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809 lines
23 KiB
C++
809 lines
23 KiB
C++
/*
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** ddstexture.cpp
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** Texture class for DDS images
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**
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**---------------------------------------------------------------------------
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** Copyright 2006-2016 Randy Heit
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** Copyright 2006-2019 Christoph Oelckers
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** All rights reserved.
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**
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** Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions
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** are met:
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**
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** 1. Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** 2. Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in the
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** documentation and/or other materials provided with the distribution.
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** 3. The name of the author may not be used to endorse or promote products
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** derived from this software without specific prior written permission.
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**
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** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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**---------------------------------------------------------------------------
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**
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** DDS is short for "DirectDraw Surface" and is essentially that. It's
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** interesting to us because it is a standard file format for DXTC/S3TC
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** encoded images. Look up "DDS File Reference" in the DirectX SDK or
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** the online MSDN documentation to the specs for this file format. Look up
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** "Compressed Texture Resources" for information about DXTC encoding.
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**
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** Perhaps the most important part of DXTC to realize is that every 4x4
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** pixel block can only have four different colors, and only two of those
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** are discrete. So depending on the texture, there may be very noticable
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** quality degradation, or it may look virtually indistinguishable from
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** the uncompressed texture.
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**
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** Note: Although this class supports reading RGB textures from a DDS,
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** DO NOT use DDS images with plain RGB data. PNG does everything useful
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** better. Since DDS lets the R, G, B, and A components lie anywhere in
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** the pixel data, it is fairly inefficient to process.
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*/
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#include <stdint.h>
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#include "files.h"
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#include "bitmap.h"
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#include "imagehelpers.h"
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#include "image.h"
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#include "m_png.h"
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#include "filesystem/filesystem.h"
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// Since we want this to compile under Linux too, we need to define this
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// stuff ourselves instead of including a DirectX header.
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enum
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{
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ID_DDS = MAKE_ID('D', 'D', 'S', ' '),
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ID_DXT1 = MAKE_ID('D', 'X', 'T', '1'),
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ID_DXT2 = MAKE_ID('D', 'X', 'T', '2'),
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ID_DXT3 = MAKE_ID('D', 'X', 'T', '3'),
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ID_DXT4 = MAKE_ID('D', 'X', 'T', '4'),
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ID_DXT5 = MAKE_ID('D', 'X', 'T', '5'),
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// Bits in dwFlags
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DDSD_CAPS = 0x00000001,
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DDSD_HEIGHT = 0x00000002,
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DDSD_WIDTH = 0x00000004,
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DDSD_PITCH = 0x00000008,
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DDSD_PIXELFORMAT = 0x00001000,
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DDSD_MIPMAPCOUNT = 0x00020000,
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DDSD_LINEARSIZE = 0x00080000,
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DDSD_DEPTH = 0x00800000,
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// Bits in ddpfPixelFormat
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DDPF_ALPHAPIXELS = 0x00000001,
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DDPF_FOURCC = 0x00000004,
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DDPF_RGB = 0x00000040,
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// Bits in DDSCAPS2.dwCaps1
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DDSCAPS_COMPLEX = 0x00000008,
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DDSCAPS_TEXTURE = 0x00001000,
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DDSCAPS_MIPMAP = 0x00400000,
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// Bits in DDSCAPS2.dwCaps2
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DDSCAPS2_CUBEMAP = 0x00000200,
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DDSCAPS2_CUBEMAP_POSITIVEX = 0x00000400,
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DDSCAPS2_CUBEMAP_NEGATIVEX = 0x00000800,
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DDSCAPS2_CUBEMAP_POSITIVEY = 0x00001000,
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DDSCAPS2_CUBEMAP_NEGATIVEY = 0x00002000,
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DDSCAPS2_CUBEMAP_POSITIVEZ = 0x00004000,
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DDSCAPS2_CUBEMAP_NEGATIZEZ = 0x00008000,
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DDSCAPS2_VOLUME = 0x00200000,
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};
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//==========================================================================
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//
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//
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//
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//==========================================================================
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struct DDPIXELFORMAT
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{
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uint32_t Size; // Must be 32
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uint32_t Flags;
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uint32_t FourCC;
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uint32_t RGBBitCount;
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uint32_t RBitMask, GBitMask, BBitMask;
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uint32_t RGBAlphaBitMask;
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};
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struct DDCAPS2
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{
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uint32_t Caps1, Caps2;
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uint32_t Reserved[2];
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};
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struct DDSURFACEDESC2
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{
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uint32_t Size; // Must be 124. DevIL claims some writers set it to 'DDS ' instead.
