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

   1 /*
   2  * Copyright (c) 2024 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 // INTERNAL INCLUDES
  30 #include <dali-toolkit/internal/graphics/builtin-shader-extern-gen.h>
  31
  32 namespace Dali
  33 {
  34 namespace Toolkit
  35 {
  36 namespace Internal
  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 } // namespace
  50
  51 Actor CreateBouncingEffectActor(Property::Index& bouncePropertyIndex)
  52 {
  53   // Create the bouncing mesh geometry
  54   struct VertexPosition
  55   {
  56     Vector3 position1;
  57     Vector3 position2;
  58   };
  59   // 4 vertices 2 triangles per layer. The depth interval between each layer is 0.01
  60   VertexPosition vertexData[20] = {
  61     // bottom layer
  62     {Vector3(-0.5f, -0.5f, 0.f), Vector3(-0.5f, -0.5f, 0.f)},
  63     {Vector3(0.5f, -0.5f, 0.f), Vector3(0.5f, -0.5f, 0.f)},
  64     {Vector3(-0.5f, -0.5f, 0.f), Vector3(-0.5f, -0.5f + LAYER_HEIGHTS[0], 0.f)},
  65     {Vector3(0.5f, -0.5f, 0.f), Vector3(0.5f, -0.5f + LAYER_HEIGHTS[0], 0.f)},
  66     // mid-bottom layer
  67     {Vector3(-0.5f, -0.5f, 0.01f), Vector3(-0.5f, -0.5f, 0.01f)},
  68     {Vector3(0.5f, -0.5f, 0.01f), Vector3(0.5f, -0.5f, 0.01f)},
  69     {Vector3(-0.5f, -0.5f, 0.01f), Vector3(-0.5f, -0.5f + LAYER_HEIGHTS[1], 0.01f)},
  70     {Vector3(0.5f, -0.5f, 0.01f), Vector3(0.5f, -0.5f + LAYER_HEIGHTS[1], 0.01f)},
  71     // middle layer
  72     {Vector3(-0.5f, -0.5f, 0.02f), Vector3(-0.5f, -0.5f, 0.02f)},
  73     {Vector3(0.5f, -0.5f, 0.02f), Vector3(0.5f, -0.5f, 0.02f)},
  74     {Vector3(-0.5f, -0.5f, 0.02f), Vector3(-0.5f, -0.5f + LAYER_HEIGHTS[2], 0.02f)},
  75     {Vector3(0.5f, -0.5f, 0.02f), Vector3(0.5f, -0.5f + LAYER_HEIGHTS[2], 0.02f)},
  76     // mid-top layer
  77     {Vector3(-0.5f, -0.5f, 0.03f), Vector3(-0.5f, -0.5f, 0.03f)},
  78     {Vector3(0.5f, -0.5f, 0.03f), Vector3(0.5f, -0.5f, 0.03f)},
  79     {Vector3(-0.5f, -0.5f, 0.03f), Vector3(-0.5f, -0.5f + LAYER_HEIGHTS[3], 0.03f)},
  80     {Vector3(0.5f, -0.5f, 0.03f), Vector3(0.5f, -0.5f + LAYER_HEIGHTS[3], 0.03f)},
  81     // top layer
  82     {Vector3(-0.5f, -0.5f, 0.04f), Vector3(-0.5f, -0.5f, 0.04f)},
  83     {Vector3(0.5f, -0.5f, 0.04f), Vector3(0.5f, -0.5f, 0.04f)},
  84     {Vector3(-0.5f, -0.5f, 0.04f), Vector3(-0.5f, -0.5f + LAYER_HEIGHTS[4], 0.04f)},
  85     {Vector3(0.5f, -0.5f, 0.04f), Vector3(0.5f, -0.5f + LAYER_HEIGHTS[4], 0.04f)}};
  86   Property::Map vertexFormat;
  87   vertexFormat["aPosition1"] = Property::VECTOR3;
  88   vertexFormat["aPosition2"] = Property::VECTOR3;
  89   VertexBuffer vertices      = VertexBuffer::New(vertexFormat);
  90   vertices.SetData(vertexData, 20u);
  91
  92   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};
  93
  94   Geometry meshGeometry = Geometry::New();
  95   meshGeometry.AddVertexBuffer(vertices);
  96   meshGeometry.SetIndexBuffer(indexData, sizeof(indexData) / sizeof(indexData[0]));
  97
  98   // Create the shader
  99   Shader shader = Shader::New(SHADER_BOUNCING_EFFECT_MESH_SHADER_VERT, SHADER_BOUNCING_EFFECT_MESH_SHADER_FRAG, Shader::Hint::NONE, "BOUNCING_EFFECT");
 100
 101   // Create renderer
 102   Renderer renderer = Renderer::New(meshGeometry, shader);
 103
 104   // Create actor
 105   Actor meshActor = Actor::New();
 106   meshActor.AddRenderer(renderer);
 107
 108   // Register property
 109   bouncePropertyIndex = meshActor.RegisterProperty("uBounceCoefficient", 0.f);
 110
 111   return meshActor;
 112 }
 113
 114 } // namespace Internal
 115
 116 } // namespace Toolkit
 117
 118 } // namespace Dali