First attempt at rendering placefile icons, does not work yet

scwx-qt/gl/geo_texture2d.vert

@@ -0,0 +1,42 @@
+#version 330 core
+
+#define DEGREES_MAX   360.0f
+#define LATITUDE_MAX  85.051128779806604f
+#define LONGITUDE_MAX 180.0f
+#define PI            3.1415926535897932384626433f
+#define RAD2DEG       57.295779513082320876798156332941f
+
+layout (location = 0) in vec2  aLatLong;
+layout (location = 1) in vec2  aXYOffset;
+layout (location = 2) in vec2  aTexCoord;
+layout (location = 3) in vec4  aModulate;
+layout (location = 4) in float aAngle;
+
+uniform mat4 uMVPMatrix;
+uniform mat4 uMapMatrix;
+uniform vec2 uMapScreenCoord;
+
+smooth out vec2 texCoord;
+flat   out vec4 modulate;
+
+vec2 latLngToScreenCoordinate(in vec2 latLng)
+{
+   vec2 p;
+   latLng.x = clamp(latLng.x, -LATITUDE_MAX, LATITUDE_MAX);
+   p.xy     = vec2(LONGITUDE_MAX + latLng.y,
+                   -(LONGITUDE_MAX - RAD2DEG * log(tan(PI / 4 + latLng.x * PI / DEGREES_MAX))));
+   return p;
+}
+
+void main()
+{
+   // Pass the texture coordinate and color modulate to the fragment shader
+   texCoord = aTexCoord;
+   modulate = aModulate;
+
+   vec2 p = latLngToScreenCoordinate(aLatLong) - uMapScreenCoord;
+
+   // Transform the position to screen coordinates
+   gl_Position = uMapMatrix * vec4(p, 0.0f, 1.0f) -
+                 uMVPMatrix * vec4(aXYOffset, 0.0f, 0.0f);
+}

scwx-qt/scwx-qt.cmake

@@ -57,9 +57,11 @@ set(SRC_GL source/scwx/qt/gl/gl_context.cpp
            source/scwx/qt/gl/text_shader.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/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/rectangle.cpp)
 set(HDR_MANAGER source/scwx/qt/manager/placefile_manager.hpp
                 source/scwx/qt/manager/radar_product_manager.hpp
@@ -240,6 +242,7 @@ set(RESOURCE_FILES scwx-qt.qrc)
 set(SHADER_FILES gl/color.frag
                  gl/color.vert
                  gl/geo_line.vert
+                 gl/geo_texture2d.vert
                  gl/radar.frag
                  gl/radar.vert
                  gl/text.frag

scwx-qt/scwx-qt.qrc

@@ -3,6 +3,7 @@
         <file>gl/color.frag</file>
         <file>gl/color.vert</file>
         <file>gl/geo_line.vert</file>
+        <file>gl/geo_texture2d.vert</file>
         <file>gl/radar.frag</file>
         <file>gl/radar.vert</file>
         <file>gl/text.frag</file>

