View Single Post
Old 05-15-10, 01:19 AM   #71
Registered User
Join Date: Mar 2006
Posts: 532
Default Re: New screen shots of ID's Rage

Originally Posted by AngelGraves13 View Post
It's probably texture compression that we're seeing in those shots. I'm sure even a GTX 480 will have trouble running the uncompressed ULTRA quality mode of this game.
Indeed, normal PC could have problems with disk trashing.

We do know there is at least 2 128kx128k megatextures in the game.
When uncompressed textures would hold something like with 4bytes for RGB + specular strenght then 2 or 3 bytes for normalmapping and 1 or 2 bytes for something else.
That is 2*RGBA textures or 8bytes per texel.

Single 128k texture uncompressed with 8 bytes/texel is ((128000*128000)*8)/1000000000~131,072GB.
With DXT1 compression the size would be around 30-40GB depending on what channels they use and for what. (and thus what DXT method is used.)
Id Tech uses something similar to JPEG but most likely in YCoCg color space.

We might get some kind of 'less' compressed version which takes huge amounts af disk space, but uncompressed no way.
Also on PC it might be possible to not re-compress the data to DXT before viewing so there might be one of the quality improvements over console versions.
jlippo is offline   Reply With Quote