1 files changed, 149 insertions, 0 deletions
diff --git a/NvBlast/sdk/extensions/shaders/source/NvBlastExtShearShaders.cpp b/NvBlast/sdk/extensions/shaders/source/NvBlastExtShearShaders.cpp
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+++ b/NvBlast/sdk/extensions/shaders/source/NvBlastExtShearShaders.cpp
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+/*
+* Copyright (c) 2016-2017, NVIDIA CORPORATION.  All rights reserved.
+*
+* NVIDIA CORPORATION and its licensors retain all intellectual property
+* and proprietary rights in and to this software, 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.
+*/
+
+#include "NvBlastExtDamageShaders.h"
+#include "NvBlastIndexFns.h"
+#include "NvBlastMath.h"
+#include "NvBlastGeometry.h"
+#include "NvBlastAssert.h"
+#include "stdlib.h" // for abs() on linux
+
+using namespace Nv::Blast;
+using namespace Nv::Blast::VecMath;
+
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+//													Graph Shader
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+void NvBlastExtShearGraphShader(NvBlastFractureBuffers* commandBuffers, const NvBlastGraphShaderActor* actor, const NvBlastProgramParams* params)
+{
+	const NvBlastExtMaterial* materialProperties = reinterpret_cast<const NvBlastExtMaterial*>(params->material);
+	const float graphChunkThreshold = materialProperties->graphChunkThreshold;
+	const float bondTangentialThreshold = materialProperties->bondTangentialThreshold;
+	const float damageAttenuation = 1.0f - materialProperties->damageAttenuation;
+
+	uint32_t chunkFractureCount = 0;
+	uint32_t chunkFractureCountMax = commandBuffers->chunkFractureCount;
+	uint32_t bondFractureCount = 0;
+	uint32_t bondFractureCountMax = commandBuffers->bondFractureCount;
+
+	for (uint32_t i = 0; i < params->damageDescCount; ++i)
+	{
+		const NvBlastExtShearDamageDesc& damage = reinterpret_cast<const NvBlastExtShearDamageDesc*>(params->damageDescBuffer)[i];
+
+		const uint32_t* graphNodeIndexLinks = actor->graphNodeIndexLinks;
+		const uint32_t firstGraphNodeIndex = actor->firstGraphNodeIndex;
+		const uint32_t* chunkIndices = actor->chunkIndices;
+		const uint32_t*	adjacencyPartition = actor->adjacencyPartition;
+		const uint32_t*	adjacentNodeIndices = actor->adjacentNodeIndices;
+		const uint32_t*	adjacentBondIndices = actor->adjacentBondIndices;
+		const NvBlastBond* assetBonds = actor->assetBonds;
+		const float* familyBondHealths = actor->familyBondHealths;
+
+		uint32_t closestNode = findNodeByPositionLinked(damage.position, firstGraphNodeIndex, graphNodeIndexLinks, adjacencyPartition, adjacentNodeIndices, adjacentBondIndices, assetBonds, familyBondHealths);
+		NVBLAST_ASSERT(!isInvalidIndex(closestNode));
+
+		float damageDir[3];
+		float damageMag = VecMath::normal(damage.shear, damageDir);
+
+		uint32_t nodeIndex = closestNode;
+		float maxDist = 0.0f;
+		uint32_t nextNode = invalidIndex<uint32_t>();
+
+		if (damageMag > graphChunkThreshold && chunkFractureCount < chunkFractureCountMax)
+		{
+			NvBlastChunkFractureData& frac = commandBuffers->chunkFractures[chunkFractureCount++];
+			frac.chunkIndex = chunkIndices[nodeIndex];
+			frac.health = damageMag * 2;
+		}
+
+		do {
+			const uint32_t startIndex = adjacencyPartition[nodeIndex];
+			const uint32_t stopIndex = adjacencyPartition[nodeIndex + 1];
+
+
+			for (uint32_t adjacentNodeIndex = startIndex; adjacentNodeIndex < stopIndex; adjacentNodeIndex++)
+			{
+				const uint32_t neighbourIndex = adjacentNodeIndices[adjacentNodeIndex];
+				const uint32_t bondIndex = adjacentBondIndices[adjacentNodeIndex];
+				const NvBlastBond& bond = assetBonds[bondIndex];
+
+				if (!(familyBondHealths[bondIndex] > 0.0f))
+					continue;
+
+				float shear = 1 * abs(1 - abs(VecMath::dot(damage.shear, bond.normal)));
+
+				float d[3]; VecMath::sub(bond.centroid, damage.position, d);
+				float ahead = VecMath::dot(d, damage.shear);
+				if (ahead > maxDist)
+				{
+					maxDist = ahead;
+					nextNode = neighbourIndex;
+				}
+
+				if (shear > bondTangentialThreshold && bondFractureCount < bondFractureCountMax)
+				{
+					NvBlastBondFractureData& frac = commandBuffers->bondFractures[bondFractureCount++];
+					frac.userdata = bond.userData;
+					frac.nodeIndex0 = nodeIndex;
+					frac.nodeIndex1 = neighbourIndex;
+					frac.health = shear;
+				}
+			}
+
+			if (nodeIndex == nextNode)
+				break;
+
+			nodeIndex = nextNode;
+
+			damageMag *= damageAttenuation;
+		} while (!isInvalidIndex(nextNode));
+	}
+
+	commandBuffers->bondFractureCount = bondFractureCount;
+	commandBuffers->chunkFractureCount = chunkFractureCount;
+}
+
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+//													Single Shader
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+void NvBlastExtShearSubgraphShader(NvBlastFractureBuffers* commandBuffers, const NvBlastSubgraphShaderActor* actor, const NvBlastProgramParams* params)
+{
+	const NvBlastExtMaterial* materialProperties = reinterpret_cast<const NvBlastExtMaterial*>(params->material);
+
+	uint32_t chunkFractureCount = 0;
+
+	float totalDamage = 0.0f;
+	for (uint32_t i = 0; i < params->damageDescCount; ++i)
+	{
+		const NvBlastExtShearDamageDesc& damage = reinterpret_cast<const NvBlastExtShearDamageDesc*>(params->damageDescBuffer)[i];
+
+		float damageDir[3];
+		float damageMag = VecMath::normal(damage.shear, damageDir);
+
+		if (damageMag > materialProperties->singleChunkThreshold)
+		{
+			totalDamage += damageMag * 2;
+		}
+	}
+
+	if (totalDamage > 0.0f)
+	{
+		NvBlastChunkFractureData& frac = commandBuffers->chunkFractures[chunkFractureCount++];
+		frac.chunkIndex = actor->chunkIndex;
+		frac.health = totalDamage;
+	}
+
+	commandBuffers->bondFractureCount = 0;
+	commandBuffers->chunkFractureCount = chunkFractureCount;
+}