text: //------------------------------------------------------------------------
  // Project     : VST SDK
  //
  // Category    : Examples
  // Filename    : public.sdk/samples/vst/again/source/againsimple.h
  // Created by  : Steinberg, 04/2005
  // Description : AGain Example for VST SDK 3.0
  //
  //-----------------------------------------------------------------------------
  // LICENSE
  // (c) 2019, Steinberg Media Technologies GmbH, All Rights Reserved
  //-----------------------------------------------------------------------------
  // Redistribution and use in source and binary forms, with or without modification,
  // are permitted provided that the following conditions are met:
  // 
  //   * Redistributions of source code must retain the above copyright notice, 
  //     this list of conditions and the following disclaimer.
  //   * Redistributions in binary form must reproduce the above copyright notice,
  //     this list of conditions and the following disclaimer in the documentation 
  //     and/or other materials provided with the distribution.
  //   * Neither the name of the Steinberg Media Technologies nor the names of its
  //     contributors may be used to endorse or promote products derived from this 
  //     software without specific prior written permission.
  // 
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
  // ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
  // WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
  // IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
  // INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 
  // BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 
  // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 
  // LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 
  // OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  // OF THE POSSIBILITY OF SUCH DAMAGE.
  //-----------------------------------------------------------------------------
  
  #pragma once
  
  // must always come first
  #include "public.sdk/source/vst/vstsinglecomponenteffect.h"
  //------------------------------------------------------------------------
  
  #include "public.sdk/source/vst/vstguieditor.h"
  #include "pluginterfaces/vst/ivstcontextmenu.h"
  #include "pluginterfaces/vst/ivstplugview.h"
  
  #include "vstgui/plugin-bindings/vst3editor.h"
  
  namespace Steinberg {
  namespace Vst {
  
  template <typename T>
  class AGainUIMessageController;
  
  //------------------------------------------------------------------------
  // AGain as combined processor and controller
  //------------------------------------------------------------------------
  class AGainSimple : public SingleComponentEffect, public VSTGUI::VST3EditorDelegate
  {
  public:
  //------------------------------------------------------------------------
  	using UIMessageController = AGainUIMessageController<AGainSimple>;
  	using UTF8StringPtr = VSTGUI::UTF8StringPtr;
  	using IUIDescription = VSTGUI::IUIDescription;
  	using IController = VSTGUI::IController;
  	using VST3Editor = VSTGUI::VST3Editor;
  
  	AGainSimple ();
  
  	static FUnknown* createInstance (void* context) { return (IAudioProcessor*)new AGainSimple; }
  
  	tresult PLUGIN_API initialize (FUnknown* context) SMTG_OVERRIDE;
  	tresult PLUGIN_API terminate () SMTG_OVERRIDE;
  	tresult PLUGIN_API setActive (TBool state) SMTG_OVERRIDE;
  	tresult PLUGIN_API process (ProcessData& data) SMTG_OVERRIDE;
  	tresult PLUGIN_API canProcessSampleSize (int32 symbolicSampleSize) SMTG_OVERRIDE;
  	tresult PLUGIN_API setState (IBStream* state) SMTG_OVERRIDE;
  	tresult PLUGIN_API getState (IBStream* state) SMTG_OVERRIDE;
  	tresult PLUGIN_API setupProcessing (ProcessSetup& newSetup) SMTG_OVERRIDE;
  	tresult PLUGIN_API setBusArrangements (SpeakerArrangement* inputs, int32 numIns,
  	                                       SpeakerArrangement* outputs,
  	                                       int32 numOuts) SMTG_OVERRIDE;
  
  	IPlugView* PLUGIN_API createView (const char* name) SMTG_OVERRIDE;
  	tresult PLUGIN_API setEditorState (IBStream* state) SMTG_OVERRIDE;
  	tresult PLUGIN_API getEditorState (IBStream* state) SMTG_OVERRIDE;
  	tresult PLUGIN_API setParamNormalized (ParamID tag, ParamValue value) SMTG_OVERRIDE;
  	tresult PLUGIN_API getParamStringByValue (ParamID tag, ParamValue valueNormalized,
  	                                          String128 string) SMTG_OVERRIDE;
  	tresult PLUGIN_API getParamValueByString (ParamID tag, TChar* string,
  	                                          ParamValue& valueNormalized) SMTG_OVERRIDE;
  
  	//---from VST3EditorDelegate-----------
  	IController* createSubController (UTF8StringPtr name, const IUIDescription* description,
  	                                  VST3Editor* editor) SMTG_OVERRIDE;
  
  	//---Internal functions-------
  	void addUIMessageController (UIMessageController* controller);
  	void removeUIMessageController (UIMessageController* controller);
  	void setDefaultMessageText (String128 text);
  	TChar* getDefaultMessageText ();
  
  
  	//------------------------------------------------------------------------
  	template <typename SampleType>
  	SampleType processAudio (SampleType** in, SampleType** out, int32 numChannels,
  		int32 sampleFrames, float gain)
  	{
  		SampleType vuPPM = 0;
  
  		// in real Plug-in it would be better to do dezippering to avoid jump (click) in gain value
  		for (int32 i = 0; i < numChannels; i++)
  		{
  			int32 samples = sampleFrames;
  			auto* ptrIn = (SampleType*)in[i];
  			auto* ptrOut = (SampleType*)out[i];
  			SampleType tmp;
  			while (--samples >= 0)
  			{
  				// apply gain
  				tmp = (*ptrIn++) * gain;
  				(*ptrOut++) = tmp;
  
  				// check only positive values
  				if (tmp > vuPPM)
  				{
  					vuPPM = tmp;
  				}
  			}
  		}
  		return vuPPM;
  	}
  
  //------------------------------------------------------------------------
  private:
  	// our model values
  	float fGain;
  	float fGainReduction;
  	float fVuPPMOld;
  
  	int32 currentProcessMode;
  
  	bool bHalfGain;
  	bool bBypass;
  
  	using UIMessageControllerList = std::vector<UIMessageController*>;
  	UIMessageControllerList uiMessageControllers;
  
  	String128 defaultMessageText;
  };
  
  //------------------------------------------------------------------------
  } // namespace Vst
  } // namespace Steinberg
  