/*==LICENSE==*

CyanWorlds.com Engine - MMOG client, server and tools
Copyright (C) 2011  Cyan Worlds, Inc.

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
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but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.

Additional permissions under GNU GPL version 3 section 7

If you modify this Program, or any covered work, by linking or
combining it with any of RAD Game Tools Bink SDK, Autodesk 3ds Max SDK,
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 or by snail mail at:
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*==LICENSE==*/
//////////////////////////////////////////////////////////////////////////////
//                                                                          //
//  plDrawableGenerator Class Functions                                     //
//                                                                          //
//// Version History /////////////////////////////////////////////////////////
//                                                                          //
//  5.15.2001 mcn - Created.                                                //
//                                                                          //
//////////////////////////////////////////////////////////////////////////////

#include "hsTypes.h"
#include "plDrawableGenerator.h"
#include "plDrawableSpans.h"
#include "plGeometrySpan.h"
#include "hsFastMath.h"
#include "plRenderLevel.h"
#include "hsResMgr.h"
#include "pnKeyedObject/plUoid.h"

// Making light white and dark black by default, because this is really
// redundant. The handling of what color unlit and fully lit map to is
// encapsulated in the material used to draw the mesh. The caller
// wants illumination values, and can handle on screen contrast 
// through the material. mf
hsColorRGBA         plDrawableGenerator::fLiteColor = { 1, 1, 1, 1 };
hsColorRGBA         plDrawableGenerator::fDarkColor = { 0.0, 0.0, 0.0, 1 };


//// SetFauxLightColors //////////////////////////////////////////////////////
//  Set the colors for the foux lighting on generated drawables

void    plDrawableGenerator::SetFauxLightColors( hsColorRGBA &lite, hsColorRGBA &dark )
{
    fLiteColor = lite;
    fDarkColor = dark;
}

//// IQuickShadeVerts ////////////////////////////////////////////////////////
//  Quickly shades vertices based on a fake directional light. Good for doing
//  faux shadings on proxy objects.

void    plDrawableGenerator::IQuickShadeVerts( UInt32 count, hsVector3 *normals, hsColorRGBA *colors, hsColorRGBA* origColors, const hsColorRGBA* multColor )
{
    hsVector3       lightDir;
    float           scale;


    lightDir.Set( 1, 1, 1 );
    lightDir.Normalize();

    while( count-- )
    {
        scale = ( normals[ count ] * lightDir );
        // pretend there are two opposing directional lights, but the
        // one pointing downish is a little stronger.
        const hsScalar kReverseLight = -0.8f;
        if( scale < 0 )
            scale = kReverseLight * scale;
        colors[ count ] = fLiteColor * scale + fDarkColor * ( 1.f - scale );
        if( origColors )
            colors[ count ] *= origColors[ count ];
        if( multColor )
            colors[ count ] *= *multColor;
    }
}

void plDrawableGenerator::IFillSpan( UInt32 vertCount, hsPoint3 *positions, hsVector3 *normals, 
                                                            hsPoint3 *uvws, UInt32 uvwsPerVtx, 
                                                            hsColorRGBA *origColors, hsBool fauxShade, const hsColorRGBA* multColor,
                                                            UInt32 numIndices, UInt16 *indices, 
                                                            hsGMaterial *material, const hsMatrix44 &localToWorld, hsBool blended,
                                                            plGeometrySpan* span )
{
    hsTArray<hsVector3>         myNormals;


    /// Calculate normals if we don't have them
    if( normals == nil )
    {
        int         i;
        hsVector3   normal, v1, v2;

        myNormals.SetCount( vertCount );
        for( i = 0; i < vertCount; i++ )
            myNormals[ i ].Set( 0, 0, 0 );

        for( i = 0; i < numIndices; i += 3 )
        {
            v1.Set( &positions[ indices[ i + 1 ] ], &positions[ indices[ i ] ] );
            v2.Set( &positions[ indices[ i + 2 ] ], &positions[ indices[ i ] ] );

            normal = v1 % v2;
            myNormals[ indices[ i ] ] += normal;
            myNormals[ indices[ i + 1 ] ] += normal;
            myNormals[ indices[ i + 2 ] ] += normal;
        }

        for( i = 0; i < vertCount; i++ )
            myNormals[ i ].Normalize();

