rntviewer/src/rntviewer.cpp

#include <ROOT/RNTupleReader.hxx>
#include <ROOT/RNTuple.hxx>
#include <TFile.h>

#include <cstdio>
#include <cstdint>
#include <chrono>

#ifdef DEBUG
#include <sanitizer/asan_interface.h>
#endif

#include <imgui/imgui.h>
#include <imgui/backends/imgui_impl_glfw.h>
#include <imgui/backends/imgui_impl_opengl3.h>
#include <imgui_club/imgui_memory_editor.h>

#define GLFW_INCLUDE_NONE
#include <GLFW/glfw3.h>

#include "PseudoMiniFile.hxx"

#include "types.h"
#include "defer.hpp"
#include "mem.h"
#include "str.h"
#include "rntuple.h"
#include "window.h"
#include "render.h"
#include "app_state.h"

// @Platform
#include "platform_linux.h"

namespace chr = std::chrono;

#include "mem.cpp"
#include "str.cpp"
#include "rntuple.cpp"
#include "render.cpp"
#include "mainloop.cpp"

using namespace ROOT::Experimental;

internal 
b8 init_imgui(GLFWwindow* window) {
	IMGUI_CHECKVERSION();
	ImGui::CreateContext();
	ImGuiIO& io = ImGui::GetIO(); (void) io;
	io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;

	ImGui::StyleColorsDark();

	ImGui_ImplGlfw_InitForOpenGL(window, true);
	ImGui_ImplOpenGL3_Init("#version 400");

	return true;
}

internal
void app_cleanup(App_State &app)
{
  os_stop_file_watch(app);
  os_unmap_file(app.inspected_fmem, app.inspected_file_size);
  if (app.inspected_file) fclose(app.inspected_file); 
}

int main(int argc, char **argv)
{
  if (argc > 1 && argv[1][0] == '-') {
    fprintf(stderr, "Usage: %s <ntuple_name> <ntuple_file.root>\n", argv[0]);
    return 1;
  }

  // Collect arguments
  const char *ntpl_name = argc > 1 ? argv[1] : nullptr;
  const char *fname = argc > 2 ? argv[2] : nullptr;

  // Allocate program memory
  Arena *arena = arena_alloc();
  if (!arena) {
    fprintf(stderr, "Failed to allocate memory\n");
    return 1;
  }
  defer { arena_release(arena); };

  // Init imgui and GLFW
  GLFWwindow *window = init_glfw(800, 600);
  if (!window) {
    fprintf(stderr, "Failed to init GLFW\n");
    return 1;
  }
  defer { glfwTerminate(); };
  
  if (!init_imgui(window)) {
    fprintf(stderr, "Failed to init Imgui\n");
    return 1;
  }

  App_State app {};
  defer { app_cleanup(app); };

  // Open and map the file
  if (fname) {
    os_open_and_map_file(fname, app);
    
    // Watch file for changes (to adapt the displayed file size - otherwise
    // we may try to access invalid memory when the file gets shrunk)
    os_start_file_watch(fname, app);
  }

  app.ntpl_name = ntpl_name;
  app.rntinfo = get_rntuple_info(fname, ntpl_name);
  app.vsettings = make_viewer_settings();
  
  // Start main loop
  run_main_loop(window, arena, app);

  return 0;
}