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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) 2008-2018 NVIDIA Corporation. All rights reserved.
#ifndef PLATFORM_STREAM_H_
#define PLATFORM_STREAM_H_
#include <stdio.h>
#include "nvparameterized/NvParameterized.h"
#include "nvparameterized/NvSerializer.h"
#include "NvSerializerInternal.h"
#include "PlatformABI.h"
namespace NvParameterized
{
// Base class for ABI-aware streams
// TODO:
// PlatformInput/OutputStream should probably be visitors
class PlatformStream
{
void operator =(const PlatformStream &); //Don't
protected:
Traits *mTraits;
PlatformABI mTargetParams, mCurParams;
struct Agregate
{
enum Type
{
STRUCT,
ARRAY
};
Type type;
uint32_t align;
Agregate(Type t, uint32_t a): type(t), align(a) {}
};
//Agregate stack holds information about structs and their nesting (for automatic insertion of tail pad)
physx::shdfnd::Array<Agregate, Traits::Allocator> mStack;
public:
PlatformStream(const PlatformABI &targetParams, Traits *traits)
: mTraits(traits),
mTargetParams(targetParams),
mStack(Traits::Allocator(traits))
{
// TODO: constructors should not fail...
if( Serializer::ERROR_NONE != PlatformABI::GetPredefinedABI(GetCurrentPlatform(), mCurParams) )
{
PX_ALWAYS_ASSERT();
return;
}
}
//Array's copy constructor is broken so we implement it by hand
PlatformStream(const PlatformStream &s)
: mTraits(s.mTraits),
mTargetParams(s.mTargetParams),
mCurParams(s.mCurParams),
mStack(Traits::Allocator(s.mTraits))
{
mStack.reserve(s.mStack.size());
for(uint32_t i = 0; i < s.mStack.size(); ++i)
mStack.pushBack(s.mStack[i]);
}
void dump() const
{
printf("Dumping PlatformStream at %p:\n", this);
}
const PlatformABI &getTargetABI() const
{
return mTargetParams;
}
uint32_t getTargetSize(const Definition *pd) const
{
return mTargetParams.getSize(pd);
}
uint32_t getTargetAlignment(const Definition *pd) const
{
return mTargetParams.getAlignment(pd);
}
uint32_t getTargetPadding(const Definition *pd) const
{
return mTargetParams.getPadding(pd);
}
//Align offset to be n*border
PX_INLINE uint32_t getAlign(uint32_t off, uint32_t border, bool &isAligned) const
{
PX_ASSERT(border <= 128);
//Array members are not aligned
//See http://www.gamasutra.com/view/feature/3975/data_alignment_part_2_objects_on_.php
if( !mStack.empty() && Agregate::ARRAY == mStack.back().type )
{
isAligned = false;
return off;
}
isAligned = true;
const uint32_t mask = border - 1;
return (off + mask) & ~mask;
}
//Align offset to be n*border
PX_INLINE uint32_t getAlign(uint32_t off, uint32_t border) const
{
bool tmp;
return getAlign(off, border, tmp);
}
};
}
#endif
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