public VifEmulator()
{
memory = new VuVector[1024];
for (int i = 0; i < memory.Length; ++i)
{
memory[i] = new VuVector();
}
registers = new VifRegisters();
}
public static VuVector[] ReadBoundingBox(this BinaryReader br)
{
var box = new VuVector[8];
for (int i = 0; i < box.Length; ++i)
{
box[i] = br.ReadV4_32();
}
return(box);
}
void ProcessVifCodeUnpack(BinaryReader br)
{
var vifcode = (VifCodeUnpack)registers.Code;
registers.Num = vifcode.Num;
//Console.WriteLine($"VIFcode: {VifCodeCmd.Unpack} vn={vifcode.Vn} vl={vifcode.Vl} NUM={vifcode.Num} ADDR={vifcode.Address:x4} FLG={vifcode.Flag} USN={vifcode.Unsigned} m={vifcode.Mask}");
int addr = (int)((vifcode.Flag ? registers.TopS : 0) + vifcode.Address);
int cycle = 0;
bool isV4_5 = vifcode.Vn == VifUnpackVnType.V4 && vifcode.Vl == VifUnpackVlType.L_5;
while (registers.Num > 0)
{
VuVector result = default;
bool doSkip = false;
bool doMode;
bool doMask;
if (registers.CycleCl >= registers.CycleWl)
{
doMode = true;
doMask = false;
// Skipping write
if (cycle < registers.CycleWl)
{
// Write when under write limit
result = br.ReadOneVifCodeUnpack(vifcode);
}
if (cycle == registers.CycleWl - 1)
{
doSkip = true;
}
}
else
{
// Filling write
throw new NotImplementedException("Filling write not implemented");
}
// Write result
result = ApplyMaskAndMode(result, doMode && !isV4_5, doMask);
memory[addr++] = result;
--registers.Num;
// TODO: figure out the proper behavior for filling write
if (doSkip)
{
addr += registers.CycleCl - registers.CycleWl;
cycle = 0;
}
else
{
++cycle;
}
}
}
VuVector ApplyMaskAndMode(VuVector vector, bool doMode, bool doMask)
{
if (!doMode && !doMask)
{
return(vector);
}
uint x = vector.X.Packed;
uint y = vector.Y.Packed;
uint z = vector.Z.Packed;
uint w = vector.W.Packed;
if (doMask)
{
throw new NotImplementedException("Masking not implemented");
}
if (doMode)
{
switch (registers.ModeMod)
{
case VifMode.None:
break;
default:
throw new NotImplementedException("Addition decompression write not implemented");
}
}
return(new VuVector
{
X = new VuFloat {
Packed = x
},
Y = new VuFloat {
Packed = y
},
Z = new VuFloat {
Packed = z
},
W = new VuFloat {
Packed = w
},
});
}