712 lines
16 KiB
C++
712 lines
16 KiB
C++
// Copyright (C) 2002-2011 Thomas Alten
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// This file is part of the "Irrlicht Engine".
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// For conditions of distribution and use, see copyright notice in irrlicht.h
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/*
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Based on Code from Copyright (c) 2003 Randy Reddig
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Based on code from Nvidia's DDS example:
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http://www.nvidia.com/object/dxtc_decompression_code.html
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mainly c to cpp
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*/
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#include "CImageLoaderDDS.h"
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#ifdef _IRR_COMPILE_WITH_DDS_LOADER_
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#include "IReadFile.h"
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#include "os.h"
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#include "CColorConverter.h"
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#include "CImage.h"
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#include "irrString.h"
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namespace irr
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{
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namespace video
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{
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namespace
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{
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/*!
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DDSDecodePixelFormat()
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determines which pixel format the dds texture is in
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*/
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void DDSDecodePixelFormat( ddsBuffer *dds, eDDSPixelFormat *pf )
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{
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/* dummy check */
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if( dds == NULL || pf == NULL )
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return;
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/* extract fourCC */
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const u32 fourCC = dds->pixelFormat.fourCC;
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/* test it */
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if( fourCC == 0 )
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*pf = DDS_PF_ARGB8888;
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else if( fourCC == *((u32*) "DXT1") )
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*pf = DDS_PF_DXT1;
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else if( fourCC == *((u32*) "DXT2") )
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*pf = DDS_PF_DXT2;
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else if( fourCC == *((u32*) "DXT3") )
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*pf = DDS_PF_DXT3;
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else if( fourCC == *((u32*) "DXT4") )
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*pf = DDS_PF_DXT4;
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else if( fourCC == *((u32*) "DXT5") )
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*pf = DDS_PF_DXT5;
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else
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*pf = DDS_PF_UNKNOWN;
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}
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/*!
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DDSGetInfo()
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extracts relevant info from a dds texture, returns 0 on success
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*/
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s32 DDSGetInfo( ddsBuffer *dds, s32 *width, s32 *height, eDDSPixelFormat *pf )
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{
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/* dummy test */
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if( dds == NULL )
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return -1;
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/* test dds header */
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if( *((s32*) dds->magic) != *((s32*) "DDS ") )
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return -1;
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if( DDSLittleLong( dds->size ) != 124 )
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return -1;
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/* extract width and height */
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if( width != NULL )
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*width = DDSLittleLong( dds->width );
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if( height != NULL )
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*height = DDSLittleLong( dds->height );
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/* get pixel format */
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DDSDecodePixelFormat( dds, pf );
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/* return ok */
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return 0;
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}
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/*!
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DDSGetColorBlockColors()
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extracts colors from a dds color block
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*/
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void DDSGetColorBlockColors( ddsColorBlock *block, ddsColor colors[ 4 ] )
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{
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u16 word;
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/* color 0 */
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word = DDSLittleShort( block->colors[ 0 ] );
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colors[ 0 ].a = 0xff;
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/* extract rgb bits */
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colors[ 0 ].b = (u8) word;
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colors[ 0 ].b <<= 3;
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colors[ 0 ].b |= (colors[ 0 ].b >> 5);
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word >>= 5;
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colors[ 0 ].g = (u8) word;
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colors[ 0 ].g <<= 2;
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colors[ 0 ].g |= (colors[ 0 ].g >> 5);
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word >>= 6;
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colors[ 0 ].r = (u8) word;
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colors[ 0 ].r <<= 3;
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colors[ 0 ].r |= (colors[ 0 ].r >> 5);
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/* same for color 1 */
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word = DDSLittleShort( block->colors[ 1 ] );
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colors[ 1 ].a = 0xff;
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/* extract rgb bits */
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colors[ 1 ].b = (u8) word;
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colors[ 1 ].b <<= 3;
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colors[ 1 ].b |= (colors[ 1 ].b >> 5);
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word >>= 5;
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colors[ 1 ].g = (u8) word;
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colors[ 1 ].g <<= 2;
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colors[ 1 ].g |= (colors[ 1 ].g >> 5);
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word >>= 6;
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colors[ 1 ].r = (u8) word;
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colors[ 1 ].r <<= 3;
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colors[ 1 ].r |= (colors[ 1 ].r >> 5);
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/* use this for all but the super-freak math method */
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if( block->colors[ 0 ] > block->colors[ 1 ] )
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{
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/* four-color block: derive the other two colors.
