Work-around for Torchlight crashing with an Ogre exception on Linux

This will hopefully be useful to some of those who have purchased the Linux version of the Torchlight game as part of the 6th Humble Indie Bundle.

While crawling some late dungeon levels, the game crashed with the following error message on the command line:

*-*-* OGRE Initialising
*-*-* Version 1.6.5 (Shoggoth)
terminate called after throwing an instance of 'Ogre::RenderingAPIException'
  what():  OGRE EXCEPTION(3:RenderingAPIException): Zero sized texture surface on texture MEDIA/PARTICLES/TEXTURES/TRAIL/TRAIL37.DDS face 0 mipmap 2. Probably,
the GL driver refused to create the texture. in GLTexture::_createSurfaceList at ../../../../RenderSystems/GL/src/OgreGLTexture.cpp (line 405)
Error: signal: 6

./Torchlight.bin.x86_64(_ZN10LinuxUtils13crash_handlerEi+0x25)[0x17eb6f5]
/lib/x86_64-linux-gnu/libc.so.6(+0x364a0)[0x7f3b1e20b4a0]
/lib/x86_64-linux-gnu/libc.so.6(gsignal+0x35)[0x7f3b1e20b425]
/lib/x86_64-linux-gnu/libc.so.6(abort+0x17b)[0x7f3b1e20eb8b]
/usr/lib/x86_64-linux-gnu/libstdc++.so.6(_ZN9__gnu_cxx27__verbose_terminate_handlerEv+0x11d)[0x7f3b1eb5d69d]
/usr/lib/x86_64-linux-gnu/libstdc++.so.6(+0xb5846)[0x7f3b1eb5b846]
/usr/lib/x86_64-linux-gnu/libstdc++.so.6(+0xb5873)[0x7f3b1eb5b873]
/usr/lib/x86_64-linux-gnu/libstdc++.so.6(__cxa_rethrow+0x46)[0x7f3b1eb5b9b6]
/opt/torchlight/lib64/libOgreMain-1.6.5.so(_ZN4Ogre8Resource4loadEb+0x38d)[0x7f3b218a6dad]
/opt/torchlight/lib64/libOgreMain-1.6.5.so(_ZN4Ogre15ResourceManager4loadERKSsS2_bPNS_20ManualResourceLoaderEPKSt3mapISsSsSt4lessISsESaISt4pairIS1_SsEEE+0x91)[0x7f3b218b5381]
./Torchlight.bin.x86_64(_ZN16ParticleUniverse17ParticleTechnique15setMaterialNameERKSs+0xc2)[0x176d936]
./Torchlight.bin.x86_64(_ZN20CParticleTechWrapper21createTextureMaterialEv+0x903)[0xfbbc1f]
./Torchlight.bin.x86_64(_ZN30CParticleTechWrapperDescriptor29DescriptorObjectHasBeenInitedEP17CEditorBaseObject+0x1c)[0xa2b090]
./Torchlight.bin.x86_64(_ZN12CEditorScene20loadCompressedLayoutER9CFileInfoP10TArrayListIP17CEditorBaseObjectEx+0x963)[0xab4919]
./Torchlight.bin.x86_64(_ZN12CEditorScene9loadSceneESbIwSt11char_traitsIwESaIwEEbP10TArrayListIP17CEditorBaseObjectExbP13CTimerStatics+0x2ac)[0xab0bfa]
./Torchlight.bin.x86_64(_ZN7CLayout14loadLayoutFileERKSbIwSt11char_traitsIwESaIwEEbP13CTimerStaticsbbj+0x6c6)[0xf02ad8]
./Torchlight.bin.x86_64(_ZN18CParticlePreloader12LoadParticleESbIwSt11char_traitsIwESaIwEES3_+0x25b)[0xfaf349]
./Torchlight.bin.x86_64(_ZN18CParticlePreloader12LoadParticleESbIwSt11char_traitsIwESaIwEE+0xdd)[0xfaed1b]
./Torchlight.bin.x86_64[0xf02041]
./Torchlight.bin.x86_64(_ZN7CLayout14loadLayoutFileERKSbIwSt11char_traitsIwESaIwEEbP13CTimerStaticsbbj+0x265)[0xf02677]
./Torchlight.bin.x86_64(_ZN17CLayoutDescriptor18Set_loadLayoutFileEP17CEditorBaseObjectP14UNIONDATA16BITj+0x7c)[0x855992]
