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SDL - added new SDL_JoystickCurrentPowerLevel() API that returns the …

…battery level of the selected joystick. Currently only implemented for XInput devices, other platforms are a TODO.

CR: Sam
  • Loading branch information
slouken committed Sep 30, 2015
1 parent c2f0394 commit a0c4b56ff94d3ed11b7adb1ee6bbc4594210b4b6
@@ -71,6 +71,16 @@ typedef struct {

typedef Sint32 SDL_JoystickID;

typedef enum
{
SDL_JOYSTICK_POWER_UNKNOWN = -1,
SDL_JOYSTICK_POWER_EMPTY,
SDL_JOYSTICK_POWER_LOW,
SDL_JOYSTICK_POWER_MEDIUM,
SDL_JOYSTICK_POWER_FULL,
SDL_JOYSTICK_POWER_WIRED,
SDL_JOYSTICK_POWER_MAX
} SDL_JoystickPowerLevel;

/* Function prototypes */
/**
@@ -242,6 +252,11 @@ extern DECLSPEC Uint8 SDLCALL SDL_JoystickGetButton(SDL_Joystick * joystick,
*/
extern DECLSPEC void SDLCALL SDL_JoystickClose(SDL_Joystick * joystick);

/**
* Return the battery level of this joystick
*/
extern DECLSPEC SDL_JoystickPowerLevel SDLCALL SDL_JoystickCurrentPowerLevel(SDL_Joystick * joystick);


/* Ends C function definitions when using C++ */
#ifdef __cplusplus
@@ -29,6 +29,7 @@
XInputGetState_t SDL_XInputGetState = NULL;
XInputSetState_t SDL_XInputSetState = NULL;
XInputGetCapabilities_t SDL_XInputGetCapabilities = NULL;
XInputGetBatteryInformation_t SDL_XInputGetBatteryInformation = NULL;
DWORD SDL_XInputVersion = 0;

static HANDLE s_pXInputDLL = 0;
@@ -55,6 +56,7 @@ WIN_LoadXInputDLL(void)
SDL_XInputGetState = (XInputGetState_t)XInputGetState;
SDL_XInputSetState = (XInputSetState_t)XInputSetState;
SDL_XInputGetCapabilities = (XInputGetCapabilities_t)XInputGetCapabilities;
SDL_XInputGetBatteryInformation = (XInputGetBatteryInformation_t)XInputGetBatteryInformation;

/* XInput 1.4 ships with Windows 8 and 8.1: */
SDL_XInputVersion = (1 << 16) | 4;
@@ -108,6 +110,7 @@ WIN_LoadXInputDLL(void)
}
SDL_XInputSetState = (XInputSetState_t)GetProcAddress((HMODULE)s_pXInputDLL, "XInputSetState");
SDL_XInputGetCapabilities = (XInputGetCapabilities_t)GetProcAddress((HMODULE)s_pXInputDLL, "XInputGetCapabilities");
SDL_XInputGetBatteryInformation = (XInputGetBatteryInformation_t)GetProcAddress( (HMODULE)s_pXInputDLL, "XInputGetBatteryInformation" );
if (!SDL_XInputGetState || !SDL_XInputSetState || !SDL_XInputGetCapabilities) {
WIN_UnloadXInputDLL();
return -1;
@@ -76,6 +76,29 @@
#define XINPUT_GAMEPAD_GUIDE 0x0400
#endif

#ifndef BATTERY_DEVTYPE_GAMEPAD
#define BATTERY_DEVTYPE_GAMEPAD 0x00
#endif
#ifndef BATTERY_TYPE_WIRED
#define BATTERY_TYPE_WIRED 0x01
#endif

#ifndef BATTERY_TYPE_UNKNOWN
#define BATTERY_TYPE_UNKNOWN 0xFF
#endif
#ifndef BATTERY_LEVEL_EMPTY
#define BATTERY_LEVEL_EMPTY 0x00
#endif
#ifndef BATTERY_LEVEL_LOW
#define BATTERY_LEVEL_LOW 0x01
#endif
#ifndef BATTERY_LEVEL_MEDIUM
#define BATTERY_LEVEL_MEDIUM 0x02
#endif
#ifndef BATTERY_LEVEL_FULL
#define BATTERY_LEVEL_FULL 0x03
#endif

