1 files changed, 29 insertions, 0 deletions
diff --git a/quantum/rgb_matrix/animations/runners/effect_runner_reactive.h b/quantum/rgb_matrix/animations/runners/effect_runner_reactive.h
new file mode 100644
index 0000000000..8485b61f3d
--- /dev/null
+++ b/quantum/rgb_matrix/animations/runners/effect_runner_reactive.h
@@ -0,0 +1,29 @@
+#pragma once
+
+#ifdef RGB_MATRIX_KEYREACTIVE_ENABLED
+
+typedef HSV (*reactive_f)(HSV hsv, uint16_t offset);
+
+bool effect_runner_reactive(effect_params_t* params, reactive_f effect_func) {
+    RGB_MATRIX_USE_LIMITS(led_min, led_max);
+
+    uint16_t max_tick = 65535 / rgb_matrix_config.speed;
+    for (uint8_t i = led_min; i < led_max; i++) {
+        RGB_MATRIX_TEST_LED_FLAGS();
+        uint16_t tick = max_tick;
+        // Reverse search to find most recent key hit
+        for (int8_t j = g_last_hit_tracker.count - 1; j >= 0; j--) {
+            if (g_last_hit_tracker.index[j] == i && g_last_hit_tracker.tick[j] < tick) {
+                tick = g_last_hit_tracker.tick[j];
+                break;
+            }
+        }
+
+        uint16_t offset = scale16by8(tick, rgb_matrix_config.speed);
+        RGB      rgb    = rgb_matrix_hsv_to_rgb(effect_func(rgb_matrix_config.hsv, offset));
+        rgb_matrix_set_color(i, rgb.r, rgb.g, rgb.b);
+    }
+    return led_max < DRIVER_LED_TOTAL;
+}
+
+#endif  // RGB_MATRIX_KEYREACTIVE_ENABLED