        normals = myNormals.AcquireArray();
    }

    if( uvws == nil )
        uvwsPerVtx = 0;
    span->BeginCreate( material, localToWorld, plGeometrySpan::UVCountToFormat( (UInt8)uvwsPerVtx ) );

    if( !origColors && !fauxShade )
        span->AddVertexArray( vertCount, positions, normals, nil, uvws, uvwsPerVtx );
    else
    {
        hsTArray<hsColorRGBA> colArray;

        hsColorRGBA* colors;
        if( fauxShade )
        {
            colArray.SetCount(vertCount);
            IQuickShadeVerts( vertCount, normals, colArray.AcquireArray(), origColors, multColor );
            colors = colArray.AcquireArray();
        }
        else // just use the origColors
        {
            colors = origColors;
        }


        hsTArray<UInt32>    tempColors;
        int                 i;
        UInt8               a, r, g, b;


        tempColors.SetCount( vertCount );
        for( i = 0; i < vertCount; i++ )
        {
            hsColorRGBA *color = &colors[ i ];
            a = (UInt8)( color->a >= 1 ? 255 : color->a <= 0 ? 0 : color->a * 255.0 );
            r = (UInt8)( color->r >= 1 ? 255 : color->r <= 0 ? 0 : color->r * 255.0 );
            g = (UInt8)( color->g >= 1 ? 255 : color->g <= 0 ? 0 : color->g * 255.0 );
            b = (UInt8)( color->b >= 1 ? 255 : color->b <= 0 ? 0 : color->b * 255.0 );
            
            tempColors[ i ] = ( a << 24 ) | ( r << 16 ) | ( g << 8 ) | ( b );
        }

        span->AddVertexArray( vertCount, positions, normals, tempColors.AcquireArray(), uvws, uvwsPerVtx );
    }

    span->AddIndexArray( numIndices, indices );
    span->EndCreate();


}

//// RegenerateDrawable ////////////////////////////////////////////////////////
//  Static function that refills an existing drawable based on the vertex/index
//  data given. That data had better match the data the drawable was first filled
//  with (i.e. vertex/index count

hsBool plDrawableGenerator::RegenerateDrawable( UInt32 vertCount, hsPoint3 *positions, hsVector3 *normals, 
                                                            hsPoint3 *uvws, UInt32 uvwsPerVtx, 
                                                            hsColorRGBA *origColors, hsBool fauxShade, const hsColorRGBA* multColor,
                                                            UInt32 numIndices, UInt16 *indices, 
                                                            hsGMaterial *material, const hsMatrix44 &localToWorld, hsBool blended,
                                                            UInt32 diIndex, plDrawableSpans *destDraw )
{
    plDISpanIndex spanList = destDraw->GetDISpans( diIndex );
    if( spanList.GetCount() != 1 )
    {
        hsAssert(false, "Don't know how to distribute this geometry over multiple spans");
        return false;
    }
    plGeometrySpan* span = destDraw->GetGeometrySpan(spanList[0]);

    if( (span->fNumVerts != vertCount)
        ||(span->fNumIndices != numIndices) )
    {
        hsAssert(false, "Mismatched data coming in for a refill");
        return false;
    }
    IFillSpan( vertCount, positions, normals, 
                                uvws, uvwsPerVtx, 
                                origColors, fauxShade, multColor,
                                numIndices, indices, 
                                material, localToWorld, blended,
                                span );

    destDraw->RefreshDISpans( diIndex );

    return true;
}


//// GenerateDrawable ////////////////////////////////////////////////////////
//  Static function that creates a new drawable based on the vertex/index
//  data given.

plDrawableSpans *plDrawableGenerator::GenerateDrawable( UInt32 vertCount, hsPoint3 *positions, hsVector3 *normals, 
                                                            hsPoint3 *uvws, UInt32 uvwsPerVtx, 
                                                            hsColorRGBA *origColors, hsBool fauxShade, const hsColorRGBA* multColor,
                                                            UInt32 numIndices, UInt16 *indices, 
                                                            hsGMaterial *material, const hsMatrix44 &localToWorld, hsBool blended,
                                                            hsTArray<UInt32> *retIndex, plDrawableSpans *toAddTo )
{
    plDrawableSpans             *newDraw;
    hsTArray<plGeometrySpan *>  spanArray;
    plGeometrySpan              *span;

