Differential D2522 Diff 13243 ps/trunk/source/lib/tex/tex_dds.cpp

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ps/trunk/source/lib/tex/tex_dds.cpp

/* Copyright (C) 2019 Wildfire Games.		/* Copyright (C) 2020 Wildfire Games.
*		*
* Permission is hereby granted, free of charge, to any person obtaining		* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the		* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including		* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,		* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to		* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to		* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:		* the following conditions:
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}		}


//-----------------------------------------------------------------------------		//-----------------------------------------------------------------------------
// DDS file format		// DDS file format
//-----------------------------------------------------------------------------		//-----------------------------------------------------------------------------

// bit values and structure definitions taken from		// bit values and structure definitions taken from
// http://msdn.microsoft.com/en-us/library/ee417785(VS.85).aspx		// https://docs.microsoft.com/en-us/windows/win32/direct3ddds/dx-graphics-dds-reference

#pragma pack(push, 1)		#pragma pack(push, 1)

// DDS_PIXELFORMAT.dwFlags		// DDS_PIXELFORMAT.dwFlags

		// This is used to distinguish RGBA from RGB and DXT1a from DXT1.
// we've seen some DXT3 files that don't have this set (which is nonsense;		// we've seen some DXT3 files that don't have this set (which is nonsense;
// any image lacking alpha should be stored as DXT1).		// any image lacking alpha should be stored as DXT1).
#define DDPF_ALPHAPIXELS 0x00000001		#define DDPF_ALPHAPIXELS 0x00000001
// DDPF_ALPHA is used instead of DDPF_ALPHAPIXELS for DXT1a.		// DDPF_ALPHA is used for uncompressed 8bpp greyscale, in which the data
		// is stored in the alpha mask.
#define DDPF_ALPHA 0x00000002		#define DDPF_ALPHA 0x00000002
#define DDPF_FOURCC 0x00000004		#define DDPF_FOURCC 0x00000004
#define DDPF_RGB 0x00000040		#define DDPF_RGB 0x00000040

struct DDS_PIXELFORMAT		struct DDS_PIXELFORMAT
{		{
u32 dwSize; // size of structure (32)		u32 dwSize; // size of structure (32)
u32 dwFlags; // indicates which fields are valid		u32 dwFlags; // indicates which fields are valid
▲ Show 20 Lines • Show All 131 Lines • ▼ Show 20 Lines	static Status decode_pf(const DDS_PIXELFORMAT* pf, size_t& bpp, size_t& flags)
else if(pf_flags & DDPF_FOURCC)		else if(pf_flags & DDPF_FOURCC)
{		{
// set effective bpp and store DXT format in flags & TEX_DXT.		// set effective bpp and store DXT format in flags & TEX_DXT.
// no endian conversion necessary - FOURCC() takes care of that.		// no endian conversion necessary - FOURCC() takes care of that.
switch(pf->dwFourCC)		switch(pf->dwFourCC)
{		{
case FOURCC('D','X','T','1'):		case FOURCC('D','X','T','1'):
bpp = 4;		bpp = 4;
if(pf_flags & DDPF_ALPHA)		if(pf_flags & DDPF_ALPHAPIXELS)
flags \|= DXT1A \| TEX_ALPHA;		flags \|= DXT1A \| TEX_ALPHA;
else		else
flags \|= 1;		flags \|= 1;
break;		break;
case FOURCC('D','X','T','3'):		case FOURCC('D','X','T','3'):
bpp = 8;		bpp = 8;
flags \|= 3;		flags \|= 3;
flags \|= TEX_ALPHA; // see DDPF_ALPHAPIXELS decl		flags \|= TEX_ALPHA; // see DDPF_ALPHAPIXELS decl
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