Basic placefile lines rendering

Desired to make the line styling look more like warning boxes

scwx-qt/scwx-qt.cmake

@@ -58,12 +58,14 @@ set(SRC_GL source/scwx/qt/gl/gl_context.cpp
 set(HDR_GL_DRAW source/scwx/qt/gl/draw/draw_item.hpp
                 source/scwx/qt/gl/draw/geo_line.hpp
                 source/scwx/qt/gl/draw/placefile_icons.hpp
+                source/scwx/qt/gl/draw/placefile_lines.hpp
                 source/scwx/qt/gl/draw/placefile_polygons.hpp
                 source/scwx/qt/gl/draw/placefile_text.hpp
                 source/scwx/qt/gl/draw/rectangle.hpp)
 set(SRC_GL_DRAW source/scwx/qt/gl/draw/draw_item.cpp
                 source/scwx/qt/gl/draw/geo_line.cpp
                 source/scwx/qt/gl/draw/placefile_icons.cpp
+                source/scwx/qt/gl/draw/placefile_lines.cpp
                 source/scwx/qt/gl/draw/placefile_polygons.cpp
                 source/scwx/qt/gl/draw/placefile_text.cpp
                 source/scwx/qt/gl/draw/rectangle.cpp)

scwx-qt/source/scwx/qt/gl/draw/placefile_lines.cpp

@@ -0,0 +1,386 @@
+#include <scwx/qt/gl/draw/placefile_lines.hpp>
+#include <scwx/qt/util/geographic_lib.hpp>
+#include <scwx/qt/util/maplibre.hpp>
+#include <scwx/qt/util/texture_atlas.hpp>
+#include <scwx/util/logger.hpp>
+
+#include <QUrl>
+#include <boost/unordered/unordered_flat_map.hpp>
+
+namespace scwx
+{
+namespace qt
+{
+namespace gl
+{
+namespace draw
+{
+
+static const std::string logPrefix_ = "scwx::qt::gl::draw::placefile_lines";
+static const auto        logger_    = scwx::util::Logger::Create(logPrefix_);
+
+static constexpr std::size_t kNumRectangles        = 1;
+static constexpr std::size_t kNumTriangles         = kNumRectangles * 2;
+static constexpr std::size_t kVerticesPerTriangle  = 3;
+static constexpr std::size_t kVerticesPerRectangle = kVerticesPerTriangle * 2;
+static constexpr std::size_t kPointsPerVertex      = 11;
+static constexpr std::size_t kBufferLength =
+   kNumTriangles * kVerticesPerTriangle * kPointsPerVertex;
+
+static const std::string kTextureName_ = "lines/default-1x7";
+
+class PlacefileLines::Impl
+{
+public:
+   explicit Impl(std::shared_ptr<GlContext> context) :
+       context_ {context},
+       shaderProgram_ {nullptr},
+       uMVPMatrixLocation_(GL_INVALID_INDEX),
+       uMapMatrixLocation_(GL_INVALID_INDEX),
+       uMapScreenCoordLocation_(GL_INVALID_INDEX),
+       uMapDistanceLocation_(GL_INVALID_INDEX),
+       vao_ {GL_INVALID_INDEX},
+       vbo_ {GL_INVALID_INDEX},
+       numVertices_ {0}
+   {
+   }
+
+   ~Impl() {}
+
+   std::shared_ptr<GlContext> context_;
+
+   bool dirty_ {false};
+   bool thresholded_ {false};
+
+   std::mutex lineMutex_;
+
+   std::vector<std::shared_ptr<const gr::Placefile::LineDrawItem>>
+      currentLineList_ {};
+   std::vector<std::shared_ptr<const gr::Placefile::LineDrawItem>>
+      newLineList_ {};
+
+   std::size_t currentNumLines_ {};
+   std::size_t newNumLines_ {};
+
+   std::vector<float> lineBuffer_ {};
+   std::vector<GLint> thresholdBuffer_ {};
+
+   std::shared_ptr<ShaderProgram> shaderProgram_;
+   GLint                          uMVPMatrixLocation_;
+   GLint                          uMapMatrixLocation_;
+   GLint                          uMapScreenCoordLocation_;
+   GLint                          uMapDistanceLocation_;
+
+   GLuint                vao_;
+   std::array<GLuint, 2> vbo_;
+
+   GLsizei numVertices_;
+
+   void UpdateBuffers();
+   void Update(bool textureAtlasChanged);
+};
+
+PlacefileLines::PlacefileLines(std::shared_ptr<GlContext> context) :
+    DrawItem(context->gl()), p(std::make_unique<Impl>(context))
+{
+}
+PlacefileLines::~PlacefileLines() = default;
+
+PlacefileLines::PlacefileLines(PlacefileLines&&) noexcept            = default;
+PlacefileLines& PlacefileLines::operator=(PlacefileLines&&) noexcept = default;
+
+void PlacefileLines::set_thresholded(bool thresholded)
+{
+   p->thresholded_ = thresholded;
+}
+
+void PlacefileLines::Initialize()
+{
+   gl::OpenGLFunctions& gl = p->context_->gl();
+
+   p->shaderProgram_ = p->context_->GetShaderProgram(
+      {{GL_VERTEX_SHADER, ":/gl/geo_texture2d.vert"},
+       {GL_GEOMETRY_SHADER, ":/gl/threshold.geom"},
+       {GL_FRAGMENT_SHADER, ":/gl/color.frag"}});
+
+   p->uMVPMatrixLocation_ = p->shaderProgram_->GetUniformLocation("uMVPMatrix");
+   p->uMapMatrixLocation_ = p->shaderProgram_->GetUniformLocation("uMapMatrix");
+   p->uMapScreenCoordLocation_ =
+      p->shaderProgram_->GetUniformLocation("uMapScreenCoord");
