dali/internal/graphics/gles-impl/gles-context.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
  18 #include "gles-context.h"
  19 #include <dali/integration-api/adaptor-framework/render-surface-interface.h>
  20 #include <dali/integration-api/gl-abstraction.h>
  21 #include <dali/integration-api/gl-defines.h>
  22 #include <dali/internal/graphics/common/graphics-interface.h>
  23
  24 #include "egl-graphics-controller.h"
  25 #include "gles-graphics-buffer.h"
  26 #include "gles-graphics-pipeline.h"
  27 #include "gles-graphics-program.h"
  28 #include "gles-graphics-render-pass.h"
  29 #include "gles-graphics-render-target.h"
  30
  31 #include <map>
  32
  33 namespace Dali::Graphics::GLES
  34 {
  35 struct Context::Impl
  36 {
  37   Impl(EglGraphicsController& controller)
  38   : mController(controller)
  39   {
  40   }
  41
  42   ~Impl() = default;
  43
  44   /**
  45    * Binds (and creates) VAO
  46    *
  47    * VAO is fixed per program so it has to be created only once assuming
  48    * that VertexInputState has been set correctly for the pipeline.
  49    *
  50    */
  51   void BindProgramVAO(GLES::ProgramImpl* program, const VertexInputState& vertexInputState)
  52   {
  53     auto& gl   = *mController.GetGL();
  54     auto  iter = mProgramVAOMap.find(program);
  55     if(iter != mProgramVAOMap.end())
  56     {
  57       if(mProgramVAOCurrentState != iter->second)
  58       {
  59         mProgramVAOCurrentState = iter->second;
  60         gl.BindVertexArray(iter->second);
  61       }
  62       return;
  63     }
  64
  65     uint32_t vao;
  66     gl.GenVertexArrays(1, &vao);
  67     gl.BindVertexArray(vao);
  68     mProgramVAOMap[program] = vao;
  69     for(const auto& attr : vertexInputState.attributes)
  70     {
  71       gl.EnableVertexAttribArray(attr.location);
  72     }
  73
  74     mProgramVAOCurrentState = vao;
  75   }
  76
  77   /**
  78    * Sets the initial GL state.
  79    */
  80   void InitializeGlState()
  81   {
  82     auto& gl = *mController.GetGL();
  83
  84     mGlStateCache.mClearColorSet        = false;
  85     mGlStateCache.mColorMask            = true;
  86     mGlStateCache.mStencilMask          = 0xFF;
  87     mGlStateCache.mBlendEnabled         = false;
  88     mGlStateCache.mDepthBufferEnabled   = false;
  89     mGlStateCache.mDepthMaskEnabled     = false;
  90     mGlStateCache.mScissorTestEnabled   = false;
  91     mGlStateCache.mStencilBufferEnabled = false;
  92
  93     gl.Disable(GL_DITHER);
  94
  95     mGlStateCache.mBoundArrayBufferId        = 0;
  96     mGlStateCache.mBoundElementArrayBufferId = 0;
  97     mGlStateCache.mActiveTextureUnit         = 0;
  98
  99     mGlStateCache.mBlendFuncSeparateSrcRGB   = BlendFactor::ONE;
 100     mGlStateCache.mBlendFuncSeparateDstRGB   = BlendFactor::ZERO;
 101     mGlStateCache.mBlendFuncSeparateSrcAlpha = BlendFactor::ONE;
 102     mGlStateCache.mBlendFuncSeparateDstAlpha = BlendFactor::ZERO;
 103
 104     // initial state is GL_FUNC_ADD for both RGB and Alpha blend modes
 105     mGlStateCache.mBlendEquationSeparateModeRGB   = BlendOp::ADD;
 106     mGlStateCache.mBlendEquationSeparateModeAlpha = BlendOp::ADD;
 107
 108     mGlStateCache.mCullFaceMode = CullMode::NONE; //By default cullface is disabled, front face is set to CCW and cull face is set to back
 109
 110     //Initialze vertex attribute cache
 111     memset(&mGlStateCache.mVertexAttributeCachedState, 0, sizeof(mGlStateCache.mVertexAttributeCachedState));
 112     memset(&mGlStateCache.mVertexAttributeCurrentState, 0, sizeof(mGlStateCache.mVertexAttributeCurrentState));
 113
 114     //Initialize bound 2d texture cache
 115     memset(&mGlStateCache.mBoundTextureId, 0, sizeof(mGlStateCache.mBoundTextureId));
 116
 117     mGlStateCache.mFrameBufferStateCache.Reset();
 118   }
 119
 120   /**
 121    * Flushes vertex attribute location changes to the driver
 122    */
 123   void FlushVertexAttributeLocations()
 124   {
 125     auto& gl = *mController.GetGL();
 126
 127     for(unsigned int i = 0; i < MAX_ATTRIBUTE_CACHE_SIZE; ++i)
 128     {
 129       // see if the cached state is different to the actual state
 130       if(mGlStateCache.mVertexAttributeCurrentState[i] != mGlStateCache.mVertexAttributeCachedState[i])
 131       {
 132         // it's different so make the change to the driver and update the cached state
 133         mGlStateCache.mVertexAttributeCurrentState[i] = mGlStateCache.mVertexAttributeCachedState[i];
 134
 135         if(mGlStateCache.mVertexAttributeCurrentState[i])
 136         {
 137           gl.EnableVertexAttribArray(i);
 138         }
 139         else
 140         {
 141           gl.DisableVertexAttribArray(i);
 142         }
 143       }
 144     }
