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using Photon.Compression.HalfFloat;
namespace Photon.Compression;
public static class NormCompress
{
public struct NormCompressCodec
{
public readonly int bits;
public readonly float encoder;
public readonly float decoder;
public NormCompressCodec(int bits, float encoder, float decoder)
{
this.bits = bits;
this.encoder = encoder;
this.decoder = decoder;
}
}
public static NormCompressCodec[] codecForBit;
private const float NORM_COMP_ENCODE15 = 32767f;
private const float NORM_COMP_DECODE15 = 3.051851E-05f;
private const float NORM_COMP_ENCODE14 = 16383f;
private const float NORM_COMP_DECODE14 = 6.103888E-05f;
private const float NORM_COMP_ENCODE13 = 8191f;
private const float NORM_COMP_DECODE13 = 0.00012208521f;
private const float NORM_COMP_ENCODE12 = 4095f;
private const float NORM_COMP_DECODE12 = 0.00024420026f;
private const float NORM_COMP_ENCODE11 = 2047f;
private const float NORM_COMP_DECODE11 = 0.0004885198f;
private const float NORM_COMP_ENCODE10 = 1023f;
private const float NORM_COMP_DECODE10 = 0.0009775171f;
private const float NORM_COMP_ENCODE9 = 511f;
private const float NORM_COMP_DECODE9 = 0.0019569471f;
private const float NORM_COMP_ENCODE8 = 255f;
private const float NORM_COMP_DECODE8 = 0.003921569f;
private const float NORM_COMP_ENCODE7 = 127f;
private const float NORM_COMP_DECODE7 = 0.003921569f;
private const float NORM_COMP_ENCODE6 = 63f;
private const float NORM_COMP_DECODE6 = 1f / 63f;
private const float NORM_COMP_ENCODE5 = 31f;
private const float NORM_COMP_DECODE5 = 1f / 31f;
private const float NORM_COMP_ENCODE4 = 15f;
private const float NORM_COMP_DECODE4 = 1f / 15f;
private const float NORM_COMP_ENCODE3 = 7f;
private const float NORM_COMP_DECODE3 = 1f / 7f;
private const float NORM_COMP_ENCODE2 = 3f;
private const float NORM_COMP_DECODE2 = 1f / 3f;
private const float NORM_COMP_ENCODE1 = 1f;
private const float NORM_COMP_DECODE1 = 1f;
private const float NORM_COMP_ENCODE0 = 0f;
private const float NORM_COMP_DECODE0 = 0f;
static NormCompress()
{
codecForBit = new NormCompressCodec[33];
for (int i = 0; i <= 32; i++)
{
uint maxValueForBits = GetMaxValueForBits(i);
codecForBit[i] = new NormCompressCodec(i, maxValueForBits, 1f / (float)maxValueForBits);
}
}
public static uint CompressNorm(this float value, int bits)
{
value = ((value > 1f) ? 1f : ((value < 0f) ? 0f : value));
return bits switch
{
0 => 0u,
1 => (uint)value,
2 => (uint)(value * 3f),
3 => (uint)(value * 7f),
4 => (uint)(value * 15f),
5 => (uint)(value * 31f),
6 => (uint)(value * 63f),
7 => (uint)(value * 127f),
8 => (uint)(value * 255f),
9 => (uint)(value * 511f),
10 => (uint)(value * 1023f),
11 => (uint)(value * 2047f),
12 => (uint)(value * 4095f),
13 => (uint)(value * 8191f),
14 => (uint)(value * 16383f),
15 => (uint)(value * 32767f),
16 => HalfUtilities.Pack(value),
_ => (ByteConverter)value,
};
}
public static uint WriteNorm(this byte[] buffer, float value, ref int bitposition, int bits)
{
value = ((value > 1f) ? 1f : ((value < 0f) ? 0f : value));
uint num = bits switch
{
0 => 0u,
1 => (uint)value,
2 => (uint)(value * 3f),
3 => (uint)(value * 7f),
4 => (uint)(value * 15f),
5 => (uint)(value * 31f),
6 => (uint)(value * 63f),
7 => (uint)(value * 127f),
8 => (uint)(value * 255f),
9 => (uint)(value * 511f),
10 => (uint)(value * 1023f),
11 => (uint)(value * 2047f),
12 => (uint)(value * 4095f),
13 => (uint)(value * 8191f),
14 => (uint)(value * 16383f),
15 => (uint)(value * 32767f),
16 => HalfUtilities.Pack(value),
_ => (ByteConverter)value,
};
buffer.Write(num, ref bitposition, bits);
return num;
}
public static float ReadNorm(this byte[] buffer, ref int bitposition, int bits)
{
return bits switch
{
0 => 0f,
1 => (float)buffer.Read(ref bitposition, 1) * 1f,
2 => (float)buffer.Read(ref bitposition, 2) * (1f / 3f),
3 => (float)buffer.Read(ref bitposition, 3) * (1f / 7f),
4 => (float)buffer.Read(ref bitposition, 4) * (1f / 15f),
5 => (float)buffer.Read(ref bitposition, 5) * (1f / 31f),
6 => (float)buffer.Read(ref bitposition, 6) * (1f / 63f),
7 => (float)buffer.Read(ref bitposition, 7) * 0.003921569f,
8 => (float)buffer.Read(ref bitposition, 8) * 0.003921569f,
9 => (float)buffer.Read(ref bitposition, 9) * 0.0019569471f,
10 => (float)buffer.Read(ref bitposition, 10) * 0.0009775171f,
11 => (float)buffer.Read(ref bitposition, 11) * 0.0004885198f,
12 => (float)buffer.Read(ref bitposition, 12) * 0.00024420026f,
13 => (float)buffer.Read(ref bitposition, 13) * 0.00012208521f,
14 => (float)buffer.Read(ref bitposition, 14) * 6.103888E-05f,
15 => (float)buffer.Read(ref bitposition, 15) * 3.051851E-05f,
16 => buffer.ReadHalf(ref bitposition),
_ => buffer.ReadFloat(ref bitposition),
};
}
public static uint GetMaxValueForBits(int bitcount)
{
return (uint)((1L << bitcount) - 1);
}
}
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