Reorganize source files into logical subdirectories

Co-authored-by: Hirek193 <23196899+Hirek193@users.noreply.github.com>

rendering/opengl33particles.h

@@ -0,0 +1,54 @@
+/*
+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/buffer.h"
+#include "gl/vao.h"
+#include "gl/shader.h"
+
+class opengl_camera;
+
+// particle data visualizer
+class opengl33_particles {
+public:
+// constructors
+	opengl33_particles() = default;
+
+// methods
+	void
+	    update( opengl_camera const &Camera );
+    std::size_t
+	    render( );
+private:
+// types
+	struct particle_vertex {
+		glm::vec3 position; // 3d space
+		glm::vec4 color; // rgba, unsigned byte format
+		glm::vec2 texture; // uv space
+	};
+/*
+	using sourcedistance_pair = std::pair<smoke_source *, float>;
+	using source_sequence = std::vector<sourcedistance_pair>;
+*/
+	using particlevertex_sequence = std::vector<particle_vertex>;
+// methods
+// members
+/*
+	source_sequence m_sources; // list of particle sources visible in current render pass, with their respective distances to the camera
+*/
+	particlevertex_sequence m_particlevertices; // geometry data of visible particles, generated on the cpu end
+	std::optional<gl::buffer> m_buffer;
+	std::optional<gl::vao> m_vao;
+	std::unique_ptr<gl::program> m_shader;
+
+	std::size_t m_buffercapacity{ 0 }; // total capacity of the last established buffer
+};
+
+//---------------------------------------------------------------------------