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]
---
 .../SampleCharacterCloth_TerrainBuilder.cpp        | 268 +++++++++++++++++++++
 1 file changed, 268 insertions(+)
 create mode 100644 PhysX_3.4/Samples/SampleCharacterCloth/SampleCharacterCloth_TerrainBuilder.cpp

(limited to 'PhysX_3.4/Samples/SampleCharacterCloth/SampleCharacterCloth_TerrainBuilder.cpp')

diff --git a/PhysX_3.4/Samples/SampleCharacterCloth/SampleCharacterCloth_TerrainBuilder.cpp b/PhysX_3.4/Samples/SampleCharacterCloth/SampleCharacterCloth_TerrainBuilder.cpp
new file mode 100644
index 00000000..c3443a10
--- /dev/null
+++ b/PhysX_3.4/Samples/SampleCharacterCloth/SampleCharacterCloth_TerrainBuilder.cpp
@@ -0,0 +1,268 @@
+// 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 "PxPhysicsAPI.h"
+#include "PxTkStream.h"
+#include "SampleCharacterCloth.h"
+
+using namespace PxToolkit;
+
+//#define USE_MESH
+
+static PxToolkit::BasicRandom gClothRandom;
+
+static PxReal randomScaled(PxReal value)
+{
+	PxReal val = value*(gClothRandom.randomFloat());
+	return val;
+}
+
+static void computeTerrain(bool* done, PxReal* pVB, PxU32 x0, PxU32 y0, PxU32 currentSize, PxReal value, PxU32 initSize)
+{
+	// Compute new size
+	currentSize>>=1;
+	if (currentSize > 0) {
+		PxU32 x1 = (x0+currentSize)			   % initSize;
+		PxU32 x2 = (x0+currentSize+currentSize) % initSize;
+		PxU32 y1 = (y0+currentSize)			   % initSize;
+		PxU32 y2 = (y0+currentSize+currentSize) % initSize;
+
+		if(!done[x1 + y0*initSize])	pVB[(x1 + y0*initSize)] = randomScaled(value) + 0.5f * (pVB[(x0 + y0*initSize)] + pVB[(x2 + y0*initSize)]);
+		if(!done[x0 + y1*initSize])	pVB[(x0 + y1*initSize)] = randomScaled(value) + 0.5f * (pVB[(x0 + y0*initSize)] + pVB[(x0 + y2*initSize)]);
+		if(!done[x2 + y1*initSize])	pVB[(x2 + y1*initSize)] = randomScaled(value) + 0.5f * (pVB[(x2 + y0*initSize)] + pVB[(x2 + y2*initSize)]);
+		if(!done[x1 + y2*initSize])	pVB[(x1 + y2*initSize)] = randomScaled(value) + 0.5f * (pVB[(x0 + y2*initSize)] + pVB[(x2 + y2*initSize)]);
+		if(!done[x1 + y1*initSize])	pVB[(x1 + y1*initSize)] = randomScaled(value) + 0.5f * (pVB[(x0 + y1*initSize)] + pVB[(x2 + y1*initSize)]);
+
+		done[x1 + y0*initSize] = true;
+		done[x0 + y1*initSize] = true;
+		done[x2 + y1*initSize] = true;
+		done[x1 + y2*initSize] = true;
+		done[x1 + y1*initSize] = true;
+
+		// Recurse through 4 corners
+		value *= 0.5f;
+		computeTerrain(done, pVB, x0,	y0,	currentSize, value, initSize);
+		computeTerrain(done, pVB, x0,	y1,	currentSize, value, initSize);
+		computeTerrain(done, pVB, x1,	y0,	currentSize, value, initSize);
+		computeTerrain(done, pVB, x1,	y1,	currentSize, value, initSize);
+	}
+}
+
+static void fractalize(PxReal* heights, const PxU32 size, const PxReal roughness)
+{
+	PxU32 num = size*size;
