From 3dfe2108cfab31ba3ee5527e217d0d8e99a51162 Mon Sep 17 00:00:00 2001
From: git perforce import user <a@b>
Date: Tue, 25 Oct 2016 12:29:14 -0600
Subject: Initial commit: PhysX 3.4.0 Update @ 21294896 APEX 1.4.0 Update @
 21275617

[CL 21300167]
---
 .../PhysXExtensions/src/ExtSmoothNormals.cpp       | 145 +++++++++++++++++++++
 1 file changed, 145 insertions(+)
 create mode 100644 PhysX_3.4/Source/PhysXExtensions/src/ExtSmoothNormals.cpp

(limited to 'PhysX_3.4/Source/PhysXExtensions/src/ExtSmoothNormals.cpp')

diff --git a/PhysX_3.4/Source/PhysXExtensions/src/ExtSmoothNormals.cpp b/PhysX_3.4/Source/PhysXExtensions/src/ExtSmoothNormals.cpp
new file mode 100644
index 00000000..35d511cc
--- /dev/null
+++ b/PhysX_3.4/Source/PhysXExtensions/src/ExtSmoothNormals.cpp
@@ -0,0 +1,145 @@
+// This code contains NVIDIA Confidential Information and is disclosed to you
+// under a form of NVIDIA software license agreement provided separately to you.
+//
+// Notice
+// NVIDIA Corporation and its licensors retain all intellectual property and
+// proprietary rights in and to this software and related documentation and
+// any modifications thereto. Any use, reproduction, disclosure, or
+// distribution of this software and related documentation without an express
+// license agreement from NVIDIA Corporation is strictly prohibited.
+//
+// ALL NVIDIA DESIGN SPECIFICATIONS, CODE ARE PROVIDED "AS IS.". NVIDIA MAKES
+// NO WARRANTIES, EXPRESSED, IMPLIED, STATUTORY, OR OTHERWISE WITH RESPECT TO
+// THE MATERIALS, AND EXPRESSLY DISCLAIMS ALL IMPLIED WARRANTIES OF NONINFRINGEMENT,
+// MERCHANTABILITY, AND FITNESS FOR A PARTICULAR PURPOSE.
+//
+// Information and code furnished is believed to be accurate and reliable.
+// However, NVIDIA Corporation assumes no responsibility for the consequences of use of such
+// information or for any infringement of patents or other rights of third parties that may
+// result from its use. No license is granted by implication or otherwise under any patent
+// or patent rights of NVIDIA Corporation. Details are subject to change without notice.
+// This code supersedes and replaces all information previously supplied.
+// NVIDIA Corporation products are not authorized for use as critical
+// components in life support devices or systems without express written approval of
+// NVIDIA Corporation.
+//
+// Copyright (c) 2008-2016 NVIDIA Corporation. All rights reserved.
+// Copyright (c) 2004-2008 AGEIA Technologies, Inc. All rights reserved.
+// Copyright (c) 2001-2004 NovodeX AG. All rights reserved.  
+
+
+#include "foundation/PxMemory.h"
+#include "PxSmoothNormals.h"
+#include "PsMathUtils.h"
+#include "PsUserAllocated.h"
+#include "PsUtilities.h"
+#include "CmPhysXCommon.h"
+
+using namespace physx;
+
+static PxReal computeAngle(const PxVec3* verts, const PxU32* refs, PxU32 vref)
+{
+	PxU32 e0=0,e2=0;
