Draw a radial. This needs some cleanup, and some MVP matrix tweaking.

scwx-qt/gl/radar.frag

@@ -0,0 +1,13 @@
+#version 330 core
+
+// Lower the default precision to medium
+precision mediump float;
+
+uniform sampler2D uTexture;
+
+in vec2 texCoord;
+
+void main()
+{
+   gl_FragColor = vec4(1.0f, 0.0f, 0.0f, 1.0f);
+}

scwx-qt/gl/radar.vert

@@ -0,0 +1,17 @@
+#version 330 core
+
+layout (location = 0) in vec2 aPosition;
+layout (location = 1) in vec2 aTexCoord;
+
+uniform mat4 uMVPMatrix;
+
+out vec2 texCoord;
+
+void main()
+{
+   // Pass the texture coordinate to the fragment shader
+   texCoord = aTexCoord;
+
+   // Transform the position to screen coordinates
+   gl_Position = uMVPMatrix * vec4(aPosition, 0.0f, 1.0f);
+}

scwx-qt/scwx-qt.cmake

@@ -12,6 +12,7 @@ set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
 find_package(Boost)
+find_package(glm)
 
 # QtCreator supports the following variables for Android, which are identical to qmake Android variables.
 # Check https://doc.qt.io/qt/deployment-android.html for more information.
@@ -50,9 +51,18 @@ set(SRC_MAIN source/scwx/qt/main/main.cpp
              source/scwx/qt/main/main_window.cpp)
 set(UI_MAIN  source/scwx/qt/main/main_window.ui)
 set(HDR_MAP source/scwx/qt/map/map_widget.hpp
+            source/scwx/qt/map/radar_layer.hpp
             source/scwx/qt/map/triangle_layer.hpp)
 set(SRC_MAP source/scwx/qt/map/map_widget.cpp
+            source/scwx/qt/map/radar_layer.cpp
             source/scwx/qt/map/triangle_layer.cpp)
+set(HDR_UTIL source/scwx/qt/util/shader_program.hpp)
+set(SRC_UTIL source/scwx/qt/util/shader_program.cpp)
+
+set(RESOURCE_FILES scwx-qt.qrc)
+
+set(SHADER_FILES gl/radar.frag
+                 gl/radar.vert)
 
 set(TS_FILES ts/scwx_en_US.ts)
 
@@ -61,6 +71,10 @@ set(PROJECT_SOURCES ${HDR_MAIN}
                     ${UI_MAIN}
                     ${HDR_MAP}
                     ${SRC_MAP}
+                    ${HDR_UTIL}
+                    ${SRC_UTIL}
+                    ${SHADER_FILES}
+                    ${RESOURCE_FILES}
                     ${TS_FILES})
 
 source_group("Header Files\\main" FILES ${HDR_MAIN})
@@ -68,6 +82,10 @@ source_group("Source Files\\main" FILES ${SRC_MAIN})
 source_group("UI Files\\main"     FILES ${UI_MAIN})
 source_group("Header Files\\map"  FILES ${HDR_MAP})
 source_group("Source Files\\map"  FILES ${SRC_MAP})
+source_group("Header Files\\util" FILES ${HDR_UTIL})
+source_group("Source Files\\util" FILES ${SRC_UTIL})
+source_group("OpenGL Shaders"     FILES ${SHADER_FILES})
+source_group("Resources"          FILES ${RESOURCE_FILES})
 source_group("I18N Files"         FILES ${TS_FILES})
 
 qt_add_executable(scwx-qt
@@ -82,4 +100,5 @@ target_link_libraries(scwx-qt PRIVATE Qt${QT_VERSION_MAJOR}::Widgets
                                       Qt${QT_VERSION_MAJOR}::OpenGLWidgets
                                       Boost::log
                                       qmapboxgl
-                                      opengl32)
+                                      opengl32
+                                      glm::glm)

scwx-qt/scwx-qt.qrc

@@ -0,0 +1,6 @@
+<RCC>
+    <qresource prefix="/">
+        <file>gl/radar.frag</file>
+        <file>gl/radar.vert</file>
+    </qresource>
+</RCC>

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

@@ -1,6 +1,6 @@
 #include "map_widget.hpp"
 
