text: /****************************************************************************
   Copyright (c) 2015-2016 Chukong Technologies Inc.
   Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.
  
   http://www.cocos2d-x.org
  
   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 "extensions/Particle3D/CCParticleSystem3D.h"
  #include <stddef.h>  // offsetof
  #include "base/ccTypes.h"
  #include "extensions/Particle3D/CCParticle3DRender.h"
  #include "renderer/CCMeshCommand.h"
  #include "renderer/CCRenderer.h"
  #include "renderer/CCTextureCache.h"
  #include "renderer/backend/ProgramState.h"
  #include "renderer/backend/Buffer.h"
  #include "renderer/backend/Device.h"
  #include "renderer/ccShaders.h"
  #include "base/CCDirector.h"
  #include "3d/CCSprite3D.h"
  #include "2d/CCCamera.h"
  
  NS_CC_BEGIN
  
  Particle3DQuadRender::Particle3DQuadRender()
      : _texture(nullptr), _programState(nullptr), _indexBuffer(nullptr), _vertexBuffer(nullptr), _texFile("")
  {}
  
  Particle3DQuadRender::~Particle3DQuadRender()
  {
      // CC_SAFE_RELEASE(_texture);
      CC_SAFE_RELEASE(_programState);
      CC_SAFE_RELEASE(_vertexBuffer);
      CC_SAFE_RELEASE(_indexBuffer);
  }
  
  Particle3DQuadRender* Particle3DQuadRender::create(std::string_view texFile)
  {
      auto ret = new Particle3DQuadRender();
      if (ret->initQuadRender(texFile))
      {
          ret->_texFile = texFile;
          ret->autorelease();
      }
      else
      {
          CC_SAFE_DELETE(ret);
      }
  
      return ret;
  }
  
  void Particle3DQuadRender::render(Renderer* renderer, const Mat4& transform, ParticleSystem3D* particleSystem)
  {
      // batch and generate draw
      const ParticlePool& particlePool = particleSystem->getParticlePool();
      if (!_isVisible || particlePool.empty())
          return;
  
      if (_vertexBuffer == nullptr)
      {
          size_t stride = sizeof(Particle3DQuadRender::posuvcolor);
          _vertexBuffer =
              backend::Device::getInstance()->newBuffer(stride * 4 * particleSystem->getParticleQuota(),
                                                        backend::BufferType::VERTEX, backend::BufferUsage::DYNAMIC);
          if (_vertexBuffer == nullptr)
          {
              CCLOG("Particle3DQuadRender::render create vertex buffer failed");
              return;
          }
      }
  
      if (_indexBuffer == nullptr)
      {
          _indexBuffer =
              backend::Device::getInstance()->newBuffer(sizeof(uint16_t) * 6 * particleSystem->getParticleQuota(),
                                                        backend::BufferType::INDEX, backend::BufferUsage::DYNAMIC);
          if (_indexBuffer == nullptr)
          {
              CCLOG("Particle3DQuadRender::render create index buffer failed");
              return;
          }
      }
      ParticlePool::PoolList activeParticleList = particlePool.getActiveDataList();
      if (_posuvcolors.size() < activeParticleList.size() * 4)
      {
          _posuvcolors.resize(activeParticleList.size() * 4);
          _indexData.resize(activeParticleList.size() * 6);
      }
  
      auto camera         = Camera::getVisitingCamera();
      auto cameraMat      = camera->getNodeToWorldTransform();
      const Mat4& viewMat = cameraMat.getInversed();
  
      Mat4 pRotMat;
      Vec3 right(cameraMat.m[0], cameraMat.m[1], cameraMat.m[2]);
      Vec3 up(cameraMat.m[4], cameraMat.m[5], cameraMat.m[6]);
      Vec3 backward(cameraMat.m[8], cameraMat.m[9], cameraMat.m[10]);
  
      Vec3 position;  // particle position
      int vertexindex = 0;
      int index       = 0;
      for (auto iter : activeParticleList)
      {
          auto particle   = iter;
          Vec3 halfwidth  = particle->width * 0.5f * right;
          Vec3 halfheight = particle->height * 0.5f * up;
          // transform.transformPoint(particle->position, &position);
          position                           = particle->position;
          _posuvcolors[vertexindex].position = (position + (-halfwidth - halfheight));
          _posuvcolors[vertexindex].color    = particle->color;
          _posuvcolors[vertexindex].uv.set(particle->lb_uv);
  
          _posuvcolors[vertexindex + 1].position = (position + (halfwidth - halfheight));
          _posuvcolors[vertexindex + 1].color    = particle->color;
          _posuvcolors[vertexindex + 1].uv.set(particle->rt_uv.x, particle->lb_uv.y);
  
          _posuvcolors[vertexindex + 2].position = (position + (-halfwidth + halfheight));
          _posuvcolors[vertexindex + 2].color    = particle->color;
          _posuvcolors[vertexindex + 2].uv.set(particle->lb_uv.x, particle->rt_uv.y);
  
          _posuvcolors[vertexindex + 3].position = (position + (halfwidth + halfheight));
          _posuvcolors[vertexindex + 3].color    = particle->color;
          _posuvcolors[vertexindex + 3].uv.set(particle->rt_uv);
  