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uint32_t Flags;
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uint32_t Height;
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uint32_t Width;
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union
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{
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int32_t Pitch;
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uint32_t LinearSize;
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};
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uint32_t Depth;
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uint32_t MipMapCount;
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uint32_t Reserved1[11];
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DDPIXELFORMAT PixelFormat;
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DDCAPS2 Caps;
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uint32_t Reserved2;
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};
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struct DDSFileHeader
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{
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uint32_t Magic;
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DDSURFACEDESC2 Desc;
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};
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//==========================================================================
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//
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// A DDS image, with DXTx compression
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//
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//==========================================================================
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class FDDSTexture : public FImageSource
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{
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enum
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{
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PIX_Palette = 0,
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PIX_Alphatex = 1,
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PIX_ARGB = 2
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};
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public:
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FDDSTexture (FileReader &lump, void *surfdesc);
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void CreatePalettedPixels(uint8_t *destbuffer) override;
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protected:
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uint32_t Format;
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uint32_t RMask, GMask, BMask, AMask;
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uint8_t RShiftL, GShiftL, BShiftL, AShiftL;
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uint8_t RShiftR, GShiftR, BShiftR, AShiftR;
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int32_t Pitch;
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uint32_t LinearSize;
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static void CalcBitShift (uint32_t mask, uint8_t *lshift, uint8_t *rshift);
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void ReadRGB (FileReader &lump, uint8_t *buffer, int pixelmode);
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void DecompressDXT1 (FileReader &lump, uint8_t *buffer, int pixelmode);
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void DecompressDXT3 (FileReader &lump, bool premultiplied, uint8_t *buffer, int pixelmode);
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void DecompressDXT5 (FileReader &lump, bool premultiplied, uint8_t *buffer, int pixelmode);
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int CopyPixels(FBitmap *bmp, int conversion) override;
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friend class FTexture;
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};
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//==========================================================================
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//
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//
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//
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//==========================================================================
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static bool CheckDDS (FileReader &file)
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{
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DDSFileHeader Header;
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file.Seek(0, FileReader::SeekSet);
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if (file.Read (&Header, sizeof(Header)) != sizeof(Header))
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{
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return false;
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}
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return Header.Magic == ID_DDS &&
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(LittleLong(Header.Desc.Size) == sizeof(DDSURFACEDESC2) || Header.Desc.Size == ID_DDS) &&
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LittleLong(Header.Desc.PixelFormat.Size) == sizeof(DDPIXELFORMAT) &&
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(LittleLong(Header.Desc.Flags) & (DDSD_CAPS | DDSD_PIXELFORMAT | DDSD_WIDTH | DDSD_HEIGHT)) == (DDSD_CAPS | DDSD_PIXELFORMAT | DDSD_WIDTH | DDSD_HEIGHT) &&
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Header.Desc.Width != 0 &&
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Header.Desc.Height != 0;
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}
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//==========================================================================
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//
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//
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//
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//==========================================================================
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FImageSource *DDSImage_TryCreate (FileReader &data)
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{
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union
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{
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DDSURFACEDESC2 surfdesc;
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uint32_t byteswapping[sizeof(DDSURFACEDESC2) / 4];
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};
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if (!CheckDDS(data)) return NULL;
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data.Seek(4, FileReader::SeekSet);
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data.Read (&surfdesc, sizeof(surfdesc));
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#ifdef __BIG_ENDIAN__
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// Every single element of the header is a uint32_t
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for (unsigned int i = 0; i < sizeof(DDSURFACEDESC2) / 4; ++i)