-#include <scwx/qt/map/triangle_layer.hpp>
+#include <scwx/qt/map/radar_layer.hpp>
 
 #include <QApplication>
 #include <QColor>
@@ -65,7 +65,7 @@ void MapWidget::changeStyle()
 void MapWidget::AddLayers()
 {
    // QMapboxGL::addCustomLayer will take ownership of the QScopedPointer
-   QScopedPointer<QMapbox::CustomLayerHostInterface> pHost(new TriangleLayer());
+   QScopedPointer<QMapbox::CustomLayerHostInterface> pHost(new RadarLayer());
 
    QString before = "ferry";
 
@@ -80,7 +80,7 @@ void MapWidget::AddLayers()
       }
    }
 
-   map_->addCustomLayer("triangle", pHost, before);
+   map_->addCustomLayer("radar", pHost, before);
 }
 
 void MapWidget::keyPressEvent(QKeyEvent* ev)

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

@@ -0,0 +1,215 @@
+#define _USE_MATH_DEFINES
+
+#include <scwx/qt/map/radar_layer.hpp>
+#include <scwx/qt/util/shader_program.hpp>
+
+#include <QOpenGLFunctions_3_3_Core>
+
+#include <boost/log/trivial.hpp>
+
+#include <glm/glm.hpp>
+#include <glm/gtc/matrix_transform.hpp>
+#include <glm/gtc/type_ptr.hpp>
+
+namespace scwx
+{
+namespace qt
+{
+
+static const std::string logPrefix_ = "[scwx::qt::map::radar_layer] ";
+
+class RadarLayerImpl
+{
+public:
+   explicit RadarLayerImpl() :
+       gl_(),
+       shaderProgram_(),
+       uMVPMatrixLocation_(GL_INVALID_INDEX),
+       vbo_ {GL_INVALID_INDEX},
+       vao_ {GL_INVALID_INDEX},
+       numVertices_ {0}
+   {
+      gl_.initializeOpenGLFunctions();
+   }
+   ~RadarLayerImpl() = default;
+
+   QOpenGLFunctions_3_3_Core gl_;
+
+   ShaderProgram shaderProgram_;
+   GLint         uMVPMatrixLocation_;
+   GLuint        vbo_;
+   GLuint        vao_;
+
+   GLsizeiptr numVertices_;
+};
+
+RadarLayer::RadarLayer() : p(std::make_unique<RadarLayerImpl>()) {}
+RadarLayer::~RadarLayer() = default;
+
+RadarLayer::RadarLayer(RadarLayer&&) noexcept = default;
+RadarLayer& RadarLayer::operator=(RadarLayer&&) noexcept = default;
+
+void RadarLayer::initialize()
+{
+   BOOST_LOG_TRIVIAL(debug) << logPrefix_ << "initialize()";
+
+   QOpenGLFunctions_3_3_Core& gl = p->gl_;
+
+   p->shaderProgram_.Load(":/gl/radar.vert", ":/gl/radar.frag");
+
+   p->uMVPMatrixLocation_ =
+      gl.glGetUniformLocation(p->shaderProgram_.id(), "uMVPMatrix");
+   if (p->uMVPMatrixLocation_ == -1)
+   {
+      BOOST_LOG_TRIVIAL(warning) << logPrefix_ << "Could not find uMVPMatrix";
+   }
+   constexpr uint16_t MAX_RADIALS           = 720;
+   constexpr uint16_t MAX_DATA_MOMENT_GATES = 1840;
+
+   static std::array<GLfloat, MAX_RADIALS * MAX_DATA_MOMENT_GATES * 6 * 2>
+      vertices;
+
+   constexpr float angleDelta = 0.5f * static_cast<float>(M_PI) / 180.0f;
+
+   float angle1 = 0;
+   float angle2 = angleDelta;
+
+   GLsizeiptr index = 0;
+
+   for (uint16_t azimuth = 0; azimuth < 720; ++azimuth)
+   {
+      const float dataMomentRange     = 2.125f;
+      const float dataMomentInterval  = 0.25f;
+      const float dataMomentIntervalH = dataMomentInterval * 0.5f;
+      const float snrThreshold        = 2.0f;
+
+      const uint16_t numberOfDataMomentGates = 1832;
+
+      float range1 = dataMomentRange - dataMomentIntervalH;
+      float range2 = range1 + dataMomentInterval;
+
+      float sinTheta1 = std::sinf(angle1);
+      float sinTheta2 = std::sinf(angle2);
+      float cosTheta1 = std::cosf(angle1);
+      float cosTheta2 = std::cosf(angle2);
+
+      for (uint16_t gate = 0; gate < numberOfDataMomentGates; ++gate)
+      {
+         float r1SinTheta1 = range1 * sinTheta1;
+         float r1SinTheta2 = range1 * sinTheta2;
+         float r2SinTheta1 = range2 * sinTheta1;
