dali/internal/render/common/render-manager.cpp

   1 /*
   2  * Copyright (c) 2020 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 // CLASS HEADER
  19 #include <dali/internal/render/common/render-manager.h>
  20
  21 // EXTERNAL INCLUDES
  22 #include <memory.h>
  23
  24 // INTERNAL INCLUDES
  25 #include <dali/public-api/actors/sampling.h>
  26 #include <dali/public-api/common/dali-common.h>
  27 #include <dali/public-api/common/stage.h>
  28 #include <dali/public-api/render-tasks/render-task.h>
  29 #include <dali/devel-api/threading/thread-pool.h>
  30 #include <dali/integration-api/debug.h>
  31 #include <dali/integration-api/core.h>
  32 #include <dali/integration-api/gl-context-helper-abstraction.h>
  33 #include <dali/internal/common/owner-pointer.h>
  34 #include <dali/internal/event/common/scene-impl.h>
  35 #include <dali/internal/render/common/render-algorithms.h>
  36 #include <dali/internal/render/common/render-debug.h>
  37 #include <dali/internal/render/common/render-tracker.h>
  38 #include <dali/internal/render/common/render-instruction-container.h>
  39 #include <dali/internal/render/common/render-instruction.h>
  40 #include <dali/internal/render/gl-resources/context.h>
  41 #include <dali/internal/render/queue/render-queue.h>
  42 #include <dali/internal/render/renderers/render-frame-buffer.h>
  43 #include <dali/internal/render/renderers/render-geometry.h>
  44 #include <dali/internal/render/renderers/render-renderer.h>
  45 #include <dali/internal/render/renderers/render-sampler.h>
  46 #include <dali/internal/render/shaders/program-controller.h>
  47 #include <dali/internal/update/common/scene-graph-scene.h>
  48
  49 namespace Dali
  50 {
  51
  52 namespace Internal
  53 {
  54
  55 namespace SceneGraph
  56 {
  57
  58 #if defined(DEBUG_ENABLED)
  59 namespace
  60 {
  61 Debug::Filter* gLogFilter = Debug::Filter::New(Debug::NoLogging, false, "LOG_RENDER_MANAGER" );
  62 } // unnamed namespace
  63 #endif
  64
  65 /**
  66  * Structure to contain internal data
  67  */
  68 struct RenderManager::Impl
  69 {
  70   Impl( Integration::GlAbstraction& glAbstraction,
  71         Integration::GlSyncAbstraction& glSyncAbstraction,
  72         Integration::GlContextHelperAbstraction& glContextHelperAbstraction,
  73         Integration::DepthBufferAvailable depthBufferAvailableParam,
  74         Integration::StencilBufferAvailable stencilBufferAvailableParam )
  75   : context( glAbstraction, &sceneContextContainer ),
  76     currentContext( &context ),
  77     glAbstraction( glAbstraction ),
  78     glSyncAbstraction( glSyncAbstraction ),
  79     glContextHelperAbstraction( glContextHelperAbstraction ),
  80     renderQueue(),
  81     renderAlgorithms(),
  82     frameCount( 0u ),
  83     renderBufferIndex( SceneGraphBuffers::INITIAL_UPDATE_BUFFER_INDEX ),
  84     defaultSurfaceRect(),
  85     rendererContainer(),
  86     samplerContainer(),
  87     textureContainer(),
  88     frameBufferContainer(),
  89     lastFrameWasRendered( false ),
  90     programController( glAbstraction ),
  91     depthBufferAvailable( depthBufferAvailableParam ),
  92     stencilBufferAvailable( stencilBufferAvailableParam )
  93   {
  94      // Create thread pool with just one thread ( there may be a need to create more threads in the future ).
