1 files changed, 31 insertions, 0 deletions
diff --git a/quantum/rgb_matrix_runners/effect_runner_reactive.h b/quantum/rgb_matrix_runners/effect_runner_reactive.h
new file mode 100644
index 0000000000..94cd7d5452
--- /dev/null
+++ b/quantum/rgb_matrix_runners/effect_runner_reactive.h
@@ -0,0 +1,31 @@
+#pragma once
+
+#ifdef RGB_MATRIX_KEYREACTIVE_ENABLED
+
+typedef void (*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);
+
+  HSV hsv = { rgb_matrix_config.hue, rgb_matrix_config.sat, rgb_matrix_config.val };
+  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);
+    effect_func(&hsv, offset);
+    RGB rgb = hsv_to_rgb(hsv);
+    rgb_matrix_set_color(i, rgb.r, rgb.g, rgb.b);
+  }
+  return led_max < DRIVER_LED_TOTAL;
+}
+
+#endif // RGB_MATRIX_KEYREACTIVE_ENABLED