/* typedef's for XInput structs we use */
typedef struct
{
@@ -95,6 +118,12 @@ typedef struct
XINPUT_GAMEPAD_EX Gamepad;
} XINPUT_STATE_EX;

typedef struct _XINPUT_BATTERY_INFORMATION
{
BYTE BatteryType;
BYTE BatteryLevel;
} XINPUT_BATTERY_INFORMATION, *PXINPUT_BATTERY_INFORMATION;

/* Forward decl's for XInput API's we load dynamically and use if available */
typedef DWORD (WINAPI *XInputGetState_t)
(
@@ -115,17 +144,26 @@ typedef DWORD (WINAPI *XInputGetCapabilities_t)
XINPUT_CAPABILITIES* pCapabilities /* [out] Receives the capabilities */
);

typedef DWORD (WINAPI *XInputGetBatteryInformation_t)
(
_In_ DWORD dwUserIndex,
_In_ BYTE devType,
_Out_ XINPUT_BATTERY_INFORMATION *pBatteryInformation
);

extern int WIN_LoadXInputDLL(void);
extern void WIN_UnloadXInputDLL(void);

extern XInputGetState_t SDL_XInputGetState;
extern XInputSetState_t SDL_XInputSetState;
extern XInputGetCapabilities_t SDL_XInputGetCapabilities;
extern XInputGetBatteryInformation_t SDL_XInputGetBatteryInformation;
extern DWORD SDL_XInputVersion; /* ((major << 16) & 0xFF00) | (minor & 0xFF) */

#define XINPUTGETSTATE SDL_XInputGetState
#define XINPUTSETSTATE SDL_XInputSetState
#define XINPUTGETCAPABILITIES SDL_XInputGetCapabilities
#define XINPUTGETBATTERYINFORMATION SDL_XInputGetBatteryInformation

#endif /* HAVE_XINPUT_H */

@@ -178,6 +178,7 @@ SDL_JoystickOpen(int device_index)
if (joystick->buttons) {
SDL_memset(joystick->buttons, 0, joystick->nbuttons * sizeof(Uint8));
}
joystick->epowerlevel = SDL_JOYSTICK_POWER_UNKNOWN;

/* Add joystick to list */
++joystick->ref_count;
@@ -619,10 +620,10 @@ SDL_PrivateJoystickButton(SDL_Joystick * joystick, Uint8 button, Uint8 state)
/* Make sure we're not getting garbage or duplicate events */
if (button >= joystick->nbuttons) {
return 0;
}
if (state == joystick->buttons[button]) {
return 0;
}
}
if (state == joystick->buttons[button]) {
return 0;
}

/* We ignore events if we don't have keyboard focus, except for button
* release. */
@@ -825,4 +826,21 @@ SDL_JoystickGUID SDL_JoystickGetGUIDFromString(const char *pchGUID)
}


/* update the power level for this joystick */
void SDL_PrivateJoystickBatteryLevel(SDL_Joystick * joystick, SDL_JoystickPowerLevel ePowerLevel)
{
joystick->epowerlevel = ePowerLevel;
}


/* return its power level */
SDL_JoystickPowerLevel SDL_JoystickCurrentPowerLevel(SDL_Joystick * joystick)
{
if (!SDL_PrivateJoystickValid(joystick)) {
return (SDL_JOYSTICK_POWER_UNKNOWN);
}
return joystick->epowerlevel;
}


/* vi: set ts=4 sw=4 expandtab: */
@@ -41,6 +41,8 @@ extern int SDL_PrivateJoystickHat(SDL_Joystick * joystick,
Uint8 hat, Uint8 value);
extern int SDL_PrivateJoystickButton(SDL_Joystick * joystick,
Uint8 button, Uint8 state);
extern void SDL_PrivateJoystickBatteryLevel( SDL_Joystick * joystick,
SDL_JoystickPowerLevel ePowerLevel );

/* Internal sanity checking functions */
extern int SDL_PrivateJoystickValid(SDL_Joystick * joystick);
@@ -54,6 +54,7 @@ struct _SDL_Joystick
int ref_count; /* Reference count for multiple opens */

SDL_bool force_recentering; /* SDL_TRUE if this device needs to have its state reset to 0 */
SDL_JoystickPowerLevel epowerlevel; /* power level of this joystick, SDL_JOYSTICK_POWER_UNKNOWN if not supported */
struct _SDL_Joystick *next; /* pointer to next joystick we have allocated */
};

