[client] Fix SetModelScale having no clientside collisions

Origins:
1 - RaphaelIT7@dd24dae
2 - RaphaelIT7@4e6f0c1
3 - RaphaelIT7@f8faf4e
4 - RaphaelIT7@49f346e

Author: RaphaelIT7

game/client/c_baseanimating.cpp

@@ -789,6 +789,12 @@ C_BaseAnimating::~C_BaseAnimating()
 		m_pAttachedTo->RemoveBoneAttachment( this );
 		m_pAttachedTo = NULL;
 	}
+
+	if ( m_pScaledCollidable )
+	{
+		UTIL_RemoveScaledPhysCollide( m_pScaledCollidable );
+		m_pScaledCollidable = NULL;
+	}
 }
 
 bool C_BaseAnimating::UsesPowerOfTwoFrameBufferTexture( void )
@@ -5157,9 +5163,18 @@ void C_BaseAnimating::Simulate()
 	}
 }
 
-
 bool C_BaseAnimating::TestCollision( const Ray_t &ray, unsigned int fContentsMask, trace_t& tr )
 {
+	if ( GetModelScale() != 1.0f )
+	{
+		if ( m_pScaledCollidable != NULL )
+		{
+			physcollision->TraceBox( ray, m_pScaledCollidable, GetAbsOrigin(), GetAbsAngles(), &tr );
+		
+			return tr.DidHit();
+		}
+	}
+
 	if ( ray.m_IsRay && IsSolidFlagSet( FSOLID_CUSTOMRAYTEST ))
 	{
 		if (!TestHitboxes( ray, fContentsMask, tr ))
@@ -6706,3 +6721,22 @@ void C_BaseAnimating::MoveBoneAttachments( C_BaseAnimating* attachTarget )
 		}
 	}
 }
+
+//-----------------------------------------------------------------------------
+// Purpose: Update Collisions. (Same way it's done serverside. We only update it when Activate is called)
+//-----------------------------------------------------------------------------
+void C_BaseAnimating::Activate()
+{
+	if ( GetModelScale() != 1.0f )
+	{
+		if ( m_pScaledCollidable )
+		{
+			UTIL_RemoveScaledPhysCollide( m_pScaledCollidable );
+			m_pScaledCollidable = NULL;
+		}
+
+		m_pScaledCollidable = UTIL_GetScaledPhysCollide( GetModelIndex(), GetModelScale() );
+	}
+
+	BaseClass::Activate();
+}

game/client/c_baseanimating.h

@@ -449,6 +449,7 @@ class C_BaseAnimating : public C_BaseEntity, private IModelLoadCallback
 
 	virtual bool					IsViewModel() const;
 	void					UpdateOnRemove( void ) override;
+	virtual void					Activate( void );
 
 protected:
 	// View models scale their attachment positions to account for FOV. To get the unmodified
@@ -640,6 +641,9 @@ class C_BaseAnimating : public C_BaseEntity, private IModelLoadCallback
 	mutable MDLHandle_t				m_hStudioHdr;
 	CThreadFastMutex				m_StudioHdrInitLock;
 	bool							m_bHasAttachedParticles;
+
+private:
+	CPhysCollide					*m_pScaledCollidable;
 };
 
 enum 

game/client/c_baseentity.h

@@ -1709,6 +1709,9 @@ class C_BaseEntity : public IClientEntity
 
 private:
 	bool	m_bOldShouldDraw;
+
+public:
+	virtual void					OnModelChange( int oldModelIndex, int newModelIndex ) {};
 };
 
 EXTERN_RECV_TABLE(DT_BaseEntity);

game/client/cdll_util.cpp

@@ -28,6 +28,10 @@
 #include "view.h"
 #include "ixboxsystem.h"
 #include "inputsystem/iinputsystem.h"
+#include <unordered_map>
+#include <unordered_set>
+#include <vector>
+#include <vprof.h>
 
 // memdbgon must be the last include file in a .cpp file!!!
 #include "tier0/memdbgon.h"
@@ -1315,3 +1319,127 @@ bool UTIL_HasLoadedAnyMap()
 
