Xash3D FWGS engine.
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/*
img_ktx2.c - ktx2 format load
Copyright (C) 2023 Provod
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_ktx2.h"
static void Image_KTX2Format( uint32_t ktx2_format )
{
switch( ktx2_format )
{
case KTX2_FORMAT_BC4_UNORM_BLOCK:
image.type = PF_BC4_UNSIGNED;
// 1 component for ref_gl
break;
case KTX2_FORMAT_BC4_SNORM_BLOCK:
image.type = PF_BC4_SIGNED;
// 1 component for ref_gl
break;
case KTX2_FORMAT_BC5_UNORM_BLOCK:
image.type = PF_BC5_UNSIGNED;
// 2 components for ref_gl
SetBits( image.flags, IMAGE_HAS_ALPHA );
break;
case KTX2_FORMAT_BC5_SNORM_BLOCK:
image.type = PF_BC5_SIGNED;
// 2 components for ref_gl
SetBits( image.flags, IMAGE_HAS_ALPHA );
break;
case KTX2_FORMAT_BC6H_UFLOAT_BLOCK:
image.type = PF_BC6H_UNSIGNED;
// 3 components for ref_gl
SetBits( image.flags, IMAGE_HAS_COLOR );
break;
case KTX2_FORMAT_BC6H_SFLOAT_BLOCK:
image.type = PF_BC6H_SIGNED;
// 3 components for ref_gl
SetBits( image.flags, IMAGE_HAS_COLOR );
break;
case KTX2_FORMAT_BC7_UNORM_BLOCK:
image.type = PF_BC7_UNORM;
// 4 components for ref_gl
SetBits( image.flags, IMAGE_HAS_COLOR | IMAGE_HAS_ALPHA );
break;
case KTX2_FORMAT_BC7_SRGB_BLOCK:
image.type = PF_BC7_SRGB;
// 4 components for ref_gl
SetBits( image.flags, IMAGE_HAS_COLOR | IMAGE_HAS_ALPHA );
break;
default:
image.type = PF_UNKNOWN;
break;
}
}
static qboolean Image_KTX2Parse( const ktx2_header_t *header, const byte *buffer, fs_offset_t filesize )
{
ktx2_index_t index;
size_t total_size = 0;
size_t max_offset = 0;
int mip, cursor;
const byte *const levels_begin = buffer + KTX2_LEVELS_OFFSET;
// Sets image.type and image.flags
Image_KTX2Format( header->vkFormat );
if( image.type == PF_UNKNOWN )
{
Con_DPrintf( S_ERROR "%s: unsupported KTX2 format %d\n", __FUNCTION__, header->vkFormat );
return false;
}
if( !Image_CheckFlag( IL_DDS_HARDWARE ) && ImageCompressed( image.type ))
{
Con_DPrintf( S_WARN "%s: has compressed format, but support is not advertized\n", __FUNCTION__ );
return false;
}
if( header->levelCount == 0 )
{
Con_DPrintf( S_ERROR "%s: file has no mip levels\n", __FUNCTION__ );
return false;
}
if( header->pixelDepth > 1 )
{
Con_DPrintf( S_ERROR "%s: unsupported KTX2 pixelDepth %d\n", __FUNCTION__, header->pixelDepth );
return false;
}
if( header->faceCount > 1 )
{
Con_DPrintf( S_ERROR "%s: unsupported KTX2 faceCount %d\n", __FUNCTION__, header->faceCount );
return false;
}
if( header->layerCount > 1 )
{
Con_DPrintf( S_ERROR "%s: unsupported KTX2 layerCount %d\n", __FUNCTION__, header->layerCount );
return false;
}
if( header->supercompressionScheme != 0 )
{
Con_DPrintf( S_ERROR "%s: unsupported KTX2 supercompressionScheme %d\n", __FUNCTION__, header->supercompressionScheme );
return false;
}
if( header->levelCount * sizeof( ktx2_level_t ) + KTX2_LEVELS_OFFSET > filesize )
{
Con_DPrintf( S_ERROR "%s: file abruptly ends\n", __FUNCTION__ );
return false;
}
memcpy( &index, buffer + KTX2_IDENTIFIER_SIZE + sizeof( ktx2_header_t ), sizeof( index ));
for( mip = 0; mip < header->levelCount; ++mip )
{
const uint32_t width = Q_max( 1, ( header->pixelWidth >> mip ));
const uint32_t height = Q_max( 1, ( header->pixelHeight >> mip ));
const uint32_t mip_size = Image_ComputeSize( image.type, width, height, image.depth );
ktx2_level_t level;
memcpy( &level, levels_begin + mip * sizeof( level ), sizeof( level ));
if( mip_size != level.byteLength )
{
Con_DPrintf( S_ERROR "%s: mip=%d size mismatch read=%d, but computed=%d\n",
__FUNCTION__, mip, (int)level.byteLength, mip_size );
return false;
}
total_size += level.byteLength;
max_offset = Q_max( max_offset, level.byteLength + level.byteOffset );
}
if( max_offset > filesize )
return false;
image.size = total_size;
image.num_mips = header->levelCount;
image.rgba = Mem_Malloc( host.imagepool, image.size );
memcpy( image.rgba, buffer, image.size );
for( mip = 0, cursor = 0; mip < header->levelCount; ++mip )
{
ktx2_level_t level;
memcpy( &level, levels_begin + mip * sizeof( level ), sizeof( level ));
memcpy( image.rgba + cursor, buffer + level.byteOffset, level.byteLength );
cursor += level.byteLength;
}
return true;
}
qboolean Image_LoadKTX2( const char *name, const byte *buffer, fs_offset_t filesize )
{
ktx2_header_t header;
if( filesize < KTX2_MINIMAL_HEADER_SIZE )
return false;
if( memcmp( buffer, KTX2_IDENTIFIER, KTX2_IDENTIFIER_SIZE ) != 0 )
{
Con_DPrintf( S_ERROR "%s: (%s) has invalid identifier\n", __FUNCTION__, name );
return false;
}
memcpy( &header, buffer + KTX2_IDENTIFIER_SIZE, sizeof( header ));
image.width = header.pixelWidth;
image.height = header.pixelHeight;
image.depth = Q_max( 1, header.pixelDepth );
image.num_mips = 1;
ClearBits( image.flags, IMAGE_HAS_COLOR | IMAGE_HAS_ALPHA | IMAGE_HAS_LUMA );
if( !Image_KTX2Parse( &header, buffer, filesize ))
{
if( !Image_CheckFlag( IL_KTX2_RAW ))
return false;
// If KTX2 to imagelib conversion failed, try passing the file as raw data.
// This is useful for ref_vk which can directly support hundreds of formats which we don't convert to pixformat_t here
Con_DPrintf( S_WARN "%s: (%s) could not be converted to supported imagelib format, passing as raw KTX2 data\n", __FUNCTION__, name );
// This is a catch-all for ref_vk, which can do this format directly and natively
image.type = PF_KTX2_RAW;
image.size = filesize;
//image.encode = TODO custom encode type?
image.rgba = Mem_Malloc( host.imagepool, image.size );
memcpy( image.rgba, buffer, image.size );
}
return true;
}