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