From e118b1f5d8071460e3a9d4d731c6d69221f785dc Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Sat, 6 Mar 2021 19:44:58 +0000
Subject: Carve up the mess in game/vehicles

---
 game/vehicles/railVehicleClass.cpp | 80 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 80 insertions(+)
 create mode 100644 game/vehicles/railVehicleClass.cpp

(limited to 'game/vehicles/railVehicleClass.cpp')

diff --git a/game/vehicles/railVehicleClass.cpp b/game/vehicles/railVehicleClass.cpp
new file mode 100644
index 0000000..71890b8
--- /dev/null
+++ b/game/vehicles/railVehicleClass.cpp
@@ -0,0 +1,80 @@
+#include "railVehicleClass.h"
+#include "gfx/gl/shader.h"
+#include "gfx/models/mesh.h"
+#include "gfx/models/obj.h"
+#include "gfx/models/texture.h"
+#include <algorithm>
+#include <array>
+#include <cache.h>
+#include <filesystem>
+#include <glm/glm.hpp>
+#include <iterator>
+#include <lib/resource.h>
+#include <location.hpp>
+#include <map>
+#include <memory>
+#include <set>
+#include <string>
+#include <utility>
+#include <vector>
+
+RailVehicleClass::RailVehicleClass(const std::string & name) :
+	RailVehicleClass {std::make_unique<ObjParser>(Resource::mapPath(name + ".obj")),
+			Texture::cachedTexture.get(Resource::mapPath(name + ".png"))}
+{
+}
+
+RailVehicleClass::RailVehicleClass(std::unique_ptr<ObjParser> o, std::shared_ptr<Texture> t) : texture {std::move(t)}
+{
+	wheelBase = bogieOffset(*o);
+	length = objectLength(*o);
+	const auto m = o->createMeshes();
+	bodyMesh = m.at("Body");
+	bogies[0] = m.at("Bogie1");
+	bogies[1] = m.at("Bogie2");
+}
+
+void
+RailVehicleClass::render(const Shader & shader, const Location & location, const std::array<Location, 2> & bl) const
+{
+	texture->Bind();
+	for (auto b = 0U; b < bogies.size(); ++b) {
+		shader.setModel(bl[b]);
+		bogies[b]->Draw();
+	}
+	shader.setModel(location);
+	bodyMesh->Draw();
+}
+
+float
+RailVehicleClass::bogieOffset(ObjParser & o)
+{
+	float wheelBase {0};
+	// offset bogie positions so they can be set directly
+	for (auto & object : o.objects) { // bogie object index
+		if (!object.first.starts_with("Bogie")) {
+			continue;
+		}
+		std::set<std::pair<float, int>> vertexIds;
+		for (const auto & face : object.second) {
+			for (const auto & faceElement : face) {
+				vertexIds.emplace(o.vertices[faceElement.x - 1].z, faceElement.x - 1);
+			}
+		}
+		const auto offset = (vertexIds.begin()->first + vertexIds.rbegin()->first) / 2;
+		for (const auto & v : vertexIds) {
+			o.vertices[v.second].z -= offset;
+		}
+		wheelBase += std::abs(offset);
+	}
+	return wheelBase;
+}
+
+float
+RailVehicleClass::objectLength(ObjParser & o)
+{
+	const auto mme = std::minmax_element(o.vertices.begin(), o.vertices.end(), [](const auto & v1, const auto & v2) {
+		return v1.z < v2.z;
+	});
+	return mme.second->z - mme.first->z;
+}
-- 
cgit v1.2.3