diff options
Diffstat (limited to 'Source/Core/VideoBackends/Software/OpcodeDecoder.cpp')
| -rw-r--r-- | Source/Core/VideoBackends/Software/OpcodeDecoder.cpp | 305 |
1 files changed, 305 insertions, 0 deletions
diff --git a/Source/Core/VideoBackends/Software/OpcodeDecoder.cpp b/Source/Core/VideoBackends/Software/OpcodeDecoder.cpp new file mode 100644 index 0000000000..21f0a97abd --- /dev/null +++ b/Source/Core/VideoBackends/Software/OpcodeDecoder.cpp @@ -0,0 +1,305 @@ +// Copyright 2013 Dolphin Emulator Project +// Licensed under GPLv2 +// Refer to the license.txt file included. + +#include "Common.h" + +#include "DataReader.h" + +#include "OpcodeDecoder.h" +#include "BPMemLoader.h" +#include "CPMemLoader.h" +#include "XFMemLoader.h" +#include "SWVertexLoader.h" +#include "SWStatistics.h" +#include "DebugUtil.h" +#include "SWCommandProcessor.h" +#include "CPMemLoader.h" +#include "SWVideoConfig.h" +#include "HW/Memmap.h" + +typedef void (*DecodingFunction)(u32); + +namespace OpcodeDecoder +{ +static DecodingFunction currentFunction = NULL; +static u32 minCommandSize; +static u16 streamSize; +static u16 streamAddress; +static bool readOpcode; +static SWVertexLoader vertexLoader; +static bool inObjectStream; +static u8 lastPrimCmd; + + +void DoState(PointerWrap &p) +{ + p.Do(minCommandSize); + // Not sure what is wrong with this. Something(s) in here is causing dolphin to crash/hang when loading states saved from another run of dolphin. Doesn't seem too important anyway... + //vertexLoader.DoState(p); + p.Do(readOpcode); + p.Do(inObjectStream); + p.Do(lastPrimCmd); + p.Do(streamSize); + p.Do(streamAddress); + if (p.GetMode() == PointerWrap::MODE_READ) + ResetDecoding(); +} + +void DecodePrimitiveStream(u32 iBufferSize) +{ + u32 vertexSize = vertexLoader.GetVertexSize(); + + bool skipPrimitives = g_bSkipCurrentFrame || + swstats.thisFrame.numDrawnObjects < g_SWVideoConfig.drawStart || + swstats.thisFrame.numDrawnObjects >= g_SWVideoConfig.drawEnd; + + if (skipPrimitives) + { + 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(); + SWLoadXFReg(streamSize, streamAddress, pData); + + // return to normal command processing + ResetDecoding(); +} + +void ExecuteDisplayList(u32 addr, u32 count) +{ + u8 *videoDataSave = g_pVideoData; + + u8 *dlStart = Memory::GetPointer(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 = (u32)(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; + // Causes a SIGBUS error on Android + // XXX: Investigate +#ifndef ANDROID + // check if switching in or out of an object + // only used for debugging + if (inObjectStream && (Cmd & 0x87) != lastPrimCmd) + { + inObjectStream = false; + DebugUtil::OnObjectEnd(); + } + if (Cmd & 0x80 && !inObjectStream) + { + inObjectStream = true; + lastPrimCmd = Cmd & 0x87; + DebugUtil::OnObjectBegin(); + } +#endif + switch(Cmd) + { + case GX_NOP: + break; + + case GX_LOAD_CP_REG: //0x08 + { + u32 SubCmd = DataReadU8(); + u32 Value = DataReadU32(); + SWLoadCPReg(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 + SWLoadIndexedXF(DataReadU32(), 0xC); + break; + case GX_LOAD_INDX_B: //used for normal matrices + SWLoadIndexedXF(DataReadU32(), 0xD); + break; + case GX_LOAD_INDX_C: //used for postmatrices + SWLoadIndexedXF(DataReadU32(), 0xE); + break; + case GX_LOAD_INDX_D: //used for lights + SWLoadIndexedXF(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(); + SWLoadBPReg(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(swstats.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); +} + +} |