  95     threadPool = std::unique_ptr<Dali::ThreadPool>( new Dali::ThreadPool() );
  96     threadPool->Initialize( 1u );
  97   }
  98
  99   ~Impl()
 100   {
 101     threadPool.reset( nullptr ); // reset now to maintain correct destruction order
 102   }
 103
 104   void AddRenderTracker( Render::RenderTracker* renderTracker )
 105   {
 106     DALI_ASSERT_DEBUG( renderTracker != NULL );
 107     mRenderTrackers.PushBack( renderTracker );
 108   }
 109
 110   void RemoveRenderTracker( Render::RenderTracker* renderTracker )
 111   {
 112     mRenderTrackers.EraseObject( renderTracker );
 113   }
 114
 115   Context* CreateSceneContext()
 116   {
 117     sceneContextContainer.push_back( new Context( glAbstraction ) );
 118     return sceneContextContainer[ sceneContextContainer.size() - 1 ];
 119   }
 120
 121   void DestroySceneContext( Context* sceneContext )
 122   {
 123     auto iter = std::find( sceneContextContainer.begin(), sceneContextContainer.end(), sceneContext );
 124     if( iter != sceneContextContainer.end() )
 125     {
 126       sceneContextContainer.erase( iter );
 127     }
 128   }
 129
 130   Context* ReplaceSceneContext( Context* oldSceneContext )
 131   {
 132     Context* newContext = new Context( glAbstraction );
 133     std::replace( sceneContextContainer.begin(), sceneContextContainer.end(), oldSceneContext, newContext );
 134     return newContext;
 135   }
 136
 137   void UpdateTrackers()
 138   {
 139     for( auto&& iter : mRenderTrackers )
 140     {
 141       iter->PollSyncObject();
 142     }
 143   }
 144
 145   // the order is important for destruction,
 146   // programs are owned by context at the moment.
 147   Context                                   context;                 ///< Holds the GL state of the share resource context
 148   Context*                                  currentContext;          ///< Holds the GL state of the current context for rendering
 149   std::vector< Context* >                   sceneContextContainer;   ///< List of owned contexts holding the GL state per scene
 150   Integration::GlAbstraction&               glAbstraction;           ///< GL abstraction
 151   Integration::GlSyncAbstraction&           glSyncAbstraction;       ///< GL sync abstraction
 152   Integration::GlContextHelperAbstraction&  glContextHelperAbstraction; ///< GL context helper abstraction
 153   RenderQueue                               renderQueue;             ///< A message queue for receiving messages from the update-thread.
 154
 155   std::vector< SceneGraph::Scene* >         sceneContainer;          ///< List of pointers to the scene graph objects of the scenes
 156
 157   Render::RenderAlgorithms                  renderAlgorithms;        ///< The RenderAlgorithms object is used to action the renders required by a RenderInstruction
 158
 159   uint32_t                                  frameCount;              ///< The current frame count
 160   BufferIndex                               renderBufferIndex;       ///< The index of the buffer to read from; this is opposite of the "update" buffer
 161
 162   Rect<int32_t>                             defaultSurfaceRect;      ///< Rectangle for the default surface we are rendering to
 163
 164   OwnerContainer< Render::Renderer* >       rendererContainer;       ///< List of owned renderers
 165   OwnerContainer< Render::Sampler* >        samplerContainer;        ///< List of owned samplers
 166   OwnerContainer< Render::Texture* >        textureContainer;        ///< List of owned textures
 167   OwnerContainer< Render::FrameBuffer* >    frameBufferContainer;    ///< List of owned framebuffers
 168   OwnerContainer< Render::PropertyBuffer* > propertyBufferContainer; ///< List of owned property buffers
 169   OwnerContainer< Render::Geometry* >       geometryContainer;       ///< List of owned Geometries
 170
 171   bool                                      lastFrameWasRendered;    ///< Keeps track of the last frame being rendered due to having render instructions
 172
 173   OwnerContainer< Render::RenderTracker* >  mRenderTrackers;         ///< List of render trackers
 174
 175   ProgramController                         programController;        ///< Owner of the GL programs
 176
 177   Integration::DepthBufferAvailable         depthBufferAvailable;     ///< Whether the depth buffer is available
