rtx: bring back front face culling; update todo

ref_vk/TODO.md

@@ -1,18 +1,11 @@
-## 2021-10-24 E155
-- [ ] rtx: static lights
-	- [x] point lights
-	- [x] surface lights
-	- [ ] remove surface visibility cache
+# Next
+- [ ] remove surface visibility cache
 - [ ] rtx: remove lbsp
 - [ ] rtx: rename point lights to lampochki
 - [ ] rtx: move entity parsing to its own module
-
-# Next
 - [ ] rtx: rename emissive surface to surface lights
 - [ ] rtx: configuration that includes texture name -> pbr params mapping, etc. Global, per-map, ...
-- [ ] rtx: better light culling: normal, bsp visibility, light volumes and intensity, sort by intensity, etc
 - [ ] rtx: simple convolution denoise (bilateral?)
-- [ ] rtx: cluster dlights
 - [ ] rtx: dynamically sized light clusters
 	Split into 2 buffers:
 		struct LightCluster { uint16 offset, length; }
@@ -80,7 +73,6 @@
 - [ ] rtx: add fps: rasterize into G-buffer, and only then compute lighting with rtx
 - [ ] rtx: bake light visibility in compute shader
 - [ ] rtx: cull light sources (dlights and light textures) using bsp
-- [ ] enable entity-parsed lights by lightstyles
 - [ ] dlight for flashlight seems to be broken
 - [ ] make 2nd commad buffer for resource upload
 - [ ] fix sprite blending; there are commented out functions that we really need (see tunnel before the helicopter in the very beginning)
@@ -384,3 +376,14 @@
 	- [x] bsp:
 		- [x] leaf culling
 		- [x] pvs
+
+- [x] rtx: better light culling: normal, bsp visibility, (~light volumes and intensity, sort by intensity, etc~)
+- [x] rtx: cluster dlights
+
+## 2021-10-24 E155
+- [x] rtx: static lights
+	- [x] point lights
+	- [x] surface lights
+
+## 2021-10-26 E156
+- [x] enable entity-parsed lights by lightstyles

ref_vk/shaders/ray.rgen

@@ -290,7 +290,7 @@ void main() {
 		// TODO early exit based on throughput being too small
 
 		const uint flags = 0
-			//| gl_RayFlagsCullFrontFacingTrianglesEXT
+			| gl_RayFlagsCullFrontFacingTrianglesEXT
 			//| gl_RayFlagsOpaqueEXT
 			;
 		const uint sbt_offset = 0;