dali-toolkit/internal/visuals/image-visual-shader-factory.cpp

   1 /*
   2  * Copyright (c) 2023 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/internal/visuals/image-visual-shader-factory.h>
  19
  20 // EXTERNAL INCLUDES
  21 #include <dali/devel-api/rendering/texture-devel.h>
  22
  23 // INTERNAL INCLUDES
  24 #include <dali-toolkit/internal/graphics/builtin-shader-extern-gen.h>
  25 #include <dali-toolkit/internal/visuals/visual-string-constants.h>
  26 #include <dali/integration-api/debug.h>
  27
  28 namespace Dali
  29 {
  30 namespace Toolkit
  31 {
  32 namespace Internal
  33 {
  34 namespace
  35 {
  36 const Vector4 FULL_TEXTURE_RECT(0.f, 0.f, 1.f, 1.f);
  37
  38 const int NATIVE_SHADER_TYPE_OFFSET = VisualFactoryCache::ShaderType::NATIVE_IMAGE_SHADER - VisualFactoryCache::ShaderType::IMAGE_SHADER;
  39 } // unnamed namespace
  40
  41 ImageVisualShaderFactory::ImageVisualShaderFactory()
  42 : mFragmentShaderNeedChange(ImageVisualShaderFeature::ChangeFragmentShader::UNDECIDED)
  43 {
  44 }
  45
  46 ImageVisualShaderFactory::~ImageVisualShaderFactory()
  47 {
  48 }
  49
  50 Shader ImageVisualShaderFactory::GetShader(VisualFactoryCache& factoryCache, ImageVisualShaderFeatureBuilder& featureBuilder)
  51 {
  52   Shader                         shader;
  53   VisualFactoryCache::ShaderType shaderType = featureBuilder.GetShaderType();
  54
  55   if(featureBuilder.NeedToChangeFragmentShader() == ImageVisualShaderFeature::ChangeFragmentShader::NEED_CHANGE &&
  56      (mFragmentShaderNeedChange == ImageVisualShaderFeature::ChangeFragmentShader::UNDECIDED ||
  57       mFragmentShaderNeedChange == ImageVisualShaderFeature::ChangeFragmentShader::NEED_CHANGE))
  58   {
  59     shaderType = static_cast<VisualFactoryCache::ShaderType>(static_cast<int>(shaderType) + NATIVE_SHADER_TYPE_OFFSET);
  60   }
  61
  62   shader = factoryCache.GetShader(shaderType);
  63   if(shader)
  64   {
  65     return shader;
  66   }
  67
  68   std::string vertexShaderPrefixList;
  69   std::string fragmentShaderPrefixList;
  70   featureBuilder.GetVertexShaderPrefixList(vertexShaderPrefixList);
  71   featureBuilder.GetFragmentShaderPrefixList(fragmentShaderPrefixList);
  72
  73   std::string vertexShader   = std::string(Dali::Shader::GetVertexShaderPrefix() + vertexShaderPrefixList + SHADER_IMAGE_VISUAL_SHADER_VERT.data());
  74   std::string fragmentShader = std::string(Dali::Shader::GetFragmentShaderPrefix() + fragmentShaderPrefixList + SHADER_IMAGE_VISUAL_SHADER_FRAG.data());
  75
  76   if(featureBuilder.NeedToChangeFragmentShader() == ImageVisualShaderFeature::ChangeFragmentShader::NEED_CHANGE)
  77   {
  78     bool modified = DevelTexture::ApplyNativeFragmentShader(featureBuilder.GetTexture(), fragmentShader);
  79     if(mFragmentShaderNeedChange == ImageVisualShaderFeature::ChangeFragmentShader::NEED_CHANGE)
  80     {
  81       DALI_ASSERT_ALWAYS(modified && "NativeImageTexture need to change fragment shader. But DALI default image shader doesn't changed!");
  82     }
  83     else if(DALI_UNLIKELY(mFragmentShaderNeedChange == ImageVisualShaderFeature::ChangeFragmentShader::UNDECIDED))
  84     {
  85       mFragmentShaderNeedChange = (modified) ? ImageVisualShaderFeature::ChangeFragmentShader::NEED_CHANGE : ImageVisualShaderFeature::ChangeFragmentShader::DONT_CHANGE;
  86
  87       if(mFragmentShaderNeedChange == ImageVisualShaderFeature::ChangeFragmentShader::DONT_CHANGE)
  88       {
  89         shaderType = static_cast<VisualFactoryCache::ShaderType>(static_cast<int>(shaderType) - NATIVE_SHADER_TYPE_OFFSET);
  90         shader     = factoryCache.GetShader(shaderType);
  91       }
  92     }
  93   }
  94
  95   if(shader)
  96   {
  97     return shader;
  98   }
  99
 100   shader = Shader::New(vertexShader, fragmentShader);
 101   shader.RegisterProperty(PIXEL_AREA_UNIFORM_NAME, FULL_TEXTURE_RECT);
 102   factoryCache.SaveShader(shaderType, shader);
 103
 104   return shader;
 105 }
 106
 107 std::string_view ImageVisualShaderFactory::GetVertexShaderSource()
 108 {
 109   // static string variable to cache complete vertex shader
 110   static std::string gVertexShader;
 111   if(gVertexShader.empty())
 112   {
 113     gVertexShader = Dali::Shader::GetVertexShaderPrefix() + SHADER_IMAGE_VISUAL_SHADER_VERT.data();
 114   }
 115
 116   return gVertexShader;
 117 }
 118
 119 std::string_view ImageVisualShaderFactory::GetFragmentShaderSource()
 120 {
 121   // static string variable to cache complete fragment shader (no atlas)
 122   static std::string gFragmentShaderNoAtlas;
 123   if(gFragmentShaderNoAtlas.empty())
 124   {
 125     gFragmentShaderNoAtlas = Dali::Shader::GetFragmentShaderPrefix() + SHADER_IMAGE_VISUAL_SHADER_FRAG.data();
 126   }
 127   return gFragmentShaderNoAtlas;
 128 }
 129
 130 } // namespace Internal
 131
 132 } // namespace Toolkit
 133
 134 } // namespace Dali