 145   }
 146
 147   /**
 148    * Either enables or disables a vertex attribute location in the cache
 149    * The cahnges won't take affect until FlushVertexAttributeLocations is called
 150    * @param location attribute location
 151    * @param state attribute state
 152    */
 153   void SetVertexAttributeLocation(unsigned int location, bool state)
 154   {
 155     auto& gl = *mController.GetGL();
 156
 157     if(location >= MAX_ATTRIBUTE_CACHE_SIZE)
 158     {
 159       // not cached, make the gl call through context
 160       if(state)
 161       {
 162         gl.EnableVertexAttribArray(location);
 163       }
 164       else
 165       {
 166         gl.DisableVertexAttribArray(location);
 167       }
 168     }
 169     else
 170     {
 171       // set the cached state, it will be set at the next draw call
 172       // if it's different from the current driver state
 173       mGlStateCache.mVertexAttributeCachedState[location] = state;
 174     }
 175   }
 176
 177   EglGraphicsController& mController;
 178
 179   const GLES::PipelineImpl* mCurrentPipeline{nullptr}; ///< Currently bound pipeline
 180   const GLES::PipelineImpl* mNewPipeline{nullptr};     ///< New pipeline to be set on flush
 181
 182   std::vector<Graphics::TextureBinding> mCurrentTextureBindings{};
 183   std::vector<Graphics::SamplerBinding> mCurrentSamplerBindings{};
 184   GLES::IndexBufferBindingDescriptor    mCurrentIndexBufferBinding{};
 185
 186   struct VertexBufferBinding
 187   {
 188     GLES::Buffer* buffer{nullptr};
 189     uint32_t      offset{0u};
 190   };
 191
 192   // Currently bound buffers
 193   std::vector<VertexBufferBindingDescriptor> mCurrentVertexBufferBindings{};
 194
 195   // Currently bound UBOs (check if it's needed per program!)
 196   std::vector<UniformBufferBindingDescriptor> mCurrentUBOBindings{};
 197   UniformBufferBindingDescriptor              mCurrentStandaloneUBOBinding{};
 198
 199   // Current render pass and render target
 200   const GLES::RenderTarget* mCurrentRenderTarget{nullptr};
 201   const GLES::RenderPass*   mCurrentRenderPass{nullptr};
 202
 203   // Each context must have own VAOs as they cannot be shared
 204   std::map<GLES::ProgramImpl*, uint32_t> mProgramVAOMap;              ///< GL program-VAO map
 205   uint32_t                               mProgramVAOCurrentState{0u}; ///< Currently bound VAO
 206   GLStateCache                           mGlStateCache{};             ///< GL status cache
 207
 208   bool mGlContextCreated{false}; ///< True if the OpenGL context has been created
 209 };
 210
 211 Context::Context(EglGraphicsController& controller)
 212 {
 213   mImpl = std::make_unique<Impl>(controller);
 214 }
 215
 216 Context::~Context() = default;
 217
 218 void Context::Flush(bool reset, const GLES::DrawCallDescriptor& drawCall)
 219 {
 220   auto& gl = *mImpl->mController.GetGL();
 221
 222   static const bool hasGLES3(mImpl->mController.GetGLESVersion() >= GLESVersion::GLES_30);
 223
 224   // early out if neither current nor new pipelines are set
 225   // this behaviour may be valid so no assert
 226   if(!mImpl->mCurrentPipeline && !mImpl->mNewPipeline)
 227   {
 228     return;
 229   }
 230
 231   // Execute states if pipeline is changed
 232   const auto currentProgram = mImpl->mCurrentPipeline ? static_cast<const GLES::Program*>(mImpl->mCurrentPipeline->GetCreateInfo().programState->program) : nullptr;
 233
 234   // case when new pipeline has been set
 235   const GLES::Program* newProgram = nullptr;
 236
 237   if(mImpl->mNewPipeline)
 238   {
 239     newProgram = static_cast<const GLES::Program*>(mImpl->mNewPipeline->GetCreateInfo().programState->program);
 240   }
 241
 242   if(mImpl->mNewPipeline && mImpl->mCurrentPipeline != mImpl->mNewPipeline)
 243   {
 244     if(!currentProgram || currentProgram->GetImplementation()->GetGlProgram() != newProgram->GetImplementation()->GetGlProgram())
 245     {
 246       mImpl->mNewPipeline->Bind(newProgram->GetImplementation()->GetGlProgram());
 247     }
 248
 249     // Blend state
 250     ResolveBlendState();
 251
 252     // Resolve rasterization state
 253     ResolveRasterizationState();
 254   }
 255
 256   // Resolve uniform buffers
 257   ResolveUniformBuffers();
 258
 259   // Bind textures
 260   // Map binding# to sampler location
 261   const auto& reflection = !newProgram ? currentProgram->GetReflection() : newProgram->GetReflection();
 262   const auto& samplers   = reflection.GetSamplers();
 263   for(const auto& binding : mImpl->mCurrentTextureBindings)
 264   {
 265     auto texture = const_cast<GLES::Texture*>(static_cast<const GLES::Texture*>(binding.texture));
 266
 267     // Texture may not have been initialized yet...(tbm_surface timing issue?)
