CWE-ou-minkata/Sources/Plasma/PubUtilLib/plPipeline/plVertCoder.cpp

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*==LICENSE==*/

#include "HeadSpin.h"
#include "plVertCoder.h"

#include "hsStream.h"
#include <cmath>
#include "plGBufferGroup.h"

const float kPosQuantum = 1.f / float(1 << 10);
const float kWeightQuantum = 1.f / float(1 << 15);
const float kUVWQuantum = 1.f / float(1 << 16);

uint32_t  plVertCoder::fCodedVerts = 0;
uint32_t  plVertCoder::fCodedBytes = 0;
uint32_t  plVertCoder::fRawBytes = 0;
uint32_t  plVertCoder::fSkippedBytes = 0;

static const float kQuanta[plVertCoder::kNumFloatFields] =
{
    kPosQuantum,
    kWeightQuantum,
    
    kUVWQuantum,
    kUVWQuantum,
    kUVWQuantum,
    kUVWQuantum,

    kUVWQuantum,
    kUVWQuantum,
    kUVWQuantum,
    kUVWQuantum,
};


inline void plVertCoder::ICountFloats(const uint8_t* src, uint16_t maxCnt, const float quant, const uint32_t stride, 
                                      float& lo, bool &allSame, uint16_t& count)
{
    lo = *(float*)src;
    lo = floor(lo / quant + 0.5f) * quant;
    allSame = false;
    float hi = lo;
    
    count = 1;

    const float maxRange = float(uint16_t(0xffff)) * quant;

    src += stride;
    maxCnt--;

    while( maxCnt-- )
    {
        float val = *(float*)src;
        val = floor(val / quant + 0.5f) * quant;
        if( val < lo )
        {
            if( hi - val > maxRange )
                return;
            lo = val;
        }
        else if( val > hi )
        {
            if( val - lo > maxRange )
                return;
            hi = val;
        }
        count++;
        src += stride;
    }
    allSame = (lo == hi);
}

static inline void IWriteFloat(hsStream* s, const uint8_t*& src, const float offset, const float quantum)
{
    float fval = *(float*)src;
    fval -= offset;
    fval /= quantum;
//  hsAssert(fval < float(uint16_t(0xffff)), "Bad offset?");

    const uint16_t ival = uint16_t(floor(fval + 0.5f));
    s->WriteLE16(ival);

    src += 4;
}

static inline void IReadFloat(hsStream* s, uint8_t*& dst, const float offset, const float quantum)
{
    const uint16_t ival = s->ReadLE16();
    float fval = float(ival) * quantum;
    fval += offset;

    float* val = (float*)dst;
    *val = fval;

    dst += 4;
}

inline void plVertCoder::IEncodeFloat(hsStream* s, const uint32_t vertsLeft, const int field, const int chan, const uint8_t*& src, const uint32_t stride)
{
    if( !fFloats[field][chan].fCount )
    {
        ICountFloats(src, (uint16_t)vertsLeft, kQuanta[field], stride, fFloats[field][chan].fOffset, fFloats[field][chan].fAllSame, fFloats[field][chan].fCount);

        s->WriteLEScalar(fFloats[field][chan].fOffset);
        s->WriteBool(fFloats[field][chan].fAllSame);
        s->WriteLE16(fFloats[field][chan].fCount);

    }
    if (!fFloats[field][chan].fAllSame)
        IWriteFloat(s, src, fFloats[field][chan].fOffset, kQuanta[field]);
    else
        src += 4;

    fFloats[field][chan].fCount--;
}

inline void plVertCoder::IDecodeFloat(hsStream* s, const int field, const int chan, uint8_t*& dst, const uint32_t stride)
{
    if( !fFloats[field][chan].fCount )
    {
        fFloats[field][chan].fOffset = s->ReadLEScalar();
        fFloats[field][chan].fAllSame = s->ReadBool();
        fFloats[field][chan].fCount = s->ReadLE16();
    }

    if (!fFloats[field][chan].fAllSame)
        IReadFloat(s, dst, fFloats[field][chan].fOffset, kQuanta[field]);
    else
    {
        *((float*)dst) = fFloats[field][chan].fOffset;
        dst += 4;
    }

    fFloats[field][chan].fCount--;
}

static inline int INumWeights(const uint8_t format)
{
    return (format & plGBufferGroup::kSkinWeightMask) >> 4;
}

