optional/dali-toolkit/public-api/shader-effects/mirror-effect.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 #include <dali-toolkit/public-api/shader-effects/mirror-effect.h>
  19
  20 namespace Dali
  21 {
  22
  23 namespace Toolkit
  24 {
  25
  26 namespace
  27 {
  28
  29 const std::string DEPTH_PROPERTY_NAME( "uDepth" );
  30 const std::string ALPHA_PROPERTY_NAME( "uAlpha" );
  31
  32 } // namespace
  33
  34 MirrorEffect::MirrorEffect()
  35 {
  36 }
  37
  38 //Call the Parent copy constructor to add reference to the implementation for this object
  39 MirrorEffect::MirrorEffect(ShaderEffect handle)
  40 :ShaderEffect(handle)
  41 {
  42 }
  43
  44 MirrorEffect::~MirrorEffect()
  45 {
  46 }
  47
  48 MirrorEffect MirrorEffect::New()
  49 {
  50
  51   std::string vertextShader(
  52       "precision mediump float;                     \n"
  53       "void main()                                  \n"
  54       "{                                            \n"
  55       "  vec3 pos = aPosition;                      \n"
  56       "  pos.y = pos.y * 3.0;                       \n"
  57       "  vec4 world = uModelView * vec4(pos,1.0);   \n"
  58       "  gl_Position = uProjection * world;         \n"
  59       "  vTexCoord = aTexCoord;                     \n"
  60       "}                                            \n" );
  61
  62   std::string fragmentShader(
  63       "uniform  float  uDepth;                      \n"
  64       "uniform  float  uAlpha;                      \n"
  65       "void main()                                  \n"
  66       "{                                            \n"
  67       " if(vTexCoord.y < 1.0 / 3.0)                 \n"
  68       " {                                           \n"
  69       "   gl_FragColor = vec4(0.0, 0.0, 0.0, 0.0);  \n"
  70       " }                                           \n"
  71       " else if(vTexCoord.y < 2.0 / 3.0)            \n"
  72       " {                                           \n"
  73       "   gl_FragColor = texture2D(sTexture, vec2(vTexCoord.x, vTexCoord.y * 3.0 - 1.0)) * uColor;    \n"
  74       "   gl_FragColor.a *= uAlpha;                 \n"
  75       " }                                           \n"
  76       " else                                        \n"
  77       " {                                           \n"
  78       "   float darkness = 3.0 - vTexCoord.y * 3.0;                                                   \n"
  79       "   darkness = (1.0 - 1.0 / uDepth + darkness * 1.0/ uDepth) * 0.65;                            \n"
  80       "   vec4 color = texture2D(sTexture, vec2(vTexCoord.x, -vTexCoord.y *3.0 + 3.0)) * uColor;      \n"
  81       "   color.a *= uAlpha;                                                                          \n"
  82       "   gl_FragColor = color * vec4(darkness, darkness, darkness, darkness);                        \n"
  83       " }                                           \n"
  84       "}                                            \n" );
  85
  86   // Create the implementation, temporarily owned on stack,
  87   Dali::ShaderEffect shaderEffectCustom =  Dali::ShaderEffect::New(
  88       vertextShader,
  89       fragmentShader,
  90       GeometryType( GEOMETRY_TYPE_IMAGE ),
  91       ShaderEffect::GeometryHints( ShaderEffect::HINT_BLENDING ));
  92
  93   /* Pass ownership to MirrorEffect through overloaded constructor, So that it now has access to the
  94      Dali::ShaderEffect implementation */
  95   Dali::Toolkit::MirrorEffect handle( shaderEffectCustom );
  96   handle.SetUniform(ALPHA_PROPERTY_NAME, 1.0f);
  97   handle.SetUniform(DEPTH_PROPERTY_NAME, 0.5f);
  98   return handle;
  99 }
 100
 101 void MirrorEffect::SetDepth( float depth )
 102 {
 103   SetUniform( DEPTH_PROPERTY_NAME, depth );
 104 }
 105
 106 void MirrorEffect::SetAlpha( float alpha )
 107 {
 108   SetUniform( ALPHA_PROPERTY_NAME, alpha );
 109 }
 110
 111 const std::string& MirrorEffect::GetDepthPropertyName() const
 112 {
 113   return DEPTH_PROPERTY_NAME;
 114 }
 115
 116 const std::string& MirrorEffect::GetAlphaPropertyName() const
 117 {
 118   return ALPHA_PROPERTY_NAME;
 119 }
 120
 121 } // namespace Toolkit
 122
 123 } // namespace Dali