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- #pragma once
- #ifndef DISABLE_RGB_MATRIX_DIGITAL_RAIN
- #ifndef RGB_DIGITAL_RAIN_DROPS
- // lower the number for denser effect/wider keyboard
- #define RGB_DIGITAL_RAIN_DROPS 24
- #endif
- bool rgb_matrix_digital_rain(effect_params_t* params) {
- // algorithm ported from https://github.com/tremby/Kaleidoscope-LEDEffect-DigitalRain
- const uint8_t drop_ticks = 28;
- const uint8_t pure_green_intensity = 0xd0;
- const uint8_t max_brightness_boost = 0xc0;
- const uint8_t max_intensity = 0xff;
- static uint8_t map[MATRIX_COLS][MATRIX_ROWS] = {{0}};
- static uint8_t drop = 0;
- if (params->init) {
- rgb_matrix_set_color_all(0, 0, 0);
- memset(map, 0, sizeof map);
- drop = 0;
- }
- for (uint8_t col = 0; col < MATRIX_COLS; col++) {
- for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
- if (row == 0 && drop == 0 && rand() < RAND_MAX / RGB_DIGITAL_RAIN_DROPS) {
- // top row, pixels have just fallen and we're
- // making a new rain drop in this column
- map[col][row] = max_intensity;
- }
- else if (map[col][row] > 0 && map[col][row] < max_intensity) {
- // neither fully bright nor dark, decay it
- map[col][row]--;
- }
- // set the pixel colour
- uint8_t led[LED_HITS_TO_REMEMBER];
- uint8_t led_count = rgb_matrix_map_row_column_to_led(row, col, led);
- // TODO: multiple leds are supported mapped to the same row/column
- if (led_count > 0) {
- if (map[col][row] > pure_green_intensity) {
- const uint8_t boost = (uint8_t) ((uint16_t) max_brightness_boost * (map[col][row] - pure_green_intensity) / (max_intensity - pure_green_intensity));
- rgb_matrix_set_color(led[0], boost, max_intensity, boost);
- }
- else {
- const uint8_t green = (uint8_t) ((uint16_t) max_intensity * map[col][row] / pure_green_intensity);
- rgb_matrix_set_color(led[0], 0, green, 0);
- }
- }
- }
- }
- if (++drop > drop_ticks) {
- // reset drop timer
- drop = 0;
- for (uint8_t row = MATRIX_ROWS - 1; row > 0; row--) {
- for (uint8_t col = 0; col < MATRIX_COLS; col++) {
- // if ths is on the bottom row and bright allow decay
- if (row == MATRIX_ROWS - 1 && map[col][row] == max_intensity) {
- map[col][row]--;
- }
- // check if the pixel above is bright
- if (map[col][row - 1] == max_intensity) {
- // allow old bright pixel to decay
- map[col][row - 1]--;
- // make this pixel bright
- map[col][row] = max_intensity;
- }
- }
- }
- }
- return false;
- }
- #endif // DISABLE_RGB_MATRIX_DIGITAL_RAIN
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