Rendering API example: basic light

Change-Id: Ice5ef50aa0bde7ddac16414dfac8615d76d9ec18

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+/*
+ * Copyright (c) 2017 Samsung Electronics Co., Ltd.
+ *
+ * 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.
+ *
+ */
+
+#include <dali/dali.h>
+#include <dali-toolkit/dali-toolkit.h>
+
+using namespace Dali;
+using namespace Toolkit;
+
+#define MATERIALS_MAX 24
+
+namespace
+{
+
+const char* BASIC_LIGHT_THEME( DEMO_STYLE_DIR "basic-light-theme.json" );
+const char* const CUSTOM_BASIC_LIGHT_THEME = "BasicLightButton";
+
+struct Material
+{
+    const char *name;
+    Vector3 ambient;
+    Vector3 diffuse;
+    Vector3 specular;
+    float shininess;
+};
+
+Material material[] =
+{
+        {"Emerald",        Vector3( 0.0215f,   0.1745f,   0.0215f ),   Vector3( 0.07568f,  0.61424f,    0.07568f ),    Vector3( 0.633,       0.727811f,   0.633f ),      0.6f },
+        {"Jade",           Vector3( 0.135f,    0.2225f,   0.1575f ),   Vector3( 0.54f,     0.89f,       0.63f ),       Vector3( 0.316228f,   0.316228f,   0.316228f ),   0.1f },
+        {"Obsidian",       Vector3( 0.05375f,  0.05f,     0.06625f ),  Vector3( 0.18275f,  0.17f,       0.22525f ),    Vector3( 0.332741f,   0.328634f,   0.346435f ),   0.3f },
+        {"Perl",           Vector3( 0.25f,     0.20725f,  0.20725f ),  Vector3( 1.0f,      0.829f,      0.829f ),      Vector3( 0.296648f,   0.296648f,   0.296648f ),   0.088f },
+        {"Ruby",           Vector3( 0.1745f,   0.01175f,  0.01175f ),  Vector3( 0.61424f,  0.04136f,    0.04136f ),    Vector3( 0.727811f,   0.626959f,   0.626959f ),   0.6f },
+        {"Turquoise",      Vector3( 0.1f,      0.18725f,  0.1745f ),   Vector3( 0.396f,    0.74151f,    0.69102f ),    Vector3( 0.297254,    0.30829f,    0.306678f ),   0.1f },
+        {"Brass",          Vector3( 0.329412f, 0.223529f, 0.027451f ), Vector3( 0.780392f, 0.568627f,   0.113725f ),   Vector3( 0.992157f,   0.941176f,   0.807843f ),   0.21794872f },
+        {"Bronze",         Vector3( 0.2125f,   0.1275f,   0.054f ),    Vector3( 0.714f,    0.4284f,     0.18144f ),    Vector3( 0.393548f,   0.271906f,   0.166721f ),   0.2f },
+        {"Chrome",         Vector3( 0.25f,     0.25f,     0.25f ),     Vector3( 0.4f,      0.4f,        0.4f),         Vector3( 0.774597f,   0.774597f,   0.774597f ),   0.6f },
+        {"Copper",         Vector3( 0.19125f,  0.0735f,   0.0225f ),   Vector3( 0.7038f,   0.27048f,    0.0828f ),     Vector3( 0.256777f,   0.137622f,   0.086014f ),   0.1f },
+        {"Gold",           Vector3( 0.24725f,  0.1995f,   0.0745f ),   Vector3( 0.75164f,  0.60648f,    0.22648f ),    Vector3( 0.628281f,   0.555802f,   0.366065f ),   0.4f },
+        {"Silver",         Vector3( 0.19225f,  0.19225f,  0.19225f ),  Vector3( 0.50754f,  0.50754f,    0.50754f ),    Vector3( 0.508273f,   0.508273f,   0.508273f ),   0.4f },
+        {"Black plastic",  Vector3( 0.0f,      0.0f,      0.0f ),      Vector3( 0.01f,     0.01f,       0.01f ),       Vector3( 0.50f,       0.50f,       0.50f ),       0.25f },
+        {"Cyan plastic",   Vector3( 0.0f,      0.1f,      0.06f ),     Vector3( 0.0f,      0.50980392f, 0.50980392f ), Vector3( 0.50196078f, 0.50196078f, 0.50196078f ), 0.25f },
+        {"Green plastic",  Vector3( 0.0f,      0.0f,      0.0f ),      Vector3( 0.1f,      0.35f,       0.1f ),        Vector3( 0.45,        0.55,        0.45 ),        0.25f },
+        {"Red plastic",    Vector3( 0.0f,      0.0f,      0.0f ),      Vector3( 0.5f,      0.0f,        0.0f ),        Vector3( 0.7f,        0.6f,        0.6f ),        0.25f },
+        {"White plastic",  Vector3( 0.0f,      0.0f,      0.0f ),      Vector3( 0.55f,     0.55f,       0.55f ),       Vector3( 0.7f,        0.7f,        0.7f ),        0.25f },
