1 #if defined(RGB_MATRIX_FRAMEBUFFER_EFFECTS) && !defined(DISABLE_RGB_MATRIX_DIGITAL_RAIN)
2 RGB_MATRIX_EFFECT(DIGITAL_RAIN)
3 #ifdef RGB_MATRIX_CUSTOM_EFFECT_IMPLS
5 #ifndef RGB_DIGITAL_RAIN_DROPS
6 // lower the number for denser effect/wider keyboard
7 #define RGB_DIGITAL_RAIN_DROPS 24
10 bool DIGITAL_RAIN(effect_params_t* params) {
11 // algorithm ported from https://github.com/tremby/Kaleidoscope-LEDEffect-DigitalRain
12 const uint8_t drop_ticks = 28;
13 const uint8_t pure_green_intensity = 0xd0;
14 const uint8_t max_brightness_boost = 0xc0;
15 const uint8_t max_intensity = 0xff;
17 static uint8_t drop = 0;
20 rgb_matrix_set_color_all(0, 0, 0);
21 memset(rgb_frame_buffer, 0, sizeof(rgb_frame_buffer));
25 for (uint8_t col = 0; col < MATRIX_COLS; col++) {
26 for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
27 if (row == 0 && drop == 0 && rand() < RAND_MAX / RGB_DIGITAL_RAIN_DROPS) {
28 // top row, pixels have just fallen and we're
29 // making a new rain drop in this column
30 rgb_frame_buffer[row][col] = max_intensity;
32 else if (rgb_frame_buffer[row][col] > 0 && rgb_frame_buffer[row][col] < max_intensity) {
33 // neither fully bright nor dark, decay it
34 rgb_frame_buffer[row][col]--;
36 // set the pixel colour
37 uint8_t led[LED_HITS_TO_REMEMBER];
38 uint8_t led_count = rgb_matrix_map_row_column_to_led(row, col, led);
40 // TODO: multiple leds are supported mapped to the same row/column
42 if (rgb_frame_buffer[row][col] > pure_green_intensity) {
43 const uint8_t boost = (uint8_t) ((uint16_t) max_brightness_boost * (rgb_frame_buffer[row][col] - pure_green_intensity) / (max_intensity - pure_green_intensity));
44 rgb_matrix_set_color(led[0], boost, max_intensity, boost);
47 const uint8_t green = (uint8_t) ((uint16_t) max_intensity * rgb_frame_buffer[row][col] / pure_green_intensity);
48 rgb_matrix_set_color(led[0], 0, green, 0);
54 if (++drop > drop_ticks) {
57 for (uint8_t row = MATRIX_ROWS - 1; row > 0; row--) {
58 for (uint8_t col = 0; col < MATRIX_COLS; col++) {
59 // if ths is on the bottom row and bright allow decay
60 if (row == MATRIX_ROWS - 1 && rgb_frame_buffer[row][col] == max_intensity) {
61 rgb_frame_buffer[row][col]--;
63 // check if the pixel above is bright
64 if (rgb_frame_buffer[row - 1][col] == max_intensity) {
65 // allow old bright pixel to decay
66 rgb_frame_buffer[row - 1][col]--;
67 // make this pixel bright
68 rgb_frame_buffer[row][col] = max_intensity;
76 #endif // RGB_MATRIX_CUSTOM_EFFECT_IMPLS
77 #endif // defined(RGB_MATRIX_FRAMEBUFFER_EFFECTS) && !defined(DISABLE_RGB_MATRIX_DIGITAL_RAIN)