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

   1 /*
   2  * Copyright (c) 2019 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/render/common/render-algorithms.h>
  35 #include <dali/internal/render/common/render-debug.h>
  36 #include <dali/internal/render/common/render-tracker.h>
  37 #include <dali/internal/render/common/render-instruction-container.h>
  38 #include <dali/internal/render/common/render-instruction.h>
  39 #include <dali/internal/render/gl-resources/context.h>
  40 #include <dali/internal/render/queue/render-queue.h>
  41 #include <dali/internal/render/renderers/render-frame-buffer.h>
  42 #include <dali/internal/render/renderers/render-texture-frame-buffer.h>
  43 #include <dali/internal/render/renderers/render-surface-frame-buffer.h>
  44 #include <dali/internal/render/renderers/render-geometry.h>
  45 #include <dali/internal/render/renderers/render-renderer.h>
  46 #include <dali/internal/render/renderers/render-sampler.h>
  47 #include <dali/internal/render/shaders/program-controller.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, &surfaceContextContainer ),
  76     currentContext( &context ),
  77     glAbstraction( glAbstraction ),
  78     glSyncAbstraction( glSyncAbstraction ),
  79     glContextHelperAbstraction( glContextHelperAbstraction ),
  80     renderQueue(),
  81     instructions(),
  82     renderAlgorithms(),
  83     backgroundColor( Dali::Stage::DEFAULT_BACKGROUND_COLOR ),
  84     frameCount( 0u ),
  85     renderBufferIndex( SceneGraphBuffers::INITIAL_UPDATE_BUFFER_INDEX ),
  86     defaultSurfaceRect(),
  87     rendererContainer(),
  88     samplerContainer(),
  89     textureContainer(),
  90     frameBufferContainer(),
  91     lastFrameWasRendered( false ),
  92     programController( glAbstraction ),
  93     depthBufferAvailable( depthBufferAvailableParam ),
  94     stencilBufferAvailable( stencilBufferAvailableParam )
  95   {
  96      // Create thread pool with just one thread ( there may be a need to create more threads in the future ).
  97     threadPool = std::unique_ptr<Dali::ThreadPool>( new Dali::ThreadPool() );
  98     threadPool->Initialize( 1u );
  99   }
 100
 101   ~Impl()
 102   {
 103     threadPool.reset( nullptr ); // reset now to maintain correct destruction order
 104   }
 105
 106   void AddRenderTracker( Render::RenderTracker* renderTracker )
 107   {
 108     DALI_ASSERT_DEBUG( renderTracker != NULL );
 109     mRenderTrackers.PushBack( renderTracker );
 110   }
 111
 112   void RemoveRenderTracker( Render::RenderTracker* renderTracker )
 113   {
 114     mRenderTrackers.EraseObject( renderTracker );
 115   }
 116
 117   Context* CreateSurfaceContext()
 118   {
 119     surfaceContextContainer.PushBack( new Context( glAbstraction ) );
 120     return surfaceContextContainer[ surfaceContextContainer.Count() - 1 ];
 121   }
 122
 123   void DestroySurfaceContext( Context* surfaceContext )
 124   {
 125     surfaceContextContainer.EraseObject( surfaceContext );
 126   }
 127
 128   void UpdateTrackers()
 129   {
 130     for( auto&& iter : mRenderTrackers )
 131     {
 132       iter->PollSyncObject();
 133     }
 134   }
 135
 136   // the order is important for destruction,
 137   // programs are owned by context at the moment.
 138   Context                                   context;                 ///< Holds the GL state of the share resource context
 139   Context*                                  currentContext;          ///< Holds the GL state of the current context for rendering
 140   OwnerContainer< Context* >                surfaceContextContainer; ///< List of owned contexts holding the GL state per surface
 141   Integration::GlAbstraction&               glAbstraction;           ///< GL abstraction
 142   Integration::GlSyncAbstraction&           glSyncAbstraction;       ///< GL sync abstraction
 143   Integration::GlContextHelperAbstraction&  glContextHelperAbstraction; ///< GL context helper abstraction
 144   RenderQueue                               renderQueue;             ///< A message queue for receiving messages from the update-thread.
 145
 146   // Render instructions describe what should be rendered during RenderManager::Render()
 147   // Owned by RenderManager. Update manager updates instructions for the next frame while we render the current one
 148   RenderInstructionContainer                instructions;
 149   Render::RenderAlgorithms                  renderAlgorithms;        ///< The RenderAlgorithms object is used to action the renders required by a RenderInstruction
 150
 151   Vector4                                   backgroundColor;         ///< The glClear color used at the beginning of each frame.
