Fix MRT descriptors to handle texture formats
Fix MRT descriptors to handle texture formats

sebavan/Babylon.js,NicolasBuecher/Babylon.js,Kesshi/Babylon.js,NicolasBuecher/Babylon.js,RaananW/Babylon.js,RaananW/Babylon.js,Kesshi/Babylon.js,BabylonJS/Babylon.js,RaananW/Babylon.js,BabylonJS/Babylon.js,sebavan/Babylon.js,Kesshi/Babylon.js,NicolasBuecher/Babylon.js,BabylonJS/Babylon.js,sebavan/Babylon.js