    // Set up props on the new drawable
    if( toAddTo != nil )
        newDraw = toAddTo;
    else
    {
        newDraw = TRACKED_NEW plDrawableSpans;
//      newDraw->SetNativeProperty( plDrawable::kPropVolatile, true );
        if( blended )
        {
            newDraw->SetRenderLevel(plRenderLevel(plRenderLevel::kBlendRendMajorLevel, plRenderLevel::kDefRendMinorLevel));
            newDraw->SetNativeProperty( plDrawable::kPropSortSpans | plDrawable::kPropSortFaces, true );
        }

        static int nameIdx = 0;
        char buff[256];
        sprintf(buff, "%s_%d", "GenDrawable", nameIdx++);
        hsgResMgr::ResMgr()->NewKey( buff, newDraw, plLocation::kGlobalFixedLoc );
    }

    // Create a temp plGeometrySpan
    spanArray.SetCount( 1 );
    span = spanArray[ 0 ] = TRACKED_NEW plGeometrySpan;

    IFillSpan( vertCount, positions, normals, 
                                uvws, uvwsPerVtx, 
                                origColors, fauxShade, multColor,
                                numIndices, indices, 
                                material, localToWorld, blended,
                                span );

    /// Now add the span to the new drawable, clear up the span's buffers and return!
    UInt32 trash = UInt32(-1);
    UInt32 idx = newDraw->AppendDISpans( spanArray, trash, false );
    if( retIndex != nil )
        retIndex->Append(idx);

    return newDraw;
}

//// GenerateSphericalDrawable ///////////////////////////////////////////////

plDrawableSpans     *plDrawableGenerator::GenerateSphericalDrawable( const hsPoint3& pos, hsScalar radius, hsGMaterial *material, 
                                                                    const hsMatrix44 &localToWorld, hsBool blended,
                                                                    const hsColorRGBA* multColor,
                                                                    hsTArray<UInt32> *retIndex, plDrawableSpans *toAddTo, 
                                                                    hsScalar qualityScalar )
{
    hsTArray<hsPoint3>      points;
    hsTArray<hsVector3>     normals;
    hsTArray<UInt16>        indices;
    hsTArray<hsColorRGBA>   colors;
    hsPoint3                point;
    hsVector3               normal;

    int                 i, j, numDivisions, start;
    float               angle, z, x, y, internRad;
    plDrawableSpans     *drawable;


    numDivisions = (int)( radius * qualityScalar / 10.f );
    if( numDivisions < 5 )
        numDivisions = 5;
    else if( numDivisions > 30 )
        numDivisions = 30;


    /// Generate points
    for( i = 0; i <= numDivisions; i++ )
    {
        angle = (float)i * ( hsScalarPI ) / (float)numDivisions;
        hsFastMath::SinCosInRange( angle, internRad, z );
        internRad *= radius;
                
        for( j = 0; j < numDivisions; j++ )
        {
            angle = (float)j * ( 2 * hsScalarPI ) / (float)numDivisions;
            hsFastMath::SinCosInRange( angle, x, y );

            point.Set( pos.fX + x * internRad, pos.fY + y * internRad, pos.fZ + z * radius );
            normal.Set( x * internRad, y * internRad, z * radius );
            normal.Normalize();

            points.Append( point );
            normals.Append( normal );
        }
    }

    /// Generate indices
    for( i = 0, start = 0; i < numDivisions; i++, start += numDivisions )
    {
        for( j = 0; j < numDivisions - 1; j++ )
        {
            indices.Append( start + j );
            indices.Append( start + j + 1 );
            indices.Append( start + j + numDivisions + 1 );

            indices.Append( start + j );
            indices.Append( start + j + numDivisions + 1 );
            indices.Append( start + j + numDivisions );
        }

        indices.Append( start + j );
        indices.Append( start );
        indices.Append( start + numDivisions );

        indices.Append( start + j );
        indices.Append( start + numDivisions );
        indices.Append( start + j + numDivisions );
    }

