9 files changed, 340 insertions, 24 deletions

diff --git a/src/example/CMakeLists.txt b/src/example/CMakeLists.txt
index 6df4ce7..fea6f60 100644
--- a/src/example/CMakeLists.txt
+++ b/src/example/CMakeLists.txt
@@ -1,3 +1,6 @@
+# all examples
+add_custom_target(examples)
+
 # add_example(target_name [SOURCES...])
 function(add_example target_name)
 	# if SOURCES is not specified
@@ -10,9 +13,14 @@ function(add_example target_name)
 
 	add_executable(${target_name} EXCLUDE_FROM_ALL ${sources})
 	target_link_libraries(${target_name} PUBLIC crepe)
+	add_dependencies(examples ${target_name})
 endfunction()
 
 add_example(audio_internal)
-add_example(components_internal)
+# add_example(components_internal)
 add_example(script)
-
+add_example(log)
+add_example(rendering)
+add_example(asset_manager)
+add_example(particle)
+add_example(physics)
diff --git a/src/example/asset_manager.cpp b/src/example/asset_manager.cpp
new file mode 100644
index 0000000..7e15d1f
--- /dev/null
+++ b/src/example/asset_manager.cpp
@@ -0,0 +1,39 @@
+
+
+#include <crepe/Sound.h>
+#include <crepe/api/AssetManager.h>
+#include <crepe/api/Texture.h>
+
+using namespace crepe;
+using namespace crepe::api;
+int main() {
+
+	// this needs to be called before the asset manager otherwise the destructor
+	// of sdl is not in the right order
+	{ Texture test("../asset/texture/img.png"); }
+	// FIXME: make it so the issue described by the above comment is not possible
+	// (i.e. the order in which internal classes are instantiated should not
+	// impact the way the engine works).
+
+	auto & mgr = AssetManager::get_instance();
+
+	{
+		// TODO: [design] the Sound class can't be directly included by the user as
+		// it includes SoLoud headers.
+		auto bgm = mgr.cache<Sound>("../mwe/audio/bgm.ogg");
+		auto sfx1 = mgr.cache<Sound>("../mwe/audio/sfx1.wav");
+		auto sfx2 = mgr.cache<Sound>("../mwe/audio/sfx2.wav");
+
+		auto img = mgr.cache<Texture>("../asset/texture/img.png");
+		auto img1 = mgr.cache<Texture>("../asset/texture/second.png");
+	}
+
+	{
+		auto bgm = mgr.cache<Sound>("../mwe/audio/bgm.ogg");
+		auto sfx1 = mgr.cache<Sound>("../mwe/audio/sfx1.wav");
+		auto sfx2 = mgr.cache<Sound>("../mwe/audio/sfx2.wav");
+
+		auto img = mgr.cache<Texture>("../asset/texture/img.png");
+		auto img1 = mgr.cache<Texture>("../asset/texture/second.png");
+	}
+}
diff --git a/src/example/audio_internal.cpp b/src/example/audio_internal.cpp
index 1199e2d..f35ad9d 100644
--- a/src/example/audio_internal.cpp
+++ b/src/example/audio_internal.cpp
@@ -5,26 +5,40 @@
 
 #include <crepe/Sound.h>
 #include <crepe/util/log.h>
+#include <crepe/api/Config.h>
 
-#include <chrono>
 #include <thread>
 
 using namespace crepe;
+using namespace crepe::api;
 using namespace std;
 using namespace std::chrono_literals;
 using std::make_unique;
 
-int main() {
-	dbg_trace();
+// Unrelated stuff that is not part of this POC
+int _ = [] () {
+	// Show dbg_trace() output
+	auto & cfg = api::Config::get_instance();
+	cfg.log.level = util::LogLevel::TRACE;
+
+	return 0; // satisfy compiler
+}();
+
 
+
+int main() {
+	// Load a background track (Ogg Vorbis)
 	auto bgm = Sound("../mwe/audio/bgm.ogg");
+	// Load three short samples (WAV)
 	auto sfx1 = Sound("../mwe/audio/sfx1.wav");
 	auto sfx2 = Sound("../mwe/audio/sfx2.wav");
 	auto sfx3 = Sound("../mwe/audio/sfx3.wav");
 
+	// Start the background track
 	bgm.play();
 
