feat: add lights

src/engine.cpp

@@ -9,6 +9,7 @@
 
 #include "buffer.h"
 #include "camera.h"
+#include "light.h"
 #include "logger.h"
 #include "material.h"
 #include "mesh.h"
@@ -19,6 +20,10 @@
 #include "vertex.h"
 #include "world.h"
 
+// Instance variables
+std::shared_ptr<Light> point_light;
+
+// Constants
 constexpr int	 screen_width  = 800;
 constexpr int	 screen_height = 600;
 constexpr double fps_limit     = 1.0 / 60.0;
@@ -140,6 +145,7 @@ void Engine::setup()
 
 	// Create world
 	world_ = std::make_unique<World>();
+	world_->set_ambient(glm::vec3(0.2f, 0.2f, 0.2f));
 	Logger::info("World created");
 
 	// Create camera
@@ -180,6 +186,26 @@ void Engine::setup()
 		Logger::info("Gunslinger model loaded and added to world");
 	}
 
+	// Create directional light
+	auto directional_light = std::make_shared<Light>();
+	directional_light->set_type(Light::Type::DIRECTIONAL);
+	directional_light->set_color(glm::vec3(1.0f, 1.0f, 1.0f));
+	directional_light->set_intensity(1.0f);
+	directional_light->set_position(glm::normalize(
+	    glm::vec3(1.0f, 1.0f, 1.0f))); // Use position as direction
+	world_->add_entity(directional_light);
+	Logger::info("Directional light created and added to world");
+
+	// Create point light
+	point_light = std::make_shared<Light>();
+	point_light->set_type(Light::Type::POINT);
+	point_light->set_color(glm::vec3(1.0f, 0.0f, 0.0f));
+	point_light->set_intensity(2.0f);
+	point_light->set_linear_attenuation(0.2f);
+	point_light->set_position(glm::vec3(5.0f, 0.0f, 0.0f));
+	world_->add_entity(point_light);
+	Logger::info("Point light created and added to world");
+
 	Logger::info("Scene setup complete");
 }
 
@@ -227,6 +253,16 @@ void Engine::process_input(const double delta_time)
 
 void Engine::update(const double delta_time)
 {
+	// Update angle for orbiting light
+	angle_ += delta_time;
+
+	// Make point light orbit around the model
+	if (point_light) {
+		constexpr float radius = 7.5f;
+		point_light->set_position(glm::vec3(radius * cos(angle_), 2.0f,
+						    radius * sin(angle_)));
+	}
+
 	// Update world
 	world_->update(static_cast<float>(delta_time));
 }