 178   Integration::StencilBufferAvailable       stencilBufferAvailable;   ///< Whether the stencil buffer is available
 179
 180   std::unique_ptr<Dali::ThreadPool>         threadPool;               ///< The thread pool
 181   Vector<GLuint>                            boundTextures;            ///< The textures bound for rendering
 182   Vector<GLuint>                            textureDependencyList;    ///< The dependency list of binded textures
 183 };
 184
 185 RenderManager* RenderManager::New( Integration::GlAbstraction& glAbstraction,
 186                                    Integration::GlSyncAbstraction& glSyncAbstraction,
 187                                    Integration::GlContextHelperAbstraction& glContextHelperAbstraction,
 188                                    Integration::DepthBufferAvailable depthBufferAvailable,
 189                                    Integration::StencilBufferAvailable stencilBufferAvailable )
 190 {
 191   RenderManager* manager = new RenderManager;
 192   manager->mImpl = new Impl( glAbstraction,
 193                              glSyncAbstraction,
 194                              glContextHelperAbstraction,
 195                              depthBufferAvailable,
 196                              stencilBufferAvailable );
 197   return manager;
 198 }
 199
 200 RenderManager::RenderManager()
 201 : mImpl(NULL)
 202 {
 203 }
 204
 205 RenderManager::~RenderManager()
 206 {
 207   delete mImpl;
 208 }
 209
 210 RenderQueue& RenderManager::GetRenderQueue()
 211 {
 212   return mImpl->renderQueue;
 213 }
 214
 215 void RenderManager::ContextCreated()
 216 {
 217   mImpl->context.GlContextCreated();
 218   mImpl->programController.GlContextCreated();
 219
 220   // renderers, textures and gpu buffers cannot reinitialize themselves
 221   // so they rely on someone reloading the data for them
 222 }
 223
 224 void RenderManager::ContextDestroyed()
 225 {
 226   mImpl->context.GlContextDestroyed();
 227   mImpl->programController.GlContextDestroyed();
 228
 229   //Inform textures
 230   for( auto&& texture : mImpl->textureContainer )
 231   {
 232     texture->GlContextDestroyed();
 233   }
 234
 235   //Inform framebuffers
 236   for( auto&& framebuffer : mImpl->frameBufferContainer )
 237   {
 238     framebuffer->GlContextDestroyed();
 239   }
 240
 241   // inform renderers
 242   for( auto&& renderer : mImpl->rendererContainer )
 243   {
 244     renderer->GlContextDestroyed();
 245   }
 246
 247   // inform scenes
 248   for( auto&& scene : mImpl->sceneContainer )
 249   {
 250     scene->GlContextDestroyed();
 251   }
 252 }
 253
 254 void RenderManager::SetShaderSaver( ShaderSaver& upstream )
 255 {
 256   mImpl->programController.SetShaderSaver( upstream );
 257 }
 258
 259 void RenderManager::SetDefaultSurfaceRect(const Rect<int32_t>& rect)
 260 {
 261   mImpl->defaultSurfaceRect = rect;
 262 }
 263
 264 void RenderManager::AddRenderer( OwnerPointer< Render::Renderer >& renderer )
 265 {
 266   // Initialize the renderer as we are now in render thread
 267   renderer->Initialize( mImpl->context );
 268
 269   mImpl->rendererContainer.PushBack( renderer.Release() );
 270 }
 271
 272 void RenderManager::RemoveRenderer( Render::Renderer* renderer )
 273 {
 274   mImpl->rendererContainer.EraseObject( renderer );
 275 }
 276
 277 void RenderManager::AddSampler( OwnerPointer< Render::Sampler >& sampler )
 278 {
 279   mImpl->samplerContainer.PushBack( sampler.Release() );
 280 }
 281
 282 void RenderManager::RemoveSampler( Render::Sampler* sampler )
 283 {
 284   mImpl->samplerContainer.EraseObject( sampler );
 285 }
 286
 287 void RenderManager::AddTexture( OwnerPointer< Render::Texture >& texture )
 288 {
 289   texture->Initialize( mImpl->context );
 290   mImpl->textureContainer.PushBack( texture.Release() );
 291 }
 292
 293 void RenderManager::RemoveTexture( Render::Texture* texture )
 294 {
 295   DALI_ASSERT_DEBUG( NULL != texture );
 296
 297   // Find the texture, use reference to pointer so we can do the erase safely
 298   for ( auto&& iter : mImpl->textureContainer )
 299   {
 300     if ( iter == texture )
 301     {
 302       texture->Destroy( mImpl->context );
 303       mImpl->textureContainer.Erase( &iter ); // Texture found; now destroy it
 304       return;
 305     }
 306   }
 307 }
 308
