layers.h

Go to the documentation of this file.

// layers.h - the three ring-native looks that MoodPainter mixes.
//
// Each layer renders the whole ring into its own float canvas every frame
// and is blind to the others. The painter weights them by RoomSense::calm /
// flow / groove, so a layer only has to look right at full strength.
//
// Nothing in a layer steps. Hits go through a Follower with a short attack
// so even an instant event ramps over a frame or two, and every position is
// advanced by rate * dt rather than snapped.
#pragma once
 
#include "FastLED.h"
#include "fl/stl/stdint.h"
 
#include "mood_palette.h"
#include "ring_canvas.h"
#include "room_sense.h"
 
namespace mood_ring {

class BreathLayer {
  public:
    void render(const RoomSense &s, const MoodPalette &pal, float dtSec,
                RingCanvas &c);
 
  private:
    float mBreath = 0.0f; 
    float mPosA = 0.0f;   
    float mPosB = 0.5f;
};

class FlowLayer {
  public:
    void render(const RoomSense &s, const MoodPalette &pal, float dtSec,
                RingCanvas &c);
 
  private:
    struct Grain {
        int index = 0;
        float ageSec = 0.0f;
        bool active = false;
    };
    static const int kMaxGrains = 24;
 
    void spawnGrains(const RoomSense &s, float dtSec, int ringSize);
    void drawGrains(const MoodPalette &pal, float dtSec, RingCanvas &c);
 
    float mPosA = 0.0f;
    float mPosB = 0.5f;
    float mHueWalk = 0.0f;
    float mSpawnBudget = 0.0f;
    Follower mBody;
    Follower mSigma;
    Grain mGrains[kMaxGrains];
    Xorshift mRng{0xC0FFEE11u};
};

class GrooveLayer {
  public:
    void render(const RoomSense &s, const MoodPalette &pal, float dtSec,
                RingCanvas &c);
 
  private:
    static const int kMarkers = 4;
 
    float mRotation = 0.0f;   
    float mCorrection = 0.0f; 
    Follower mSwell;
    Follower mFlash;
    Follower mSnare;
};
 
} // namespace mood_ring