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00 = color 0, 01 = color 1, 10 = color 2, 11 = color 3
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these two bit codes correspond to the 2-bit fields
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stored in the 64-bit block. */
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word = ((u16) colors[ 0 ].r * 2 + (u16) colors[ 1 ].r ) / 3;
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/* no +1 for rounding */
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/* as bits have been shifted to 888 */
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colors[ 2 ].r = (u8) word;
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word = ((u16) colors[ 0 ].g * 2 + (u16) colors[ 1 ].g) / 3;
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colors[ 2 ].g = (u8) word;
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word = ((u16) colors[ 0 ].b * 2 + (u16) colors[ 1 ].b) / 3;
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colors[ 2 ].b = (u8) word;
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colors[ 2 ].a = 0xff;
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word = ((u16) colors[ 0 ].r + (u16) colors[ 1 ].r * 2) / 3;
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colors[ 3 ].r = (u8) word;
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word = ((u16) colors[ 0 ].g + (u16) colors[ 1 ].g * 2) / 3;
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colors[ 3 ].g = (u8) word;
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word = ((u16) colors[ 0 ].b + (u16) colors[ 1 ].b * 2) / 3;
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colors[ 3 ].b = (u8) word;
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colors[ 3 ].a = 0xff;
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}
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else
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{
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/* three-color block: derive the other color.
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00 = color 0, 01 = color 1, 10 = color 2,
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11 = transparent.
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These two bit codes correspond to the 2-bit fields
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stored in the 64-bit block */
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word = ((u16) colors[ 0 ].r + (u16) colors[ 1 ].r) / 2;
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colors[ 2 ].r = (u8) word;
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word = ((u16) colors[ 0 ].g + (u16) colors[ 1 ].g) / 2;
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colors[ 2 ].g = (u8) word;
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word = ((u16) colors[ 0 ].b + (u16) colors[ 1 ].b) / 2;
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colors[ 2 ].b = (u8) word;
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colors[ 2 ].a = 0xff;
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/* random color to indicate alpha */
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colors[ 3 ].r = 0x00;
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colors[ 3 ].g = 0xff;
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colors[ 3 ].b = 0xff;
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colors[ 3 ].a = 0x00;
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}
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}
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/*
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DDSDecodeColorBlock()
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decodes a dds color block
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fixme: make endian-safe
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*/
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void DDSDecodeColorBlock( u32 *pixel, ddsColorBlock *block, s32 width, u32 colors[ 4 ] )
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{
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s32 r, n;
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u32 bits;
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u32 masks[] = { 3, 12, 3 << 4, 3 << 6 }; /* bit masks = 00000011, 00001100, 00110000, 11000000 */
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s32 shift[] = { 0, 2, 4, 6 };
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/* r steps through lines in y */
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for( r = 0; r < 4; r++, pixel += (width - 4) ) /* no width * 4 as u32 ptr inc will * 4 */
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{
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/* width * 4 bytes per pixel per line, each j dxtc row is 4 lines of pixels */
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/* n steps through pixels */
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for( n = 0; n < 4; n++ )
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{
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bits = block->row[ r ] & masks[ n ];
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bits >>= shift[ n ];
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switch( bits )
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{
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case 0:
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*pixel = colors[ 0 ];
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pixel++;
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break;
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case 1:
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*pixel = colors[ 1 ];
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pixel++;
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break;
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case 2:
