IBMeterControl example

IPlugEffect.cpp

#include "IPlugEffect.h"
#include "IPlug_include_in_plug_src.h"
#include "IControls.h"

int kCtrlTagMeter = 0;

IPlugEffect::IPlugEffect(const InstanceInfo& info)
: Plugin(info, MakeConfig(kNumParams, kNumPresets))
{
  GetParam(kGain)->InitDouble("Gain", 0., 0., 100.0, 0.01, "%");

  mMakeGraphicsFunc = [&]() {
    return MakeGraphics(*this, PLUG_WIDTH, PLUG_HEIGHT, PLUG_FPS, GetScaleForScreen(PLUG_WIDTH, PLUG_HEIGHT));
  };
  
  mLayoutFunc = [&](IGraphics* pGraphics) {
    pGraphics->AttachCornerResizer(EUIResizerMode::Scale, false);
    pGraphics->AttachPanelBackground(COLOR_GRAY);
    pGraphics->LoadFont("Roboto-Regular", ROBOTO_FN);
    auto meterBmp = pGraphics->LoadBitmap(METER_FN, 63);
    pGraphics->AttachControl(new IBMeterControl(100,100, meterBmp), kCtrlTagMeter);
  };
}

void IPlugEffect::ProcessBlock(sample** inputs, sample** outputs, int nFrames)
{
  const double gain = GetParam(kGain)->Value() / 100.;
  const int nChans = NOutChansConnected();
  
  for (int s = 0; s < nFrames; s++) {
    for (int c = 0; c < nChans; c++) {
      outputs[c][s] = inputs[c][s] * gain;
    }
  }
  
  mSender.ProcessBlock(outputs, nFrames, kCtrlTagMeter);
}

IPlugEffect.h

#pragma once

#include "IPlug_include_in_plug_hdr.h"
#include "ISender.h"

const int kNumPresets = 1;

enum EParams
{
  kGain = 0,
  kNumParams
};

using namespace iplug;
using namespace igraphics;

class IPlugEffect final : public Plugin
{
public:
  IPlugEffect(const InstanceInfo& info);
 
  void OnIdle() override
  {
    mSender.TransmitData(*this);
  }
  
  void ProcessBlock(sample** inputs, sample** outputs, int nFrames) override;
  
  IPeakAvgSender<1> mSender;
};