    /// Create a drawable for it
    drawable = plDrawableGenerator::GenerateDrawable( points.GetCount(), points.AcquireArray(), normals.AcquireArray(),
                                                        nil, 0,
                                                        nil, true, multColor,
                                                        indices.GetCount(), indices.AcquireArray(),
                                                        material, localToWorld, blended, retIndex, toAddTo );

    return drawable;
}

//// GenerateBoxDrawable /////////////////////////////////////////////////////

plDrawableSpans     *plDrawableGenerator::GenerateBoxDrawable( hsScalar width, hsScalar height, hsScalar depth, 
                                                                hsGMaterial *material, const hsMatrix44 &localToWorld, hsBool blended,
                                                                const hsColorRGBA* multColor,
                                                                hsTArray<UInt32> *retIndex, plDrawableSpans *toAddTo )
{
    hsVector3       xVec, yVec, zVec;
    hsPoint3        pt;


    xVec.Set( width, 0, 0 );
    yVec.Set( 0, height, 0 );
    zVec.Set( 0, 0, depth );

    pt.Set( -width / 2.f, -height / 2.f, -depth / 2.f );

    return GenerateBoxDrawable( pt, xVec, yVec, zVec, material, localToWorld, blended, multColor, retIndex, toAddTo );
}

//// GenerateBoxDrawable /////////////////////////////////////////////////////
//  Version that takes a corner and three vectors, for x, y and z edges.

#define CALC_NORMAL( nA, xVec, yVec, zVec ) { hsVector3 n = (xVec) + (yVec) + (zVec); n = -n; n.Normalize(); nA.Append( n ); }

plDrawableSpans     *plDrawableGenerator::GenerateBoxDrawable( const hsPoint3 &corner, const hsVector3 &xVec, const hsVector3 &yVec, const hsVector3 &zVec, 
                                                                hsGMaterial *material, const hsMatrix44 &localToWorld, hsBool blended,
                                                                const hsColorRGBA* multColor,
                                                                hsTArray<UInt32> *retIndex, plDrawableSpans *toAddTo )
{
    hsTArray<hsPoint3>      points;
    hsTArray<hsVector3>     normals;
    hsTArray<UInt16>        indices;
    hsTArray<hsColorRGBA>   colors;
    hsTArray<hsPoint3>      uvws;
    hsPoint3                point;

    plDrawableSpans     *drawable;
    float               mults[ 8 ][ 3 ] = { { -1, -1, -1 }, { 1, -1, -1 }, { 1, 1, -1 }, { -1, 1, -1 },
                                            { -1, -1,  1 }, { 1, -1,  1 }, { 1, 1,  1 }, { -1, 1,  1 } };



    /// Generate points and normals
    points.Expand( 8 );
    normals.Expand( 8 );

    point = corner;                 points.Append( point );
    point += xVec;                  points.Append( point );
    point += yVec;                  points.Append( point );
    point = corner + yVec;          points.Append( point );
    point = corner + zVec;          points.Append( point );
    point += xVec;                  points.Append( point );
    point += yVec;                  points.Append( point );
    point = corner + zVec + yVec;   points.Append( point );

    CALC_NORMAL( normals, xVec, yVec, zVec );
    CALC_NORMAL( normals, -xVec, yVec, zVec );
    CALC_NORMAL( normals, -xVec, -yVec, zVec );
    CALC_NORMAL( normals, xVec, -yVec, zVec );
    CALC_NORMAL( normals, xVec, yVec, -zVec );
    CALC_NORMAL( normals, -xVec, yVec, -zVec );
    CALC_NORMAL( normals, -xVec, -yVec, -zVec );
    CALC_NORMAL( normals, xVec, -yVec, -zVec );

    uvws.Expand( 8 );
    uvws.Append( hsPoint3( 0.f, 1.f, 0.f ) );
    uvws.Append( hsPoint3( 1.f, 1.f, 0.f ) );
    uvws.Append( hsPoint3( 1.f, 0.f, 0.f ) );
    uvws.Append( hsPoint3( 0.f, 0.f, 0.f ) );
    uvws.Append( hsPoint3( 1.f, 1.f, 0.f ) );
    uvws.Append( hsPoint3( 1.f, 0.f, 0.f ) );
    uvws.Append( hsPoint3( 0.f, 0.f, 0.f ) );
    uvws.Append( hsPoint3( 0.f, 1.f, 0.f ) );

    /// Generate indices
    indices.Expand( 36 );
    indices.Append( 0 ); indices.Append( 1 ); indices.Append( 2 );
    indices.Append( 0 ); indices.Append( 2 ); indices.Append( 3 );

    indices.Append( 1 ); indices.Append( 0 ); indices.Append( 4 );
    indices.Append( 1 ); indices.Append( 4 ); indices.Append( 5 );

    indices.Append( 2 ); indices.Append( 1 ); indices.Append( 5 );
    indices.Append( 2 ); indices.Append( 5 ); indices.Append( 6 );

    indices.Append( 3 ); indices.Append( 2 ); indices.Append( 6 );
    indices.Append( 3 ); indices.Append( 6 ); indices.Append( 7 );

    indices.Append( 0 ); indices.Append( 3 ); indices.Append( 7 );
    indices.Append( 0 ); indices.Append( 7 ); indices.Append( 4 );

    indices.Append( 7 ); indices.Append( 6 ); indices.Append( 5 );
    indices.Append( 7 ); indices.Append( 5 ); indices.Append( 4 );

