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dolphin/Source/Plugins/Plugin_VideoSoftware/Src/CommandProcessor.cpp

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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 "pluginspecs_video.h"
#include "CommandProcessor.h"
#include "OpcodeDecoder.h"
#include "main.h"
#include "ChunkFile.h"
#include "MathUtil.h"
u8* g_pVideoData; // data reader uses this as the read pointer
namespace CommandProcessor
{
enum
{
GATHER_PIPE_SIZE = 32,
INT_CAUSE_CP = 0x800
};
// STATE_TO_SAVE
// variables
const int commandBufferSize = 4 * 1024;
const int commandBufferCopySize = 32;
const int maxCommandBufferWrite = commandBufferSize - commandBufferCopySize;
u8 commandBuffer[commandBufferSize];
u32 readPos;
u32 writePos;
bool interruptSet;
int et_UpdateInterrupts;
CPReg cpreg; // shared between gfx and emulator thread
void DoState(PointerWrap &p)
{
p.Do(cpreg);
}
// does it matter that there is no synchronization between threads during writes?
inline void WriteLow (u32& _reg, u16 lowbits) {_reg = (_reg & 0xFFFF0000) | lowbits;}
inline void WriteHigh(u32& _reg, u16 highbits) {_reg = (_reg & 0x0000FFFF) | ((u32)highbits << 16);}
inline u16 ReadLow (u32 _reg) {return (u16)(_reg & 0xFFFF);}
inline u16 ReadHigh (u32 _reg) {return (u16)(_reg >> 16);}
void UpdateInterrupts_Wrapper(u64 userdata, int cyclesLate)
{
UpdateInterrupts();
}
void Init()
{
cpreg.status.Hex = 0;
cpreg.status.CommandIdle = 1;
cpreg.status.ReadIdle = 1;
cpreg.ctrl.Hex = 0;
cpreg.clear.Hex = 0;
cpreg.bboxleft = 0;
cpreg.bboxtop = 0;
cpreg.bboxright = 0;
cpreg.bboxbottom = 0;
cpreg.token = 0;
et_UpdateInterrupts = g_VideoInitialize.pRegisterEvent("UpdateInterrupts", UpdateInterrupts_Wrapper);
// internal buffer position
readPos = 0;
writePos = 0;
interruptSet = false;
g_pVideoData = 0;
}
void Shutdown()
{
}
void RunGpu()
{
if (!g_VideoInitialize.bOnThread)
{
// We are going to do FP math on the main thread so have to save the current state
SaveSSEState();
LoadDefaultSSEState();
// run the opcode decoder
do {
RunBuffer();
} while (cpreg.ctrl.GPReadEnable && !cpreg.status.Breakpoint && cpreg.rwdistance >= commandBufferCopySize);
LoadSSEState();
}
}
void Read16(u16& _rReturnValue, const u32 _Address)
{
DEBUG_LOG(COMMANDPROCESSOR, "(r): 0x%08x", _Address);
u32 regAddr = (_Address & 0xFFF) >> 1;
if (regAddr < 0x20)
_rReturnValue = ((u16*)&cpreg)[regAddr];
else
_rReturnValue = 0;
}
void Write16(const u16 _Value, const u32 _Address)
{
INFO_LOG(COMMANDPROCESSOR, "(write16): 0x%04x @ 0x%08x",_Value,_Address);
switch (_Address & 0xFFF)
{
case STATUS_REGISTER:
{
UCPStatusReg tmpStatus(_Value);
if (cpreg.status.Breakpoint != tmpStatus.Breakpoint)
INFO_LOG(COMMANDPROCESSOR,"Set breakpoint status by writing to STATUS_REGISTER");
cpreg.status.Hex = _Value;
INFO_LOG(COMMANDPROCESSOR,"\t write to STATUS_REGISTER : %04x", _Value);
UpdateInterrupts();
}
break;
case CTRL_REGISTER:
