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/*
* Copyright (c) 2008-2017, 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.
*/
#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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