Custom PPSSPP shaders

[Henrik]

Yeah, you need the latest build from the buildbot or wait for 0.9.6.

Anyway, here are the four times:

u_time.x: Current time in seconds, not connected to emulator frame rate (so will not react to "unthrottle" (holding tab))
u_time.y: 0.0-1.0 increasing, wrapping every game time second
u_time.z: Current time as a count of 60ths of a game time second
u_time.w: Same as z but wrapping (game time)