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