/*==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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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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*==LICENSE==*/
#ifndef hsGMatState_inc
#define hsGMatState_inc

#include "hsColorRGBA.h"

class hsStream;

class hsGMatState {
public:
enum hsGMatBlendFlags {
    kBlendTest  = 0x1,                          // dev
    // Rest of blends are mutually exclusive
    kBlendAlpha                     = 0x2,      // dev
    kBlendMult                      = 0x4,      // dev
    kBlendAdd                       = 0x8,      // dev
    kBlendAddColorTimesAlpha        = 0x10,     // dev
    kBlendAntiAlias                 = 0x20,
    kBlendDetail                    = 0x40,
    kBlendNoColor                   = 0x80,     // dev
    kBlendMADD                      = 0x100,
    kBlendDot3                      = 0x200,
    kBlendAddSigned                 = 0x400,
    kBlendAddSigned2X               = 0x800,
    kBlendMask                      = kBlendAlpha
                                    | kBlendMult
                                    | kBlendAdd
                                    | kBlendAddColorTimesAlpha
                                    | kBlendDetail
                                    | kBlendMADD
                                    | kBlendDot3
                                    | kBlendAddSigned
                                    | kBlendAddSigned2X,
    kBlendInvertAlpha               = 0x1000,   // dev
    kBlendInvertColor               = 0x2000,   // dev
    kBlendAlphaMult                 = 0x4000,
    kBlendAlphaAdd                  = 0x8000,
    kBlendNoVtxAlpha                = 0x10000,
    kBlendNoTexColor                = 0x20000,
    kBlendNoTexAlpha                = 0x40000,
    kBlendInvertVtxAlpha            = 0x80000,  // Invert ONLY the vertex alpha source
    kBlendAlphaAlways               = 0x100000, // Alpha test always passes (even for alpha=0).
    kBlendInvertFinalColor          = 0x200000,
    kBlendInvertFinalAlpha          = 0x400000,
    kBlendEnvBumpNext               = 0x800000,
    kBlendSubtract                  = 0x1000000,
    kBlendRevSubtract               = 0x2000000,
    kBlendAlphaTestHigh             = 0x4000000
};
enum hsGMatClampFlags {

    kClampTextureU  = 0x1,          // dev
    kClampTextureV  = 0x2,          // dev
    kClampTexture   = 0x3               // dev
};

enum hsGMatShadeFlags {

    kShadeSoftShadow        = 0x1,          // view, dev
    kShadeNoProjectors      = 0x2,          // projector
    kShadeEnvironMap        = 0x4,          // dev, load
    kShadeVertexShade       = 0x20,         // dev
    kShadeNoShade           = 0x40,         // view,dev
    kShadeBlack             = kShadeNoShade,
    kShadeSpecular          = 0x80,         // view, dev
    //kShadeNoFog               = 0x100,        // dev
    kShadeWhite             = 0x200,
    kShadeSpecularAlpha     = 0x400,
    kShadeSpecularColor     = 0x800,
    kShadeSpecularHighlight = 0x1000,
    kShadeVertColShade      = 0x2000,
    kShadeInherit           = 0x4000,
    kShadeIgnoreVtxIllum    = 0x8000,
    kShadeEmissive          = 0x10000,      // Moved here 8.27 mcn. Only really sane to use with kMiscEndPassHere
    kShadeReallyNoFog       = 0x20000
};

enum hsGMatZFlags {
    kZIncLayer          = 0x1, // dev
    kZClearZ            = 0x4, // dev
    kZNoZRead           = 0x8, // dev
    kZNoZWrite          = 0x10,
    kZMask              = kZNoZWrite | kZClearZ | kZNoZRead,
    kZLODBias           = 0x20
};

enum hsGMatMiscFlags {
    kMiscWireFrame          = 0x1,          // dev (running out of bits)
    kMiscDrawMeshOutlines   = 0x2,          // dev, currently unimplemented
    kMiscTwoSided           = 0x4,          // view,dev
    kMiscDrawAsSplats       = 0x8,          // dev? bwt
    kMiscAdjustPlane        = 0x10,
    kMiscAdjustCylinder     = 0x20,
    kMiscAdjustSphere       = 0x40,
    kMiscAdjust             = kMiscAdjustPlane | kMiscAdjustCylinder| kMiscAdjustSphere,
    kMiscTroubledLoner      = 0x80,
    kMiscBindSkip           = 0x100,
    kMiscBindMask           = 0x200,
    kMiscBindNext           = 0x400,
    kMiscLightMap           = 0x800,
    kMiscUseReflectionXform = 0x1000,       // Use the calculated reflection environment 
                                            // texture transform instead of layer->GetTransform()
    kMiscPerspProjection    = 0x2000,
    kMiscOrthoProjection    = 0x4000,
    kMiscProjection         = kMiscPerspProjection | kMiscOrthoProjection,