+        {"Yellow plastic", Vector3( 0.0f,      0.0f,      0.0f ),      Vector3( 0.5f,      0.5f,        0.0f ),        Vector3( 0.6f,        0.6f,        0.5f ),        0.25f },
+        {"Black rubber",   Vector3( 0.02f,     0.02f,     0.02f ),     Vector3( 0.01f,     0.01f,       0.01f ),       Vector3( 0.4f,        0.4f,        0.4f ),        0.078125f },
+        {"Cyan rubber",    Vector3( 0.0f,      0.05f,     0.05f ),     Vector3( 0.4f,      0.5f,        0.5f ),        Vector3( 0.04f,       0.7f,        0.7f ),        0.078125f },
+        {"Green rubber",   Vector3( 0.0f,      0.05f,     0.0f ),      Vector3( 0.4f,      0.5f,        0.4f ),        Vector3( 0.04f,       0.7f,        0.04f ),       0.078125f },
+        {"Red rubber",     Vector3( 0.05f,     0.0f,      0.0f ),      Vector3( 0.5f,      0.4f,        0.4f ),        Vector3( 0.7f,        0.04f,       0.04f ),       0.078125f },
+        {"White rubber",   Vector3( 0.05f,     0.05f,     0.05f ),     Vector3( 0.5f,      0.5f,        0.5f ),        Vector3( 0.7f,        0.7f,        0.7f ),        0.078125f },
+        {"Yellow rubber",  Vector3( 0.05f,     0.05f,     0.0f ),      Vector3( 0.5f,      0.5f,        0.4f ),        Vector3( 0.7f,        0.7f,        0.04f ),       0.078125f }
+};
+
+int MaterialID = 0;
+
+/*
+ * Vertex shader
+ */
+const char* VERTEX_SHADER = DALI_COMPOSE_SHADER(
+attribute mediump vec3 aPosition;\n // DALi shader builtin
+attribute mediump vec3 aNormal;\n // DALi shader builtin
+uniform   mediump mat4 uMvpMatrix;\n // DALi shader builtin
+uniform   mediump vec3 uSize;\n // DALi shader builtin
+uniform   mediump mat4 uModelView;\n // DALi shader builtin
+uniform   mediump mat3 uNormalMatrix;\n // DALi shader builtin
+\n
+varying mediump vec3 vNormal;\n
+varying mediump vec3 vFragPos;\n
+\n
+void main()\n
+{\n
+  mediump vec4 vertexPosition = vec4(aPosition, 1.0);\n
+  vertexPosition.xyz *= uSize;\n
+  vFragPos = vec3(uModelView * vertexPosition);\n
+  vNormal = uNormalMatrix * aNormal;\n
+  \n
+  gl_Position = uMvpMatrix * vertexPosition;\n
+}\n
+);
+
+/*
+ * Fragment shader
+ */
+const char* FRAGMENT_SHADER = DALI_COMPOSE_SHADER(
+varying mediump vec3 vNormal;\n
+varying mediump vec3 vFragPos;\n
+uniform mediump  vec3 viewPos;\n // custom uniform
+\n
+struct Material {\n
+    mediump vec3 ambient;\n
+    mediump vec3 diffuse;\n
+    mediump vec3 specular;\n
+    mediump float shininess;\n
+};\n
+struct Light {\n
+    mediump vec3 position;\n
+    mediump vec3 color;\n
+};\n
+uniform Material material;\n // custom uniform
+uniform Light light;\n  // custom uniform
+\n
+void main()\n
+{\n
+\n    // Ambient
+    mediump vec3 ambient = material.ambient * light.color;\n
+\n    // Diffuse
+    mediump vec3 norm = normalize(vNormal);\n
+    mediump vec3 lightDir = normalize(light.position - vFragPos);\n
+    mediump float diff = max(dot(norm, lightDir), 0.0);\n
+    mediump vec3 diffuse = material.diffuse * diff * light.color;\n
+    \n
+\n    // Specular
+    mediump vec3 viewDir = normalize(viewPos - vFragPos);\n
+    mediump vec3 reflectDir = reflect(-lightDir, norm);  \n
+    mediump float spec = pow(max(dot(viewDir, reflectDir), 0.0), material.shininess);\n
+    mediump vec3 specular = material.specular * spec * light.color;  \n
+    mediump vec3 result = (ambient + diffuse + specular);\n
+    gl_FragColor = vec4(result, 1.0);\n
+}\n
+);
+
+}
+
+// This example shows per-pixel lighting of materials with different ambient, diffuse, specular and shininess parameters
+//
+class BasicLightController : public ConnectionTracker
+{
+public:
+
+  BasicLightController( Application& application )
+  : mApplication( application )
