// Copyright (C) 2003-2008 Dolphin Project.
// 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
// the Free Software Foundation, version 2.0.
// This program 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 2.0 for more details.
// A copy of the GPL 2.0 should have been included with the program.
// If not, see http://www.gnu.org/licenses/
// Official SVN repository and contact information can be found at
// http://code.google.com/p/dolphin-emu/
//DL facts:
// Ikaruga uses NO display lists!
// Zelda WW uses TONS of display lists
// Zelda TP uses almost 100% display lists except menus (we like this!)
// Note that it IS NOT POSSIBLE to precompile display lists! You can compile them as they are
// and hope that the vertex format doesn't change, though, if you do it just when they are
// called. The reason is that the vertex format affects the sizes of the vertices.
#include "Globals.h"
#include "OpcodeDecoding.h"
#include "VertexLoader.h"
#include "VertexShaderManager.h"
#include "TextureMngr.h"
#include "BPStructs.h"
#include "DataReader.h"
#define CMDBUFFER_SIZE 1024*1024
void Decode();
extern u8 FAKE_PeekFifo8(u32 _uOffset);
extern u16 FAKE_PeekFifo16(u32 _uOffset);
extern u32 FAKE_PeekFifo32(u32 _uOffset);
extern int FAKE_GetFifoSize();
CDataReader_Fifo g_fifoReader;
void ExecuteDisplayList(u32 address, u32 size)
{
IDataReader* pOldReader = g_pDataReader;
//address &= 0x01FFFFFF; // phys address
CDataReader_Memory memoryReader(address);
g_pDataReader = &memoryReader;
while((memoryReader.GetReadAddress() - address) < size)
{
Decode();
}
INCSTAT(stats.numDListsAlive);
// reset to the old reader
g_pDataReader = pOldReader;
}
inline u8 PeekFifo8(u32 _uOffset)
{
return FAKE_PeekFifo8(_uOffset);
}
inline u16 PeekFifo16(u32 _uOffset)
{
return FAKE_PeekFifo16(_uOffset);
}
inline u32 PeekFifo32(u32 _uOffset)
{
return FAKE_PeekFifo32(_uOffset);
}
bool FifoCommandRunnable(void)
{
u32 iBufferSize = FAKE_GetFifoSize();
if (iBufferSize == 0)
return false;
u8 Cmd = PeekFifo8(0);
u32 iCommandSize = 0;
switch(Cmd)
{
case GX_NOP:
// Hm, this means that we scan over nop streams pretty slowly...
iCommandSize = 1;
break;
case GX_LOAD_CP_REG:
iCommandSize = 6;
break;
case GX_LOAD_INDX_A:
case GX_LOAD_INDX_B:
case GX_LOAD_INDX_C:
case GX_LOAD_INDX_D:
iCommandSize = 5;
break;
case GX_CMD_CALL_DL:
iCommandSize = 9;
break;
case 0x44:
iCommandSize = 1;
// zelda 4 swords calls it and checks the metrics registers after that
break;
case GX_CMD_INVL_VC: // invalid vertex cache - no parameter?
