1 files changed, 39 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..38359cdca
--- /dev/null
+++ b/quantum/rgb_matrix/animations/raindrops_anim.h
@@ -0,0 +1,39 @@
+#ifndef DISABLE_RGB_MATRIX_RAINDROPS
+RGB_MATRIX_EFFECT(RAINDROPS)
+#    ifdef RGB_MATRIX_CUSTOM_EFFECT_IMPLS
+
+static void raindrops_set_color(int i, effect_params_t* params) {
+    if (!HAS_ANY_FLAGS(g_led_config.flags[i], params->flags)) return;
+    HSV hsv = {0, rgb_matrix_config.hsv.s, rgb_matrix_config.hsv.v};
+
+    // Take the shortest path between hues
+    int16_t deltaH = ((rgb_matrix_config.hsv.h + 180) % 360 - rgb_matrix_config.hsv.h) / 4;
+    if (deltaH > 127) {
+        deltaH -= 256;
+    } else if (deltaH < -127) {
+        deltaH += 256;
+    }
+
+    hsv.h   = rgb_matrix_config.hsv.h + (deltaH * (rand() & 0x03));
+    RGB rgb = rgb_matrix_hsv_to_rgb(hsv);
+    rgb_matrix_set_color(i, rgb.r, rgb.g, rgb.b);
+}
+
+bool RAINDROPS(effect_params_t* params) {
+    if (!params->init) {
+        // Change one LED every tick, make sure speed is not 0
+        if (scale16by8(g_rgb_timer, qadd8(rgb_matrix_config.speed, 16)) % 10 == 0) {
+            raindrops_set_color(rand() % DRIVER_LED_TOTAL, params);
+        }
+        return false;
+    }
+
+    RGB_MATRIX_USE_LIMITS(led_min, led_max);
+    for (int i = led_min; i < led_max; i++) {
+        raindrops_set_color(i, params);
+    }
+    return led_max < DRIVER_LED_TOTAL;
+}
+
+#    endif  // RGB_MATRIX_CUSTOM_EFFECT_IMPLS
+#endif      // DISABLE_RGB_MATRIX_RAINDROPS