 268     if(!texture->GetGLTexture())
 269     {
 270       // Attempt to reinitialize
 271       // @todo need to put this somewhere else where it isn't const.
 272       // Maybe post it back on end of initialize queue if initialization fails?
 273       texture->InitializeResource();
 274     }
 275
 276     texture->Bind(binding);
 277
 278     texture->Prepare(); // @todo also non-const.
 279
 280     if(binding.binding < samplers.size()) // binding maps to texture unit. (texture bindings should also be in binding order)
 281     {
 282       // Offset is set to the lexical offset within the frag shader, map it to the texture unit
 283       // @todo Explicitly set the texture unit through the graphics interface
 284       gl.Uniform1i(samplers[binding.binding].location, samplers[binding.binding].offset);
 285     }
 286   }
 287
 288   // for each attribute bind vertices
 289
 290   const auto& pipelineState    = mImpl->mNewPipeline ? mImpl->mNewPipeline->GetCreateInfo() : mImpl->mCurrentPipeline->GetCreateInfo();
 291   const auto& vertexInputState = pipelineState.vertexInputState;
 292
 293   if(hasGLES3)
 294   {
 295     mImpl->BindProgramVAO(static_cast<const GLES::Program*>(pipelineState.programState->program)->GetImplementation(), *vertexInputState);
 296   }
 297
 298   for(const auto& attr : vertexInputState->attributes)
 299   {
 300     // Enable location
 301     if(!hasGLES3)
 302     {
 303       mImpl->SetVertexAttributeLocation(attr.location, true);
 304     }
 305
 306     const auto& bufferSlot    = mImpl->mCurrentVertexBufferBindings[attr.binding];
 307     const auto& bufferBinding = vertexInputState->bufferBindings[attr.binding];
 308
 309     auto glesBuffer = bufferSlot.buffer->GetGLBuffer();
 310
 311     // Bind buffer
 312     BindBuffer(GL_ARRAY_BUFFER, glesBuffer);
 313
 314     gl.VertexAttribPointer(attr.location,
 315                            GLVertexFormat(attr.format).size,
 316                            GLVertexFormat(attr.format).format,
 317                            GL_FALSE,
 318                            bufferBinding.stride,
 319                            reinterpret_cast<void*>(attr.offset));
 320   }
 321
 322   // Resolve topology
 323   const auto& ia = pipelineState.inputAssemblyState;
 324
 325   // Bind uniforms
 326
 327   // Resolve draw call
 328   switch(drawCall.type)
 329   {
 330     case DrawCallDescriptor::Type::DRAW:
 331     {
 332       mImpl->mGlStateCache.mFrameBufferStateCache.DrawOperation(mImpl->mGlStateCache.mColorMask,
 333                                                                 mImpl->mGlStateCache.DepthBufferWriteEnabled(),
 334                                                                 mImpl->mGlStateCache.StencilBufferWriteEnabled());
 335       // For GLES3+ we use VAO, for GLES2 internal cache
 336       if(!hasGLES3)
 337       {
 338         mImpl->FlushVertexAttributeLocations();
 339       }
 340
 341       gl.DrawArrays(GLESTopology(ia->topology),
 342                     drawCall.draw.firstVertex,
 343                     drawCall.draw.vertexCount);
 344       break;
 345     }
 346     case DrawCallDescriptor::Type::DRAW_INDEXED:
 347     {
 348       const auto& binding = mImpl->mCurrentIndexBufferBinding;
 349       BindBuffer(GL_ELEMENT_ARRAY_BUFFER, binding.buffer->GetGLBuffer());
 350
 351       mImpl->mGlStateCache.mFrameBufferStateCache.DrawOperation(mImpl->mGlStateCache.mColorMask,
 352                                                                 mImpl->mGlStateCache.DepthBufferWriteEnabled(),
 353                                                                 mImpl->mGlStateCache.StencilBufferWriteEnabled());
 354
 355       // For GLES3+ we use VAO, for GLES2 internal cache
 356       if(!hasGLES3)
 357       {
 358         mImpl->FlushVertexAttributeLocations();
 359       }
 360
 361       auto indexBufferFormat = GLIndexFormat(binding.format).format;
 362       gl.DrawElements(GLESTopology(ia->topology),
 363                       drawCall.drawIndexed.indexCount,
 364                       indexBufferFormat,
 365                       reinterpret_cast<void*>(binding.offset));
 366       break;
 367     }