 309 void RenderManager::UploadTexture( Render::Texture* texture, PixelDataPtr pixelData, const Texture::UploadParams& params )
 310 {
 311   texture->Upload( mImpl->context, pixelData, params );
 312 }
 313
 314 void RenderManager::GenerateMipmaps( Render::Texture* texture )
 315 {
 316   texture->GenerateMipmaps( mImpl->context );
 317 }
 318
 319 void RenderManager::SetFilterMode( Render::Sampler* sampler, uint32_t minFilterMode, uint32_t magFilterMode )
 320 {
 321   sampler->mMinificationFilter = static_cast<Dali::FilterMode::Type>(minFilterMode);
 322   sampler->mMagnificationFilter = static_cast<Dali::FilterMode::Type>(magFilterMode );
 323 }
 324
 325 void RenderManager::SetWrapMode( Render::Sampler* sampler, uint32_t rWrapMode, uint32_t sWrapMode, uint32_t tWrapMode )
 326 {
 327   sampler->mRWrapMode = static_cast<Dali::WrapMode::Type>(rWrapMode);
 328   sampler->mSWrapMode = static_cast<Dali::WrapMode::Type>(sWrapMode);
 329   sampler->mTWrapMode = static_cast<Dali::WrapMode::Type>(tWrapMode);
 330 }
 331
 332 void RenderManager::AddFrameBuffer( OwnerPointer< Render::FrameBuffer >& frameBuffer )
 333 {
 334   Render::FrameBuffer* frameBufferPtr = frameBuffer.Release();
 335   mImpl->frameBufferContainer.PushBack( frameBufferPtr );
 336   frameBufferPtr->Initialize( mImpl->context );
 337 }
 338
 339 void RenderManager::RemoveFrameBuffer( Render::FrameBuffer* frameBuffer )
 340 {
 341   DALI_ASSERT_DEBUG( NULL != frameBuffer );
 342
 343   // Find the sampler, use reference so we can safely do the erase
 344   for ( auto&& iter : mImpl->frameBufferContainer )
 345   {
 346     if ( iter == frameBuffer )
 347     {
 348       frameBuffer->Destroy( mImpl->context );
 349       mImpl->frameBufferContainer.Erase( &iter ); // frameBuffer found; now destroy it
 350
 351       break;
 352     }
 353   }
 354 }
 355 void RenderManager::InitializeScene( SceneGraph::Scene* scene )
 356 {
 357   scene->Initialize( *mImpl->CreateSceneContext() );
 358   mImpl->sceneContainer.push_back( scene );
 359 }
 360
 361 void RenderManager::UninitializeScene( SceneGraph::Scene* scene )
 362 {
 363   mImpl->DestroySceneContext( scene->GetContext() );
 364
 365   auto iter = std::find( mImpl->sceneContainer.begin(), mImpl->sceneContainer.end(), scene );
 366   if( iter != mImpl->sceneContainer.end() )
 367   {
 368     mImpl->sceneContainer.erase( iter );
 369   }
 370 }
 371
 372 void RenderManager::SurfaceReplaced( SceneGraph::Scene* scene )
 373 {
 374   Context* newContext = mImpl->ReplaceSceneContext( scene->GetContext() );
 375   scene->Initialize( *newContext );
 376 }
 377
 378 void RenderManager::AttachColorTextureToFrameBuffer( Render::FrameBuffer* frameBuffer, Render::Texture* texture, uint32_t mipmapLevel, uint32_t layer )
 379 {
 380   frameBuffer->AttachColorTexture( mImpl->context, texture, mipmapLevel, layer );
 381 }
 382
 383 void RenderManager::AddPropertyBuffer( OwnerPointer< Render::PropertyBuffer >& propertyBuffer )
 384 {
 385   mImpl->propertyBufferContainer.PushBack( propertyBuffer.Release() );
 386 }
 387
 388 void RenderManager::RemovePropertyBuffer( Render::PropertyBuffer* propertyBuffer )
 389 {
 390   mImpl->propertyBufferContainer.EraseObject( propertyBuffer );
 391 }
 392
 393 void RenderManager::SetPropertyBufferFormat( Render::PropertyBuffer* propertyBuffer, OwnerPointer< Render::PropertyBuffer::Format>& format )
 394 {
 395   propertyBuffer->SetFormat( format.Release() );
 396 }
 397
 398 void RenderManager::SetPropertyBufferData( Render::PropertyBuffer* propertyBuffer, OwnerPointer< Vector<uint8_t> >& data, uint32_t size )
 399 {
 400   propertyBuffer->SetData( data.Release(), size );
 401 }
 402
 403 void RenderManager::SetIndexBuffer( Render::Geometry* geometry, Dali::Vector<uint16_t>& indices )
 404 {
 405   geometry->SetIndexBuffer( indices );
 406 }
 407
 408 void RenderManager::AddGeometry( OwnerPointer< Render::Geometry >& geometry )
 409 {
 410   mImpl->geometryContainer.PushBack( geometry.Release() );
 411 }
 412
 413 void RenderManager::RemoveGeometry( Render::Geometry* geometry )
 414 {
 415   mImpl->geometryContainer.EraseObject( geometry );
 416 }
 417
 418 void RenderManager::AttachVertexBuffer( Render::Geometry* geometry, Render::PropertyBuffer* propertyBuffer )
 419 {
 420   DALI_ASSERT_DEBUG( NULL != geometry );
 421
 422   // Find the geometry