 152
 153   uint32_t                                  frameCount;              ///< The current frame count
 154   BufferIndex                               renderBufferIndex;       ///< The index of the buffer to read from; this is opposite of the "update" buffer
 155
 156   Rect<int32_t>                             defaultSurfaceRect;      ///< Rectangle for the default surface we are rendering to
 157
 158   OwnerContainer< Render::Renderer* >       rendererContainer;       ///< List of owned renderers
 159   OwnerContainer< Render::Sampler* >        samplerContainer;        ///< List of owned samplers
 160   OwnerContainer< Render::Texture* >        textureContainer;        ///< List of owned textures
 161   OwnerContainer< Render::FrameBuffer* >    frameBufferContainer;    ///< List of owned framebuffers
 162   OwnerContainer< Render::PropertyBuffer* > propertyBufferContainer; ///< List of owned property buffers
 163   OwnerContainer< Render::Geometry* >       geometryContainer;       ///< List of owned Geometries
 164
 165   bool                                      lastFrameWasRendered;    ///< Keeps track of the last frame being rendered due to having render instructions
 166
 167   OwnerContainer< Render::RenderTracker* >  mRenderTrackers;         ///< List of render trackers
 168
 169   ProgramController                         programController;        ///< Owner of the GL programs
 170
 171   Integration::DepthBufferAvailable         depthBufferAvailable;     ///< Whether the depth buffer is available
 172   Integration::StencilBufferAvailable       stencilBufferAvailable;   ///< Whether the stencil buffer is available
 173
 174   std::unique_ptr<Dali::ThreadPool>         threadPool;               ///< The thread pool
 175   Vector<GLuint>                            boundTextures;            ///< The textures bound for rendering
 176   Vector<GLuint>                            textureDependencyList;    ///< The dependency list of binded textures
 177 };
 178
 179 RenderManager* RenderManager::New( Integration::GlAbstraction& glAbstraction,
 180                                    Integration::GlSyncAbstraction& glSyncAbstraction,
 181                                    Integration::GlContextHelperAbstraction& glContextHelperAbstraction,
 182                                    Integration::DepthBufferAvailable depthBufferAvailable,
 183                                    Integration::StencilBufferAvailable stencilBufferAvailable )
 184 {
 185   RenderManager* manager = new RenderManager;
 186   manager->mImpl = new Impl( glAbstraction,
 187                              glSyncAbstraction,
 188                              glContextHelperAbstraction,
 189                              depthBufferAvailable,
 190                              stencilBufferAvailable );
 191   return manager;
 192 }
 193
 194 RenderManager::RenderManager()
 195 : mImpl(NULL)
 196 {
 197 }
 198
 199 RenderManager::~RenderManager()
 200 {
 201   delete mImpl;
 202 }
 203
 204 RenderQueue& RenderManager::GetRenderQueue()
 205 {
 206   return mImpl->renderQueue;
 207 }
 208
 209 void RenderManager::ContextCreated()
 210 {
 211   mImpl->context.GlContextCreated();
 212   mImpl->programController.GlContextCreated();
 213
 214   // renderers, textures and gpu buffers cannot reinitialize themselves
 215   // so they rely on someone reloading the data for them
 216 }
 217
 218 void RenderManager::ContextDestroyed()
 219 {
 220   mImpl->context.GlContextDestroyed();
 221   mImpl->programController.GlContextDestroyed();
 222
 223   //Inform textures
 224   for( auto&& texture : mImpl->textureContainer )
 225   {
 226     texture->GlContextDestroyed();
 227   }
 228
 229   //Inform framebuffers
 230   for( auto&& framebuffer : mImpl->frameBufferContainer )
 231   {
 232     framebuffer->GlContextDestroyed();
 233   }
 234
 235   // inform renderers
 236   for( auto&& renderer : mImpl->rendererContainer )
 237   {
 238     renderer->GlContextDestroyed();
 239   }
 240 }
 241
 242 void RenderManager::SetShaderSaver( ShaderSaver& upstream )
 243 {
 244   mImpl->programController.SetShaderSaver( upstream );
 245 }
 246