static const float kNormalScale(int16_t(0x7fff));
static const float kInvNormalScale(1.f / kNormalScale);

inline void plVertCoder::IEncodeNormal(hsStream* s, const uint8_t*& src, const uint32_t stride)
{

    float x = *(float*)src;
    s->WriteByte((uint8_t)((x / 2.f + .5f) * 255.9f));
    src += 4;

    x = *(float*)src;
    s->WriteByte((uint8_t)((x / 2.f + .5f) * 255.9f));
    src += 4;

    x = *(float*)src;
    s->WriteByte((uint8_t)((x / 2.f + .5f) * 255.9f));
    src += 4;
}

inline void plVertCoder::IDecodeNormal(hsStream* s, uint8_t*& dst, const uint32_t stride)
{

    uint8_t ix = s->ReadByte();
    float* x = (float*)dst;
    *x = (ix / 255.9f - .5f) * 2.f;
    dst += 4;

    ix = s->ReadByte();
    x = (float*)dst;
    *x = (ix / 255.9f - .5f) * 2.f;
    dst += 4;

    ix = s->ReadByte();
    x = (float*)dst;
    *x = (ix / 255.9f - .5f) * 2.f;
    dst += 4;
}

inline void plVertCoder::ICountBytes(const uint32_t vertsLeft, const uint8_t* src, const uint32_t stride, uint16_t& len, uint8_t& same)
{
    // We want to run length encode this. So we're looking here for either
    // the number of consecutive bytes of the same value,
    // or the number of consective bytes of different values.
    // The latter is so we don't wind up getting larger when there aren't any 
    // runs of the same value (count=1 and val=c1, count=1 and val=c2, etc.).
    // The break-even point is a run of 3, so we'll look for a minimum run of 4.

    if( vertsLeft < 4 )
    {
        len = (uint16_t)vertsLeft;
        same = false;
        
        return;
    }

    // First, count how many values are the same as the first one
    int i;
    for( i = 0; i < vertsLeft; i++ )
    {
        if( src[i * stride] != src[0] )
            break;
    }

    if( i >= 4 )
    {
        // Found a good run.
        len = i;
        same = true;

        return;
    }

    // Okay, we're in a section of varying values. How far to the next 
    // section of sameness?
    same = false;
    for( ; i < vertsLeft-4; i++ )
    {
        if( (src[i*stride] == src[(i+1)*stride])
            &&(src[i*stride] == src[(i+2)*stride])
            &&(src[i*stride] == src[(i+3)*stride]) )
            break;
    }

    if( i < vertsLeft-4 )
    {
        len = i;
        return;
    }

    len = (uint16_t)vertsLeft;
    return;
}

static const uint16_t kSameMask(0x8000);

inline void plVertCoder::IEncodeByte(hsStream* s, const int chan, const uint32_t vertsLeft, const uint8_t*& src, const uint32_t stride)
{
    if( !fColors[chan].fCount )
    {
        ICountBytes(vertsLeft, src, stride, fColors[chan].fCount, fColors[chan].fSame);

        uint16_t cnt = fColors[chan].fCount;
        if( fColors[chan].fSame )
            cnt |= kSameMask;
        s->WriteLE16(cnt);

        if( fColors[chan].fSame )
            s->WriteByte(*src);
    }

    if( !fColors[chan].fSame )
        s->WriteByte(*src);
    
    src++;
    fColors[chan].fCount--;
}

inline void plVertCoder::IDecodeByte(hsStream* s, const int chan, uint8_t*& dst, const uint32_t stride)
{
    if( !fColors[chan].fCount )
    {
        uint16_t cnt = s->ReadLE16();
        if( cnt & kSameMask )
        {
            fColors[chan].fSame = true;
            fColors[chan].fVal = s->ReadByte();

            cnt &= ~kSameMask;
        }
        else
        {
            fColors[chan].fSame = false;
        }
        fColors[chan].fCount = cnt;
    }
    if( !fColors[chan].fSame )
        *dst = s->ReadByte();
    else
        *dst = fColors[chan].fVal;

