Method Draw

libs/drape_frontend/circles_pack_shape.cpp:144–181

}

void CirclesPackShape::Draw(ref_ptr<dp::GraphicsContext> context, CirclesPackRenderData & data)
{
  ASSERT_NOT_EQUAL(data.m_pointsCount, 0, ());

  uint32_t constexpr kVerticesInPoint = dp::Batcher::VertexPerQuad;
  uint32_t constexpr kIndicesInPoint = dp::Batcher::IndexPerQuad;

  std::vector<CirclesPackStaticVertex> staticVertexData;
  staticVertexData.reserve(data.m_pointsCount * kVerticesInPoint);
  static_assert(kVerticesInPoint == 4, "According to the loop below");
  for (size_t i = 0; i < data.m_pointsCount; ++i)
  {
    staticVertexData.emplace_back(CirclesPackStaticVertex::TNormal(-1.0f, 1.0f, 1.0f));
    staticVertexData.emplace_back(CirclesPackStaticVertex::TNormal(-1.0f, -1.0f, 1.0f));
    staticVertexData.emplace_back(CirclesPackStaticVertex::TNormal(1.0f, 1.0f, 1.0f));
    staticVertexData.emplace_back(CirclesPackStaticVertex::TNormal(1.0f, -1.0f, 1.0f));
  }

  std::vector<CirclesPackDynamicVertex> dynamicVertexData;
  dynamicVertexData.resize(data.m_pointsCount * kVerticesInPoint);

  dp::Batcher batcher(data.m_pointsCount * kIndicesInPoint, data.m_pointsCount * kVerticesInPoint);
  batcher.SetBatcherHash(static_cast<uint64_t>(BatcherBucket::Overlay));
  dp::SessionGuard guard(context, batcher, [&data](dp::RenderState const & state, drape_ptr<dp::RenderBucket> && b)
  {
    data.m_bucket = std::move(b);
    data.m_state = state;
  });

  drape_ptr<dp::OverlayHandle> handle = make_unique_dp<CirclesPackHandle>(data.m_pointsCount);

  dp::AttributeProvider provider(2 /* stream count */, static_cast<uint32_t>(staticVertexData.size()));
  provider.InitStream(0 /* stream index */, GetCirclesPackStaticBindingInfo(), make_ref(staticVertexData.data()));
  provider.InitStream(1 /* stream index */, GetCirclesPackDynamicBindingInfo(), make_ref(dynamicVertexData.data()));
  batcher.InsertListOfStrip(context, GetCirclesPackState(), make_ref(&provider), std::move(handle), kVerticesInPoint);

  context->Flush();
}
}  // namespace df