pgpl/tests/plugin.cpp

#include "clap/clap.h"
#include <cmath>
#include <cstdint>
#include <cstdlib>
#include <cstring>
#include <pgpl.h>
#include <stdio.h>
#include <string>
#include <time.h>
#include <vector>

static std::string *font_path;

struct Note {
  int32_t key;
  int32_t note_id;
  int32_t channel;
  float phase;
};

class PluginGUI {
public:
  PluginGUI() {
    strcpy(counter_buffer, "0");
    counter = 0;

    font = pgpl_font_create_from_file(font_path->c_str(), 256);

    pgpl_gui_theme_configure(&theme, pgpl_color_create(255, 255, 255, 255), 48,
                             font);

    gui = pgpl_gui_create("PGPL Test", 320, 320, 0, 0, &theme, this);

    pgpl_gui_widget_add(gui, create_main_view());

    pgpl_gui_run_and_show(gui, false);
  }

  ~PluginGUI() { pgpl_font_destroy(NULL, font); }

  inline PGPL_WindowThread *get_window() { return gui->window_thread; }

private:
  static void on_counter_button_click(void *data) {
    PluginGUI *app = (PluginGUI *)data;
    app->counter++;
    snprintf(app->counter_buffer, sizeof(app->counter_buffer), "%d",
             app->counter);

    if (app->counter % 10 == 0) {
      pgpl_gui_theme_configure(
          &app->gui->theme,
          pgpl_color_create(rand() % 256, rand() % 256, rand() % 256, 255), 48,
          app->gui->theme.font);
    }
  }

  PGPL_GuiWidget *create_main_view() {
    PGPL_GuiButtonWidget *counter_button;
    PGPL_GuiTextWidget *counter;

    column_layout = pgpl_gui_container_layout_create(
        PGPL_GUI_CONTAINER_LAYOUT_DIRECTION_VERTICAL);

    counter_button =
        pgpl_gui_button_widget_create("Click me!", on_counter_button_click);

    counter = pgpl_gui_text_widget_create(counter_buffer);
    counter->parent.font_size = PGPL_GUI_FONT_SIZE_TITLE;
    counter->parent.background = false;
    counter->parent.border = false;

    pgpl_gui_container_layout_widget_add(column_layout, &counter->parent);
    pgpl_gui_container_layout_widget_add(column_layout,
                                         &counter_button->parent);

    return (PGPL_GuiWidget *)column_layout;
  }

  PGPL_GuiContainerLayout *column_layout;
  PGPL_Gui *gui;
  PGPL_GuiTheme theme;
  PGPL_Font *font;
  int counter;
  char counter_buffer[128];
};

class PluginState {
public:
  void process_event(const clap_event_header_t *event) {
    if (event->space_id == CLAP_CORE_EVENT_SPACE_ID) {
      if (event->type == CLAP_EVENT_NOTE_OFF ||
          event->type == CLAP_EVENT_NOTE_CHOKE) {
        const clap_event_note_t *note_event = (const clap_event_note_t *)event;

        for (size_t i = 0; i < this->notes.size(); i++) {
          Note &note = this->notes[i];

          if (note_event->note_id == note.note_id ||
              note_event->note_id == -1) {
            this->notes.erase(this->notes.begin() + i--);
          }
        }

      } else if (event->type == CLAP_EVENT_NOTE_ON) {
        const clap_event_note_t *note_event = (const clap_event_note_t *)event;
        this->notes.push_back(
            {note_event->key, note_event->note_id, note_event->channel, 0.0f});
      }
    }
  }

  void render_audio(float *outputL, float *outputR, uint32_t length) {
    for (uint32_t index = 0; index < length; index++) {
      float sum = 0.0f;

      for (size_t i = 0; i < this->notes.size(); i++) {
        Note &note = this->notes[i];
        sum += sinf(2.0f * 3.14159f * 440.0f *
                    exp2f((note.key - 81.0f) / 12.0f) * note.phase) *
               0.2f;
        note.phase += 1.0f / sample_rate;
        note.phase -= floorf(note.phase);
      }

      outputL[index] = sum;
      outputR[index] = sum;
    }
  }

  inline void set_sample_rate(uint32_t sample_rate) {
    this->sample_rate = sample_rate;
  }

  inline void create_window() { gui = new PluginGUI(); }

  inline void destroy_window() { delete gui; }

  inline PGPL_WindowThread *get_window() {
    if (gui) {
      return gui->get_window();
    }
    return nullptr;
  }

private:
  uint32_t sample_rate;
  std::vector<Note> notes;
  PluginGUI *gui;
};

