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(DDS): added DXT3 decoder.

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This commit is contained in:
morkt 2018-01-22 21:04:06 +04:00
parent b7c32d48f0
commit 96729d8961
2 changed files with 50 additions and 0 deletions
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44
ArcFormats/DirectDraw/DxtDecoder.cs
View File

@ -56,6 +56,18 @@ namespace GameRes.Formats.DirectDraw
return m_output;
}
public byte[] UnpackDXT3 ()
{
int src = 0;
for (int y = 0; y < m_height; y += 4)
for (int x = 0; x < m_width; x += 4)
{
DecompressDXT3Block (m_input, src, y, x);
src += 16;
}
return m_output;
}
public byte[] UnpackDXT5 ()
{
int src = 0;
@ -116,6 +128,38 @@ namespace GameRes.Formats.DirectDraw
m_dxt_buffer[idx+3] = 0xFF;
}
byte[] m_alpha_data = new byte[16];
void DecompressDXT3Block (byte[] input, int src, int block_y, int block_x)
{
int alpha_pos = 0;
for (int i = 0; i < 8; ++i)
{
byte a = input[src++];
m_alpha_data[alpha_pos++] = (byte)((a & 0xF) * 17);
m_alpha_data[alpha_pos++] = (byte)((a >> 4) * 17);
}
ReadDXT1Color (input, src, 0);
ReadDXT1Color (input, src+2, 4);
for (int i = 0; i < 4; ++i)
{
m_dxt_buffer[8+i] = (byte)(((m_dxt_buffer[i] << 1) + m_dxt_buffer[4+i]) / 3);
m_dxt_buffer[12+i] = (byte)(((m_dxt_buffer[4+i] << 1) + m_dxt_buffer[i]) / 3);
}
uint map = LittleEndian.ToUInt32 (input, src+4);
for (int y = 0; y < 4 && (block_y + y) < m_height; ++y)
for (int x = 0; x < 4 && (block_x + x) < m_width; ++x)
{
int color = (int)(map & 3) << 2;
int dst = m_output_stride * (block_y + y) + (block_x + x) * 4;
m_output[dst] = m_dxt_buffer[color];
m_output[dst+1] = m_dxt_buffer[color+1];
m_output[dst+2] = m_dxt_buffer[color+2];
m_output[dst+3] = m_alpha_data[y*4+x];
map >>= 2;
}
}
void DecompressDXT5Block (byte[] input, int src, int block_y, int block_x)
{
byte alpha0 = input[src];

6
ArcFormats/DirectDraw/ImageDDS.cs
View File

@ -109,6 +109,12 @@ namespace GameRes.Formats.DirectDraw
var dxt = new DxtDecoder (input, meta);
pixels = dxt.UnpackDXT5();
}
else if ("DXT3" == meta.FourCC)
{
var input = stream.ReadBytes ((int)meta.Width * (int)meta.Height);
var dxt = new DxtDecoder (input, meta);
pixels = dxt.UnpackDXT3();
}
else if ("DXT1" == meta.FourCC)
{
var input = stream.ReadBytes ((int)meta.Width * (int)meta.Height / 2);