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using BCnEncoder.Shared;
namespace BCnEncoder.Encoder
{
internal unsafe class AtcBlockEncoder : BaseBcLdrBlockEncoder<AtcBlock>
{
private readonly Bc1BlockEncoder bc1BlockEncoder;
public AtcBlockEncoder()
{
bc1BlockEncoder = new Bc1BlockEncoder();
}
public override AtcBlock EncodeBlock(RawBlock4X4Rgba32 block, CompressionQuality quality)
{
var atcBlock = new AtcBlock();
// EncodeBlock with BC1 first
var bc1Block = bc1BlockEncoder.EncodeBlock(block, quality);
// Atc specific modifications to BC1
// According to http://www.guildsoftware.com/papers/2012.Converting.DXTC.to.Atc.pdf
// Change color0 from rgb565 to rgb555 with method 0
atcBlock.color0 = new ColorRgb555(bc1Block.color0.R, bc1Block.color0.G, bc1Block.color0.B);
atcBlock.color1 = bc1Block.color1;
// Remap color indices from BC1 to ATC
var remap = stackalloc byte[] { 0, 3, 1, 2 };
for (var i = 0; i < 16; i++)
{
atcBlock[i] = remap[bc1Block[i]];
}
return atcBlock;
}
/// <inheritdoc />
public override CompressionFormat EncodedFormat => CompressionFormat.Atc;
}
internal class AtcExplicitAlphaBlockEncoder : BaseBcLdrBlockEncoder<AtcExplicitAlphaBlock>
{
private readonly AtcBlockEncoder atcBlockEncoder;
public AtcExplicitAlphaBlockEncoder()
{
atcBlockEncoder = new AtcBlockEncoder();
}
public override AtcExplicitAlphaBlock EncodeBlock(RawBlock4X4Rgba32 block, CompressionQuality quality)
{
var atcBlock = atcBlockEncoder.EncodeBlock(block, quality);
// EncodeBlock alpha
var bc2AlphaBlock = new Bc2AlphaBlock();
for (var i = 0; i < 16; i++)
{
bc2AlphaBlock.SetAlpha(i, block[i].a);
}
return new AtcExplicitAlphaBlock
{
alphas = bc2AlphaBlock,
colors = atcBlock
};
}
/// <inheritdoc />
public override CompressionFormat EncodedFormat => CompressionFormat.AtcExplicitAlpha;
}
internal class AtcInterpolatedAlphaBlockEncoder : BaseBcLdrBlockEncoder<AtcInterpolatedAlphaBlock>
{
private readonly Bc4ComponentBlockEncoder bc4BlockEncoder;
private readonly AtcBlockEncoder atcBlockEncoder;
public AtcInterpolatedAlphaBlockEncoder()
{
bc4BlockEncoder = new Bc4ComponentBlockEncoder(ColorComponent.A);
atcBlockEncoder = new AtcBlockEncoder();
}
public override AtcInterpolatedAlphaBlock EncodeBlock(RawBlock4X4Rgba32 block, CompressionQuality quality)
{
var bc4Block = bc4BlockEncoder.EncodeBlock(block, quality);
var atcBlock = atcBlockEncoder.EncodeBlock(block, quality);
return new AtcInterpolatedAlphaBlock
{
alphas = bc4Block,
colors = atcBlock
};
}
/// <inheritdoc />
public override CompressionFormat EncodedFormat => CompressionFormat.AtcInterpolatedAlpha;
}
}