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Vladislav4KZVladislav4KZ
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engine: client: sdl: add support for built-in device gyroscope using SDL2 Sensor API (Android/iOS)
1 parent 84b7b58 commit 9053e61

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Lines changed: 289 additions & 0 deletions

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‎engine/client/in_gyro.c‎

Lines changed: 120 additions & 0 deletions
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@@ -0,0 +1,120 @@
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/*
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in_gyro.c - System gyroscope input code
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Copyright (C) 2026 Xash3D FWGS contributors
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This program is free software: you can redistribute it and/or modify
6+
it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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*/
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#include "common.h"
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#include "input.h"
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#include "client.h"
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static CVAR_DEFINE_AUTO( gyro_enable, "0", FCVAR_ARCHIVE | FCVAR_FILTERABLE, "enables aiming with built-in device gyroscope" );
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static CVAR_DEFINE_AUTO( gyro_available, "0", FCVAR_READ_ONLY, "tells whether system gyroscope hardware is available or not" );
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static CVAR_DEFINE_AUTO( gyro_pitch, "1.0", FCVAR_ARCHIVE | FCVAR_FILTERABLE, "built-in gyroscope sensitivity for looking up and down" );
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static CVAR_DEFINE_AUTO( gyro_yaw, "1.0", FCVAR_ARCHIVE | FCVAR_FILTERABLE, "built-in gyroscope sensitivity for turning left and right" );
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static CVAR_DEFINE_AUTO( gyro_roll, "0.0", FCVAR_ARCHIVE | FCVAR_FILTERABLE, "built-in gyroscope sensitivity when tilting the device sideways" );
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static CVAR_DEFINE_AUTO( gyro_pitch_deadzone, "0.5", FCVAR_ARCHIVE | FCVAR_FILTERABLE, "built-in gyroscope pitch axis deadzone (deg/s)" );
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static CVAR_DEFINE_AUTO( gyro_yaw_deadzone, "0.5", FCVAR_ARCHIVE | FCVAR_FILTERABLE, "built-in gyroscope yaw axis deadzone (deg/s)" );
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static CVAR_DEFINE_AUTO( gyro_roll_deadzone, "0.5", FCVAR_ARCHIVE | FCVAR_FILTERABLE, "built-in gyroscope roll axis deadzone (deg/s)" );
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// stores the latest instantaneous rotation rates from built-in gyroscope
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static vec3_t gyro_speed;
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/*
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==============
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IN_GyroInit
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==============
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*/
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void IN_GyroInit( void )
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{
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Cvar_RegisterVariable( &gyro_enable );
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Cvar_RegisterVariable( &gyro_available );
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Cvar_RegisterVariable( &gyro_pitch );
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Cvar_RegisterVariable( &gyro_yaw );
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Cvar_RegisterVariable( &gyro_roll );
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Cvar_RegisterVariable( &gyro_pitch_deadzone );
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Cvar_RegisterVariable( &gyro_yaw_deadzone );
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Cvar_RegisterVariable( &gyro_roll_deadzone );
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}
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/*
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==============
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IN_GyroCheckAvailability
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One-time late check called after startup and configs
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==============
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*/
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void IN_GyroCheckAvailability( void )
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{
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#if XASH_SDL
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if( gyro_available.value )
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return;
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if( SDLash_GyroIsAvailable() )
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{
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Cvar_FullSet( "gyro_available", "1", FCVAR_READ_ONLY );
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}
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#endif
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}
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/*
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=============
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IN_GyroEvent
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System gyroscope events from platform
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=============
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*/
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void IN_GyroEvent( vec3_t data )
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{
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VectorCopy( data, gyro_speed );
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}
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/*
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=============
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IN_GyroFinalizeMove
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Apply gyro movement to view angles
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=============
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*/
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void IN_GyroFinalizeMove( float *fw, float *side, float *dpitch, float *dyaw )
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{
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platform_orientation_t orient;
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float orient_scale = 1.0f;
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if( !gyro_enable.value || !gyro_available.value )
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return;
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orient = Platform_GetDisplayOrientation();
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if( orient == ORIENTATION_LANDSCAPE_FLIPPED )
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orient_scale = -1.0f;
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// In Landscape mode axes are swapped relative to natural (Portrait) orientation
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// Y axis rotation becomes Pitch (up/down)
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// X axis rotation becomes Yaw (left/right)
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float pitch_speed = orient_scale * gyro_speed[1] * ( 180.0f / M_PI );
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float yaw_speed = -orient_scale * gyro_speed[0] * ( 180.0f / M_PI );
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float roll_speed = orient_scale * gyro_speed[2] * ( 180.0f / M_PI );
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if( fabs( pitch_speed ) < gyro_pitch_deadzone.value )
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pitch_speed = 0.0f;
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if( fabs( yaw_speed ) < gyro_yaw_deadzone.value )
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yaw_speed = 0.0f;
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if( fabs( roll_speed ) < gyro_roll_deadzone.value )
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roll_speed = 0.0f;
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*dpitch -= gyro_pitch.value * pitch_speed * host.realframetime;
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*dyaw += gyro_yaw.value * yaw_speed * host.realframetime;
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*dyaw += gyro_roll.value * roll_speed * host.realframetime;
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VectorClear( gyro_speed );
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}

