diff options
| author | gdk <gab.dark.100@gmail.com> | 2019-10-13 03:02:07 -0300 |
|---|---|---|
| committer | Thog <thog@protonmail.com> | 2020-01-09 02:13:00 +0100 |
| commit | 1876b346fea647e8284a66bb6d62c38801035cff (patch) | |
| tree | 6eeff094298cda84d1613dc5ec0691e51d7b35f1 /Ryujinx.Graphics.Texture/Astc/AstcPixel.cs | |
| parent | f617fb542a0e3d36012d77a4b5acbde7b08902f2 (diff) | |
Initial work
Diffstat (limited to 'Ryujinx.Graphics.Texture/Astc/AstcPixel.cs')
| -rw-r--r-- | Ryujinx.Graphics.Texture/Astc/AstcPixel.cs | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/Ryujinx.Graphics.Texture/Astc/AstcPixel.cs b/Ryujinx.Graphics.Texture/Astc/AstcPixel.cs new file mode 100644 index 00000000..7d127878 --- /dev/null +++ b/Ryujinx.Graphics.Texture/Astc/AstcPixel.cs @@ -0,0 +1,138 @@ +using System; +using System.Diagnostics; + +namespace Ryujinx.Graphics.Texture.Astc +{ + class AstcPixel + { + public short R { get; set; } + public short G { get; set; } + public short B { get; set; } + public short A { get; set; } + + byte[] _bitDepth = new byte[4]; + + public AstcPixel(short a, short r, short g, short b) + { + A = a; + R = r; + G = g; + B = b; + + for (int i = 0; i < 4; i++) + _bitDepth[i] = 8; + } + + public void ClampByte() + { + R = Math.Min(Math.Max(R, (short)0), (short)255); + G = Math.Min(Math.Max(G, (short)0), (short)255); + B = Math.Min(Math.Max(B, (short)0), (short)255); + A = Math.Min(Math.Max(A, (short)0), (short)255); + } + + public short GetComponent(int index) + { + switch(index) + { + case 0: return A; + case 1: return R; + case 2: return G; + case 3: return B; + } + + return 0; + } + + public void SetComponent(int index, int value) + { + switch (index) + { + case 0: + A = (short)value; + break; + case 1: + R = (short)value; + break; + case 2: + G = (short)value; + break; + case 3: + B = (short)value; + break; + } + } + + public void ChangeBitDepth(byte[] depth) + { + for (int i = 0; i< 4; i++) + { + int value = ChangeBitDepth(GetComponent(i), _bitDepth[i], depth[i]); + + SetComponent(i, value); + _bitDepth[i] = depth[i]; + } + } + + short ChangeBitDepth(short value, byte oldDepth, byte newDepth) + { + Debug.Assert(newDepth <= 8); + Debug.Assert(oldDepth <= 8); + + if (oldDepth == newDepth) + { + // Do nothing + return value; + } + else if (oldDepth == 0 && newDepth != 0) + { + return (short)((1 << newDepth) - 1); + } + else if (newDepth > oldDepth) + { + return (short)BitArrayStream.Replicate(value, oldDepth, newDepth); + } + else + { + // oldDepth > newDepth + if (newDepth == 0) + { + return 0xFF; + } + else + { + byte bitsWasted = (byte)(oldDepth - newDepth); + short tempValue = value; + + tempValue = (short)((tempValue + (1 << (bitsWasted - 1))) >> bitsWasted); + tempValue = Math.Min(Math.Max((short)0, tempValue), (short)((1 << newDepth) - 1)); + + return (byte)(tempValue); + } + } + } + + public int Pack() + { + AstcPixel newPixel = new AstcPixel(A, R, G, B); + byte[] eightBitDepth = { 8, 8, 8, 8 }; + + newPixel.ChangeBitDepth(eightBitDepth); + + return (byte)newPixel.A << 24 | + (byte)newPixel.B << 16 | + (byte)newPixel.G << 8 | + (byte)newPixel.R << 0; + } + + // Adds more precision to the blue channel as described + // in C.2.14 + public static AstcPixel BlueContract(int a, int r, int g, int b) + { + return new AstcPixel((short)(a), + (short)((r + b) >> 1), + (short)((g + b) >> 1), + (short)(b)); + } + } +} |