+	bool* done = (bool*)SAMPLE_ALLOC(sizeof(bool)*num);
+	for(PxU32 i=0; i<num; i++)
+		done[i]=false;
+	computeTerrain(done,heights,0,0,size,roughness,size);
+	SAMPLE_FREE(done);
+}
+
+PxRigidStatic* SampleCharacterCloth::buildHeightField()
+{
+	// create a height map
+	gClothRandom.setSeed(42);
+
+	const PxU32 hfSize = 32; // some power of 2
+	const PxU32 hfNumVerts = hfSize*hfSize;
+
+	const PxReal hfScale = 8.0f; // this is how wide one heightfield square is
+
+	PxReal* heightmap = (PxReal*)SAMPLE_ALLOC(sizeof(PxReal)*hfNumVerts);
+//	memset(heightmap,0,hfNumVerts*sizeof(PxReal));
+	for(PxU32 i = 0; i < hfNumVerts; i++)
+		heightmap[i] = -9.0f;
+
+	fractalize(heightmap,hfSize,16);
+
+	for(PxU32 i = 0; i < hfNumVerts; i++)
+		heightmap[i] -= 5.0f;
+
+	{ // make render terrain
+		PxReal* hfVerts = (PxReal*)SAMPLE_ALLOC(sizeof(PxReal)*hfNumVerts*3);
+		PxReal* hfNorms = (PxReal*)SAMPLE_ALLOC(sizeof(PxReal)*hfNumVerts*3);
+		const PxU32 hfNumTris = (hfSize-1)*(hfSize-1)*2;
+		PxU32* hfTris = (PxU32*)SAMPLE_ALLOC(sizeof(PxU32)*hfNumTris*3);
+
+		createLandscape(heightmap,hfSize,hfScale,hfVerts,hfNorms,hfTris);	
+
+ 		RAWMesh data;
+		data.mName = "terrain";
+		data.mTransform = PxTransform(PxIdentity);
+		data.mTransform.p = PxVec3(-(hfSize/2*hfScale),0,-(hfSize/2*hfScale));
+ 		data.mNbVerts = hfNumVerts;
+		data.mVerts = (PxVec3*)hfVerts;
+		data.mVertexNormals = (PxVec3*)hfNorms;
+		data.mUVs = 0;
+		data.mMaterialID = 0;
+		data.mNbFaces = hfNumTris;
+		data.mIndices = hfTris;
+
+		createRenderMeshFromRawMesh(data);
+
+		mNbVerts	= hfNumVerts;
+		mNbTris		= hfNumTris;
+		mVerts		= hfVerts;
+		mTris		= hfTris;
+
+		SAMPLE_FREE(hfNorms);
+	}
+
+	// eventually create the physics heightfield
+	PxRigidStatic* hfActor = createHeightField(heightmap,hfScale,hfSize);
+
+	SAMPLE_FREE(heightmap);
+
+	return hfActor;
+}
+
+void SampleCharacterCloth::createLandscape(PxReal* heightmap, PxU32 width, PxReal hfScale, PxReal* outVerts, PxReal* outNorms, PxU32* outTris)
+{
+	for(PxU32 y=0; y<width; y++)
+	{
+		for(PxU32 x=0; x<width; x++)
+		{
+			PxU32 index=(x+y*width)*3;
+
+			outVerts[index+0]=(PxReal(x))* hfScale;
+			outVerts[index+1]=heightmap[x+y*width];
+			outVerts[index+2]=(PxReal(y))*hfScale;
+			
+			outNorms[index+0]=0;
+			outNorms[index+1]=1;
+			outNorms[index+2]=0;
+		}
+	}
+
+	// Sobel filter
+	for (PxU32 y=1;y<width-1;y++) {
+		for (PxU32 x=1;x<width-1;x++) {
+
+			//  1  0 -1
+			//  2  0 -2
+			//  1  0 -1
+			PxReal dx;
+			dx  =   outVerts[((x-1)+(y-1)*width)*3+1];
+			dx -=   outVerts[((x+1)+(y-1)*width)*3+1];
+			dx += 2.0f*outVerts[((x-1)+(y+0)*width)*3+1];
+			dx -= 2.0f*outVerts[((x+1)+(y+0)*width)*3+1];
+			dx +=   outVerts[((x-1)+(y+1)*width)*3+1];
+			dx -=   outVerts[((x+1)+(y+1)*width)*3+1];
+
+			//  1  2  1
+			//  0  0  0
