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 Graphics::TextureBinding* bindings, uint32_t count)
 326 {
 327   // for each texture allocate slot
 328   for(auto i = 0u; i < count; ++i)
 329   {
 330     auto& binding = bindings[i];
 331
 332     // Resize binding array if needed
 333     if(mImpl->mCurrentTextureBindings.size() <= binding.binding)
 334     {
 335       mImpl->mCurrentTextureBindings.resize(binding.binding + 1);
 336     }
 337     // Store the binding details
 338     mImpl->mCurrentTextureBindings[binding.binding] = binding;
 339   }
 340 }
 341
 342 void Context::BindVertexBuffers(const GLES::VertexBufferBindingDescriptor* bindings, uint32_t count)
 343 {
 344   if(count > mImpl->mCurrentVertexBufferBindings.size())
 345   {
 346     mImpl->mCurrentVertexBufferBindings.resize(count);
 347   }
 348   // Copy only set slots
 349   std::copy_if(bindings, bindings + count, mImpl->mCurrentVertexBufferBindings.begin(), [](auto& item) {
 350     return (nullptr != item.buffer);
 351   });
 352 }
 353
 354 void Context::BindIndexBuffer(const IndexBufferBindingDescriptor& indexBufferBinding)
 355 {
 356   mImpl->mCurrentIndexBufferBinding = indexBufferBinding;
 357 }
 358
 359 void Context::BindPipeline(const GLES::Pipeline* newPipeline)
 360 {
 361   DALI_ASSERT_ALWAYS(newPipeline && "Invalid pipeline");
 362   mImpl->mNewPipeline = &newPipeline->GetPipeline();
 363 }
 364
 365 void Context::BindUniformBuffers(const UniformBufferBindingDescriptor* uboBindings,
 366                                  uint32_t                              uboCount,
 367                                  const UniformBufferBindingDescriptor& standaloneBindings)
 368 {
 369   if(standaloneBindings.buffer)
 370   {
 371     mImpl->mCurrentStandaloneUBOBinding = standaloneBindings;
 372   }
 373
 374   if(uboCount >= mImpl->mCurrentUBOBindings.size())
 375   {
 376     mImpl->mCurrentUBOBindings.resize(uboCount + 1);
 377   }
 378
 379   auto it = uboBindings;
 380   for(auto i = 0u; i < uboCount; ++i)
 381   {
 382     if(it->buffer)
 383     {
 384       mImpl->mCurrentUBOBindings[i] = *it;
 385     }
 386   }
 387 }
 388
 389 void Context::ResolveBlendState()
 390 {
 391   const auto& currentBlendState = mImpl->mCurrentPipeline ? mImpl->mCurrentPipeline->GetCreateInfo().colorBlendState : nullptr;
 392   const auto& newBlendState     = mImpl->mNewPipeline->GetCreateInfo().colorBlendState;
 393
 394   // TODO: prevent leaking the state
 395   if(!newBlendState)
 396   {
 397     return;
 398   }
 399
 400   auto& gl = *mImpl->mController.GetGL();
 401
 402   if(!currentBlendState || currentBlendState->blendEnable != newBlendState->blendEnable)
 403   {
 404     if(newBlendState->blendEnable != mImpl->mGlStateCache.mBlendEnabled)
 405     {
 406       mImpl->mGlStateCache.mBlendEnabled = newBlendState->blendEnable;
 407       newBlendState->blendEnable ? gl.Enable(GL_BLEND) : gl.Disable(GL_BLEND);
 408     }
 409   }
 410
 411   if(!newBlendState->blendEnable)
 412   {
 413     return;
 414   }
 415
 416   BlendFactor newSrcRGB(newBlendState->srcColorBlendFactor);
 417   BlendFactor newDstRGB(newBlendState->dstColorBlendFactor);
 418   BlendFactor newSrcAlpha(newBlendState->srcAlphaBlendFactor);
