From 20308e0a8d62e575237310b7de919e9c7410a9d7 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Sun, 22 Dec 2024 12:41:37 +0000
Subject: Store a generation number for GeoData

---
 game/geoData.cpp | 9 +++++++++
 game/geoData.h   | 2 ++
 2 files changed, 11 insertions(+)

(limited to 'game')

diff --git a/game/geoData.cpp b/game/geoData.cpp
index d15a51b..5771a2f 100644
--- a/game/geoData.cpp
+++ b/game/geoData.cpp
@@ -66,6 +66,7 @@ GeoData::loadFromAsciiGrid(const std::filesystem::path & input)
 			});
 		}
 	}
+	mesh.generation++;
 	mesh.updateAllVertexNormals();
 
 	return mesh;
@@ -106,6 +107,7 @@ GeoData::createFlat(GlobalPosition2D lower, GlobalPosition2D upper, GlobalDistan
 	}
 
 	mesh.updateAllVertexNormals();
+	mesh.generation++;
 
 	return mesh;
 }
@@ -601,6 +603,13 @@ GeoData::setHeights(const std::span<const GlobalPosition3D> triangleStrip, const
 	surfaceStripWalk(surfaceStripWalk, findPoint(strip.front().centroid()));
 
 	updateAllVertexNormals(newOrChangedVerts);
+	generation++;
+}
+
+size_t
+GeoData::getGeneration() const
+{
+	return generation;
 }
 
 void
diff --git a/game/geoData.h b/game/geoData.h
index 01582a6..8eda99a 100644
--- a/game/geoData.h
+++ b/game/geoData.h
@@ -84,6 +84,7 @@ public:
 	};
 
 	void setHeights(std::span<const GlobalPosition3D> triangleStrip, const SetHeightsOpts &);
+	[[nodiscard]] size_t getGeneration() const;
 
 	[[nodiscard]] auto
 	getExtents() const
@@ -128,4 +129,5 @@ protected:
 
 private:
 	GlobalPosition3D lowerExtent {}, upperExtent {};
+	size_t generation {};
 };
-- 
cgit v1.2.3