 247 RenderInstructionContainer& RenderManager::GetRenderInstructionContainer()
 248 {
 249   return mImpl->instructions;
 250 }
 251
 252 void RenderManager::SetBackgroundColor( const Vector4& color )
 253 {
 254   mImpl->backgroundColor = color;
 255 }
 256
 257 void RenderManager::SetDefaultSurfaceRect(const Rect<int32_t>& rect)
 258 {
 259   mImpl->defaultSurfaceRect = rect;
 260 }
 261
 262 void RenderManager::AddRenderer( OwnerPointer< Render::Renderer >& renderer )
 263 {
 264   // Initialize the renderer as we are now in render thread
 265   renderer->Initialize( mImpl->context );
 266
 267   mImpl->rendererContainer.PushBack( renderer.Release() );
 268 }
 269
 270 void RenderManager::RemoveRenderer( Render::Renderer* renderer )
 271 {
 272   mImpl->rendererContainer.EraseObject( renderer );
 273 }
 274
 275 void RenderManager::AddSampler( OwnerPointer< Render::Sampler >& sampler )
 276 {
 277   mImpl->samplerContainer.PushBack( sampler.Release() );
 278 }
 279
 280 void RenderManager::RemoveSampler( Render::Sampler* sampler )
 281 {
 282   mImpl->samplerContainer.EraseObject( sampler );
 283 }
 284
 285 void RenderManager::AddTexture( OwnerPointer< Render::Texture >& texture )
 286 {
 287   texture->Initialize( mImpl->context );
 288   mImpl->textureContainer.PushBack( texture.Release() );
 289 }
 290
 291 void RenderManager::RemoveTexture( Render::Texture* texture )
 292 {
 293   DALI_ASSERT_DEBUG( NULL != texture );
 294
 295   // Find the texture, use reference to pointer so we can do the erase safely
 296   for ( auto&& iter : mImpl->textureContainer )
 297   {
 298     if ( iter == texture )
 299     {
 300       texture->Destroy( mImpl->context );
 301       mImpl->textureContainer.Erase( &iter ); // Texture found; now destroy it
 302       return;
 303     }
 304   }
 305 }
 306
 307 void RenderManager::UploadTexture( Render::Texture* texture, PixelDataPtr pixelData, const Texture::UploadParams& params )
 308 {
 309   texture->Upload( mImpl->context, pixelData, params );
 310 }
 311
 312 void RenderManager::GenerateMipmaps( Render::Texture* texture )
 313 {
 314   texture->GenerateMipmaps( mImpl->context );
 315 }
 316
 317 void RenderManager::SetFilterMode( Render::Sampler* sampler, uint32_t minFilterMode, uint32_t magFilterMode )
 318 {
 319   sampler->mMinificationFilter = static_cast<Dali::FilterMode::Type>(minFilterMode);
 320   sampler->mMagnificationFilter = static_cast<Dali::FilterMode::Type>(magFilterMode );
 321 }
 322
 323 void RenderManager::SetWrapMode( Render::Sampler* sampler, uint32_t rWrapMode, uint32_t sWrapMode, uint32_t tWrapMode )
 324 {
 325   sampler->mRWrapMode = static_cast<Dali::WrapMode::Type>(rWrapMode);
 326   sampler->mSWrapMode = static_cast<Dali::WrapMode::Type>(sWrapMode);
 327   sampler->mTWrapMode = static_cast<Dali::WrapMode::Type>(tWrapMode);
 328 }
 329
 330 void RenderManager::AddFrameBuffer( OwnerPointer< Render::FrameBuffer >& frameBuffer )
 331 {
 332   Render::FrameBuffer* frameBufferPtr = frameBuffer.Release();
 333   mImpl->frameBufferContainer.PushBack( frameBufferPtr );
 334   if ( frameBufferPtr->IsSurfaceBacked() )
 335   {
 336     frameBufferPtr->Initialize( *mImpl->CreateSurfaceContext() );
 337   }
 338   else
 339   {
 340     frameBufferPtr->Initialize( mImpl->context );
 341   }
 342 }
 343
 344 void RenderManager::RemoveFrameBuffer( Render::FrameBuffer* frameBuffer )
 345 {
 346   DALI_ASSERT_DEBUG( NULL != frameBuffer );
 347
 348   // Find the sampler, use reference so we can safely do the erase
 349   for ( auto&& iter : mImpl->frameBufferContainer )
 350   {
 351     if ( iter == frameBuffer )
 352     {
 353       frameBuffer->Destroy( mImpl->context );
 354
 355       if ( frameBuffer->IsSurfaceBacked() )
 356       {
 357         auto surfaceFrameBuffer = static_cast<Render::SurfaceFrameBuffer*>( frameBuffer );
 358         mImpl->DestroySurfaceContext( surfaceFrameBuffer->GetContext() );
 359       }
 360
 361       mImpl->frameBufferContainer.Erase( &iter ); // frameBuffer found; now destroy it
 362
 363       break;
 364     }
 365   }
 366 }
 367
 368 void RenderManager::AttachColorTextureToFrameBuffer( Render::FrameBuffer* frameBuffer, Render::Texture* texture, uint32_t mipmapLevel, uint32_t layer )
