5 files changed, 73 insertions, 31 deletions
diff --git a/game/network/network.cpp b/game/network/network.cpp
new file mode 100644
index 0000000..adda8fc
--- /dev/null
+++ b/game/network/network.cpp
@@ -0,0 +1,15 @@
+#include "network.h"
+#include <cache.h>
+#include <game/network/link.h>
+#include <gfx/models/texture.h>
+
+Network::Network(const std::string & tn) : texture {Texture::cachedTexture.get(tn)} { }
+
+NodePtr
+Network::findNodeAt(glm::vec3 pos) const
+{
+	if (const auto n = nodes.find(std::make_shared<Node>(pos)); n != nodes.end()) {
+		return *n;
+	}
+	return {};
+}
diff --git a/game/network/network.h b/game/network/network.h
new file mode 100644
index 0000000..2c24916
--- /dev/null
+++ b/game/network/network.h
@@ -0,0 +1,38 @@
+#ifndef NETWORK_H
+#define NETWORK_H
+
+#include "link.h"
+#include <collection.hpp>
+#include <gfx/renderable.h>
+#include <glm/glm.hpp>
+#include <memory>
+#include <set>
+#include <sorting.hpp>
+#include <string>
+
+class Texture;
+class Shader;
+
+class Network {
+public:
+	explicit Network(const std::string & textureName);
+
+	[[nodiscard]] NodePtr findNodeAt(glm::vec3) const;
+
+protected:
+	using Nodes = std::set<NodePtr, PtrSorter<NodePtr>>;
+	Nodes nodes;
+	std::shared_ptr<Texture> texture;
+};
+
+template<typename T> class NetworkOf : public Network, public Renderable {
+protected:
+	using Network::Network;
+
+	Collection<T> links;
+
+public:
+	void render(const Shader &) const override;
+};
+
+#endif
diff --git a/game/network/network.impl.h b/game/network/network.impl.h
new file mode 100644
index 0000000..ddb1ae5
--- /dev/null
+++ b/game/network/network.impl.h
@@ -0,0 +1,12 @@
+#include "network.h"
+#include <gfx/gl/shader.h>
+#include <gfx/models/texture.h>
+
+template<typename T>
+void
+NetworkOf<T>::render(const Shader & shader) const
+{
+	shader.setModel(Location {}, Shader::Program::StaticPos);
+	texture->Bind();
+	links.apply(&T::render, shader);
+}
diff --git a/game/network/rail.cpp b/game/network/rail.cpp
index 8ec6893..133b80c 100644
--- a/game/network/rail.cpp
+++ b/game/network/rail.cpp
@@ -1,11 +1,10 @@
 #include "rail.h"
-#include "game/network/link.h"
+#include "network.h"
 #include <GL/glew.h>
 #include <array>
-#include <cache.h>
 #include <cassert>
-#include <gfx/gl/shader.h>
-#include <gfx/models/texture.h>
+#include <game/network/link.h>
+#include <game/network/network.impl.h> // IWYU pragma: keep
 #include <gfx/models/vertex.hpp>
 #include <glm/gtx/transform.hpp>
 #include <initializer_list>
@@ -14,10 +13,12 @@
 #include <stdexcept>
 #include <utility>
 
+template class NetworkOf<RailLink>;
+
 constexpr auto RAIL_CROSSSECTION_VERTICES {5U};
 constexpr glm::vec3 RAIL_HEIGHT {0, .25F, 0};
 
-RailLinks::RailLinks() : texture {Texture::cachedTexture.get("rails.jpg")} { }
+RailLinks::RailLinks() : NetworkOf<RailLink> {"rails.jpg"} { }
 void RailLinks::tick(TickDuration) { }
 
 void
@@ -37,15 +38,6 @@ RailLinks::joinLinks(const LinkPtr & l) const
 	}
 }
 
-NodePtr
-RailLinks::findNodeAt(glm::vec3 pos) const
-{
-	if (const auto n = nodes.find(std::make_shared<Node>(pos)); n != nodes.end()) {
-		return *n;
-	}
-	return {};
-}
-
 std::shared_ptr<RailLink>
 RailLinks::addLinksBetween(glm::vec3 start, glm::vec3 end)
 {
@@ -111,14 +103,6 @@ RailLinks::addLinksBetween(glm::vec3 start, glm::vec3 end)
 }
 
 void
-RailLinks::render(const Shader & shader) const
-{
-	shader.setModel(Location {}, Shader::Program::StaticPos);
-	texture->Bind();
-	links.apply(&RailLink::render, shader);
-}
-
-void
 RailLink::defaultMesh()
 {
 	for (auto n = RAIL_CROSSSECTION_VERTICES; n < vertices.size(); n += 1) {
diff --git a/game/network/rail.h b/game/network/rail.h
index 4460fcd..1d0ef68 100644
--- a/game/network/rail.h
+++ b/game/network/rail.h
@@ -7,17 +7,16 @@
 #include "gfx/models/vertex.hpp"
 #include "gfx/renderable.h"
 #include "link.h"
+#include "network.h"
 #include <glm/glm.hpp>
 #include <location.hpp>
 #include <maths.h>
 #include <memory>
 #include <set>
-#include <sorting.hpp>
 #include <utility>
 #include <vector>
 
 class Shader;
-class Texture;
 
 // A piece of rail track
 class RailLink : public Link, public Renderable {
@@ -57,7 +56,7 @@ private:
 
 template<typename T> concept RailLinkConcept = std::is_base_of_v<RailLink, T>;
 
-class RailLinks : public Renderable, public WorldObject {
+class RailLinks : public NetworkOf<RailLink>, public WorldObject {
 public:
 	RailLinks();
 	template<RailLinkConcept T, typename... Params>
@@ -72,16 +71,10 @@ public:
 	}
 
 	std::shared_ptr<RailLink> addLinksBetween(glm::vec3 start, glm::vec3 end);
-	[[nodiscard]] NodePtr findNodeAt(glm::vec3) const;
 
 private:
-	using Nodes = std::set<NodePtr, PtrSorter<NodePtr>>;
-	Collection<RailLink> links;
-	Nodes nodes;
-	void render(const Shader &) const override;
 	void tick(TickDuration elapsed) override;
 	void joinLinks(const LinkPtr &) const;
-	std::shared_ptr<Texture> texture;
 };
 
 #endif