+   p->uMapDistanceLocation_ =
+      p->shaderProgram_->GetUniformLocation("uMapDistance");
+
+   gl.glGenVertexArrays(1, &p->vao_);
+   gl.glGenBuffers(2, p->vbo_.data());
+
+   gl.glBindVertexArray(p->vao_);
+   gl.glBindBuffer(GL_ARRAY_BUFFER, p->vbo_[0]);
+   gl.glBufferData(GL_ARRAY_BUFFER, 0u, nullptr, GL_DYNAMIC_DRAW);
+
+   // aLatLong
+   gl.glVertexAttribPointer(0,
+                            2,
+                            GL_FLOAT,
+                            GL_FALSE,
+                            kPointsPerVertex * sizeof(float),
+                            static_cast<void*>(0));
+   gl.glEnableVertexAttribArray(0);
+
+   // aXYOffset
+   gl.glVertexAttribPointer(1,
+                            2,
+                            GL_FLOAT,
+                            GL_FALSE,
+                            kPointsPerVertex * sizeof(float),
+                            reinterpret_cast<void*>(2 * sizeof(float)));
+   gl.glEnableVertexAttribArray(1);
+
+   // aTexCoord
+   gl.glVertexAttribPointer(2,
+                            2,
+                            GL_FLOAT,
+                            GL_FALSE,
+                            kPointsPerVertex * sizeof(float),
+                            reinterpret_cast<void*>(4 * sizeof(float)));
+   gl.glEnableVertexAttribArray(2);
+
+   // aModulate
+   gl.glVertexAttribPointer(3,
+                            4,
+                            GL_FLOAT,
+                            GL_FALSE,
+                            kPointsPerVertex * sizeof(float),
+                            reinterpret_cast<void*>(6 * sizeof(float)));
+   gl.glEnableVertexAttribArray(3);
+
+   // aAngle
+   gl.glVertexAttribPointer(4,
+                            1,
+                            GL_FLOAT,
+                            GL_FALSE,
+                            kPointsPerVertex * sizeof(float),
+                            reinterpret_cast<void*>(10 * sizeof(float)));
+   gl.glEnableVertexAttribArray(4);
+
+   gl.glBindBuffer(GL_ARRAY_BUFFER, p->vbo_[1]);
+   gl.glBufferData(GL_ARRAY_BUFFER, 0u, nullptr, GL_DYNAMIC_DRAW);
+
+   // aThreshold
+   gl.glVertexAttribIPointer(5, //
+                             1,
+                             GL_INT,
+                             0,
+                             static_cast<void*>(0));
+   gl.glVertexAttribDivisor(5, 2); // One value per rectangle
+   gl.glEnableVertexAttribArray(5);
+
+   p->dirty_ = true;
+}
+
+void PlacefileLines::Render(
+   const QMapLibreGL::CustomLayerRenderParameters& params,
+   bool                                            textureAtlasChanged)
+{
+   std::unique_lock lock {p->lineMutex_};
+
+   if (!p->currentLineList_.empty())
+   {
+      gl::OpenGLFunctions& gl = p->context_->gl();
+
+      gl.glBindVertexArray(p->vao_);
+
+      p->Update(textureAtlasChanged);
+      p->shaderProgram_->Use();
+      UseRotationProjection(params, p->uMVPMatrixLocation_);
+      UseMapProjection(
+         params, p->uMapMatrixLocation_, p->uMapScreenCoordLocation_);
+
+      if (p->thresholded_)
+      {
+         // If thresholding is enabled, set the map distance
+         units::length::nautical_miles<float> mapDistance =
+            util::maplibre::GetMapDistance(params);
+         gl.glUniform1f(p->uMapDistanceLocation_, mapDistance.value());
+      }
+      else
+      {
+         // If thresholding is disabled, set the map distance to 0
+         gl.glUniform1f(p->uMapDistanceLocation_, 0.0f);
+      }
+
+      // Interpolate texture coordinates
+      gl.glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+      gl.glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+
+      // Draw icons
+      gl.glDrawArrays(GL_TRIANGLES, 0, p->numVertices_);
+   }
+}
+
+void PlacefileLines::Deinitialize()
+{
+   gl::OpenGLFunctions& gl = p->context_->gl();
+
+   gl.glDeleteVertexArrays(1, &p->vao_);
+   gl.glDeleteBuffers(2, p->vbo_.data());
+
+   std::unique_lock lock {p->lineMutex_};
+
+   p->currentLineList_.clear();
+   p->lineBuffer_.clear();
+   p->thresholdBuffer_.clear();
+}
+
+void PlacefileLines::StartLines()
+{
+   // Clear the new buffer
+   p->newLineList_.clear();
+
+   p->newNumLines_ = 0u;
+}
+
+void PlacefileLines::AddLine(
+   const std::shared_ptr<gr::Placefile::LineDrawItem>& di)
+{
+   if (di != nullptr)
+   {
+      p->newLineList_.emplace_back(di);
+      if (!di->elements_.empty())
+      {
+         p->newNumLines_ += di->elements_.size() - 1;
+      }
+   }
