porting hello-libs, Teapot, endless-tunnel to cmake branch

  known issue: endless-tunnel audio play is broken on Android-N DP3
               will be fixed in DP4 in audio framework

Teapot/.google/packaging.yaml

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+status:       PUBLISHED
+technologies: [Android, NDK]
+categories:   [NDK]
+languages:    [C++, Java]
+solutions:    [Mobile]
+github:       googlesamples/android-ndk
+license:      apache2

Teapot/README.md

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+Teapot
+======
+Teapot is an Android C++ sample that draws a Teapot mesh using GLES 2.0 API and [NativeActivity](http://developer.android.com/reference/android/app/NativeActivity.html).
+
+This sample uses the new [Gradle Experimental Android plugin](http://tools.android.com/tech-docs/new-build-system/gradle-experimental) with C++ support.
+
+Pre-requisites
+--------------
+- Android Studio 2.2+ with [NDK](https://developer.android.com/ndk/) bundle.
+
+Getting Started
+---------------
+1. [Download Android Studio](http://developer.android.com/sdk/index.html)
+1. Launch Android Studio.
+1. Open the sample directory.
+1. Open *File/Project Structure...*
+  - Click *Download* or *Select NDK location*.
+1. Click *Tools/Android/Sync Project with Gradle Files*.
+1. Click *Run/Run 'app'*.
+
+Screenshots
+-----------
+![screenshot](screenshot.png)
+
+Support
+-------
+If you've found an error in these samples, please [file an issue](https://github.com/googlesamples/android-ndk/issues/new).
+
+Patches are encouraged, and may be submitted by [forking this project](https://github.com/googlesamples/android-ndk/fork) and
+submitting a pull request through GitHub. Please see [CONTRIBUTING.md](../CONTRIBUTING.md) for more details.
+
+- [Stack Overflow](http://stackoverflow.com/questions/tagged/android-ndk)
+- [Google+ Community](https://plus.google.com/communities/105153134372062985968)
+- [Android Tools Feedbacks](http://tools.android.com/feedback)
+
+License
+-------
+Copyright 2015 Google, Inc.
+
+Licensed to the Apache Software Foundation (ASF) under one or more contributor
+license agreements.  See the NOTICE file distributed with this work for
+additional information regarding copyright ownership.  The ASF licenses this
+file to you under the Apache License, Version 2.0 (the "License"); you may not
+use this file except in compliance with the License.  You may obtain a copy of
+the License at
+
+  http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+License for the specific language governing permissions and limitations under
+the License.

Teapot/app/build.gradle

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+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion = 23
+    buildToolsVersion = '23.0.2'
+
+    defaultConfig {
+        applicationId = 'com.sample.teapot'
+        minSdkVersion 17
+        targetSdkVersion 22
+        cmake {
+            abiFilters 'x86', 'x86_64', 'armeabi', 'armeabi-v7a', 'arm64-v8a'
+        }
+    }
+    buildTypes {
+            release {
+                minifyEnabled = false
+                proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+            }
+    }
+    externalNativeBuild {
+        cmake {
+            path 'src/main/cpp/CMakeLists.txt'
+        }
+    }
+}
+
+dependencies {
+    compile fileTree(dir: 'libs', include: ['*.jar'])
+    compile 'com.android.support:appcompat-v7:23.4.0'
+    compile 'com.android.support.constraint:constraint-layout:1.0.0-alpha2'
+}

Teapot/app/src/main/AndroidManifest.xml

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+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+          package="com.sample.teapot"
+          android:versionCode="1"
+          android:versionName="1.0" >
+
+  <uses-feature android:glEsVersion="0x00020000"></uses-feature>
+
+  <application
+      android:allowBackup="false"
+      android:fullBackupContent="false"
+      android:supportsRtl="true"
+      android:icon="@mipmap/ic_launcher"
+      android:label="@string/app_name"
+      android:theme="@style/AppTheme"
+      android:name="com.sample.teapot.TeapotApplication"
+      >
+
+    <!-- Our activity is the built-in NativeActivity framework class.
+         This will take care of integrating with our NDK code. -->
+    <activity android:name="com.sample.teapot.TeapotNativeActivity"
+              android:label="@string/app_name"
+              android:configChanges="orientation|keyboardHidden">
+      <!-- Tell NativeActivity the name of or .so -->
+      <meta-data android:name="android.app.lib_name"
+                 android:value="TeapotNativeActivity" />
+      <intent-filter>
+        <action android:name="android.intent.action.MAIN" />
+        <category android:name="android.intent.category.LAUNCHER" />
+      </intent-filter>
+    </activity>
+  </application>
+</manifest>

