CWE-ou-minkata/Sources/Plasma/PubUtilLib/plDrawable/plSpanInstance.cpp

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*==LICENSE==*/

#include "HeadSpin.h"
#include "plSpanInstance.h"

#include "hsGeometry3.h"
#include "hsStream.h"

void plSpanEncoding::Read(hsStream* s)
{
    fCode = s->ReadByte();
    fPosScale = s->ReadLEScalar();
}

void plSpanEncoding::Write(hsStream* s) const
{
    s->WriteByte((uint8_t)fCode);
    s->WriteLEScalar(fPosScale);
}


plSpanInstance::plSpanInstance()
:   fPosDelta(nil),
    fCol(nil)
{
    fL2W[0][1] = fL2W[0][2] = 0.f;
    fL2W[1][0] = fL2W[1][2] = 0.f;
    fL2W[2][0] = fL2W[2][1] = 0.f;
    fL2W[0][0] = fL2W[1][1] = fL2W[2][2] = 1.f;
}

plSpanInstance::~plSpanInstance()
{
    DeAlloc();
}

void plSpanInstance::DeAlloc()
{
    delete [] fPosDelta;
    fPosDelta = nil;
    delete [] fCol;
    fCol = nil;
}

void plSpanInstance::Alloc(const plSpanEncoding& encoding, uint32_t numVerts)
{
    DeAlloc();
    uint32_t posStride = PosStrideFromEncoding(encoding);
    if( posStride )
        fPosDelta = new uint8_t[numVerts * posStride];

    uint32_t colStride = ColStrideFromEncoding(encoding);
    if( colStride )
        fCol = new uint8_t[numVerts * colStride];
}

void plSpanInstance::Read(hsStream* stream, const plSpanEncoding& encoding, uint32_t numVerts)
{
    Alloc(encoding, numVerts);

    stream->Read(12 * sizeof(float), fL2W[0]);
    if( fPosDelta )
    {
        stream->Read(numVerts * PosStrideFromEncoding(encoding), fPosDelta);
    }

    if( fCol )
    {
        stream->Read(numVerts * ColStrideFromEncoding(encoding), fCol);
    }
}

void plSpanInstance::Write(hsStream* stream, const plSpanEncoding& encoding, uint32_t numVerts) const
{
    stream->Write(12 * sizeof(float), fL2W[0]);
    if( fPosDelta )
    {
        stream->Write(numVerts * PosStrideFromEncoding(encoding), fPosDelta);
    }
    if( fCol )
    {
        stream->Write(numVerts * ColStrideFromEncoding(encoding), fCol);
    }
}

hsMatrix44 plSpanInstance::LocalToWorld() const
{
    hsMatrix44 retVal;
    retVal.NotIdentity();
    int i;
    for( i = 0; i < 3; i++ )
    {
        int j;
        for( j = 0; j < 4; j++ )
        {
            retVal.fMap[i][j] = fL2W[i][j];
        }
    }
    retVal.fMap[3][0] =
        retVal.fMap[3][1] =
        retVal.fMap[3][2] = 0.f;
    retVal.fMap[3][3] = 1.f;

    return retVal;
}

hsMatrix44 plSpanInstance::WorldToLocal() const
{
    hsMatrix44 l2w = LocalToWorld();
    hsMatrix44 w2l;
    l2w.GetInverse(&w2l);
    return w2l;
}

void plSpanInstance::SetLocalToWorld(const hsMatrix44& l2w)
{
    int i;
    for( i = 0; i < 3; i++ )
    {
        int j;
        for( j = 0; j < 4; j++ )
        {
            fL2W[i][j] = l2w.fMap[i][j];
        }
    }
}

void plSpanInstance::Encode(const plSpanEncoding& encoding, uint32_t numVerts, const hsVector3* delPos, const uint32_t* color)
{
    Alloc(encoding, numVerts);

    hsAssert(!(encoding.fCode & plSpanEncoding::kPosMask) == !delPos, "Position encoding mismatch");
    hsAssert(!(encoding.fCode & plSpanEncoding::kColMask) == !color, "Color encoding mismatch");

    // Check that there's anything to encode.
    if( !(fPosDelta || fCol) )
        return;

    int8_t* pos888 = (int8_t*)fPosDelta;
    int16_t* pos161616 = (int16_t*)fPosDelta;
    uint32_t* pos101010 = (uint32_t*)fPosDelta;

    uint8_t* col8 = (uint8_t*)fCol;
    uint16_t* col16 = (uint16_t*)fCol;
    uint32_t* col32 = (uint32_t*)fCol;
    int i;
    for( i = 0; i < numVerts; i++ )
    {
        switch(encoding.fCode & plSpanEncoding::kPosMask)
        {
        case plSpanEncoding::kPos888:
            pos888[0] = int8_t(delPos->fX / encoding.fPosScale);
            pos888[1] = int8_t(delPos->fY / encoding.fPosScale);
            pos888[2] = int8_t(delPos->fZ / encoding.fPosScale);
            pos888 += 3;
            delPos++;
            break;
        case plSpanEncoding::kPos161616:
            pos161616[0] = int16_t(delPos->fX / encoding.fPosScale);
            pos161616[1] = int16_t(delPos->fY / encoding.fPosScale);
            pos161616[2] = int16_t(delPos->fZ / encoding.fPosScale);
            pos161616 += 3;
            delPos++;
            break;
        case plSpanEncoding::kPos101010:
            *pos101010 =
                ((uint32_t(delPos->fX / encoding.fPosScale) & 0x3f) << 0)
                | ((uint32_t(delPos->fY / encoding.fPosScale) & 0x3f) << 10)
                | ((uint32_t(delPos->fZ / encoding.fPosScale) & 0x3f) << 20);
            pos101010++;
            delPos++;
            break;
        case plSpanEncoding::kPos008:
            *pos888 = int8_t(delPos->fZ / encoding.fPosScale);
            pos888++;
            delPos++;
            break;
        case plSpanEncoding::kPosNone:
        default:
            break;
        }
        switch(encoding.fCode & plSpanEncoding::kColMask)
        {
        case plSpanEncoding::kColA8:
            *col8 = (uint8_t)((*color) >> 24);
            col8++;
            color++;
            break;
        case plSpanEncoding::kColI8:
            *col8 = (uint8_t)((*color) & 0xff);
            col8++;
            color++;
            break;
        case plSpanEncoding::kColAI88:
            *col16 = (uint16_t)(((*color) >> 16) & 0xffff);
            col16++;
            color++;
            break;
        case plSpanEncoding::kColRGB888:
            *col8++ = (uint8_t)((*color >> 16) & 0xff);
            *col8++ = (uint8_t)((*color >> 8) & 0xff);
            *col8++ = (uint8_t)((*color >> 0) & 0xff);
            color++;
            break;
        case plSpanEncoding::kColARGB8888:
            *col32++ = *color;
            color++;
            break;
        case plSpanEncoding::kColNone:
        default:
            break;
        }
    }
}