dali-toolkit/internal/controls/scrollable/bouncing-effect-actor.cpp

   1 /*
   2  * Copyright (c) 2014 Samsung Electronics Co., Ltd.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  *
  16  */
  17
  18 // CLASS HEADER
  19 #include <dali-toolkit/internal/controls/scrollable/bouncing-effect-actor.h>
  20
  21 // EXTERNAL INCLUDES
  22 #include <dali/public-api/math/vector3.h>
  23 #include <dali/public-api/object/property-map.h>
  24 #include <dali/devel-api/object/property-buffer.h>
  25 #include <dali/devel-api/rendering/geometry.h>
  26 #include <dali/devel-api/rendering/material.h>
  27 #include <dali/devel-api/rendering/renderer.h>
  28 #include <dali/devel-api/rendering/shader.h>
  29
  30 namespace Dali
  31 {
  32
  33 namespace Toolkit
  34 {
  35
  36 namespace Internal
  37 {
  38
  39 namespace
  40 {
  41 // Bouncing effect is presented by stacked three layers with same color and opacity
  42 const float LAYER_HEIGHTS[5] =
  43 {
  44   1.f,
  45   26.f * 4.f/ 130.f,
  46   26.f * 3.f / 130.f,
  47   26.f * 2.f / 130.f,
  48   26.f / 130.f
  49 };
  50
  51 #define MAKE_SHADER(A)#A
  52
  53 // Modify the vertex position according to the bounce coefficient;
  54 const char* MESH_VERTEX_SHADER = MAKE_SHADER(
  55 attribute mediump vec3    aPosition1;\n
  56 attribute mediump vec3    aPosition2;\n
  57 uniform   mediump mat4    uMvpMatrix;\n
  58 uniform   mediump vec3    uSize;
  59 uniform   mediump float   uBounceCoefficient;\n
  60 \n
  61 void main()\n
  62 {\n
  63   gl_Position = uMvpMatrix * vec4(mix( aPosition1, aPosition2, abs(uBounceCoefficient) )*uSize, 1.0);\n
  64 }
  65 );
  66
  67 // use the actor color to paint every layer
  68 const char* MESH_FRAGMENT_SHADER = MAKE_SHADER(
  69 uniform lowp  vec4    uColor;\n
  70 void main()\n
  71 {\n
  72   gl_FragColor = uColor;\n
  73 }\n
  74 );
  75
  76 } // namespace Anon
  77
  78 Actor CreateBouncingEffectActor( Property::Index& bouncePropertyIndex )
  79 {
  80   // Create the bouncing mesh geometry
  81   struct VertexPosition
  82   {
  83     Vector3 position1;
  84     Vector3 position2;
  85   };
  86   // 4 vertices 2 triangles per layer. The depth interval between each layer is 0.01
  87   VertexPosition vertexData[20] = {
  88     // bottom layer
  89     { Vector3( -0.5f, -0.5f, 0.f ),  Vector3( -0.5f, -0.5f, 0.f )  },
  90     { Vector3( 0.5f, -0.5f, 0.f ),   Vector3( 0.5f, -0.5f, 0.f )   },
  91     { Vector3( -0.5f, -0.5f, 0.f ),  Vector3( -0.5f, -0.5f + LAYER_HEIGHTS[0], 0.f ) },
  92     { Vector3( 0.5f, -0.5f, 0.f ),   Vector3( 0.5f, -0.5f+ LAYER_HEIGHTS[0], 0.f )   },
  93     // mid-bottom layer
  94     { Vector3( -0.5f, -0.5f, 0.01f ),  Vector3( -0.5f, -0.5f, 0.01f )  },
