shadow2DProj question

Graphics and GPU Programming Programming

Started by CDProp October 25, 2013 12:30 AM

2 comments, last by CDProp 10 years, 5 months ago

1,451

Author

October 25, 2013 12:30 AM

Greetings,

I have some older shaders running on GLSL 1.2 in which I'm using the shadow2DProj function (which I understand is now deprecated). Is there a way to control how many samples it uses for its filtering, and how spread apart those samples are? Right now, the shadow that I'm seeing is slightly blurred on the edges, but the jaggies are still extremely obvious. Way more than what I'm used to.

3TATUK2

715

October 25, 2013 01:42 AM

maybe your shadowmap resolution is too small?

MJP

20,295

October 25, 2013 07:56 AM

GPU's only support 2x2 bilinear PCF filtering. If you need a larger kernel, you'll have to implement it yourself by taking multiple samples. If hardware PCF is available it's possible to use multiple 2x2 samples to implement a wider filter kernel. The "OptimizedPCF" mode from my shadows sample does this, so you could use it as a reference if you go down that route.

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