using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace Switch_Toolbox.Library { public class CTR_3DS { //From https://github.com/gdkchan/SPICA/blob/42c4181e198b0fd34f0a567345ee7e75b54cb58b/SPICA/PICA/Converters/TextureConverter.cs public enum PICASurfaceFormat { RGBA8, RGB8, RGBA5551, RGB565, RGBA4, LA8, HiLo8, L8, A8, LA4, L4, A4, ETC1, ETC1A4 } public static PICASurfaceFormat ConvertToPICAFormat(TEX_FORMAT GenericFormat) { switch (GenericFormat) { case TEX_FORMAT.B5G6R5_UNORM: return PICASurfaceFormat.RGB565; case TEX_FORMAT.R8G8_UNORM: return PICASurfaceFormat.RGB8; case TEX_FORMAT.B5G5R5A1_UNORM: return PICASurfaceFormat.RGBA5551; case TEX_FORMAT.B4G4R4A4_UNORM: return PICASurfaceFormat.RGBA4; case TEX_FORMAT.LA8: return PICASurfaceFormat.LA8; case TEX_FORMAT.HIL08: return PICASurfaceFormat.HiLo8; case TEX_FORMAT.L8: return PICASurfaceFormat.L8; case TEX_FORMAT.A8_UNORM: return PICASurfaceFormat.A8; case TEX_FORMAT.LA4: return PICASurfaceFormat.LA4; case TEX_FORMAT.A4: return PICASurfaceFormat.A4; case TEX_FORMAT.ETC1: return PICASurfaceFormat.ETC1; case TEX_FORMAT.ETC1_A4: return PICASurfaceFormat.ETC1A4; default: throw new NotImplementedException("Unsupported format! " + GenericFormat); } } private static int[] FmtBPP = new int[] { 32, 24, 16, 16, 16, 16, 16, 8, 8, 8, 4, 4, 4, 8 }; public static int[] SwizzleLUT = { 0, 1, 8, 9, 2, 3, 10, 11, 16, 17, 24, 25, 18, 19, 26, 27, 4, 5, 12, 13, 6, 7, 14, 15, 20, 21, 28, 29, 22, 23, 30, 31, 32, 33, 40, 41, 34, 35, 42, 43, 48, 49, 56, 57, 50, 51, 58, 59, 36, 37, 44, 45, 38, 39, 46, 47, 52, 53, 60, 61, 54, 55, 62, 63 }; public static byte[] DecodeBlock(byte[] Input, int Width, int Height, TEX_FORMAT Format) { if (Format == TEX_FORMAT.ETC1 || Format == TEX_FORMAT.ETC1_A4) return ETC1.ETC1Decompress(Input, Width, Height, Format == TEX_FORMAT.ETC1_A4); byte[] Output = new byte[Width * Height * 4]; int Increment = FmtBPP[(int)ConvertToPICAFormat(Format)] / 8; if (Increment == 0) Increment = 1; // int Increment = (int)STGenericTexture.GetBytesPerPixel(Format); int IOffset = 0; for (int TY = 0; TY < Height; TY += 8) { for (int TX = 0; TX < Width; TX += 8) { for (int Px = 0; Px < 64; Px++) { int X = SwizzleLUT[Px] & 7; int Y = (SwizzleLUT[Px] - X) >> 3; int OOffet = (TX + X + ((Height - 1 - (TY + Y)) * Width)) * 4; switch (Format) { case TEX_FORMAT.R8G8_UNORM: Output[OOffet + 0] = Input[IOffset + 3]; Output[OOffet + 1] = Input[IOffset + 2]; Output[OOffet + 2] = Input[IOffset + 1]; Output[OOffet + 3] = Input[IOffset + 0]; break; case TEX_FORMAT.R8G8B8A8_UNORM: Output[OOffet + 0] = Input[IOffset + 2]; Output[OOffet + 1] = Input[IOffset + 1]; Output[OOffet + 2] = Input[IOffset + 0]; Output[OOffet + 3] = 0xff; break; case TEX_FORMAT.B5G5R5A1_UNORM: DecodeRGBA5551(Output, OOffet, GetUShort(Input, IOffset)); break; case TEX_FORMAT.B5G6R5_UNORM: DecodeRGB565(Output, OOffet, GetUShort(Input, IOffset)); break; case