IPlugCLAP.h

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/*
 ==============================================================================
 
 This file is part of the iPlug 2 library. Copyright (C) the iPlug 2 developers. 
 
 See LICENSE.txt for  more info.
 
 ==============================================================================
*/
 
#ifndef _IPLUGAPI_
#define _IPLUGAPI_
// Only load one API class!
 
#include "IPlugAPIBase.h"
#include "IPlugProcessor.h"
#include "plugin.hh"
 
#include "config.h"   // This is your plugin's config.h.
 
BEGIN_IPLUG_NAMESPACE
 
struct InstanceInfo
{
  const clap_plugin_descriptor* mDesc;
  const clap_host* mHost;
};
 
// Set the level of host checking based on if this is debug build
 
#ifdef _DEBUG
using ClapPluginHelper = clap::helpers::Plugin<clap::helpers::MisbehaviourHandler::Terminate, clap::helpers::CheckingLevel::Maximal>;
using ClapHost = clap::helpers::HostProxy<clap::helpers::MisbehaviourHandler::Terminate, clap::helpers::CheckingLevel::Maximal>;
#else
using ClapPluginHelper = clap::helpers::Plugin<clap::helpers::MisbehaviourHandler::Ignore, clap::helpers::CheckingLevel::None>;
using ClapHost = clap::helpers::HostProxy<clap::helpers::MisbehaviourHandler::Ignore, clap::helpers::CheckingLevel::None>;
#endif
 
class IPlugCLAP : public IPlugAPIBase
                , public IPlugProcessor
                , public ClapPluginHelper
{
  struct ParamToHost
  {
    enum class Type { Begin, Value, End };
 
    ParamToHost()
      : mType(Type::Value)
      , mIdx(-1)
      , mValue(0.0)
    {}
 
    ParamToHost(Type type, int idx, double value)
      : mType(type)
      , mIdx(idx)
      , mValue(value)
    {}
 
    uint32_t idx() const { return static_cast<uint32_t>(mIdx); }
    double value() const { return mValue; }
    uint16_t type() const
    {
      switch (mType)
      {
        case Type::Begin:   return CLAP_EVENT_PARAM_GESTURE_BEGIN;
        case Type::End:     return CLAP_EVENT_PARAM_GESTURE_END;
        case Type::Value:   // fall through
        default:            return CLAP_EVENT_PARAM_VALUE;
      }
    }
    
    Type mType;
    int mIdx;
    double mValue;
  };
  
public:
  IPlugCLAP(const InstanceInfo& info, const Config& config);
 
  // IPlugAPIBase
  void BeginInformHostOfParamChange(int idx) override;
  void InformHostOfParamChange(int idx, double normalizedValue) override;
  void EndInformHostOfParamChange(int idx) override;
  bool EditorResize(int viewWidth, int viewHeight) override;
  
  // IPlugProcessor
  void SetTailSize(int tailSize) override;
  void SetLatency(int samples) override;
  bool SendMidiMsg(const IMidiMsg& msg) override;
  bool SendSysEx(const ISysEx& msg) override;
 
private:
  // clap_plugin
  bool init() noexcept override;
  bool activate(double sampleRate, uint32_t minFrameCount, uint32_t maxFrameCount) noexcept override;
  void deactivate() noexcept override;
  bool startProcessing() noexcept override { return true; }
  void stopProcessing() noexcept override {}
  clap_process_status process(const clap_process* pProcess) noexcept override;
  
  // clap_plugin_latency
  bool implementsLatency() const noexcept override { return true; }
  uint32_t latencyGet() const noexcept override { return GetLatency(); }
  
  // clap_plugin_tail
  bool implementsTail() const noexcept override { return true; }
  uint32_t tailGet() const noexcept override;
 
  // clap_plugin_render
  bool implementsRender() const noexcept override { return true; }
  bool renderHasHardRealtimeRequirement() noexcept override { return false; }
  bool renderSetMode(clap_plugin_render_mode mode) noexcept override;
  
  // clap_plugin_state
  bool implementsState() const noexcept override { return true; }
  bool stateSave(const clap_ostream* pStream) noexcept override;
  bool stateLoad(const clap_istream* pStream) noexcept override;
 
