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

/*==LICENSE==*

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

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*==LICENSE==*/

#ifndef plSpanInstance_inc
#define plSpanInstance_inc

#include "hsGeometry3.h"
#include "hsMatrix44.h"

// plClusterGroup
//      array of templates
//      array of materials (indexed by templates)
//      array of clusters
//      array of LOD blend 
//      array of vis sets

// plCluster
//      array of span instances that are combinable
//      LOD blend start and end index
//      vis set index
//      Combinable means:
//          same material
//          same format
//          same LOD blend
//          same vis set
//          same lights
//          same encoding?

// plSpanInstance
//      template idx
//      3x4 transform
//      encoding flags 
//          (what components does it include, delPos? color?)
//          (what's the encoding? 32bit RGBA? 16Bit/Chan? 10Bit/Chan? 8Bit/Chan?)
//          (need an encoding per channel)

// plSpanTemplate
//      numVerts
//      Format (assume pos & norm?)
//          kUVWMask
//          kColMask
//          kWeightMask
//      fPos
//      fNorm
//      fCol
//      fUVWs
//      fWeights


class plSpanEncoding
{
public:
    enum
    {
        kPosNone            = 0x0,
        kPos888             = 0x1,
        kPos161616          = 0x2,
        kPos101010          = 0x4,
        kPos008             = 0x8,
        kPosMask            = kPos888 | kPos161616 | kPos101010 | kPos008,

        kColNone            = 0x0,
        kColA8              = 0x10,
        kColI8              = 0x20,
        kColAI88            = 0x40,
        kColRGB888          = 0x80,
        kColARGB8888        = 0x100,
        kColMask            = kColNone
                                | kColA8
                                | kColI8
                                | kColAI88
                                | kColRGB888
                                | kColARGB8888,
    };

    uint32_t          fCode;
    float        fPosScale;

    plSpanEncoding() : fCode(kPosNone|kColNone), fPosScale(0) {}
    plSpanEncoding(uint32_t c, float s) : fCode(c), fPosScale(s) {}

    uint32_t      Code() const { return fCode; }
    float    Scale() const { return fPosScale; }

    void Read(hsStream* s);
    void Write(hsStream* s) const;
};

class plSpanInstance
{
protected:
    uint8_t*          fPosDelta;
    uint8_t*          fCol;

    float        fL2W[3][4];

    friend class plSpanInstanceIter;
public:
    plSpanInstance();
    ~plSpanInstance();

    void Read(hsStream* s, const plSpanEncoding& encoding, uint32_t numVerts);
    void Write(hsStream* s, const plSpanEncoding& encoding, uint32_t numVerts) const;

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

    void Alloc(const plSpanEncoding& encoding, uint32_t numVerts);
    void DeAlloc();

    hsMatrix44 LocalToWorld() const;
    hsMatrix44 WorldToLocal() const;

    void SetLocalToWorld(const hsMatrix44& l2w);

    bool HasPosDelta() const { return fPosDelta != nil; }
    bool HasColor() const { return fCol != nil; }

    static uint16_t PosStrideFromEncoding(const plSpanEncoding& encoding)
    {
        switch(encoding.fCode & plSpanEncoding::kPosMask)
        {
        case plSpanEncoding::kPos888:
            return 3;
        case plSpanEncoding::kPos161616:
            return 6;
        case plSpanEncoding::kPos101010:
            return 4;
        case plSpanEncoding::kPos008:
            return 1;
        }
        return 0;
    }
    static uint16_t ColStrideFromEncoding(const plSpanEncoding& encoding)
    {
        switch(encoding.fCode & plSpanEncoding::kColMask)
        {
        case plSpanEncoding::kColNone:
            return 0;
        case plSpanEncoding::kColA8:
            return 1;
        case plSpanEncoding::kColI8:
            return 1;
        case plSpanEncoding::kColAI88:
            return 2;
        case plSpanEncoding::kColRGB888:
            return 3;
        case plSpanEncoding::kColARGB8888:
            return 4;
        }
        return 0;
    }
};