+}
+
+void PlacefileLines::FinishLines()
+{
+   std::unique_lock lock {p->lineMutex_};
+
+   // Swap buffers
+   p->currentLineList_.swap(p->newLineList_);
+
+   // Clear the new buffers
+   p->newLineList_.clear();
+
+   // Update the number of lines
+   p->currentNumLines_ = p->newNumLines_;
+
+   // Mark the draw item dirty
+   p->dirty_ = true;
+}
+
+void PlacefileLines::Impl::UpdateBuffers()
+{
+   auto texture =
+      util::TextureAtlas::Instance().GetTextureAttributes(kTextureName_);
+
+   // Texture coordinates (rotated)
+   const float ls = texture.tTop_;
+   const float rs = texture.tBottom_;
+   const float tt = texture.sLeft_;
+   const float bt = texture.sRight_;
+
+   lineBuffer_.clear();
+   lineBuffer_.reserve(currentNumLines_ * kBufferLength);
+   thresholdBuffer_.clear();
+   thresholdBuffer_.reserve(currentNumLines_);
+   numVertices_ = 0;
+
+   for (auto& di : currentLineList_)
+   {
+      // Threshold value
+      units::length::nautical_miles<double> threshold = di->threshold_;
+      GLint thresholdValue = static_cast<GLint>(std::round(threshold.value()));
+
+      // TODO: Angle in degrees
+      // const float a = 0.0f;
+
+      // Line width / half width
+      const float lw = static_cast<float>(di->width_);
+      const float hw = lw * 0.5f;
+
+      // For each element pair inside a Line statement
+      for (std::size_t i = 0; i < di->elements_.size() - 1; ++i)
+      {
+         // Latitude and longitude coordinates in degrees
+         const float lat1 = static_cast<float>(di->elements_[i].latitude_);
+         const float lon1 = static_cast<float>(di->elements_[i].longitude_);
+         const float lat2 = static_cast<float>(di->elements_[i + 1].latitude_);
+         const float lon2 = static_cast<float>(di->elements_[i + 1].longitude_);
+
+         // TODO: Base X/Y offsets in pixels
+         // const float x1 = static_cast<float>(di->elements_[i].x_);
+         // const float y1 = static_cast<float>(di->elements_[i].y_);
+         // const float x2 = static_cast<float>(di->elements_[i + 1].x_);
+         // const float y2 = static_cast<float>(di->elements_[i + 1].y_);
+
+         // TODO: Refactor this to placefile update time instead of buffer time
+         const units::angle::degrees<double> angle =
+            util::GeographicLib::GetAngle(lat1, lon1, lat2, lon2);
+         const float a = static_cast<float>(angle.value());
+
+         // Final X/Y offsets in pixels
+         const float lx = -hw;
+         const float rx = +hw;
+         const float ty = +hw;
+         const float by = -hw;
+
+         // Modulate color
+         const float mc0 = di->color_[0] / 255.0f;
+         const float mc1 = di->color_[1] / 255.0f;
+         const float mc2 = di->color_[2] / 255.0f;
+         const float mc3 = di->color_[3] / 255.0f;
+
+         lineBuffer_.insert(
+            lineBuffer_.end(),
+            {
+               // Icon
+               lat1, lon1, lx, by, ls, bt, mc0, mc1, mc2, mc3, a, // BL
+               lat2, lon2, lx, ty, ls, tt, mc0, mc1, mc2, mc3, a, // TL
+               lat1, lon1, rx, by, rs, bt, mc0, mc1, mc2, mc3, a, // BR
+               lat1, lon1, rx, by, rs, bt, mc0, mc1, mc2, mc3, a, // BR
+               lat2, lon2, rx, ty, rs, tt, mc0, mc1, mc2, mc3, a, // TR
+               lat2, lon2, lx, ty, ls, tt, mc0, mc1, mc2, mc3, a  // TL
+            });
+         thresholdBuffer_.push_back(thresholdValue);
+      }
+   }
+
+   dirty_ = true;
+}
+
+void PlacefileLines::Impl::Update(bool textureAtlasChanged)
+{
+   // If the texture atlas has changed
+   if (dirty_ || textureAtlasChanged)
+   {
+      // Update OpenGL buffer data
+      UpdateBuffers();
+
+      gl::OpenGLFunctions& gl = context_->gl();
+
+      // Buffer vertex data
+      gl.glBindBuffer(GL_ARRAY_BUFFER, vbo_[0]);
+      gl.glBufferData(GL_ARRAY_BUFFER,
+                      sizeof(float) * lineBuffer_.size(),
+                      lineBuffer_.data(),
+                      GL_DYNAMIC_DRAW);
+
+      // Buffer threshold data
+      gl.glBindBuffer(GL_ARRAY_BUFFER, vbo_[1]);
+      gl.glBufferData(GL_ARRAY_BUFFER,
+                      sizeof(GLint) * thresholdBuffer_.size(),
+                      thresholdBuffer_.data(),
+                      GL_DYNAMIC_DRAW);
+
+      numVertices_ =
+         static_cast<GLsizei>(lineBuffer_.size() / kVerticesPerRectangle);
+   }
+
+   dirty_ = false;
+}
+
+} // namespace draw
+} // namespace gl
+} // namespace qt
+} // namespace scwx