TEX_FORMAT.B4G4R4A4_UNORM: DecodeRGBA4(Output, OOffet, GetUShort(Input, IOffset)); break; case TEX_FORMAT.LA8: Output[OOffet + 0] = Input[IOffset + 1]; Output[OOffet + 1] = Input[IOffset + 1]; Output[OOffet + 2] = Input[IOffset + 1]; Output[OOffet + 3] = Input[IOffset + 0]; break; case TEX_FORMAT.HIL08: Output[OOffet + 0] = Input[IOffset + 1]; Output[OOffet + 1] = Input[IOffset + 0]; Output[OOffet + 2] = 0; Output[OOffet + 3] = 0xff; break; case TEX_FORMAT.L8: Output[OOffet + 0] = Input[IOffset]; Output[OOffet + 1] = Input[IOffset]; Output[OOffet + 2] = Input[IOffset]; Output[OOffet + 3] = 0xff; break; case TEX_FORMAT.A8_UNORM: Output[OOffet + 0] = 0xff; Output[OOffet + 1] = 0xff; Output[OOffet + 2] = 0xff; Output[OOffet + 3] = Input[IOffset]; break; case TEX_FORMAT.LA4: Output[OOffet + 0] = (byte)((Input[IOffset] >> 4) | (Input[IOffset] & 0xf0)); Output[OOffet + 1] = (byte)((Input[IOffset] >> 4) | (Input[IOffset] & 0xf0)); Output[OOffet + 2] = (byte)((Input[IOffset] >> 4) | (Input[IOffset] & 0xf0)); Output[OOffet + 3] = (byte)((Input[IOffset] << 4) | (Input[IOffset] & 0x0f)); break; case TEX_FORMAT.L4: int L = (Input[IOffset >> 1] >> ((IOffset & 1) << 2)) & 0xf; Output[OOffet + 0] = (byte)((L << 4) | L); Output[OOffet + 1] = (byte)((L << 4) | L); Output[OOffet + 2] = (byte)((L << 4) | L); Output[OOffet + 3] = 0xff; break; case TEX_FORMAT.A4: int A = (Input[IOffset >> 1] >> ((IOffset & 1) << 2)) & 0xf; Output[OOffet + 0] = 0xff; Output[OOffet + 1] = 0xff; Output[OOffet + 2] = 0xff; Output[OOffet + 3] = (byte)((A << 4) | A); break; } Output[OOffet + 0] = 0xff; Output[OOffet + 1] = 0xff; Output[OOffet + 2] = 0xff; Output[OOffet + 3] = Input[IOffset]; IOffset += Increment; } } } return Output; } private static void DecodeRGB565(byte[] Buffer, int Address, ushort Value) { int R = ((Value >> 0) & 0x1f) << 3; int G = ((Value >> 5) & 0x3f) << 2; int B = ((Value >> 11) & 0x1f) << 3; SetColor(Buffer, Address, 0xff, B | (B >> 5), G | (G >> 6), R | (R >> 5)); } private static void DecodeRGBA4(byte[] Buffer, int Address, ushort Value) { int R = (Value >> 4) & 0xf; int G = (Value >> 8) & 0xf; int B = (Value >> 12) & 0xf; SetColor(Buffer, Address, (Value & 0xf) | (Value << 4), B | (B << 4), G | (G << 4), R | (R << 4)); } private static void DecodeRGBA5551(byte[] Buffer, int Address, ushort Value) { int R = ((Value >> 1) & 0x1f) << 3; int G = ((Value >> 6) & 0x1f) << 3; int B = ((Value >> 11) & 0x1f) << 3; SetColor(Buffer, Address, (Value & 1) * 0xff, B | (B >> 5), G | (G >> 5), R | (R >> 5)); } private static void SetColor(byte[] Buffer, int Address, int A, int B, int G, int R) { Buffer[Address + 0] = (byte)B; Buffer[Address + 1] = (byte)G; Buffer[Address + 2] = (byte)R; Buffer[Address + 3] = (byte)A; } private static ushort GetUShort(byte[] Buffer, int Address) { return (ushort)( Buffer[Address + 0] << 0 | Buffer[Address + 1] << 8); } } }