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

   1 /*
   2  * Copyright (c) 2016 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/public-api/rendering/geometry.h>
  25 #include <dali/public-api/rendering/renderer.h>
  26 #include <dali/public-api/rendering/shader.h>
  27 #include <dali/public-api/rendering/texture-set.h>
  28
  29 namespace Dali
  30 {
  31
  32 namespace Toolkit
  33 {
  34
  35 namespace Internal
  36 {
  37
  38 namespace
  39 {
  40 // Bouncing effect is presented by stacked three layers with same color and opacity
  41 const float LAYER_HEIGHTS[5] =
  42 {
  43   1.f,
  44   26.f * 4.f/ 130.f,
  45   26.f * 3.f / 130.f,
  46   26.f * 2.f / 130.f,
  47   26.f / 130.f
  48 };
  49
  50 #define MAKE_SHADER(A)#A
  51
  52 // Modify the vertex position according to the bounce coefficient;
  53 const char* MESH_VERTEX_SHADER = MAKE_SHADER(
  54 attribute mediump vec3    aPosition1;\n
  55 attribute mediump vec3    aPosition2;\n
  56 uniform   mediump mat4    uMvpMatrix;\n
  57 uniform   mediump vec3    uSize;
  58 uniform   mediump float   uBounceCoefficient;\n
  59 \n
  60 void main()\n
  61 {\n
  62   gl_Position = uMvpMatrix * vec4(mix( aPosition1, aPosition2, abs(uBounceCoefficient) )*uSize, 1.0);\n
  63 }
  64 );
  65
  66 // use the actor color to paint every layer
  67 const char* MESH_FRAGMENT_SHADER = MAKE_SHADER(
  68 uniform lowp  vec4    uColor;\n
  69 void main()\n
  70 {\n
  71   gl_FragColor = uColor;\n
  72 }\n
  73 );
  74
  75 } // namespace Anon
  76
  77 Actor CreateBouncingEffectActor( Property::Index& bouncePropertyIndex )
  78 {
  79   // Create the bouncing mesh geometry
  80   struct VertexPosition
  81   {
  82     Vector3 position1;
  83     Vector3 position2;
  84   };
  85   // 4 vertices 2 triangles per layer. The depth interval between each layer is 0.01
  86   VertexPosition vertexData[20] = {
  87     // bottom layer
  88     { Vector3( -0.5f, -0.5f, 0.f ),  Vector3( -0.5f, -0.5f, 0.f )  },
  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 + LAYER_HEIGHTS[0], 0.f ) },
  91     { Vector3( 0.5f, -0.5f, 0.f ),   Vector3( 0.5f, -0.5f+ LAYER_HEIGHTS[0], 0.f )   },
  92     // mid-bottom layer
  93     { Vector3( -0.5f, -0.5f, 0.01f ),  Vector3( -0.5f, -0.5f, 0.01f )  },
  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 + LAYER_HEIGHTS[1], 0.01f ) },
  96     { Vector3( 0.5f, -0.5f, 0.01f ),   Vector3( 0.5f, -0.5f+ LAYER_HEIGHTS[1], 0.01f )   },
  97     // middle layer
  98     { Vector3( -0.5f, -0.5f, 0.02f ),  Vector3( -0.5f, -0.5f, 0.02f )  },
  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 + LAYER_HEIGHTS[2], 0.02f ) },
 101     { Vector3( 0.5f, -0.5f, 0.02f ),   Vector3( 0.5f, -0.5f+ LAYER_HEIGHTS[2], 0.02f )   },
 102     // mid-top layer
 103     { Vector3( -0.5f, -0.5f, 0.03f ),  Vector3( -0.5f, -0.5f, 0.03f )  },
 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 + LAYER_HEIGHTS[3], 0.03f ) },
 106     { Vector3( 0.5f, -0.5f, 0.03f ),   Vector3( 0.5f, -0.5f+ LAYER_HEIGHTS[3], 0.03f )   },
 107     // top layer
 108     { Vector3( -0.5f, -0.5f, 0.04f ),  Vector3( -0.5f, -0.5f, 0.04f )  },
 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 + LAYER_HEIGHTS[4], 0.04f ) },
 111     { Vector3( 0.5f, -0.5f, 0.04f ),   Vector3( 0.5f, -0.5f+ LAYER_HEIGHTS[4], 0.04f )   }
 112   };
 113   Property::Map vertexFormat;
 114   vertexFormat["aPosition1"] = Property::VECTOR3;
 115   vertexFormat["aPosition2"] = Property::VECTOR3;
 116   VertexBuffer vertices = VertexBuffer::New( vertexFormat );
 117   vertices.SetData( vertexData, 20u );
 118
 119   unsigned short 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};
 120
 121   Geometry meshGeometry = Geometry::New();
 122   meshGeometry.AddVertexBuffer( vertices );
 123   meshGeometry.SetIndexBuffer( indexData, sizeof(indexData)/sizeof(indexData[0]) );
 124
 125   // Create the shader
 126   Shader shader = Shader::New( MESH_VERTEX_SHADER, MESH_FRAGMENT_SHADER );
 127
 128   // Create renderer
 129   Renderer renderer = Renderer::New( meshGeometry, shader );
 130
 131   // Create actor
 132   Actor meshActor= Actor::New();
 133   meshActor.AddRenderer( renderer );
 134
 135   // Register property
 136   bouncePropertyIndex = meshActor.RegisterProperty("uBounceCoefficient", 0.f);
 137
 138   return meshActor;
 139 }
 140
 141 } // namespace Internal
 142
 143 } // namespace Toolkit
 144
 145 } // namespace Dali