Day 29: Big Optimization

Today i managed to reduce the amount of texture data used in the deferred shading.

I reduce the color to 24 bits (instead of 4 floats) and the normals to 3 16-bit values.

The performance is way better, but i will have to make another two big optimizations:

1) Remove completly the position buffer, and built it back from the depth buffer

2) Pass only two axis of the normals, and build the third back

I know i can do these things, but i have not studied exactly how to do it.

In the next days i will have very little time, then i'll go back and do all these stuff