+  {
+    // Connect to the Application's Init signal
+    mApplication.InitSignal().Connect( this, &BasicLightController::Create );
+  }
+
+  ~BasicLightController()
+  {
+    // Nothing to do here;
+  }
+
+  // The Init signal is received once (only) during the Application lifetime
+  void Create( Application& application )
+  {
+    // Get a handle to the stage
+    Stage stage = Stage::GetCurrent();
+    stage.SetBackgroundColor( Color::BLACK );
+    mLabel = TextLabel::New( material[MaterialID].name );
+    mLabel.SetAnchorPoint( AnchorPoint::TOP_CENTER );
+    mLabel.SetParentOrigin( Vector3( 0.5f, 0.0f, 0.5f ) );
+    mLabel.SetSize( stage.GetSize().x * 0.5f, stage.GetSize().y * 0.083f );
+    mLabel.SetProperty( TextLabel::Property::HORIZONTAL_ALIGNMENT, "CENTER" );
+    mLabel.SetProperty( TextLabel::Property::VERTICAL_ALIGNMENT, "CENTER" );
+    mLabel.SetProperty( TextLabel::Property::TEXT_COLOR, Vector4( 1.0f, 1.0f, 1.0f, 1.0f ));
+    stage.Add( mLabel );
+    mButton = PushButton::New();
+    mButton.SetProperty( Button::Property::LABEL, "Exit" );
+    mButton.SetParentOrigin( ParentOrigin::CENTER );
+    mButton.SetAnchorPoint( AnchorPoint::CENTER );
+    mButton.ClickedSignal().Connect( this, &BasicLightController::OnExit );
+    mButton.SetParentOrigin( Vector3( 0.5f, 0.1f, 0.5f ) );
+    mButton.SetStyleName(CUSTOM_BASIC_LIGHT_THEME);
+    mButton.SetColor( Vector4( material[MaterialID].diffuse) + Vector4( 0.0f, 0.0f, 0.0f, 1.0f ) );
+    stage.Add(mButton);
+
+    // Step 1. Create shader
+    CreateCubeShader();
+
+    // Step 2. Prepare geometry
+    CreateCubeGeometry();
+
+    // Step 3. Create a renderer
+    CreateRenderer();
+
+    // Step 4. Create an Actor
+    CreateActor();
+
+    // Step 5. Play animation to rotate the cube
+    PlayAnimation();
+
+    // Respond to a click anywhere on the stage
+    stage.GetRootLayer().TouchSignal().Connect( this, &BasicLightController::OnTouch );
+
+    // Respond to key events
+    stage.KeyEventSignal().Connect( this, &BasicLightController::OnKeyEvent );
+  }
+
+  /**
+   * This function will change the material of the cube when touched
+   */
+  bool OnTouch( Actor actor, const TouchData& touch )
+  {
+    if(touch.GetState(0) == PointState::UP)
+    {
+        MaterialID++;
+        MaterialID %= MATERIALS_MAX;
+
+        mShader.SetProperty( mShader.GetPropertyIndex( "material.ambient" ), material[MaterialID].ambient );
+        mShader.SetProperty( mShader.GetPropertyIndex( "material.diffuse" ), material[MaterialID].diffuse );
+        mShader.SetProperty( mShader.GetPropertyIndex( "material.specular" ), material[MaterialID].specular );
+        mShader.SetProperty( mShader.GetPropertyIndex( "material.shininess" ), material[MaterialID].shininess * 128.0f );
+        mLabel.SetProperty( TextLabel::Property::TEXT, material[MaterialID].name );
+        mButton.SetColor( Vector4(material[MaterialID].diffuse) + Vector4(0.0f, 0.0f, 0.0f, 1.0f) );
+    }
+    return true;
+  }
+
+  /**
+   * This function will the terminate the application when the exit button is pressed
+   */
+  bool OnExit( Button button )
+  {
+      mApplication.Quit();
+      return true;
+  }
+
+  /**
+   * @brief Called when any key event is received
+   *
+   * Will use this to quit the application if Back or the Escape key is received
+   * @param[in] event The key event information
+   */
+  void OnKeyEvent( const KeyEvent& event )
+  {
+    if( event.state == KeyEvent::Down )
+    {
+      if ( IsKey( event, Dali::DALI_KEY_ESCAPE ) || IsKey( event, Dali::DALI_KEY_BACK ) )
+      {
+        mApplication.Quit();
+      }
+    }
+  }
+
+  /**
+   * This function creates a cube geometry including texture coordinates.