    /// Create a drawable for it
    drawable = plDrawableGenerator::GenerateDrawable( points.GetCount(), points.AcquireArray(), normals.AcquireArray(),
                                                        uvws.AcquireArray(), 1,
                                                        nil, true, multColor,
                                                        indices.GetCount(), indices.AcquireArray(),
                                                        material, localToWorld, blended, retIndex, toAddTo );

    return drawable;
}


//// GenerateBoundsDrawable //////////////////////////////////////////////////

plDrawableSpans     *plDrawableGenerator::GenerateBoundsDrawable( hsBounds3Ext *bounds,
                                                                    hsGMaterial *material, const hsMatrix44 &localToWorld, hsBool blended,
                                                                    const hsColorRGBA* multColor,
                                                                    hsTArray<UInt32> *retIndex, plDrawableSpans *toAddTo )
{
    hsTArray<hsPoint3>      points;
    hsTArray<hsVector3>     normals;
    hsTArray<UInt16>        indices;
    hsTArray<hsColorRGBA>   colors;
    hsPoint3                point;
    hsVector3               normal;

    int                 i;
    plDrawableSpans     *drawable;
    float               mults[ 8 ][ 3 ] = { { -1, -1, -1 }, { 1, -1, -1 }, { 1, 1, -1 }, { -1, 1, -1 },
                                            { -1, -1,  1 }, { 1, -1,  1 }, { 1, 1,  1 }, { -1, 1,  1 } };


    /// Generate points and normals
    points.Expand( 8 );
    normals.Expand( 8 );
    hsPoint3 min = bounds->GetMins();
    hsPoint3 max = bounds->GetMaxs();

    for( i = 0; i < 8; i++ )
    {
        points.Append( hsPoint3( mults[ i ][ 0 ] > 0 ? max.fX : min.fX,
                                 mults[ i ][ 1 ] > 0 ? max.fY : min.fY,
                                 mults[ i ][ 2 ] > 0 ? max.fZ : min.fZ ) );
        normals.Append( hsVector3( mults[ i ][ 0 ], mults[ i ][ 1 ], mults[ i ][ 2 ] ) );
    }

    /// Generate indices
    indices.Expand( 36 );
    indices.Append( 0 ); indices.Append( 1 ); indices.Append( 2 );
    indices.Append( 0 ); indices.Append( 2 ); indices.Append( 3 );

    indices.Append( 1 ); indices.Append( 0 ); indices.Append( 4 );
    indices.Append( 1 ); indices.Append( 4 ); indices.Append( 5 );

    indices.Append( 2 ); indices.Append( 1 ); indices.Append( 5 );
    indices.Append( 2 ); indices.Append( 5 ); indices.Append( 6 );

    indices.Append( 3 ); indices.Append( 2 ); indices.Append( 6 );
    indices.Append( 3 ); indices.Append( 6 ); indices.Append( 7 );

    indices.Append( 0 ); indices.Append( 3 ); indices.Append( 7 );
    indices.Append( 0 ); indices.Append( 7 ); indices.Append( 4 );

    indices.Append( 7 ); indices.Append( 6 ); indices.Append( 5 );
    indices.Append( 7 ); indices.Append( 5 ); indices.Append( 4 );

    /// Create a drawable for it
    drawable = plDrawableGenerator::GenerateDrawable( points.GetCount(), points.AcquireArray(), normals.AcquireArray(),
                                                        nil, 0,
                                                        nil, true, multColor,
                                                        indices.GetCount(), indices.AcquireArray(),
                                                        material, localToWorld, blended, retIndex, toAddTo );

    return drawable;
}

//// GenerateConicalDrawable /////////////////////////////////////////////////

plDrawableSpans     *plDrawableGenerator::GenerateConicalDrawable( hsScalar radius, hsScalar height, hsGMaterial *material, 
                                                                    const hsMatrix44 &localToWorld, hsBool blended,
                                                                    const hsColorRGBA* multColor,
                                                                    hsTArray<UInt32> *retIndex, plDrawableSpans *toAddTo )
{
    hsVector3   direction;


    direction.Set( 0, 0, height );

    hsPoint3 zero(0, 0, 0);
    return GenerateConicalDrawable(zero, direction, radius, material, localToWorld, blended,
                                    multColor, retIndex, toAddTo );
}


