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

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