/// <summary>
/// Requires <see cref="Rows"/>, <see cref="Columns"/>, <see cref="IsInteger"/>, <see cref="IsNormalized"/>, <see cref="IsUnsigned"/>, <see cref="BitsPerComponent"/>, <see cref="IsReversed"/>.
/// </summary>
/// <returns></returns>
FormatChannelCollection GetFormatChannels()
{
FormatChannel[,] channels = new FormatChannel[Rows, Columns];
FormatChannelType type;
if (IsInteger)
{
type = IsUnsigned ? FormatChannelType.UnsignedInteger : FormatChannelType.SignedInteger;
}
else if (IsNormalized)
{
type = IsUnsigned ? FormatChannelType.UnsignedNormalized : FormatChannelType.SignedNormalized;
}
else
{
type = FormatChannelType.Float;
}
for (int column = 0; column < Columns; column++)
{
for (int row = 0; row < Rows; row++)
{
FormatChannelIndex channelIndex = Columns == 1 ? FormatChannelVectorIndices[IsReversed ? 3 - row : row] : FormatChannelIndex.Cell;
FormatChannel channel = new FormatChannel(channelIndex, type, BitsPerComponent)
{
format = this,
column = column,
row = row,
};
channels[row, column] = channel;
}
}
return(new FormatChannelCollection(channels));
}
internal Format(PixelInternalFormat?internalFormat, PixelFormat format, PixelType?type, int rows, int columns, FormatChannelType channelType, int channelBits)
: this(internalFormat, format, type)
{
int realCount = (rows == -1 || rows == -2) ? 1 : (rows == -3) ? 2 : rows;
FormatChannel[,] channels = new FormatChannel[rows, columns];
if (rows == -1)
{
channels[0, 0] = new FormatChannel(FormatChannelIndex.Depth, channelType, channelBits);
}
else if (rows == -2)
{
channels[1, 0] = new FormatChannel(FormatChannelIndex.Stencil, channelType, channelBits);
}
else if (rows < 0)
{
throw new Exception();
}
else
{
for (int column = 0; column < columns; column++)
{
for (int row = 0; row < rows; row++)
{
FormatChannelIndex index;
if (columns > 1)
{
index = FormatChannelIndex.Cell;
}
else if (format == PixelFormat.Bgr || format == PixelFormat.Bgra)
{
switch (row)
{
case 0: index = FormatChannelIndex.Blue; break;
case 1: index = FormatChannelIndex.Green; break;
case 2: index = FormatChannelIndex.Red; break;
case 3: index = FormatChannelIndex.Alpha; break;
default: throw new Exception();
}
}
else
{
switch (row)
{
case 0: index = FormatChannelIndex.Red; break;
case 1: index = FormatChannelIndex.Green; break;
case 2: index = FormatChannelIndex.Blue; break;
case 3: index = FormatChannelIndex.Alpha; break;
default: throw new Exception();
}
}
channels[row, column] = new FormatChannel(index, channelType, channelBits);
}
}
}
this.channels = new FormatChannelCollection(channels);
SetupChannels();
}