+   * Also it demonstrates using the indexed draw feature by setting an index array.
+   */
+  void CreateCubeGeometry()
+  {
+    struct Vertex
+    {
+      Vector3 aPosition;
+      Vector3 aNormal;
+    };
+
+    const Vector3 NORMAL0(-1.0f, 0.0f, 0.0f );
+    const Vector3 NORMAL1( 0.0f, 1.0f, 0.0f );
+    const Vector3 NORMAL2( 0.0f,-1.0f, 0.0f );
+    const Vector3 NORMAL3( 0.0f, 0.0f, 1.0f );
+    const Vector3 NORMAL4( 1.0f, 0.0f, 0.0f );
+    const Vector3 NORMAL5( 0.0f, 0.0f,-1.0f );
+
+    Vertex vertices[] = {
+      { Vector3(  1.0f,-1.0f,-1.0f ), NORMAL5 },
+      { Vector3( -1.0f, 1.0f,-1.0f ), NORMAL5 },
+      { Vector3(  1.0f, 1.0f,-1.0f ), NORMAL5 },
+      { Vector3( -1.0f, 1.0f, 1.0f ), NORMAL3 },
+      { Vector3(  1.0f,-1.0f, 1.0f ), NORMAL3 },
+      { Vector3(  1.0f, 1.0f, 1.0f ), NORMAL3 },
+      { Vector3(  1.0f, 1.0f, 1.0f ), NORMAL4 },
+      { Vector3(  1.0f,-1.0f,-1.0f ), NORMAL4 },
+      { Vector3(  1.0f, 1.0f,-1.0f ), NORMAL4 },
+      { Vector3(  1.0f,-1.0f, 1.0f ), NORMAL1 },
+      { Vector3( -1.0f,-1.0f,-1.0f ), NORMAL1 },
+      { Vector3(  1.0f,-1.0f,-1.0f ), NORMAL1 },
+      { Vector3( -1.0f,-1.0f,-1.0f ), NORMAL0 },
+      { Vector3( -1.0f, 1.0f, 1.0f ), NORMAL0 },
+      { Vector3( -1.0f, 1.0f,-1.0f ), NORMAL0 },
+      { Vector3(  1.0f, 1.0f,-1.0f ), NORMAL2 },
+      { Vector3( -1.0f, 1.0f, 1.0f ), NORMAL2 },
+      { Vector3(  1.0f, 1.0f, 1.0f ), NORMAL2 },
+      { Vector3(  1.0f,-1.0f,-1.0f ), NORMAL5 },
+      { Vector3( -1.0f,-1.0f,-1.0f ), NORMAL5 },
+      { Vector3( -1.0f, 1.0f,-1.0f ), NORMAL5 },
+      { Vector3( -1.0f, 1.0f, 1.0f ), NORMAL3 },
+      { Vector3( -1.0f,-1.0f, 1.0f ), NORMAL3 },
+      { Vector3(  1.0f,-1.0f, 1.0f ), NORMAL3 },
+      { Vector3(  1.0f, 1.0f, 1.0f ), NORMAL4 },
+      { Vector3(  1.0f,-1.0f, 1.0f ), NORMAL4 },
+      { Vector3(  1.0f,-1.0f,-1.0f ), NORMAL4 },
+      { Vector3(  1.0f,-1.0f, 1.0f ), NORMAL1 },
+      { Vector3( -1.0f,-1.0f, 1.0f ), NORMAL1 },
+      { Vector3( -1.0f,-1.0f,-1.0f ), NORMAL1 },
+      { Vector3( -1.0f,-1.0f,-1.0f ), NORMAL0 },
+      { Vector3( -1.0f,-1.0f, 1.0f ), NORMAL0 },
+      { Vector3( -1.0f, 1.0f, 1.0f ), NORMAL0 },
+      { Vector3(  1.0f, 1.0f,-1.0f ), NORMAL2 },
+      { Vector3( -1.0f, 1.0f,-1.0f ), NORMAL2 },
+      { Vector3( -1.0f, 1.0f, 1.0f ), NORMAL2 },
+    };
+
+    Property::Map property;
+    property.Insert( "aPosition", Property::VECTOR3 );
+    property.Insert( "aNormal", Property::VECTOR3 );
+
+    PropertyBuffer vertexBuffer = PropertyBuffer::New( property );
+
+    vertexBuffer.SetData( vertices, sizeof(vertices) / sizeof(Vertex) );
+
+    // create indices
+    const unsigned short INDEX_CUBE[] = {
+      2, 1, 0,
+      5, 4, 3,
+      8, 7, 6,
+      11, 10, 9,
+      14, 13, 12,
+      17, 16, 15,
+      20, 19, 18,
+      23, 22, 21,
+      26, 25, 24,
+      29, 28, 27,
+      32, 31, 30,
+      35, 34, 33
+    };
+    mGeometry = Geometry::New();
+    mGeometry.AddVertexBuffer( vertexBuffer );
+    mGeometry.SetIndexBuffer( INDEX_CUBE,
+                              sizeof(INDEX_CUBE)/sizeof(INDEX_CUBE[0])
+        );
+    mGeometry.SetType( Geometry::TRIANGLES );
+  }
+
+  /**
+   * Creates a shader using inlined variable VERTEX_SHADER and FRAGMENT_SHADER
+   *
+   * Shaders are very basic and all they do is transforming vertices and interpolating
+   * input per-vertex color.
