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

   1 #ifndef __DALI_TOOLKIT_SHADER_EFFECT_BLIND_H__
   2 #define __DALI_TOOLKIT_SHADER_EFFECT_BLIND_H__
   3
   4 /*
   5  * Copyright (c) 2015 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/public-api/shader-effects/shader-effect.h>
  23
  24 namespace Dali
  25 {
  26
  27 namespace Toolkit
  28 {
  29
  30 /**
  31  * @brief BlindEffect is a custom shader effect to achieve blind effects in Image actors
  32  *
  33  * Animatable/Constrainable uniforms:
  34  *  "uStep" - The step of the blind effect.
  35  *
  36  * @return A handle to a newly allocated ShaderEffect
  37  */
  38
  39 inline ShaderEffect CreateBlindEffect()
  40 {
  41   std::string fragmentShader(
  42       "uniform mediump float uStep;                                                        \n"
  43       "void main()                                                                         \n"
  44       "{                                                                                   \n"
  45       "    mediump vec4 alphaColor;                                                        \n"
  46       "    mediump vec4 baseColor;                                                         \n"
  47       "    baseColor = texture2D( sTexture, vTexCoord);                                    \n"
  48       "    alphaColor = vec4(0.1,0.1,0.1,1.0);                                             \n"
  49       "    lowp float index = 0.0;                                                         \n"
  50       "    index = floor(vTexCoord.y/0.1);                                                 \n"
  51       "    if((vTexCoord.y < (index * 0.1 + uStep * 0.005)) && (vTexCoord.y > index * 0.1))\n"
  52       "    {                                                                               \n"
  53       "      gl_FragColor = alphaColor;                                                    \n"
  54       "    }                                                                               \n"
  55       "    else                                                                            \n"
  56       "    {                                                                               \n"
  57       "      gl_FragColor = baseColor;                                                     \n"
  58       "    }                                                                               \n"
  59       "    gl_FragColor*=uColor;                                                           \n"
  60       "}                                                                                   \n"
  61   );
  62
  63   Dali::ShaderEffect shaderEffect =  Dali::ShaderEffect::New(
  64       "",
  65       fragmentShader,
  66       GeometryType( GEOMETRY_TYPE_IMAGE ),
  67       ShaderEffect::GeometryHints( ShaderEffect::HINT_BLENDING | ShaderEffect::HINT_GRID ));
  68
  69   shaderEffect.SetUniform( "uStep", 0.0f );
  70
  71   return shaderEffect;
  72 }
  73
  74 } // namespace Toolkit
  75
  76 } // namespace Dali
  77
  78 #endif // __DALI_TOOLKIT_SHADER_EFFECT_BLIND_H__