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/* 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/>.
*/
// Processes a GIFtag & packet, and throws out some gsIRQs as needed.
// Used to keep interrupts in sync with the EE, while the GS itself
// runs potentially several frames behind.
// size - size of the packet in simd128's
#include "GS.h"
#include "GifTransfer.h"
using namespace std;
extern GSVars gs;
PCSX2_ALIGNED16(u8 g_RealGSMem[0x2000]);
template <int index>
void _GSgifTransfer(const u32 *pMem, u32 size)
{
// FUNCLOG
pathInfo *path = &gs.path[index];
while (size > 0) {
//GSLog::Writeln(_T("Transfer(%08x, %d) START\n"), pMem, size);
if (path->nloop == 0) {
path->setTag(pMem);
pMem += 4;
size--;
// eeuser 7.2.2. GIFtag: "... when NLOOP is 0, the GIF does not output anything, and
// values other than the EOP field are disregarded."
if (path->nloop > 0) {
gs.q = 1.0f;
if (path->tag.PRE && (path->tag.FLG == GIF_FLG_PACKED)) {
u32 tagprim = path->tag.PRIM;
GIFRegHandlerPRIM((u32 *)&tagprim);
}
}
} else {
switch (path->mode) {
case GIF_FLG_PACKED: {
// first try a shortcut for a very common case
if (path->adonly && size >= path->nloop) {
size -= path->nloop;
do {
GIFPackedRegHandlerA_D(pMem);
pMem += 4; //sizeof(GIFPackedReg)/4;
} while (--path->nloop > 0);
break;
}
do {
u32 reg = path->GetReg();
GIFPackedRegHandlers[reg](pMem);
pMem += 4; //sizeof(GIFPackedReg)/4;
size--;
} while (path->StepReg() && (size > 0));
break;
}
case GIF_FLG_REGLIST: {
//GSLog::Writeln("%8.8x%8.8x %d L", ((u32*)&gs.regs)[1], *(u32*)&gs.regs, path->tag.nreg/4);
size *= 2;
do {
GIFRegHandlers[path->GetReg()](pMem);
pMem += 2;
size--;
} while (path->StepReg() && (size > 0));
if (size & 1)
pMem += 2;
size /= 2;
break;
}
case GIF_FLG_IMAGE: // FROM_VFRAM
case GIF_FLG_IMAGE2: // Used in the DirectX version, so we'll use it here too.
{
int len = min(size, path->nloop);
//GSLog::Writeln("GIF_FLG_IMAGE(%d)=%d", gs.imageTransfer, len);
switch (gs.imageTransfer) {
case 0:
//TransferHostLocal(pMem, len * 4);
break;
case 1:
// This can't happen; downloads can not be started or performed as part of
// a GIFtag operation. They're an entirely separate process that can only be
// done through the ReverseFIFO transfer (aka ReadFIFO). --air
assert(0);
break;
case 2:
// //TransferLocalLocal();
break;
case 3:
//assert(0);
break;
default:
//assert(0);
break;
}
pMem += len * 4;
path->nloop -= len;
size -= len;
break;
}
default: // GIF_IMAGE
GSLog::WriteLn("*** WARNING **** Unexpected GIFTag flag.");
assert(0);
path->nloop = 0;
break;
}
}
}
}
#define DO_GIF_TRANSFERS
// Obsolete. Included because it's still in GSdef.
EXPORT_C_(void)
GSgifTransfer1(u32 *pMem, u32 addr)
{
#ifdef DO_GIF_TRANSFERS
_GSgifTransfer<0>((u32 *)((u8 *)pMem + addr), (0x4000 - addr) / 16);
#endif
}
EXPORT_C_(void)
GSgifTransfer(const u32 *pMem, u32 size)
{
#ifdef DO_GIF_TRANSFERS
_GSgifTransfer<3>(const_cast<u32 *>(pMem), size);
#endif
}
EXPORT_C_(void)
GSgifTransfer2(u32 *pMem, u32 size)
{
#ifdef DO_GIF_TRANSFERS
_GSgifTransfer<1>(const_cast<u32 *>(pMem), size);
#endif
}
EXPORT_C_(void)
GSgifTransfer3(u32 *pMem, u32 size)
{
#ifdef DO_GIF_TRANSFERS
_GSgifTransfer<2>(const_cast<u32 *>(pMem), size);
#endif
}
void InitPath()
{
gs.path[0].mode = gs.path[1].mode = gs.path[2].mode = gs.path[3].mode = 0;
}
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