    kMiscRestartPassHere    = 0x8000,       // Tells pipeline to start a new pass beginning with this layer
                                            // Kinda like troubledLoner, but only cuts off lower layers, not 
                                            // higher ones (kMiscBindNext sometimes does this by implication)

    kMiscBumpLayer          = 0x10000,
    kMiscBumpDu             = 0x20000,
    kMiscBumpDv             = 0x40000,
    kMiscBumpDw             = 0x80000,
    kMiscBumpChans          = kMiscBumpDu | kMiscBumpDv | kMiscBumpDw,

    kMiscNoShadowAlpha      = 0x100000,
    kMiscUseRefractionXform = 0x200000, // Use a refraction-like hack.
    kMiscCam2Screen         = 0x400000, // Expects tex coords to be XYZ in camera space. Does a cam to screen (not NDC) projection
                                        // and swaps Z with W, so that the texture projection can produce projected 2D screen coordinates.

    kAllMiscFlags           = 0xffffffff
};
enum StateIdx {
    kBlend,
    kClamp,
    kShade,
    kZ,
    kMisc 
};
    uint32_t          fBlendFlags;
    uint32_t          fClampFlags;
    uint32_t          fShadeFlags;
    uint32_t          fZFlags;
    uint32_t          fMiscFlags;

    static hsBool Differs(uint32_t mine, uint32_t hers, uint32_t mask)
    {
        return (mine & mask) ^ (hers & mask);
    }

    static hsBool Differs(uint32_t mine, uint32_t hers)
    {
        return mine ^ hers;
    }

    hsBool operator!=(const hsGMatState& other)
    {
        return ((fBlendFlags ^ other.fBlendFlags)
            | (fClampFlags ^ other.fClampFlags)
            | (fShadeFlags ^ other.fShadeFlags)
            | (fZFlags ^ other.fZFlags)
            | (fMiscFlags ^ other.fMiscFlags));
    }
    uint32_t Value(int i) const
    {
        switch(i)
        {
        case kBlend:
            return fBlendFlags;
        case kClamp:
            return fClampFlags;
        case kShade:
            return fShadeFlags;
        case kZ:
            return fZFlags;
        case kMisc:
            return fMiscFlags;
        }
        hsAssert(false, "Bad param");
        return fBlendFlags;
    }
    uint32_t& operator[](const int i)
    {
        switch(i)
        {
        case kBlend:
            return fBlendFlags;
        case kClamp:
            return fClampFlags;
        case kShade:
            return fShadeFlags;
        case kZ:
            return fZFlags;
        case kMisc:
            return fMiscFlags;
        }
        hsAssert(false, "Bad param");
        return fBlendFlags;
    }
    hsGMatState& operator|=(const hsGMatState& other)
    {
        fBlendFlags |= other.fBlendFlags;
        fClampFlags |= other.fClampFlags;
        fShadeFlags |= other.fShadeFlags;
        fZFlags |= other.fZFlags;
        fMiscFlags |= other.fMiscFlags;
        return *this;
    }
    hsGMatState& operator+=(const hsGMatState& other)
    {
        return operator|=(other);
    }
    hsGMatState& operator-=(const hsGMatState& other)
    {
        fBlendFlags &= ~other.fBlendFlags;
        fClampFlags &= ~other.fClampFlags;
        fShadeFlags &= ~other.fShadeFlags;
        fZFlags &= ~other.fZFlags;
        fMiscFlags &= ~other.fMiscFlags;
        return *this;
    }

    inline void Read(hsStream* s);
    inline void Write(hsStream* s);

    hsGMatState(uint32_t blend=0, uint32_t clamp=0, uint32_t shade=0, uint32_t z=0, uint32_t misc=0) 
        :   fBlendFlags(blend), 
            fClampFlags(clamp),
            fShadeFlags(shade),
            fZFlags(z),
            fMiscFlags(misc) {}
    void Reset() { fBlendFlags = fClampFlags = fShadeFlags = fZFlags = fMiscFlags = 0; }
    inline void Clear(const hsGMatState& state);
    inline void Composite(const hsGMatState& want, const hsGMatState& on, const hsGMatState& off);
};


#endif // hsGMatState_inc
