Xash3D FWGS engine.
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/*
img_dds.c - dds format load
Copyright (C) 2015 Uncle Mike
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
*/
#include "imagelib.h"
#include "xash3d_mathlib.h"
#include "img_dds.h"
static qboolean Image_CheckDXT3Alpha( dds_t *hdr, byte *fin )
{
word sAlpha;
byte *alpha;
int x, y, i, j;
for( y = 0; y < hdr->dwHeight; y += 4 )
{
for( x = 0; x < hdr->dwWidth; x += 4 )
{
alpha = fin + 8;
fin += 16;
for( j = 0; j < 4; j++ )
{
sAlpha = alpha[2*j] + 256 * alpha[2*j+1];
for( i = 0; i < 4; i++ )
{
if((( x + i ) < hdr->dwWidth ) && (( y + j ) < hdr->dwHeight ))
{
if( sAlpha == 0 )
return true;
}
sAlpha >>= 4;
}
}
}
}
return false;
}
static qboolean Image_CheckDXT5Alpha( dds_t *hdr, byte *fin )
{
uint bits, bitmask;
byte *alphamask;
int x, y, i, j;
for( y = 0; y < hdr->dwHeight; y += 4 )
{
for( x = 0; x < hdr->dwWidth; x += 4 )
{
if( y >= hdr->dwHeight || x >= hdr->dwWidth )
break;
alphamask = fin + 2;
fin += 8;
bitmask = ((uint *)fin)[1];
fin += 8;
// last three bytes
bits = (alphamask[3]) | (alphamask[4] << 8) | (alphamask[5] << 16);
for( j = 2; j < 4; j++ )
{
for( i = 0; i < 4; i++ )
{
// only put pixels out < width or height
if((( x + i ) < hdr->dwWidth ) && (( y + j ) < hdr->dwHeight ))
{
if( bits & 0x07 )
return true;
}
bits >>= 3;
}
}
}
}
return false;
}
static void Image_DXTGetPixelFormat( dds_t *hdr, dds_header_dxt10_t *headerExt )
{
uint bits = hdr->dsPixelFormat.dwRGBBitCount;
if( !FBitSet( hdr->dsCaps.dwCaps2, DDS_VOLUME ))
hdr->dwDepth = 1;
if( FBitSet( hdr->dsPixelFormat.dwFlags, DDS_FOURCC ))
{
if( hdr->dsPixelFormat.dwFourCC == TYPE_DX10 )
{
switch( headerExt->dxgiFormat )
{
case DXGI_FORMAT_BC4_TYPELESS:
case DXGI_FORMAT_BC4_UNORM:
image.type = PF_BC4_UNSIGNED;
break;
case DXGI_FORMAT_BC4_SNORM:
image.type = PF_BC4_SIGNED;
break;
case DXGI_FORMAT_BC6H_SF16:
image.type = PF_BC6H_SIGNED;
break;
case DXGI_FORMAT_BC6H_UF16:
case DXGI_FORMAT_BC6H_TYPELESS:
image.type = PF_BC6H_UNSIGNED;
break;
case DXGI_FORMAT_BC7_UNORM:
case DXGI_FORMAT_BC7_TYPELESS:
image.type = PF_BC7_UNORM;
break;
case DXGI_FORMAT_BC7_UNORM_SRGB:
image.type = PF_BC7_SRGB;
break;
case DXGI_FORMAT_BC5_TYPELESS:
image.type = PF_ATI2;
break;
case DXGI_FORMAT_BC5_UNORM:
image.type = PF_BC5_UNSIGNED;
break;
case DXGI_FORMAT_BC5_SNORM:
image.type = PF_BC5_SIGNED;
break;
default:
image.type = PF_UNKNOWN;
break;
}
}
else
{
switch( hdr->dsPixelFormat.dwFourCC )
{
case TYPE_DXT1:
image.type = PF_DXT1;
break;
case TYPE_DXT2:
image.flags &= ~IMAGE_HAS_ALPHA; // alpha is already premultiplied by color
// intentionally fallthrough
case TYPE_DXT3:
image.type = PF_DXT3;
break;
case TYPE_DXT4:
image.flags &= ~IMAGE_HAS_ALPHA; // alpha is already premultiplied by color
// intentionally fallthrough
case TYPE_DXT5:
image.type = PF_DXT5;
break;