  95     { Vector3( 0.5f, -0.5f, 0.01f ),   Vector3( 0.5f, -0.5f, 0.01f )   },
  96     { Vector3( -0.5f, -0.5f, 0.01f ),  Vector3( -0.5f, -0.5f + LAYER_HEIGHTS[1], 0.01f ) },
  97     { Vector3( 0.5f, -0.5f, 0.01f ),   Vector3( 0.5f, -0.5f+ LAYER_HEIGHTS[1], 0.01f )   },
  98     // middle layer
  99     { Vector3( -0.5f, -0.5f, 0.02f ),  Vector3( -0.5f, -0.5f, 0.02f )  },
 100     { Vector3( 0.5f, -0.5f, 0.02f ),   Vector3( 0.5f, -0.5f, 0.02f )   },
 101     { Vector3( -0.5f, -0.5f, 0.02f ),  Vector3( -0.5f, -0.5f + LAYER_HEIGHTS[2], 0.02f ) },
 102     { Vector3( 0.5f, -0.5f, 0.02f ),   Vector3( 0.5f, -0.5f+ LAYER_HEIGHTS[2], 0.02f )   },
 103     // mid-top layer
 104     { Vector3( -0.5f, -0.5f, 0.03f ),  Vector3( -0.5f, -0.5f, 0.03f )  },
 105     { Vector3( 0.5f, -0.5f, 0.03f ),   Vector3( 0.5f, -0.5f, 0.03f )   },
 106     { Vector3( -0.5f, -0.5f, 0.03f ),  Vector3( -0.5f, -0.5f + LAYER_HEIGHTS[3], 0.03f ) },
 107     { Vector3( 0.5f, -0.5f, 0.03f ),   Vector3( 0.5f, -0.5f+ LAYER_HEIGHTS[3], 0.03f )   },
 108     // top layer
 109     { Vector3( -0.5f, -0.5f, 0.04f ),  Vector3( -0.5f, -0.5f, 0.04f )  },
 110     { Vector3( 0.5f, -0.5f, 0.04f ),   Vector3( 0.5f, -0.5f, 0.04f )   },
 111     { Vector3( -0.5f, -0.5f, 0.04f ),  Vector3( -0.5f, -0.5f + LAYER_HEIGHTS[4], 0.04f ) },
 112     { Vector3( 0.5f, -0.5f, 0.04f ),   Vector3( 0.5f, -0.5f+ LAYER_HEIGHTS[4], 0.04f )   }
 113   };
 114   Property::Map vertexFormat;
 115   vertexFormat["aPosition1"] = Property::VECTOR3;
 116   vertexFormat["aPosition2"] = Property::VECTOR3;
 117   PropertyBuffer vertices = PropertyBuffer::New( vertexFormat, 20u );
 118   vertices.SetData( vertexData );
 119
 120   unsigned int indexData[30] = { 0,3,1,0,2,3,4,7,5,4,6,7,8,11,9,8,10,11,12,15,13,12,14,15,16,19,17,16,18,19};
 121   Property::Map indexFormat;
 122   indexFormat["indices"] = Property::INTEGER;
 123   PropertyBuffer indices = PropertyBuffer::New( indexFormat, 30u );
 124   indices.SetData( indexData );
 125
 126   Geometry meshGeometry = Geometry::New();
 127   meshGeometry.AddVertexBuffer( vertices );
 128   meshGeometry.SetIndexBuffer( indices );
 129
 130   // Create material
 131   Shader shader = Shader::New( MESH_VERTEX_SHADER, MESH_FRAGMENT_SHADER );
 132   Material material = Material::New( shader );
 133
 134   // Create renderer
 135   Renderer renderer = Renderer::New( meshGeometry, material );
 136
 137   // Create actor
 138   Actor meshActor= Actor::New();
 139   meshActor.AddRenderer( renderer );
 140
 141   // Register property
 142   bouncePropertyIndex = meshActor.RegisterProperty("uBounceCoefficient", 0.f);
 143
 144   return meshActor;
 145 }
 146
 147 } // namespace Internal
 148
 149 } // namespace Toolkit
 150
 151 } // namespace Dali