 419   BlendFactor newDstAlpha(newBlendState->dstAlphaBlendFactor);
 420
 421   if(!currentBlendState ||
 422      currentBlendState->srcColorBlendFactor != newSrcRGB ||
 423      currentBlendState->dstColorBlendFactor != newDstRGB ||
 424      currentBlendState->srcAlphaBlendFactor != newSrcAlpha ||
 425      currentBlendState->dstAlphaBlendFactor != newDstAlpha)
 426   {
 427     if((mImpl->mGlStateCache.mBlendFuncSeparateSrcRGB != newSrcRGB) ||
 428        (mImpl->mGlStateCache.mBlendFuncSeparateDstRGB != newDstRGB) ||
 429        (mImpl->mGlStateCache.mBlendFuncSeparateSrcAlpha != newSrcAlpha) ||
 430        (mImpl->mGlStateCache.mBlendFuncSeparateDstAlpha != newDstAlpha))
 431     {
 432       mImpl->mGlStateCache.mBlendFuncSeparateSrcRGB   = newSrcRGB;
 433       mImpl->mGlStateCache.mBlendFuncSeparateDstRGB   = newDstRGB;
 434       mImpl->mGlStateCache.mBlendFuncSeparateSrcAlpha = newSrcAlpha;
 435       mImpl->mGlStateCache.mBlendFuncSeparateDstAlpha = newDstAlpha;
 436
 437       if(newSrcRGB == newSrcAlpha && newDstRGB == newDstAlpha)
 438       {
 439         gl.BlendFunc(GLBlendFunc(newSrcRGB), GLBlendFunc(newDstRGB));
 440       }
 441       else
 442       {
 443         gl.BlendFuncSeparate(GLBlendFunc(newSrcRGB), GLBlendFunc(newDstRGB), GLBlendFunc(newSrcAlpha), GLBlendFunc(newDstAlpha));
 444       }
 445     }
 446   }
 447
 448   if(!currentBlendState ||
 449      currentBlendState->colorBlendOp != newBlendState->colorBlendOp ||
 450      currentBlendState->alphaBlendOp != newBlendState->alphaBlendOp)
 451   {
 452     if(mImpl->mGlStateCache.mBlendEquationSeparateModeRGB != newBlendState->colorBlendOp ||
 453        mImpl->mGlStateCache.mBlendEquationSeparateModeAlpha != newBlendState->alphaBlendOp)
 454     {
 455       mImpl->mGlStateCache.mBlendEquationSeparateModeRGB   = newBlendState->colorBlendOp;
 456       mImpl->mGlStateCache.mBlendEquationSeparateModeAlpha = newBlendState->alphaBlendOp;
 457
 458       if(newBlendState->colorBlendOp == newBlendState->alphaBlendOp)
 459       {
 460         gl.BlendEquation(GLBlendOp(newBlendState->colorBlendOp));
 461       }
 462       else
 463       {
 464         gl.BlendEquationSeparate(GLBlendOp(newBlendState->colorBlendOp), GLBlendOp(newBlendState->alphaBlendOp));
 465       }
 466     }
 467   }
 468 }
 469
 470 void Context::ResolveRasterizationState()
 471 {
 472   const auto& currentRasterizationState = mImpl->mCurrentPipeline ? mImpl->mCurrentPipeline->GetCreateInfo().rasterizationState : nullptr;
 473   const auto& newRasterizationState     = mImpl->mNewPipeline->GetCreateInfo().rasterizationState;
 474
 475   // TODO: prevent leaking the state
 476   if(!newRasterizationState)
 477   {
 478     return;
 479   }
 480
 481   auto& gl = *mImpl->mController.GetGL();
 482
 483   if(!currentRasterizationState ||
 484      currentRasterizationState->cullMode != newRasterizationState->cullMode)
 485   {
 486     if(mImpl->mGlStateCache.mCullFaceMode != newRasterizationState->cullMode)
 487     {
 488       mImpl->mGlStateCache.mCullFaceMode = newRasterizationState->cullMode;
 489       if(newRasterizationState->cullMode == CullMode::NONE)
 490       {
 491         gl.Disable(GL_CULL_FACE);
 492       }
 493       else
 494       {
 495         gl.Enable(GL_CULL_FACE);
