more sub-tasks

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diff --git a/TODO.md b/TODO.md
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--- a/TODO.md
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@@ -42,6 +42,12 @@ This file tracks the next set of immediate, actionable tasks for the project.
     - [ ] maybe incorporate the platform time (platform_get_time()) into the PlatformState directly during platform_poll() call?
     - [ ] same with aspect_ratio (platform_get_aspect_ratio()) unless it's not an invariant and the function needs to be called each time
 
+-   ** Task #?: shader code factorization with macros
+    The shader code is rapidly growing big and hairy. We can probably use macros to factorize most common code (normal calc? bump mapping? sampling?) to reduce the code boilerplate.
+
+-   ** Task #?: the SDF calculation should be passed min-distance and max-distance parameters derived from the bounding box hit. This is to narrow the ray-marching and reduce the number of iterations if possible.
+
+
 ## Future Goals
 
 -   **Task #5: Implement Spectrogram Editor**