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

@@ -0,0 +1,370 @@
+#include <scwx/qt/gl/draw/placefile_icons.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_icons";
+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;
+
+struct PlacefileIconInfo
+{
+   PlacefileIconInfo(
+      const std::shared_ptr<const gr::Placefile::IconFile>& iconFile,
+      const std::string&                                    baseUrlString) :
+       iconFile_ {iconFile}
+   {
+      // Resolve using base URL
+      auto baseUrl = QUrl::fromUserInput(QString::fromStdString(baseUrlString));
+      auto relativeUrl = QUrl(QString::fromStdString(iconFile->filename_));
+
+      texture_ = util::TextureAtlas::Instance().GetTextureAttributes(
+         baseUrl.resolved(relativeUrl).toString().toStdString());
+
+      if (iconFile->iconWidth_ > 0 && iconFile->iconHeight_ > 0)
+      {
+         columns_ = texture_.size_.x / iconFile->iconWidth_;
+         rows_    = texture_.size_.y / iconFile->iconHeight_;
+      }
+      else
+      {
+         columns_ = 0u;
+         rows_    = 0u;
+      }
+
+      numIcons_ = columns_ * rows_;
+
+      float xFactor = 0.0f;
+      float yFactor = 0.0f;
+
+      if (texture_.size_.x > 0 && texture_.size_.y > 0)
+      {
+         xFactor = (texture_.sRight_ - texture_.sLeft_) / texture_.size_.x;
+         yFactor = (texture_.tBottom_ - texture_.tTop_) / texture_.size_.y;
+      }
+
+      scaledWidth_  = iconFile_->iconWidth_ * xFactor;
+      scaledHeight_ = iconFile_->iconHeight_ * yFactor;
+   }
+
+   std::shared_ptr<const gr::Placefile::IconFile> iconFile_;
+   util::TextureAttributes                        texture_;
+   std::size_t                                    rows_ {};
+   std::size_t                                    columns_ {};
+   std::size_t                                    numIcons_ {};
+   float                                          scaledWidth_ {};
+   float                                          scaledHeight_ {};
+};
+
+class PlacefileIcons::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),
+       vao_ {GL_INVALID_INDEX},
+       vbo_ {GL_INVALID_INDEX},
+       numVertices_ {0}
+   {
+   }
+
+   ~Impl() {}
+
+   std::shared_ptr<GlContext> context_;
+
+   bool dirty_ {false};
+
+   boost::unordered_flat_map<std::size_t, const PlacefileIconInfo>
+      iconFiles_ {};
+
+   std::vector<std::shared_ptr<const gr::Placefile::IconDrawItem>> iconList_ {};
+
+   std::shared_ptr<ShaderProgram> shaderProgram_;
+   GLint                          uMVPMatrixLocation_;
+   GLint                          uMapMatrixLocation_;
+   GLint                          uMapScreenCoordLocation_;
+
+   GLuint vao_;
+   GLuint vbo_;
+
+   GLsizei numVertices_;
+
+   void Update();
+};
+
+PlacefileIcons::PlacefileIcons(std::shared_ptr<GlContext> context) :
+    DrawItem(context->gl()), p(std::make_unique<Impl>(context))
+{
+}
+PlacefileIcons::~PlacefileIcons() = default;
+
+PlacefileIcons::PlacefileIcons(PlacefileIcons&&) noexcept            = default;
+PlacefileIcons& PlacefileIcons::operator=(PlacefileIcons&&) noexcept = default;
+
+void PlacefileIcons::Initialize()
+{
+   gl::OpenGLFunctions& gl = p->context_->gl();
+
+   p->shaderProgram_ = p->context_->GetShaderProgram(":/gl/geo_texture2d.vert",
+                                                     ":/gl/texture2d.frag");
+
+   p->uMVPMatrixLocation_ =
+      gl.glGetUniformLocation(p->shaderProgram_->id(), "uMVPMatrix");
+   if (p->uMVPMatrixLocation_ == -1)
+   {
+      logger_->warn("Could not find uMVPMatrix");
+   }
+
+   p->uMapMatrixLocation_ =
+      gl.glGetUniformLocation(p->shaderProgram_->id(), "uMapMatrix");
+   if (p->uMapMatrixLocation_ == -1)
+   {
+      logger_->warn("Could not find uMapMatrix");
+   }
+
+   p->uMapScreenCoordLocation_ =
+      gl.glGetUniformLocation(p->shaderProgram_->id(), "uMapScreenCoord");
+   if (p->uMapScreenCoordLocation_ == -1)
+   {
+      logger_->warn("Could not find uMapScreenCoord");
+   }
+
+   gl.glGenVertexArrays(1, &p->vao_);
+   gl.glGenBuffers(1, &p->vbo_);
+
+   gl.glBindVertexArray(p->vao_);
+   gl.glBindBuffer(GL_ARRAY_BUFFER, p->vbo_);
+   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);
+
+   p->dirty_ = true;
+}
+
+void PlacefileIcons::Render(
+   const QMapLibreGL::CustomLayerRenderParameters& params)
+{
+   if (!p->iconList_.empty())
+   {
+      gl::OpenGLFunctions& gl = p->context_->gl();
+
+      gl.glBindVertexArray(p->vao_);
+      gl.glBindBuffer(GL_ARRAY_BUFFER, p->vbo_);
+
+      p->Update();
+      p->shaderProgram_->Use();
+      UseDefaultProjection(params, p->uMVPMatrixLocation_);