  // clap_plugin_audio_ports
  bool implementsAudioPorts() const noexcept override;
  uint32_t audioPortsCount(bool isInput) const noexcept override;
  bool audioPortsInfo(uint32_t index, bool isInput, clap_audio_port_info* pInfo) const noexcept override;
  
  // clap_plugin_audio_ports_config
  bool implementsAudioPortsConfig() const noexcept override;
  uint32_t audioPortsConfigCount() const noexcept override;
  bool audioPortsGetConfig(uint32_t index, clap_audio_ports_config* pConfig) const noexcept override;
  bool audioPortsSetConfig(clap_id configIdx) noexcept override;
  
  // clap_plugin_note_ports
  bool implementsNotePorts() const noexcept override { return DoesMIDIIn() || DoesMIDIOut(); }
  uint32_t notePortsCount(bool isInput) const noexcept override;
  bool notePortsInfo(uint32_t index, bool isInput, clap_note_port_info* pInfo) const noexcept override;
  
  // clap_plugin_params
  bool implementsParams() const noexcept override { return true; }
  uint32_t paramsCount() const noexcept override { return NParams(); }
  
  bool paramsInfo(uint32_t paramIdx, clap_param_info* pInfo) const noexcept override;
  
  bool paramsValue(clap_id paramIdx, double* pValue) noexcept override;
  bool paramsValueToText(clap_id paramIdx, double value, char* display, uint32_t size) noexcept override;
  bool paramsTextToValue(clap_id paramIdx, const char* display, double* pValue) noexcept override;
 
  void paramsFlush(const clap_input_events* pInputParamChanges, const clap_output_events* pOutputParamChanges) noexcept override;
  bool isValidParamId(clap_id paramIdx) const noexcept override { return paramIdx < NParams(); }
 
  // clap_plugin_gui
  bool implementsGui() const noexcept override;
  bool guiCreate(const char* api, bool isFloating) noexcept override;
  void guiDestroy() noexcept override;
  
  bool guiSetScale(double scale) noexcept override;
  bool guiShow() noexcept override;
  bool guiHide() noexcept override;
  bool guiGetSize(uint32_t* pWidth, uint32_t* pHeight) noexcept override;
  
  bool guiCanResize() const noexcept override;
  bool guiAdjustSize(uint32_t* pWidth, uint32_t* pHeight) noexcept override;
  bool guiSetSize(uint32_t width, uint32_t height) noexcept override;
 
  // clap_plugin_gui_cocoa/win32
  bool guiIsApiSupported(const char* api, bool isFloating) noexcept override;
  bool guiSetParent(const clap_window* pWindow) noexcept override;
  
  // Helper to attach GUI Windows
  bool GUIWindowAttach(void* parent) noexcept;
  
  // Parameter Helpers
  void ProcessInputEvents(const clap_input_events* pInputEvents) noexcept;
  void ProcessOutputParams(const clap_output_events* pOutputParamChanges) noexcept;
  void ProcessOutputEvents(const clap_output_events* pOutputEvents, int nFrames) noexcept;
 
  // IPlug2-style host retrieval
  ClapHost& GetClapHost() { return _host; }
  
  // IPlug Config Helpers
  void SetDefaultConfig();
  int RequiredChannels() const;
  uint32_t NBuses(ERoute direction) const;
  uint32_t NChannels(ERoute direction, uint32_t bus) const;
  uint32_t NBuses(ERoute direction, int configIdx) const;
  uint32_t NChannels(ERoute direction, uint32_t bus, int configIdx) const;
  
  IPlugQueue<ParamToHost> mParamValuesToHost {PARAM_TRANSFER_SIZE};
  IMidiQueueBase<SysExData> mSysExToHost;
  IMidiQueue mMidiToHost;
  WDL_TypedBuf<float *> mAudioIO32;
  WDL_TypedBuf<double *> mAudioIO64;
  int mConfigIdx = 0;
  int mTailCount = 0;
  bool mHostHasTail = false;
  bool mTailUpdate = false;
  bool mLatencyUpdate = false;
  
  void* mWindow = nullptr;
  bool mGUIOpen = false;
};
 
IPlugCLAP* MakePlug(const InstanceInfo& info);
 
END_IPLUG_NAMESPACE
 
#endif