
+  vertLightDir = -lightNormal[0]; 
+}