+      UseMapProjection(
+         params, p->uMapMatrixLocation_, p->uMapScreenCoordLocation_);
+
+      // Draw icons
+      gl.glDrawArrays(GL_TRIANGLES, 0, p->numVertices_);
+   }
+}
+
+void PlacefileIcons::Deinitialize()
+{
+   gl::OpenGLFunctions& gl = p->context_->gl();
+
+   gl.glDeleteVertexArrays(1, &p->vao_);
+   gl.glDeleteBuffers(1, &p->vbo_);
+}
+
+void PlacefileIcons::SetIconFiles(
+   const std::vector<std::shared_ptr<const gr::Placefile::IconFile>>& iconFiles,
+   const std::string&                                                 baseUrl)
+{
+   p->dirty_ = true;
+
+   // Populate icon file map
+   p->iconFiles_.clear();
+
+   for (auto& file : iconFiles)
+   {
+      p->iconFiles_.emplace(
+         std::piecewise_construct,
+         std::tuple {file->fileNumber_},
+         std::forward_as_tuple(PlacefileIconInfo {file, baseUrl}));
+   }
+}
+
+void PlacefileIcons::AddIcon(
+   const std::shared_ptr<gr::Placefile::IconDrawItem>& di)
+{
+   if (di != nullptr)
+   {
+      p->iconList_.emplace_back(di);
+      p->dirty_ = true;
+   }
+}
+
+void PlacefileIcons::Reset()
+{
+   // Clear the icon list, and mark the draw item dirty
+   p->iconList_.clear();
+   p->dirty_ = true;
+}
+
+void PlacefileIcons::Impl::Update()
+{
+   if (dirty_)
+   {
+      static std::vector<float> buffer {};
+      buffer.clear();
+      buffer.reserve(iconList_.size() * kBufferLength);
+      numVertices_ = 0;
+
+      for (auto& di : iconList_)
+      {
+         auto it = iconFiles_.find(di->fileNumber_);
+         if (it == iconFiles_.cend())
+         {
+            // No file found
+            logger_->trace("Could not find file number: {}", di->fileNumber_);
+            continue;
+         }
+
+         auto& icon = it->second;
+
+         // Validate icon
+         if (di->iconNumber_ == 0 || di->iconNumber_ > icon.numIcons_)
+         {
+            // No icon found
+            logger_->trace("Invalid icon number: {}", di->iconNumber_);
+            continue;
+         }
+
+         // Latitude and longitude coordinates in degrees
+         const float lat = static_cast<float>(di->latitude_);
+         const float lon = static_cast<float>(di->longitude_);
+
+         // Base X/Y offsets in pixels
+         const float x = static_cast<float>(di->x_);
+         const float y = static_cast<float>(di->y_);
+
+         // Half icon size
+         const float hw = static_cast<float>(icon.iconFile_->iconWidth_) * 0.5f;
+         const float hh =
+            static_cast<float>(icon.iconFile_->iconHeight_) * 0.5f;
+
+         // Final X/Y offsets in pixels
+         const float lx = x - hw;
+         const float rx = x + hw;
+         const float by = y - hh;
+         const float ty = y + hh;
+
+         // Angle in degrees
+         // TODO: Properly convert
+         const float a = static_cast<float>(di->angle_.value());
+
+         // Texture coordinates
+         const std::size_t iconRow    = (di->iconNumber_ - 1) / icon.columns_;
+         const std::size_t iconColumn = (di->iconNumber_ - 1) % icon.columns_;
+
+         const float iconX = iconColumn * icon.scaledWidth_;
+         const float iconY = iconRow * icon.scaledHeight_;
+
+         const float ls = icon.texture_.sLeft_ + iconX;
+         const float rs = ls + icon.scaledWidth_;
+         const float tt = icon.texture_.tTop_ + iconY;
+         const float bt = tt + icon.scaledHeight_;
+
+         // Fixed modulate color
+         const float mc0 = 1.0f;
+         const float mc1 = 1.0f;
+         const float mc2 = 1.0f;
+         const float mc3 = 1.0f;
+
+         buffer.insert(buffer.end(),
+                       {
+                          // Icon
+                          lat, lon, lx, by, ls, bt, mc0, mc1, mc2, mc3, a, // BL
+                          lat, lon, lx, by, ls, tt, mc0, mc1, mc2, mc3, a, // TL
+                          lat, lon, rx, ty, rs, bt, mc0, mc1, mc2, mc3, a, // BR
+                          lat, lon, rx, ty, rs, bt, mc0, mc1, mc2, mc3, a, // BR
+                          lat, lon, rx, ty, rs, tt, mc0, mc1, mc2, mc3, a, // TR
+                          lat, lon, lx, by, ls, tt, mc0, mc1, mc2, mc3, a  // TL
+                       });
+
+         numVertices_ += 6;
+      }
+
+      gl::OpenGLFunctions& gl = context_->gl();
+
+      gl.glBufferData(GL_ARRAY_BUFFER,
+                      sizeof(float) * buffer.size(),
+                      buffer.data(),
+                      GL_DYNAMIC_DRAW);
+
+      dirty_ = false;
+   }
+}
+
+} // namespace draw
+} // namespace gl
+} // namespace qt
+} // namespace scwx

