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virtualx-engine/platform/x11/os_x11.h
Cosmic Chip Socket cf124b1415 Use XInput2 RawMotion to generate MouseMotion events 
The current system for capturing the mouse and generating motion events on X11
has issues with inaccurate and lopsided input. This is because both
XQueryPointer and XWarpPointer work in terms of integer coordinates when the
underlying X11 input driver may be tracking the mouse using subpixel
coordinates. When warping the pointer, the fractional part of the pointer
position is discarded.

To work around this issue, the fix uses raw motion events from XInput 2. These
events report relative motion and are not affected by pointer warping.
Additionally, this means Godot is able to detect motion at a higher resolution
under X11. Because this is raw mouse input, it is not affected by the user's
pointer speed and acceleration settings. This is the same system as SDL2 uses
for its relative motion.

Multitouch input on X requires XInput 2.2. Raw motion events require
XInput 2.0. Since 2.0 is old enough, this is now the minimum requirement to
use Godot on X.
2018-12-14 23:51:20 +01:00

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/*************************************************************************/
/* os_x11.h */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2018 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2018 Godot Engine contributors (cf. AUTHORS.md) */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#ifndef OS_X11_H
#define OS_X11_H
#include "context_gl_x11.h"
#include "core/os/input.h"
#include "crash_handler_x11.h"
#include "drivers/alsa/audio_driver_alsa.h"
#include "drivers/alsamidi/alsa_midi.h"
#include "drivers/pulseaudio/audio_driver_pulseaudio.h"
#include "drivers/unix/os_unix.h"
#include "joypad_linux.h"
#include "main/input_default.h"
#include "power_x11.h"
#include "servers/audio_server.h"
#include "servers/visual/rasterizer.h"
#include "servers/visual_server.h"
//#include "servers/visual/visual_server_wrap_mt.h"
#include <X11/Xcursor/Xcursor.h>
#include <X11/Xlib.h>
#include <X11/extensions/XInput2.h>
#include <X11/extensions/Xrandr.h>
#include <X11/keysym.h>
// Hints for X11 fullscreen
typedef struct {
unsigned long flags;
unsigned long functions;
unsigned long decorations;
long inputMode;
unsigned long status;
} Hints;
typedef struct _xrr_monitor_info {
Atom name;
Bool primary;
Bool automatic;
int noutput;
int x;
int y;
int width;
int height;
int mwidth;
int mheight;
RROutput *outputs;
} xrr_monitor_info;
#undef CursorShape
/**
@author Juan Linietsky <reduzio@gmail.com>
*/
class OS_X11 : public OS_Unix {
Atom wm_delete;
Atom xdnd_enter;
Atom xdnd_position;
Atom xdnd_status;
Atom xdnd_action_copy;
Atom xdnd_drop;
Atom xdnd_finished;
Atom xdnd_selection;
Atom requested;
int xdnd_version;
#if defined(OPENGL_ENABLED)
ContextGL_X11 *context_gl;
#endif
//Rasterizer *rasterizer;
VisualServer *visual_server;
VideoMode current_videomode;
List<String> args;
Window x11_window;
Window xdnd_source_window;
MainLoop *main_loop;
::Display *x11_display;
char *xmbstring;
int xmblen;
unsigned long last_timestamp;
::Time last_keyrelease_time;
::XIC xic;
::XIM xim;
::XIMStyle xim_style;
static void xim_destroy_callback(::XIM im, ::XPointer client_data,
::XPointer call_data);
// IME
bool im_active;
Vector2 im_position;
Point2 last_mouse_pos;
bool last_mouse_pos_valid;
Point2i last_click_pos;
uint64_t last_click_ms;
int last_click_button_index;
uint32_t last_button_state;
struct {
int opcode;
Vector<int> touch_devices;
Map<int, Vector2> absolute_devices;
XIEventMask all_event_mask;
XIEventMask all_master_event_mask;
Map<int, Vector2> state;
Vector2 mouse_pos_to_filter;
Vector2 relative_motion;
Vector2 raw_pos;
Vector2 old_raw_pos;
::Time last_relative_time;
} xi;
bool refresh_device_info();
unsigned int get_mouse_button_state(unsigned int p_x11_button, int p_x11_type);
void get_key_modifier_state(unsigned int p_x11_state, Ref<InputEventWithModifiers> state);
void flush_mouse_motion();
MouseMode mouse_mode;
Point2i center;
void handle_key_event(XKeyEvent *p_event, bool p_echo = false);
void process_xevents();
virtual void delete_main_loop();
bool force_quit;
bool minimized;
bool window_has_focus;
bool do_mouse_warp;
const char *cursor_theme;
int cursor_size;
XcursorImage *img[CURSOR_MAX];
Cursor cursors[CURSOR_MAX];
Cursor null_cursor;
CursorShape current_cursor;
InputDefault *input;
#ifdef JOYDEV_ENABLED
JoypadLinux *joypad;
#endif
#ifdef ALSA_ENABLED
