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(DXT): added DXT1 decoder.
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@ -2,7 +2,7 @@
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//! \date Fri Apr 14 07:34:50 2017
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//! \date Fri Apr 14 07:34:50 2017
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//! \brief DXT decompressor.
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//! \brief DXT decompressor.
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//
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//
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// Copyright (C) 2016 by morkt
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// Copyright (C) 2016-2017 by morkt
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//
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to
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// of this software and associated documentation files (the "Software"), to
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@ -44,6 +44,18 @@ namespace GameRes.Formats.DirectDraw
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m_output = new byte[m_output_stride*m_height];
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m_output = new byte[m_output_stride*m_height];
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}
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}
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public byte[] UnpackDXT1 ()
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{
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int src = 0;
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for (int y = 0; y < m_height; y += 4)
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for (int x = 0; x < m_width; x += 4)
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{
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DecompressDXT1Block (m_input, src, y, x);
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src += 8;
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}
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return m_output;
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}
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public byte[] UnpackDXT5 ()
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public byte[] UnpackDXT5 ()
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{
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{
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int src = 0;
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int src = 0;
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@ -56,14 +68,60 @@ namespace GameRes.Formats.DirectDraw
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return m_output;
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return m_output;
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}
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}
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byte[] m_dxt5_alpha = new byte[16];
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byte[] m_dxt_buffer = new byte[16];
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void DecompressDXT1Block (byte[] input, int src, int block_y, int block_x)
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{
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ReadDXT1Color (input, src, 0);
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ReadDXT1Color (input, src+2, 4);
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bool has_alpha = m_dxt_buffer[0] <= m_dxt_buffer[4]
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&& m_dxt_buffer[1] <= m_dxt_buffer[5]
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&& m_dxt_buffer[2] <= m_dxt_buffer[6];
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for (int i = 0; i < 4; ++i)
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{
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if (has_alpha)
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{
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m_dxt_buffer[8+i] = (byte)((m_dxt_buffer[i] + m_dxt_buffer[4+i]) >> 1);
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m_dxt_buffer[12+i] = 0;
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}
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else
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{
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m_dxt_buffer[8+i] = (byte)(((m_dxt_buffer[i] << 1) + m_dxt_buffer[4+i]) / 3);
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m_dxt_buffer[12+i] = (byte)(((m_dxt_buffer[4+i] << 1) + m_dxt_buffer[i]) / 3);
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}
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}
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uint map = LittleEndian.ToUInt32 (input, src+4);
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for (int y = 0; y < 4 && (block_y + y) < m_height; ++y)
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for (int x = 0; x < 4 && (block_x + x) < m_width; ++x)
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{
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int color = (int)(map & 3) << 2;
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int dst = m_output_stride * (block_y + y) + (block_x + x) * 4;
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m_output[dst] = m_dxt_buffer[color];
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m_output[dst+1] = m_dxt_buffer[color+1];
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m_output[dst+2] = m_dxt_buffer[color+2];
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m_output[dst+3] = m_dxt_buffer[color+3];
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map >>= 2;
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}
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}
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void ReadDXT1Color (byte[] input, int src, int idx)
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{
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int b = input[src] & 0x1F;
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int g = (input[src] >> 5 | input[src+1] << 3) & 0x3F;
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int r = input[src+1] >> 3;
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m_dxt_buffer[idx ] = (byte)(b << 3 | b >> 2);
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m_dxt_buffer[idx+1] = (byte)(g << 2 | g >> 4);
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m_dxt_buffer[idx+2] = (byte)(r << 3 | r >> 2);
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m_dxt_buffer[idx+3] = 0xFF;
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}
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void DecompressDXT5Block (byte[] input, int src, int block_y, int block_x)
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void DecompressDXT5Block (byte[] input, int src, int block_y, int block_x)
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{
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{
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byte alpha0 = input[src];
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byte alpha0 = input[src];
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byte alpha1 = input[src+1];
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byte alpha1 = input[src+1];
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DecompressDXT5Alpha (input, src+2, m_dxt5_alpha);
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DecompressDXT5Alpha (input, src+2, m_dxt_buffer);
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ushort color0 = LittleEndian.ToUInt16 (input, src+8);
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ushort color0 = LittleEndian.ToUInt16 (input, src+8);
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ushort color1 = LittleEndian.ToUInt16 (input, src+10);
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ushort color1 = LittleEndian.ToUInt16 (input, src+10);
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@ -87,7 +145,7 @@ namespace GameRes.Formats.DirectDraw
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for (int y = 0; y < 4 && (block_y + y) < m_height; ++y)
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for (int y = 0; y < 4 && (block_y + y) < m_height; ++y)
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for (int x = 0; x < 4 && (block_x + x) < m_width; ++x)
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for (int x = 0; x < 4 && (block_x + x) < m_width; ++x)
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{
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{
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int alpha_code = m_dxt5_alpha[4 * y + x];
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int alpha_code = m_dxt_buffer[4 * y + x];
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byte alpha;
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byte alpha;
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if (0 == alpha_code)
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if (0 == alpha_code)
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alpha = alpha0;
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alpha = alpha0;
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