text: //
  // Copyright (c) 2008-2017 the Urho3D project.
  //
  // Permission is hereby granted, free of charge, to any person obtaining a copy
  // of this software and associated documentation files (the "Software"), to deal
  // in the Software without restriction, including without limitation the rights
  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  // copies of the Software, and to permit persons to whom the Software is
  // furnished to do so, subject to the following conditions:
  //
  // The above copyright notice and this permission notice shall be included in
  // all copies or substantial portions of the Software.
  //
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  // THE SOFTWARE.
  //
  
  #include "../../Precompiled.h"
  
  #include "../../Graphics/Graphics.h"
  #include "../../Graphics/GraphicsImpl.h"
  #include "../../Graphics/ConstantBuffer.h"
  #include "../../IO/Log.h"
  
  #include "../../DebugNew.h"
  
  namespace Atomic
  {
  
  void ConstantBuffer::Release()
  {
      if (object_.name_)
      {
          if (!graphics_)
              return;
  
  #ifndef GL_ES_VERSION_2_0
          graphics_->SetUBO(0);
          glDeleteBuffers(1, &object_.name_);
  #endif
          object_.name_ = 0;
      }
  
      shadowData_.Reset();
      size_ = 0;
  }
  
  void ConstantBuffer::OnDeviceReset()
  {
      if (size_)
          SetSize(size_); // Recreate
  }
  
  bool ConstantBuffer::SetSize(unsigned size)
  {
      if (!size)
      {
          ATOMIC_LOGERROR("Can not create zero-sized constant buffer");
          return false;
      }
  
      // Round up to next 16 bytes
      size += 15;
      size &= 0xfffffff0;
  
      size_ = size;
      dirty_ = false;
      shadowData_ = new unsigned char[size_];
      memset(shadowData_.Get(), 0, size_);
  
      if (graphics_)
      {
  #ifndef GL_ES_VERSION_2_0
          if (!object_.name_)
              glGenBuffers(1, &object_.name_);
          graphics_->SetUBO(object_.name_);
          glBufferData(GL_UNIFORM_BUFFER, size_, shadowData_.Get(), GL_DYNAMIC_DRAW);
  #endif
      }
  
      return true;
  }
  
  void ConstantBuffer::Apply()
  {
      if (dirty_ && object_.name_)
      {
  #ifndef GL_ES_VERSION_2_0
          graphics_->SetUBO(object_.name_);
          glBufferData(GL_UNIFORM_BUFFER, size_, shadowData_.Get(), GL_DYNAMIC_DRAW);
  #endif
          dirty_ = false;
      }
  }
  
  }
  