[Metahook] Load DTX Texture to OpenGL

This function is load a Lithtech *.dtx texture file and convert to OpenGL pixel format, compressed support.

Use FileSystem interface. :D

1 #pragmaPack (1)2 3 structDtxheader4 {5UnsignedintIrestype;6     intiversion;7Unsigned ShortUswidth;8Unsigned ShortUsheight;9Unsigned ShortUsmipmaps;TenUnsigned Shortussections; One     intiflags; A     intiuserflags; -UnsignedCharubextra[ A]; -     Charszcommandstring[ -]; the }; -  - #pragmaPack ()

1 BOOLLOADDTX (Const Char*pszfilename, unsignedChar*pbuffer,intIbuffersize,int*pinternalformat,int*pwidth,int*pheight,int*pimagesize)2 {3filehandle_t pFile = G_pfilesystem->open (pszFileName,"RB");4 5     if(!pFile)6         return false;7 8 Dtxheader Header;9memset (&header,0,sizeof(Header));Ten  OneG_pfilesystem->read (&header,sizeof(Header), pFile); A  -     if(Header.irestype! =0|| Header.iversion! =-5|| Header.usmipmaps = =0) -     { theG_pfilesystem->Close (pFile); -         return false; -     } -  +*pwidth =Header.uswidth; -*pheight =Header.usheight; +  A     intIBPP = header.ubextra[2]; at     intisize; -      -     if(IBPP = =0|| IBPP = =3) -     { -Isize = header.uswidth * Header.usheight *4; -*pinternalformat =Gl_rgba; in     } -     Else if(IBPP = =4) to     { +Isize = (Header.uswidth * header.usheight) >>1; -*pinternalformat =Gl_compressed_rgba_s3tc_dxt1_ext; the     } *     Else if(IBPP = =5) $     {Panax NotoginsengIsize = Header.uswidth *Header.usheight; -*pinternalformat =Gl_compressed_rgba_s3tc_dxt3_ext; the     } +     Else if(IBPP = =6) A     { theIsize = Header.uswidth *Header.usheight; +*pinternalformat =Gl_compressed_rgba_s3tc_dxt5_ext; -     } $     Else $     { -Isize =0; -     } the  -*pimagesize =isize;Wuyi  the     if(Isize = =0|| Isize >ibuffersize) -     { WuG_pfilesystem->Close (pFile); -         return false; About     } $  -G_pfilesystem->Read (pbuffer, Isize, pFile); -  -     if(IBPP = =3) A     { +          for(unsignedinti =0; i < isize; i + =4) the         { -Pbuffer[i +0] ^= Pbuffer[i +2]; $Pbuffer[i +2] ^= Pbuffer[i +0]; thePbuffer[i +0] ^= Pbuffer[i +2]; the         } the     } the  -G_pfilesystem->Close (pFile); in     return true; the}

[Metahook] Load DTX Texture to OpenGL