zero crossing counter is often larger than in the prototype by @troyhacks - due to calculation after filtering (catches more crossings), and due to the fixed condition for detecting zero crossings (doubles the number of crossings).
This patch reduces the final value to 2/3, so it typically stays below 256.
Troy's zeroCrossingCount - counts zero crossings inside audioreactive, and makes the number availeable to other usermods and effects.
This PR is a prerequisite for PR #124 (auto playlist)
* calculate zero crossings after filtering out DC offsets
* update effect variable only once
* fix a logic error when detecting zero crossings
* fix array bounds violation when creating umdata entries
Trying to solve CI build errors
Tool Manager: Installing platformio/tool-scons @ ~4.40400.0
Error: Could not find the package with 'platformio/tool-scons @ ~4.40400.0' requirements for your system 'linux_x86_64'
If the segment is wider than 20 pixels, we optimize calculations due to symmetry - for smaller arcs the result looks better without optimization.
As a side-effect, we have enough computing power left to go through the complete circumference, avoiding holes.
as it turns out, the "_t" functions (from wled_math.cpp) are about 3 times (!!!) slower than the standard functions.
* mapping modes : Arc and Circle
* effects: 2D Drift, 2D Drift Rose
* use "float" math only - sinf(), cosf(), roundf()
* use fewer "rays" for medium-sized matrix (<=32 pixels wide/high)
* ray drawing optimized to use fixed point
up to 80% faster on esp32 and esp32-S3; -S2/-C3 should also see benefits, as these do not have floating point support in hardware.
Release the json buffer lock as soon as we've finished serializing.
This should slightly reduce the number of lock collisions as the
response class isn't destructed until after the last packet is ack'd.
