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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 "NvBlast.h"
#include "stdlib.h" // for abs() on linux
using namespace Nv::Blast;
using namespace Nv::Blast::VecMath;
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Profiles
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
typedef float(*ProfileFunction)(float, float, float, float);
float falloffProfile(float min, float max, float x, float f = 1.0f)
{
if (x > max) return 0.0f;
if (x < min) return f;
float y = 1.0f - (x - min) / (max - min);
return y * f;
}
float cutterProfile(float min, float max, float x, float f = 1.0f)
{
if (x > max || x < min) return 0.0f;
return f;
}
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Radial Graph Shader Template
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
template <ProfileFunction profile>
void RadialProfileGraphShader(NvBlastFractureBuffers* commandBuffers, const NvBlastGraphShaderActor* actor, const NvBlastProgramParams* params)
{
const uint32_t* graphNodeIndexLinks = actor->graphNodeIndexLinks;
const uint32_t firstGraphNodeIndex = actor->firstGraphNodeIndex;
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;
const NvBlastExtRadialDamageDesc* damageData = reinterpret_cast<const NvBlastExtRadialDamageDesc*>(params->damageDescBuffer);
const uint32_t damageCount = params->damageDescCount;
uint32_t outCount = 0;
uint32_t currentNodeIndex = firstGraphNodeIndex;
while (!Nv::Blast::isInvalidIndex(currentNodeIndex))
{
for (uint32_t adj = adjacencyPartition[currentNodeIndex]; adj < adjacencyPartition[currentNodeIndex + 1]; adj++)
{
uint32_t adjacentNodeIndex = adjacentNodeIndices[adj];
if (currentNodeIndex < adjacentNodeIndex)
{
uint32_t bondIndex = adjacentBondIndices[adj];
// skip bonds that are already broken or were visited already
// TODO: investigate why testing against health > -1.0f seems slower
// could reuse the island edge bitmap instead
if ((familyBondHealths[bondIndex] > 0.0f))
{
const NvBlastBond& bond = assetBonds[bondIndex];
float totalBondDamage = 0.0f;
for (uint32_t damageIndex = 0; damageIndex < damageCount; damageIndex++)
{
const NvBlastExtRadialDamageDesc& damage = damageData[damageIndex];
float relativePosition[3];
sub(damage.position, bond.centroid, relativePosition);
float distance = sqrtf(dot(relativePosition, relativePosition));
float dir[3];
normal(relativePosition, dir);
totalBondDamage += profile(damage.minRadius, damage.maxRadius, distance, damage.compressive);
}
if (totalBondDamage > 0.0f)
{
NvBlastBondFractureData& outCommand = commandBuffers->bondFractures[outCount++];
outCommand.nodeIndex0 = currentNodeIndex;
outCommand.nodeIndex1 = adjacentNodeIndex;
outCommand.health = totalBondDamage;
}
}
}
}
currentNodeIndex = graphNodeIndexLinks[currentNodeIndex];
}
commandBuffers->bondFractureCount = outCount;
commandBuffers->chunkFractureCount = 0;
}
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Radial Single Shader Template
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
template <ProfileFunction profile>
void RadialProfileSubgraphShader(NvBlastFractureBuffers* commandBuffers, const NvBlastSubgraphShaderActor* actor, const NvBlastProgramParams* params)
{
uint32_t chunkFractureCount = 0;
const uint32_t chunkIndex = actor->chunkIndex;
const NvBlastChunk* assetChunks = actor->assetChunks;
const NvBlastChunk& chunk = assetChunks[chunkIndex];
float totalDamage = 0.0f;
for (uint32_t i = 0; i < params->damageDescCount; ++i)
{
const NvBlastExtRadialDamageDesc& damage = reinterpret_cast<const NvBlastExtRadialDamageDesc*>(params->damageDescBuffer)[i];
float relativePosition[3];
sub(damage.position, chunk.centroid, relativePosition);
float distance = sqrtf(dot(relativePosition, relativePosition));
totalDamage += profile(damage.minRadius, damage.maxRadius, distance, damage.compressive);
}
if (totalDamage > 0.0f)
{
NvBlastChunkFractureData& frac = commandBuffers->chunkFractures[chunkFractureCount++];
frac.chunkIndex = chunkIndex;
frac.health = totalDamage;
}
commandBuffers->bondFractureCount = 0;
commandBuffers->chunkFractureCount = chunkFractureCount;
}
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Shader Instantiation
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
void NvBlastExtFalloffGraphShader(NvBlastFractureBuffers* commandBuffers, const NvBlastGraphShaderActor* actor, const NvBlastProgramParams* params)
{
RadialProfileGraphShader<falloffProfile>(commandBuffers, actor, params);
}
void NvBlastExtFalloffSubgraphShader(NvBlastFractureBuffers* commandBuffers, const NvBlastSubgraphShaderActor* actor, const NvBlastProgramParams* params)
{
RadialProfileSubgraphShader<falloffProfile>(commandBuffers, actor, params);
}
void NvBlastExtCutterGraphShader(NvBlastFractureBuffers* commandBuffers, const NvBlastGraphShaderActor* actor, const NvBlastProgramParams* params)
{
RadialProfileGraphShader<cutterProfile>(commandBuffers, actor, params);
}
void NvBlastExtCutterSubgraphShader(NvBlastFractureBuffers* commandBuffers, const NvBlastSubgraphShaderActor* actor, const NvBlastProgramParams* params)
{
RadialProfileSubgraphShader<cutterProfile>(commandBuffers, actor, params);
}
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Helper Functions
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
bool NvBlastExtDamageActorRadialFalloff(NvBlastActor* actor, NvBlastFractureBuffers* buffers, const NvBlastExtRadialDamageDesc* damageDescBuffer, uint32_t damageDescCount, const NvBlastExtMaterial* material, NvBlastLog logFn, NvBlastTimers* timers)
{
NvBlastDamageProgram program =
{
NvBlastExtFalloffGraphShader,
NvBlastExtFalloffSubgraphShader
};
NvBlastProgramParams params =
{
damageDescBuffer,
damageDescCount,
material
};
NvBlastActorGenerateFracture(buffers, actor, program, ¶ms, logFn, timers);
if (buffers->bondFractureCount > 0 || buffers->chunkFractureCount > 0)
{
NvBlastActorApplyFracture(nullptr, actor, buffers, logFn, timers);
return true;
}
return false;
}
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