 368     case DrawCallDescriptor::Type::DRAW_INDEXED_INDIRECT:
 369     {
 370       break;
 371     }
 372   }
 373
 374   ClearState();
 375
 376   // Change pipeline
 377   if(mImpl->mNewPipeline)
 378   {
 379     mImpl->mCurrentPipeline = mImpl->mNewPipeline;
 380     mImpl->mNewPipeline     = nullptr;
 381   }
 382 }
 383
 384 void Context::BindTextures(const Graphics::TextureBinding* bindings, uint32_t count)
 385 {
 386   // for each texture allocate slot
 387   for(auto i = 0u; i < count; ++i)
 388   {
 389     auto& binding = bindings[i];
 390
 391     // Resize binding array if needed
 392     if(mImpl->mCurrentTextureBindings.size() <= binding.binding)
 393     {
 394       mImpl->mCurrentTextureBindings.resize(binding.binding + 1);
 395     }
 396     // Store the binding details
 397     mImpl->mCurrentTextureBindings[binding.binding] = binding;
 398   }
 399 }
 400
 401 void Context::BindVertexBuffers(const GLES::VertexBufferBindingDescriptor* bindings, uint32_t count)
 402 {
 403   if(count > mImpl->mCurrentVertexBufferBindings.size())
 404   {
 405     mImpl->mCurrentVertexBufferBindings.resize(count);
 406   }
 407   // Copy only set slots
 408   std::copy_if(bindings, bindings + count, mImpl->mCurrentVertexBufferBindings.begin(), [](auto& item) {
 409     return (nullptr != item.buffer);
 410   });
 411 }
 412
 413 void Context::BindIndexBuffer(const IndexBufferBindingDescriptor& indexBufferBinding)
 414 {
 415   mImpl->mCurrentIndexBufferBinding = indexBufferBinding;
 416 }
 417
 418 void Context::BindPipeline(const GLES::Pipeline* newPipeline)
 419 {
 420   DALI_ASSERT_ALWAYS(newPipeline && "Invalid pipeline");
 421   mImpl->mNewPipeline = &newPipeline->GetPipeline();
 422 }
 423
 424 void Context::BindUniformBuffers(const UniformBufferBindingDescriptor* uboBindings,
 425                                  uint32_t                              uboCount,
 426                                  const UniformBufferBindingDescriptor& standaloneBindings)
 427 {
 428   if(standaloneBindings.buffer)
 429   {
 430     mImpl->mCurrentStandaloneUBOBinding = standaloneBindings;
 431   }
 432
 433   if(uboCount >= mImpl->mCurrentUBOBindings.size())
 434   {
 435     mImpl->mCurrentUBOBindings.resize(uboCount + 1);
 436   }
 437
 438   auto it = uboBindings;
 439   for(auto i = 0u; i < uboCount; ++i)
 440   {
 441     if(it->buffer)
 442     {
 443       mImpl->mCurrentUBOBindings[i] = *it;
 444     }
 445   }
 446 }
 447
 448 void Context::ResolveBlendState()
 449 {
 450   const auto& currentBlendState = mImpl->mCurrentPipeline ? mImpl->mCurrentPipeline->GetCreateInfo().colorBlendState : nullptr;
 451   const auto& newBlendState     = mImpl->mNewPipeline->GetCreateInfo().colorBlendState;
 452
 453   // TODO: prevent leaking the state
 454   if(!newBlendState)
 455   {
 456     return;
 457   }
 458
 459   auto& gl = *mImpl->mController.GetGL();
 460
 461   if(!currentBlendState || currentBlendState->blendEnable != newBlendState->blendEnable)
 462   {
 463     if(newBlendState->blendEnable != mImpl->mGlStateCache.mBlendEnabled)
 464     {
 465       mImpl->mGlStateCache.mBlendEnabled = newBlendState->blendEnable;
 466       newBlendState->blendEnable ? gl.Enable(GL_BLEND) : gl.Disable(GL_BLEND);
 467     }
 468   }
 469
 470   if(!newBlendState->blendEnable)
 471   {
 472     return;
 473   }
 474
 475   BlendFactor newSrcRGB(newBlendState->srcColorBlendFactor);
 476   BlendFactor newDstRGB(newBlendState->dstColorBlendFactor);
 477   BlendFactor newSrcAlpha(newBlendState->srcAlphaBlendFactor);
 478   BlendFactor newDstAlpha(newBlendState->dstAlphaBlendFactor);
 479
 480   if(!currentBlendState ||
 481      currentBlendState->srcColorBlendFactor != newSrcRGB ||
 482      currentBlendState->dstColorBlendFactor != newDstRGB ||
 483      currentBlendState->srcAlphaBlendFactor != newSrcAlpha ||
 484      currentBlendState->dstAlphaBlendFactor != newDstAlpha)
 485   {
 486     if((mImpl->mGlStateCache.mBlendFuncSeparateSrcRGB != newSrcRGB) ||
 487        (mImpl->mGlStateCache.mBlendFuncSeparateDstRGB != newDstRGB) ||
 488        (mImpl->mGlStateCache.mBlendFuncSeparateSrcAlpha != newSrcAlpha) ||