+         float r2SinTheta2 = range2 * sinTheta2;
+
+         float r1CosTheta1 = range1 * cosTheta1;
+         float r1CosTheta2 = range1 * cosTheta2;
+         float r2CosTheta1 = range2 * cosTheta1;
+         float r2CosTheta2 = range2 * cosTheta2;
+
+         vertices[index++] = r1SinTheta1;
+         vertices[index++] = r1CosTheta1;
+
+         vertices[index++] = r2SinTheta1;
+         vertices[index++] = r2CosTheta1;
+
+         vertices[index++] = r1SinTheta2;
+         vertices[index++] = r1CosTheta2;
+
+         vertices[index++] = r1SinTheta2;
+         vertices[index++] = r1CosTheta2;
+
+         vertices[index++] = r2SinTheta2;
+         vertices[index++] = r2CosTheta2;
+
+         vertices[index++] = r2SinTheta1;
+         vertices[index++] = r2CosTheta1;
+
+         range1 += dataMomentInterval;
+         range2 += dataMomentInterval;
+      }
+
+      angle1 += angleDelta;
+      angle2 += angleDelta;
+      break;
+   }
+
+   // Generate a vertex buffer object
+   gl.glGenBuffers(1, &p->vbo_);
+
+   // Generate a vertex array object
+   gl.glGenVertexArrays(1, &p->vao_);
+
+   // Bind vertex array object
+   gl.glBindVertexArray(p->vao_);
+
+   // Copy vertices array in a buffer for OpenGL to use
+   gl.glBindBuffer(GL_ARRAY_BUFFER, p->vbo_);
+   gl.glBufferData(GL_ARRAY_BUFFER,
+                   index * sizeof(GLfloat),
+                   vertices.data(),
+                   GL_STATIC_DRAW);
+
+   // Set the vertex attributes pointers
+   gl.glVertexAttribPointer(
+      0, 2, GL_FLOAT, GL_FALSE, 2 * sizeof(GLfloat), static_cast<void*>(0));
+   gl.glEnableVertexAttribArray(0);
+
+   p->numVertices_ = index;
+}
+
+void RadarLayer::render(const QMapbox::CustomLayerRenderParameters& params)
+{
+   QOpenGLFunctions_3_3_Core& gl = p->gl_;
+
+   p->shaderProgram_.Use();
+
+   float metersPerPixel =
+      QMapbox::metersPerPixelAtLatitude(params.latitude, params.zoom);
+
+   const float scale  = 1000.0f / metersPerPixel * 2.0f;
+   const float xScale = scale / params.width;
+   const float yScale = scale / params.height;
+
+   const QMapbox::Coordinate radar(38.6986, -90.6828);
+
+   const QMapbox::ProjectedMeters radarMeters =
+      QMapbox::projectedMetersForCoordinate(radar);
+   const QMapbox::ProjectedMeters mapMeters =
+      QMapbox::projectedMetersForCoordinate(
+         {params.latitude, params.longitude});
+
+   const float yTranslate = (radarMeters.first - mapMeters.first) * 0.001f;
+   const float xTranslate = (radarMeters.second - mapMeters.second) * 0.001f;
+
+   glm::mat4 uMVPMatrix(1.0f);
+   uMVPMatrix = glm::scale(uMVPMatrix, glm::vec3(xScale, yScale, 1.0f));
+   uMVPMatrix =
+      glm::translate(uMVPMatrix, glm::vec3(xTranslate, yTranslate, 0.0f));
+   uMVPMatrix = glm::rotate(uMVPMatrix,
+                            glm::radians<float>(params.bearing),
+                            glm::vec3(0.0f, 0.0f, 1.0f));
+
+   gl.glUniformMatrix4fv(
+      p->uMVPMatrixLocation_, 1, GL_FALSE, glm::value_ptr(uMVPMatrix));
+
+   gl.glBindVertexArray(p->vao_);
+   gl.glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
+   gl.glDrawArrays(GL_TRIANGLES, 0, p->numVertices_);
+   gl.glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
+}
+
+void RadarLayer::deinitialize()
+{
+   QOpenGLFunctions_3_3_Core& gl = p->gl_;
+
+   BOOST_LOG_TRIVIAL(debug) << logPrefix_ << "deinitialize()";
+
+   gl.glDeleteVertexArrays(1, &p->vao_);
+   gl.glDeleteBuffers(1, &p->vbo_);
+
+   p->uMVPMatrixLocation_ = GL_INVALID_INDEX;
+   p->vao_                = GL_INVALID_INDEX;
+   p->vbo_                = GL_INVALID_INDEX;
+}
+
+} // namespace qt
+} // namespace scwx