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

@@ -0,0 +1,66 @@
+#pragma once
+
+#include <scwx/qt/gl/gl_context.hpp>
+#include <scwx/qt/gl/draw/draw_item.hpp>
+#include <scwx/gr/placefile.hpp>
+
+#include <boost/gil.hpp>
+
+namespace scwx
+{
+namespace qt
+{
+namespace gl
+{
+namespace draw
+{
+
+class PlacefileIcons : public DrawItem
+{
+public:
+   explicit PlacefileIcons(std::shared_ptr<GlContext> context);
+   ~PlacefileIcons();
+
+   PlacefileIcons(const PlacefileIcons&)            = delete;
+   PlacefileIcons& operator=(const PlacefileIcons&) = delete;
+
+   PlacefileIcons(PlacefileIcons&&) noexcept;
+   PlacefileIcons& operator=(PlacefileIcons&&) noexcept;
+
+   void Initialize() override;
+   void Render(const QMapLibreGL::CustomLayerRenderParameters& params) override;
+   void Deinitialize() override;
+
+   /**
+    * Configures the textures for drawing the placefile icons.
+    *
+    * @param [in] iconFiles A list of icon files
+    * @param [in] baseUrl The base URL of the placefile
+    */
+   void SetIconFiles(
+      const std::vector<std::shared_ptr<const gr::Placefile::IconFile>>&
+                         iconFiles,
+      const std::string& baseUrl);
+
+   /**
+    * Adds a placefile icon to the internal draw list.
+    *
+    * @param [in] di Placefile icon
+    */
+   void AddIcon(const std::shared_ptr<gr::Placefile::IconDrawItem>& di);
+
+   /**
+    * Resets the list of icons in preparation for rendering a new frame.
+    */
+   void Reset();
+
+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

@@ -1,4 +1,5 @@
 #include <scwx/qt/map/placefile_layer.hpp>
+#include <scwx/qt/gl/draw/placefile_icons.hpp>
 #include <scwx/qt/manager/placefile_manager.hpp>
 #include <scwx/qt/manager/resource_manager.hpp>
 #include <scwx/qt/manager/settings_manager.hpp>
@@ -23,12 +24,18 @@ static const auto        logger_    = scwx::util::Logger::Create(logPrefix_);
 class PlacefileLayer::Impl
 {
 public:
-   explicit Impl() {};
+   explicit Impl(std::shared_ptr<MapContext> context) :
+       placefileIcons_ {std::make_shared<gl::draw::PlacefileIcons>(context)}
+   {
+   }
    ~Impl() = default;
 