scwx-qt/source/scwx/qt/gl/draw/placefile_lines.hpp

@@ -0,0 +1,61 @@
+#pragma once
+
+#include <scwx/qt/gl/gl_context.hpp>
+#include <scwx/qt/gl/draw/draw_item.hpp>
+#include <scwx/gr/placefile.hpp>
+
+namespace scwx
+{
+namespace qt
+{
+namespace gl
+{
+namespace draw
+{
+
+class PlacefileLines : public DrawItem
+{
+public:
+   explicit PlacefileLines(std::shared_ptr<GlContext> context);
+   ~PlacefileLines();
+
+   PlacefileLines(const PlacefileLines&)            = delete;
+   PlacefileLines& operator=(const PlacefileLines&) = delete;
+
+   PlacefileLines(PlacefileLines&&) noexcept;
+   PlacefileLines& operator=(PlacefileLines&&) noexcept;
+
+   void set_thresholded(bool thresholded);
+
+   void Initialize() override;
+   void Render(const QMapLibreGL::CustomLayerRenderParameters& params,
+               bool textureAtlasChanged) override;
+   void Deinitialize() override;
+
+   /**
+    * Resets and prepares the draw item for adding a new set of lines.
+    */
+   void StartLines();
+
+   /**
+    * Adds a placefile line to the internal draw list.
+    *
+    * @param [in] di Placefile line
+    */
+   void AddLine(const std::shared_ptr<gr::Placefile::LineDrawItem>& di);
+
+   /**
+    * Finalizes the draw item after adding new lines.
+    */
+   void FinishLines();
+
+private:
+   class Impl;
+
+   std::unique_ptr<Impl> p;
+};
+
+} // namespace draw
+} // namespace gl
+} // namespace qt
+} // namespace scwx

scwx-qt/source/scwx/qt/map/placefile_layer.cpp

@@ -1,5 +1,6 @@
 #include <scwx/qt/map/placefile_layer.hpp>
 #include <scwx/qt/gl/draw/placefile_icons.hpp>
+#include <scwx/qt/gl/draw/placefile_lines.hpp>
 #include <scwx/qt/gl/draw/placefile_polygons.hpp>
 #include <scwx/qt/gl/draw/placefile_text.hpp>
 #include <scwx/qt/manager/placefile_manager.hpp>
@@ -27,6 +28,7 @@ public:
        self_ {self},
        placefileName_ {placefileName},
        placefileIcons_ {std::make_shared<gl::draw::PlacefileIcons>(context)},
+       placefileLines_ {std::make_shared<gl::draw::PlacefileLines>(context)},
        placefilePolygons_ {
           std::make_shared<gl::draw::PlacefilePolygons>(context)},
        placefileText_ {
@@ -46,6 +48,7 @@ public:
    std::mutex  dataMutex_ {};
 
