added "smooth steps" a.k.a. "soft start", to make brightness steps smoother

(also made ramp extras config menu count its own steps)

1 files changed, 45 insertions, 0 deletions

diff --git a/spaghetti-monster/anduril/smooth-steps.c b/spaghetti-monster/anduril/smooth-steps.c
new file mode 100644
index 0000000..9a09228
--- /dev/null
+++ b/spaghetti-monster/anduril/smooth-steps.c
@@ -0,0 +1,45 @@
+// smooth-steps.c: Smooth step adjustments for Anduril.
+// Copyright (C) 2023 Selene ToyKeeper
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include "smooth-steps.h"
+
+#ifdef USE_SMOOTH_STEPS
+
+// one iteration of main loop()
+void smooth_steps_iter() {
+    if (actual_level == smooth_steps_target) {
+        smooth_steps_in_progress = 0;
+        // restore prev_level when animation ends
+        prev_level = smooth_steps_start;
+        return;
+    }
+
+    if (actual_level < smooth_steps_target) {
+        uint8_t diff = smooth_steps_target - actual_level;
+        uint8_t this = diff / smooth_steps_speed;
+        if (!this) this = 1;
+        set_level(actual_level + this);
+    } else if (actual_level > smooth_steps_target) {
+        uint8_t diff = actual_level - smooth_steps_target;
+        uint8_t this = diff / smooth_steps_speed;
+        if (!this) this = 1;
+        set_level(actual_level - this);
+    }
+    // TODO: maybe change the delay based on the speed var?
+    nice_delay_ms(10);
+}
+
+void set_level_smooth(uint8_t level, uint8_t speed) {
+    smooth_steps_target = level;
+    // TODO: maybe speed should be a desired total time for the animation?
+    smooth_steps_speed = speed;
+    smooth_steps_in_progress = 1;
+    // for setting prev_level after animation ends
+    smooth_steps_start = actual_level;
+}
+
+#endif
+