PxcNpCache.h

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// Copyright (c) 2004-2008 AGEIA Technologies, Inc. All rights reserved.
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#ifndef PXC_NP_CACHE_H
#define PXC_NP_CACHE_H
 
#include "foundation/PxMemory.h"
#include "foundation/PxIntrinsics.h"
#include "foundation/PxPool.h"
#include "foundation/PxUtilities.h"
 
#include "PxcNpCacheStreamPair.h"
 
#include "GuContactMethodImpl.h"
 
namespace physx
{
 
template <typename T>
void PxcNpCacheWrite(PxcNpCacheStreamPair& streams,
                     Gu::Cache& cache,
                     const T& payload,
                     PxU32 bytes, 
                     const PxU8* data)
{
    const PxU32 payloadSize = (sizeof(payload)+3)&~3;
    cache.mCachedSize = PxTo16((payloadSize + 4 + bytes + 0xF)&~0xF);
 
    PxU8* ls = streams.reserve(cache.mCachedSize);
    cache.mCachedData = ls;
    if(ls==NULL || (reinterpret_cast<PxU8*>(-1))==ls)
    {
        if(ls==NULL)
        {
            PX_WARN_ONCE(
                "Reached limit set by PxSceneDesc::maxNbContactDataBlocks - ran out of buffer space for narrow phase. "
                "Either accept dropped contacts or increase buffer size allocated for narrow phase by increasing PxSceneDesc::maxNbContactDataBlocks.");
            return;
        }
        else
        {
            PX_WARN_ONCE(
                "Attempting to allocate more than 16K of contact data for a single contact pair in narrowphase. "
                "Either accept dropped contacts or simplify collision geometry.");
            cache.mCachedData = NULL;
            ls = NULL;
            return;
        }
    }
 
    *reinterpret_cast<T*>(ls) = payload;
    *reinterpret_cast<PxU32*>(ls+payloadSize) = bytes;
    if(data)
        PxMemCopy(ls+payloadSize+sizeof(PxU32), data, bytes);
}
 
 
template <typename T>
PxU8* PxcNpCacheWriteInitiate(PxcNpCacheStreamPair& streams, Gu::Cache& cache, const T& payload, PxU32 bytes)
{
    PX_UNUSED(payload);
 
    const PxU32 payloadSize = (sizeof(payload)+3)&~3;
    cache.mCachedSize = PxTo16((payloadSize + 4 + bytes + 0xF)&~0xF);
 
    PxU8* ls = streams.reserve(cache.mCachedSize);
    cache.mCachedData = ls;
    if(NULL==ls || reinterpret_cast<PxU8*>(-1)==ls)
    {
        if(NULL==ls)
        {
            PX_WARN_ONCE(
                "Reached limit set by PxSceneDesc::maxNbContactDataBlocks - ran out of buffer space for narrow phase. "
                "Either accept dropped contacts or increase buffer size allocated for narrow phase by increasing PxSceneDesc::maxNbContactDataBlocks.");
        }
        else
        {
            PX_WARN_ONCE(
                "Attempting to allocate more than 16K of contact data for a single contact pair in narrowphase. "
                "Either accept dropped contacts or simplify collision geometry.");
            cache.mCachedData = NULL;
            ls = NULL;
        }
    }
    return ls;
}
 
template <typename T>
PX_FORCE_INLINE void PxcNpCacheWriteFinalize(PxU8* ls, const T& payload, PxU32 bytes, const PxU8* data)
{
    const PxU32 payloadSize = (sizeof(payload)+3)&~3;
    *reinterpret_cast<T*>(ls) = payload;
    *reinterpret_cast<PxU32*>(ls+payloadSize) = bytes;
    if(data)
        PxMemCopy(ls+payloadSize+sizeof(PxU32), data, bytes);
}
 
 
template <typename T>
PX_FORCE_INLINE PxU8* PxcNpCacheRead(Gu::Cache& cache, T*& payload)
{
    PxU8* ls = cache.mCachedData;
    payload = reinterpret_cast<T*>(ls);
    const PxU32 payloadSize = (sizeof(T)+3)&~3;
    return reinterpret_cast<PxU8*>(ls+payloadSize+sizeof(PxU32));
}
 
template <typename T>
const PxU8* PxcNpCacheRead2(Gu::Cache& cache, T& payload, PxU32& bytes)
{
    const PxU8* ls = cache.mCachedData;
    if(ls==NULL)
    {
        bytes = 0;
        return NULL;
    }
 
    const PxU32 payloadSize = (sizeof(payload)+3)&~3;
    payload = *reinterpret_cast<const T*>(ls);
    bytes = *reinterpret_cast<const PxU32*>(ls+payloadSize);
    PX_ASSERT(cache.mCachedSize == ((payloadSize + 4 + bytes+0xF)&~0xF));
    return reinterpret_cast<const PxU8*>(ls+payloadSize+sizeof(PxU32));
}
 
}
 
#endif