@@ -221,8 +221,39 @@ SDL_XINPUT_JoystickOpen(SDL_Joystick * joystick, JoyStick_DeviceData *joystickde
return 0;
}

static void
UpdateXInputJoystickBatteryInformation(SDL_Joystick * joystick, XINPUT_BATTERY_INFORMATION *pBatteryInformation)
{
if ( pBatteryInformation->BatteryType != BATTERY_TYPE_UNKNOWN )
{
SDL_JoystickPowerLevel ePowerLevel = SDL_JOYSTICK_POWER_UNKNOWN;
if (pBatteryInformation->BatteryType == BATTERY_TYPE_WIRED) {
ePowerLevel = SDL_JOYSTICK_POWER_WIRED;
} else {
switch ( pBatteryInformation->BatteryLevel )
{
case BATTERY_LEVEL_EMPTY:
ePowerLevel = SDL_JOYSTICK_POWER_EMPTY;
break;
case BATTERY_LEVEL_LOW:
ePowerLevel = SDL_JOYSTICK_POWER_LOW;
break;
case BATTERY_LEVEL_MEDIUM:
ePowerLevel = SDL_JOYSTICK_POWER_MEDIUM;
break;
default:
case BATTERY_LEVEL_FULL:
ePowerLevel = SDL_JOYSTICK_POWER_FULL;
break;
}
}

SDL_PrivateJoystickBatteryLevel( joystick, ePowerLevel );
}
}

static void
UpdateXInputJoystickState_OLD(SDL_Joystick * joystick, XINPUT_STATE_EX *pXInputState)
UpdateXInputJoystickState_OLD(SDL_Joystick * joystick, XINPUT_STATE_EX *pXInputState, XINPUT_BATTERY_INFORMATION *pBatteryInformation)
{
static WORD s_XInputButtons[] = {
XINPUT_GAMEPAD_DPAD_UP, XINPUT_GAMEPAD_DPAD_DOWN, XINPUT_GAMEPAD_DPAD_LEFT, XINPUT_GAMEPAD_DPAD_RIGHT,
@@ -244,10 +275,12 @@ UpdateXInputJoystickState_OLD(SDL_Joystick * joystick, XINPUT_STATE_EX *pXInputS
for (button = 0; button < SDL_arraysize(s_XInputButtons); ++button) {
SDL_PrivateJoystickButton(joystick, button, (wButtons & s_XInputButtons[button]) ? SDL_PRESSED : SDL_RELEASED);
}

UpdateXInputJoystickBatteryInformation( joystick, pBatteryInformation );
}

static void
UpdateXInputJoystickState(SDL_Joystick * joystick, XINPUT_STATE_EX *pXInputState)
UpdateXInputJoystickState(SDL_Joystick * joystick, XINPUT_STATE_EX *pXInputState, XINPUT_BATTERY_INFORMATION *pBatteryInformation)
{
static WORD s_XInputButtons[] = {
XINPUT_GAMEPAD_A, XINPUT_GAMEPAD_B, XINPUT_GAMEPAD_X, XINPUT_GAMEPAD_Y,
@@ -283,13 +316,16 @@ UpdateXInputJoystickState(SDL_Joystick * joystick, XINPUT_STATE_EX *pXInputState
hat |= SDL_HAT_RIGHT;
}
SDL_PrivateJoystickHat(joystick, 0, hat);

UpdateXInputJoystickBatteryInformation( joystick, pBatteryInformation );
}

void
SDL_XINPUT_JoystickUpdate(SDL_Joystick * joystick)
{
HRESULT result;
XINPUT_STATE_EX XInputState;
XINPUT_BATTERY_INFORMATION XBatteryInformation;

if (!XINPUTGETSTATE)
return;
@@ -301,12 +337,18 @@ SDL_XINPUT_JoystickUpdate(SDL_Joystick * joystick)
return;
}

SDL_zero( XBatteryInformation );
if ( XINPUTGETBATTERYINFORMATION )
{
result = XINPUTGETBATTERYINFORMATION( joystick->hwdata->userid, BATTERY_DEVTYPE_GAMEPAD, &XBatteryInformation );
}

/* only fire events if the data changed from last time */
if (XInputState.dwPacketNumber && XInputState.dwPacketNumber != joystick->hwdata->dwPacketNumber) {
if (SDL_XInputUseOldJoystickMapping()) {
UpdateXInputJoystickState_OLD(joystick, &XInputState);
UpdateXInputJoystickState_OLD(joystick, &XInputState, &XBatteryInformation);
} else {
UpdateXInputJoystickState(joystick, &XInputState);
UpdateXInputJoystickState(joystick, &XInputState, &XBatteryInformation);
}
joystick->hwdata->dwPacketNumber = XInputState.dwPacketNumber;
}

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