+			// -1 -2 -1
+			PxReal dy;
+			dy  =   outVerts[((x-1)+(y-1)*width)*3+1];
+			dy += 2.0f*outVerts[((x+0)+(y-1)*width)*3+1];
+			dy +=   outVerts[((x+1)+(y-1)*width)*3+1];
+			dy -=   outVerts[((x-1)+(y+1)*width)*3+1];
+			dy -= 2.0f*outVerts[((x+0)+(y+1)*width)*3+1];
+			dy -=   outVerts[((x+1)+(y+1)*width)*3+1];
+
+			PxReal nx = dx/hfScale*0.15f;
+			PxReal ny = 1.0f;
+			PxReal nz = dy/hfScale*0.15f;
+
+			PxReal len = sqrtf(nx*nx+ny*ny+nz*nz);
+
+			outNorms[(x+y*width)*3+0] = nx/len;
+			outNorms[(x+y*width)*3+1] = ny/len;
+			outNorms[(x+y*width)*3+2] = nz/len;
+		}
+	}
+
+	PxU32 numTris = 0;
+	for(PxU32 j=0; j<width-1; j++)
+	{
+		for(PxU32 i=0; i<width-1; i++)
+		{
+			outTris[3*numTris+0]= i   +  j   *(width);
+			outTris[3*numTris+1]= i   + (j+1)*(width);
+			outTris[3*numTris+2]= i+1 +  j   *(width);
+			outTris[3*numTris+3]= i   + (j+1)*(width);
+			outTris[3*numTris+4]= i+1 + (j+1)*(width);
+			outTris[3*numTris+5]= i+1 +  j   *(width);
+			numTris+=2;
+		}
+	}
+}
+
+PxRigidStatic* SampleCharacterCloth::createHeightField(PxReal* heightmap, PxReal hfScale, PxU32 hfSize)
+{
+	const PxReal heightScale = 0.01f;
+
+	PxU32 hfNumVerts = hfSize*hfSize;
+
+	PxHeightFieldSample* samples = (PxHeightFieldSample*)SAMPLE_ALLOC(sizeof(PxHeightFieldSample)*hfNumVerts);
+	memset(samples,0,hfNumVerts*sizeof(PxHeightFieldSample));
+	
+	for(PxU32 x = 0; x < hfSize; x++)
+	for(PxU32 y = 0; y < hfSize; y++)
+	{
+		PxI32 h = PxI32(heightmap[y+x*hfSize]/heightScale);
+		PX_ASSERT(h<=0xffff);
+		samples[x+y*hfSize].height = (PxI16)(h);
+		samples[x+y*hfSize].setTessFlag();
+		samples[x+y*hfSize].materialIndex0=1;
+		samples[x+y*hfSize].materialIndex1=1;
+	}
+
+	PxHeightFieldDesc hfDesc;
+	hfDesc.format = PxHeightFieldFormat::eS16_TM;
+	hfDesc.nbColumns = hfSize;
+	hfDesc.nbRows = hfSize;
+	hfDesc.samples.data = samples;
+	hfDesc.samples.stride = sizeof(PxHeightFieldSample);
+	
+	PxHeightField* heightField = getCooking().createHeightField(hfDesc, getPhysics().getPhysicsInsertionCallback());
+	if(!heightField)
+		fatalError("creating the heightfield failed");
+
+	PxTransform pose = PxTransform(PxIdentity);
+	pose.p = PxVec3(-(hfSize/2*hfScale),0,-(hfSize/2*hfScale));
+	mHFPose = pose;
+
+	PxRigidStatic* hfActor = getPhysics().createRigidStatic(pose);
+	if(!hfActor) 
+		fatalError("creating heightfield actor failed");
+
+	PxHeightFieldGeometry hfGeom(heightField, PxMeshGeometryFlags(), heightScale, hfScale, hfScale);
+	PxShape* hfShape = PxRigidActorExt::createExclusiveShape(*hfActor, hfGeom, getDefaultMaterial());
+	if(!hfShape) 
+		fatalError("creating heightfield shape failed");
+
+	getActiveScene().addActor(*hfActor);
+
+	SAMPLE_FREE(samples);
+
+	return hfActor;
+}
+
-- 
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