scwx-qt/source/scwx/qt/map/radar_layer.hpp

@@ -0,0 +1,31 @@
+#include <qmapboxgl.hpp>
+
+namespace scwx
+{
+namespace qt
+{
+
+class RadarLayerImpl;
+
+class RadarLayer : public QMapbox::CustomLayerHostInterface
+{
+public:
+   explicit RadarLayer();
+   ~RadarLayer();
+
+   RadarLayer(const RadarLayer&) = delete;
+   RadarLayer& operator=(const RadarLayer&) = delete;
+
+   RadarLayer(RadarLayer&&) noexcept;
+   RadarLayer& operator=(RadarLayer&&) noexcept;
+
+   void initialize() override final;
+   void render(const QMapbox::CustomLayerRenderParameters&) override final;
+   void deinitialize() override final;
+
+private:
+   std::unique_ptr<RadarLayerImpl> p;
+};
+
+} // namespace qt
+} // namespace scwx

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

@@ -0,0 +1,158 @@
+#include <scwx/qt/util/shader_program.hpp>
+
+#include <QFile>
+#include <QOpenGLFunctions_3_3_Core>
+
+#include <boost/log/trivial.hpp>
+
+namespace scwx
+{
+namespace qt
+{
+
+static const std::string logPrefix_ = "[scwx::qt::util::shader_program] ";
+
+class ShaderProgramImpl
+{
+public:
+   explicit ShaderProgramImpl() : gl_(), id_ {GL_INVALID_INDEX}
+   {
+      gl_.initializeOpenGLFunctions();
+
+      // Create shader program
+      id_ = gl_.glCreateProgram();
+   }
+
+   ~ShaderProgramImpl()
+   {
+      // Delete shader program
+      gl_.glDeleteProgram(id_);
+   }
+
+   QOpenGLFunctions_3_3_Core gl_;
+
+   GLuint id_;
+};
+
+ShaderProgram::ShaderProgram() : p(std::make_unique<ShaderProgramImpl>()) {}
+ShaderProgram::~ShaderProgram() = default;
+
+ShaderProgram::ShaderProgram(ShaderProgram&&) noexcept = default;
+ShaderProgram& ShaderProgram::operator=(ShaderProgram&&) noexcept = default;
+
+GLuint ShaderProgram::id() const
+{
+   return p->id_;
+}
+
+bool ShaderProgram::Load(const std::string& vertexPath,
+                         const std::string& fragmentPath)
+{
+   BOOST_LOG_TRIVIAL(debug) << logPrefix_ << "Load()";
+
+   QOpenGLFunctions_3_3_Core& gl = p->gl_;
+
+   GLint glSuccess;
+   bool  success = true;
+
+   QFile vertexFile(vertexPath.c_str());
+   QFile fragmentFile(fragmentPath.c_str());
+
+   vertexFile.open(QIODevice::ReadOnly | QIODevice::Text);
+   fragmentFile.open(QIODevice::ReadOnly | QIODevice::Text);
+
+   if (!vertexFile.isOpen())
+   {
+      BOOST_LOG_TRIVIAL(error)
+         << logPrefix_ << "Could not load vertex shader: " << vertexPath;
+      return false;
+   }
+
+   if (!fragmentFile.isOpen())
+   {
+      BOOST_LOG_TRIVIAL(error)
+         << logPrefix_ << "Could not load fragment shader: " << fragmentPath;
+      return false;
+   }
+
+   QTextStream vertexShaderStream(&vertexFile);
+   QTextStream fragmentShaderStream(&fragmentFile);
+
+   vertexShaderStream.setEncoding(QStringConverter::Utf8);
+   fragmentShaderStream.setEncoding(QStringConverter::Utf8);
+
+   std::string vertexShaderSource = vertexShaderStream.readAll().toStdString();
+   std::string fragmentShaderSource =
