esphome-xiaomi_bslamp2/rgb_light.h-old

#pragma once

#include <array>
#include <stdexcept>

namespace esphome {
namespace rgbww {
namespace yeelight_bs2 {

class RGBLight
{
public:
    float red = 0;
    float green = 0;
    float blue = 0;
    float white = 0;

    void set_color(float red, float green, float blue, float brightness, float state)
    {
        // Overall, the RGB colors are very usable when simply scaling the
        // RGB channels with the brightness, but around the white point,
        // the color is a bit on the red side of the spectrum. The following
        // scaling was created to fix that.

        // These functions were created, based on actual measurements while
        // using the original firmware, to generate white light
        // (i.e. when RGB = [1,1,1]).
        auto b = brightness * 100.0f;
        auto red_w = 1.00f - (-0.0000121426 * b * b - 0.147576 * b + 93.2335) / 100.0f;
        auto green_w = 1.00f - (-0.0000242425 * b * b - 0.340449 * b + 88.4423) / 100.0f;
        auto blue_w = 1.00f - (-0.0000085869 * b * b - 0.109649 * b + 94.2026) / 100.0f;

        // For colors that are not around the white point, we can scale the
        // RGB channels with the requested brightness, resulting in a very
        // usable color. Not 100% the same as the original firmware, but
        // sometimes even better IMO.
        auto red_c = red * brightness;
        auto green_c = green * brightness;
        auto blue_c = blue * brightness;

        auto level_red = red_c;
        auto level_green = green_c;
        auto level_blue = blue_c;

        //// The actual RGB values are a weighed mix of the above two.
        //// The closer to the white point, the more the white point
        //// value applies.
        //auto min = red;
        //if (blue < min) min = blue;
        //if (green < min) min = green;
        //if (min < 0.8f) min = 0.0f;
        //auto level_red = red_w * min + red_c * (1.0f - min);
        //auto level_green = green_w * min + green_c * (1.0f - min);
        //auto level_blue = blue_w * min + blue_c * (1.0f - min);
        //ESP_LOGD("rgb_light", "min=%f, red_w=%f, red_c=%f, red=%f", min, red_w, red_c, level_red);

        //// A tweak that I noticed in the original firmware and that
        //// were confirmed to be required to get the RGB mode to behave.
        ////if (level_red == 1.0f && level_blue > 0.1f && level_green == 0.0f) {
        ////    level_green = 1.0f - (0.955804f - 0.00334462f * level_blue);
        ////}
        ////if (level_red == 1.0f) {
        ////    level_red = level_blue > 0.1f ? 0.873f : 0.9f;
        ////}
        //if (level_red > 0.9f) level_red = 0.9f;
        //if (level_green > 0.9f) level_green = 0.9f;
        //if (level_blue > 0.9f) level_blue = 0.9f;

        // Invert the signal. The LEDs in the lamp's circuit are brighter
        // when the pwm levels on the GPIO pins are lower.
        this->red = 1.0f - level_red;
        this->green = 1.0f - level_green;
        this->blue = 1.0f - level_blue;
    }
};

} // namespace yeelight_bs2
} // namespace rgbww
} // namespace esphome