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*pixel = colors[ 2 ];
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pixel++;
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break;
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case 3:
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*pixel = colors[ 3 ];
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pixel++;
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break;
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default:
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/* invalid */
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pixel++;
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break;
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}
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}
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}
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}
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/*
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DDSDecodeAlphaExplicit()
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decodes a dds explicit alpha block
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*/
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void DDSDecodeAlphaExplicit( u32 *pixel, ddsAlphaBlockExplicit *alphaBlock, s32 width, u32 alphaZero )
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{
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s32 row, pix;
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u16 word;
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ddsColor color;
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/* clear color */
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color.r = 0;
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color.g = 0;
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color.b = 0;
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/* walk rows */
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for( row = 0; row < 4; row++, pixel += (width - 4) )
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{
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word = DDSLittleShort( alphaBlock->row[ row ] );
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/* walk pixels */
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for( pix = 0; pix < 4; pix++ )
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{
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/* zero the alpha bits of image pixel */
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*pixel &= alphaZero;
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color.a = word & 0x000F;
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color.a = color.a | (color.a << 4);
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*pixel |= *((u32*) &color);
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word >>= 4; /* move next bits to lowest 4 */
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pixel++; /* move to next pixel in the row */
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}
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}
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}
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/*
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DDSDecodeAlpha3BitLinear()
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decodes interpolated alpha block
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*/
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void DDSDecodeAlpha3BitLinear( u32 *pixel, ddsAlphaBlock3BitLinear *alphaBlock, s32 width, u32 alphaZero )
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{
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s32 row, pix;
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u32 stuff;
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u8 bits[ 4 ][ 4 ];
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u16 alphas[ 8 ];
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ddsColor aColors[ 4 ][ 4 ];
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/* get initial alphas */
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alphas[ 0 ] = alphaBlock->alpha0;
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alphas[ 1 ] = alphaBlock->alpha1;
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/* 8-alpha block */
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if( alphas[ 0 ] > alphas[ 1 ] )
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{
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/* 000 = alpha_0, 001 = alpha_1, others are interpolated */
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alphas[ 2 ] = ( 6 * alphas[ 0 ] + alphas[ 1 ]) / 7; /* bit code 010 */
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alphas[ 3 ] = ( 5 * alphas[ 0 ] + 2 * alphas[ 1 ]) / 7; /* bit code 011 */
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alphas[ 4 ] = ( 4 * alphas[ 0 ] + 3 * alphas[ 1 ]) / 7; /* bit code 100 */
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alphas[ 5 ] = ( 3 * alphas[ 0 ] + 4 * alphas[ 1 ]) / 7; /* bit code 101 */
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alphas[ 6 ] = ( 2 * alphas[ 0 ] + 5 * alphas[ 1 ]) / 7; /* bit code 110 */
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alphas[ 7 ] = ( alphas[ 0 ] + 6 * alphas[ 1 ]) / 7; /* bit code 111 */
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}
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/* 6-alpha block */
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else
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{
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/* 000 = alpha_0, 001 = alpha_1, others are interpolated */
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alphas[ 2 ] = (4 * alphas[ 0 ] + alphas[ 1 ]) / 5; /* bit code 010 */
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alphas[ 3 ] = (3 * alphas[ 0 ] + 2 * alphas[ 1 ]) / 5; /* bit code 011 */