case TYPE_ATI2:
image.type = PF_ATI2;
break;
case TYPE_BC5S:
image.type = PF_BC5_SIGNED;
break;
case TYPE_BC4S:
image.type = PF_BC4_SIGNED;
break;
case TYPE_BC4U:
image.type = PF_BC4_UNSIGNED;
break;
default:
image.type = PF_UNKNOWN; // assume error
break;
}
}
}
else
{
// this dds texture isn't compressed so write out ARGB or luminance format
if( hdr->dsPixelFormat.dwFlags & DDS_DUDV )
{
image.type = PF_UNKNOWN; // assume error
}
else if( hdr->dsPixelFormat.dwFlags & DDS_LUMINANCE )
{
image.type = PF_UNKNOWN; // assume error
}
else
{
switch( bits )
{
case 32:
image.type = PF_BGRA_32;
break;
case 24:
image.type = PF_BGR_24;
break;
case 8:
image.type = PF_LUMINANCE;
break;
default:
image.type = PF_UNKNOWN;
break;
}
}
}
// setup additional flags
if( hdr->dsCaps.dwCaps1 & DDS_COMPLEX && hdr->dsCaps.dwCaps2 & DDS_CUBEMAP )
image.flags |= IMAGE_CUBEMAP;
if( hdr->dwFlags & DDS_MIPMAPCOUNT )
image.num_mips = hdr->dwMipMapCount; // get actual mip count
}
static size_t Image_DXTCalcMipmapSize( dds_t *hdr )
{
size_t buffsize = 0;
int i, width, height;
// now correct buffer size
for( i = 0; i < Q_max( 1, ( hdr->dwMipMapCount )); i++ )
{
width = Q_max( 1, ( hdr->dwWidth >> i ));
height = Q_max( 1, ( hdr->dwHeight >> i ));
buffsize += Image_ComputeSize( image.type, width, height, image.depth );
}
return buffsize;
}
static uint Image_DXTCalcSize( const char *name, dds_t *hdr, size_t filesize )
{
size_t buffsize = 0;
int w = image.width;
int h = image.height;
int d = image.depth;
if( hdr->dsCaps.dwCaps2 & DDS_CUBEMAP )
{
// cubemap w*h always match for all sides
buffsize = Image_DXTCalcMipmapSize( hdr ) * 6;
}
else if( hdr->dwFlags & DDS_MIPMAPCOUNT )
{
// if mipcount > 1
buffsize = Image_DXTCalcMipmapSize( hdr );
}
else if( hdr->dwFlags & ( DDS_LINEARSIZE|DDS_PITCH ))
{
// just in case (no need, really)
buffsize = hdr->dwLinearSize;
}
else
{
// pretty solution for microsoft bug
buffsize = Image_DXTCalcMipmapSize( hdr );
}
if( filesize != buffsize ) // main check
{
Con_DPrintf( S_WARN "Image_LoadDDS: (%s) probably corrupted (%zu should be %lu)\n", name, buffsize, filesize );
if( buffsize > filesize )
return false;
}
return buffsize;
}
static void Image_DXTAdjustVolume( dds_t *hdr )
{
if( hdr->dwDepth <= 1 )
return;
hdr->dwLinearSize = Image_ComputeSize( image.type, hdr->dwWidth, hdr->dwHeight, hdr->dwDepth );
hdr->dwFlags |= DDS_LINEARSIZE;
}
/*
=============
Image_LoadDDS
=============
*/
qboolean Image_LoadDDS( const char *name, const byte *buffer, fs_offset_t filesize )
{
dds_t header;
byte *fin;
int headersOffset;
dds_header_dxt10_t header2;
if( filesize < sizeof( header ))
return false;
memcpy( &header, buffer, sizeof( header ));
if( header.dwIdent != DDSHEADER )
return false; // it's not a dds file, just skip it
if( header.dwSize != sizeof( header ) - sizeof( uint )) // size of the structure (minus MagicNum)
