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// Copyright (C) 2003-2009 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/
#include "Common.h"
#include "../../../Core/VideoCommon/Src/DataReader.h"
#include "main.h"
#include "OpcodeDecoder.h"
#include "BPMemLoader.h"
#include "CPMemLoader.h"
#include "XFMemLoader.h"
#include "VertexLoader.h"
#include "Statistics.h"
#include "DebugUtil.h"
#include "CommandProcessor.h"
typedef void (*DecodingFunction)(u32);
DecodingFunction currentFunction = NULL;
u32 minCommandSize;
u16 streamSize;
u16 streamAddress;
bool readOpcode;
VertexLoader vertexLoader;
bool inObjectStream;
u8 lastPrimCmd;
namespace OpcodeDecoder
{
void DecodePrimitiveStream(u32 iBufferSize)
{
u32 vertexSize = vertexLoader.GetVertexSize();
if(g_bSkipCurrentFrame)
{
while (streamSize > 0 && iBufferSize >= vertexSize)
{
g_pVideoData += vertexSize;
iBufferSize -= vertexSize;
streamSize--;
}
}
else
{
while (streamSize > 0 && iBufferSize >= vertexSize)
{
vertexLoader.LoadVertex();
iBufferSize -= vertexSize;
streamSize--;
}
}
if (streamSize == 0)
{
// return to normal command processing
ResetDecoding();
}
}
void ReadXFData(u32 iBufferSize)
{
_assert_msg_(VIDEO, iBufferSize >= (u32)(streamSize * 4), "Underflow during standard opcode decoding");
u32 pData[16];
for (int i = 0; i < streamSize; i++)
pData[i] = DataReadU32();
LoadXFReg(streamSize, streamAddress, pData);
// return to normal command processing
ResetDecoding();
}
void ExecuteDisplayList(u32 addr, u32 count)
{
u8 *videoDataSave = g_pVideoData;
u8 *dlStart = g_VideoInitialize.pGetMemoryPointer(addr);
g_pVideoData = dlStart;
while (OpcodeDecoder::CommandRunnable(count))
{
OpcodeDecoder::Run(count);
// if data was read by the opcode decoder then the video data pointer changed
u32 readCount = g_pVideoData - dlStart;
dlStart = g_pVideoData;
_assert_msg_(VIDEO, count >= readCount, "Display list underrun");
count -= readCount;
}
g_pVideoData = videoDataSave;
}
void DecodeStandard(u32 bufferSize)
{
_assert_msg_(VIDEO, CommandRunnable(bufferSize), "Underflow during standard opcode decoding");
int Cmd = DataReadU8();
if (Cmd == GX_NOP)
return;
// check if switching in or out of an object
// only used for debuggging
if (inObjectStream && (Cmd & 0x87) != lastPrimCmd)
{
inObjectStream = false;
DebugUtil::OnObjectEnd();
}
if (Cmd & 0x80 && !inObjectStream)
{
inObjectStream = true;
lastPrimCmd = Cmd & 0x87;
DebugUtil::OnObjectBegin();
}
switch(Cmd)
{
case GX_NOP:
break;
case GX_LOAD_CP_REG: //0x08
{
u32 SubCmd = DataReadU8();
u32 Value = DataReadU32();
LoadCPReg(SubCmd, Value);
}
break;
case GX_LOAD_XF_REG:
{
u32 Cmd2 = DataReadU32();
streamSize = ((Cmd2 >> 16) & 15) + 1;
streamAddress = Cmd2 & 0xFFFF;
currentFunction = ReadXFData;
minCommandSize = streamSize * 4;
readOpcode = false;
}
break;
case GX_LOAD_INDX_A: //used for position matrices
LoadIndexedXF(DataReadU32(), 0xC);
break;
case GX_LOAD_INDX_B: //used for normal matrices
LoadIndexedXF(DataReadU32(), 0xD);
break;
case GX_LOAD_INDX_C: //used for postmatrices
LoadIndexedXF(DataReadU32(), 0xE);
break;
case GX_LOAD_INDX_D: //used for lights
LoadIndexedXF(DataReadU32(), 0xF);
break;
case GX_CMD_CALL_DL:
{
u32 dwAddr = DataReadU32();
u32 dwCount = DataReadU32();
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?)
DEBUG_LOG(VIDEO, "Invalidate (vertex cache?)");
break;
case GX_LOAD_BP_REG: //0x61
{
u32 cmd = DataReadU32();
LoadBPReg(cmd);
}
break;
// draw primitives
default:
if (Cmd & 0x80)
{
u8 vatIndex = Cmd & GX_VAT_MASK;
u8 primitiveType = (Cmd & GX_PRIMITIVE_MASK) >> GX_PRIMITIVE_SHIFT;
vertexLoader.SetFormat(vatIndex, primitiveType);
// switch to primitive processing
streamSize = DataReadU16();
currentFunction = DecodePrimitiveStream;
minCommandSize = vertexLoader.GetVertexSize();
readOpcode = false;
INCSTAT(stats.thisFrame.numPrimatives);
DEBUG_LOG(VIDEO, "Draw begin");
}
else
{
PanicAlert("GFX: Unknown Opcode (0x%x).\n", Cmd);
break;
}
break;
}
}
void Init()
{
inObjectStream = false;
lastPrimCmd = 0;
ResetDecoding();
}
void ResetDecoding()
{
currentFunction = DecodeStandard;
minCommandSize = 1;
readOpcode = true;
}
bool CommandRunnable(u32 iBufferSize)
{
if (iBufferSize < minCommandSize)
return false;
if (readOpcode)
{
u8 Cmd = DataPeek8(0);
u32 minSize = 1;
switch(Cmd)
{
case GX_LOAD_CP_REG: //0x08
minSize = 6;
break;
case GX_LOAD_XF_REG:
minSize = 5;
break;
case GX_LOAD_INDX_A: //used for position matrices
minSize = 5;
break;
case GX_LOAD_INDX_B: //used for normal matrices
minSize = 5;
break;
case GX_LOAD_INDX_C: //used for postmatrices
minSize = 5;
break;
case GX_LOAD_INDX_D: //used for lights
minSize = 5;
break;
case GX_CMD_CALL_DL:
minSize = 9;
break;
case GX_LOAD_BP_REG: //0x61
minSize = 5;
break;
// draw primitives
default:
if (Cmd & 0x80)
minSize = 3;
break;
}
return (iBufferSize >= minSize);
}
return true;
}
void Run(u32 iBufferSize)
{
currentFunction(iBufferSize);
}
}
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