Retain brightness with lighting layers (#13025)

Add guard `RGBLIGHT_LAYERS_RETAIN_VAL` to retain the currently used val
when applying lighting layers.

1 files changed, 7 insertions, 0 deletions

diff --git a/quantum/rgblight/rgblight.c b/quantum/rgblight/rgblight.c
index 54face173..373dc08d3 100644
--- a/quantum/rgblight/rgblight.c
+++ b/quantum/rgblight/rgblight.c
@@ -694,6 +694,9 @@ bool rgblight_get_layer_state(uint8_t layer) {
 
 // Write any enabled LED layers into the buffer
 static void rgblight_layers_write(void) {
+#    ifdef RGBLIGHT_LAYERS_RETAIN_VAL
+    uint8_t current_val = rgblight_get_val();
+#    endif
     uint8_t i = 0;
     // For each layer
     for (const rgblight_segment_t *const *layer_ptr = rgblight_layers; i < RGBLIGHT_MAX_LAYERS; layer_ptr++, i++) {
@@ -714,7 +717,11 @@ static void rgblight_layers_write(void) {
             // Write segment.count LEDs
             LED_TYPE *const limit = &led[MIN(segment.index + segment.count, RGBLED_NUM)];
             for (LED_TYPE *led_ptr = &led[segment.index]; led_ptr < limit; led_ptr++) {
+#    ifdef RGBLIGHT_LAYERS_RETAIN_VAL
+                sethsv(segment.hue, segment.sat, current_val, led_ptr);
+#    else
                 sethsv(segment.hue, segment.sat, segment.val, led_ptr);
+#    endif
             }
             segment_ptr++;
         }