dali-toolkit/devel-api/shader-effects/mirror-effect.h

   1 #ifndef __DALI_TOOLKIT_MIRROR_EFFECT_H__
   2 #define __DALI_TOOLKIT_MIRROR_EFFECT_H__
   3
   4 /*
   5  * Copyright (c) 2016 Samsung Electronics Co., Ltd.
   6  *
   7  * Licensed under the Apache License, Version 2.0 (the "License");
   8  * you may not use this file except in compliance with the License.
   9  * You may obtain a copy of the License at
  10  *
  11  * http://www.apache.org/licenses/LICENSE-2.0
  12  *
  13  * Unless required by applicable law or agreed to in writing, software
  14  * distributed under the License is distributed on an "AS IS" BASIS,
  15  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  16  * See the License for the specific language governing permissions and
  17  * limitations under the License.
  18  *
  19  */
  20
  21 // EXTERNAL INCLUDES
  22 #include <dali/devel-api/shader-effects/shader-effect.h>
  23
  24 namespace Dali
  25 {
  26
  27 namespace Toolkit
  28 {
  29
  30 /**
  31  * @brief Creates a new MirrorEffect
  32  *
  33  * MirrorEffect is a custom shader effect to achieve square effects in Image actors
  34  *
  35  * Animatable/Constrainable uniforms:
  36  *  "uDepth"  - The depth of the mirror effect. Default value 0.5
  37  *  "uAlpha"  - The alpha of the mirror effect. Default value 1.0
  38  *
  39  * @return A handle to a newly allocated ShaderEffect
  40  */
  41 inline ShaderEffect CreateMirrorEffect()
  42 {
  43   std::string vertexShader(
  44       "void main()                                  \n"
  45       "{                                            \n"
  46       "  mediump vec3 pos = aPosition;              \n"
  47       "  pos.y = pos.y * 3.0;                       \n"
  48       "  mediump vec4 world = uModelView * vec4(pos,1.0); \n"
  49       "  gl_Position = uProjection * world;         \n"
  50       "  vTexCoord = mix( sTextureRect.xy, sTextureRect.zw, aTexCoord ); \n"
  51       "}                                            \n" );
  52
  53   std::string fragmentShader(
  54       "uniform  mediump float  uDepth;              \n"
  55       "uniform  mediump float  uAlpha;              \n"
  56       "void main()                                  \n"
  57       "{                                            \n"
  58       " if(vTexCoord.y < 1.0 / 3.0)                 \n"
  59       " {                                           \n"
  60       "   gl_FragColor = vec4(0.0, 0.0, 0.0, 0.0);  \n"
  61       " }                                           \n"
  62       " else if(vTexCoord.y < 2.0 / 3.0)            \n"
  63       " {                                           \n"
  64       "   gl_FragColor = texture2D(sTexture, vec2(vTexCoord.x, vTexCoord.y * 3.0 - 1.0)) * uColor;    \n"
  65       "   gl_FragColor.a *= uAlpha;                 \n"
  66       " }                                           \n"
  67       " else                                        \n"
  68       " {                                           \n"
  69       "   highp float darkness = 3.0 - vTexCoord.y * 3.0;                                                   \n"
  70       "   darkness = (1.0 - 1.0 / uDepth + darkness * 1.0/ uDepth) * 0.65;                            \n"
  71       "   highp vec4 color = texture2D(sTexture, vec2(vTexCoord.x, -vTexCoord.y *3.0 + 3.0)) * uColor;      \n"
  72       "   color.a *= uAlpha;                                                                          \n"
  73       "   gl_FragColor = color * vec4(darkness, darkness, darkness, darkness);                        \n"
  74       " }                                           \n"
  75       "}                                            \n" );
  76
  77   Dali::ShaderEffect shaderEffect =  Dali::ShaderEffect::New(
  78       vertexShader,
  79       fragmentShader,
  80       ShaderEffect::GeometryHints( ShaderEffect::HINT_BLENDING ));
  81
  82   shaderEffect.SetUniform("uAlpha", 1.0f);
  83   shaderEffect.SetUniform("uDepth", 0.5f);
  84
  85   return shaderEffect;
  86 }
  87
  88
  89 } // namespace Toolkit
  90
  91 } // namespace Dali
  92
  93 #endif // __DALI_TOOLKIT_MIRROR_EFFECT_H__