 369 {
 370   if ( !frameBuffer->IsSurfaceBacked() )
 371   {
 372     auto textureFrameBuffer = static_cast<Render::TextureFrameBuffer*>( frameBuffer );
 373     textureFrameBuffer->AttachColorTexture( mImpl->context, texture, mipmapLevel, layer );
 374   }
 375 }
 376
 377 void RenderManager::AddPropertyBuffer( OwnerPointer< Render::PropertyBuffer >& propertyBuffer )
 378 {
 379   mImpl->propertyBufferContainer.PushBack( propertyBuffer.Release() );
 380 }
 381
 382 void RenderManager::RemovePropertyBuffer( Render::PropertyBuffer* propertyBuffer )
 383 {
 384   mImpl->propertyBufferContainer.EraseObject( propertyBuffer );
 385 }
 386
 387 void RenderManager::SetPropertyBufferFormat( Render::PropertyBuffer* propertyBuffer, OwnerPointer< Render::PropertyBuffer::Format>& format )
 388 {
 389   propertyBuffer->SetFormat( format.Release() );
 390 }
 391
 392 void RenderManager::SetPropertyBufferData( Render::PropertyBuffer* propertyBuffer, OwnerPointer< Vector<uint8_t> >& data, uint32_t size )
 393 {
 394   propertyBuffer->SetData( data.Release(), size );
 395 }
 396
 397 void RenderManager::SetIndexBuffer( Render::Geometry* geometry, Dali::Vector<uint16_t>& indices )
 398 {
 399   geometry->SetIndexBuffer( indices );
 400 }
 401
 402 void RenderManager::AddGeometry( OwnerPointer< Render::Geometry >& geometry )
 403 {
 404   mImpl->geometryContainer.PushBack( geometry.Release() );
 405 }
 406
 407 void RenderManager::RemoveGeometry( Render::Geometry* geometry )
 408 {
 409   mImpl->geometryContainer.EraseObject( geometry );
 410 }
 411
 412 void RenderManager::AttachVertexBuffer( Render::Geometry* geometry, Render::PropertyBuffer* propertyBuffer )
 413 {
 414   DALI_ASSERT_DEBUG( NULL != geometry );
 415
 416   // Find the geometry
 417   for ( auto&& iter : mImpl->geometryContainer )
 418   {
 419     if ( iter == geometry )
 420     {
 421       iter->AddPropertyBuffer( propertyBuffer );
 422       break;
 423     }
 424   }
 425 }
 426
 427 void RenderManager::RemoveVertexBuffer( Render::Geometry* geometry, Render::PropertyBuffer* propertyBuffer )
 428 {
 429   DALI_ASSERT_DEBUG( NULL != geometry );
 430
 431   // Find the geometry
 432   for ( auto&& iter : mImpl->geometryContainer )
 433   {
 434     if ( iter == geometry )
 435     {
 436       iter->RemovePropertyBuffer( propertyBuffer );
 437       break;
 438     }
 439   }
 440 }
 441
 442 void RenderManager::SetGeometryType( Render::Geometry* geometry, uint32_t geometryType )
 443 {
 444   geometry->SetType( Render::Geometry::Type(geometryType) );
 445 }
 446
 447 void RenderManager::AddRenderTracker( Render::RenderTracker* renderTracker )
 448 {
 449   mImpl->AddRenderTracker(renderTracker);
 450 }
 451
 452 void RenderManager::RemoveRenderTracker( Render::RenderTracker* renderTracker )
 453 {
 454   mImpl->RemoveRenderTracker(renderTracker);
 455 }
 456
 457 ProgramCache* RenderManager::GetProgramCache()
 458 {
 459   return &(mImpl->programController);
 460 }
 461
 462 void RenderManager::Render( Integration::RenderStatus& status, bool forceClear, bool uploadOnly )
 463 {
 464   DALI_PRINT_RENDER_START( mImpl->renderBufferIndex );
 465
 466   // Core::Render documents that GL context must be current before calling Render
 467   DALI_ASSERT_DEBUG( mImpl->context.IsGlContextCreated() );
 468
 469   // Increment the frame count at the beginning of each frame
 470   ++mImpl->frameCount;
 471
 472   // Process messages queued during previous update
 473   mImpl->renderQueue.ProcessMessages( mImpl->renderBufferIndex );
 474
 475   const uint32_t count = mImpl->instructions.Count( mImpl->renderBufferIndex );
 476   const bool haveInstructions = count > 0u;
 477
 478   DALI_LOG_INFO( gLogFilter, Debug::General,
 479                  "Render: haveInstructions(%s) || mImpl->lastFrameWasRendered(%s) || forceClear(%s)\n",
 480                  haveInstructions ? "true" : "false",
 481                  mImpl->lastFrameWasRendered ? "true" : "false",
 482                  forceClear ? "true" : "false" );
 483
 484   // Only render if we have instructions to render, or the last frame was rendered (and therefore a clear is required).