 489        (mImpl->mGlStateCache.mBlendFuncSeparateDstAlpha != newDstAlpha))
 490     {
 491       mImpl->mGlStateCache.mBlendFuncSeparateSrcRGB   = newSrcRGB;
 492       mImpl->mGlStateCache.mBlendFuncSeparateDstRGB   = newDstRGB;
 493       mImpl->mGlStateCache.mBlendFuncSeparateSrcAlpha = newSrcAlpha;
 494       mImpl->mGlStateCache.mBlendFuncSeparateDstAlpha = newDstAlpha;
 495
 496       if(newSrcRGB == newSrcAlpha && newDstRGB == newDstAlpha)
 497       {
 498         gl.BlendFunc(GLBlendFunc(newSrcRGB), GLBlendFunc(newDstRGB));
 499       }
 500       else
 501       {
 502         gl.BlendFuncSeparate(GLBlendFunc(newSrcRGB), GLBlendFunc(newDstRGB), GLBlendFunc(newSrcAlpha), GLBlendFunc(newDstAlpha));
 503       }
 504     }
 505   }
 506
 507   if(!currentBlendState ||
 508      currentBlendState->colorBlendOp != newBlendState->colorBlendOp ||
 509      currentBlendState->alphaBlendOp != newBlendState->alphaBlendOp)
 510   {
 511     if(mImpl->mGlStateCache.mBlendEquationSeparateModeRGB != newBlendState->colorBlendOp ||
 512        mImpl->mGlStateCache.mBlendEquationSeparateModeAlpha != newBlendState->alphaBlendOp)
 513     {
 514       mImpl->mGlStateCache.mBlendEquationSeparateModeRGB   = newBlendState->colorBlendOp;
 515       mImpl->mGlStateCache.mBlendEquationSeparateModeAlpha = newBlendState->alphaBlendOp;
 516
 517       if(newBlendState->colorBlendOp == newBlendState->alphaBlendOp)
 518       {
 519         gl.BlendEquation(GLBlendOp(newBlendState->colorBlendOp));
 520       }
 521       else
 522       {
 523         gl.BlendEquationSeparate(GLBlendOp(newBlendState->colorBlendOp), GLBlendOp(newBlendState->alphaBlendOp));
 524       }
 525     }
 526   }
 527 }
 528
 529 void Context::ResolveRasterizationState()
 530 {
 531   const auto& currentRasterizationState = mImpl->mCurrentPipeline ? mImpl->mCurrentPipeline->GetCreateInfo().rasterizationState : nullptr;
 532   const auto& newRasterizationState     = mImpl->mNewPipeline->GetCreateInfo().rasterizationState;
 533
 534   // TODO: prevent leaking the state
 535   if(!newRasterizationState)
 536   {
 537     return;
 538   }
 539
 540   auto& gl = *mImpl->mController.GetGL();
 541
 542   if(!currentRasterizationState ||
 543      currentRasterizationState->cullMode != newRasterizationState->cullMode)
 544   {
 545     if(mImpl->mGlStateCache.mCullFaceMode != newRasterizationState->cullMode)
 546     {
 547       mImpl->mGlStateCache.mCullFaceMode = newRasterizationState->cullMode;
 548       if(newRasterizationState->cullMode == CullMode::NONE)
 549       {
 550         gl.Disable(GL_CULL_FACE);
 551       }
 552       else
 553       {
 554         gl.Enable(GL_CULL_FACE);
 555         gl.CullFace(GLCullMode(newRasterizationState->cullMode));
 556       }
 557     }
 558   }
 559   // TODO: implement polygon mode (fill, line, points)
 560   //       seems like we don't support it (no glPolygonMode())
 561 }
 562
 563 void Context::ResolveUniformBuffers()
 564 {
 565   // Resolve standalone uniforms if we have binding
 566   if(mImpl->mCurrentStandaloneUBOBinding.buffer)
 567   {
 568     ResolveStandaloneUniforms();
 569   }
 570 }
 571
 572 void Context::ResolveStandaloneUniforms()
 573 {
 574   // Find reflection for program
 575   const auto program = static_cast<const GLES::Program*>(mImpl->mNewPipeline->GetCreateInfo().programState->program);
 576   const auto ptr     = reinterpret_cast<const char*>(mImpl->mCurrentStandaloneUBOBinding.buffer->GetCPUAllocatedAddress()) + mImpl->mCurrentStandaloneUBOBinding.offset;
 577
 578   // Update program uniforms
 579   program->GetImplementation()->UpdateStandaloneUniformBlock(ptr);
 580 }
 581
 582 void Context::BeginRenderPass(const BeginRenderPassDescriptor& renderPassBegin)
 583 {
 584   auto& renderPass   = *renderPassBegin.renderPass;
 585   auto& renderTarget = *renderPassBegin.renderTarget;
 586
 587   const auto& targetInfo = renderTarget.GetCreateInfo();
 588
 589   auto& gl = *mImpl->mController.GetGL();
 590
 591   if(targetInfo.surface)
 592   {
 593     // Bind surface FB
 594     BindFrameBuffer(GL_FRAMEBUFFER, 0);
 595   }
 596   else if(targetInfo.framebuffer)
 597   {
 598     // bind framebuffer and swap.