 423   for ( auto&& iter : mImpl->geometryContainer )
 424   {
 425     if ( iter == geometry )
 426     {
 427       iter->AddPropertyBuffer( propertyBuffer );
 428       break;
 429     }
 430   }
 431 }
 432
 433 void RenderManager::RemoveVertexBuffer( Render::Geometry* geometry, Render::PropertyBuffer* propertyBuffer )
 434 {
 435   DALI_ASSERT_DEBUG( NULL != geometry );
 436
 437   // Find the geometry
 438   for ( auto&& iter : mImpl->geometryContainer )
 439   {
 440     if ( iter == geometry )
 441     {
 442       iter->RemovePropertyBuffer( propertyBuffer );
 443       break;
 444     }
 445   }
 446 }
 447
 448 void RenderManager::SetGeometryType( Render::Geometry* geometry, uint32_t geometryType )
 449 {
 450   geometry->SetType( Render::Geometry::Type(geometryType) );
 451 }
 452
 453 void RenderManager::AddRenderTracker( Render::RenderTracker* renderTracker )
 454 {
 455   mImpl->AddRenderTracker(renderTracker);
 456 }
 457
 458 void RenderManager::RemoveRenderTracker( Render::RenderTracker* renderTracker )
 459 {
 460   mImpl->RemoveRenderTracker(renderTracker);
 461 }
 462
 463 ProgramCache* RenderManager::GetProgramCache()
 464 {
 465   return &(mImpl->programController);
 466 }
 467
 468 void RenderManager::PreRender( Integration::RenderStatus& status, bool forceClear, bool uploadOnly )
 469 {
 470   DALI_PRINT_RENDER_START( mImpl->renderBufferIndex );
 471
 472   // Core::Render documents that GL context must be current before calling Render
 473   DALI_ASSERT_DEBUG( mImpl->context.IsGlContextCreated() );
 474
 475   // Increment the frame count at the beginning of each frame
 476   ++mImpl->frameCount;
 477
 478   // Process messages queued during previous update
 479   mImpl->renderQueue.ProcessMessages( mImpl->renderBufferIndex );
 480
 481   uint32_t count = 0u;
 482   for( uint32_t i = 0; i < mImpl->sceneContainer.size(); ++i )
 483   {
 484     count += mImpl->sceneContainer[i]->GetRenderInstructions().Count( mImpl->renderBufferIndex );
 485   }
 486
 487   const bool haveInstructions = count > 0u;
 488
 489   DALI_LOG_INFO( gLogFilter, Debug::General,
 490                  "Render: haveInstructions(%s) || mImpl->lastFrameWasRendered(%s) || forceClear(%s)\n",
 491                  haveInstructions ? "true" : "false",
 492                  mImpl->lastFrameWasRendered ? "true" : "false",
 493                  forceClear ? "true" : "false" );
 494
 495   // Only render if we have instructions to render, or the last frame was rendered (and therefore a clear is required).
 496   if( haveInstructions || mImpl->lastFrameWasRendered || forceClear )
 497   {
 498     DALI_LOG_INFO( gLogFilter, Debug::General, "Render: Processing\n" );
 499
 500     if ( !uploadOnly )
 501     {
 502       // Mark that we will require a post-render step to be performed (includes swap-buffers).
 503       status.SetNeedsPostRender( true );
 504     }
 505
 506     // Switch to the shared context
 507     if ( mImpl->currentContext != &mImpl->context )
 508     {
 509       mImpl->currentContext = &mImpl->context;
 510
 511       if ( mImpl->currentContext->IsSurfacelessContextSupported() )
 512       {
 513         mImpl->glContextHelperAbstraction.MakeSurfacelessContextCurrent();
 514       }
 515
 516       // Clear the current cached program when the context is switched
 517       mImpl->programController.ClearCurrentProgram();
 518     }
 519
 520     // Upload the geometries
 521     for( uint32_t i = 0; i < mImpl->sceneContainer.size(); ++i )
 522     {
 523       RenderInstructionContainer& instructions = mImpl->sceneContainer[i]->GetRenderInstructions();
 524       for ( uint32_t j = 0; j < instructions.Count( mImpl->renderBufferIndex ); ++j )
 525       {
 526         RenderInstruction& instruction = instructions.At( mImpl->renderBufferIndex, j );
 527
 528         const Matrix* viewMatrix       = instruction.GetViewMatrix( mImpl->renderBufferIndex );
 529         const Matrix* projectionMatrix = instruction.GetProjectionMatrix( mImpl->renderBufferIndex );
 530
 531         DALI_ASSERT_DEBUG( viewMatrix );
 532         DALI_ASSERT_DEBUG( projectionMatrix );
 533
 534         if( viewMatrix && projectionMatrix )
 535         {
 536           const RenderListContainer::SizeType renderListCount = instruction.RenderListCount();
 537
 538           // Iterate through each render list.
