Engine directory for ticket #1

2026-03-10 16:00:46 +00:00 · 2012-09-19 11:15:01 -04:00 · 2012-09-19 11:15:01 -04:00 · 7dbfe6994d
commit 7dbfe6994d
parent 352279af7a
3795 changed files with 1363358 additions and 0 deletions
--- a/Engine/lib/opcode/OPC_Picking.cpp
+++ b/Engine/lib/opcode/OPC_Picking.cpp
@ -0,0 +1,181 @@
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+/*
+ *	OPCODE - Optimized Collision Detection
+ *	Copyright (C) 2001 Pierre Terdiman
+ *	Homepage: http://www.codercorner.com/Opcode.htm
+ */
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+/**
+ *	Contains code to perform "picking".
+ *	\file		OPC_Picking.cpp
+ *	\author		Pierre Terdiman
+ *	\date		March, 20, 2001
+ */
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+#include "Opcode.h"
+
+using namespace Opcode;
+
+#ifdef OPC_RAYHIT_CALLBACK
+
+/*
+	Possible RayCollider usages:
+	- boolean query (shadow feeler)
+	- closest hit
+	- all hits
+	- number of intersection (boolean)
+
+*/
+
+bool Opcode::SetupAllHits(RayCollider& collider, CollisionFaces& contacts)
+{
+	struct Local
+	{
+		static void AllContacts(const CollisionFace& hit, void* user_data)
+		{
+			CollisionFaces* CF = (CollisionFaces*)user_data;
+			CF->AddFace(hit);
+		}
+	};
+
+	collider.SetFirstContact(false);
+	collider.SetHitCallback(Local::AllContacts);
+	collider.SetUserData(&contacts);
+	return true;
+}
+
+bool Opcode::SetupClosestHit(RayCollider& collider, CollisionFace& closest_contact)
+{
+	struct Local
+	{
+		static void ClosestContact(const CollisionFace& hit, void* user_data)
+		{
+			CollisionFace* CF = (CollisionFace*)user_data;
+			if(hit.mDistance<CF->mDistance)	*CF = hit;
+		}
+	};
+
+	collider.SetFirstContact(false);
+	collider.SetHitCallback(Local::ClosestContact);
+	collider.SetUserData(&closest_contact);
+	closest_contact.mDistance = MAX_FLOAT;
+	return true;
+}
+
+bool Opcode::SetupShadowFeeler(RayCollider& collider)
+{
+	collider.SetFirstContact(true);
+	collider.SetHitCallback(null);
+	return true;
+}
+
+bool Opcode::SetupInOutTest(RayCollider& collider)
+{
+	collider.SetFirstContact(false);
+	collider.SetHitCallback(null);
+	// Results with collider.GetNbIntersections()
+	return true;
+}
+
+bool Opcode::Picking(
+CollisionFace& picked_face,
+const Ray& world_ray, const Model& model, const Matrix4x4* world,
+float min_dist, float max_dist, const Point& view_point, CullModeCallback callback, void* user_data)
+{
+	struct Local
+	{
+		struct CullData
+		{
+			CollisionFace*			Closest;
+			float					MinLimit;
+			CullModeCallback		Callback;
+			void*					UserData;
+			Point					ViewPoint;
+			const MeshInterface*	IMesh;
+		};
+
+		// Called for each stabbed face
+		static void RenderCullingCallback(const CollisionFace& hit, void* user_data)
+		{
+			CullData* Data = (CullData*)user_data;
+
+			// Discard face if we already have a closer hit
+			if(hit.mDistance>=Data->Closest->mDistance)	return;
+
+			// Discard face if hit point is smaller than min limit. This mainly happens when the face is in front
+			// of the near clip plane (or straddles it). If we keep the face nonetheless, the user can select an
+			// object that he may not even be able to see, which is very annoying.
+			if(hit.mDistance<=Data->MinLimit)	return;
+
+			// This is the index of currently stabbed triangle.
+			udword StabbedFaceIndex = hit.mFaceID;
+
+			// We may keep it or not, depending on backface culling
+			bool KeepIt = true;
+
+			// Catch *render* cull mode for this face
+			CullMode CM = (Data->Callback)(StabbedFaceIndex, Data->UserData);
+
+			if(CM!=CULLMODE_NONE)	// Don't even compute culling for double-sided triangles
+			{
+				// Compute backface culling for current face
+
+				VertexPointers VP;
+				Data->IMesh->GetTriangle(VP, StabbedFaceIndex);
+				if(VP.BackfaceCulling(Data->ViewPoint))
+				{
+					if(CM==CULLMODE_CW)		KeepIt = false;
+				}
+				else
+				{
+					if(CM==CULLMODE_CCW)	KeepIt = false;
+				}
+			}
+
+			if(KeepIt)	*Data->Closest = hit;
+		}
+	};
+
+	RayCollider RC;
+	RC.SetMaxDist(max_dist);
+	RC.SetTemporalCoherence(false);
+	RC.SetCulling(false);		// We need all faces since some of them can be double-sided
+	RC.SetFirstContact(false);
+	RC.SetHitCallback(Local::RenderCullingCallback);
+
+	picked_face.mFaceID		= INVALID_ID_OPC;
+	picked_face.mDistance	= MAX_FLOAT;
+	picked_face.mU			= 0.0f;
+	picked_face.mV			= 0.0f;
+
+	Local::CullData Data;
+	Data.Closest			= &picked_face;
+	Data.MinLimit			= min_dist;
+	Data.Callback			= callback;
+	Data.UserData			= user_data;
+	Data.ViewPoint			= view_point;
+	Data.IMesh				= model.GetMeshInterface();
+
+	if(world)
+	{
+		// Get matrices
+		Matrix4x4 InvWorld;
+		InvertPRMatrix(InvWorld, *world);
+
+		// Compute camera position in mesh space
+		Data.ViewPoint *= InvWorld;
+	}
+
+	RC.SetUserData(&Data);
+	if(RC.Collide(world_ray, model, world))
+	{
+		return picked_face.mFaceID!=INVALID_ID_OPC;
+	}
+	return false;
+}
+
+#endif