 599     renderTarget.GetFramebuffer()->Bind();
 600   }
 601
 602   // clear (ideally cache the setup)
 603
 604   // In GL we assume that the last attachment is depth/stencil (we may need
 605   // to cache extra information inside GLES RenderTarget if we want to be
 606   // more specific in case of MRT)
 607
 608   const auto& attachments = *renderPass.GetCreateInfo().attachments;
 609   const auto& color0      = attachments[0];
 610   GLuint      mask        = 0;
 611   if(color0.loadOp == AttachmentLoadOp::CLEAR)
 612   {
 613     mask |= GL_COLOR_BUFFER_BIT;
 614
 615     // Set clear color
 616     // Something goes wrong here if Alpha mask is GL_TRUE
 617     ColorMask(true);
 618
 619     const auto clearValues = renderPassBegin.clearValues.Ptr();
 620
 621     if(!mImpl->mGlStateCache.mClearColorSet ||
 622        mImpl->mGlStateCache.mClearColor.r != clearValues[0].color.r ||
 623        mImpl->mGlStateCache.mClearColor.g != clearValues[0].color.g ||
 624        mImpl->mGlStateCache.mClearColor.b != clearValues[0].color.b ||
 625        mImpl->mGlStateCache.mClearColor.a != clearValues[0].color.a)
 626     {
 627       gl.ClearColor(clearValues[0].color.r,
 628                     clearValues[0].color.g,
 629                     clearValues[0].color.b,
 630                     clearValues[0].color.a);
 631
 632       mImpl->mGlStateCache.mClearColorSet = true;
 633       mImpl->mGlStateCache.mClearColor    = Vector4(clearValues[0].color.r,
 634                                                  clearValues[0].color.g,
 635                                                  clearValues[0].color.b,
 636                                                  clearValues[0].color.a);
 637     }
 638   }
 639
 640   // check for depth stencil
 641   if(attachments.size() > 1)
 642   {
 643     const auto& depthStencil = attachments.back();
 644     if(depthStencil.loadOp == AttachmentLoadOp::CLEAR)
 645     {
 646       if(!mImpl->mGlStateCache.mDepthMaskEnabled)
 647       {
 648         mImpl->mGlStateCache.mDepthMaskEnabled = true;
 649         gl.DepthMask(true);
 650       }
 651       mask |= GL_DEPTH_BUFFER_BIT;
 652     }
 653     if(depthStencil.stencilLoadOp == AttachmentLoadOp::CLEAR)
 654     {
 655       if(mImpl->mGlStateCache.mStencilMask != 0xFF)
 656       {
 657         mImpl->mGlStateCache.mStencilMask = 0xFF;
 658         gl.StencilMask(0xFF);
 659       }
 660       mask |= GL_STENCIL_BUFFER_BIT;
 661     }
 662   }
 663
 664   SetScissorTestEnabled(true);
 665   gl.Scissor(renderPassBegin.renderArea.x, renderPassBegin.renderArea.y, renderPassBegin.renderArea.width, renderPassBegin.renderArea.height);
 666   ClearBuffer(mask, true);
 667   SetScissorTestEnabled(false);
 668
 669   mImpl->mCurrentRenderPass   = &renderPass;
 670   mImpl->mCurrentRenderTarget = &renderTarget;
 671 }
 672
 673 void Context::EndRenderPass()
 674 {
 675   if(mImpl->mCurrentRenderTarget)
 676   {
 677     if(mImpl->mCurrentRenderTarget->GetFramebuffer())
 678     {
 679       auto& gl = *mImpl->mController.GetGL();
 680       gl.Flush();
 681     }
 682   }
 683 }
 684
 685 void Context::ClearState()
 686 {
 687   mImpl->mCurrentTextureBindings.clear();
 688 }
 689
 690 void Context::ColorMask(bool enabled)
 691 {
 692   if(enabled != mImpl->mGlStateCache.mColorMask)
 693   {
 694     mImpl->mGlStateCache.mColorMask = enabled;
 695
 696     auto& gl = *mImpl->mController.GetGL();
 697     gl.ColorMask(enabled, enabled, enabled, enabled);
 698   }
 699 }
 700
 701 void Context::ClearStencilBuffer()
 702 {
 703   ClearBuffer(GL_STENCIL_BUFFER_BIT, false);
 704 }
 705
 706 void Context::ClearDepthBuffer()
 707 {
 708   ClearBuffer(GL_DEPTH_BUFFER_BIT, false);
 709 }
 710
 711 void Context::ClearBuffer(uint32_t mask, bool forceClear)
 712 {