+   void
+   RenderIconDrawItem(const QMapLibreGL::CustomLayerRenderParameters& params,
+                      const std::shared_ptr<gr::Placefile::IconDrawItem>& di);
    void
    RenderTextDrawItem(const QMapLibreGL::CustomLayerRenderParameters& params,
-                      std::shared_ptr<gr::Placefile::TextDrawItem>    di);
+                      const std::shared_ptr<gr::Placefile::TextDrawItem>& di);
 
    void RenderText(const QMapLibreGL::CustomLayerRenderParameters& params,
                    const std::string&                              text,
@@ -44,11 +51,14 @@ public:
    float         halfHeight_ {};
    bool          thresholded_ {true};
    ImFont*       monospaceFont_ {};
+
+   std::shared_ptr<gl::draw::PlacefileIcons> placefileIcons_;
 };
 
 PlacefileLayer::PlacefileLayer(std::shared_ptr<MapContext> context) :
-    DrawLayer(context), p(std::make_unique<PlacefileLayer::Impl>())
+    DrawLayer(context), p(std::make_unique<PlacefileLayer::Impl>(context))
 {
+   AddDrawItem(p->placefileIcons_);
 }
 
 PlacefileLayer::~PlacefileLayer() = default;
@@ -60,9 +70,25 @@ void PlacefileLayer::Initialize()
    DrawLayer::Initialize();
 }
 
+void PlacefileLayer::Impl::RenderIconDrawItem(
+   const QMapLibreGL::CustomLayerRenderParameters&     params,
+   const std::shared_ptr<gr::Placefile::IconDrawItem>& di)
+{
+   auto distance =
+      (thresholded_) ?
+         util::GeographicLib::GetDistance(
+            params.latitude, params.longitude, di->latitude_, di->longitude_) :
+         0;
+
+   if (distance < di->threshold_)
+   {
+      placefileIcons_->AddIcon(di);
+   }
+}
+
 void PlacefileLayer::Impl::RenderTextDrawItem(
-   const QMapLibreGL::CustomLayerRenderParameters& params,
-   std::shared_ptr<gr::Placefile::TextDrawItem>    di)
+   const QMapLibreGL::CustomLayerRenderParameters&     params,
+   const std::shared_ptr<gr::Placefile::TextDrawItem>& di)
 {
    auto distance =
       (thresholded_) ?
@@ -133,11 +159,12 @@ void PlacefileLayer::Render(
 {
    gl::OpenGLFunctions& gl = context()->gl();
 
-   DrawLayer::Render(params);
-
    // Reset text ID per frame
    p->textId_ = 0;
 
+   // Reset graphics
+   p->placefileIcons_->Reset();
+
    // Update map screen coordinate and scale information
    p->mapScreenCoordLocation_ = util::maplibre::LatLongToScreenCoordinate(
       {params.latitude, params.longitude});
@@ -171,6 +198,9 @@ void PlacefileLayer::Render(
       p->thresholded_ =
          placefileManager->placefile_thresholded(placefile->name());
 
+      p->placefileIcons_->SetIconFiles(placefile->icon_files(),
+                                       placefile->name());
+
       for (auto& drawItem : placefile->GetDrawItems())
       {
          switch (drawItem->itemType_)
@@ -181,12 +211,20 @@ void PlacefileLayer::Render(
                std::static_pointer_cast<gr::Placefile::TextDrawItem>(drawItem));
             break;
 
+         case gr::Placefile::ItemType::Icon:
+            p->RenderIconDrawItem(
+               params,
+               std::static_pointer_cast<gr::Placefile::IconDrawItem>(drawItem));
+            break;
+
          default:
             break;
          }
       }
    }
 
+   DrawLayer::Render(params);
+
    SCWX_GL_CHECK_ERROR();
 }