+	if(vref==refs[0])
+	{
+		e0 = 2;
+		e2 = 1;
+	}
+	else if(vref==refs[1])
+	{
+		e0 = 2;
+		e2 = 0;
+	}
+	else if(vref==refs[2])
+	{
+		e0 = 0;
+		e2 = 1;
+	}
+	else
+	{
+		PX_ASSERT(0);
+	}
+	const PxVec3 edge0 = verts[refs[e0]] - verts[vref];
+	const PxVec3 edge1 = verts[refs[e2]] - verts[vref];
+
+	return Ps::angle(edge0, edge1);
+}
+
+bool PxBuildSmoothNormals(PxU32 nbTris, PxU32 nbVerts, const PxVec3* verts, const PxU32* dFaces, const PxU16* wFaces, PxVec3* normals, bool flip)
+{
+	if(!verts || !normals || !nbTris || !nbVerts)	
+		return false;
+
+	// Get correct destination buffers
+	// - if available, write directly to user-provided buffers
+	// - else get some ram and keep track of it
+	PxVec3* FNormals = reinterpret_cast<PxVec3*>(PX_ALLOC_TEMP(sizeof(PxVec3)*nbTris, "PxVec3"));
+	if(!FNormals) return false;
+
+	// Compute face normals
+	const PxU32 c = PxU32(flip!=0);
+	for(PxU32 i=0; i<nbTris; i++)
+	{
+		// compute indices outside of array index to workaround
+		// SNC bug which was generating incorrect addresses
+		const PxU32 i0 = i*3+0;
+		const PxU32 i1 = i*3+1+c;
+		const PxU32 i2 = i*3+2-c;
+
+		const PxU32 Ref0 = dFaces ? dFaces[i0] : wFaces ? wFaces[i0] : 0;
+		const PxU32 Ref1 = dFaces ? dFaces[i1] : wFaces ? wFaces[i1] : 1;
+		const PxU32 Ref2 = dFaces ? dFaces[i2] : wFaces ? wFaces[i2] : 2;
+
+		FNormals[i] = (verts[Ref2]-verts[Ref0]).cross(verts[Ref1] - verts[Ref0]);
+		PX_ASSERT(!FNormals[i].isZero());
+		FNormals[i].normalize();
+	}
+
+	// Compute vertex normals
+	PxMemSet(normals, 0, nbVerts*sizeof(PxVec3));
+
+	// TTP 3751
+	PxVec3* TmpNormals = reinterpret_cast<PxVec3*>(PX_ALLOC_TEMP(sizeof(PxVec3)*nbVerts, "PxVec3"));
+	PxMemSet(TmpNormals, 0, nbVerts*sizeof(PxVec3));
+	for(PxU32 i=0;i<nbTris;i++)
+	{
+		PxU32 Ref[3];
+		Ref[0] = dFaces ? dFaces[i*3+0] : wFaces ? wFaces[i*3+0] : 0;
+		Ref[1] = dFaces ? dFaces[i*3+1] : wFaces ? wFaces[i*3+1] : 1;
+		Ref[2] = dFaces ? dFaces[i*3+2] : wFaces ? wFaces[i*3+2] : 2;
+
+		for(PxU32 j=0;j<3;j++)
+		{
+			if(TmpNormals[Ref[j]].isZero())
+				TmpNormals[Ref[j]] = FNormals[i];
+		}
+	}
+	//~TTP 3751
+
+	for(PxU32 i=0;i<nbTris;i++)
+	{
+		PxU32 Ref[3];
+		Ref[0] = dFaces ? dFaces[i*3+0] : wFaces ? wFaces[i*3+0] : 0;
+		Ref[1] = dFaces ? dFaces[i*3+1] : wFaces ? wFaces[i*3+1] : 1;
+		Ref[2] = dFaces ? dFaces[i*3+2] : wFaces ? wFaces[i*3+2] : 2;
+
+		normals[Ref[0]] += FNormals[i] * computeAngle(verts, Ref, Ref[0]);
+		normals[Ref[1]] += FNormals[i] * computeAngle(verts, Ref, Ref[1]);
+		normals[Ref[2]] += FNormals[i] * computeAngle(verts, Ref, Ref[2]);
+	}
+
+	// Normalize vertex normals
+	for(PxU32 i=0;i<nbVerts;i++)
+	{
+		if(normals[i].isZero())
+			normals[i] = TmpNormals[i];
+//		PX_ASSERT(!normals[i].isZero());
+		normals[i].normalize();
+	}
+
+	PX_FREE_AND_RESET(TmpNormals);	// TTP 3751
+	PX_FREE_AND_RESET(FNormals);
+
+	return true;
+}
+
-- 
cgit v1.2.3