 485   if( haveInstructions || mImpl->lastFrameWasRendered || forceClear )
 486   {
 487     DALI_LOG_INFO( gLogFilter, Debug::General, "Render: Processing\n" );
 488
 489     if ( !uploadOnly )
 490     {
 491       // Mark that we will require a post-render step to be performed (includes swap-buffers).
 492       status.SetNeedsPostRender( true );
 493     }
 494
 495     // Switch to the shared context
 496     if ( mImpl->currentContext != &mImpl->context )
 497     {
 498       mImpl->currentContext = &mImpl->context;
 499
 500       if ( mImpl->currentContext->IsSurfacelessContextSupported() )
 501       {
 502         mImpl->glContextHelperAbstraction.MakeSurfacelessContextCurrent();
 503       }
 504
 505       // Clear the current cached program when the context is switched
 506       mImpl->programController.ClearCurrentProgram();
 507     }
 508
 509     // Upload the geometries
 510     for( uint32_t i = 0; i < count; ++i )
 511     {
 512       RenderInstruction& instruction = mImpl->instructions.At( mImpl->renderBufferIndex, i );
 513
 514       const Matrix* viewMatrix       = instruction.GetViewMatrix( mImpl->renderBufferIndex );
 515       const Matrix* projectionMatrix = instruction.GetProjectionMatrix( mImpl->renderBufferIndex );
 516
 517       DALI_ASSERT_DEBUG( viewMatrix );
 518       DALI_ASSERT_DEBUG( projectionMatrix );
 519
 520       if( viewMatrix && projectionMatrix )
 521       {
 522         const RenderListContainer::SizeType renderListCount = instruction.RenderListCount();
 523
 524         // Iterate through each render list.
 525         for( RenderListContainer::SizeType index = 0; index < renderListCount; ++index )
 526         {
 527           const RenderList* renderList = instruction.GetRenderList( index );
 528
 529           if( renderList && !renderList->IsEmpty() )
 530           {
 531             const std::size_t itemCount = renderList->Count();
 532             for( uint32_t itemIndex = 0u; itemIndex < itemCount; ++itemIndex )
 533             {
 534               const RenderItem& item = renderList->GetItem( itemIndex );
 535               if( DALI_LIKELY( item.mRenderer ) )
 536               {
 537                 item.mRenderer->Upload( *mImpl->currentContext );
 538               }
 539             }
 540           }
 541         }
 542       }
 543     }
 544
 545     if ( !uploadOnly )
 546     {
 547       for( uint32_t i = 0; i < count; ++i )
 548       {
 549         RenderInstruction& instruction = mImpl->instructions.At( mImpl->renderBufferIndex, i );
 550
 551         DoRender( instruction );
 552       }
 553
 554       if ( mImpl->currentContext->IsSurfacelessContextSupported() )
 555       {
 556         mImpl->glContextHelperAbstraction.MakeSurfacelessContextCurrent();
 557       }
 558
 559       GLenum attachments[] = { GL_DEPTH, GL_STENCIL };
 560       mImpl->context.InvalidateFramebuffer(GL_FRAMEBUFFER, 2, attachments);
 561       for ( auto&& context : mImpl->surfaceContextContainer )
 562       {
 563         context->InvalidateFramebuffer(GL_FRAMEBUFFER, 2, attachments);
 564       }
 565     }
 566
 567     //Notify RenderGeometries that rendering has finished
 568     for ( auto&& iter : mImpl->geometryContainer )
 569     {
 570       iter->OnRenderFinished();
 571     }
 572   }
 573   else
 574   {
 575     DALI_LOG_RELEASE_INFO( "RenderManager::Render: Skip rendering [%d, %d, %d]\n", haveInstructions, mImpl->lastFrameWasRendered, forceClear );
 576   }
 577
 578   mImpl->UpdateTrackers();
 579
 580   // If this frame was rendered due to instructions existing, we mark this so we know to clear the next frame.