+   */
+  void CreateCubeShader()
+  {
+    mShader = Shader::New( VERTEX_SHADER, FRAGMENT_SHADER );
+
+    float scale = 120.0f;
+    mShader.RegisterProperty( "light.position",Vector3( 1.2 * scale, scale, 2.0 * scale ) );
+    mShader.RegisterProperty( "light.color", Vector3( 1.0f, 1.0f, 1.0f ) );
+    mShader.RegisterProperty( "viewPos", Vector3( 0, 0, 3.0 * scale ) );
+
+    mShader.RegisterProperty( "material.ambient", material[MaterialID].ambient );
+    mShader.RegisterProperty( "material.diffuse", material[MaterialID].diffuse );
+    mShader.RegisterProperty( "material.specular", material[MaterialID].specular );
+    mShader.RegisterProperty( "material.shininess", material[MaterialID].shininess * 128.0f );
+  }
+
+  /**
+   * Function creates renderer. It turns on depth test and depth write.
+   */
+  void CreateRenderer()
+  {
+    mRenderer = Renderer::New( mGeometry, mShader );
+
+    // Face culling is enabled to hide the backwards facing sides of the cube
+    // This is sufficient to render a single object; for more complex scenes depth-testing might be required
+    mRenderer.SetProperty( Renderer::Property::FACE_CULLING_MODE, FaceCullingMode::BACK );
+  }
+
+  /**
+   * Creates new actor and attaches renderer.
+   */
+  void CreateActor()
+  {
+    Stage stage = Stage::GetCurrent();
+
+    float quarterStageWidth = stage.GetSize().x * 0.25f;
+    mActor = Actor::New();
+    mActor.SetColor( Vector4( 1.0f, 1.0f, 0.6f, 1.0f ) );
+    mActor.SetAnchorPoint( AnchorPoint::CENTER );
+    mActor.SetParentOrigin( ParentOrigin::CENTER );
+    mActor.SetSize( Vector3( quarterStageWidth, quarterStageWidth, quarterStageWidth ) );
+    mActor.AddRenderer( mRenderer );
+    stage.Add( mActor );
+  }
+
+  /**
+   * Plays animation
+   */
+  void PlayAnimation()
+  {
+    mAnimation = Animation::New( 15.0f );
+    mAnimation.SetLooping( true );
+    mAnimation.AnimateBy( Property( mActor, Actor::Property::ORIENTATION ), Quaternion( Radian( Degree( 360 )), Vector3::ZAXIS ) );
+    mAnimation.AnimateBy( Property( mActor, Actor::Property::ORIENTATION ), Quaternion( Radian( Degree( 360 )), Vector3::YAXIS ) );
+    mAnimation.AnimateBy( Property( mActor, Actor::Property::ORIENTATION ), Quaternion( Radian( Degree( 360 )), Vector3::XAXIS ) );
+    mAnimation.Play();
+  }
+
+private:
+  Application&  mApplication;
+  TextLabel mLabel;
+  PushButton mButton;
+  Renderer mRenderer;
+  Shader mShader;
+  Geometry mGeometry;
+  Actor mActor;
+  Animation mAnimation;
+};
+
+void RunTest( Application& application )
+{
+  BasicLightController test( application );
+
+  application.MainLoop();
+}
+
+// Entry point for Linux & Tizen applications
+//
+int DALI_EXPORT_API main( int argc, char **argv )
+{
+  Application application = Application::New( &argc, &argv, BASIC_LIGHT_THEME);
+
+  RunTest( application );
+
+  return 0;
+}