Shared VAO for all 3 parts of RailVehicleClass

Rearranges its LocationVertex to be 3 repeated Parts. Adds helpers to
glvglVertexArray for useBuffer with various offsets. Render is then an
iteration of the meshes and the location data at the nth offset.

1 files changed, 7 insertions, 3 deletions

diff --git a/game/vehicles/railVehicleClass.h b/game/vehicles/railVehicleClass.h
index ccff3e2..fe27230 100644
--- a/game/vehicles/railVehicleClass.h
+++ b/game/vehicles/railVehicleClass.h
@@ -20,8 +20,12 @@ public:
 	[[nodiscard]] std::any createAt(const Location &) const override;
 
 	struct LocationVertex {
-		glm::mat3 body, front, back;
-		GlobalPosition3D bodyPos, frontPos, backPos;
+		struct Part {
+			glm::mat3 rotation;
+			GlobalPosition3D position;
+		};
+
+		Part body, front, back;
 	};
 
 	std::array<Mesh::Ptr, 2> bogies;
@@ -38,10 +42,10 @@ protected:
 	friend Persistence::SelectionPtrBase<std::shared_ptr<RailVehicleClass>>;
 	bool persist(Persistence::PersistenceStore & store) override;
 	void postLoad() override;
+	void renderAllParts(size_t count) const;
 
 private:
 	glVertexArray instanceVAO;
-	std::array<glVertexArray, 2> instancesBogiesVAO;
 };
 
 using RailVehicleClassPtr = std::shared_ptr<RailVehicleClass>;