refactoring: skydome visualization code extraction

openglskydome.h

@@ -0,0 +1,33 @@
+/*
+This Source Code Form is subject to the
+terms of the Mozilla Public License, v.
+2.0. If a copy of the MPL was not
+distributed with this file, You can
+obtain one at
+http://mozilla.org/MPL/2.0/.
+*/
+
+#pragma once
+
+#include "GL/glew.h"
+
+class opengl_skydome {
+
+public:
+// constructors
+    opengl_skydome() = default;
+// destructor
+    ~opengl_skydome();
+// methods
+    // updates data stores on the opengl end. NOTE: unbinds 
+    void update();
+    // draws the skydome
+    void render();
+
+private:
+// members
+    GLuint m_indexbuffer{ (GLuint)-1 }; // id of the buffer holding index data on the opengl end
+    std::size_t m_indexcount { 0 };
+    GLuint m_vertexbuffer{ (GLuint)-1 }; // id of the buffer holding vertex data on the opengl end
+    GLuint m_coloursbuffer{ (GLuint)-1 }; // id of the buffer holding colour data on the opengl end
+};