 496         gl.CullFace(GLCullMode(newRasterizationState->cullMode));
 497       }
 498     }
 499   }
 500   // TODO: implement polygon mode (fill, line, points)
 501   //       seems like we don't support it (no glPolygonMode())
 502 }
 503
 504 void Context::ResolveUniformBuffers()
 505 {
 506   // Resolve standalone uniforms if we have binding
 507   if(mImpl->mCurrentStandaloneUBOBinding.buffer)
 508   {
 509     ResolveStandaloneUniforms();
 510   }
 511 }
 512
 513 void Context::ResolveStandaloneUniforms()
 514 {
 515   // Find reflection for program
 516   const auto program = static_cast<const GLES::Program*>(mImpl->mNewPipeline->GetCreateInfo().programState->program);
 517   const auto ptr     = reinterpret_cast<const char*>(mImpl->mCurrentStandaloneUBOBinding.buffer->GetCPUAllocatedAddress()) + mImpl->mCurrentStandaloneUBOBinding.offset;
 518
 519   // Update program uniforms
 520   program->GetImplementation()->UpdateStandaloneUniformBlock(ptr);
 521 }
 522
 523 void Context::BeginRenderPass(const BeginRenderPassDescriptor& renderPassBegin)
 524 {
 525   auto& renderPass   = *renderPassBegin.renderPass;
 526   auto& renderTarget = *renderPassBegin.renderTarget;
 527
 528   const auto& targetInfo = renderTarget.GetCreateInfo();
 529
 530   auto& gl = *mImpl->mController.GetGL();
 531
 532   if(targetInfo.surface)
 533   {
 534     // Bind surface FB
 535     BindFrameBuffer(GL_FRAMEBUFFER, 0);
 536   }
 537   else if(targetInfo.framebuffer)
 538   {
 539     // bind framebuffer and swap.
 540     renderTarget.GetFramebuffer()->Bind();
 541   }
 542
 543   // clear (ideally cache the setup)
 544
 545   // In GL we assume that the last attachment is depth/stencil (we may need
 546   // to cache extra information inside GLES RenderTarget if we want to be
 547   // more specific in case of MRT)
 548
 549   const auto& attachments = *renderPass.GetCreateInfo().attachments;
 550   const auto& color0      = attachments[0];
 551   GLuint      mask        = 0;
 552   if(color0.loadOp == AttachmentLoadOp::CLEAR)
 553   {
 554     mask |= GL_COLOR_BUFFER_BIT;
 555
 556     // Set clear color
 557     // Something goes wrong here if Alpha mask is GL_TRUE
 558     ColorMask(true);
 559
 560     const auto clearValues = renderPassBegin.clearValues.Ptr();
 561
 562     if(!mImpl->mGlStateCache.mClearColorSet ||
 563        mImpl->mGlStateCache.mClearColor.r != clearValues[0].color.r ||
 564        mImpl->mGlStateCache.mClearColor.g != clearValues[0].color.g ||
 565        mImpl->mGlStateCache.mClearColor.b != clearValues[0].color.b ||
 566        mImpl->mGlStateCache.mClearColor.a != clearValues[0].color.a)
 567     {
 568       gl.ClearColor(clearValues[0].color.r,
 569                     clearValues[0].color.g,
 570                     clearValues[0].color.b,
 571                     clearValues[0].color.a);
 572
 573       mImpl->mGlStateCache.mClearColorSet = true;
 574       mImpl->mGlStateCache.mClearColor    = Vector4(clearValues[0].color.r,
 575                                                  clearValues[0].color.g,
 576                                                  clearValues[0].color.b,
 577                                                  clearValues[0].color.a);
 578     }
 579   }
 580