    std::shared_ptr<gl::draw::PlacefileIcons>    placefileIcons_;
+   std::shared_ptr<gl::draw::PlacefileLines>    placefileLines_;
    std::shared_ptr<gl::draw::PlacefilePolygons> placefilePolygons_;
    std::shared_ptr<gl::draw::PlacefileText>     placefileText_;
 };
@@ -56,6 +59,7 @@ PlacefileLayer::PlacefileLayer(std::shared_ptr<MapContext> context,
     p(std::make_unique<PlacefileLayer::Impl>(this, context, placefileName))
 {
    AddDrawItem(p->placefileIcons_);
+   AddDrawItem(p->placefileLines_);
    AddDrawItem(p->placefilePolygons_);
    AddDrawItem(p->placefileText_);
 
@@ -119,6 +123,7 @@ void PlacefileLayer::Render(
       bool thresholded =
          placefileManager->placefile_thresholded(placefile->name());
       p->placefileIcons_->set_thresholded(thresholded);
+      p->placefileLines_->set_thresholded(thresholded);
       p->placefilePolygons_->set_thresholded(thresholded);
       p->placefileText_->set_thresholded(thresholded);
    }
@@ -156,6 +161,7 @@ void PlacefileLayer::ReloadData()
 
          // Start draw items
          p->placefileIcons_->StartIcons();
+         p->placefileLines_->StartLines();
          p->placefilePolygons_->StartPolygons();
          p->placefileText_->StartText();
 
@@ -178,6 +184,12 @@ void PlacefileLayer::ReloadData()
                      drawItem));
                break;
 
+            case gr::Placefile::ItemType::Line:
+               p->placefileLines_->AddLine(
+                  std::static_pointer_cast<gr::Placefile::LineDrawItem>(
+                     drawItem));
+               break;
+
             case gr::Placefile::ItemType::Polygon:
                p->placefilePolygons_->AddPolygon(
                   std::static_pointer_cast<gr::Placefile::PolygonDrawItem>(
@@ -191,6 +203,7 @@ void PlacefileLayer::ReloadData()
 
          // Finish draw items
          p->placefileIcons_->FinishIcons();
+         p->placefileLines_->FinishLines();
          p->placefilePolygons_->FinishPolygons();
          p->placefileText_->FinishText();
 

scwx-qt/source/scwx/qt/util/geographic_lib.cpp

@@ -18,12 +18,21 @@ const ::GeographicLib::Geodesic& DefaultGeodesic()
    return geodesic_;
 }
 
+units::angle::degrees<double>
+GetAngle(double lat1, double lon1, double lat2, double lon2)
+{
+   double azi1;
+   double azi2;
+   DefaultGeodesic().Inverse(lat1, lon1, lat2, lon2, azi1, azi2);
+
+   return units::angle::degrees<double> {azi1};
+}
+
 units::length::meters<double>
 GetDistance(double lat1, double lon1, double lat2, double lon2)
 {
    double distance;
-   util::GeographicLib::DefaultGeodesic().Inverse(
-      lat1, lon1, lat2, lon2, distance);
+   DefaultGeodesic().Inverse(lat1, lon1, lat2, lon2, distance);
 
    return units::length::meters<double> {distance};
 }

scwx-qt/source/scwx/qt/util/geographic_lib.hpp

@@ -1,6 +1,7 @@
 #pragma once
 
 #include <GeographicLib/Geodesic.hpp>
+#include <units/angle.h>
 #include <units/length.h>
 
 namespace scwx
@@ -19,6 +20,19 @@ namespace GeographicLib
  */
 const ::GeographicLib::Geodesic& DefaultGeodesic();
 
+/**
+ * Get the angle between two points.
+ *
+ * @param [in] lat1 latitude of point 1 (degrees)
+ * @param [in] lon1 longitude of point 1 (degrees)
+ * @param [in] lat2 latitude of point 2 (degrees)
+ * @param [in] lon2 longitude of point 2 (degrees)
+ *
+ * @return angle between point 1 and point 2
+ */
+units::angle::degrees<double>
+GetAngle(double lat1, double lon1, double lat2, double lon2);
+
 /**
  * Get the distance between two points.
  *