Teapot/app/src/main/assets/Shaders/ShaderPlain.fsh

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+//
+// Copyright (C) 2015 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+//  ShaderPlain.fsh
+//
+
+#define USE_PHONG (1)
+
+uniform lowp vec3       vMaterialAmbient;
+uniform mediump vec4       vMaterialSpecular;
+
+varying lowp vec4 colorDiffuse;
+
+#if USE_PHONG
+uniform highp vec3      vLight0;
+varying mediump vec3 position;
+varying mediump vec3 normal;
+#else
+varying lowp vec4 colorSpecular;
+#endif
+
+void main()
+{
+#if USE_PHONG
+    mediump vec3 halfVector = normalize(-vLight0 + position);
+    mediump float NdotH = max(dot(normalize(normal), halfVector), 0.0);
+    mediump float fPower = vMaterialSpecular.w;
+    mediump float specular = pow(NdotH, fPower);
+
+    lowp vec4 colorSpecular = vec4( vMaterialSpecular.xyz * specular, 1 );
+    gl_FragColor = colorDiffuse + colorSpecular;
+#else
+    gl_FragColor = colorDiffuse + colorSpecular;
+#endif
+}

Teapot/app/src/main/assets/Shaders/VS_ShaderPlain.vsh

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+//
+// Copyright (C) 2015 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+//  ShaderPlain.vsh
+//
+
+#define USE_PHONG (1)
+
+attribute highp vec3    myVertex;
+attribute highp vec3    myNormal;
+attribute mediump vec2  myUV;
+attribute mediump vec4  myBone;
+
+varying mediump vec2    texCoord;
+varying lowp    vec4    colorDiffuse;
+
+#if USE_PHONG
+varying mediump vec3 position;
+varying mediump vec3 normal;
+#else
+varying lowp    vec4    colorSpecular;
+#endif
+
+uniform highp mat4      uMVMatrix;
+uniform highp mat4      uPMatrix;
+
+uniform highp vec3      vLight0;
+
+uniform lowp vec4       vMaterialDiffuse;
+uniform lowp vec3       vMaterialAmbient;
+uniform lowp vec4       vMaterialSpecular;
+
+void main(void)
+{
+    highp vec4 p = vec4(myVertex,1);
+    gl_Position = uPMatrix * p;
+
+    texCoord = myUV;
+
+    highp vec3 worldNormal = vec3(mat3(uMVMatrix[0].xyz, uMVMatrix[1].xyz, uMVMatrix[2].xyz) * myNormal);
+    highp vec3 ecPosition = p.xyz;
+
+    colorDiffuse = dot( worldNormal, normalize(-vLight0+ecPosition) ) * vMaterialDiffuse  + vec4( vMaterialAmbient, 1 );
+
+#if USE_PHONG
+    normal = worldNormal;
+    position = ecPosition;
+#else
+    highp vec3 halfVector = normalize(ecPosition - vLight0);
+
+    highp float NdotH = max(-dot(worldNormal, halfVector), 0.0);
+    float fPower = vMaterialSpecular.w;
+    highp float specular = min( pow(NdotH, fPower), 1.0);
+    colorSpecular = vec4( vMaterialSpecular.xyz * specular, 1 );
+#endif
+}

Teapot/app/src/main/cpp/CMakeLists.txt

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+#
+# Copyright (C)  The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+cmake_minimum_required(VERSION 3.4.1)
+
+set(CMAKE_VERBOSE_MAKEFILE on)
+
+# build native_app_glue as a static lib
+include_directories(${ANDROID_NDK}/sources/android/native_app_glue)
+add_library(app-glue STATIC
+            ${ANDROID_NDK}/sources/android/native_app_glue/android_native_app_glue.c)
+
+# now build app's shared lib
+include_directories(./ndk_helper
+                    ${ANDROID_NDK}/sources/android/cpufeatures)
+
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++11 -Wall -fno-exceptions -fno-rtti")
+file(GLOB_RECURSE teapot_SRCS ./*.c*)
+add_library(TeapotNativeActivity SHARED ${teapot_SRCS})
+
+# add lib dependencies
+target_link_libraries(TeapotNativeActivity android log EGL GLESv2 atomic app-glue)
+