 539           for( RenderListContainer::SizeType index = 0; index < renderListCount; ++index )
 540           {
 541             const RenderList* renderList = instruction.GetRenderList( index );
 542
 543             if( renderList && !renderList->IsEmpty() )
 544             {
 545               const std::size_t itemCount = renderList->Count();
 546               for( uint32_t itemIndex = 0u; itemIndex < itemCount; ++itemIndex )
 547               {
 548                 const RenderItem& item = renderList->GetItem( itemIndex );
 549                 if( DALI_LIKELY( item.mRenderer ) )
 550                 {
 551                   item.mRenderer->Upload( *mImpl->currentContext );
 552                 }
 553               }
 554             }
 555           }
 556         }
 557       }
 558     }
 559   }
 560 }
 561
 562
 563 void RenderManager::RenderScene( Integration::Scene& scene, bool renderToFbo )
 564 {
 565   Internal::Scene& sceneInternal = GetImplementation( scene );
 566   SceneGraph::Scene* sceneObject = sceneInternal.GetSceneObject();
 567
 568   uint32_t count = sceneObject->GetRenderInstructions().Count( mImpl->renderBufferIndex );
 569
 570   for( uint32_t i = 0; i < count; ++i )
 571   {
 572     RenderInstruction& instruction = sceneObject->GetRenderInstructions().At( mImpl->renderBufferIndex, i );
 573
 574     if ( ( renderToFbo && !instruction.mFrameBuffer ) || ( !renderToFbo && instruction.mFrameBuffer ) )
 575     {
 576       continue; // skip
 577     }
 578
 579     Rect<int32_t> viewportRect;
 580     Vector4   clearColor;
 581
 582     if ( instruction.mIsClearColorSet )
 583     {
 584       clearColor = instruction.mClearColor;
 585     }
 586     else
 587     {
 588       clearColor = Dali::RenderTask::DEFAULT_CLEAR_COLOR;
 589     }
 590
 591     Rect<int32_t> surfaceRect = mImpl->defaultSurfaceRect;
 592     Integration::DepthBufferAvailable depthBufferAvailable = mImpl->depthBufferAvailable;
 593     Integration::StencilBufferAvailable stencilBufferAvailable = mImpl->stencilBufferAvailable;
 594
 595     if ( instruction.mFrameBuffer )
 596     {
 597       // offscreen buffer
 598       if ( mImpl->currentContext != &mImpl->context )
 599       {
 600         // Switch to shared context for off-screen buffer
 601         mImpl->currentContext = &mImpl->context;
 602
 603         if ( mImpl->currentContext->IsSurfacelessContextSupported() )
 604         {
 605           mImpl->glContextHelperAbstraction.MakeSurfacelessContextCurrent();
 606         }
 607
 608         // Clear the current cached program when the context is switched
 609         mImpl->programController.ClearCurrentProgram();
 610       }
 611     }
 612     else
 613     {
 614       if ( mImpl->currentContext->IsSurfacelessContextSupported() )
 615       {
 616         if ( mImpl->currentContext != sceneObject->GetContext() )
 617         {
 618           // Switch the correct context if rendering to a surface
 619           mImpl->currentContext = sceneObject->GetContext();
 620
 621           // Clear the current cached program when the context is switched
 622           mImpl->programController.ClearCurrentProgram();
 623         }
 624       }
 625
 626       surfaceRect = Rect<int32_t>( 0, 0, static_cast<int32_t>( scene.GetSize().width ), static_cast<int32_t>( scene.GetSize().height ) );
 627     }
 628
 629     DALI_ASSERT_DEBUG( mImpl->currentContext->IsGlContextCreated() );
 630
 631     // reset the program matrices for all programs once per frame
 632     // this ensures we will set view and projection matrix once per program per camera
 633     mImpl->programController.ResetProgramMatrices();
 634
 635     if( instruction.mFrameBuffer )
 636     {
 637       instruction.mFrameBuffer->Bind( *mImpl->currentContext );
 638
 639       // For each offscreen buffer, update the dependency list with the new texture id used by this frame buffer.
 640       for (unsigned int i0 = 0, i1 = instruction.mFrameBuffer->GetColorAttachmentCount(); i0 < i1; ++i0)
 641       {
 642         mImpl->textureDependencyList.PushBack( instruction.mFrameBuffer->GetTextureId(i0) );
 643       }
 644     }
 645     else
 646     {
 647       mImpl->currentContext->BindFramebuffer( GL_FRAMEBUFFER, 0u );
 648     }
 649
 650     if ( !instruction.mFrameBuffer )
 651     {
 652       mImpl->currentContext->Viewport( surfaceRect.x,
 653                                        surfaceRect.y,
 654                                        surfaceRect.width,
 655                                        surfaceRect.height );
 656     }
 657
 658     // Clear the entire color, depth and stencil buffers for the default framebuffer, if required.
