From b44c2d85bb8e46c4a6c65aacd23157c07cb80eca Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Fri, 12 Apr 2024 00:03:15 +0100
Subject: Create terrain vertices per surface type

---
 game/geoData.h   |  7 +++++++
 game/terrain.cpp | 24 ++++++++++++++++--------
 2 files changed, 23 insertions(+), 8 deletions(-)

(limited to 'game')

diff --git a/game/geoData.h b/game/geoData.h
index 7a2344d..5586023 100644
--- a/game/geoData.h
+++ b/game/geoData.h
@@ -150,6 +150,13 @@ public:
 		return std::tie(lowerExtent, upperExtent);
 	}
 
+	template<typename HandleT>
+	[[nodiscard]] auto
+	get_surface(const HandleT h)
+	{
+		return property(surface, h);
+	}
+
 protected:
 	template<glm::length_t Dim>
 	[[nodiscard]] Triangle<Dim>
diff --git a/game/terrain.cpp b/game/terrain.cpp
index 201c732..c19bd0a 100644
--- a/game/terrain.cpp
+++ b/game/terrain.cpp
@@ -27,18 +27,26 @@ Terrain::generateMeshes()
 	indices.reserve(geoData->n_faces() * 3);
 	std::vector<Vertex> vertices;
 	vertices.reserve(geoData->n_vertices());
-	std::map<GeoData::VertexHandle, size_t> vertexIndex;
-	std::transform(geoData->vertices_sbegin(), geoData->vertices_end(), std::back_inserter(vertices),
-			[this, &vertexIndex](const GeoData::VertexHandle v) {
-				vertexIndex.emplace(v, vertexIndex.size());
-				const auto p = geoData->point(v);
-				return Vertex {p, RelativePosition2D(p) / 10000.F, geoData->normal(v)};
+	std::map<std::pair<GeoData::VertexHandle, const Surface *>, size_t> vertexIndex;
+	std::for_each(geoData->vertices_sbegin(), geoData->vertices_end(),
+			[this, &vertexIndex, &vertices](const GeoData::VertexHandle v) {
+				std::for_each(geoData->vf_begin(v), geoData->vf_end(v),
+						[&vertexIndex, v, this, &vertices](const GeoData::FaceHandle f) {
+							if (const auto vertexIndexRef
+									= vertexIndex.emplace(std::make_pair(v, geoData->get_surface(f)), 0);
+									vertexIndexRef.second) {
+								vertexIndexRef.first->second = vertices.size();
+
+								const auto p = geoData->point(v);
+								vertices.emplace_back(p, RelativePosition2D(p) / 10000.F, geoData->normal(v));
+							}
+						});
 			});
 	std::for_each(
 			geoData->faces_sbegin(), geoData->faces_end(), [this, &vertexIndex, &indices](const GeoData::FaceHandle f) {
 				std::transform(geoData->fv_begin(f), geoData->fv_end(f), std::back_inserter(indices),
-						[&vertexIndex](const GeoData::VertexHandle v) {
-							return vertexIndex[v];
+						[&vertexIndex, f, this](const GeoData::VertexHandle v) {
+							return vertexIndex[std::make_pair(v, geoData->get_surface(f))];
 						});
 			});
 	meshes.create<Mesh>(vertices, indices);
-- 
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