iCommandSize = 1;
break;
case GX_LOAD_BP_REG:
iCommandSize = 5;
break;
case GX_LOAD_XF_REG:
{
// check if we can read the header
if (iBufferSize >= 5) {
iCommandSize = 1 + 4;
u32 Cmd2 = PeekFifo32(1);
int dwTransferSize = ((Cmd2>>16)&15) + 1;
iCommandSize += dwTransferSize * 4;
}
else {
return false;
}
}
break;
default:
if (Cmd&0x80)
{
// check if we can read the header
if (iBufferSize >= 3) {
iCommandSize = 1 + 2;
u16 numVertices = PeekFifo16(1);
VertexLoader& vtxLoader = g_VertexLoaders[Cmd & GX_VAT_MASK];
iCommandSize += numVertices * vtxLoader.ComputeVertexSize();
}
else {
return false;
}
}
else {
char szTemp[1024];
sprintf(szTemp, "GFX: Unknown Opcode (0x%x).\n"
"This means one of the following:\n"
"* The emulated GPU got desynced, disabling dual core can help\n"
"* Command stream corrupted by some spurious memory bug\n"
"* This really is an unknown opcode (unlikely)\n\n"
"* Some other sort of bug\n\n"
"Dolphin will now likely crash or hang. Enjoy.", Cmd);
SysMessage(szTemp);
g_VideoInitialize.pLog(szTemp, TRUE);
}
break;
}
if (iCommandSize > iBufferSize)
return false;
INFO_LOG("OP detected: Cmd 0x%x size %i buffer %i",Cmd, iCommandSize, iBufferSize);
return true;
}
void Decode(void)
{
int Cmd = g_pDataReader->Read8();
switch(Cmd)
{
case GX_NOP:
break;
case GX_LOAD_CP_REG: //0x08
{
u32 SubCmd = g_pDataReader->Read8();
u32 Value = g_pDataReader->Read32();
VertexManager::LoadCPReg(SubCmd,Value);
}
break;
case GX_LOAD_XF_REG:
{
u32 Cmd2 = g_pDataReader->Read32();
int dwTransferSize = ((Cmd2>>16)&15) + 1;
DWORD dwAddress = Cmd2 & 0xFFFF;
static u32 pData[16];
for (int i=0; i<dwTransferSize; i++)
pData[i] = g_pDataReader->Read32();
VertexShaderMngr::LoadXFReg(dwTransferSize,dwAddress,pData);
}
break;
case GX_LOAD_INDX_A: //used for position matrices
VertexShaderMngr::LoadIndexedXF(g_pDataReader->Read32(),0xC);
break;
case GX_LOAD_INDX_B: //used for normal matrices
VertexShaderMngr::LoadIndexedXF(g_pDataReader->Read32(),0xD);
break;
case GX_LOAD_INDX_C: //used for postmatrices
VertexShaderMngr::LoadIndexedXF(g_pDataReader->Read32(),0xE);
break;
case GX_LOAD_INDX_D: //used for lights
VertexShaderMngr::LoadIndexedXF(g_pDataReader->Read32(),0xF);
break;
case GX_CMD_CALL_DL:
{
u32 dwAddr = g_pDataReader->Read32();
u32 dwCount = g_pDataReader->Read32();
ExecuteDisplayList(dwAddr, dwCount);
}
break;
case 0x44:
// zelda 4 swords calls it and checks the metrics registers after that
break;
case GX_CMD_INVL_VC:// Invalidate (vertex cache?)
DebugLog("Invalidate (vertex cache?)");
break;
case GX_LOAD_BP_REG: //0x61
{
u32 cmd = g_pDataReader->Read32();
LoadBPReg(cmd);
}
break;
// draw primitives
default:
if (Cmd&0x80)
{
// load vertices
u16 numVertices = g_pDataReader->Read16();
if( numVertices > 0 ) {
g_VertexLoaders[Cmd & GX_VAT_MASK].RunVertices((Cmd & GX_PRIMITIVE_MASK) >> GX_PRIMITIVE_SHIFT, numVertices);
}
}
else
{
// char szTmp[256];
//sprintf(szTmp, "Illegal command %02x (at %08x)",Cmd,g_pDataReader->GetPtr());
//g_VideoInitialize.pLog(szTmp);
//MessageBox(0,szTmp,"GFX ERROR",0);
// _assert_msg_(0,szTmp,"");
break;
}
break;
}
}
void OpcodeDecoder_Init()
{
g_pDataReader = &g_fifoReader;
}
void OpcodeDecoder_Shutdown()
{
}
void OpcodeDecoder_Run()
{
// just a small check
if (g_pDataReader != &g_fifoReader) {
SysMessage("very strange");
}
DVSTARTPROFILE();
while (FifoCommandRunnable())
{
Decode();
}
}