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{
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byteswapping[i] = LittleLong(byteswapping[i]);
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}
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// Undo the byte swap for the pixel format
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surfdesc.PixelFormat.FourCC = LittleLong(surfdesc.PixelFormat.FourCC);
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#endif
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if (surfdesc.PixelFormat.Flags & DDPF_FOURCC)
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{
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// Check for supported FourCC
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if (surfdesc.PixelFormat.FourCC != ID_DXT1 &&
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surfdesc.PixelFormat.FourCC != ID_DXT2 &&
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surfdesc.PixelFormat.FourCC != ID_DXT3 &&
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surfdesc.PixelFormat.FourCC != ID_DXT4 &&
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surfdesc.PixelFormat.FourCC != ID_DXT5)
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{
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return NULL;
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}
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if (!(surfdesc.Flags & DDSD_LINEARSIZE))
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{
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return NULL;
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}
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}
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else if (surfdesc.PixelFormat.Flags & DDPF_RGB)
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{
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if ((surfdesc.PixelFormat.RGBBitCount >> 3) < 1 ||
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(surfdesc.PixelFormat.RGBBitCount >> 3) > 4)
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{
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return NULL;
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}
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if ((surfdesc.Flags & DDSD_PITCH) && (surfdesc.Pitch <= 0))
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{
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return NULL;
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}
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}
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else
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{
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return NULL;
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}
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return new FDDSTexture (data, &surfdesc);
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}
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//==========================================================================
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//
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//
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//
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//==========================================================================
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FDDSTexture::FDDSTexture (FileReader &lump, void *vsurfdesc)
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{
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DDSURFACEDESC2 *surf = (DDSURFACEDESC2 *)vsurfdesc;
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bMasked = false;
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Width = uint16_t(surf->Width);
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Height = uint16_t(surf->Height);
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if (surf->PixelFormat.Flags & DDPF_FOURCC)
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{
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Format = surf->PixelFormat.FourCC;
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Pitch = 0;
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LinearSize = surf->LinearSize;
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}
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else // DDPF_RGB
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{
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Format = surf->PixelFormat.RGBBitCount >> 3;
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CalcBitShift (RMask = surf->PixelFormat.RBitMask, &RShiftL, &RShiftR);
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CalcBitShift (GMask = surf->PixelFormat.GBitMask, &GShiftL, &GShiftR);
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CalcBitShift (BMask = surf->PixelFormat.BBitMask, &BShiftL, &BShiftR);
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if (surf->PixelFormat.Flags & DDPF_ALPHAPIXELS)
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{
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CalcBitShift (AMask = surf->PixelFormat.RGBAlphaBitMask, &AShiftL, &AShiftR);
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}
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else
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{
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AMask = 0;
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AShiftL = AShiftR = 0;
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}
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if (surf->Flags & DDSD_PITCH)
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{
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Pitch = surf->Pitch;
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}
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else
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{
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Pitch = (Width * Format + 3) & ~3;
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}
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LinearSize = Pitch * Height;
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}
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}
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//==========================================================================
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//
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// Returns the number of bits the color must be shifted to produce
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// an 8-bit value, as in:
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//
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// c = (color & mask) << lshift;
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// c |= c >> rshift;
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// c >>= 24;
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//
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// For any color of at least 4 bits, this ensures that the result
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// of the calculation for c will be fully saturated, given a maximum
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// value for the input bit mask.