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alphas[ 4 ] = (2 * alphas[ 0 ] + 3 * alphas[ 1 ]) / 5; /* bit code 100 */
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alphas[ 5 ] = ( alphas[ 0 ] + 4 * alphas[ 1 ]) / 5; /* bit code 101 */
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alphas[ 6 ] = 0; /* bit code 110 */
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alphas[ 7 ] = 255; /* bit code 111 */
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}
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/* decode 3-bit fields into array of 16 bytes with same value */
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/* first two rows of 4 pixels each */
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stuff = *((u32*) &(alphaBlock->stuff[ 0 ]));
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bits[ 0 ][ 0 ] = (u8) (stuff & 0x00000007);
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stuff >>= 3;
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bits[ 0 ][ 1 ] = (u8) (stuff & 0x00000007);
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stuff >>= 3;
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bits[ 0 ][ 2 ] = (u8) (stuff & 0x00000007);
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stuff >>= 3;
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bits[ 0 ][ 3 ] = (u8) (stuff & 0x00000007);
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stuff >>= 3;
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bits[ 1 ][ 0 ] = (u8) (stuff & 0x00000007);
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stuff >>= 3;
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bits[ 1 ][ 1 ] = (u8) (stuff & 0x00000007);
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stuff >>= 3;
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bits[ 1 ][ 2 ] = (u8) (stuff & 0x00000007);
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stuff >>= 3;
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bits[ 1 ][ 3 ] = (u8) (stuff & 0x00000007);
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/* last two rows */
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stuff = *((u32*) &(alphaBlock->stuff[ 3 ])); /* last 3 bytes */
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bits[ 2 ][ 0 ] = (u8) (stuff & 0x00000007);
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stuff >>= 3;
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bits[ 2 ][ 1 ] = (u8) (stuff & 0x00000007);
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stuff >>= 3;
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bits[ 2 ][ 2 ] = (u8) (stuff & 0x00000007);
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stuff >>= 3;
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bits[ 2 ][ 3 ] = (u8) (stuff & 0x00000007);
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stuff >>= 3;
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bits[ 3 ][ 0 ] = (u8) (stuff & 0x00000007);
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stuff >>= 3;
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bits[ 3 ][ 1 ] = (u8) (stuff & 0x00000007);
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stuff >>= 3;
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bits[ 3 ][ 2 ] = (u8) (stuff & 0x00000007);
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stuff >>= 3;
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bits[ 3 ][ 3 ] = (u8) (stuff & 0x00000007);
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/* decode the codes into alpha values */
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for( row = 0; row < 4; row++ )
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{
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for( pix=0; pix < 4; pix++ )
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{
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aColors[ row ][ pix ].r = 0;
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aColors[ row ][ pix ].g = 0;
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aColors[ row ][ pix ].b = 0;
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aColors[ row ][ pix ].a = (u8) alphas[ bits[ row ][ pix ] ];
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}
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}
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/* write out alpha values to the image bits */
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for( row = 0; row < 4; row++, pixel += width-4 )
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{
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for( pix = 0; pix < 4; pix++ )
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{
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/* zero the alpha bits of image pixel */
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*pixel &= alphaZero;
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/* or the bits into the prev. nulled alpha */
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*pixel |= *((u32*) &(aColors[ row ][ pix ]));
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pixel++;
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}
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}
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}
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/*
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DDSDecompressDXT1()
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decompresses a dxt1 format texture
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*/
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s32 DDSDecompressDXT1( ddsBuffer *dds, s32 width, s32 height, u8 *pixels )
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{
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s32 x, y, xBlocks, yBlocks;
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u32 *pixel;