 659     // It is important to clear all 3 buffers when they are being used, for performance on deferred renderers
 660     // e.g. previously when the depth & stencil buffers were NOT cleared, it caused the DDK to exceed a "vertex count limit",
 661     // and then stall. That problem is only noticeable when rendering a large number of vertices per frame.
 662     GLbitfield clearMask = GL_COLOR_BUFFER_BIT;
 663
 664     mImpl->currentContext->ColorMask( true );
 665
 666     if( depthBufferAvailable == Integration::DepthBufferAvailable::TRUE )
 667     {
 668       mImpl->currentContext->DepthMask( true );
 669       clearMask |= GL_DEPTH_BUFFER_BIT;
 670     }
 671
 672     if( stencilBufferAvailable == Integration::StencilBufferAvailable::TRUE)
 673     {
 674       mImpl->currentContext->ClearStencil( 0 );
 675       mImpl->currentContext->StencilMask( 0xFF ); // 8 bit stencil mask, all 1's
 676       clearMask |= GL_STENCIL_BUFFER_BIT;
 677     }
 678
 679     if( !instruction.mIgnoreRenderToFbo && ( instruction.mFrameBuffer != 0 ) )
 680     {
 681       // Offscreen buffer rendering
 682       if ( instruction.mIsViewportSet )
 683       {
 684         // For glViewport the lower-left corner is (0,0)
 685         const int32_t y = ( instruction.mFrameBuffer->GetHeight() - instruction.mViewport.height ) - instruction.mViewport.y;
 686         viewportRect.Set( instruction.mViewport.x,  y, instruction.mViewport.width, instruction.mViewport.height );
 687       }
 688       else
 689       {
 690         viewportRect.Set( 0, 0, instruction.mFrameBuffer->GetWidth(), instruction.mFrameBuffer->GetHeight() );
 691       }
 692     }
 693     else // No Offscreen frame buffer rendering
 694     {
 695       // Check whether a viewport is specified, otherwise the full surface size is used
 696       if ( instruction.mIsViewportSet )
 697       {
 698         // For glViewport the lower-left corner is (0,0)
 699         const int32_t y = ( surfaceRect.height - instruction.mViewport.height ) - instruction.mViewport.y;
 700         viewportRect.Set( instruction.mViewport.x,  y, instruction.mViewport.width, instruction.mViewport.height );
 701       }
 702       else
 703       {
 704         viewportRect = surfaceRect;
 705       }
 706     }
 707
 708     bool clearFullFrameRect = true;
 709     if( instruction.mFrameBuffer != 0 )
 710     {
 711       Viewport frameRect( 0, 0, instruction.mFrameBuffer->GetWidth(), instruction.mFrameBuffer->GetHeight() );
 712       clearFullFrameRect = ( frameRect == viewportRect );
 713     }
 714     else
 715     {
 716       clearFullFrameRect = ( surfaceRect == viewportRect );
 717     }
 718
 719     mImpl->currentContext->Viewport(viewportRect.x, viewportRect.y, viewportRect.width, viewportRect.height);
 720
 721     if( instruction.mIsClearColorSet )
 722     {
 723       mImpl->currentContext->ClearColor( clearColor.r,
 724                                          clearColor.g,
 725                                          clearColor.b,
 726                                          clearColor.a );
 727
 728       if( !clearFullFrameRect )
 729       {
 730         mImpl->currentContext->SetScissorTest( true );
 731         mImpl->currentContext->Scissor( viewportRect.x, viewportRect.y, viewportRect.width, viewportRect.height );
 732         mImpl->currentContext->Clear( clearMask, Context::FORCE_CLEAR );
 733         mImpl->currentContext->SetScissorTest( false );
 734       }
 735       else
 736       {
 737         mImpl->currentContext->SetScissorTest( false );
 738         mImpl->currentContext->Clear( clearMask, Context::FORCE_CLEAR );
 739       }
 740     }
 741
 742     // Clear the list of bound textures
 743     mImpl->boundTextures.Clear();
 744
 745     mImpl->renderAlgorithms.ProcessRenderInstruction(
 746         instruction,
 747         *mImpl->currentContext,
 748         mImpl->renderBufferIndex,
 749         depthBufferAvailable,
 750         stencilBufferAvailable,
 751         mImpl->boundTextures );
 752
 753     // Synchronise the FBO/Texture access when there are multiple contexts
 754     if ( mImpl->currentContext->IsSurfacelessContextSupported() )
 755     {
 756       // Check whether any binded texture is in the dependency list
 757       bool textureFound = false;
 758