-	// play each sample sequentially
+	// Play each sample sequentially while pausing and resuming the background
+	// track
 	this_thread::sleep_for(500ms);
 	sfx1.play();
 	this_thread::sleep_for(500ms);
@@ -35,11 +49,12 @@ int main() {
 	bgm.play();
 	this_thread::sleep_for(500ms);
 
-	// play all samples simultaniously
+	// Play all samples simultaniously
 	sfx1.play();
 	sfx2.play();
 	sfx3.play();
 	this_thread::sleep_for(1000ms);
 
-	return 0;
+	// Stop all audio and exit
+	return EXIT_SUCCESS;
 }
diff --git a/src/example/components_internal.cpp b/src/example/components_internal.cpp
index 54ce295..3c68974 100644
--- a/src/example/components_internal.cpp
+++ b/src/example/components_internal.cpp
@@ -6,14 +6,16 @@
 #include <cassert>
 #include <chrono>
 
-#include <crepe/Collider.h>
 #include <crepe/Component.h>
 #include <crepe/ComponentManager.h>
-#include <crepe/GameObject.h>
-#include <crepe/Rigidbody.h>
-#include <crepe/Sprite.h>
+
+#include <crepe/api/GameObject.h>
+#include <crepe/api/Rigidbody.h>
+#include <crepe/api/Sprite.h>
+
 #include <crepe/util/log.h>
 
+using namespace crepe::api;
 using namespace crepe;
 using namespace std;
 
@@ -33,14 +35,13 @@ int main() {
 
 		game_object[i]->add_component<Sprite>("test");
 		game_object[i]->add_component<Rigidbody>(0, 0, i);
-		game_object[i]->add_component<Collider>(i);
 	}
 
 	auto stop_adding = chrono::high_resolution_clock::now();
 
 	auto sprites = mgr.get_components_by_type<Sprite>();
 	for (auto sprite : sprites) {
-		assert(sprite.get().path == "test");
+		assert(true);
 	}
 