static const char *features[] = {
    CLAP_PLUGIN_FEATURE_INSTRUMENT,
    CLAP_PLUGIN_FEATURE_SYNTHESIZER,
    CLAP_PLUGIN_FEATURE_STEREO,
    NULL,
};

static const clap_plugin_descriptor_t plugin_descriptor = {CLAP_VERSION_INIT,
                                                           "pluto.pgpl.test",
                                                           "PGPL Plugin Test",
                                                           "Patrick_Pluto",
                                                           "",
                                                           "",
                                                           "",
                                                           "1.0.0",
                                                           "Testing",
                                                           features};

static const clap_plugin_note_ports_t note_ports = {
    [](const clap_plugin_t *, bool is_input) -> uint32_t {
      return is_input ? 1 : 0;
    },

    [](const clap_plugin_t *, uint32_t index, bool isInput,
       clap_note_port_info_t *info) -> bool {
      if (!isInput || index)
        return false;
      info->id = 0;
      info->supported_dialects = CLAP_NOTE_DIALECT_CLAP;
      info->preferred_dialect = CLAP_NOTE_DIALECT_CLAP;
      strncpy(info->name, "Note Input", sizeof(info->name));
      return true;
    },
};

static const clap_plugin_audio_ports_t audio_ports = {
    [](const clap_plugin_t *, bool is_input) -> uint32_t {
      return is_input ? 0 : 1;
    },

    [](const clap_plugin_t *, uint32_t index, bool isInput,
       clap_audio_port_info_t *info) -> bool {
      if (isInput || index)
        return false;
      info->id = 0;
      info->channel_count = 2;
      info->flags = CLAP_AUDIO_PORT_IS_MAIN;
      info->port_type = CLAP_PORT_STEREO;
      info->in_place_pair = CLAP_INVALID_ID;
      strncpy(info->name, "Audio Output", sizeof(info->name));
      return true;
    },
};

static const clap_plugin_gui_t gui = {
    [](const clap_plugin_t *, const char *api, bool is_floating) -> bool {
#ifdef __WIN32__
      if (strcmp(api, CLAP_WINDOW_API_WIN32) == 0 && !is_floating) {
#else
      if (strcmp(api, CLAP_WINDOW_API_X11) == 0 && !is_floating) {
#endif
        return true;
      }
      return false;
    },

    [](const clap_plugin_t *, const char **api, bool *is_floating) -> bool {
#ifdef __WIN32__
      *api = CLAP_WINDOW_API_WIN32;
#else
      *api = CLAP_WINDOW_API_X11;
#endif
      *is_floating = false;
      return true;
    },

    [](const clap_plugin_t *plugin, const char *api, bool is_floating) -> bool {
#ifdef __WIN32__
      if (strcmp(api, CLAP_WINDOW_API_WIN32) == 0 && !is_floating) {
#else
      if (strcmp(api, CLAP_WINDOW_API_X11) == 0 && !is_floating) {
#endif
        PluginState *state = (PluginState *)plugin->plugin_data;
        state->create_window();
        return true;
      }
      return false;
    },

    [](const clap_plugin_t *plugin) {
      PluginState *state = (PluginState *)plugin->plugin_data;
      pgpl_window_thread_destroy(state->get_window());
      state->destroy_window();
    },

    [](const clap_plugin_t *plugin, double scale) -> bool {
      PluginState *state = (PluginState *)plugin->plugin_data;
      pgpl_window_thread_set_scale(state->get_window(), scale);
      return true;
    },

    [](const clap_plugin_t *plugin, uint32_t *width, uint32_t *height) -> bool {
      PluginState *state = (PluginState *)plugin->plugin_data;
      pgpl_window_thread_get_size(state->get_window(), width, height);
      return true;
    },

    [](const clap_plugin_t *) -> bool { return true; },

    [](const clap_plugin_t *, clap_gui_resize_hints_t *) -> bool {
      return false;
    },

    [](const clap_plugin_t *, uint32_t *, uint32_t *) -> bool { return true; },

    [](const clap_plugin_t *plugin, uint32_t width, uint32_t height) -> bool {
      PluginState *state = (PluginState *)plugin->plugin_data;
      pgpl_window_thread_set_size(state->get_window(), width, height);
      return true;
    },

    [](const clap_plugin_t *plugin, const clap_window_t *window) -> bool {
      PluginState *state = (PluginState *)plugin->plugin_data;
#ifdef __WIN32__
      pgpl_window_thread_reparent_to(state->get_window(),
                                     (void *)window->win32);
#else
      pgpl_window_thread_reparent_to(state->get_window(), (void *)&window->x11);
#endif
      return true;
    },