class plSpanInstanceIter
{
protected:
    plSpanInstance*     fInst;
    plSpanEncoding      fEncoding;
    uint32_t              fNumVerts;
    int32_t               fNumVertsLeft;
    uint16_t              fPosStride;
    uint16_t              fColStride;

    union {
        int8_t*       fPos888;
        int16_t*      fPos161616;
        uint32_t*     fPos101010;
    };
    union {
        uint8_t*      fA8;
        uint8_t*      fI8;
        uint16_t*     fAI88;
        uint8_t*      fRGB888;
        uint32_t*     fARGB8888;
    };

public:
    plSpanInstanceIter();
    plSpanInstanceIter(plSpanInstance* inst, const plSpanEncoding& encoding, uint32_t numVerts) { Init(inst, encoding, numVerts); }

    void Init(plSpanInstance* inst, const plSpanEncoding& encoding, uint32_t numVerts)
    {
        fInst = inst;
        fEncoding = encoding;
        fNumVerts = numVerts;
        fPosStride = inst->PosStrideFromEncoding(fEncoding);
        fColStride = inst->ColStrideFromEncoding(fEncoding);
        fNumVertsLeft = 0;
    }

    void        Begin()
    {
        fPos888 = (int8_t*)fInst->fPosDelta;
        fA8 = fInst->fCol;

        fNumVertsLeft = fNumVerts;
    }
    void        Advance()
    {
        fPos888 += fPosStride;
        fA8 += fColStride;

        fNumVertsLeft--;
    }
    bool        More() const { return fNumVertsLeft > 0; }

    hsVector3   DelPos() const
    {
        switch(fEncoding.fCode & plSpanEncoding::kPosMask)
        {
        case plSpanEncoding::kPos888:
            return hsVector3(fPos888[0] * fEncoding.fPosScale, 
                                fPos888[1] * fEncoding.fPosScale, 
                                fPos888[2] * fEncoding.fPosScale);
        case plSpanEncoding::kPos161616:
            return hsVector3(fPos161616[0] * fEncoding.fPosScale, 
                                fPos161616[1] * fEncoding.fPosScale, 
                                fPos161616[2] * fEncoding.fPosScale);
        case plSpanEncoding::kPos101010:
            return hsVector3(int(*fPos101010 & 0x3f) * fEncoding.fPosScale,
                int((*fPos101010 >> 10) & 0x3f) * fEncoding.fPosScale,
                int((*fPos101010 >> 20) & 0x3f) * fEncoding.fPosScale);
        case plSpanEncoding::kPos008:
            return hsVector3(0,0, *fPos888 * fEncoding.fPosScale);
        }
        return hsVector3(0,0,0);
    };
    hsPoint3 Position(const hsPoint3& p) const
    {
        hsPoint3 pos(p);
        pos += DelPos();
        return pos;
    };
    uint32_t      Color(uint32_t c) const 
    { 
        switch(fEncoding.fCode & plSpanEncoding::kColMask)
        {
        case plSpanEncoding::kColA8:
            return (c & 0x00ffffff) | *fA8;
        case plSpanEncoding::kColI8:
            return (c & 0xff000000) 
                | (*fI8 << 16)
                | (*fI8 << 8)
                | (*fI8 << 0);
        case plSpanEncoding::kColAI88:
            {
                const uint32_t col = *fAI88 & 0xff;
                return ((*fAI88 & 0xff00) << 24)
                    | (col << 16)
                    | (col << 8)
                    | (col << 0);
            }
        case plSpanEncoding::kColRGB888:
            return (c & 0xff000000)
                | (fRGB888[0] << 16)
                | (fRGB888[1] << 8)
                | (fRGB888[2] << 0);
        case plSpanEncoding::kColARGB8888:
            return *fARGB8888;
        }
        return c; 
    };
};

#endif // plSpanInstance_inc