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//
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//==========================================================================
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void FDDSTexture::CalcBitShift (uint32_t mask, uint8_t *lshiftp, uint8_t *rshiftp)
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{
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uint8_t shift;
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if (mask == 0)
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{
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*lshiftp = *rshiftp = 0;
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return;
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}
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shift = 0;
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while ((mask & 0x80000000) == 0)
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{
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mask <<= 1;
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shift++;
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}
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*lshiftp = shift;
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shift = 0;
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while (mask & 0x80000000)
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{
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mask <<= 1;
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shift++;
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}
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*rshiftp = shift;
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}
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//==========================================================================
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//
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//
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//
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//==========================================================================
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void FDDSTexture::CreatePalettedPixels(uint8_t *buffer)
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{
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auto lump = fileSystem.OpenFileReader(Name, 0);
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if (!lump.isOpen()) return; // Just leave the texture blank.
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lump.Seek (sizeof(DDSURFACEDESC2) + 4, FileReader::SeekSet);
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int pmode = PIX_Palette;
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if (Format >= 1 && Format <= 4) // RGB: Format is # of bytes per pixel
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{
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ReadRGB (lump, buffer, pmode);
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}
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else if (Format == ID_DXT1)
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{
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DecompressDXT1 (lump, buffer, pmode);
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}
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else if (Format == ID_DXT3 || Format == ID_DXT2)
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{
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DecompressDXT3 (lump, Format == ID_DXT2, buffer, pmode);
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}
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else if (Format == ID_DXT5 || Format == ID_DXT4)
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{
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DecompressDXT5 (lump, Format == ID_DXT4, buffer, pmode);
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}
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}
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//==========================================================================
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//
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// Note that pixel size == 8 is column-major, but 32 is row-major!
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//
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//==========================================================================
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void FDDSTexture::ReadRGB (FileReader &lump, uint8_t *buffer, int pixelmode)
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{
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uint32_t x, y;
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uint32_t amask = AMask == 0 ? 0 : 0x80000000 >> AShiftL;
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uint8_t *linebuff = new uint8_t[Pitch];
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for (y = Height; y > 0; --y)
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{
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uint8_t *buffp = linebuff;
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uint8_t *pixelp = pixelmode == PIX_ARGB ? buffer + 4 * (y - 1)*Width : buffer + y - 1;
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lump.Read (linebuff, Pitch);
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for (x = Width; x > 0; --x)
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{
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uint32_t c;
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if (Format == 4)
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{
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c = LittleLong(*(uint32_t *)buffp); buffp += 4;
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}
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else if (Format == 2)
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{
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c = LittleShort(*(uint16_t *)buffp); buffp += 2;
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}
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else if (Format == 3)
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{
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c = buffp[0] | (buffp[1] << 8) | (buffp[2] << 16); buffp += 3;
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}
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else // Format == 1
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{
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c = *buffp++;
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}
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if (pixelmode != PIX_ARGB)
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{
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if (amask == 0 || (c & amask))
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{
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uint32_t r = (c & RMask) << RShiftL; r |= r >> RShiftR;
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uint32_t g = (c & GMask) << GShiftL; g |= g >> GShiftR;
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uint32_t b = (c & BMask) << BShiftL; b |= b >> BShiftR;
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uint32_t a = (c & AMask) << AShiftL; a |= a >> AShiftR;
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*pixelp = ImageHelpers::RGBToPalette(false, r >> 24, g >> 24, b >> 24, a >> 24);
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}
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else
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{
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*pixelp = 0;
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bMasked = true;
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}
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pixelp += Height;
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}
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else
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{
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uint32_t r = (c & RMask) << RShiftL; r |= r >> RShiftR;
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uint32_t g = (c & GMask) << GShiftL; g |= g >> GShiftR;
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uint32_t b = (c & BMask) << BShiftL; b |= b >> BShiftR;
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uint32_t a = (c & AMask) << AShiftL; a |= a >> AShiftR;
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pixelp[0] = (uint8_t)(b>>24);
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pixelp[1] = (uint8_t)(g>>24);
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pixelp[2] = (uint8_t)(r>>24);
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pixelp[3] = (uint8_t)(a>>24);
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pixelp+=4;
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}
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}
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}
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delete[] linebuff;
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}
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//==========================================================================
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//
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//
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//
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//==========================================================================
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void FDDSTexture::DecompressDXT1 (FileReader &lump, uint8_t *buffer, int pixelmode)
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{
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const long blocklinelen = ((Width + 3) >> 2) << 3;
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uint8_t *blockbuff = new uint8_t[blocklinelen];
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uint8_t *block;
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PalEntry color[4];
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uint8_t palcol[4] = { 0,0,0,0 }; // shut up compiler warnings.
