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physx/samples/samplebase/SampleRandomPrecomputed.cpp

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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) 2008-2021 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 "SampleRandomPrecomputed.h"
+#include "PhysXSample.h"
+#include "SampleAllocator.h"
+#include "PxTkStream.h"
+
+using namespace PxToolkit;
+
+#define WRITE_SEQUENCE 0
+
+PX_FORCE_INLINE PxF32 flip(const PxF32* v)
+{
+	const PxU8* b = (const PxU8*)v;
+	PxF32 f;
+	PxU8* bf = (PxU8*)&f;
+	bf[0] = b[3];
+	bf[1] = b[2];
+	bf[2] = b[1];
+	bf[3] = b[0];
+	return f;
+}
+
+SampleRandomPrecomputed::SampleRandomPrecomputed(PhysXSample& app)
+: mPrecomputedRandomSequence(NULL),
+  mPrecomputedRandomSequenceCount(0)
+{
+	mPrecomputedRandomSequence = (PxF32*)SAMPLE_ALLOC(sizeof(PxF32)*(PRECOMPUTED_RANDOM_SEQUENCE_SIZE+1));
+
+#if WRITE_SEQUENCE
+	char buffer[256];
+	const char* filename = getSampleOutputDirManager().getFilePath("SampleBaseRandomSequence", buffer, false);
+	const PxF32 denom = (1.0f / float(RAND_MAX));
+	for(PxU32 i=0;i<PRECOMPUTED_RANDOM_SEQUENCE_SIZE;i++)
+	{
+		mPrecomputedRandomSequence[i] = float(rand()) * denom;
+	}
+	mPrecomputedRandomSequence[PRECOMPUTED_RANDOM_SEQUENCE_SIZE]=1.0f;
+	PxDefaultFileOutputStream stream(filename);
+	stream.write(mPrecomputedRandomSequence,sizeof(PxF32)*(PRECOMPUTED_RANDOM_SEQUENCE_SIZE+1));
+
+#else
+	const char* filename = getSampleMediaFilename("SampleBaseRandomSequence");
+	PxDefaultFileInputData stream(filename);
+	if(!stream.isValid())
+		app.fatalError("SampleBaseRandomSequence file not found");
+	stream.read(mPrecomputedRandomSequence,sizeof(PxF32)*(PRECOMPUTED_RANDOM_SEQUENCE_SIZE+1));
+
+	const bool mismatch = (1.0f != mPrecomputedRandomSequence[PRECOMPUTED_RANDOM_SEQUENCE_SIZE]);
+	if(mismatch)
+	{
+		for(PxU32 i=0;i<PRECOMPUTED_RANDOM_SEQUENCE_SIZE;i++)
+		{
+			mPrecomputedRandomSequence[i]=flip(&mPrecomputedRandomSequence[i]);
+		}
+	}
+
+#endif
+}
+
+SampleRandomPrecomputed::~SampleRandomPrecomputed()
+{
+	SAMPLE_FREE(mPrecomputedRandomSequence);
+	mPrecomputedRandomSequenceCount=0;
+}