using System;

using BCnEncoder.Shared;

using BCnEncoder.Shared.Colors;

namespace BCnEncoder.Encoder

{

internal class Bc2BlockEncoder : BaseBcBlockEncoder<Bc2Block, RgbEncodingContext>

{

private static readonly Bc1BlockEncoder bc1BlockEncoder = new Bc1BlockEncoder(false, false);

public override Bc2Block EncodeBlock(in RgbEncodingContext context)

{

Bc1Block colorBlock = bc1BlockEncoder.EncodeBlock(context);

return EncodeAlpha(colorBlock, context.RawBlockVec);

}

private static Bc2Block EncodeAlpha(Bc1Block colorBlock, RawBlock4X4Vector4 rawBlock)

{

var pixels = rawBlock.AsSpan;

Bc2Block result = new Bc2Block();

result.colorBlock = colorBlock;

for (int i = 0; i < pixels.Length; i++)

{

result.SetAlpha(i, pixels[i].W);

}

return result;

}

}

}