{
cpreg.ctrl.Hex = _Value;
// clear breakpoint if BPEnable and CPIntEnable are 0
if (!cpreg.ctrl.BPEnable) {
if (!cpreg.ctrl.BreakPointIntEnable) {
cpreg.status.Breakpoint = 0;
}
}
DEBUG_LOG(COMMANDPROCESSOR,"\t write to CTRL_REGISTER : %04x", _Value);
DEBUG_LOG(COMMANDPROCESSOR, "\t GPREAD %s | CPULINK %s | BP %s || BPIntEnable %s | OvF %s | UndF %s"
, cpreg.ctrl.GPReadEnable ? "ON" : "OFF"
, cpreg.ctrl.GPLinkEnable ? "ON" : "OFF"
, cpreg.ctrl.BPEnable ? "ON" : "OFF"
, cpreg.ctrl.BreakPointIntEnable ? "ON" : "OFF"
, cpreg.ctrl.FifoOverflowIntEnable ? "ON" : "OFF"
, cpreg.ctrl.FifoUnderflowIntEnable ? "ON" : "OFF"
);
UpdateInterrupts();
}
break;
case CLEAR_REGISTER:
{
UCPClearReg tmpClear(_Value);
if (tmpClear.ClearFifoOverflow)
cpreg.status.OverflowHiWatermark = 0;
if (tmpClear.ClearFifoUnderflow)
cpreg.status.UnderflowLoWatermark = 0;
INFO_LOG(COMMANDPROCESSOR,"\t write to CLEAR_REGISTER : %04x",_Value);
UpdateInterrupts();
}
break;
// Fifo Registers
case FIFO_TOKEN_REGISTER:
cpreg.token = _Value;
DEBUG_LOG(COMMANDPROCESSOR,"\t write to FIFO_TOKEN_REGISTER : %04x", _Value);
break;
case FIFO_BASE_LO:
WriteLow ((u32 &)cpreg.fifobase, _Value);
DEBUG_LOG(COMMANDPROCESSOR,"\t write to FIFO_BASE_LO. FIFO base is : %08x", cpreg.fifobase);
break;
case FIFO_BASE_HI:
WriteHigh((u32 &)cpreg.fifobase, _Value);
DEBUG_LOG(COMMANDPROCESSOR,"\t write to FIFO_BASE_HI. FIFO base is : %08x", cpreg.fifobase);
break;
case FIFO_END_LO:
WriteLow ((u32 &)cpreg.fifoend, _Value);
DEBUG_LOG(COMMANDPROCESSOR,"\t write to FIFO_END_LO. FIFO end is : %08x", cpreg.fifoend);
break;
case FIFO_END_HI:
WriteHigh((u32 &)cpreg.fifoend, _Value);
DEBUG_LOG(COMMANDPROCESSOR,"\t write to FIFO_END_HI. FIFO end is : %08x", cpreg.fifoend);
break;
case FIFO_WRITE_POINTER_LO:
WriteLow ((u32 &)cpreg.writeptr, _Value);
DEBUG_LOG(COMMANDPROCESSOR,"\t write to FIFO_WRITE_POINTER_LO. write ptr is : %08x", cpreg.writeptr);
break;
case FIFO_WRITE_POINTER_HI:
WriteHigh ((u32 &)cpreg.writeptr, _Value);
DEBUG_LOG(COMMANDPROCESSOR,"\t write to FIFO_WRITE_POINTER_HI. write ptr is : %08x", cpreg.writeptr);
break;
case FIFO_READ_POINTER_LO:
WriteLow ((u32 &)cpreg.readptr, _Value);
DEBUG_LOG(COMMANDPROCESSOR,"\t write to FIFO_READ_POINTER_LO. read ptr is : %08x", cpreg.readptr);
break;
case FIFO_READ_POINTER_HI:
WriteHigh ((u32 &)cpreg.readptr, _Value);
DEBUG_LOG(COMMANDPROCESSOR,"\t write to FIFO_READ_POINTER_HI. read ptr is : %08x", cpreg.readptr);
break;
case FIFO_HI_WATERMARK_LO:
WriteLow ((u32 &)cpreg.hiwatermark, _Value);
DEBUG_LOG(COMMANDPROCESSOR,"\t write to FIFO_HI_WATERMARK_LO. hiwatermark is : %08x", cpreg.hiwatermark);
break;
case FIFO_HI_WATERMARK_HI:
WriteHigh ((u32 &)cpreg.hiwatermark, _Value);
DEBUG_LOG(COMMANDPROCESSOR,"\t write to FIFO_HI_WATERMARK_HI. hiwatermark is : %08x", cpreg.hiwatermark);
break;
case FIFO_LO_WATERMARK_LO:
WriteLow ((u32 &)cpreg.lowatermark, _Value);