 581   // check for depth stencil
 582   if(attachments.size() > 1)
 583   {
 584     const auto& depthStencil = attachments.back();
 585     if(depthStencil.loadOp == AttachmentLoadOp::CLEAR)
 586     {
 587       if(!mImpl->mGlStateCache.mDepthMaskEnabled)
 588       {
 589         mImpl->mGlStateCache.mDepthMaskEnabled = true;
 590         gl.DepthMask(true);
 591       }
 592       mask |= GL_DEPTH_BUFFER_BIT;
 593     }
 594     if(depthStencil.stencilLoadOp == AttachmentLoadOp::CLEAR)
 595     {
 596       if(mImpl->mGlStateCache.mStencilMask != 0xFF)
 597       {
 598         mImpl->mGlStateCache.mStencilMask = 0xFF;
 599         gl.StencilMask(0xFF);
 600       }
 601       mask |= GL_STENCIL_BUFFER_BIT;
 602     }
 603   }
 604
 605   SetScissorTestEnabled(true);
 606   gl.Scissor(renderPassBegin.renderArea.x, renderPassBegin.renderArea.y, renderPassBegin.renderArea.width, renderPassBegin.renderArea.height);
 607   ClearBuffer(mask, true);
 608   SetScissorTestEnabled(false);
 609
 610   mImpl->mCurrentRenderPass   = &renderPass;
 611   mImpl->mCurrentRenderTarget = &renderTarget;
 612 }
 613
 614 void Context::EndRenderPass()
 615 {
 616   if(mImpl->mCurrentRenderTarget)
 617   {
 618     if(mImpl->mCurrentRenderTarget->GetFramebuffer())
 619     {
 620       auto& gl = *mImpl->mController.GetGL();
 621       gl.Flush();
 622     }
 623   }
 624 }
 625
 626 void Context::ClearState()
 627 {
 628   mImpl->mCurrentTextureBindings.clear();
 629 }
 630
 631 void Context::ColorMask(bool enabled)
 632 {
 633   if(enabled != mImpl->mGlStateCache.mColorMask)
 634   {
 635     mImpl->mGlStateCache.mColorMask = enabled;
 636
 637     auto& gl = *mImpl->mController.GetGL();
 638     gl.ColorMask(enabled, enabled, enabled, enabled);
 639   }
 640 }
 641
 642 void Context::ClearStencilBuffer()
 643 {
 644   ClearBuffer(GL_STENCIL_BUFFER_BIT, false);
 645 }
 646
 647 void Context::ClearDepthBuffer()
 648 {
 649   ClearBuffer(GL_DEPTH_BUFFER_BIT, false);
 650 }
 651
 652 void Context::ClearBuffer(uint32_t mask, bool forceClear)
 653 {
 654   mask = mImpl->mGlStateCache.mFrameBufferStateCache.GetClearMask(mask, forceClear, mImpl->mGlStateCache.mScissorTestEnabled);
 655   if(mask > 0)
 656   {
 657     auto& gl = *mImpl->mController.GetGL();
 658     gl.Clear(mask);
 659   }
 660 }
 661
 662 void Context::InvalidateDepthStencilBuffers()
 663 {
 664   auto& gl = *mImpl->mController.GetGL();
 665
 666   GLenum attachments[] = {GL_DEPTH, GL_STENCIL};
 667   gl.InvalidateFramebuffer(GL_FRAMEBUFFER, 2, attachments);
 668 }
 669
 670 void Context::SetScissorTestEnabled(bool scissorEnabled)
 671 {
 672   if(mImpl->mGlStateCache.mScissorTestEnabled != scissorEnabled)
 673   {
 674     mImpl->mGlStateCache.mScissorTestEnabled = scissorEnabled;
 675
 676     auto& gl = *mImpl->mController.GetGL();
 677     if(scissorEnabled)
 678     {
 679       gl.Enable(GL_SCISSOR_TEST);
 680     }
 681     else
 682     {
 683       gl.Disable(GL_SCISSOR_TEST);
 684     }
 685   }
 686 }
 687
 688 void Context::SetStencilTestEnable(bool stencilEnable)
 689 {
 690   if(stencilEnable != mImpl->mGlStateCache.mStencilBufferEnabled)
 691   {
 692     mImpl->mGlStateCache.mStencilBufferEnabled = stencilEnable;
 693
 694     auto& gl = *mImpl->mController.GetGL();
