dali-toolkit/devel-api/shader-effects/motion-blur-effect.cpp

   1 /*
   2  * Copyright (c) 2021 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 // CLASS HEADER
  18 #include <dali-toolkit/devel-api/shader-effects/motion-blur-effect.h>
  19
  20 // EXTERNAL INCLUDES
  21 #include <dali/public-api/animation/constraints.h>
  22 #include <dali/public-api/rendering/shader.h>
  23
  24 // INTERNAL INCLUDES
  25 #include <dali-toolkit/internal/graphics/builtin-shader-extern-gen.h>
  26 #include <dali-toolkit/public-api/visuals/visual-properties.h>
  27
  28 namespace Dali
  29 {
  30 namespace Toolkit
  31 {
  32 void SetMotionBlurProperties(Actor& actor, unsigned int numBlurSamples)
  33 {
  34   actor.RegisterProperty("uBlurTexCoordScale", 0.125f);
  35   actor.RegisterProperty("uGeometryStretchFactor", 0.05f);
  36   actor.RegisterProperty("uSpeedScalingFactor", 0.5f);
  37   actor.RegisterProperty("uObjectFadeStart", Vector2(0.25f, 0.25f));
  38   actor.RegisterProperty("uObjectFadeEnd", Vector2(0.5f, 0.5f));
  39   actor.RegisterProperty("uAlphaScale", 0.75f);
  40   actor.RegisterProperty("uNumSamples", static_cast<float>(numBlurSamples));
  41   actor.RegisterProperty("uRecipNumSamples", 1.0f / static_cast<float>(numBlurSamples));
  42   actor.RegisterProperty("uRecipNumSamplesMinusOne", 1.0f / static_cast<float>(numBlurSamples - 1.0f));
  43   Property::Index uModelProperty = actor.RegisterProperty("uModelLastFrame", Matrix::IDENTITY);
  44
  45   Constraint constraint = Constraint::New<Matrix>(actor, uModelProperty, EqualToConstraint());
  46   constraint.AddSource(Source(actor, Actor::Property::WORLD_MATRIX));
  47   constraint.Apply();
  48 }
  49
  50 Property::Map CreateMotionBlurEffect()
  51 {
  52   Property::Map map;
  53
  54   Property::Map customShader;
  55   customShader[Visual::Shader::Property::VERTEX_SHADER]   = SHADER_MOTION_BLUR_EFFECT_VERT.data();
  56   customShader[Visual::Shader::Property::FRAGMENT_SHADER] = SHADER_MOTION_BLUR_EFFECT_FRAG.data();
  57
  58   customShader[Visual::Shader::Property::SUBDIVIDE_GRID_X] = 10;
  59   customShader[Visual::Shader::Property::SUBDIVIDE_GRID_Y] = 10;
  60
  61   customShader[Visual::Shader::Property::HINTS] = Shader::Hint::OUTPUT_IS_TRANSPARENT;
  62
  63   map[Toolkit::Visual::Property::SHADER] = customShader;
  64   return map;
  65 }
  66
  67 } // namespace Toolkit
  68 } // namespace Dali