          _indexData[index]     = vertexindex;
          _indexData[index + 1] = vertexindex + 1;
          _indexData[index + 2] = vertexindex + 3;
          _indexData[index + 3] = vertexindex;
          _indexData[index + 4] = vertexindex + 3;
          _indexData[index + 5] = vertexindex + 2;
  
          index += 6;
          vertexindex += 4;
      }
  
      _posuvcolors.erase(_posuvcolors.begin() + vertexindex, _posuvcolors.end());
      _indexData.erase(_indexData.begin() + index, _indexData.end());
  
      _vertexBuffer->updateData(&_posuvcolors[0], vertexindex * sizeof(_posuvcolors[0]));
      _indexBuffer->updateData(&_indexData[0], index * sizeof(_indexData[0]));
  
      float depthZ = -(viewMat.m[2] * transform.m[12] + viewMat.m[6] * transform.m[13] + viewMat.m[10] * transform.m[14] +
                       viewMat.m[14]);
  
      _beforeCommand.init(depthZ);
      _meshCommand.init(depthZ);
      _afterCommand.init(depthZ);
  
      _meshCommand.setVertexBuffer(_vertexBuffer);
      _meshCommand.setIndexBuffer(_indexBuffer, MeshCommand::IndexFormat::U_SHORT);
  
      auto& projectionMatrix = Director::getInstance()->getMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_PROJECTION);
      _programState->setUniform(_locPMatrix, &projectionMatrix.m, sizeof(projectionMatrix.m));
  
      if (_texture)
      {
          _programState->setTexture(_locTexture, 0, _texture->getBackendTexture());
      }
      _stateBlock.setBlendFunc(particleSystem->getBlendFunc());
      auto uColor = Vec4(1, 1, 1, 1);
      _programState->setUniform(_locColor, &uColor, sizeof(uColor));
  
      _meshCommand.setIndexDrawInfo(0, index);
  
      renderer->addCommand(&_beforeCommand);
      renderer->addCommand(&_meshCommand);
      renderer->addCommand(&_afterCommand);
  }
  
  bool Particle3DQuadRender::initQuadRender(std::string_view texFile)
  {
      CC_SAFE_RELEASE_NULL(_programState);
  
      if (!texFile.empty())
      {
          auto tex = Director::getInstance()->getTextureCache()->addImage(texFile);
          if (tex)
          {
              _texture      = tex;
              auto* program = backend::Program::getBuiltinProgram(backend::ProgramType::PARTICLE_TEXTURE_3D);
              _programState = new backend::ProgramState(program);
          }
      }
  
      if (!_programState)
      {
          auto* program = backend::Program::getBuiltinProgram(backend::ProgramType::PARTICLE_COLOR_3D);
          _programState = new backend::ProgramState(program);
      }
  
      auto& pipelineDescriptor        = _meshCommand.getPipelineDescriptor();
      pipelineDescriptor.programState = _programState;
      auto layout                     = _programState->getVertexLayout();
      const auto& attributeInfo       = _programState->getProgram()->getActiveAttributes();
      auto iter                       = attributeInfo.find("a_position");
      if (iter != attributeInfo.end())
      {
          layout->setAttribute("a_position", iter->second.location, backend::VertexFormat::FLOAT3,
                               offsetof(posuvcolor, position), false);
      }
      iter = attributeInfo.find("a_texCoord");
      if (iter != attributeInfo.end())
      {
          layout->setAttribute("a_texCoord", iter->second.location, backend::VertexFormat::FLOAT2,
                               offsetof(posuvcolor, uv), false);
      }
      iter = attributeInfo.find("a_color");
      if (iter != attributeInfo.end())
      {
          layout->setAttribute("a_color", iter->second.location, backend::VertexFormat::FLOAT4,
                               offsetof(posuvcolor, color), false);
      }
      layout->setLayout(sizeof(posuvcolor));
  
      _locColor   = _programState->getUniformLocation("u_color");
      _locPMatrix = _programState->getUniformLocation("u_PMatrix");
      _locTexture = _programState->getUniformLocation("u_texture");
  
      _meshCommand.setTransparent(true);
      _meshCommand.setSkipBatching(true);
  
      _stateBlock.setDepthTest(true);
      _stateBlock.setDepthWrite(false);
      _stateBlock.setCullFaceSide(backend::CullMode::BACK);
      _stateBlock.setCullFace(true);
  