 695     if(stencilEnable)
 696     {
 697       gl.Enable(GL_STENCIL_TEST);
 698     }
 699     else
 700     {
 701       gl.Disable(GL_STENCIL_TEST);
 702     }
 703   }
 704 }
 705
 706 void Context::StencilMask(uint32_t writeMask)
 707 {
 708   if(writeMask != mImpl->mGlStateCache.mStencilMask)
 709   {
 710     mImpl->mGlStateCache.mStencilMask = writeMask;
 711
 712     auto& gl = *mImpl->mController.GetGL();
 713     gl.StencilMask(writeMask);
 714   }
 715 }
 716
 717 void Context::StencilFunc(Graphics::CompareOp compareOp,
 718                           uint32_t            reference,
 719                           uint32_t            compareMask)
 720 {
 721   if(compareOp != mImpl->mGlStateCache.mStencilFunc ||
 722      reference != mImpl->mGlStateCache.mStencilFuncRef ||
 723      compareMask != mImpl->mGlStateCache.mStencilFuncMask)
 724   {
 725     mImpl->mGlStateCache.mStencilFunc     = compareOp;
 726     mImpl->mGlStateCache.mStencilFuncRef  = reference;
 727     mImpl->mGlStateCache.mStencilFuncMask = compareMask;
 728
 729     auto& gl = *mImpl->mController.GetGL();
 730     gl.StencilFunc(GLCompareOp(compareOp).op, reference, compareMask);
 731   }
 732 }
 733
 734 void Context::StencilOp(Graphics::StencilOp failOp,
 735                         Graphics::StencilOp depthFailOp,
 736                         Graphics::StencilOp passOp)
 737 {
 738   if(failOp != mImpl->mGlStateCache.mStencilOpFail ||
 739      depthFailOp != mImpl->mGlStateCache.mStencilOpDepthFail ||
 740      passOp != mImpl->mGlStateCache.mStencilOpDepthPass)
 741   {
 742     mImpl->mGlStateCache.mStencilOpFail      = failOp;
 743     mImpl->mGlStateCache.mStencilOpDepthFail = depthFailOp;
 744     mImpl->mGlStateCache.mStencilOpDepthPass = passOp;
 745
 746     auto& gl = *mImpl->mController.GetGL();
 747     gl.StencilOp(GLStencilOp(failOp).op, GLStencilOp(depthFailOp).op, GLStencilOp(passOp).op);
 748   }
 749 }
 750
 751 void Context::SetDepthCompareOp(Graphics::CompareOp compareOp)
 752 {
 753   if(compareOp != mImpl->mGlStateCache.mDepthFunction)
 754   {
 755     mImpl->mGlStateCache.mDepthFunction = compareOp;
 756     auto& gl                            = *mImpl->mController.GetGL();
 757     gl.DepthFunc(GLCompareOp(compareOp).op);
 758   }
 759 }
 760
 761 void Context::SetDepthTestEnable(bool depthTestEnable)
 762 {
 763   if(depthTestEnable != mImpl->mGlStateCache.mDepthBufferEnabled)
 764   {
 765     mImpl->mGlStateCache.mDepthBufferEnabled = depthTestEnable;
 766
 767     auto& gl = *mImpl->mController.GetGL();
 768     if(depthTestEnable)
 769     {
 770       gl.Enable(GL_DEPTH_TEST);
 771     }
 772     else
 773     {
 774       gl.Disable(GL_DEPTH_TEST);
 775     }
 776   }
 777 }
 778
 779 void Context::SetDepthWriteEnable(bool depthWriteEnable)
 780 {
 781   if(depthWriteEnable != mImpl->mGlStateCache.mDepthMaskEnabled)
 782   {
 783     mImpl->mGlStateCache.mDepthMaskEnabled = depthWriteEnable;
 784
 785     auto& gl = *mImpl->mController.GetGL();
 786     gl.DepthMask(depthWriteEnable);
 787   }
 788 }
 789
 790 void Context::ActiveTexture(uint32_t textureBindingIndex)
 791 {
 792   if(mImpl->mGlStateCache.mActiveTextureUnit != textureBindingIndex)
 793   {
 794     mImpl->mGlStateCache.mActiveTextureUnit = textureBindingIndex;