+      fragmentShaderStream.readAll().toStdString();
+
+   const char* vertexShaderSourceC   = vertexShaderSource.c_str();
+   const char* fragmentShaderSourceC = fragmentShaderSource.c_str();
+
+   // Create a vertex shader
+   GLuint vertexShader = gl.glCreateShader(GL_VERTEX_SHADER);
+
+   // Attach the shader source code and compile the shader
+   gl.glShaderSource(vertexShader, 1, &vertexShaderSourceC, NULL);
+   gl.glCompileShader(vertexShader);
+
+   // Check for errors
+   gl.glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &glSuccess);
+   if (!glSuccess)
+   {
+      char infoLog[512];
+      gl.glGetShaderInfoLog(vertexShader, 512, NULL, infoLog);
+      BOOST_LOG_TRIVIAL(error)
+         << logPrefix_ << "Vertex shader compilation failed";
+      success = false;
+   }
+
+   // Create a fragment shader
+   GLuint fragmentShader = gl.glCreateShader(GL_FRAGMENT_SHADER);
+
+   // Attach the shader source and compile the shader
+   gl.glShaderSource(fragmentShader, 1, &fragmentShaderSourceC, NULL);
+   gl.glCompileShader(fragmentShader);
+
+   // Check for errors
+   gl.glGetShaderiv(fragmentShader, GL_COMPILE_STATUS, &glSuccess);
+   if (!glSuccess)
+   {
+      char infoLog[512];
+      gl.glGetShaderInfoLog(fragmentShader, 512, NULL, infoLog);
+      BOOST_LOG_TRIVIAL(error)
+         << logPrefix_ << "Fragment shader compilation failed: " << infoLog;
+      success = false;
+   }
+
+   if (success)
+   {
+      gl.glAttachShader(p->id_, vertexShader);
+      gl.glAttachShader(p->id_, fragmentShader);
+      gl.glLinkProgram(p->id_);
+
+      // Check for errors
+      gl.glGetProgramiv(p->id_, GL_LINK_STATUS, &glSuccess);
+      if (!glSuccess)
+      {
+         char infoLog[512];
+         gl.glGetProgramInfoLog(p->id_, 512, NULL, infoLog);
+         BOOST_LOG_TRIVIAL(error)
+            << logPrefix_ << "Shader program link failed: " << infoLog;
+         success = false;
+      }
+   }
+
+   // Delete shaders
+   gl.glDeleteShader(vertexShader);
+   gl.glDeleteShader(fragmentShader);
+
+   return false;
+}
+
+void ShaderProgram::Use() const
+{
+   p->gl_.glUseProgram(p->id_);
+}
+
+} // namespace qt
+} // namespace scwx

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

@@ -0,0 +1,42 @@
+#pragma once
+
+#ifdef _WIN32
+#include <Windows.h>
+#endif
+
+#include <memory>
+#include <string>
+
+#include <GL/gl.h>
+
+namespace scwx
+{
+namespace qt
+{
+
+class ShaderProgramImpl;
+
+class ShaderProgram
+{
+public:
+   explicit ShaderProgram();
+   ~ShaderProgram();
+
+   ShaderProgram(const ShaderProgram&) = delete;
+   ShaderProgram& operator=(const ShaderProgram&) = delete;
+
+   ShaderProgram(ShaderProgram&&) noexcept;
+   ShaderProgram& operator=(ShaderProgram&&) noexcept;
+
+   GLuint id() const;
+
+   bool Load(const std::string& vertexPath, const std::string& fragmentPath);
+
+   void Use() const;
+
+private:
+   std::unique_ptr<ShaderProgramImpl> p;
+};
+
+} // namespace qt
+} // namespace scwx