//
// os/x11/gl_window.h: X11/OpenGL window definitions.
//
// CEN64: Cycle-Accurate Nintendo 64 Emulator.
// Copyright (C) 2015, Tyler J. Stachecki.
//
// This file is subject to the terms and conditions defined in
// 'LICENSE', which is part of this source code package.
//

#ifndef CEN64_OS_X11_GL_WINDOW
#define CEN64_OS_X11_GL_WINDOW
#include "common.h"
#include "gl_common.h"
#include "gl_config.h"
#include "gl_display.h"
#include "gl_screen.h"
#include "thread.h"
#include <unistd.h>
#include <X11/Xlib.h>

#define FRAMEBUF_SZ (640 * 474 * 4)
#define CEN64_GL_WINDOW_BAD (NULL)
struct cen64_gl_window {
  cen64_gl_display display;
  cen64_gl_screen screen;

  Window window;
  Atom wm_delete_window;
  XSetWindowAttributes attr;
  XVisualInfo *visual_info;

  int pipefds[2];

  cen64_mutex render_mutex;
  uint8_t frame_buffer[FRAMEBUF_SZ];
  unsigned frame_hres, frame_vres;
  unsigned frame_hskip, frame_type;

  cen64_mutex event_mutex;
  bool exit_requested;
};

typedef struct cen64_gl_window *cen64_gl_window;

// Forward declaration.
struct cen64_device;

// Creates an (initially hidden) cen64_gl_window.
cen64_cold cen64_gl_window cen64_gl_window_create(
  cen64_gl_display display, cen64_gl_screen screen,
  const cen64_gl_config *config, const char *title);

// Releases resources allocated by cen64_gl_window_create.
static inline void cen64_gl_window_destroy(cen64_gl_window window) {
  XDestroyWindow(window->display, window->window);
  XFreeColormap(window->display, window->attr.colormap);
  XFree(window->visual_info);

  close(window->pipefds[0]);
  close(window->pipefds[1]);

  cen64_mutex_destroy(&window->render_mutex);
  cen64_mutex_destroy(&window->event_mutex);
  free(window);
}

// Pushes a notification to the UI queue to indicate a frame is ready.
static inline void cen64_gl_window_push_frame(cen64_gl_window window) {
  write(window->pipefds[1], &window, sizeof(window));
}

// Sets the title of the cen64_gl_window.
static inline void cen64_gl_window_set_title(
  cen64_gl_window window, const char *title) {
  XStoreName(window->display, window->window, title);
  XFlush(window->display);
}

// Swaps the front and back buffers of the cen64_gl_window.
static inline void cen64_gl_window_swap_buffers(cen64_gl_window window) {
  glXSwapBuffers(window->display, window->window);
}

// Thread that controls the user interface, etc.
int cen64_gl_window_thread(struct cen64_device *device);

// Unhides the cen64_gl_window.
static inline void cen64_gl_window_unhide(cen64_gl_window window) {
  XMapRaised(window->display, window->window);
  XFlush(window->display);
}

#endif