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//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// * Neither the name of NVIDIA CORPORATION nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
// OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Copyright (c) 2018 NVIDIA Corporation. All rights reserved.
#ifndef RAND_STATE_HELPERS_H
#define RAND_STATE_HELPERS_H
#include "PxTask.h"
#include "ApexMirroredArray.h"
namespace nvidia
{
namespace apex
{
// For CUDA PRNG: host part
PX_INLINE void InitDevicePRNGs(
SceneIntl& scene,
unsigned int blockSize,
LCG_PRNG& threadLeap,
LCG_PRNG& gridLeap,
ApexMirroredArray<LCG_PRNG>& blockPRNGs)
{
threadLeap = LCG_PRNG::getDefault().leapFrog(16);
LCG_PRNG randBlock = LCG_PRNG::getIdentity();
LCG_PRNG randBlockLeap = threadLeap.leapFrog(blockSize);
const uint32_t numBlocks = 32; //Max Multiprocessor count
blockPRNGs.setSize(numBlocks, ApexMirroredPlace::CPU_GPU);
for (uint32_t i = 0; i < numBlocks; ++i)
{
blockPRNGs[i] = randBlock;
randBlock *= randBlockLeap;
}
gridLeap = randBlock;
{
PxTaskManager* tm = scene.getTaskManager();
PxCudaContextManager* ctx = tm->getGpuDispatcher()->getCudaContextManager();
PxScopedCudaLock s(*ctx);
PxGpuCopyDesc desc;
blockPRNGs.copyHostToDeviceDesc(desc, 0, 0);
tm->getGpuDispatcher()->launchCopyKernel(&desc, 1, 0);
}
}
}
} // nvidia::apex::
#endif
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