add emboss example

Signed-off-by: Umair Khan <[email protected]>

Author: omerjerk

examples/Capture/Emboss/AndroidManifest.xml

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+<manifest xmlns:android="http://schemas.android.com/apk/res/android" android:versionCode="1" android:versionName="1.0" package=""><uses-sdk android:minSdkVersion="19"/><application android:debuggable="true" android:icon="@drawable/icon" android:label=""><activity android:name=".MainActivity">android:theme="@android:style/Theme.NoTitleBar"&gt;<intent-filter><action android:name="android.intent.action.MAIN"/><category android:name="android.intent.category.LAUNCHER"/></intent-filter></activity></application><uses-permission android:name="android.permission.CAMERA"/></manifest>

examples/Capture/Emboss/Emboss.pde

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+import in.omerjerk.processing.video.android.*;
+
+Capture cap;
+
+PShader embossShader;
+
+void setup() {
+  fullScreen(P2D);
+  String[] cameras = Capture.list();
+  cap = new Capture(this, cameras[0]);
+  cap.start();
+  embossShader = loadShader("fragmentShader.glsl");
+}
+
+void draw() {
+  cap.read();
+  shader(embossShader);
+  image(cap, 0, 0);
+}

examples/Capture/Emboss/data/fragmentShader.glsl

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+#ifdef GL_ES
+precision mediump float;
+precision mediump int;
+#endif
+
+#define PROCESSING_TEXTURE_SHADER
+
+uniform sampler2D texture;
+uniform vec2 texOffset;
+
+varying vec4 vertColor;
+varying vec4 vertTexCoord;
+
+const vec4 lumcoeff = vec4(0.299, 0.587, 0.114, 0);
+
+void main() {
+  vec2 tc0 = vertTexCoord.st + vec2(-texOffset.s, -texOffset.t);
+  vec2 tc1 = vertTexCoord.st + vec2(         0.0, -texOffset.t);
+  vec2 tc2 = vertTexCoord.st + vec2(-texOffset.s,          0.0);
+  vec2 tc3 = vertTexCoord.st + vec2(+texOffset.s,          0.0);
+  vec2 tc4 = vertTexCoord.st + vec2(         0.0, +texOffset.t);
+  vec2 tc5 = vertTexCoord.st + vec2(+texOffset.s, +texOffset.t);
+  
+  vec4 col0 = texture2D(texture, tc0);
+  vec4 col1 = texture2D(texture, tc1);
+  vec4 col2 = texture2D(texture, tc2);
+  vec4 col3 = texture2D(texture, tc3);
+  vec4 col4 = texture2D(texture, tc4);
+  vec4 col5 = texture2D(texture, tc5);
+
+  vec4 sum = vec4(0.5) + (col0 + col1 + col2) - (col3 + col4 + col5);
+  float lum = dot(sum, lumcoeff);
+  gl_FragColor = vec4(lum, lum, lum, 1.0) * vertColor;  
+}