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ddsColorBlock *block;
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ddsColor colors[ 4 ];
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/* setup */
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xBlocks = width / 4;
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yBlocks = height / 4;
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/* walk y */
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for( y = 0; y < yBlocks; y++ )
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{
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/* 8 bytes per block */
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block = (ddsColorBlock*) (dds->data + y * xBlocks * 8);
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/* walk x */
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for( x = 0; x < xBlocks; x++, block++ )
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{
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DDSGetColorBlockColors( block, colors );
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pixel = (u32*) (pixels + x * 16 + (y * 4) * width * 4);
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DDSDecodeColorBlock( pixel, block, width, (u32*) colors );
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}
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}
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/* return ok */
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return 0;
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}
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/*
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DDSDecompressDXT3()
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decompresses a dxt3 format texture
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*/
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s32 DDSDecompressDXT3( ddsBuffer *dds, s32 width, s32 height, u8 *pixels )
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{
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s32 x, y, xBlocks, yBlocks;
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u32 *pixel, alphaZero;
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ddsColorBlock *block;
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ddsAlphaBlockExplicit *alphaBlock;
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ddsColor colors[ 4 ];
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/* setup */
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xBlocks = width / 4;
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yBlocks = height / 4;
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/* create zero alpha */
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colors[ 0 ].a = 0;
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colors[ 0 ].r = 0xFF;
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colors[ 0 ].g = 0xFF;
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colors[ 0 ].b = 0xFF;
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alphaZero = *((u32*) &colors[ 0 ]);
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/* walk y */
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for( y = 0; y < yBlocks; y++ )
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{
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/* 8 bytes per block, 1 block for alpha, 1 block for color */
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block = (ddsColorBlock*) (dds->data + y * xBlocks * 16);
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/* walk x */
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for( x = 0; x < xBlocks; x++, block++ )
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{
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/* get alpha block */
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alphaBlock = (ddsAlphaBlockExplicit*) block;
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/* get color block */
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block++;
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DDSGetColorBlockColors( block, colors );
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/* decode color block */
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pixel = (u32*) (pixels + x * 16 + (y * 4) * width * 4);
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DDSDecodeColorBlock( pixel, block, width, (u32*) colors );
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/* overwrite alpha bits with alpha block */
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DDSDecodeAlphaExplicit( pixel, alphaBlock, width, alphaZero );
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}
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}
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/* return ok */
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return 0;
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}
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/*
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DDSDecompressDXT5()
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decompresses a dxt5 format texture
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*/
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s32 DDSDecompressDXT5( ddsBuffer *dds, s32 width, s32 height, u8 *pixels )
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{
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s32 x, y, xBlocks, yBlocks;
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u32 *pixel, alphaZero;
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ddsColorBlock *block;
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ddsAlphaBlock3BitLinear *alphaBlock;
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ddsColor colors[ 4 ];
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/* setup */
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xBlocks = width / 4;