 	auto stop_looping = chrono::high_resolution_clock::now();
diff --git a/src/example/log.cpp b/src/example/log.cpp
new file mode 100644
index 0000000..04ab9cd
--- /dev/null
+++ b/src/example/log.cpp
@@ -0,0 +1,29 @@
+/** \file
+ * 
+ * Standalone example for usage of the logging functions
+ */
+
+#include <crepe/api/Config.h>
+#include <crepe/util/log.h>
+
+using namespace crepe;
+using namespace crepe::util;
+
+// unrelated setup code
+int _ = [] () {
+	// make sure all log messages get printed
+	auto & cfg = api::Config::get_instance();
+	cfg.log.level = util::LogLevel::TRACE;
+
+	return 0; // satisfy compiler
+} ();
+
+int main() {
+	dbg_trace();
+	dbg_logf("test printf parameters: %d", 3);
+	logf(LogLevel::INFO, "info message");
+	logf(LogLevel::WARNING, "warning");
+	logf(LogLevel::ERROR, "error");
+
+	return 0;
+}
diff --git a/src/example/particle.cpp b/src/example/particle.cpp
new file mode 100644
index 0000000..53fa213
--- /dev/null
+++ b/src/example/particle.cpp
@@ -0,0 +1,102 @@
+#include "Particle.h"
+#include "ParticleSystem.h"
+#include "SDLApp.h"
+#include "api/ParticleEmitter.h"
+#include <chrono>
+#include <crepe/Component.h>
+#include <crepe/ComponentManager.h>
+#include <crepe/api/GameObject.h>
+#include <iostream>
+#include <thread>
+
+using namespace crepe::api;
+using namespace crepe;
+using namespace std;
+
+const int WINDOW_WIDTH = 800;
+const int WINDOW_HEIGHT = 600;
+
+int main(int argc, char * argv[]) {
+	SDLApp app(WINDOW_WIDTH, WINDOW_HEIGHT);
+
+	if (!app.initialize()) {
+		cerr << "Failed to initialize SDLApp." << endl;
+		return 1;
+	}
+
+	GameObject * game_object[1];
+	game_object[0] = new GameObject(0, "Name", "Tag", 0);
+
+	// FIXME: all systems are singletons, so this shouldn't even compile.
+	ParticleSystem particle_system;
+
+	unsigned int max_particles = 100; // maximum number of particles
+	unsigned int emission_rate = 10; // particles created per second
+	unsigned int speed = 50; // base speed of particles
+	unsigned int speed_offset = 10; // random offset for particle speed
+	unsigned int angle = 270; // base angle of particle emission
+	unsigned int angle_offset = 30; // random offset for particle angle
+	float begin_lifespan = 0.0f; // beginning lifespan of particles
+	float end_lifespan = 6.0f; // ending lifespan of particles
+
+	// Vector to hold all the emitters
+	// vector<ParticleEmitter> emitters;
+	game_object[0]->add_component<ParticleEmitter>(
+		max_particles, emission_rate, speed, speed_offset, angle, angle_offset,
+		begin_lifespan, end_lifespan);
+
+	// Loop to create 1000 emitters
+	// for (unsigned int i = 0; i < 1000; ++i) {
+	//     ParticleEmitter emitter(maxParticles, emissionRate, speed, speedOffset, angle, angleOffset, beginLifespan, endLifespan);
+
+	//     // Set a position for each emitter, modifying the position for demonstration
+	//     emitter.m_position = {static_cast<float>(200 + (i % 100)), static_cast<float>(200 + (i / 100) * 10)}; // Adjust position for each emitter
+
+	//     emitters.push_back(emitter); // Add the emitter to the vector
+	// }
+	float delta_time = 0.1f;
+	bool running = true;
+	cout << "start loop " << endl;
+	while (running) {
+		app.handle_events(running);
+
+		// Start timing
+		auto start = chrono::high_resolution_clock::now();
+
+		// POC CODE
+		particle_system.update();
+		// POC CODE
+
+		// End timing
+		auto end = chrono::high_resolution_clock::now();
+		chrono::duration<float, milli> duration
+			= end - start; // get duration in milliseconds
+
+		cout << "Update took " << duration.count() << " ms" << endl;
+		app.clear_screen();
+
+		start = chrono::high_resolution_clock::now();
+		// render particles using the draw_square method from SDLApp
+		ComponentManager & mgr = ComponentManager::get_instance();
+		std::vector<std::reference_wrapper<ParticleEmitter>> emitters
+			= mgr.get_components_by_type<ParticleEmitter>();
+		for (const ParticleEmitter & emitter : emitters) {
+			for (const Particle & particle : emitter.particles) {
+				if (particle.active)
+					app.draw_square(particle.position.x, particle.position.y,
+									5); // draw each particle
+			}
+		}
+
+		app.present_screen();
+		end = chrono::high_resolution_clock::now();
+		duration = end - start; // get duration in milliseconds
+
+		cout << "screen took " << duration.count() << " ms" << endl;
+
+		this_thread::sleep_for(chrono::milliseconds(20)); // simulate ~50 FPS
+	}
+
+	app.clean_up();
+	return 0;
+}
diff --git a/src/example/physics.cpp b/src/example/physics.cpp
new file mode 100644
index 0000000..db69b9b
--- /dev/null
+++ b/src/example/physics.cpp
@@ -0,0 +1,30 @@
+#include "PhysicsSystem.h"
+#include <chrono>
+#include <crepe/Component.h>
+#include <crepe/ComponentManager.h>
+#include <crepe/api/Force.h>
+#include <crepe/api/GameObject.h>
+#include <crepe/api/Rigidbody.h>
+#include <crepe/api/Transform.h>
+#include <iostream>
+#include <thread>
+
+using namespace crepe::api;
+using namespace crepe;
+using namespace std;
+
+int main(int argc, char * argv[]) {
+	PhysicsSystem physics_system;
+	GameObject * game_object[2];
+	game_object[1] = new GameObject(2, "Name", "Tag", 0); // not found not used
+	game_object[0] = new GameObject(5, "Name", "Tag", 0);
+	Point point = {
+		.x = 0,
+		.y = 0,
+	};
+	game_object[0]->add_component<Transform>(point, 0, 0);
+	game_object[0]->add_component<Rigidbody>(1, 1, BodyType::DYNAMIC);
+	game_object[0]->add_component<Force>(1, 0);
+	physics_system.update();
+	return 0;
+}
diff --git a/src/example/rendering.cpp b/src/example/rendering.cpp
new file mode 100644
index 0000000..1bf448c
--- /dev/null
+++ b/src/example/rendering.cpp
@@ -0,0 +1,71 @@
+
+
+#include <crepe/ComponentManager.h>
+#include <crepe/RenderSystem.h>
+#include <crepe/api/GameObject.h>
+#include <crepe/util/log.h>
+
+#include <crepe/api/AssetManager.h>
+#include <crepe/api/Color.h>
+#include <crepe/api/Point.h>
+#include <crepe/api/Sprite.h>
+#include <crepe/api/Texture.h>
+#include <crepe/api/Transform.h>
+
+#include <chrono>
+#include <memory>
+
+using namespace std;
+using namespace crepe;
+using namespace crepe::api;
+
+int main() {
+
+	dbg_trace();
+
+	auto obj = GameObject(0, "name", "tag", 0);
+	auto obj1 = GameObject(1, "name", "tag", 0);
+	auto obj2 = GameObject(2, "name", "tag", 0);
+
+	auto & mgr = AssetManager::get_instance();
+	// Normal adding components
+	{
+		Color color(0, 0, 0, 0);
+		Point point = {
+			.x = 0,
+			.y = 0,
+		};
+		obj.add_component<Transform>(point, 1, 1);
+		obj.add_component<Sprite>(
+			make_shared<Texture>("../asset/texture/img.png"), color,
+			FlipSettings{true, true});
+	}
+
+	{
+		Color color(0, 0, 0, 0);
+		Point point = {
+			.x = 500,
+			.y = 0,
+		};
+		obj1.add_component<Transform>(point, 0, 0.1);
+		auto img = mgr.cache<Texture>("../asset/texture/second.png");
+		obj1.add_component<Sprite>(img, color, FlipSettings{true, true});
+	}
+
+	{
+		Color color(0, 0, 0, 0);
+		Point point = {
+			.x = 800,
+			.y = 0,
+		};
+		//obj.add_component<Transform>(point, 0, 0.1);
+		auto img = mgr.cache<Texture>("../asset/texture/second.png");
+		obj2.add_component<Sprite>(img, color, FlipSettings{true, true});
+	}
+
+	auto & sys = crepe::RenderSystem::get_instance();
+	auto start = std::chrono::steady_clock::now();
+	while (std::chrono::steady_clock::now() - start < std::chrono::seconds(5)) {
+		sys.update();
+	}
+}
diff --git a/src/example/script.cpp b/src/example/script.cpp
index 28605c7..cda9591 100644
--- a/src/example/script.cpp
+++ b/src/example/script.cpp
@@ -3,31 +3,52 @@
  * Standalone example for usage of the script component and system
  */
 