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int ox, oy, x, y, i;
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color[0].a = 255;
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color[1].a = 255;
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color[2].a = 255;
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for (oy = 0; oy < Height; oy += 4)
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{
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lump.Read (blockbuff, blocklinelen);
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block = blockbuff;
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for (ox = 0; ox < Width; ox += 4)
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{
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uint16_t color16[2] = { LittleShort(((uint16_t *)block)[0]), LittleShort(((uint16_t *)block)[1]) };
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// Convert color from R5G6B5 to R8G8B8.
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for (i = 1; i >= 0; --i)
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{
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color[i].r = ((color16[i] & 0xF800) >> 8) | (color16[i] >> 13);
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color[i].g = ((color16[i] & 0x07E0) >> 3) | ((color16[i] & 0x0600) >> 9);
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color[i].b = ((color16[i] & 0x001F) << 3) | ((color16[i] & 0x001C) >> 2);
|
|
}
|
|
if (color16[0] > color16[1])
|
|
{ // Four-color block: derive the other two colors.
|
|
color[2].r = (color[0].r + color[0].r + color[1].r + 1) / 3;
|
|
color[2].g = (color[0].g + color[0].g + color[1].g + 1) / 3;
|
|
color[2].b = (color[0].b + color[0].b + color[1].b + 1) / 3;
|
|
|
|
color[3].r = (color[0].r + color[1].r + color[1].r + 1) / 3;
|
|
color[3].g = (color[0].g + color[1].g + color[1].g + 1) / 3;
|
|
color[3].b = (color[0].b + color[1].b + color[1].b + 1) / 3;
|
|
color[3].a = 255;
|
|
}
|
|
else
|
|
{ // Three-color block: derive the other color.
|
|
color[2].r = (color[0].r + color[1].r) / 2;
|
|
color[2].g = (color[0].g + color[1].g) / 2;
|
|
color[2].b = (color[0].b + color[1].b) / 2;
|
|
|
|
color[3].a = color[3].b = color[3].g = color[3].r = 0;
|
|
|
|
// If you have a three-color block, presumably that transparent
|
|
// color is going to be used.
|
|
bMasked = true;
|
|
}
|
|
// Pick colors from the palette for each of the four colors.
|
|
if (pixelmode != PIX_ARGB) for (i = 3; i >= 0; --i)
|
|
{
|
|
palcol[i] = ImageHelpers::RGBToPalette(pixelmode == PIX_Alphatex, color[i]);
|
|
}
|
|
// Now decode this 4x4 block to the pixel buffer.
|
|
for (y = 0; y < 4; ++y)
|
|
{
|
|
if (oy + y >= Height)
|
|
{
|
|
break;
|
|
}
|
|
uint8_t yslice = block[4 + y];
|
|
for (x = 0; x < 4; ++x)
|
|
{
|
|
if (ox + x >= Width)
|
|
{
|
|
break;
|
|
}
|
|
int ci = (yslice >> (x + x)) & 3;
|
|
if (pixelmode != PIX_ARGB)
|
|
{
|
|
buffer[oy + y + (ox + x) * Height] = palcol[ci];
|
|
}
|
|
else
|
|
{
|
|
uint8_t * tcp = &buffer[(ox + x)*4 + (oy + y) * Width*4];
|
|
tcp[0] = color[ci].b;
|
|
tcp[1] = color[ci].g;
|
|
tcp[2] = color[ci].r;
|
|
tcp[3] = color[ci].a;
|
|
}
|
|
}
|
|
}
|
|
block += 8;
|
|
}
|
|
}
|
|
delete[] blockbuff;
|
|
}
|
|
|
|
//==========================================================================
|
|
//
|
|
// DXT3: Decompression is identical to DXT1, except every 64-bit block is
|
|
// preceded by another 64-bit block with explicit alpha values.