 581   mImpl->lastFrameWasRendered = haveInstructions;
 582
 583   /**
 584    * The rendering has finished; swap to the next buffer.
 585    * Ideally the update has just finished using this buffer; otherwise the render thread
 586    * should block until the update has finished.
 587    */
 588   mImpl->renderBufferIndex = (0 != mImpl->renderBufferIndex) ? 0 : 1;
 589
 590   DALI_PRINT_RENDER_END();
 591 }
 592
 593 void RenderManager::DoRender( RenderInstruction& instruction )
 594 {
 595   Rect<int32_t> viewportRect;
 596   Vector4   clearColor;
 597
 598   if ( instruction.mIsClearColorSet )
 599   {
 600     clearColor = instruction.mClearColor;
 601   }
 602   else
 603   {
 604     clearColor = Dali::RenderTask::DEFAULT_CLEAR_COLOR;
 605   }
 606
 607   Rect<int32_t> surfaceRect = mImpl->defaultSurfaceRect;
 608   Vector4 backgroundColor = mImpl->backgroundColor;
 609   Integration::DepthBufferAvailable depthBufferAvailable = mImpl->depthBufferAvailable;
 610   Integration::StencilBufferAvailable stencilBufferAvailable = mImpl->stencilBufferAvailable;
 611
 612   Render::SurfaceFrameBuffer* surfaceFrameBuffer = nullptr;
 613   if ( instruction.mFrameBuffer != 0 )
 614   {
 615     if ( instruction.mFrameBuffer->IsSurfaceBacked() )
 616     {
 617       surfaceFrameBuffer = static_cast<Render::SurfaceFrameBuffer*>( instruction.mFrameBuffer );
 618
 619       if ( !surfaceFrameBuffer->IsSurfaceValid() )
 620       {
 621         // Skip rendering the frame buffer if the render surface becomes invalid
 622         return;
 623       }
 624
 625       if ( mImpl->currentContext->IsSurfacelessContextSupported() )
 626       {
 627         Context* surfaceContext = surfaceFrameBuffer->GetContext();
 628         if ( mImpl->currentContext != surfaceContext )
 629         {
 630           // Switch the correct context if rendering to a surface
 631           mImpl->currentContext = surfaceContext;
 632           surfaceFrameBuffer->MakeContextCurrent();
 633
 634           // Clear the current cached program when the context is switched
 635           mImpl->programController.ClearCurrentProgram();
 636         }
 637       }
 638
 639       surfaceRect = Rect<int32_t>( 0, 0, static_cast<int32_t>( surfaceFrameBuffer->GetWidth() ), static_cast<int32_t>( surfaceFrameBuffer->GetHeight() ) );
 640       backgroundColor = surfaceFrameBuffer->GetBackgroundColor();
 641     }
 642     else
 643     {
 644       // Switch to shared context for off-screen buffer
 645       mImpl->currentContext = &mImpl->context;
 646
 647       if ( mImpl->currentContext->IsSurfacelessContextSupported() )
 648       {
 649         mImpl->glContextHelperAbstraction.MakeSurfacelessContextCurrent();
 650       }
 651     }
 652   }
 653
 654   DALI_ASSERT_DEBUG( mImpl->currentContext->IsGlContextCreated() );
 655
 656   // reset the program matrices for all programs once per frame
 657   // this ensures we will set view and projection matrix once per program per camera
 658   mImpl->programController.ResetProgramMatrices();
 659
 660   if( instruction.mFrameBuffer )
 661   {
 662     instruction.mFrameBuffer->Bind( *mImpl->currentContext );
 663
 664     if ( !instruction.mFrameBuffer->IsSurfaceBacked() )
 665     {
 666       // For each offscreen buffer, update the dependency list with the new texture id used by this frame buffer.
