blinky-esp/main/leds.hpp

#pragma once

#include <cstdint>
#include <string>


struct Color {
    uint8_t r, g, b;
} __attribute__ ((packed));

typedef uint16_t Fixed;
constexpr int factor = 65536;
constexpr int shift = 16;


struct Gradient {
    Color at(Fixed x) const;

    unsigned int n_colors;
    Color colors[];
};

struct Pattern {
    void step(Color[], int, int64_t &last_us, Fixed &offset) const;

    int cycle_length;
    int cycle_time_ms;
    bool reverse;
    bool march;
    Gradient gradient;
};

class LEDStrip {
public:
    LEDStrip(int length = 0);

    void step();

    virtual void show() = 0;
    virtual void length_changing(int) {};

    void setPattern(const Pattern *_pattern) { pattern = _pattern; }
    const Pattern* getPattern() const { return pattern; }

    void setLength(int length);
    int getLength() const { return length; }

protected:
    int length;
    const Pattern *pattern;
    Color *pixels;

private:
    int64_t last_us;
    Fixed offset;
};

class TerminalLEDs : public LEDStrip {
public:
    TerminalLEDs(int length = 0) : LEDStrip(length) {}
    void show();
};