|
|
//
|
|
//==========================================================================
|
|
|
|
void FDDSTexture::DecompressDXT3 (FileReader &lump, bool premultiplied, uint8_t *buffer, int pixelmode)
|
|
{
|
|
const long blocklinelen = ((Width + 3) >> 2) << 4;
|
|
uint8_t *blockbuff = new uint8_t[blocklinelen];
|
|
uint8_t *block;
|
|
PalEntry color[4];
|
|
uint8_t palcol[4] = { 0,0,0,0 };
|
|
int ox, oy, x, y, i;
|
|
|
|
for (oy = 0; oy < Height; oy += 4)
|
|
{
|
|
lump.Read (blockbuff, blocklinelen);
|
|
block = blockbuff;
|
|
for (ox = 0; ox < Width; ox += 4)
|
|
{
|
|
uint16_t color16[2] = { LittleShort(((uint16_t *)block)[4]), LittleShort(((uint16_t *)block)[5]) };
|
|
|
|
// Convert color from R5G6B5 to R8G8B8.
|
|
for (i = 1; i >= 0; --i)
|
|
{
|
|
color[i].r = ((color16[i] & 0xF800) >> 8) | (color16[i] >> 13);
|
|
color[i].g = ((color16[i] & 0x07E0) >> 3) | ((color16[i] & 0x0600) >> 9);
|
|
color[i].b = ((color16[i] & 0x001F) << 3) | ((color16[i] & 0x001C) >> 2);
|
|
}
|
|
// Derive the other two colors.
|
|
color[2].r = (color[0].r + color[0].r + color[1].r + 1) / 3;
|
|
color[2].g = (color[0].g + color[0].g + color[1].g + 1) / 3;
|
|
color[2].b = (color[0].b + color[0].b + color[1].b + 1) / 3;
|
|
|
|
color[3].r = (color[0].r + color[1].r + color[1].r + 1) / 3;
|
|
color[3].g = (color[0].g + color[1].g + color[1].g + 1) / 3;
|
|
color[3].b = (color[0].b + color[1].b + color[1].b + 1) / 3;
|
|
|
|
// Pick colors from the palette for each of the four colors.
|
|
if (pixelmode != PIX_ARGB) for (i = 3; i >= 0; --i)
|
|
{
|
|
palcol[i] = ImageHelpers::RGBToPalette(pixelmode == PIX_Alphatex, color[i], false);
|
|
}
|
|
|
|
// Now decode this 4x4 block to the pixel buffer.
|
|
for (y = 0; y < 4; ++y)
|
|
{
|
|
if (oy + y >= Height)
|
|
{
|
|
break;
|
|
}
|
|
uint8_t yslice = block[12 + y];
|
|
uint16_t yalphaslice = LittleShort(((uint16_t *)block)[y]);
|
|
for (x = 0; x < 4; ++x)
|
|
{
|
|
if (ox + x >= Width)
|
|
{
|
|
break;
|
|
}
|
|
if (pixelmode == PIX_Palette)
|
|
{
|
|
buffer[oy + y + (ox + x) * Height] = ((yalphaslice >> (x*4)) & 15) < 8 ?
