xash3d-fwgs/ref_vk/shaders/peters2021-sampling
Ivan Avdeev 74e9401e56 rtx: start experimenting with peters2021 poly sampling
Add bits of shader code from https://github.com/MomentsInGraphics/vulkan_renderer/blob/main/src/shaders/

More info and the paper itself is here: https://momentsingraphics.de/Siggraph2021.html
```
	BRDF Importance Sampling for Polygonal Lights
	Christoph Peters.
	2021–07 in ACM Transactions on Graphics (Proc. SIGGRAPH) 40, 4.
```
2021-12-28 19:41:19 -08:00
..
math_constants.glsl rtx: start experimenting with peters2021 poly sampling 2021-12-28 19:41:19 -08:00
polygon_clipping.glsl rtx: start experimenting with peters2021 poly sampling 2021-12-28 19:41:19 -08:00
polygon_sampling.glsl rtx: start experimenting with peters2021 poly sampling 2021-12-28 19:41:19 -08:00