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ryujinx-fork/Ryujinx/Gpu/BCn.cs

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C#
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aloha
2018-02-04 23:08:20 +00:00
using System;
using System.Drawing;
namespace Ryujinx.Gpu
{
static class BCn
{
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[] 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[] 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[] 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;
}
private static byte Clamp(float Value)
{
if (Value > 1)
{
return 0xff;
}
else if (Value < 0)
{
return 0;
}
else
{
return (byte)(Value * 0xff);
}
}
private static void CalculateBC3Alpha(byte[] Alpha)
{
for (int i = 2; i < 8; i++)
{
if (Alpha[0] > Alpha[1])
{
Alpha[i] = (byte)(((8 - i) * Alpha[0] + (i - 1) * Alpha[1]) / 7);
}
else if (i < 6)
{
Alpha[i] = (byte)(((6 - i) * Alpha[0] + (i - 1) * Alpha[1]) / 7);
}
else if (i == 6)
{
Alpha[i] = 0;
}
else /* i == 7 */
{
Alpha[i] = 0xff;
}
}
}
private static void CalculateBC3AlphaS(byte[] Alpha)
{
for (int i = 2; i < 8; i++)
{
if ((sbyte)Alpha[0] > (sbyte)Alpha[1])
{
Alpha[i] = (byte)(((8 - i) * (sbyte)Alpha[0] + (i - 1) * (sbyte)Alpha[1]) / 7);
}
else if (i < 6)
{
Alpha[i] = (byte)(((6 - i) * (sbyte)Alpha[0] + (i - 1) * (sbyte)Alpha[1]) / 7);
}
else if (i == 6)
{
Alpha[i] = 0x80;
}
else /* i == 7 */
{
Alpha[i] = 0x7f;
}
}
}
private static byte[] BCnDecodeTile(
byte[] Input,
int Offset,
bool IsBC1)
{
Color[] CLUT = new Color[4];
int c0 = Get16(Input, Offset + 0);
int c1 = Get16(Input, Offset + 2);
CLUT[0] = DecodeRGB565(c0);
CLUT[1] = DecodeRGB565(c1);
CLUT[2] = CalculateCLUT2(CLUT[0], CLUT[1], c0, c1, IsBC1);
CLUT[3] = CalculateCLUT3(CLUT[0], CLUT[1], c0, c1, IsBC1);
int Indices = Get32(Input, Offset + 4);
int IdxShift = 0;
byte[] Output = new byte[4 * 4 * 4];
int OOffset = 0;
for (int TY = 0; TY < 4; TY++)
{
for (int TX = 0; TX < 4; TX++)
{
int Idx = (Indices >> IdxShift) & 3;
IdxShift += 2;
Color Pixel = CLUT[Idx];
Output[OOffset + 0] = Pixel.R;
Output[OOffset + 1] = Pixel.G;
Output[OOffset + 2] = Pixel.B;
Output[OOffset + 3] = Pixel.A;
OOffset += 4;
}
}
return Output;
}
private static Color CalculateCLUT2(Color C0, Color C1, int c0, int c1, bool IsBC1)
{
if (c0 > c1 || !IsBC1)
{
return Color.FromArgb(
(2 * C0.R + C1.R) / 3,
(2 * C0.G + C1.G) / 3,
(2 * C0.B + C1.B) / 3);
}
else
{
return Color.FromArgb(
(C0.R + C1.R) / 2,
(C0.G + C1.G) / 2,
(C0.B + C1.B) / 2);
}
}
private static Color CalculateCLUT3(Color C0, Color C1, int c0, int c1, bool IsBC1)
{
if (c0 > c1 || !IsBC1)
{
return
Color.FromArgb(
(2 * C1.R + C0.R) / 3,
(2 * C1.G + C0.G) / 3,
(2 * C1.B + C0.B) / 3);
}
return Color.Transparent;
}
private static Color DecodeRGB565(int Value)
{
int B = ((Value >> 0) & 0x1f) << 3;
int G = ((Value >> 5) & 0x3f) << 2;
int R = ((Value >> 11) & 0x1f) << 3;
return Color.FromArgb(
R | (R >> 5),
G | (G >> 6),
B | (B >> 5));
}
private static int Get16(byte[] Data, int Address)
{
return
Data[Address + 0] << 0 |
Data[Address + 1] << 8;
}
private static int Get32(byte[] Data, int Address)
{
return
Data[Address + 0] << 0 |
Data[Address + 1] << 8 |
Data[Address + 2] << 16 |
Data[Address + 3] << 24;
}
}
}
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