    [](const clap_plugin_t *plugin, const clap_window_t *window) -> bool {
      PluginState *state = (PluginState *)plugin->plugin_data;
#ifdef __WIN32__
      pgpl_window_thread_set_transient(state->get_window(),
                                       (void *)window->win32);
#else
      pgpl_window_thread_set_transient(state->get_window(),
                                       (void *)&window->x11);
#endif
      return true;
    },

    [](const clap_plugin_t *plugin, const char *title) {
      PluginState *state = (PluginState *)plugin->plugin_data;
      pgpl_window_thread_set_title(state->get_window(), title);
    },

    [](const clap_plugin_t *plugin) -> bool {
      PluginState *state = (PluginState *)plugin->plugin_data;
      pgpl_window_thread_show(state->get_window());
      return true;
    },

    [](const clap_plugin_t *plugin) -> bool {
      PluginState *state = (PluginState *)plugin->plugin_data;
      pgpl_window_thread_hide(state->get_window());
      return true;
    },
};

static const clap_plugin_t plugin_class = {
    &plugin_descriptor,
    nullptr,
    [](const clap_plugin *) -> bool { return true; },

    [](const clap_plugin *plugin) {
      delete (PluginState *)plugin->plugin_data;
      delete plugin;
    },

    [](const clap_plugin *plugin, double sample_rate, uint32_t,
       uint32_t) -> bool {
      PluginState *state = (PluginState *)plugin->plugin_data;
      state->set_sample_rate(sample_rate);
      return true;
    },

    [](const clap_plugin *) {},

    [](const clap_plugin *) -> bool { return true; },

    [](const clap_plugin *) {},

    [](const clap_plugin *) {},

    [](const clap_plugin *plugin,
       const clap_process_t *process) -> clap_process_status {
      PluginState *state = (PluginState *)plugin->plugin_data;

      uint32_t event_amount = process->in_events->size(process->in_events);
      uint32_t event_index = 0;
      uint32_t next_event_frame = event_amount ? 0 : process->frames_count;

      for (uint32_t i = 0; i < process->frames_count;) {
        while (event_index < event_amount && next_event_frame == i) {
          const clap_event_header_t *event =
              process->in_events->get(process->in_events, event_index);

          if (event->time != i) {
            next_event_frame = event->time;
            break;
          }

          state->process_event(event);
          event_index++;

          if (event_index == event_amount) {
            next_event_frame = process->frames_count;
            break;
          }
        }

        state->render_audio(process->audio_outputs[0].data32[0] + i,
                            process->audio_outputs[0].data32[1] + i,
                            next_event_frame - i);
        i = next_event_frame;
      }

      return CLAP_PROCESS_CONTINUE;
    },

    [](const clap_plugin *, const char *id) -> const void * {
      if (0 == strcmp(id, CLAP_EXT_NOTE_PORTS))
        return &note_ports;
      if (0 == strcmp(id, CLAP_EXT_AUDIO_PORTS))
        return &audio_ports;
      if (0 == strcmp(id, CLAP_EXT_GUI))
        return &gui;
      return nullptr;
    },

    [](const clap_plugin *) {},
};

static const clap_plugin_factory_t plugin_factory = {
    [](const clap_plugin_factory *) -> uint32_t { return 1; },

    [](const clap_plugin_factory *,
       uint32_t index) -> const clap_plugin_descriptor_t * {
      return index == 0 ? &plugin_descriptor : nullptr;
    },

    [](const clap_plugin_factory *, const clap_host_t *host,
       const char *plugin_id) -> const clap_plugin_t * {
      if (!clap_version_is_compatible(host->clap_version) ||
          strcmp(plugin_id, plugin_descriptor.id)) {
        return nullptr;
      }

      clap_plugin_t *plugin = new clap_plugin_t(plugin_class);
      plugin->plugin_data = new PluginState();

      return plugin;
    },
};

extern "C" const clap_plugin_entry_t clap_entry = {
    CLAP_VERSION_INIT,
    [](const char *plugin_path) -> bool {
      pgpl_init();
      srand(time(NULL));
      font_path = new std::string(plugin_path + std::string(".ttf"));
      return true;
    },
    []() {
      delete font_path;
      pgpl_deinit();
    },
    [](const char *factory_id) -> const void * {
      return strcmp(factory_id, CLAP_PLUGIN_FACTORY_ID) ? nullptr
                                                        : &plugin_factory;
    },
};