I performed some tests in which I implemented some shadow filtering techniques: PCF and VSM.
I'm really puzzled because I am getting 700 fps with a 3x3 kernel, 525 fps with a 9x9 kernel filter and 439 fps with a 15x15 kernel filter!
The screen resolution is full-HD and the shadow map size is 1024x1024. I used an Itel i7 @2,8 Ghz and an nvidia geForce GTX480.
Using VSM I only get a small performaqnce boost: 666 fps instead of 439.
Does this mean that, as the power of the GPUs increases, techniques like VSM will be useless because PCF will not be the bottleneck anymore?
What do you think?