 795
 796     auto& gl = *mImpl->mController.GetGL();
 797     gl.ActiveTexture(GL_TEXTURE0 + textureBindingIndex);
 798   }
 799 }
 800
 801 void Context::BindTexture(GLenum target, BoundTextureType textureTypeId, uint32_t textureId)
 802 {
 803   uint32_t typeId = static_cast<uint32_t>(textureTypeId);
 804   if(mImpl->mGlStateCache.mBoundTextureId[mImpl->mGlStateCache.mActiveTextureUnit][typeId] != textureId)
 805   {
 806     mImpl->mGlStateCache.mBoundTextureId[mImpl->mGlStateCache.mActiveTextureUnit][typeId] = textureId;
 807
 808     auto& gl = *mImpl->mController.GetGL();
 809     gl.BindTexture(target, textureId);
 810   }
 811 }
 812
 813 void Context::GenerateMipmap(GLenum target)
 814 {
 815   auto& gl = *mImpl->mController.GetGL();
 816   gl.GenerateMipmap(target);
 817 }
 818
 819 void Context::BindBuffer(GLenum target, uint32_t bufferId)
 820 {
 821   if(mImpl->mGlStateCache.mBoundArrayBufferId != bufferId)
 822   {
 823     mImpl->mGlStateCache.mBoundArrayBufferId = bufferId;
 824
 825     auto& gl = *mImpl->mController.GetGL();
 826     gl.BindBuffer(target, bufferId);
 827   }
 828 }
 829
 830 void Context::DrawBuffers(uint32_t count, const GLenum* buffers)
 831 {
 832   mImpl->mGlStateCache.mFrameBufferStateCache.DrawOperation(mImpl->mGlStateCache.mColorMask,
 833                                                             mImpl->mGlStateCache.DepthBufferWriteEnabled(),
 834                                                             mImpl->mGlStateCache.StencilBufferWriteEnabled());
 835
 836   auto& gl = *mImpl->mController.GetGL();
 837   gl.DrawBuffers(count, buffers);
 838 }
 839
 840 void Context::BindFrameBuffer(GLenum target, uint32_t bufferId)
 841 {
 842   mImpl->mGlStateCache.mFrameBufferStateCache.SetCurrentFrameBuffer(bufferId);
 843
 844   auto& gl = *mImpl->mController.GetGL();
 845   gl.BindFramebuffer(target, bufferId);
 846 }
 847
 848 void Context::GenFramebuffers(uint32_t count, uint32_t* framebuffers)
 849 {
 850   auto& gl = *mImpl->mController.GetGL();
 851   gl.GenFramebuffers(count, framebuffers);
 852
 853   mImpl->mGlStateCache.mFrameBufferStateCache.FrameBuffersCreated(count, framebuffers);
 854 }
 855
 856 void Context::DeleteFramebuffers(uint32_t count, uint32_t* framebuffers)
 857 {
 858   mImpl->mGlStateCache.mFrameBufferStateCache.FrameBuffersDeleted(count, framebuffers);
 859
 860   auto& gl = *mImpl->mController.GetGL();
 861   gl.DeleteFramebuffers(count, framebuffers);
 862 }
 863
 864 GLStateCache& Context::GetGLStateCache()
 865 {
 866   return mImpl->mGlStateCache;
 867 }
 868
 869 void Context::GlContextCreated()
 870 {
 871   if(!mImpl->mGlContextCreated)
 872   {
 873     mImpl->mGlContextCreated = true;
 874
 875     // Set the initial GL state
 876     mImpl->InitializeGlState();
 877   }
 878 }
 879
 880 void Context::GlContextDestroyed()
 881 {
 882   mImpl->mGlContextCreated = false;
 883 }
 884
 885 void Context::InvalidateCachedPipeline(GLES::Pipeline* pipeline)
 886 {
 887   // Since the pipeline is deleted, invalidate the cached pipeline.
 888   if(mImpl->mCurrentPipeline == &pipeline->GetPipeline())
 889   {
 890     mImpl->mCurrentPipeline = nullptr;
 891   }
 892 }
 893
 894 } // namespace Dali::Graphics::GLES