/// <summary>
/// Compress position to integers and push it to the buffer, required bytes count: <see cref="PositionRequiredBytes"/>
/// </summary>
/// <param name="bytesStack">Buffer where position will be pushed</param>
/// <param name="position">Position to be compressed and pushed</param>
public static void PushCompressedPosition(this BytesStack bytesStack, Vector3 position)
{
//Reverse order when writing to stack
//Always use little-endian so compression and decompression are machines independent
var z = CompressPositionZ(position.z);
if (!BitConverter.IsLittleEndian)
{
z = SwapEndianness(z);
}
bytesStack.PushInt(z, PositionZRequiredBytes);
var y = CompressPositionY(position.y);
if (!BitConverter.IsLittleEndian)
{
y = SwapEndianness(y);
}
bytesStack.PushInt(y, PositionYRequiredBytes);
var x = CompressPositionX(position.x);
if (!BitConverter.IsLittleEndian)
{
x = SwapEndianness(x);
}
bytesStack.PushInt(x, PositionXRequiredBytes);
}
/// <summary>
/// Compress vector3 to integers and push it to the buffer
/// </summary>
/// <param name="bytesStack">Buffer where vector3 will be pushed</param>
/// <param name="color">Vector3 to be compressed and pushed</param>
/// <param name="minElementValue">Minimal value of the encoded vector3</param>
/// <param name="maxElementValue">Maximal value of the encoded vector3</param>
/// <param name="bytesPerElement">Bytes count that will be used per each element</param>
public static void PushCompressedVector3(this BytesStack bytesStack, Vector3 color, float minElementValue,
float maxElementValue, int bytesPerElement)
{
//Reverse order when writing to stack
//Always use little-endian so compression and decompression are machines independent
var z = CompressFloatToInt(color.z, minElementValue, maxElementValue, bytesPerElement);
if (!BitConverter.IsLittleEndian)
{
z = SwapEndianness(z);
}
bytesStack.PushInt(z, bytesPerElement);
var y = CompressFloatToInt(color.y, minElementValue, maxElementValue, bytesPerElement);
if (!BitConverter.IsLittleEndian)
{
y = SwapEndianness(y);
}
bytesStack.PushInt(y, bytesPerElement);
var x = CompressFloatToInt(color.x, minElementValue, maxElementValue, bytesPerElement);
if (!BitConverter.IsLittleEndian)
{
x = SwapEndianness(x);
}
bytesStack.PushInt(x, bytesPerElement);
}
/// <summary>
/// Compress color to integers and push it to the buffer
/// </summary>
/// <param name="bytesStack">Buffer where color will be pushed</param>
/// <param name="color">Color to be compressed and pushed</param>
/// <param name="bytesPerElement">Bytes count that will be used per each element</param>
public static void PushCompressedColor(this BytesStack bytesStack, Color color, int bytesPerElement)
{
//Reverse order when writing to stack
//Always use little-endian so compression and decompression are machines independent
var a = CompressFloatToInt(color.a, 0.0f, 1.0f, bytesPerElement);
if (!BitConverter.IsLittleEndian)
{
a = SwapEndianness(a);
}
bytesStack.PushInt(a, bytesPerElement);
var b = CompressFloatToInt(color.b, 0.0f, 1.0f, bytesPerElement);
if (!BitConverter.IsLittleEndian)
{
b = SwapEndianness(b);
}
bytesStack.PushInt(b, bytesPerElement);
var g = CompressFloatToInt(color.g, 0.0f, 1.0f, bytesPerElement);
if (!BitConverter.IsLittleEndian)
{
g = SwapEndianness(g);
}
bytesStack.PushInt(g, bytesPerElement);
var r = CompressFloatToInt(color.r, 0.0f, 1.0f, bytesPerElement);
if (!BitConverter.IsLittleEndian)
{
r = SwapEndianness(r);
}
bytesStack.PushInt(r, bytesPerElement);
}
/// <summary>
/// Compress rotation to integers and push it to the buffer, required bytes count: <see cref="RotationPrecision"/>
/// </summary>
/// <param name="bytesStack">Buffer where rotation will be pushed</param>
/// <param name="rotation">Rotation to be compressed and pushed</param>
public static void PushCompressedRotation(this BytesStack bytesStack, Quaternion rotation)
{
//Algorithm based on the "smallest three" method described at:
//http://gafferongames.com/networked-physics/snapshot-compression/
var maxIndex = (byte)0;
var maxValue = float.MinValue;
var sign = 1f;
// Find the maximum element in the quaternion
for (var i = 0; i < 4; i++)
{
var element = rotation[i];
var abs = Mathf.Abs(rotation[i]);
if (!(abs > maxValue))
{
continue;
}
// Maximum element is always compressed as positive, all other elements are negated if needed
sign = (element < 0) ? -1 : 1;
maxIndex = (byte)i;
maxValue = abs;
}
// If the maximum element is approximately equal to 1.0f all other elements are approximately equal to 0.0f and does not have to be encoded
if (Mathf.Approximately(maxValue, 1.0f))
{
//Use 4-7 indexes to determine which element is maximum and it is approximately equal to 1.0f
bytesStack.PushInt(maxIndex + 4, 1);
return;
}
//Reverse order when writing to stack
// Compress and encode only smallest three Quaternion components as little endian integers
if (maxIndex != 3)
{
var w = CompressFloatToInt(rotation.w * sign, -1.0f, 1.0f, DefaultBytesForCompressedFloat);
if (!BitConverter.IsLittleEndian)
{
w = SwapEndianness(w);
}
bytesStack.PushInt(w, DefaultBytesForCompressedFloat);
}
if (maxIndex != 2)
{
var z = CompressFloatToInt(rotation.z * sign, -1.0f, 1.0f, DefaultBytesForCompressedFloat);
if (!BitConverter.IsLittleEndian)
{
z = SwapEndianness(z);
}
bytesStack.PushInt(z, DefaultBytesForCompressedFloat);
}
if (maxIndex != 1)
{
var y = CompressFloatToInt(rotation.y * sign, -1.0f, 1.0f, DefaultBytesForCompressedFloat);
if (!BitConverter.IsLittleEndian)
{
y = SwapEndianness(y);
}
bytesStack.PushInt(y, DefaultBytesForCompressedFloat);
}
if (maxIndex != 0)
{
var x = CompressFloatToInt(rotation.x * sign, -1.0f, 1.0f, DefaultBytesForCompressedFloat);
if (!BitConverter.IsLittleEndian)
{
x = SwapEndianness(x);
}
bytesStack.PushInt(x, DefaultBytesForCompressedFloat);
}
bytesStack.PushInt(BitConverter.IsLittleEndian ? maxIndex : SwapEndianness(maxIndex), 1);
}
/// <summary>
/// Pushes the enum integer value with minimum required bytes
/// </summary>
/// <param name="bytesStack">Buffer where enum is pushed</param>
/// <param name="intValue">Enum value casted to integer</param>
/// <typeparam name="T">Enum type</typeparam>
public static void PushEnum <T>(this BytesStack bytesStack, int intValue)
where T : IComparable, IConvertible, IFormattable
{
bytesStack.PushInt(intValue, RequiredBytes <T>());
}
