[ADDED] simple collision logic for entities

src/entities/collision_entity.cpp

@@ -0,0 +1,38 @@
+#include "collision_entity.h"
+
+namespace entities
+{
+	CollisionEntity::CollisionEntity(const models::TexturedModel& model, const glm::vec3& position,
+		const glm::vec3& rotation, float scale, const collision::Box& bounding_box)
+		: Entity(model, position, rotation, scale),
+		bounding_box(bounding_box)
+	{
+		const glm::vec3& center = bounding_box.center_pos;
+		const glm::vec3& size = bounding_box.size;
+
+		min_xyz = glm::vec3(center.x - size.x, center.y - size.y, center.z - size.z);
+		max_xyz = glm::vec3(center.x + size.x, center.y + size.y, center.z + size.z);
+	}
+
+	void CollisionEntity::OnCollide(const collision::Collision& collision)
+	{
+		if (on_collide != nullptr)
+		{
+			on_collide(collision);
+		}
+	}
+
+	bool CollisionEntity::IsColliding(const glm::vec3& point) const
+	{
+		return (point.x >= min_xyz.x && point.x <= max_xyz.x) &&
+			(point.y >= min_xyz.y && point.y <= max_xyz.y) &&
+			(point.z >= min_xyz.z && point.z <= max_xyz.z);
+	}
+
+	bool CollisionEntity::IsColliding(const CollisionEntity& e) const
+	{
+		return (min_xyz.x <= e.max_xyz.x && max_xyz.x >= e.min_xyz.x) &&
+			(min_xyz.y <= e.max_xyz.y && max_xyz.y >= e.min_xyz.y) &&
+			(min_xyz.z <= e.max_xyz.z && max_xyz.z >= e.min_xyz.z);
+	}
+}