 713   mask = mImpl->mGlStateCache.mFrameBufferStateCache.GetClearMask(mask, forceClear, mImpl->mGlStateCache.mScissorTestEnabled);
 714   if(mask > 0)
 715   {
 716     auto& gl = *mImpl->mController.GetGL();
 717     gl.Clear(mask);
 718   }
 719 }
 720
 721 void Context::InvalidateDepthStencilBuffers()
 722 {
 723   auto& gl = *mImpl->mController.GetGL();
 724
 725   GLenum attachments[] = {GL_DEPTH, GL_STENCIL};
 726   gl.InvalidateFramebuffer(GL_FRAMEBUFFER, 2, attachments);
 727 }
 728
 729 void Context::SetScissorTestEnabled(bool scissorEnabled)
 730 {
 731   if(mImpl->mGlStateCache.mScissorTestEnabled != scissorEnabled)
 732   {
 733     mImpl->mGlStateCache.mScissorTestEnabled = scissorEnabled;
 734
 735     auto& gl = *mImpl->mController.GetGL();
 736     if(scissorEnabled)
 737     {
 738       gl.Enable(GL_SCISSOR_TEST);
 739     }
 740     else
 741     {
 742       gl.Disable(GL_SCISSOR_TEST);
 743     }
 744   }
 745 }
 746
 747 void Context::SetStencilTestEnable(bool stencilEnable)
 748 {
 749   if(stencilEnable != mImpl->mGlStateCache.mStencilBufferEnabled)
 750   {
 751     mImpl->mGlStateCache.mStencilBufferEnabled = stencilEnable;
 752
 753     auto& gl = *mImpl->mController.GetGL();
 754     if(stencilEnable)
 755     {
 756       gl.Enable(GL_STENCIL_TEST);
 757     }
 758     else
 759     {
 760       gl.Disable(GL_STENCIL_TEST);
 761     }
 762   }
 763 }
 764
 765 void Context::StencilMask(uint32_t writeMask)
 766 {
 767   if(writeMask != mImpl->mGlStateCache.mStencilMask)
 768   {
 769     mImpl->mGlStateCache.mStencilMask = writeMask;
 770
 771     auto& gl = *mImpl->mController.GetGL();
 772     gl.StencilMask(writeMask);
 773   }
 774 }
 775
 776 void Context::StencilFunc(Graphics::CompareOp compareOp,
 777                           uint32_t            reference,
 778                           uint32_t            compareMask)
 779 {
 780   if(compareOp != mImpl->mGlStateCache.mStencilFunc ||
 781      reference != mImpl->mGlStateCache.mStencilFuncRef ||
 782      compareMask != mImpl->mGlStateCache.mStencilFuncMask)
 783   {
 784     mImpl->mGlStateCache.mStencilFunc     = compareOp;
 785     mImpl->mGlStateCache.mStencilFuncRef  = reference;
 786     mImpl->mGlStateCache.mStencilFuncMask = compareMask;
 787
 788     auto& gl = *mImpl->mController.GetGL();
 789     gl.StencilFunc(GLCompareOp(compareOp).op, reference, compareMask);
 790   }
 791 }
 792
 793 void Context::StencilOp(Graphics::StencilOp failOp,
 794                         Graphics::StencilOp depthFailOp,
 795                         Graphics::StencilOp passOp)
 796 {
 797   if(failOp != mImpl->mGlStateCache.mStencilOpFail ||
 798      depthFailOp != mImpl->mGlStateCache.mStencilOpDepthFail ||
 799      passOp != mImpl->mGlStateCache.mStencilOpDepthPass)
 800   {
 801     mImpl->mGlStateCache.mStencilOpFail      = failOp;
 802     mImpl->mGlStateCache.mStencilOpDepthFail = depthFailOp;
 803     mImpl->mGlStateCache.mStencilOpDepthPass = passOp;
 804
 805     auto& gl = *mImpl->mController.GetGL();
 806     gl.StencilOp(GLStencilOp(failOp).op, GLStencilOp(depthFailOp).op, GLStencilOp(passOp).op);
 807   }
 808 }
 809
 810 void Context::SetDepthCompareOp(Graphics::CompareOp compareOp)
 811 {
 812   if(compareOp != mImpl->mGlStateCache.mDepthFunction)
 813   {
 814     mImpl->mGlStateCache.mDepthFunction = compareOp;
 815     auto& gl                            = *mImpl->mController.GetGL();
 816     gl.DepthFunc(GLCompareOp(compareOp).op);
 817   }
 818 }
 819
 820 void Context::SetDepthTestEnable(bool depthTestEnable)
 821 {
 822   if(depthTestEnable != mImpl->mGlStateCache.mDepthBufferEnabled)
 823   {
 824     mImpl->mGlStateCache.mDepthBufferEnabled = depthTestEnable;
 825
 826     auto& gl = *mImpl->mController.GetGL();
 827     if(depthTestEnable)
 828     {
 829       gl.Enable(GL_DEPTH_TEST);
 830     }
 831     else
 832     {
