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well, GX FIFO base. noting that for now, it doesn't do much beyond getting full real quick.

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also make ROM loading fail gracefully if it shits itself, instead of entering an endless loop.
This commit is contained in:
StapleButter
2017-02-07 23:31:21 +01:00
parent 2b7fac05c7
commit 971e7b7e89
7 changed files with 218 additions and 20 deletions
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174
GPU3D.cpp
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@ -26,6 +26,43 @@
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;
@ -36,6 +73,10 @@ typedef struct
FIFO<CmdFIFOEntry>* CmdFIFO;
FIFO<CmdFIFOEntry>* CmdPIPE;
u32 NumCommands, CurCommand, ParamCount, TotalParams;
u32 GXStat;
bool Init()
{
@ -55,6 +96,139 @@ 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;
}
}
}