From c2aecdc0d6089a3c41b3d15c45cdb49fee6a45cc Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Mon, 7 Apr 2025 20:48:14 +0100
Subject: Add Asset interface to create an arbitrarily placed instance

InstanceProxy is returned out via a std::any containing a
std::shared_ptr because any can only contain copyable things.
---
 game/scenary/foliage.cpp           | 10 ++++++++++
 game/scenary/foliage.h             |  2 ++
 game/scenary/illuminator.cpp       | 10 ++++++++++
 game/scenary/illuminator.h         |  2 ++
 game/vehicles/railVehicleClass.cpp | 13 +++++++++++++
 game/vehicles/railVehicleClass.h   |  2 ++
 6 files changed, 39 insertions(+)

(limited to 'game')

diff --git a/game/scenary/foliage.cpp b/game/scenary/foliage.cpp
index 159a078..140c4e5 100644
--- a/game/scenary/foliage.cpp
+++ b/game/scenary/foliage.cpp
@@ -2,6 +2,16 @@
 #include "gfx/gl/sceneShader.h"
 #include "gfx/gl/shadowMapper.h"
 #include "gfx/gl/vertexArrayObject.h"
+#include <location.h>
+
+static_assert(std::is_constructible_v<Foliage>);
+
+std::any
+Foliage::createAt(const Location & position) const
+{
+	return std::make_shared<InstanceVertices<LocationVertex>::InstanceProxy>(
+			instances.acquire(position.getRotationTransform(), position.rot.y, position.pos));
+}
 
 bool
 Foliage::persist(Persistence::PersistenceStore & store)
diff --git a/game/scenary/foliage.h b/game/scenary/foliage.h
index 71bc734..d15a8b0 100644
--- a/game/scenary/foliage.h
+++ b/game/scenary/foliage.h
@@ -17,6 +17,8 @@ class Foliage : public Asset, public Renderable, public StdTypeDefs<Foliage> {
 	glVertexArray instancePointVAO;
 
 public:
+	[[nodiscard]] std::any createAt(const Location &) const override;
+
 	struct LocationVertex {
 		glm::mat3 rotation;
 		float yaw;
diff --git a/game/scenary/illuminator.cpp b/game/scenary/illuminator.cpp
index f1a02b2..d8e4c4e 100644
--- a/game/scenary/illuminator.cpp
+++ b/game/scenary/illuminator.cpp
@@ -2,6 +2,16 @@
 #include "gfx/gl/sceneShader.h"
 #include "gfx/gl/vertexArrayObject.h"
 #include "gfx/models/texture.h" // IWYU pragma: keep
+#include <location.h>
+
+static_assert(std::is_constructible_v<Illuminator>);
+
+std::any
+Illuminator::createAt(const Location & position) const
+{
+	return std::make_shared<InstanceVertices<LocationVertex>::InstanceProxy>(
+			instances.acquire(position.getRotationTransform(), position.pos));
+}
 
 bool
 Illuminator::SpotLight::persist(Persistence::PersistenceStore & store)
diff --git a/game/scenary/illuminator.h b/game/scenary/illuminator.h
index 47ce337..200ba40 100644
--- a/game/scenary/illuminator.h
+++ b/game/scenary/illuminator.h
@@ -15,6 +15,8 @@ class Illuminator : public Asset, public Renderable, public StdTypeDefs<Illumina
 	std::optional<glVertexArray> instancesSpotLightVAO, instancesPointLightVAO;
 
 public:
+	[[nodiscard]] std::any createAt(const Location &) const override;
+
 	struct LightCommonVertex {
 		RelativePosition3D position;
 		RGB colour;
diff --git a/game/vehicles/railVehicleClass.cpp b/game/vehicles/railVehicleClass.cpp
index 162a29a..21f01c8 100644
--- a/game/vehicles/railVehicleClass.cpp
+++ b/game/vehicles/railVehicleClass.cpp
@@ -17,6 +17,19 @@ RailVehicleClass::persist(Persistence::PersistenceStore & store)
 			&& STORE_HELPER(bodyMesh, Asset::MeshConstruct) && Asset::persist(store);
 }
 
+std::any
+RailVehicleClass::createAt(const Location & position) const
+{
+	return std::make_shared<InstanceVertices<LocationVertex>::InstanceProxy>(instances.acquire(LocationVertex {
+			.body = position.getRotationTransform(),
+			.front = position.getRotationTransform(),
+			.back = position.getRotationTransform(),
+			.bodyPos = position.pos,
+			.frontPos = {sincos(position.rot.x) * wheelBase * 0.5F, position.pos.z},
+			.backPos = {sincos(position.rot.x) * wheelBase * -0.5F, position.pos.z},
+	}));
+}
+
 void
 RailVehicleClass::postLoad()
 {
diff --git a/game/vehicles/railVehicleClass.h b/game/vehicles/railVehicleClass.h
index 6eb4ca5..ccff3e2 100644
--- a/game/vehicles/railVehicleClass.h
+++ b/game/vehicles/railVehicleClass.h
@@ -17,6 +17,8 @@ public:
 	void render(const SceneShader & shader, const Frustum &) const override;
 	void shadows(const ShadowMapper & shadowMapper, const Frustum &) const override;
 
+	[[nodiscard]] std::any createAt(const Location &) const override;
+
 	struct LocationVertex {
 		glm::mat3 body, front, back;
 		GlobalPosition3D bodyPos, frontPos, backPos;
-- 
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