Add Junco Keyboard (#19516)

keyboards/junco/keymaps/deluxe/rgb_matrix_user.inc

@@ -0,0 +1,48 @@
+// Copyright 2022 Dane Skalski (@Daneski13)
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+RGB_MATRIX_EFFECT(WHITE_UNDERGLOW_CYCLE)
+RGB_MATRIX_EFFECT(PIXEL_RAIN_UNDERGLOW_CYCLE)
+
+#ifdef RGB_MATRIX_CUSTOM_EFFECT_IMPLS
+
+// This is a modified version of the effect_runner_dx_dy_dist function from rgb_matrix
+// that only applies the effect to the underglow LEDs of this keyboard
+static bool underglow_effect_runner(effect_params_t* params, dx_dy_dist_f underglow_effect_func, bool backlight_white) {
+    RGB_MATRIX_USE_LIMITS(led_min, led_max);
+
+    HSV hsv = rgb_matrix_config.hsv;
+    HSV white = {0, 0, hsv.v};
+    RGB rgb = rgb_matrix_hsv_to_rgb(white);
+    uint8_t time = scale16by8(g_rgb_timer, rgb_matrix_config.speed / 2);
+    for (uint8_t i = led_min; i < led_max; i++) {
+        // Underglow LEDs are indicies 0 - 7 and 37 - 44
+        if ((i <= 7) || (37 <= i && i <= 44)) {
+            // Apply the maths and colors to the underglow LEDs
+            RGB_MATRIX_TEST_LED_FLAGS();
+            int16_t dx   = g_led_config.point[i].x - k_rgb_matrix_center.x;
+            int16_t dy   = g_led_config.point[i].y - k_rgb_matrix_center.y;
+            uint8_t dist = sqrt16(dx * dx + dy * dy);
+            RGB     rgb  = rgb_matrix_hsv_to_rgb(underglow_effect_func(hsv, dx, dy, dist, time));
+            rgb_matrix_set_color(i, rgb.r, rgb.g, rgb.b);
+        } else {
+            // Set the backlight to white if needed
+            if (!backlight_white) continue;
+            rgb_matrix_set_color(i, rgb.r, rgb.g, rgb.b);
+        }
+    }
+    return rgb_matrix_check_finished_leds(led_max);
+}
+
+// Solid white but the underglow is a rainbow spiral
+static bool WHITE_UNDERGLOW_CYCLE(effect_params_t* params) {
+    return underglow_effect_runner(params, &CYCLE_SPIRAL_math, true);
+}
+
+// Pixel rain effect but the underglow is a rainbow spiral
+static bool PIXEL_RAIN_UNDERGLOW_CYCLE(effect_params_t* params) {
+    PIXEL_RAIN(params);
+    return underglow_effect_runner(params, &CYCLE_SPIRAL_math, false);
+}
+
+#endif