 	return g_pFullFileSystem->FileExists( szFilename, "MOD" );
 }
+
+struct CPhysEntry
+{
+	int references = 1;
+	int modelIndex = 0;
+	float scale = 1.0f;
+};
+
+std::unordered_map<CPhysCollide*, CPhysEntry> g_pScaledReferences;
+std::unordered_map<int, std::unordered_map<float, CPhysCollide*>*> g_pScaledCollidables;
+CPhysCollide *UTIL_GetScaledPhysCollide( int modelIndex, float scale ) // Based off UTIL_CreateScaledPhysObject
+{
+	VPROF( "UTIL_GetScaledPhysCollide", VPROF_BUDGETGROUP_PHYSICS );
+
+	if (scale == 1.0f)
+		return NULL;
+
+	std::unordered_map<float, CPhysCollide*>* scaledCollidables = nullptr;
+	auto iModel = g_pScaledCollidables.find( modelIndex );
+	if ( iModel != g_pScaledCollidables.end() )
+	{
+		std::unordered_map<float, CPhysCollide*>* collidables = iModel->second;
+		auto iCollidable = collidables->find( scale );
+		if ( iCollidable != collidables->end() )
+		{
+			auto it = g_pScaledReferences.find( iCollidable->second );
+			if ( it != g_pScaledReferences.end() )
+			{
+				++it->second.references;
+			} else {
+				DevWarning( "UTIL_GetScaledPhysCollide: Failed to find reference counter!\n" );
+			}
+
+			return iCollidable->second;
+		} else {
+			scaledCollidables = collidables;
+		}
+	} else {
+		scaledCollidables = new std::unordered_map<float, CPhysCollide*>;
+		g_pScaledCollidables[modelIndex] = scaledCollidables;
+	}
+
+	ICollisionQuery *pQuery = physcollision->CreateQueryModel( modelinfo->GetVCollide( modelIndex )->solids[0] );
+	if ( pQuery == NULL )
+	{
+		Warning( "UTIL_GetScaledPhysCollide: Failed to created scaled CPhysCollide for model %s!\n", modelinfo->GetModelName( modelinfo->GetModel( modelIndex ) ) );
+		return NULL;
+	}
+
+	const int nNumConvex = pQuery->ConvexCount();
+	CPhysPolysoup *pPolySoups = physcollision->PolysoupCreate();
+
+	for ( int i = 0; i < nNumConvex; ++i )
+	{
+		int nNumTris = pQuery->TriangleCount( i );
+		int nNumVerts = nNumTris * 3;
+
+		Vector *pVerts = (Vector *) stackalloc( sizeof(Vector) * nNumVerts );
+		for ( int j = 0; j < nNumTris; ++j )
+		{
+			int p = j*3;
+			pQuery->GetTriangleVerts( i, j, pVerts+p );
+			*(pVerts+p) *= scale;
+			*(pVerts+p+1) *= scale;
+			*(pVerts+p+2) *= scale;
+		}
+
+		for ( int j = 0; j < nNumVerts; j += 3 )
+		{
+			physcollision->PolysoupAddTriangle( pPolySoups, pVerts[j], pVerts[j + 1], pVerts[j + 2], 0 );
+		}
+	}
+
+	physcollision->DestroyQueryModel( pQuery );
+
+	CPhysCollide* physCollide = physcollision->ConvertPolysoupToCollide( pPolySoups, true );
+	physcollision->PolysoupDestroy( pPolySoups );
+	if ( physCollide == NULL )
+	{
+		Warning( "UTIL_GetScaledPhysCollide: Failed to created scaled CPhysCollide for model %s %f!\n", modelinfo->GetModelName( modelinfo->GetModel( modelIndex ) ), scale );
+		return NULL;
+	}
+
+	(*scaledCollidables)[scale] = physCollide;
+
+	CPhysEntry entry;
+	entry.modelIndex = modelIndex;
+	entry.scale = scale;
+	g_pScaledReferences[physCollide] = entry;
+
+	return physCollide;
+}
+
+void UTIL_RemoveScaledPhysCollide( CPhysCollide *physCollide )
+{
+	VPROF( "UTIL_RemoveScaledPhysCollide", VPROF_BUDGETGROUP_PHYSICS );
+
+	auto it = g_pScaledReferences.find( physCollide );
+	if ( it != g_pScaledReferences.end() )
+	{
+		--it->second.references;
+		if (it->second.references > 0)
+			return;
+	} else {
+		DevWarning( "UTIL_GetScaledPhysCollide: Failed to find reference counter!\n" );
+	}
+
+	auto iModel = g_pScaledCollidables.find( it->second.modelIndex );
+	if ( iModel == g_pScaledCollidables.end() )
+		return;
+
+	std::unordered_map<float, CPhysCollide*> scaledCollibales = *iModel->second;
+	auto iEntry = scaledCollibales.find( it->second.scale );
+	if ( iEntry == scaledCollibales.end() )
+		return;
+
+	scaledCollibales.erase( iEntry->first );
+	physcollision->DestroyCollide( physCollide );
+
+	if ( scaledCollibales.size() == 0 )
+		g_pScaledCollidables.erase( iModel );
+
+	DevMsg( "UTIL_RemoveScaledPhysCollide: Freed model %s\n", modelinfo->GetModelName(modelinfo->GetModel(it->second.modelIndex)) );
+}

game/client/cdll_util.h

@@ -32,6 +32,8 @@ class IClientEntity;
 class CHudTexture;
 class CGameTrace;
 class C_BaseEntity;
+class C_BaseAnimating;
+class CPhysCollide;
 
 struct Ray_t;
 struct client_textmessage_t;
@@ -184,4 +186,12 @@ int UTIL_GetMapKeyCount( const char *pszCustomKey );
 // Returns true if the user has loaded any maps, false otherwise.
 bool UTIL_HasLoadedAnyMap();
 
+// SetModelScale being clientside broken fix
+// Returns the given CPhysCollide for the given model index and scale. If not found it will create it.
+CPhysCollide* UTIL_GetScaledPhysCollide( int modelIndex, float scale );
+
+// Frees the given CPhysCollide if the internal reference count reaches 0.
+// NOTE: Only supports CPhysCollide created by UTIL_GetScaledPhysCollide!
+void UTIL_RemoveScaledPhysCollide( CPhysCollide *physCollide );
+
 #endif // !UTIL_H