      _beforeCommand.func = CC_CALLBACK_0(Particle3DQuadRender::onBeforeDraw, this);
      _afterCommand.func  = CC_CALLBACK_0(Particle3DQuadRender::onAfterDraw, this);
      return true;
  }
  
  void Particle3DQuadRender::onBeforeDraw()
  {
      auto* renderer            = Director::getInstance()->getRenderer();
      auto& pipelineDescriptor  = _meshCommand.getPipelineDescriptor();
      _rendererDepthTestEnabled = renderer->getDepthTest();
      _rendererDepthCmpFunc     = renderer->getDepthCompareFunction();
      _rendererCullMode         = renderer->getCullMode();
      _rendererDepthWrite       = renderer->getDepthWrite();
      _rendererWinding          = renderer->getWinding();
      _stateBlock.bind(&pipelineDescriptor);
      renderer->setDepthTest(true);
  }
  
  void Particle3DQuadRender::onAfterDraw()
  {
      auto* renderer = Director::getInstance()->getRenderer();
      renderer->setDepthTest(_rendererDepthTestEnabled);
      renderer->setDepthCompareFunction(_rendererDepthCmpFunc);
      renderer->setCullMode(_rendererCullMode);
      renderer->setDepthWrite(_rendererDepthWrite);
      renderer->setWinding(_rendererWinding);
  }
  
  void Particle3DQuadRender::reset()
  {
      this->initQuadRender(_texFile);
  }
  
  //////////////////////////////////////////////////////////////////////////////
  Particle3DModelRender::Particle3DModelRender() : _spriteSize(Vec3::ONE) {}
  Particle3DModelRender::~Particle3DModelRender()
  {
      for (auto iter : _spriteList)
      {
          iter->release();
      }
  }
  
  Particle3DModelRender* Particle3DModelRender::create(std::string_view modelFile, std::string_view texFile)
  {
      auto ret        = new Particle3DModelRender();
      ret->_modelFile = modelFile;
      ret->_texFile   = texFile;
      return ret;
  }
  
  void Particle3DModelRender::render(Renderer* renderer, const Mat4& transform, ParticleSystem3D* particleSystem)
  {
      if (!_isVisible)
          return;
  
      if (_spriteList.empty())
      {
          for (unsigned int i = 0; i < particleSystem->getParticleQuota(); ++i)
          {
              Sprite3D* sprite = Sprite3D::create(_modelFile);
              if (sprite == nullptr)
              {
                  CCLOG("failed to load file %s", _modelFile.c_str());
                  continue;
              }
              sprite->setTexture(_texFile);
              sprite->retain();
              _spriteList.push_back(sprite);
          }
          if (!_spriteList.empty())
          {
              const AABB& aabb = _spriteList[0]->getAABB();
              Vec3 corners[8];
              aabb.getCorners(corners);
              _spriteSize = corners[3] - corners[6];
          }
      }
  
      const ParticlePool& particlePool          = particleSystem->getParticlePool();
      ParticlePool::PoolList activeParticleList = particlePool.getActiveDataList();
      Mat4 mat;
      Mat4 rotMat;
      Mat4 sclMat;
      Quaternion q;
      transform.decompose(nullptr, &q, nullptr);
      unsigned int index = 0;
      for (auto iter : activeParticleList)
      {
          auto particle = iter;
          Mat4::createRotation(q * particle->orientation, &rotMat);
          sclMat.m[0]  = particle->width / _spriteSize.x;
          sclMat.m[5]  = particle->height / _spriteSize.y;
          sclMat.m[10] = particle->depth / _spriteSize.z;
          mat          = rotMat * sclMat;
          mat.m[12]    = particle->position.x;
          mat.m[13]    = particle->position.y;
          mat.m[14]    = particle->position.z;
          _spriteList[index++]->draw(renderer, mat, 0);
      }
  }
  
  void Particle3DModelRender::reset()
  {
      for (auto iter : _spriteList)
      {
          iter->release();
      }
      _spriteList.clear();
  }
  
  // MARK: Particle3DRender
  
  Particle3DRender::Particle3DRender()
      : _particleSystem(nullptr), _isVisible(true), _rendererScale(Vec3::ONE), _depthTest(true), _depthWrite(false)
  {
      _stateBlock.setCullFace(false);
      _stateBlock.setCullFaceSide(backend::CullMode::BACK);
      _stateBlock.setDepthTest(false);
      _stateBlock.setDepthWrite(false);
      _stateBlock.setBlend(true);
  };
  
  Particle3DRender::~Particle3DRender() {}
  
  void Particle3DRender::copyAttributesTo(Particle3DRender* render)
  {
      render->_stateBlock    = _stateBlock;
      render->_isVisible     = _isVisible;
      render->_rendererScale = _rendererScale;
      render->_depthTest     = _depthTest;
      render->_depthWrite    = _depthWrite;
  }
  
  void Particle3DRender::notifyStart()
  {
      setVisible(true);
  }
  
  void Particle3DRender::notifyStop()
  {
      setVisible(false);
  }
  
  void Particle3DRender::notifyRescaled(const Vec3& scale)
  {
      _rendererScale = scale;
  }
  
  void Particle3DRender::setDepthTest(bool isDepthTest)
  {
      _depthTest = isDepthTest;
      _stateBlock.setDepthTest(_depthTest);
  }
  
  void Particle3DRender::setDepthWrite(bool isDepthWrite)
  {
      _depthWrite = isDepthWrite;
      _stateBlock.setDepthWrite(_depthWrite);
  }
  
  void Particle3DRender::setBlendFunc(const BlendFunc& blendFunc)
  {
      _stateBlock.setBlendFunc(blendFunc);
  }
  
  NS_CC_END
  