‎engine/client/input.c‎

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Original file line numberDiff line numberDiff line change
@@ -445,6 +445,8 @@ void IN_Init( void )
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{
446446
IN_StartupMouse( );
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448+
IN_GyroInit();
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448450
Joy_Init(); // common joystick support init
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450452
Touch_Init();
@@ -560,6 +562,7 @@ static void IN_CollectInput( float *forward, float *side, float *pitch, float *y
560562
#endif
561563
}
562564

565+
IN_GyroFinalizeMove( forward, side, pitch, yaw );
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Joy_FinalizeMove( forward, side, pitch, yaw );
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Touch_GetMove( forward, side, pitch, yaw );
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‎engine/client/input.h‎

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Original file line numberDiff line numberDiff line change
@@ -39,6 +39,10 @@ void IN_DeactivateMouse( void );
3939
void IN_MouseSavePos( void );
4040
void IN_MouseRestorePos( void );
4141
void IN_ToggleClientMouse( int newstate, int oldstate );
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void IN_GyroInit( void );
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void IN_GyroCheckAvailability( void );
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void IN_GyroEvent( vec3_t data );
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void IN_GyroFinalizeMove( float *fw, float *side, float *dpitch, float *dyaw );
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4347
uint IN_CollectInputDevices( void );
4448
void IN_LockInputDevices( qboolean lock );

‎engine/common/host.c‎

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Original file line numberDiff line numberDiff line change
@@ -1276,6 +1276,10 @@ int EXPORT Host_Main( int argc, char **argv, const char *progname, int bChangeGa
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Cbuf_ExecStuffCmds(); // execute stuffcmds (commandline)
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SCR_CheckStartupVids(); // must be last
12781278

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#ifndef XASH_DEDICATED
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IN_GyroCheckAvailability();
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#endif
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12791283
if( Sys_GetParmFromCmdLine( "-timedemo", demoname ))
12801284
Cbuf_AddTextf( "timedemo %s\n", demoname );
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‎engine/platform/platform.h‎

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@@ -40,6 +40,17 @@ void Platform_MessageBox( const char *title, const char *message, qboolean paren
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void Platform_SetStatus( const char *status );
4141
qboolean Platform_DebuggerPresent( void );
4242

43+
typedef enum
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{
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ORIENTATION_UNKNOWN = 0,
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ORIENTATION_LANDSCAPE,
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ORIENTATION_LANDSCAPE_FLIPPED,
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ORIENTATION_PORTRAIT,
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ORIENTATION_PORTRAIT_FLIPPED
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} platform_orientation_t;
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platform_orientation_t Platform_GetDisplayOrientation( void );
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4354
// legacy iOS port functions
4455
#if XASH_IOS
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int IOS_GetArgs( char ***argv );
@@ -64,6 +75,7 @@ char *Posix_Input( void );
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void SDLash_Init( void );
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void SDLash_Shutdown( void );
6677
void SDLash_NanoSleep( int nsec );
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qboolean SDLash_GyroIsAvailable( void );
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#endif
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6981
#if XASH_ANDROID

‎engine/platform/sdl2/host_sdl2.c‎

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@@ -368,6 +368,11 @@ static void SDLash_EventHandler( SDL_Event *event )
368368
#endif
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SDLash_HandleGameControllerEvent( event );
370370
break;
371+
#if SDL_VERSION_ATLEAST( 2, 0, 14 )
372+
case SDL_SENSORUPDATE:
373+
SDLash_SensorUpdate( event->sensor );
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break;
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#endif
371376

372377
case SDL_WINDOWEVENT:
373378
if( event->window.windowID != SDL_GetWindowID( host.hWnd ) )

‎engine/platform/sdl2/platform_sdl2.h‎

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@@ -35,5 +35,15 @@ void SDLash_FreeCursors( void );
3535
//
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void SDLash_HandleGameControllerEvent( SDL_Event *ev );
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//
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// sensor_sdl2.c
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//
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void SDLash_InitSensors( void );
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void SDLash_ShutdownSensors( void );
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qboolean SDLash_GyroIsAvailable( void );
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#if SDL_VERSION_ATLEAST( 2, 0, 14 )
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void SDLash_SensorUpdate( SDL_SensorEvent sensor );
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#endif
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3848
#endif // XASH_SDL
3949
#endif // KEYWRAPPER_H