 833       gl.Disable(GL_DEPTH_TEST);
 834     }
 835   }
 836 }
 837
 838 void Context::SetDepthWriteEnable(bool depthWriteEnable)
 839 {
 840   if(depthWriteEnable != mImpl->mGlStateCache.mDepthMaskEnabled)
 841   {
 842     mImpl->mGlStateCache.mDepthMaskEnabled = depthWriteEnable;
 843
 844     auto& gl = *mImpl->mController.GetGL();
 845     gl.DepthMask(depthWriteEnable);
 846   }
 847 }
 848
 849 void Context::ActiveTexture(uint32_t textureBindingIndex)
 850 {
 851   if(mImpl->mGlStateCache.mActiveTextureUnit != textureBindingIndex)
 852   {
 853     mImpl->mGlStateCache.mActiveTextureUnit = textureBindingIndex;
 854
 855     auto& gl = *mImpl->mController.GetGL();
 856     gl.ActiveTexture(GL_TEXTURE0 + textureBindingIndex);
 857   }
 858 }
 859
 860 void Context::BindTexture(GLenum target, BoundTextureType textureTypeId, uint32_t textureId)
 861 {
 862   uint32_t typeId = static_cast<uint32_t>(textureTypeId);
 863   if(mImpl->mGlStateCache.mBoundTextureId[mImpl->mGlStateCache.mActiveTextureUnit][typeId] != textureId)
 864   {
 865     mImpl->mGlStateCache.mBoundTextureId[mImpl->mGlStateCache.mActiveTextureUnit][typeId] = textureId;
 866
 867     auto& gl = *mImpl->mController.GetGL();
 868     gl.BindTexture(target, textureId);
 869   }
 870 }
 871
 872 void Context::GenerateMipmap(GLenum target)
 873 {
 874   auto& gl = *mImpl->mController.GetGL();
 875   gl.GenerateMipmap(target);
 876 }
 877
 878 void Context::BindBuffer(GLenum target, uint32_t bufferId)
 879 {
 880   if(mImpl->mGlStateCache.mBoundArrayBufferId != bufferId)
 881   {
 882     mImpl->mGlStateCache.mBoundArrayBufferId = bufferId;
 883
 884     auto& gl = *mImpl->mController.GetGL();
 885     gl.BindBuffer(target, bufferId);
 886   }
 887 }
 888
 889 void Context::DrawBuffers(uint32_t count, const GLenum* buffers)
 890 {
 891   mImpl->mGlStateCache.mFrameBufferStateCache.DrawOperation(mImpl->mGlStateCache.mColorMask,
 892                                                             mImpl->mGlStateCache.DepthBufferWriteEnabled(),
 893                                                             mImpl->mGlStateCache.StencilBufferWriteEnabled());
 894
 895   auto& gl = *mImpl->mController.GetGL();
 896   gl.DrawBuffers(count, buffers);
 897 }
 898
 899 void Context::BindFrameBuffer(GLenum target, uint32_t bufferId)
 900 {
 901   mImpl->mGlStateCache.mFrameBufferStateCache.SetCurrentFrameBuffer(bufferId);
 902
 903   auto& gl = *mImpl->mController.GetGL();
 904   gl.BindFramebuffer(target, bufferId);
 905 }
 906
 907 void Context::GenFramebuffers(uint32_t count, uint32_t* framebuffers)
 908 {
 909   auto& gl = *mImpl->mController.GetGL();
 910   gl.GenFramebuffers(count, framebuffers);
 911
 912   mImpl->mGlStateCache.mFrameBufferStateCache.FrameBuffersCreated(count, framebuffers);
 913 }
 914
 915 void Context::DeleteFramebuffers(uint32_t count, uint32_t* framebuffers)
 916 {
 917   mImpl->mGlStateCache.mFrameBufferStateCache.FrameBuffersDeleted(count, framebuffers);
 918
 919   auto& gl = *mImpl->mController.GetGL();
 920   gl.DeleteFramebuffers(count, framebuffers);
 921 }
 922
 923 GLStateCache& Context::GetGLStateCache()
 924 {
 925   return mImpl->mGlStateCache;
 926 }
 927
 928 void Context::GlContextCreated()
 929 {
 930   if(!mImpl->mGlContextCreated)
 931   {
 932     mImpl->mGlContextCreated = true;
 933
 934     // Set the initial GL state
 935     mImpl->InitializeGlState();
 936   }
 937 }
 938
 939 void Context::GlContextDestroyed()
 940 {
 941   mImpl->mGlContextCreated = false;
 942 }
 943
 944 void Context::InvalidateCachedPipeline(GLES::Pipeline* pipeline)
 945 {
 946   // Since the pipeline is deleted, invalidate the cached pipeline.
 947   if(mImpl->mCurrentPipeline == &pipeline->GetPipeline())
 948   {
 949     mImpl->mCurrentPipeline = nullptr;
 950   }
 951 }
 952
 953 } // namespace Dali::Graphics::GLES