public static byte[] DecodeBC3(NsGpuTexture Tex, int Offset)
{
int W = (Tex.Width + 3) / 4;
int H = (Tex.Height + 3) / 4;
byte[] Output = new byte[W * H * 64];
SwizzleAddr Swizzle = new SwizzleAddr(W, H, 4);
for (int Y = 0; Y < H; Y++)
{
for (int X = 0; X < W; X++)
{
int IOffs = Offset + Swizzle.GetSwizzledAddress128(X, Y) * 16;
byte[] Tile = BCnDecodeTile(Tex.Data, IOffs + 8, false);
byte[] Alpha = new byte[8];
Alpha[0] = Tex.Data[IOffs + 0];
Alpha[1] = Tex.Data[IOffs + 1];
CalculateBC3Alpha(Alpha);
int AlphaLow = Get32(Tex.Data, IOffs + 2);
int AlphaHigh = Get16(Tex.Data, IOffs + 6);
ulong AlphaCh = (uint)AlphaLow | (ulong)AlphaHigh << 32;
int TOffset = 0;
for (int TY = 0; TY < 4; TY++)
{
for (int TX = 0; TX < 4; TX++)
{
int OOffset = (X * 4 + TX + (Y * 4 + TY) * W * 4) * 4;
byte AlphaPx = Alpha[(AlphaCh >> (TY * 12 + TX * 3)) & 7];
Output[OOffset + 0] = Tile[TOffset + 0];
Output[OOffset + 1] = Tile[TOffset + 1];
Output[OOffset + 2] = Tile[TOffset + 2];
Output[OOffset + 3] = AlphaPx;
TOffset += 4;
}
}
}
}
return(Output);
}
public static byte[] DecodeBC4(NsGpuTexture Tex, int Offset)
{
int W = (Tex.Width + 3) / 4;
int H = (Tex.Height + 3) / 4;
byte[] Output = new byte[W * H * 64];
SwizzleAddr Swizzle = new SwizzleAddr(W, H, 8);
for (int Y = 0; Y < H; Y++)
{
for (int X = 0; X < W; X++)
{
int IOffs = Swizzle.GetSwizzledAddress64(X, Y) * 8;
byte[] Red = new byte[8];
Red[0] = Tex.Data[IOffs + 0];
Red[1] = Tex.Data[IOffs + 1];
CalculateBC3Alpha(Red);
int RedLow = Get32(Tex.Data, IOffs + 2);
int RedHigh = Get16(Tex.Data, IOffs + 6);
ulong RedCh = (uint)RedLow | (ulong)RedHigh << 32;
int TOffset = 0;
for (int TY = 0; TY < 4; TY++)
{
for (int TX = 0; TX < 4; TX++)
{
int OOffset = (X * 4 + TX + (Y * 4 + TY) * W * 4) * 4;
byte RedPx = Red[(RedCh >> (TY * 12 + TX * 3)) & 7];
Output[OOffset + 0] = RedPx;
Output[OOffset + 1] = RedPx;
Output[OOffset + 2] = RedPx;
Output[OOffset + 3] = 0xff;
TOffset += 4;
}
}
}
}
return(Output);
}
public static byte[] DecodeBC2(NsGpuTexture Tex, int Offset)
{
int W = (Tex.Width + 3) / 4;
int H = (Tex.Height + 3) / 4;
byte[] Output = new byte[W * H * 64];
SwizzleAddr Swizzle = new SwizzleAddr(W, H, 4);
for (int Y = 0; Y < H; Y++)
{
for (int X = 0; X < W; X++)
{
int IOffs = Offset + Swizzle.GetSwizzledAddress128(X, Y) * 16;
byte[] Tile = BCnDecodeTile(Tex.Data, IOffs + 8, false);
int AlphaLow = Get32(Tex.Data, IOffs + 0);
int AlphaHigh = Get32(Tex.Data, IOffs + 4);
ulong AlphaCh = (uint)AlphaLow | (ulong)AlphaHigh << 32;
int TOffset = 0;
for (int TY = 0; TY < 4; TY++)
{
for (int TX = 0; TX < 4; TX++)
{
ulong Alpha = (AlphaCh >> (TY * 16 + TX * 4)) & 0xf;
int OOffset = (X * 4 + TX + (Y * 4 + TY) * W * 4) * 4;
Output[OOffset + 0] = Tile[TOffset + 0];
Output[OOffset + 1] = Tile[TOffset + 1];
