AudibleInstruments/src/Streams/leds.hpp

// Copyright 2013 Emilie Gillet.
//
// Author: Emilie Gillet (emilie.o.gillet@gmail.com)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
// See http://creativecommons.org/licenses/MIT/ for more information.
//
// -----------------------------------------------------------------------------
//
// Driver for the 4 channels LEDs.

#pragma once

#include "stmlib/stmlib.h"

namespace streams
{

const uint8_t kNumLeds = 8;

class LedsEmulator
{
public:
    LedsEmulator() { }
    ~LedsEmulator() { }

    void Init()
    {
        Clear();
    }

    void set(uint8_t led, uint8_t red, uint8_t green)
    {
        red_[led] = red;
        green_[led] = green;
    }

    float intensity_red(uint8_t led)
    {
        return red_[led] / 255.f;
    }

    float intensity_green(uint8_t led)
    {
        return green_[led] / 255.f;
    }

    void Clear()
    {
        std::fill(&red_[0], &red_[kNumLeds], 0);
        std::fill(&green_[0], &green_[kNumLeds], 0);
    }

    void PaintBar(int32_t start, int32_t direction, int32_t db)
    {
        if (db < 0)
        {
            return;
        }

        if (db > 32767)
        {
            db = 32767;
        }

        db <<= 1;

        if (db >= 49152)
        {
            set(start, (db - 49152) >> 6, 0);
            set(start + direction, 255, 255);
            set(start + 2 * direction, 0, 255);
            set(start + 3 * direction, 0, 255);
        }
        else if (db >= 32768)
        {
            set(start + direction, (db - 32768) >> 6, (db - 32768) >> 6);
            set(start + 2 * direction, 0, 255);
            set(start + 3 * direction, 0, 255);
        }
        else if (db >= 16384)
        {
            set(start + 2 * direction, 0, (db - 16384) >> 6);
            set(start + 3 * direction, 0, 255);
        }
        else
        {
            set(start + 3 * direction, 0, db >> 6);
        }
    }

    void PaintPositiveBar(uint8_t channel, int32_t db)
    {
        PaintBar(channel * 4, +1, db);
    }
    void PaintNegativeBar(uint8_t channel, int32_t db)
    {
        PaintBar(channel * 4 + 3, -1, -db);
    }

    void PaintCv(uint8_t channel, int32_t cv)
    {
        uint8_t bank = channel * 4;
        bool flip = false;

        if (cv < 0)
        {
            flip = true;
            cv = -cv;
        }

        if (cv < 1024)
        {
            cv = 0;
        }

        if (cv > 32767)
        {
            cv = 32767;
        }

        for (uint8_t i = 0; i < 4; ++i)
        {
            int16_t residual = (cv - (3 - i) * 8192);

            if (residual < 0)
            {
                residual = 0;
            }
            else if (residual > 8191)
            {
                residual = 8191;
            }

            if (flip)
            {
                set(bank + i, residual >> 5, 0);
            }
            else
            {
                set(bank + i, 0, residual >> 5);
            }
        }
    }

private:
    uint8_t red_[kNumLeds];
    uint8_t green_[kNumLeds];

    DISALLOW_COPY_AND_ASSIGN(LedsEmulator);
};

}  // namespace streams