 667       Render::TextureFrameBuffer* textureFrameBuffer = static_cast<Render::TextureFrameBuffer*>( instruction.mFrameBuffer );
 668       mImpl->textureDependencyList.PushBack( textureFrameBuffer->GetTextureId() );
 669     }
 670   }
 671   else
 672   {
 673     mImpl->currentContext->BindFramebuffer( GL_FRAMEBUFFER, 0u );
 674   }
 675
 676   if ( surfaceFrameBuffer )
 677   {
 678     mImpl->currentContext->Viewport( surfaceRect.x,
 679                               surfaceRect.y,
 680                               surfaceRect.width,
 681                               surfaceRect.height );
 682
 683     mImpl->currentContext->ClearColor( backgroundColor.r,
 684                                 backgroundColor.g,
 685                                 backgroundColor.b,
 686                                 backgroundColor.a );
 687   }
 688
 689   // Clear the entire color, depth and stencil buffers for the default framebuffer, if required.
 690   // It is important to clear all 3 buffers when they are being used, for performance on deferred renderers
 691   // e.g. previously when the depth & stencil buffers were NOT cleared, it caused the DDK to exceed a "vertex count limit",
 692   // and then stall. That problem is only noticeable when rendering a large number of vertices per frame.
 693
 694   mImpl->currentContext->SetScissorTest( false );
 695
 696   GLbitfield clearMask = GL_COLOR_BUFFER_BIT;
 697
 698   mImpl->currentContext->ColorMask( true );
 699
 700   if( depthBufferAvailable == Integration::DepthBufferAvailable::TRUE )
 701   {
 702     mImpl->currentContext->DepthMask( true );
 703     clearMask |= GL_DEPTH_BUFFER_BIT;
 704   }
 705
 706   if( stencilBufferAvailable == Integration::StencilBufferAvailable::TRUE)
 707   {
 708     mImpl->currentContext->ClearStencil( 0 );
 709     mImpl->currentContext->StencilMask( 0xFF ); // 8 bit stencil mask, all 1's
 710     clearMask |= GL_STENCIL_BUFFER_BIT;
 711   }
 712
 713   mImpl->currentContext->Clear( clearMask, Context::FORCE_CLEAR );
 714
 715   if( !instruction.mIgnoreRenderToFbo && ( instruction.mFrameBuffer != 0 ) )
 716   {
 717     if ( instruction.mFrameBuffer->IsSurfaceBacked() ) // Surface rendering
 718     {
 719       if ( instruction.mIsViewportSet )
 720       {
 721         // For glViewport the lower-left corner is (0,0)
 722         // For glViewport the lower-left corner is (0,0)
 723         const int32_t y = ( surfaceRect.height - instruction.mViewport.height ) - instruction.mViewport.y;
 724         viewportRect.Set( instruction.mViewport.x,  y, instruction.mViewport.width, instruction.mViewport.height );
 725       }
 726       else
 727       {
 728         viewportRect = surfaceRect;
 729       }
 730     }
 731     else // Offscreen buffer rendering
 732     {
 733       if ( instruction.mIsViewportSet )
 734       {
 735         // For glViewport the lower-left corner is (0,0)
 736         const int32_t y = ( instruction.mFrameBuffer->GetHeight() - instruction.mViewport.height ) - instruction.mViewport.y;
 737         viewportRect.Set( instruction.mViewport.x,  y, instruction.mViewport.width, instruction.mViewport.height );
 738       }
 739       else
 740       {
 741         viewportRect.Set( 0, 0, instruction.mFrameBuffer->GetWidth(), instruction.mFrameBuffer->GetHeight() );
 742       }
 743     }
 744   }
 745   else // No Offscreen frame buffer rendering
 746   {
 747     // Check whether a viewport is specified, otherwise the full surface size is used
 748     if ( instruction.mFrameBuffer != 0 )
 749     {
 750       if ( instruction.mIsViewportSet )
 751       {
 752         // For glViewport the lower-left corner is (0,0)
 753         const int32_t y = ( instruction.mFrameBuffer->GetHeight() - instruction.mViewport.height ) - instruction.mViewport.y;
 754         viewportRect.Set( instruction.mViewport.x,  y, instruction.mViewport.width, instruction.mViewport.height );
 755       }
 756       else
 757       {
 758         viewportRect.Set( 0, 0, instruction.mFrameBuffer->GetWidth(), instruction.mFrameBuffer->GetHeight() );
 759       }
 760     }
 761     else
 762     {
 763       viewportRect = surfaceRect;
 764     }
 765   }
 766
 767   mImpl->currentContext->Viewport(viewportRect.x, viewportRect.y, viewportRect.width, viewportRect.height);
