diff options
Diffstat (limited to 'quantum/rgblight.c')
| -rw-r--r-- | quantum/rgblight.c | 31 |
1 files changed, 27 insertions, 4 deletions
diff --git a/quantum/rgblight.c b/quantum/rgblight.c index f9e9da167..52d8da181 100644 --- a/quantum/rgblight.c +++ b/quantum/rgblight.c @@ -1163,16 +1163,39 @@ void rgblight_effect_knight(animation_status_t *anim) { #endif #ifdef RGBLIGHT_EFFECT_CHRISTMAS +# define CUBED(x) ((x) * (x) * (x)) + +/** + * Christmas lights effect, with a smooth animation between red & green. + */ void rgblight_effect_christmas(animation_status_t *anim) { - uint8_t hue; + static int8_t increment = 1; + const uint8_t max_pos = 32; + const uint8_t hue_green = 85; + + uint32_t xa; + uint8_t hue, val; uint8_t i; - anim->current_offset = (anim->current_offset + 1) % 2; + // The effect works by animating anim->pos from 0 to 32 and back to 0. + // The pos is used in a cubic bezier formula to ease-in-out between red and green, leaving the interpolated colors visible as short as possible. + xa = CUBED((uint32_t) anim->pos); + hue = ((uint32_t) hue_green) * xa / (xa + CUBED((uint32_t) (max_pos - anim->pos))); + // Additionally, these interpolated colors get shown with a slightly darker value, to make them less prominent than the main colors. + val = 255 - (3 * (hue < hue_green / 2 ? hue : hue_green - hue) / 2); + for (i = 0; i < rgblight_ranges.effect_num_leds; i++) { - hue = 0 + ((i / RGBLIGHT_EFFECT_CHRISTMAS_STEP + anim->current_offset) % 2) * 85; - sethsv(hue, rgblight_config.sat, rgblight_config.val, (LED_TYPE *)&led[i + rgblight_ranges.effect_start_pos]); + uint8_t local_hue = (i / RGBLIGHT_EFFECT_CHRISTMAS_STEP) % 2 ? hue : hue_green - hue; + sethsv(local_hue, rgblight_config.sat, val, (LED_TYPE *)&led[i + rgblight_ranges.effect_start_pos]); } rgblight_set(); + + if (anim->pos == 0) { + increment = 1; + } else if (anim->pos == max_pos) { + increment = -1; + } + anim->pos += increment; } #endif |