DEBUG_LOG(COMMANDPROCESSOR,"\t write to FIFO_LO_WATERMARK_LO. lowatermark is : %08x", cpreg.lowatermark);
break;
case FIFO_LO_WATERMARK_HI:
WriteHigh ((u32 &)cpreg.lowatermark, _Value);
DEBUG_LOG(COMMANDPROCESSOR,"\t write to FIFO_LO_WATERMARK_HI. lowatermark is : %08x", cpreg.lowatermark);
break;
case FIFO_BP_LO:
WriteLow ((u32 &)cpreg.breakpt, _Value);
DEBUG_LOG(COMMANDPROCESSOR,"\t write to FIFO_BP_LO. breakpt is : %08x", cpreg.breakpt);
break;
case FIFO_BP_HI:
WriteHigh ((u32 &)cpreg.breakpt, _Value);
DEBUG_LOG(COMMANDPROCESSOR,"\t write to FIFO_BP_HI. breakpt is : %08x", cpreg.breakpt);
break;
// Super monkey try to overwrite CPReadWriteDistance by an old saved RWD value. Which is lame for us.
// hack: We have to force CPU to think fifo is alway empty and on idle.
// When we fall here CPReadWriteDistance should be always null and the game should always want to overwrite it by 0.
// So, we can skip it.
case FIFO_RW_DISTANCE_LO:
WriteLow ((u32 &)cpreg.rwdistance, _Value);
DEBUG_LOG(COMMANDPROCESSOR,"\t write to FIFO_RW_DISTANCE_LO. rwdistance is : %08x", cpreg.rwdistance);
break;
case FIFO_RW_DISTANCE_HI:
WriteHigh ((u32 &)cpreg.rwdistance, _Value);
DEBUG_LOG(COMMANDPROCESSOR,"\t write to FIFO_RW_DISTANCE_HI. rwdistance is : %08x", cpreg.rwdistance);
break;
}
RunGpu();
}
void Read32(u32& _rReturnValue, const u32 _Address)
{
_rReturnValue = 0;
_dbg_assert_msg_(COMMANDPROCESSOR, 0, "Read32 from CommandProccessor at 0x%08x", _Address);
}
void Write32(const u32 _Data, const u32 _Address)
{
_dbg_assert_msg_(COMMANDPROCESSOR, 0, "Write32 at CommandProccessor at 0x%08x", _Address);
}
void STACKALIGN GatherPipeBursted()
{
if (cpreg.ctrl.GPLinkEnable)
{
cpreg.writeptr += GATHER_PIPE_SIZE;
if (cpreg.writeptr >= (cpreg.fifoend & 0xFFFFFFE0))
cpreg.writeptr = cpreg.fifobase;
// the read/write pointers will be managed in RunGpu which will read the current fifo and
// send as much data as is available and the plugin can take
// this will have the cost of copying data to the plugin fifo buffer in the main thread
}
RunGpu();
}
void UpdateInterrupts()
{
bool bpInt = cpreg.status.Breakpoint && cpreg.ctrl.BreakPointIntEnable;
bool ovfInt = cpreg.status.OverflowHiWatermark && cpreg.ctrl.FifoOverflowIntEnable;
bool undfInt = cpreg.status.UnderflowLoWatermark && cpreg.ctrl.FifoUnderflowIntEnable;
DEBUG_LOG(COMMANDPROCESSOR, "\tUpdate Interrupts");
DEBUG_LOG(COMMANDPROCESSOR, "\tBreakPointIntEnable %s | BP %s | OvF %s | UndF %s"
, cpreg.ctrl.BreakPointIntEnable ? "ON" : "OFF"
, cpreg.ctrl.BPEnable ? "ON" : "OFF"
, cpreg.ctrl.FifoOverflowIntEnable ? "ON" : "OFF"
, cpreg.ctrl.FifoUnderflowIntEnable ? "ON" : "OFF"
);
interruptSet = bpInt || ovfInt || undfInt;
if (interruptSet)
{
DEBUG_LOG(COMMANDPROCESSOR,"Interrupt set");
g_VideoInitialize.pSetInterrupt(INT_CAUSE_CP, true);
}
else
{
DEBUG_LOG(COMMANDPROCESSOR,"Interrupt cleared");
g_VideoInitialize.pSetInterrupt(INT_CAUSE_CP, false);
}
}
