1 files changed, 40 insertions, 0 deletions
diff --git a/quantum/rgb_matrix_animations/raindrops_anim.h b/quantum/rgb_matrix_animations/raindrops_anim.h
new file mode 100644
index 000000000..fc721375b
--- /dev/null
+++ b/quantum/rgb_matrix_animations/raindrops_anim.h
@@ -0,0 +1,40 @@
+#pragma once
+#ifndef DISABLE_RGB_MATRIX_RAINDROPS
+#include "rgb_matrix_types.h"
+
+extern rgb_counters_t g_rgb_counters;
+extern rgb_config_t rgb_matrix_config;
+
+static void raindrops_set_color(int i) {
+  HSV hsv = { 0 , rgb_matrix_config.sat, rgb_matrix_config.val };
+
+  // Take the shortest path between hues
+  int16_t deltaH = ((rgb_matrix_config.hue + 180) % 360 - rgb_matrix_config.hue) / 4;
+  if (deltaH > 127) {
+    deltaH -= 256;
+  } else if (deltaH < -127) {
+    deltaH += 256;
+  }
+
+  hsv.h = rgb_matrix_config.hue + (deltaH * (rand() & 0x03));
+  RGB rgb = hsv_to_rgb(hsv);
+  rgb_matrix_set_color(i, rgb.r, rgb.g, rgb.b);
+}
+
+bool rgb_matrix_raindrops(effect_params_t* params) {
+  if (!params->init) {
+    // Change one LED every tick, make sure speed is not 0
+    if (scale16by8(g_rgb_counters.tick, qadd8(rgb_matrix_config.speed, 16)) % 10 == 0) {
+      raindrops_set_color(rand() % DRIVER_LED_TOTAL);
+    }
+    return false;
+  }
+
+  RGB_MATRIX_USE_LIMITS(led_min, led_max);
+  for (int i = led_min; i < led_max; i++) {
+    raindrops_set_color(i);
+  }
+  return led_max < DRIVER_LED_TOTAL;
+}
+
+#endif // DISABLE_RGB_MATRIX_RAINDROPS