1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
|
using System;
using System.Diagnostics;
namespace Ryujinx.Graphics.Texture
{
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));
}
}
}
|