void UpdateInterruptsFromVideoPlugin()
{
g_VideoInitialize.pScheduleEvent_Threadsafe(0, et_UpdateInterrupts, 0);
}
void ReadFifo()
{
cpreg.status.ReadIdle = 0;
// update rwdistance
u32 writePtr = cpreg.writeptr;
if (cpreg.readptr <= writePtr)
cpreg.rwdistance = writePtr - cpreg.readptr;
else
cpreg.rwdistance = ((cpreg.fifoend & 0xFFFFFFE0) - cpreg.fifobase) - (cpreg.readptr - writePtr);
// overflow check
cpreg.status.OverflowHiWatermark = cpreg.rwdistance < cpreg.hiwatermark?0:1;
// read from fifo
u8 *ptr = g_VideoInitialize.pGetMemoryPointer(cpreg.readptr);
u32 readptr = cpreg.readptr;
u32 distance = cpreg.rwdistance;
while (distance >= commandBufferCopySize && !cpreg.status.Breakpoint && writePos < maxCommandBufferWrite)
{
// check for breakpoint
// todo - check if this is precise enough
if (cpreg.ctrl.BPEnable && (cpreg.breakpt & 0xFFFFFFE0) == (readptr & 0xFFFFFFE0))
{
cpreg.status.Breakpoint = 1;
DEBUG_LOG(VIDEO,"Hit breakpoint at %x", readptr);
}
else
{
// copy to buffer
memcpy(&commandBuffer[writePos], ptr, commandBufferCopySize);
writePos += commandBufferCopySize;
ptr += commandBufferCopySize;
readptr += commandBufferCopySize;
distance -= commandBufferCopySize;
}
if (readptr >= (cpreg.fifoend & 0xFFFFFFE0))
{
readptr = cpreg.fifobase;
ptr = g_VideoInitialize.pGetMemoryPointer(readptr);
}
}
// lock read pointer until rw distance is updated?
cpreg.readptr = readptr;
cpreg.rwdistance = distance;
// underflow check
cpreg.status.UnderflowLoWatermark = cpreg.rwdistance > cpreg.lowatermark?0:1;
cpreg.status.ReadIdle = 1;
bool bpInt = cpreg.status.Breakpoint && cpreg.ctrl.BreakPointIntEnable;
bool ovfInt = cpreg.status.OverflowHiWatermark && cpreg.ctrl.FifoOverflowIntEnable;
bool undfInt = cpreg.status.UnderflowLoWatermark && cpreg.ctrl.FifoUnderflowIntEnable;
bool interrupt = bpInt || ovfInt || undfInt;
if (interrupt != interruptSet)
{
interruptSet = interrupt;
UpdateInterruptsFromVideoPlugin();
}
}
bool RunBuffer()
{
// fifo is read 32 bytes at a time
// read fifo data to internal buffer
if (cpreg.ctrl.GPReadEnable)
ReadFifo();
g_pVideoData = &commandBuffer[readPos];
u32 availableBytes = writePos - readPos;
_dbg_assert_(VIDEO, writePos >= readPos);
while (OpcodeDecoder::CommandRunnable(availableBytes))
{
cpreg.status.CommandIdle = 0;
OpcodeDecoder::Run(availableBytes);
// if data was read by the opcode decoder then the video data pointer changed
readPos = g_pVideoData - &commandBuffer[0];
_dbg_assert_(VIDEO, writePos >= readPos);
availableBytes = writePos - readPos;
}
cpreg.status.CommandIdle = 1;
_dbg_assert_(VIDEO, writePos >= readPos);
bool ranDecoder = false;
// move data remaing in command buffer
if (readPos > 0)
{
memmove(&commandBuffer[0], &commandBuffer[readPos], availableBytes);
writePos -= readPos;
readPos = 0;
ranDecoder = true;
}
return ranDecoder;
}
} // end of namespace CommandProcessor
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