./Torchlight.bin.x86_64(_ZN15CDescriptorProp15setDataOnObjectEP17CEditorBaseObjectPK14UNIONDATA32BITj+0x17a)[0xa55fe0]
./Torchlight.bin.x86_64(_ZN15CDescriptorProp7setDataEPK14UNIONDATA32BITjP17CEditorBaseObject+0x59)[0xa55d09]
./Torchlight.bin.x86_64(_ZN11CDescriptor24loadObjectFromBinaryFileER11COgreReaderP17CEditorBaseObjectR28CDescriptorLoadConfiguration+0x36f)[0xa42107]
./Torchlight.bin.x86_64(_Z26loadObjectByCompressedFileP12CEditorSceneR28CDescriptorLoadConfigurationR11COgreReaderP17CEditorBaseObjectb+0x122)[0xab39f2]
./Torchlight.bin.x86_64(_ZN12CEditorScene20loadCompressedLayoutER9CFileInfoP10TArrayListIP17CEditorBaseObjectEx+0x3b3)[0xab4369]
./Torchlight.bin.x86_64(_ZN12CEditorScene9loadSceneESbIwSt11char_traitsIwESaIwEEbP10TArrayListIP17CEditorBaseObjectExbP13CTimerStatics+0x2ac)[0xab0bfa]
./Torchlight.bin.x86_64(_ZN7CLayout14loadLayoutFileERKSbIwSt11char_traitsIwESaIwEEbP13CTimerStaticsbbj+0x6c6)[0xf02ad8]
./Torchlight.bin.x86_64(_ZN11CSkillEventC2EP6CSkillP14CSkillPropertyP16CResourceManagerP10CDataGroup+0x19a3)[0x1344eeb]
./Torchlight.bin.x86_64(_ZN14CSkillPropertyC1EP6CSkillP16CResourceManagerPS_P10CDataGroupj+0x34ff)[0x1386e4f]
./Torchlight.bin.x86_64(_ZN6CSkillC2EP16CResourceManagerP10CDataGroup+0x5e9)[0x1319c2d]
./Torchlight.bin.x86_64(_ZN12CSkillParser8getSkillEP16CResourceManagerRKSbIwSt11char_traitsIwESaIwEE+0xf3)[0x1375f9d]
./Torchlight.bin.x86_64(_ZN13CSkillManager8addSkillERKSbIwSt11char_traitsIwESaIwEEb+0xe6)[0x1363f7e]
./Torchlight.bin.x86_64(_ZN9CBaseUnit14addSkillByNameERKSbIwSt11char_traitsIwESaIwEEb+0x9c)[0xbf53c4]
./Torchlight.bin.x86_64(_ZN9CBaseUnit8unitInitEP10CDataGroupb+0x13fc)[0xbf756c]
./Torchlight.bin.x86_64(_ZN10CCharacter8unitInitEP10CDataGroupb+0x63)[0xc29de5]
./Torchlight.bin.x86_64(_ZN8CMonster8unitInitEP10CDataGroupb+0x2f)[0xd4ae41]
./Torchlight.bin.x86_64(_ZN10CCharacter16convertCharacterESbIwSt11char_traitsIwESaIwEEb+0x873)[0xc29241]
./Torchlight.bin.x86_64(_ZN10CCharacter18createNewCharacterESbIwSt11char_traitsIwESaIwEE+0x1cf)[0xc2897d]
./Torchlight.bin.x86_64(_ZN18CMonsterDescriptor22Set_createNewCharacterEP17CEditorBaseObjectP14UNIONDATA16BITj+0x5f)[0x8955ed]

At the time, a patch for this wasn't available, so I had to work around that bug in the following way:

find pak.zip inside the game directory (/opt/torchlight/pak.zip on my machine)
unpack this file using unzip (or my favourite: aunpack)
find the offending texture (media/particles/textures/trail/trail37.dds as per the error message above)
copy a similar one (I picked trail36.dds in the same directory) on top of it
zip up the modified directory and replace the original pak.zip with this one

In theory, this hack could cause some visual glitches, but I didn't actually notice anything and was quite happy to be able to rescue my game.

(I ran into this bug on an Ubuntu 12.04 Precise laptop using an Intel GPU.)