{
Con_DPrintf( S_ERROR "Image_LoadDDS: (%s) have corrupted header\n", name );
return false;
}
if( header.dsPixelFormat.dwSize != sizeof( dds_pixf_t )) // size of the structure
{
Con_DPrintf( S_ERROR "Image_LoadDDS: (%s) have corrupt pixelformat header\n", name );
return false;
}
headersOffset = sizeof( header );
if( header.dsPixelFormat.dwFourCC == TYPE_DX10 )
{
memcpy( &header2, buffer + sizeof( header ), sizeof( header2 ));
headersOffset += sizeof( header2 );
}
image.width = header.dwWidth;
image.height = header.dwHeight;
if( header.dwFlags & DDS_DEPTH )
image.depth = header.dwDepth;
else image.depth = 1;
if( !Image_ValidSize( name )) return false;
Image_DXTGetPixelFormat( &header, &header2 ); // and image type too :)
Image_DXTAdjustVolume( &header );
if( !Image_CheckFlag( IL_DDS_HARDWARE ) && ImageCompressed( image.type ))
return false; // silently rejected
if( image.type == PF_UNKNOWN )
{
Con_DPrintf( S_ERROR "Image_LoadDDS: (%s) has unrecognized type\n", name );
return false;
}
image.size = Image_DXTCalcSize( name, &header, filesize - headersOffset );
if( image.size == 0 ) return false; // just in case
fin = (byte *)( buffer + headersOffset );
// copy an encode method
image.encode = (word)header.dwReserved1[0];
switch( image.encode )
{
case DXT_ENCODE_COLOR_YCoCg:
SetBits( image.flags, IMAGE_HAS_COLOR );
break;
case DXT_ENCODE_NORMAL_AG_ORTHO:
case DXT_ENCODE_NORMAL_AG_STEREO:
case DXT_ENCODE_NORMAL_AG_PARABOLOID:
case DXT_ENCODE_NORMAL_AG_QUARTIC:
case DXT_ENCODE_NORMAL_AG_AZIMUTHAL:
SetBits( image.flags, IMAGE_HAS_COLOR );
break;
default: // check for real alpha-pixels
if( image.type == PF_DXT3 && Image_CheckDXT3Alpha( &header, fin ))
SetBits( image.flags, IMAGE_HAS_ALPHA );
else if( image.type == PF_DXT5 && Image_CheckDXT5Alpha( &header, fin ))
SetBits( image.flags, IMAGE_HAS_ALPHA );
else if( image.type == PF_BC5_SIGNED || image.type == PF_BC5_UNSIGNED )
SetBits( image.flags, IMAGE_HAS_ALPHA );
else if( image.type == PF_BC7_UNORM || image.type == PF_BC7_SRGB )
SetBits( image.flags, IMAGE_HAS_ALPHA );
if( !FBitSet( header.dsPixelFormat.dwFlags, DDS_LUMINANCE ))
SetBits( image.flags, IMAGE_HAS_COLOR );
break;
}
if( image.type == PF_LUMINANCE )
ClearBits( image.flags, IMAGE_HAS_COLOR|IMAGE_HAS_ALPHA );
if( header.dwReserved1[1] != 0 )
{
// store texture reflectivity
image.fogParams[0] = ((header.dwReserved1[1] & 0x000000FF) >> 0 );
image.fogParams[1] = ((header.dwReserved1[1] & 0x0000FF00) >> 8 );
image.fogParams[2] = ((header.dwReserved1[1] & 0x00FF0000) >> 16);
image.fogParams[3] = ((header.dwReserved1[1] & 0xFF000000) >> 24);
}
// dds files will be uncompressed on a render. requires minimal of info for set this
image.rgba = Mem_Malloc( host.imagepool, image.size );
memcpy( image.rgba, fin, image.size );
SetBits( image.flags, IMAGE_DDS_FORMAT );
return true;
}