 768
 769   if ( instruction.mIsClearColorSet )
 770   {
 771     mImpl->currentContext->ClearColor( clearColor.r,
 772                                        clearColor.g,
 773                                        clearColor.b,
 774                                        clearColor.a );
 775
 776     // Clear the viewport area only
 777     mImpl->currentContext->SetScissorTest( true );
 778     mImpl->currentContext->Scissor( viewportRect.x, viewportRect.y, viewportRect.width, viewportRect.height );
 779     mImpl->currentContext->ColorMask( true );
 780     mImpl->currentContext->Clear( GL_COLOR_BUFFER_BIT , Context::CHECK_CACHED_VALUES );
 781     mImpl->currentContext->SetScissorTest( false );
 782   }
 783
 784   // Clear the list of bound textures
 785   mImpl->boundTextures.Clear();
 786
 787   mImpl->renderAlgorithms.ProcessRenderInstruction(
 788       instruction,
 789       *mImpl->currentContext,
 790       mImpl->renderBufferIndex,
 791       depthBufferAvailable,
 792       stencilBufferAvailable,
 793       mImpl->boundTextures );
 794
 795   // Synchronise the FBO/Texture access when there are multiple contexts
 796   if ( mImpl->currentContext->IsSurfacelessContextSupported() )
 797   {
 798     // Check whether any binded texture is in the dependency list
 799     bool textureFound = false;
 800
 801     if ( mImpl->boundTextures.Count() > 0u && mImpl->textureDependencyList.Count() > 0u )
 802     {
 803       for ( auto textureId : mImpl->textureDependencyList )
 804       {
 805
 806         textureFound = std::find_if( mImpl->boundTextures.Begin(), mImpl->boundTextures.End(),
 807                                      [textureId]( GLuint id )
 808                                      {
 809                                        return textureId == id;
 810                                      } ) != mImpl->boundTextures.End();
 811       }
 812     }
 813
 814     if ( textureFound )
 815     {
 816
 817       if ( !instruction.mFrameBuffer || !instruction.mFrameBuffer->IsSurfaceBacked() )
 818       {
 819         // For off-screen buffer
 820
 821         // Wait until all rendering calls for the currently context are executed
 822         mImpl->glContextHelperAbstraction.WaitClient();
 823
 824         // Clear the dependency list
 825         mImpl->textureDependencyList.Clear();
 826       }
 827       else
 828       {
 829         // For surface-backed frame buffer
 830
 831         // Worker thread lambda function
 832         auto& glContextHelperAbstraction = mImpl->glContextHelperAbstraction;
 833         auto workerFunction = [&glContextHelperAbstraction]( int workerThread )
 834         {
 835           // Switch to the shared context in the worker thread
 836           glContextHelperAbstraction.MakeSurfacelessContextCurrent();
 837
 838           // Wait until all rendering calls for the shared context are executed
 839           glContextHelperAbstraction.WaitClient();
 840
 841           // Must clear the context in the worker thread
 842           // Otherwise the shared context cannot be switched to from the render thread
 843           glContextHelperAbstraction.MakeContextNull();
 844         };
 845
 846         auto future = mImpl->threadPool->SubmitTask( 0u, workerFunction );
 847         if ( future )
 848         {
 849           mImpl->threadPool->Wait();
 850
 851           // Clear the dependency list
 852           mImpl->textureDependencyList.Clear();
 853         }
 854       }
 855     }
 856   }
 857
 858   if( instruction.mRenderTracker && ( instruction.mFrameBuffer != 0 ) )
 859   {
 860     // This will create a sync object every frame this render tracker
 861     // is alive (though it should be now be created only for
 862     // render-once render tasks)
 863     instruction.mRenderTracker->CreateSyncObject( mImpl->glSyncAbstraction );
 864     instruction.mRenderTracker = NULL; // Only create once.
 865   }
 866
 867   if ( surfaceFrameBuffer )
 868   {
 869     surfaceFrameBuffer->PostRender();
 870   }
 871   else
 872   {
 873     mImpl->currentContext->Flush();
 874   }
 875 }
 876
 877 } // namespace SceneGraph
 878
 879 } // namespace Internal
 880
 881 } // namespace Dali