//// GenerateConicalDrawable /////////////////////////////////////////////////

plDrawableSpans     *plDrawableGenerator::GenerateConicalDrawable( hsPoint3 &apex, hsVector3 &direction, hsScalar radius, hsGMaterial *material, 
                                                                    const hsMatrix44 &localToWorld, hsBool blended,
                                                                    const hsColorRGBA* multColor,
                                                                    hsTArray<UInt32> *retIndex, plDrawableSpans *toAddTo )
{
    hsTArray<hsPoint3>      points;
    hsTArray<hsVector3>     normals;
    hsTArray<UInt16>        indices;
    hsTArray<hsColorRGBA>   colors;
    hsPoint3                point;
    hsVector3               normal;

    int                 i, numDivisions;
    float               angle, x, y;
    plDrawableSpans     *drawable;


    numDivisions = (int)( radius / 4.f );
    if( numDivisions < 6 )
        numDivisions = 6;
    else if( numDivisions > 20 )
        numDivisions = 20;


    /// First, we need a few more vectors--specifically, the x and y vectors for the cone's base
    hsPoint3    baseCenter = apex + direction;
    hsVector3   xVec, yVec;

    xVec.Set( 1, 0, 0 );
    yVec = xVec % direction;
    if( yVec.MagnitudeSquared() == 0 )
    {
        xVec.Set( 0, 1, 0 );
        yVec = xVec % direction;
        hsAssert( yVec.MagnitudeSquared() != 0, "Weird funkiness when doing this!!!" );
    }

    xVec = yVec % direction;
    xVec.Normalize();
    yVec.Normalize();

    /// Now generate points based on those
    points.Expand( numDivisions + 2 );
    normals.Expand( numDivisions + 2 );

    points.Append( apex );
    normals.Append( -direction );
    for( i = 0; i < numDivisions; i++ )
    {
        angle = (float)i * ( hsScalarPI * 2.f ) / (float)numDivisions;
        hsFastMath::SinCosInRange( angle, x, y );

        points.Append( baseCenter + ( xVec * x * radius ) + ( yVec * y * radius ) );
        normals.Append( ( xVec * x ) + ( yVec * y ) );
    }

    /// Generate indices
    indices.Expand( ( numDivisions + 1 + numDivisions - 2 ) * 3 );
    for( i = 0; i < numDivisions - 1; i++ )
    {
        indices.Append( 0 );
        indices.Append( i + 2 );
        indices.Append( i + 1 );
    }
    indices.Append( 0 );
    indices.Append( 1 );
    indices.Append( numDivisions );
    // Bottom cap
    for( i = 3; i < numDivisions + 1; i++ )
    {
        indices.Append( i - 1 );
        indices.Append( i );
        indices.Append( 1 );
    }

    /// Create a drawable for it
    drawable = plDrawableGenerator::GenerateDrawable( points.GetCount(), points.AcquireArray(), normals.AcquireArray(),
                                                        nil, 0,
                                                        nil, true, multColor,
                                                        indices.GetCount(), indices.AcquireArray(),
                                                        material, localToWorld, blended, retIndex, toAddTo );

    return drawable;
}

//// GenerateAxesDrawable ////////////////////////////////////////////////////

plDrawableSpans     *plDrawableGenerator::GenerateAxesDrawable( hsGMaterial *material, 
                                                                const hsMatrix44 &localToWorld, hsBool blended,
                                                                const hsColorRGBA* multColor,
                                                                hsTArray<UInt32> *retIndex, plDrawableSpans *toAddTo )
{
    hsTArray<hsPoint3>      points;
    hsTArray<hsVector3>     normals;
    hsTArray<hsColorRGBA>   colors;
    hsTArray<UInt16>        indices;

    int                 i;
    float               size = 15;
    plDrawableSpans     *drawable;


