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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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