deferred: 

ar ag ab gl - accumulation RGB + glow

nx ny mx my? - normal, motion
dr dg db sm - diffuse, shademodel
sr sg sb sp - specular OR shadeparams

ar ag ab gl
nx ny sp sp
dr dg db se
444 6 
se can be 6 bits, 2 for shade model

shade models:

0 - none
1 - wrap
2 - toon
3 - fresne



sp: 2 bits what - 6 bits param

16