AudioDriverALSA driver_alsa;
#endif
#ifdef ALSAMIDI_ENABLED
MIDIDriverALSAMidi driver_alsamidi;
#endif
#ifdef PULSEAUDIO_ENABLED
AudioDriverPulseAudio driver_pulseaudio;
#endif
PowerX11 *power_manager;
bool layered_window;
CrashHandler crash_handler;
int video_driver_index;
bool maximized;
//void set_wm_border(bool p_enabled);
void set_wm_fullscreen(bool p_enabled);
void set_wm_above(bool p_enabled);
typedef xrr_monitor_info *(*xrr_get_monitors_t)(Display *dpy, Window window, Bool get_active, int *nmonitors);
typedef void (*xrr_free_monitors_t)(xrr_monitor_info *monitors);
xrr_get_monitors_t xrr_get_monitors;
xrr_free_monitors_t xrr_free_monitors;
void *xrandr_handle;
Bool xrandr_ext_ok;
protected:
virtual int get_current_video_driver() const;
virtual void initialize_core();
virtual Error initialize(const VideoMode &p_desired, int p_video_driver, int p_audio_driver);
virtual void finalize();
virtual void set_main_loop(MainLoop *p_main_loop);
void _window_changed(XEvent *event);
bool is_window_maximize_allowed();
public:
virtual String get_name();
virtual void set_cursor_shape(CursorShape p_shape);
virtual void set_custom_mouse_cursor(const RES &p_cursor, CursorShape p_shape, const Vector2 &p_hotspot);
void set_mouse_mode(MouseMode p_mode);
MouseMode get_mouse_mode() const;
virtual void warp_mouse_position(const Point2 &p_to);
virtual Point2 get_mouse_position() const;
virtual int get_mouse_button_state() const;
virtual void set_window_title(const String &p_title);
virtual void set_icon(const Ref<Image> &p_icon);
virtual MainLoop *get_main_loop() const;
virtual bool can_draw() const;
virtual void set_clipboard(const String &p_text);
virtual String get_clipboard() const;
virtual void release_rendering_thread();
virtual void make_rendering_thread();
virtual void swap_buffers();
virtual String get_config_path() const;
virtual String get_data_path() const;
virtual String get_cache_path() const;
virtual String get_system_dir(SystemDir p_dir) const;
virtual Error shell_open(String p_uri);
virtual void set_video_mode(const VideoMode &p_video_mode, int p_screen = 0);
virtual VideoMode get_video_mode(int p_screen = 0) const;
virtual void get_fullscreen_mode_list(List<VideoMode> *p_list, int p_screen = 0) const;
virtual int get_screen_count() const;
virtual int get_current_screen() const;
virtual void set_current_screen(int p_screen);
virtual Point2 get_screen_position(int p_screen = -1) const;
virtual Size2 get_screen_size(int p_screen = -1) const;
virtual int get_screen_dpi(int p_screen = -1) const;
virtual Point2 get_window_position() const;
virtual void set_window_position(const Point2 &p_position);
virtual Size2 get_window_size() const;
virtual Size2 get_real_window_size() const;
virtual void set_window_size(const Size2 p_size);
virtual void set_window_fullscreen(bool p_enabled);
virtual bool is_window_fullscreen() const;
virtual void set_window_resizable(bool p_enabled);
virtual bool is_window_resizable() const;
virtual void set_window_minimized(bool p_enabled);
virtual bool is_window_minimized() const;
virtual void set_window_maximized(bool p_enabled);
virtual bool is_window_maximized() const;
virtual void set_window_always_on_top(bool p_enabled);
virtual bool is_window_always_on_top() const;
virtual void request_attention();
virtual void set_borderless_window(bool p_borderless);
virtual bool get_borderless_window();
virtual bool get_window_per_pixel_transparency_enabled() const;
virtual void set_window_per_pixel_transparency_enabled(bool p_enabled);
virtual void set_ime_active(const bool p_active);
virtual void set_ime_position(const Point2 &p_pos);
virtual String get_unique_id() const;
virtual void move_window_to_foreground();
virtual void alert(const String &p_alert, const String &p_title = "ALERT!");
virtual bool is_joy_known(int p_device);
virtual String get_joy_guid(int p_device) const;
virtual void set_context(int p_context);
virtual void _set_use_vsync(bool p_enable);
//virtual bool is_vsync_enabled() const;
virtual OS::PowerState get_power_state();
virtual int get_power_seconds_left();
virtual int get_power_percent_left();
virtual bool _check_internal_feature_support(const String &p_feature);
virtual void force_process_input();
void run();
void disable_crash_handler();
bool is_disable_crash_handler() const;
virtual Error move_to_trash(const String &p_path);
virtual LatinKeyboardVariant get_latin_keyboard_variant() const;
void update_real_mouse_position();
OS_X11();
};
#endif
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