introduce intersectable interface

openVulkanoCpp/Scene/Drawable.hpp

@@ -7,6 +7,7 @@
 #pragma once
 
 #include "Base/ICloseable.hpp"
+#include "Scene/IRayIntersectable.hpp"
 #include "DrawEncoder.hpp"
 #include <memory>
 #include <vector>
@@ -26,13 +27,14 @@ namespace OpenVulkano::Scene
 		BACKGROUND = 0, MAIN, TRANSPARENT, POST
 	};
 
-	class Drawable : public ICloseable
+	class Drawable : public ICloseable, public IRayIntersectable
 	{
 		std::vector<Node*> m_nodes;
 		Scene* m_scene = nullptr;
 		Shader* m_shader = nullptr;
 		const DrawEncoder m_encoder;
 		const DrawPhase m_drawPhase;
+		bool m_isHittable = false;
 
 	public:
 		explicit Drawable(const DrawEncoder& encoder,
@@ -45,6 +47,12 @@ namespace OpenVulkano::Scene
 
 		void SetShader(Shader* shader) { m_shader = shader; }
 
+		std::optional<RayHit> Intersect(const Ray& ray) const override { return {}; }
+
+		void SetIsHittable(bool hittable) { m_isHittable = hittable; }
+
+		bool IsHittable() const { return m_isHittable; }
+
 		[[nodiscard]] Scene* GetScene() const { return m_scene; }
 
 		[[nodiscard]] const auto& GetNodes() const { return m_nodes; }

openVulkanoCpp/Scene/IRayIntersectable.hpp

@@ -0,0 +1,18 @@
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+#pragma once
+
+#include "Scene/Ray.hpp"
+
+namespace OpenVulkano::Scene
+{
+	class IRayIntersectable
+	{
+	public:
+		virtual std::optional<RayHit> Intersect(const Ray& ray) const = 0;
+	};
+}

openVulkanoCpp/Scene/Prefabs/LabelDrawable.cpp

@@ -80,6 +80,11 @@ namespace OpenVulkano::Scene
 		m_billboardSettings = settings;
 	}
 
+	std::optional<RayHit> LabelDrawable::Intersect(const Ray& ray) const 
+	{ 
+		return ray.IntersectAABB(m_bbox);
+	}
+
 	void LabelDrawable::RecalculateBbox(const Math::AABB& other)
 	{
 		if (m_bbox.IsEmpty())

openVulkanoCpp/Scene/Prefabs/LabelDrawable.hpp

@@ -61,6 +61,7 @@ namespace OpenVulkano::Scene
 		Math::Vector3f& GetPosition() { return m_position; }
 		bool IsBillboard() const { return m_isBillboard; }
 		const Math::AABB& GetBoundingBox() const { return m_bbox; }
+		std::optional<RayHit> Intersect(const Ray& ray) const override;
 	private:
 		void RecalculateBbox(const Math::AABB& other);
 		void SetupShaders();

openVulkanoCpp/Scene/SimpleDrawable.cpp

@@ -5,6 +5,9 @@
  */
 
 #include "SimpleDrawable.hpp"
+#include "Scene/Geometry.hpp"
+#include "Scene/Shader/Shader.hpp"
+#include "Base/Logger.hpp"
 #include <stdexcept>
 
 namespace OpenVulkano::Scene
@@ -26,4 +29,61 @@ namespace OpenVulkano::Scene
 		m_uniBuffer = drawable->m_uniBuffer;
 		SetShader(drawable->GetShader());
 	}
+
+	std::optional<RayHit> SimpleDrawable::Intersect(const Ray& ray) const
+	{
+		if (!m_mesh || !GetShader())
+		{
+			return {};
+		}
+		if (m_mesh->aabb.IsEmpty())
+		{
+			m_mesh->CalculateAABB();
+		}
+		if (ray.IntersectAABB(m_mesh->aabb))
+		{
+			if (GetShader()->topology == Topology::TRIANGLE_LIST)
+			{
+				if (m_mesh->indexCount != 0)
+				{
+					for (int i = 0; i < m_mesh->indexCount / 3; i++)
+					{
+						if (m_mesh->indexType == VertexIndexType::UINT16)
+						{
+							uint16_t* indices = m_mesh->GetIndices16();
+							if (auto hit = ray.IntersectTriangle(m_mesh->vertices[indices[i * 3]].position,
+								m_mesh->vertices[indices[i * 3 + 1]].position,
+								m_mesh->vertices[indices[i * 3 + 2]].position))
+							{
+								return hit;
+							}
+						}
+						else
+						{
+							uint32_t* indices = m_mesh->GetIndices32();
+							if (auto hit = ray.IntersectTriangle(m_mesh->vertices[indices[i * 3]].position,
+							                                     m_mesh->vertices[indices[i * 3 + 1]].position,
+							                                     m_mesh->vertices[indices[i * 3 + 2]].position))
+							{
+								return hit;
+							}
+						}
+					}
+				}
+				else
+				{
+					for (int i = 0; i < m_mesh->vertexCount / 3; i++)
+					{
+						if (auto hit = ray.IntersectTriangle(m_mesh->vertices[i * 3].position,
+						                                     m_mesh->vertices[i * 3 + 1].position,
+						                                     m_mesh->vertices[i * 3 + 2].position))
+						{
+							return hit;
+						}
+					}
+				}
+			}
+		}
+		return {};
+	}
 }

openVulkanoCpp/Scene/SimpleDrawable.hpp

@@ -44,6 +44,8 @@ namespace OpenVulkano::Scene
 
 		void Init(SimpleDrawable* drawable);
 
+		std::optional<RayHit> Intersect(const Ray& ray) const override;
+
 		[[nodiscard]] Geometry* GetMesh() const { return m_mesh; }
 
 		[[nodiscard]] Material* GetMaterial() const { return m_material; }