‎engine/platform/sdl2/sensor_sdl2.c‎

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@@ -0,0 +1,103 @@
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/*
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sensor_sdl2.c - SDL2 sensor handling
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Copyright (C) 2026 Xash3D FWGS contributors
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5+
This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
7+
the Free Software Foundation, either version 3 of the License, or
8+
(at your option) any later version.
9+
10+
This program is distributed in the hope that it will be useful,
11+
but WITHOUT ANY WARRANTY; without even the implied warranty of
12+
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13+
GNU General Public License for more details.
14+
*/
15+
16+
#include <SDL.h>
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#include "common.h"
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#include "input.h"
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#include "platform_sdl2.h"
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#if SDL_VERSION_ATLEAST( 2, 0, 14 )
22+
static SDL_SensorID g_system_gyro_id = -1;
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static SDL_Sensor *g_system_gyro;
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/*
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==============
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SDLash_InitSensors
28+
29+
==============
30+
*/
31+
void SDLash_InitSensors( void )
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{
33+
if( SDL_InitSubSystem( SDL_INIT_SENSOR ) == 0 )
34+
{
35+
int num_sensors = SDL_NumSensors();
36+
37+
for( int i = 0; i < num_sensors; i++ )
38+
{
39+
if( SDL_SensorGetDeviceType( i ) == SDL_SENSOR_GYRO )
40+
{
41+
g_system_gyro = SDL_SensorOpen( i );
42+
if( g_system_gyro )
43+
{
44+
g_system_gyro_id = SDL_SensorGetInstanceID( g_system_gyro );
45+
Con_Printf( "SDL: Opened built-in gyroscope: %s\n", SDL_SensorGetName( g_system_gyro ) );
46+
break;
47+
}
48+
}
49+
}
50+
}
51+
else
52+
{
53+
Con_Reportf( S_ERROR "Failed to init SDL Sensor subsystem: %s\n", SDL_GetError() );
54+
}
55+
}
56+
57+
/*
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==============
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SDLash_ShutdownSensors
60+
61+
==============
62+
*/
63+
void SDLash_ShutdownSensors( void )
64+
{
65+
if( g_system_gyro )
66+
{
67+
SDL_SensorClose( g_system_gyro );
68+
g_system_gyro = NULL;
69+
g_system_gyro_id = -1;
70+
}
71+
72+
SDL_QuitSubSystem( SDL_INIT_SENSOR );
73+
}
74+
75+
/*
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==============
77+
SDLash_GyroIsAvailable
78+
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==============
80+
*/
81+
qboolean SDLash_GyroIsAvailable( void )
82+
{
83+
return ( g_system_gyro != NULL );
84+
}
85+
86+
/*
87+
==============
88+
SDLash_SensorUpdate
89+
90+
==============
91+
*/
92+
void SDLash_SensorUpdate( SDL_SensorEvent sensor )
93+
{
94+
if( sensor.which == g_system_gyro_id )
95+
{
96+
IN_GyroEvent( sensor.data );
97+
}
98+
}
99+
#else
100+
void SDLash_InitSensors( void ) { }
101+
void SDLash_ShutdownSensors( void ) { }
102+
qboolean SDLash_GyroIsAvailable( void ) { return false; }
103+
#endif

‎engine/platform/sdl2/sys_sdl2.c‎

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@@ -146,10 +146,12 @@ void SDLash_Init( void )
146146
SDL_StopTextInput();
147147

148148
SDLash_InitCursors();
149+
SDLash_InitSensors();
149150
}
150151

151152
void SDLash_Shutdown( void )
152153
{
154+
SDLash_ShutdownSensors();
153155
SDLash_FreeCursors();
154156

155157
SDL_Quit();

‎engine/platform/sdl2/vid_sdl2.c‎

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Original file line numberDiff line numberDiff line change
@@ -1204,3 +1204,29 @@ void VID_Info_f( void )
12041204
else
12051205
Con_Printf( "Window display mode: " S_RED "fail: " S_DEFAULT "%s\n", SDL_GetError( ));
12061206
}
1207+
1208+
platform_orientation_t Platform_GetDisplayOrientation( void )
1209+
{
1210+
if( host.hWnd )
1211+
{
1212+
int display_index = SDL_GetWindowDisplayIndex( host.hWnd );
1213+
if( display_index >= 0 )
1214+
{
1215+
switch( SDL_GetDisplayOrientation( display_index ) )
1216+
{
1217+
case SDL_ORIENTATION_LANDSCAPE:
1218+
return ORIENTATION_LANDSCAPE;
1219+
case SDL_ORIENTATION_LANDSCAPE_FLIPPED:
1220+
return ORIENTATION_LANDSCAPE_FLIPPED;
1221+
case SDL_ORIENTATION_PORTRAIT:
1222+
return ORIENTATION_PORTRAIT;
1223+
case SDL_ORIENTATION_PORTRAIT_FLIPPED:
1224+
return ORIENTATION_PORTRAIT_FLIPPED;
1225+
default:
1226+
return ORIENTATION_UNKNOWN;
1227+
}
1228+
}
1229+
}
1230+
1231+
return ORIENTATION_UNKNOWN;
1232+
}

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