 759       if ( mImpl->boundTextures.Count() > 0u && mImpl->textureDependencyList.Count() > 0u )
 760       {
 761         for ( auto textureId : mImpl->textureDependencyList )
 762         {
 763
 764           textureFound = std::find_if( mImpl->boundTextures.Begin(), mImpl->boundTextures.End(),
 765                                        [textureId]( GLuint id )
 766                                        {
 767                                          return textureId == id;
 768                                        } ) != mImpl->boundTextures.End();
 769         }
 770       }
 771
 772       if ( textureFound )
 773       {
 774         if ( instruction.mFrameBuffer )
 775         {
 776           // For off-screen buffer
 777
 778           // Wait until all rendering calls for the currently context are executed
 779           mImpl->glContextHelperAbstraction.WaitClient();
 780
 781           // Clear the dependency list
 782           mImpl->textureDependencyList.Clear();
 783         }
 784         else
 785         {
 786           // Worker thread lambda function
 787           auto& glContextHelperAbstraction = mImpl->glContextHelperAbstraction;
 788           auto workerFunction = [&glContextHelperAbstraction]( int workerThread )
 789           {
 790             // Switch to the shared context in the worker thread
 791             glContextHelperAbstraction.MakeSurfacelessContextCurrent();
 792
 793             // Wait until all rendering calls for the shared context are executed
 794             glContextHelperAbstraction.WaitClient();
 795
 796             // Must clear the context in the worker thread
 797             // Otherwise the shared context cannot be switched to from the render thread
 798             glContextHelperAbstraction.MakeContextNull();
 799           };
 800
 801           auto future = mImpl->threadPool->SubmitTask( 0u, workerFunction );
 802           if ( future )
 803           {
 804             mImpl->threadPool->Wait();
 805
 806             // Clear the dependency list
 807             mImpl->textureDependencyList.Clear();
 808           }
 809         }
 810       }
 811     }
 812
 813     if( instruction.mRenderTracker && instruction.mFrameBuffer )
 814     {
 815       // This will create a sync object every frame this render tracker
 816       // is alive (though it should be now be created only for
 817       // render-once render tasks)
 818       instruction.mRenderTracker->CreateSyncObject( mImpl->glSyncAbstraction );
 819       instruction.mRenderTracker = nullptr; // Only create once.
 820     }
 821
 822     if ( renderToFbo )
 823     {
 824       mImpl->currentContext->Flush();
 825     }
 826   }
 827
 828   GLenum attachments[] = { GL_DEPTH, GL_STENCIL };
 829   mImpl->currentContext->InvalidateFramebuffer(GL_FRAMEBUFFER, 2, attachments);
 830 }
 831
 832 void RenderManager::PostRender( bool uploadOnly )
 833 {
 834   if ( !uploadOnly )
 835   {
 836     if ( mImpl->currentContext->IsSurfacelessContextSupported() )
 837     {
 838       mImpl->glContextHelperAbstraction.MakeSurfacelessContextCurrent();
 839     }
 840
 841     GLenum attachments[] = { GL_DEPTH, GL_STENCIL };
 842     mImpl->context.InvalidateFramebuffer(GL_FRAMEBUFFER, 2, attachments);
 843   }
 844
 845   //Notify RenderGeometries that rendering has finished
 846   for ( auto&& iter : mImpl->geometryContainer )
 847   {
 848     iter->OnRenderFinished();
 849   }
 850
 851   mImpl->UpdateTrackers();
 852
 853
 854   uint32_t count = 0u;
 855   for( uint32_t i = 0; i < mImpl->sceneContainer.size(); ++i )
 856   {
 857     count += mImpl->sceneContainer[i]->GetRenderInstructions().Count( mImpl->renderBufferIndex );
 858   }
 859
 860   const bool haveInstructions = count > 0u;
 861
 862   // If this frame was rendered due to instructions existing, we mark this so we know to clear the next frame.
 863   mImpl->lastFrameWasRendered = haveInstructions;
 864
 865   /**
 866    * The rendering has finished; swap to the next buffer.
 867    * Ideally the update has just finished using this buffer; otherwise the render thread
 868    * should block until the update has finished.
 869    */
 870   mImpl->renderBufferIndex = (0 != mImpl->renderBufferIndex) ? 0 : 1;
 871
 872   DALI_PRINT_RENDER_END();
 873 }
 874
 875 } // namespace SceneGraph
 876
 877 } // namespace Internal
 878
 879 } // namespace Dali