|
|
(bMasked = true, 0) : palcol[(yslice >> (x + x)) & 3];
|
|
}
|
|
else if (pixelmode == PIX_Alphatex)
|
|
{
|
|
int alphaval = ((yalphaslice >> (x * 4)) & 15);
|
|
int palval = palcol[(yslice >> (x + x)) & 3];
|
|
buffer[oy + y + (ox + x) * Height] = palval * alphaval / 15;
|
|
}
|
|
else
|
|
{
|
|
uint8_t * tcp = &buffer[(ox + x)*4 + (oy + y) * Width*4];
|
|
int c = (yslice >> (x + x)) & 3;
|
|
tcp[0] = color[c].b;
|
|
tcp[1] = color[c].g;
|
|
tcp[2] = color[c].r;
|
|
tcp[3] = ((yalphaslice >> (x * 4)) & 15) * 0x11;
|
|
}
|
|
}
|
|
}
|
|
block += 16;
|
|
}
|
|
}
|
|
delete[] blockbuff;
|
|
}
|
|
|
|
//==========================================================================
|
|
//
|
|
// DXT5: Decompression is identical to DXT3, except every 64-bit alpha block
|
|
// contains interpolated alpha values, similar to the 64-bit color block.
|
|
//
|
|
//==========================================================================
|
|
|
|
void FDDSTexture::DecompressDXT5 (FileReader &lump, bool premultiplied, uint8_t *buffer, int pixelmode)
|
|
{
|
|
const long blocklinelen = ((Width + 3) >> 2) << 4;
|
|
uint8_t *blockbuff = new uint8_t[blocklinelen];
|
|
uint8_t *block;
|
|
PalEntry color[4];
|
|
uint8_t palcol[4] = { 0,0,0,0 };
|
|
uint32_t yalphaslice = 0;
|
|
int ox, oy, x, y, i;
|
|
|
|
for (oy = 0; oy < Height; oy += 4)
|
|
{
|
|
lump.Read (blockbuff, blocklinelen);
|
|
block = blockbuff;
|
|
for (ox = 0; ox < Width; ox += 4)
|
|
{
|
|
uint16_t color16[2] = { LittleShort(((uint16_t *)block)[4]), LittleShort(((uint16_t *)block)[5]) };
|
|
uint8_t alpha[8];
|
|
|
|
// Calculate the eight alpha values.
|
|
alpha[0] = block[0];
|
|
alpha[1] = block[1];
|
|
|
|
if (alpha[0] >= alpha[1])
|
|
{ // Eight-alpha block: derive the other six alphas.
|
|
for (i = 0; i < 6; ++i)
|
|
{
|
|
alpha[i + 2] = ((6 - i) * alpha[0] + (i + 1) * alpha[1] + 3) / 7;
|
|
}
|
|
}
|
|
else
|
|
{ // Six-alpha block: derive the other four alphas.
|
|
for (i = 0; i < 4; ++i)
|
|
{
|
|
alpha[i + 2] = ((4 - i) * alpha[0] + (i + 1) * alpha[1] + 2) / 5;
|
|
}
|
|
alpha[6] = 0;
|
|
alpha[7] = 255;
|
|
}
|
|
|
|
// Convert color from R5G6B5 to R8G8B8.
|
|
for (i = 1; i >= 0; --i)
|
|
{
|
|
color[i].r = ((color16[i] & 0xF800) >> 8) | (color16[i] >> 13);
|
|
color[i].g = ((color16[i] & 0x07E0) >> 3) | ((color16[i] & 0x0600) >> 9);
|
|
color[i].b = ((color16[i] & 0x001F) << 3) | ((color16[i] & 0x001C) >> 2);
|
|
}
|
|
// Derive the other two colors.
|
|
color[2].r = (color[0].r + color[0].r + color[1].r + 1) / 3;
|
|
color[2].g = (color[0].g + color[0].g + color[1].g + 1) / 3;
|
|
color[2].b = (color[0].b + color[0].b + color[1].b + 1) / 3;
|
|
|
|
color[3].r = (color[0].r + color[1].r + color[1].r + 1) / 3;
|
|
color[3].g = (color[0].g + color[1].g + color[1].g + 1) / 3;
|
|
color[3].b = (color[0].b + color[1].b + color[1].b + 1) / 3;
|
|
|
|
// Pick colors from the palette for each of the four colors.