Output[OOffset + 2] = Tile[TOffset + 2];
Output[OOffset + 3] = (byte)(Alpha | (Alpha << 4));
TOffset += 4;
}
}
}
}
return(Output);
}
public static byte[] DecodeBC1(NsGpuTexture Tex, int Offset)
{
int W = (Tex.Width + 3) / 4;
int H = (Tex.Height + 3) / 4;
byte[] Output = new byte[W * H * 64];
SwizzleAddr Swizzle = new SwizzleAddr(W, H, 8);
for (int Y = 0; Y < H; Y++)
{
for (int X = 0; X < W; X++)
{
int IOffs = Offset + Swizzle.GetSwizzledAddress64(X, Y) * 8;
byte[] Tile = BCnDecodeTile(Tex.Data, IOffs, true);
int TOffset = 0;
for (int TY = 0; TY < 4; TY++)
{
for (int TX = 0; TX < 4; TX++)
{
int OOffset = (X * 4 + TX + (Y * 4 + TY) * W * 4) * 4;
Output[OOffset + 0] = Tile[TOffset + 0];
Output[OOffset + 1] = Tile[TOffset + 1];
Output[OOffset + 2] = Tile[TOffset + 2];
Output[OOffset + 3] = Tile[TOffset + 3];
TOffset += 4;
}
}
}
}
return(Output);
}
public static byte[] DecodeBC5(NsGpuTexture Tex, int Offset, bool SNorm)
{
int W = (Tex.Width + 3) / 4;
int H = (Tex.Height + 3) / 4;
byte[] Output = new byte[W * H * 64];
SwizzleAddr Swizzle = new SwizzleAddr(W, H, 4);
for (int Y = 0; Y < H; Y++)
{
for (int X = 0; X < W; X++)
{
int IOffs = Swizzle.GetSwizzledAddress128(X, Y) * 16;
byte[] Red = new byte[8];
byte[] Green = new byte[8];
Red[0] = Tex.Data[IOffs + 0];
Red[1] = Tex.Data[IOffs + 1];
Green[0] = Tex.Data[IOffs + 8];
Green[1] = Tex.Data[IOffs + 9];
if (SNorm)
{
CalculateBC3AlphaS(Red);
CalculateBC3AlphaS(Green);
}
else
{
CalculateBC3Alpha(Red);
CalculateBC3Alpha(Green);
}
int RedLow = Get32(Tex.Data, IOffs + 2);
int RedHigh = Get16(Tex.Data, IOffs + 6);
int GreenLow = Get32(Tex.Data, IOffs + 10);
int GreenHigh = Get16(Tex.Data, IOffs + 14);
ulong RedCh = (uint)RedLow | (ulong)RedHigh << 32;
ulong GreenCh = (uint)GreenLow | (ulong)GreenHigh << 32;
int TOffset = 0;
if (SNorm)
{
for (int TY = 0; TY < 4; TY++)
{
for (int TX = 0; TX < 4; TX++)
{
int Shift = TY * 12 + TX * 3;
int OOffset = (X * 4 + TX + (Y * 4 + TY) * W * 4) * 4;
byte RedPx = Red [(RedCh >> Shift) & 7];
byte GreenPx = Green[(GreenCh >> Shift) & 7];
RedPx += 0x80;
GreenPx += 0x80;
float NX = (RedPx / 255f) * 2 - 1;
float NY = (GreenPx / 255f) * 2 - 1;
float NZ = (float)Math.Sqrt(1 - (NX * NX + NY * NY));
Output[OOffset + 0] = Clamp((NZ + 1) * 0.5f);
Output[OOffset + 1] = Clamp((NY + 1) * 0.5f);
Output[OOffset + 2] = Clamp((NX + 1) * 0.5f);
Output[OOffset + 3] = 0xff;
TOffset += 4;
}
}
}
else
{
for (int TY = 0; TY < 4; TY++)
{
for (int TX = 0; TX < 4; TX++)
{
int Shift = TY * 12 + TX * 3;
int OOffset = (X * 4 + TX + (Y * 4 + TY) * W * 4) * 4;
byte RedPx = Red [(RedCh >> Shift) & 7];
byte GreenPx = Green[(GreenCh >> Shift) & 7];
Output[OOffset + 0] = RedPx;
Output[OOffset + 1] = RedPx;
Output[OOffset + 2] = RedPx;
Output[OOffset + 3] = GreenPx;
TOffset += 4;
}
}
}
}
}
return(Output);
}