    /// Generate points
    points.SetCount( 6 * 3 );
    normals.SetCount( 6 * 3 );
    colors.SetCount( 6 * 3 );

    points[ 0 ].Set( 0, 0, 0 );
    points[ 1 ].Set( size, -size * 0.1f, 0 );
    points[ 2 ].Set( size, -size * 0.3f, 0 );
    points[ 3 ].Set( size * 1.3f, 0, 0 );
    points[ 4 ].Set( size, size * 0.3f, 0 );
    points[ 5 ].Set( size, size * 0.1f, 0 );
    for( i = 0; i < 6; i++ )
    {
        points[ i + 6 ].fX = - points[ i ].fY;
        points[ i + 6 ].fY = points[ i ].fX;
        points[ i + 6 ].fZ = 0;

        points[ i + 12 ].fX = points[ i ].fY;
        points[ i + 12 ].fZ = points[ i ].fX;
        points[ i + 12 ].fY = 0;

        colors[ i ].Set( 1, 0, 0, 1 );
        colors[ i + 6 ].Set( 0, 1, 0, 1 );
        colors[ i + 12 ].Set( 0, 0, 1, 1 );

        if( multColor )
            colors[ i ] *= *multColor;
    }

    /// Generate indices
    indices.SetCount( 6 * 3 );
    for( i = 0; i < 18; i += 6 )
    {
        indices[ i ] = i + 0;
        indices[ i + 1 ] = i + 1;
        indices[ i + 2 ] = i + 5;
        indices[ i + 3 ] = i + 2;
        indices[ i + 4 ] = i + 3;
        indices[ i + 5 ] = i + 4;
    }

    /// Create a drawable for it
    drawable = plDrawableGenerator::GenerateDrawable( points.GetCount(), points.AcquireArray(), normals.AcquireArray(),
                                                        nil, 0,
                                                        nil, true, multColor,
                                                        indices.GetCount(), indices.AcquireArray(),
                                                        material, localToWorld, blended, retIndex, toAddTo );

    return drawable;
}

//// GeneratePlanarDrawable //////////////////////////////////////////////////
//  Version that takes a corner and two vectors, for x and y edges.

#define CALC_PNORMAL( nA, xVec, yVec ) { hsVector3 n = (xVec) % (yVec); n.Normalize(); nA.Append( n ); }

plDrawableSpans     *plDrawableGenerator::GeneratePlanarDrawable( const hsPoint3 &corner, const hsVector3 &xVec, const hsVector3 &yVec,
                                                                hsGMaterial *material, const hsMatrix44 &localToWorld, hsBool blended,
                                                                const hsColorRGBA* multColor,
                                                                hsTArray<UInt32> *retIndex, plDrawableSpans *toAddTo )
{
    hsTArray<hsPoint3>      points;
    hsTArray<hsVector3>     normals;
    hsTArray<UInt16>        indices;
    hsTArray<hsColorRGBA>   colors;
    hsTArray<hsPoint3>      uvws;
    hsPoint3                point;

    plDrawableSpans     *drawable;


    /// Generate points and normals
    points.Expand( 4 );
    normals.Expand( 4 );

    point = corner;                 points.Append( point );
    point += xVec;                  points.Append( point );
    point += yVec;                  points.Append( point );
    point = corner + yVec;          points.Append( point );

    CALC_PNORMAL( normals, xVec, yVec );
    CALC_PNORMAL( normals, xVec, yVec );
    CALC_PNORMAL( normals, xVec, yVec );
    CALC_PNORMAL( normals, xVec, yVec );

    uvws.Expand( 4 );
    uvws.Append( hsPoint3( 0.f, 1.f, 0.f ) );
    uvws.Append( hsPoint3( 1.f, 1.f, 0.f ) );
    uvws.Append( hsPoint3( 1.f, 0.f, 0.f ) );
    uvws.Append( hsPoint3( 0.f, 0.f, 0.f ) );

    /// Generate indices
    indices.Expand( 6 );
    indices.Append( 0 ); indices.Append( 1 ); indices.Append( 2 );
    indices.Append( 0 ); indices.Append( 2 ); indices.Append( 3 );

    /// Create a drawable for it
    drawable = plDrawableGenerator::GenerateDrawable( points.GetCount(), points.AcquireArray(), normals.AcquireArray(),
                                                        uvws.AcquireArray(), 1,
                                                        nil, true, multColor,
                                                        indices.GetCount(), indices.AcquireArray(),
                                                        material, localToWorld, blended, retIndex, toAddTo );

    return drawable;
}