From 1f5f646a4e5b4c0d34c8c65bbdec04a3ff15c85b Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Sun, 26 Jan 2025 18:33:10 +0200
Subject: [PATCH] Add a component for creating meshes via geometry definitions

---
 source/game/shape.cpp        | 27 ++++++++++++++++++++
 source/game/shape.h          | 49 ++++++++++++++++++++++++++++++++++++
 source/gameview/renderer.cpp | 16 ++++++++++++
 source/gameview/renderer.h   |  2 ++
 4 files changed, 94 insertions(+)
 create mode 100644 source/game/shape.cpp
 create mode 100644 source/game/shape.h

diff --git a/source/game/shape.cpp b/source/game/shape.cpp
new file mode 100644
index 0000000..ba17721
--- /dev/null
+++ b/source/game/shape.cpp
@@ -0,0 +1,27 @@
+#include "shape.h"
+#include <msp/geometry/loader.h>
+
+namespace Msp::Game {
+
+ShapeSetup::Loader::Loader(ShapeSetup &s):
+	ObjectLoader(s)
+{
+	static ActionMap shared_actions;
+	set_actions(shared_actions);
+}
+
+void ShapeSetup::Loader::init_actions()
+{
+	add("render_detail", &ShapeSetup::render_detail);
+	add("shape", &Loader::shape);
+	add("technique_name", &ShapeSetup::technique_name);
+}
+
+void ShapeSetup::Loader::shape()
+{
+	Geometry::Loader<float, 3> ldr;
+	load_sub_with(ldr);
+	obj.shape = ldr.take_shape();
+}
+
+} // namespace Msp::Game
diff --git a/source/game/shape.h b/source/game/shape.h
new file mode 100644
index 0000000..692cf0c
--- /dev/null
+++ b/source/game/shape.h
@@ -0,0 +1,49 @@
+#ifndef MSP_GAME_SHAPE_H_
+#define MSP_GAME_SHAPE_H_
+
+#include <memory>
+#include <msp/datafile/objectloader.h>
+#include <msp/geometry/shape.h>
+#include "component.h"
+#include "mspgame_api.h"
+
+namespace Msp::Game {
+
+// TODO Make this visible to the setup generator
+struct MSPGAME_API ShapeSetup
+{
+	class MSPGAME_API Loader: public DataFile::ObjectLoader<ShapeSetup>
+	{
+	public:
+		Loader(ShapeSetup &);
+
+	private:
+		void init_actions() override;
+
+		void shape();
+	};
+
+	std::unique_ptr<Geometry::Shape<float, 3>> shape;
+	std::string technique_name;
+	unsigned render_detail = 4;
+};
+
+class MSPGAME_API Shape: public Component
+{
+public:
+	using Setup = ShapeSetup;
+
+private:
+	const Setup &setup;
+
+public:
+	Shape(Handle<Entity> p, const Setup &s): Component(p), setup(s) { }
+
+	const Geometry::Shape<float, 3> *get_shape() const { return setup.shape.get(); }
+	const std::string &get_technique_name() const { return setup.technique_name; }
+	unsigned get_render_detail() const { return setup.render_detail; }
+};
+
+} // namespace Msp::Game
+
+#endif
diff --git a/source/gameview/renderer.cpp b/source/gameview/renderer.cpp
index b521ccb..0e71fc3 100644
--- a/source/gameview/renderer.cpp
+++ b/source/gameview/renderer.cpp
@@ -3,11 +3,13 @@
 #include <msp/game/light.h>
 #include <msp/game/meshsource.h>
 #include <msp/game/shadowtarget.h>
+#include <msp/game/shape.h>
 #include <msp/game/stage.h>
 #include <msp/game/transform.h>
 #include <msp/gl/colorcurve.h>
 #include <msp/gl/directionallight.h>
 #include <msp/gl/pointlight.h>
+#include <msp/gl/shape.h>
 #include "dynamicmeshsource.h"
 #include "lightemitter.h"
 #include "meshrenderer.h"
@@ -106,6 +108,18 @@ void Renderer::create_sequence()
 
 void Renderer::component_created(const Game::Events::ComponentCreated &event)
 {
+	Game::Handle<Game::Shape> shape = dynamic_handle_cast<Game::Shape>(event.component);
+	if(shape)
+	{
+		RenderedEntity &re = get_rendered_entity(event.component->get_entity());
+		if(!re.generated_mesh)
+		{
+			const GL::Technique &tech = stage.get_resources().get<GL::Technique>(shape->get_technique_name());
+			re.generated_mesh = Game::Owned<DynamicMeshSource>(re.entity, (GL::VERTEX3, GL::NORMAL3), tech);
+			GL::ShapeBuilder(*shape->get_shape(), shape->get_render_detail()).build(re.generated_mesh->get_mesh());
+		}
+	}
+
 	Game::Handle<Game::MeshSource> mesh_source = dynamic_handle_cast<Game::MeshSource>(event.component);
 	Game::Handle<DynamicMeshSource> dyn_mesh_src = dynamic_handle_cast<DynamicMeshSource>(event.component);
 	if(mesh_source || dyn_mesh_src)
@@ -149,6 +163,8 @@ void Renderer::component_destroyed(const Game::Events::ComponentDestroyed &event
 	auto i = lower_bound_member(entities, entity, &RenderedEntity::entity);
 	if(i!=entities.end() && i->entity==entity)
 	{
+		if(dynamic_handle_cast<Game::Shape>(event.component))
+			i->generated_mesh = nullptr;
 		if(dynamic_handle_cast<Game::MeshSource>(event.component))
 			i->mesh_renderer = nullptr;
 		if(auto light = dynamic_handle_cast<Game::Light>(event.component))
diff --git a/source/gameview/renderer.h b/source/gameview/renderer.h
index 04d2439..4657e35 100644
--- a/source/gameview/renderer.h
+++ b/source/gameview/renderer.h
@@ -20,6 +20,7 @@
 
 namespace Msp::GameView {
 
+class DynamicMeshSource;
 class LightEmitter;
 class MeshRenderer;
 
@@ -29,6 +30,7 @@ private:
 	struct RenderedEntity
 	{
 		Game::Handle<Game::Entity> entity;
+		Game::Owned<DynamicMeshSource> generated_mesh;
 		Game::Owned<MeshRenderer> mesh_renderer;
 		Game::Owned<LightEmitter> light_emitter;
 
-- 
2.45.2