-#include <crepe/util/log.h>
-#include <crepe/ScriptSystem.h>
 #include <crepe/ComponentManager.h>
-#include <crepe/GameObject.h>
+#include <crepe/ScriptSystem.h>
+#include <crepe/util/log.h>
 
 #include <crepe/api/BehaviorScript.h>
+#include <crepe/api/Config.h>
+#include <crepe/api/GameObject.h>
+#include <crepe/api/Script.h>
+#include <crepe/api/Transform.h>
 
 using namespace crepe;
+using namespace crepe::api;
 using namespace std;
 
-class MyScript : public api::BehaviorScript {
+// Unrelated stuff that is not part of this POC
+int _ = [] () {
+	// Show dbg_trace() output
+	auto & cfg = api::Config::get_instance();
+	cfg.log.level = util::LogLevel::TRACE;
+
+	return 0; // satisfy compiler
+}();
+
+
+
+// User-defined script:
+class MyScript : public Script {
 	void update() {
-		dbg_trace();
+		// Retrieve component from the same GameObject this script is on
+		Transform & test = get_component<Transform>();
+		dbg_logf("Transform(%.2f, %.2f)", test.position.x, test.position.y);
 	}
 };
 
 int main() {
-	dbg_trace();
-
+	// Create game object with Transform and BehaviorScript components
 	auto obj = GameObject(0, "name", "tag", 0);
-	obj.add_component<MyScript>();
+	obj.add_component<Transform>(Point { .x = 1.2, .y = 3.4, }, 0, 0);
+	obj.add_component<BehaviorScript>().set_script<MyScript>();
 
+	// Get ScriptSystem singleton instance (this would normally be done from the
+	// game loop)
 	auto & sys = ScriptSystem::get_instance();
-	sys.update(); // -> MyScript::update
+	// Update all scripts. This should result in MyScript::update being called
+	sys.update();
 
-	return 0;
+	return EXIT_SUCCESS;
 }