Files
melonDS/GPU3D.cpp
StapleButter 971e7b7e89 well, GX FIFO base. noting that for now, it doesn't do much beyond getting full real quick.
also make ROM loading fail gracefully if it shits itself, instead of entering an endless loop.
2017-02-07 23:31:21 +01:00

236 lines
4.6 KiB
C++

/*
Copyright 2016-2017 StapleButter
This file is part of melonDS.
melonDS 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, either version 3 of the License, or (at your option)
any later version.
melonDS 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 melonDS. If not, see http://www.gnu.org/licenses/.
*/
#include <stdio.h>
#include <string.h>
#include "NDS.h"
#include "GPU.h"
#include "FIFO.h"
namespace GPU3D
{
const u32 CmdNumParams[256] =
{
// 0x00
0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
// 0x10
1, 0, 1, 1, 1, 0, 16, 12, 16, 12, 9, 3, 3,
0, 0, 0,
// 0x20
1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1,
0, 0, 0, 0,
// 0x30
1, 1, 1, 1, 32,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
// 0x40
1, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
// 0x50
1,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
// 0x60
1,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
// 0x70
3, 2, 1,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
// 0x80+
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
typedef struct
{
u8 Command;
u32 Param;
} CmdFIFOEntry;
FIFO<CmdFIFOEntry>* CmdFIFO;
FIFO<CmdFIFOEntry>* CmdPIPE;
u32 NumCommands, CurCommand, ParamCount, TotalParams;
u32 GXStat;
bool Init()
{
CmdFIFO = new FIFO<CmdFIFOEntry>(256);
CmdPIPE = new FIFO<CmdFIFOEntry>(4);
return true;
}
void DeInit()
{
delete CmdFIFO;
delete CmdPIPE;
}
void Reset()
{
CmdFIFO->Clear();
CmdPIPE->Clear();
NumCommands = 0;
CurCommand = 0;
ParamCount = 0;
TotalParams = 0;
GXStat = 0;
}
void CmdFIFOWrite(CmdFIFOEntry entry)
{
printf("GX FIFO: %02X %08X\n", entry.Command, entry.Param);
if (CmdFIFO->IsEmpty() && !CmdPIPE->IsFull())
{
CmdPIPE->Write(entry);
}
else
{
if (CmdFIFO->IsFull())
{
printf("!!! GX FIFO FULL\n");
return;
}
CmdFIFO->Write(entry);
}
}
CmdFIFOEntry CmdFIFORead()
{
CmdFIFOEntry ret = CmdPIPE->Read();
if (CmdPIPE->Level() <= 2)
{
if (!CmdFIFO->IsEmpty())
CmdPIPE->Write(CmdFIFO->Read());
if (!CmdFIFO->IsEmpty())
CmdPIPE->Write(CmdFIFO->Read());
}
}
u8 Read8(u32 addr)
{
return 0;
}
u16 Read16(u32 addr)
{
return 0;
}
u32 Read32(u32 addr)
{
switch (addr)
{
case 0x04000320:
return 46; // TODO, eventually
case 0x04000600:
{
u32 fifolevel = CmdFIFO->Level();
return GXStat |
// matrix stack levels, TODO
(fifolevel << 16) |
(fifolevel < 128 ? (1<<25) : 0) |
(fifolevel == 0 ? (1<<26) : 0);
}
}
return 0;
}
void Write8(u32 addr, u8 val)
{
//
}
void Write16(u32 addr, u16 val)
{
//
}
void Write32(u32 addr, u32 val)
{
switch (addr)
{
case 0x04000600:
if (val & 0x8000) GXStat &= ~0x8000;
val &= 0xC0000000;
GXStat &= 0x3FFFFFFF;
GXStat |= val;
return;
}
if (addr >= 0x04000400 && addr < 0x04000440)
{
if (NumCommands == 0)
{
NumCommands = 4;
CurCommand = val;
ParamCount = 0;
TotalParams = CmdNumParams[CurCommand & 0xFF];
}
else
ParamCount++;
while (ParamCount == TotalParams)
{
CmdFIFOEntry entry;
entry.Command = CurCommand & 0xFF;
entry.Param = val;
CmdFIFOWrite(entry);
CurCommand >>= 8;
NumCommands--;
if (NumCommands == 0) break;
ParamCount = 0;
TotalParams = CmdNumParams[CurCommand & 0xFF];
}
}
if (addr >= 0x04000440 && addr < 0x040005CC)
{
CmdFIFOEntry entry;
entry.Command = (addr & 0x1FC) >> 2;
entry.Param = val;
CmdFIFOWrite(entry);
return;
}
}
}