    dst++;
    fColors[chan].fCount--;
}

inline void plVertCoder::IEncodeColor(hsStream* s, const uint32_t vertsLeft, const uint8_t*& src, const uint32_t stride)
{
    IEncodeByte(s, 0, vertsLeft, src, stride);
    IEncodeByte(s, 1, vertsLeft, src, stride);
    IEncodeByte(s, 2, vertsLeft, src, stride);
    IEncodeByte(s, 3, vertsLeft, src, stride);
}

inline void plVertCoder::IDecodeColor(hsStream* s, uint8_t*& dst, const uint32_t stride)
{
    IDecodeByte(s, 0, dst, stride);
    IDecodeByte(s, 1, dst, stride);
    IDecodeByte(s, 2, dst, stride);
    IDecodeByte(s, 3, dst, stride);
}

inline void plVertCoder::IEncode(hsStream* s, const uint32_t vertsLeft, const uint8_t*& src, const uint32_t stride, const uint8_t format)
{
    IEncodeFloat(s, vertsLeft, kPosition, 0, src, stride);
    IEncodeFloat(s, vertsLeft, kPosition, 1, src, stride);
    IEncodeFloat(s, vertsLeft, kPosition, 2, src, stride);

    // Weights and indices?
    const int numWeights = INumWeights(format);
    if( numWeights )
    {
        int j;
        for( j = 0; j < numWeights; j++ )
            IEncodeFloat(s, vertsLeft, kWeight, j, src, stride);

        if( format & plGBufferGroup::kSkinIndices )
        {
            const uint32_t idx = *(uint32_t*)src;
            s->WriteLE32(idx);
            src += 4;
        }
    }

    IEncodeNormal(s, src, stride);

    IEncodeColor(s, vertsLeft, src, stride);

    // COLOR2
    src += 4;

    const int numUVWs = format & plGBufferGroup::kUVCountMask;
    int i;
    for( i = 0; i < numUVWs; i++ )
    {
        IEncodeFloat(s, vertsLeft, kUVW + i, 0, src, stride);
        IEncodeFloat(s, vertsLeft, kUVW + i, 1, src, stride);
        IEncodeFloat(s, vertsLeft, kUVW + i, 2, src, stride);
    }
}

inline void plVertCoder::IDecode(hsStream* s, uint8_t*& dst, const uint32_t stride, const uint8_t format)
{
    IDecodeFloat(s, kPosition, 0, dst, stride);
    IDecodeFloat(s, kPosition, 1, dst, stride);
    IDecodeFloat(s, kPosition, 2, dst, stride);

    // Weights and indices?
    const int numWeights = INumWeights(format);
    if( numWeights )
    {
        int j;
        for( j = 0; j < numWeights; j++ )
            IDecodeFloat(s, kWeight, j, dst, stride);

        if( format & plGBufferGroup::kSkinIndices )
        {
            uint32_t* idx = (uint32_t*)dst;
            *idx = s->ReadLE32();
            dst += 4;
        }
    }

    IDecodeNormal(s, dst, stride);

    IDecodeColor(s, dst, stride);

    // COLOR2
    uint32_t* trash = (uint32_t*)dst;
    *trash = 0;
    dst += 4;

    const int numUVWs = format & plGBufferGroup::kUVCountMask;
    int i;
    for( i = 0; i < numUVWs; i++ )
    {
        IDecodeFloat(s, kUVW + i, 0, dst, stride);
        IDecodeFloat(s, kUVW + i, 1, dst, stride);
        IDecodeFloat(s, kUVW + i, 2, dst, stride);
    }
}

void plVertCoder::Read(hsStream* s, uint8_t* dst, const uint8_t format, const uint32_t stride, const uint16_t numVerts)
{
    Clear();

    int i = numVerts;
    for( i = 0; i < numVerts; i++ )
        IDecode(s, dst, stride, format);
}


void plVertCoder::Write(hsStream* s, const uint8_t* src, const uint8_t format, const uint32_t stride, const uint16_t numVerts)
{
    Clear();

    uint32_t streamStart = s->GetPosition();

    int numLeft = numVerts;
    while( numLeft )
    {
        IEncode(s, numLeft, src, stride, format);
        numLeft--;
    }

    fCodedVerts += numVerts;
    fCodedBytes += (s->GetPosition() - streamStart);
    fRawBytes += numVerts * stride;
}

plVertCoder::plVertCoder()
{
    Clear();
}

plVertCoder::~plVertCoder()
{
}

void plVertCoder::Clear()
{
    memset(this, 0, sizeof(*this));
}