|
|
if (pixelmode != PIX_ARGB) for (i = 3; i >= 0; --i)
|
|
{
|
|
palcol[i] = ImageHelpers::RGBToPalette(pixelmode == PIX_Alphatex, color[i], false);
|
|
}
|
|
// Now decode this 4x4 block to the pixel buffer.
|
|
for (y = 0; y < 4; ++y)
|
|
{
|
|
if (oy + y >= Height)
|
|
{
|
|
break;
|
|
}
|
|
// Alpha values are stored in 3 bytes for 2 rows
|
|
if ((y & 1) == 0)
|
|
{
|
|
yalphaslice = block[y*3] | (block[y*3+1] << 8) | (block[y*3+2] << 16);
|
|
}
|
|
else
|
|
{
|
|
yalphaslice >>= 12;
|
|
}
|
|
uint8_t yslice = block[12 + y];
|
|
for (x = 0; x < 4; ++x)
|
|
{
|
|
if (ox + x >= Width)
|
|
{
|
|
break;
|
|
}
|
|
if (pixelmode == PIX_Palette)
|
|
{
|
|
buffer[oy + y + (ox + x) * Height] = alpha[((yalphaslice >> (x*3)) & 7)] < 128 ?
|
|
(bMasked = true, 0) : palcol[(yslice >> (x + x)) & 3];
|
|
}
|
|
else if (pixelmode == PIX_Alphatex)
|
|
{
|
|
int alphaval = alpha[((yalphaslice >> (x * 3)) & 7)];
|
|
int palval = palcol[(yslice >> (x + x)) & 3];
|
|
buffer[oy + y + (ox + x) * Height] = palval * alphaval / 255;
|
|
}
|
|
else
|
|
{
|
|
uint8_t * tcp = &buffer[(ox + x)*4 + (oy + y) * Width*4];
|
|
int c = (yslice >> (x + x)) & 3;
|
|
tcp[0] = color[c].b;
|
|
tcp[1] = color[c].g;
|
|
tcp[2] = color[c].r;
|
|
tcp[3] = alpha[((yalphaslice >> (x*3)) & 7)];
|
|
}
|
|
}
|
|
}
|
|
block += 16;
|
|
}
|
|
}
|
|
delete[] blockbuff;
|
|
}
|
|
|
|
//===========================================================================
|
|
//
|
|
// FDDSTexture::CopyPixels
|
|
//
|
|
//===========================================================================
|
|
|
|
int FDDSTexture::CopyPixels(FBitmap *bmp, int conversion)
|
|
{
|
|
auto lump = fileSystem.OpenFileReader(Name, 0);
|
|
if (!lump.isOpen()) return -1; // Just leave the texture blank.
|
|
|
|
uint8_t *TexBuffer = bmp->GetPixels();
|
|
|
|
lump.Seek (sizeof(DDSURFACEDESC2) + 4, FileReader::SeekSet);
|
|
|
|
if (Format >= 1 && Format <= 4) // RGB: Format is # of bytes per pixel
|
|
{
|
|
ReadRGB (lump, TexBuffer, PIX_ARGB);
|
|
}
|
|
else if (Format == ID_DXT1)
|
|
{
|
|
DecompressDXT1 (lump, TexBuffer, PIX_ARGB);
|
|
}
|
|
else if (Format == ID_DXT3 || Format == ID_DXT2)
|
|
{
|
|
DecompressDXT3 (lump, Format == ID_DXT2, TexBuffer, PIX_ARGB);
|
|
}
|
|
else if (Format == ID_DXT5 || Format == ID_DXT4)
|
|
{
|
|
DecompressDXT5 (lump, Format == ID_DXT4, TexBuffer, PIX_ARGB);
|
|
}
|
|
|
|
return -1;
|
|
}
|