pcsx2/plugins/GSnull/GifTransfer.h

/*  GSnull
 *  Copyright (C) 2002-2010  PCSX2 Dev Team
 *
 *  PCSX2 is free software: you can redistribute it and/or modify it under the terms
 *  of the GNU Lesser General Public License as published by the Free Software Found-
 *  ation, either version 3 of the License, or (at your option) any later version.
 *
 *  PCSX2 is distributed in the hope that it will be useful, 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 PCSX2.
 *  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef __GIF_TRANSFER_H__
#define __GIF_TRANSFER_H__

#include <assert.h>
#include <algorithm>
#include "Registers.h"

enum GIF_FLG {
    GIF_FLG_PACKED = 0,
    GIF_FLG_REGLIST = 1,
    GIF_FLG_IMAGE = 2,
    GIF_FLG_IMAGE2 = 3
};

//
// GIFTag
union GIFTag
{
    u64 ai64[2];
    u32 ai32[4];

    struct
    {
        u32 NLOOP : 15;
        u32 EOP : 1;
        u32 _PAD1 : 16;
        u32 _PAD2 : 14;
        u32 PRE : 1;
        u32 PRIM : 11;
        u32 FLG : 2; // enum GIF_FLG
        u32 NREG : 4;
        u64 REGS : 64;
    };

    void set(const u32 *data)
    {
        for (int i = 0; i <= 3; i++) {
            ai32[i] = data[i];
        }
    }

    GIFTag(u32 *data)
    {
        set(data);
    }

    GIFTag()
    {
        ai64[0] = 0;
        ai64[1] = 0;
    }
};

// EE part. Data transfer packet description

typedef struct
{
    u32 mode;
    int reg;
    u64 regs;
    u32 nloop;
    int eop;
    int nreg;
    u32 adonly;
    GIFTag tag;

    void setTag(const u32 *data)
    {
        tag.set(data);

        nloop = tag.NLOOP;
        eop = tag.EOP;
        mode = tag.FLG;
        //adonly = false;

        // Hmm....
        nreg = tag.NREG << 2;
        if (nreg == 0)
            nreg = 64;
        regs = tag.REGS;
        reg = 0;
        //if ((nreg == 4) && (regs == GIF_REG_A_D)) adonly = true;

        //      GSLog::Writeln"GIFtag: %8.8lx_%8.8lx_%8.8lx_%8.8lx: EOP=%d, NLOOP=%x, FLG=%x, NREG=%d, PRE=%d",
        //                      data[3], data[2], data[1], data[0],
        //                      path->eop, path->nloop, mode, path->nreg, tag.PRE);
    }

    u32 GetReg()
    {
        return (regs >> reg) & 0xf;
    }

    bool StepReg()
    {
        reg += 4;

        if (reg == nreg) {
            reg = 0;
            nloop--;

            if (nloop == 0)
                return false;
        }

        return true;
    }

} pathInfo;

extern void _GSgifPacket(pathInfo *path, const u32 *pMem);
extern void _GSgifRegList(pathInfo *path, const u32 *pMem);
template <int index>
extern void _GSgifTransfer(const u32 *pMem, u32 size);
extern GIFRegHandler GIFPackedRegHandlers[];
extern GIFRegHandler GIFRegHandlers[];
#endif // GIFTRANSFER_H_INCLUDED