Update todo

todo.md

@@ -1,30 +1,21 @@
-* util
-	* span: fix constness + create from vector
 * geom
 	* Primitives of dynamic runtime size (Eigen-like)
-	* Tests
-* phx
-	* implement a 2D physics engine
-* gfx
-	* add more pixmap fonts
-	* painter should be 2D only, make a separate 3D painter
-	* mesh: cleanup interface (more load_raw; use util::span)
-	* deferred renderer
-		* cascaded shadow maps
-		* CPU frustum culling
-		* solve banding issues
-		* figure out better light volumes clipping
-		* get rid of diffuse materials
-		* find a better specular model (Blinn-Phong seems to over-shine the specular highlight)
-		* optimize ssao: reconstruct position from depth buffer
-		* more sophisticated objects inputs, support pre-made optimization structured
-		* refactor:
-			* remove copy-paste from shaders & rendering routine
-			* split rendering into separate methods
 * parser
 	* overflow checks for number parsers
 	* recursive parsers
 * ui
-	* grid layout quadratic optimization
-	* draggable window element
 	* screen children sorting
+* audio
+    * noise generators
+    * linear, quadratic & any-order feedforward (finite impulse response), feedback (infinite impulse response = resonance) & mixed filters, see https://www.music.mcgill.ca/~gary/618/week1/node11.html
+    * all-pass, band-pass, band-stop filters
+    * echo
+    * delay
+    * overdrive
+    * reverb
+    * spline-based envelopes
+    * drum sounds, maybe more instruments
+    * midi player with effects
+    * 3D listener
+    
+