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yBlocks = height / 4;
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/* create zero alpha */
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colors[ 0 ].a = 0;
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colors[ 0 ].r = 0xFF;
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colors[ 0 ].g = 0xFF;
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colors[ 0 ].b = 0xFF;
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alphaZero = *((u32*) &colors[ 0 ]);
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/* walk y */
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for( y = 0; y < yBlocks; y++ )
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{
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/* 8 bytes per block, 1 block for alpha, 1 block for color */
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block = (ddsColorBlock*) (dds->data + y * xBlocks * 16);
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/* walk x */
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for( x = 0; x < xBlocks; x++, block++ )
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{
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/* get alpha block */
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alphaBlock = (ddsAlphaBlock3BitLinear*) block;
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/* get color block */
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block++;
|
|
DDSGetColorBlockColors( block, colors );
|
|
|
|
/* decode color block */
|
|
pixel = (u32*) (pixels + x * 16 + (y * 4) * width * 4);
|
|
DDSDecodeColorBlock( pixel, block, width, (u32*) colors );
|
|
|
|
/* overwrite alpha bits with alpha block */
|
|
DDSDecodeAlpha3BitLinear( pixel, alphaBlock, width, alphaZero );
|
|
}
|
|
}
|
|
|
|
/* return ok */
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
DDSDecompressDXT2()
|
|
decompresses a dxt2 format texture (fixme: un-premultiply alpha)
|
|
*/
|
|
s32 DDSDecompressDXT2( ddsBuffer *dds, s32 width, s32 height, u8 *pixels )
|
|
{
|
|
/* decompress dxt3 first */
|
|
const s32 r = DDSDecompressDXT3( dds, width, height, pixels );
|
|
|
|
/* return to sender */
|
|
return r;
|
|
}
|
|
|
|
|
|
/*
|
|
DDSDecompressDXT4()
|
|
decompresses a dxt4 format texture (fixme: un-premultiply alpha)
|
|
*/
|
|
s32 DDSDecompressDXT4( ddsBuffer *dds, s32 width, s32 height, u8 *pixels )
|
|
{
|
|
/* decompress dxt5 first */
|
|
const s32 r = DDSDecompressDXT5( dds, width, height, pixels );
|
|
|
|
/* return to sender */
|
|
return r;
|
|
}
|
|
|
|
|
|
/*
|
|
DDSDecompressARGB8888()
|
|
decompresses an argb 8888 format texture
|
|
*/
|
|
s32 DDSDecompressARGB8888( ddsBuffer *dds, s32 width, s32 height, u8 *pixels )
|
|
{
|
|
/* setup */
|
|
u8* in = dds->data;
|
|
u8* out = pixels;
|
|
|
|
/* walk y */
|
|
for(s32 y = 0; y < height; y++)
|
|
{
|
|
/* walk x */
|
|
for(s32 x = 0; x < width; x++)
|
|
{
|
|
*out++ = *in++;
|
|
*out++ = *in++;
|
|
*out++ = *in++;
|
|
*out++ = *in++;
|
|
}
|
|
}
|
|
|
|
/* return ok */
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
DDSDecompress()
|
|
decompresses a dds texture into an rgba image buffer, returns 0 on success
|
|
*/
|
|
s32 DDSDecompress( ddsBuffer *dds, u8 *pixels )
|
|
{
|
|
s32 width, height;
|
|
eDDSPixelFormat pf;
|
|
|
|
/* get dds info */
|
|
s32 r = DDSGetInfo( dds, &width, &height, &pf );
|
|
if ( r )
|
|
return r;
|
|
|
|
/* decompress */
|
|
switch( pf )
|
|
{
|
|
case DDS_PF_ARGB8888:
|
|
/* fixme: support other [a]rgb formats */
|
|
r = DDSDecompressARGB8888( dds, width, height, pixels );
|
|
break;
|
|
|
|
case DDS_PF_DXT1:
|
|
r = DDSDecompressDXT1( dds, width, height, pixels );
|
|
break;
|
|
|
|
case DDS_PF_DXT2:
|
|
r = DDSDecompressDXT2( dds, width, height, pixels );
|
|
break;
|
|
|
|
case DDS_PF_DXT3:
|
|
r = DDSDecompressDXT3( dds, width, height, pixels );
|
|
break;
|
|
|
|
case DDS_PF_DXT4:
|
|
r = DDSDecompressDXT4( dds, width, height, pixels );
|
|
break;
|
|
|
|
case DDS_PF_DXT5:
|
|
r = DDSDecompressDXT5( dds, width, height, pixels );
|
|
break;
|
|
|
|
default:
|
|
case DDS_PF_UNKNOWN:
|
|
memset( pixels, 0xFF, width * height * 4 );
|
|
r = -1;
|
|
break;
|
|
}
|
|
|
|
/* return to sender */
|
|
return r;
|
|
}
|
|
|
|
} // end anonymous namespace
|
|
|
|
|
|
//! returns true if the file maybe is able to be loaded by this class
|
|
//! based on the file extension (e.g. ".tga")
|
|
bool CImageLoaderDDS::isALoadableFileExtension(const io::path& filename) const
|
|
{
|
|
return core::hasFileExtension ( filename, "dds" );
|
|
}
|
|
|
|
|
|
//! returns true if the file maybe is able to be loaded by this class
|
|
bool CImageLoaderDDS::isALoadableFileFormat(io::IReadFile* file) const
|
|
{
|
|
if (!file)
|
|
return false;
|
|
|
|
ddsBuffer header;
|
|
file->read(&header, sizeof(header));
|
|
|
|
s32 width, height;
|
|
eDDSPixelFormat pixelFormat;
|
|
|
|
return (0 == DDSGetInfo( &header, &width, &height, &pixelFormat));
|
|
}
|
|
|
|
|
|
//! creates a surface from the file
|
|
IImage* CImageLoaderDDS::loadImage(io::IReadFile* file) const
|
|
{
|
|
u8 *memFile = new u8 [ file->getSize() ];
|
|
file->read ( memFile, file->getSize() );
|
|
|
|
ddsBuffer *header = (ddsBuffer*) memFile;
|
|
IImage* image = 0;
|
|
s32 width, height;
|
|
eDDSPixelFormat pixelFormat;
|
|
|
|
if ( 0 == DDSGetInfo( header, &width, &height, &pixelFormat) )
|
|
{
|
|
image = new CImage(ECF_A8R8G8B8, core::dimension2d<u32>(width, height));
|
|
|
|
if ( DDSDecompress( header, (u8*) image->lock() ) == -1)
|
|
{
|
|
image->unlock();
|
|
image->drop();
|
|
image = 0;
|
|
}
|
|
}
|
|
|
|
delete [] memFile;
|
|
if ( image )
|
|
image->unlock();
|
|
|
|
return image;
|
|
}
|
|
|
|
|
|
//! creates a loader which is able to load dds images
|
|
IImageLoader* createImageLoaderDDS()
|
|
{
|
|
return new CImageLoaderDDS();
|
|
}
|
|
|
|
|
|
} // end namespace video
|
|
} // end namespace irr
|
|
|
|
#endif
|