mirror of https://github.com/libsdl-org/SDL
139 lines
4.7 KiB
C
139 lines
4.7 KiB
C
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2024 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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/**
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* # CategoryTouch
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*
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* SDL touch management.
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*/
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#ifndef SDL_touch_h_
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#define SDL_touch_h_
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#include <SDL3/SDL_stdinc.h>
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#include <SDL3/SDL_error.h>
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#include <SDL3/SDL_mouse.h>
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#include <SDL3/SDL_video.h>
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#include <SDL3/SDL_begin_code.h>
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/* Set up for C function definitions, even when using C++ */
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef Uint64 SDL_TouchID;
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typedef Uint64 SDL_FingerID;
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typedef enum SDL_TouchDeviceType
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{
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SDL_TOUCH_DEVICE_INVALID = -1,
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SDL_TOUCH_DEVICE_DIRECT, /* touch screen with window-relative coordinates */
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SDL_TOUCH_DEVICE_INDIRECT_ABSOLUTE, /* trackpad with absolute device coordinates */
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SDL_TOUCH_DEVICE_INDIRECT_RELATIVE /* trackpad with screen cursor-relative coordinates */
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} SDL_TouchDeviceType;
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/**
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* Data about a single finger in a multitouch event.
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*
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* Each touch even is a collection of fingers that are simultaneously in
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* contact with the touch device (so a "touch" can be a "multitouch," in
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* reality), and this struct reports details of the specific fingers.
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*
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* \since This struct is available since SDL 3.0.0.
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*
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* \sa SDL_GetTouchFingers
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*/
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typedef struct SDL_Finger
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{
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SDL_FingerID id; /**< the finger ID */
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float x; /**< the x-axis location of the touch event, normalized (0...1) */
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float y; /**< the y-axis location of the touch event, normalized (0...1) */
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float pressure; /**< the quantity of pressure applied, normalized (0...1) */
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} SDL_Finger;
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/* Used as the device ID for mouse events simulated with touch input */
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#define SDL_TOUCH_MOUSEID ((SDL_MouseID)-1)
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/* Used as the SDL_TouchID for touch events simulated with mouse input */
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#define SDL_MOUSE_TOUCHID ((SDL_TouchID)-1)
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/**
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* Get a list of registered touch devices.
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*
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* On some platforms SDL first sees the touch device if it was actually used.
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* Therefore the returned list might be empty, although devices are available.
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* After using all devices at least once the number will be correct.
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*
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* \param count a pointer filled in with the number of devices returned, may
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* be NULL.
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* \returns a 0 terminated array of touch device IDs or NULL on failure; call
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* SDL_GetError() for more information. This should be freed with
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* SDL_free() when it is no longer needed.
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*
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* \since This function is available since SDL 3.0.0.
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*/
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extern SDL_DECLSPEC SDL_TouchID * SDLCALL SDL_GetTouchDevices(int *count);
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/**
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* Get the touch device name as reported from the driver.
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*
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* \param touchID the touch device instance ID.
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* \returns touch device name, or NULL on failure; call SDL_GetError() for
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* more information.
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*
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* \since This function is available since SDL 3.0.0.
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*/
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extern SDL_DECLSPEC const char * SDLCALL SDL_GetTouchDeviceName(SDL_TouchID touchID);
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/**
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* Get the type of the given touch device.
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*
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* \param touchID the ID of a touch device.
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* \returns touch device type.
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*
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* \since This function is available since SDL 3.0.0.
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*/
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extern SDL_DECLSPEC SDL_TouchDeviceType SDLCALL SDL_GetTouchDeviceType(SDL_TouchID touchID);
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/**
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* Get a list of active fingers for a given touch device.
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*
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* \param touchID the ID of a touch device.
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* \param count a pointer filled in with the number of fingers returned, can
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* be NULL.
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* \returns a NULL terminated array of SDL_Finger pointers or NULL on failure;
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* call SDL_GetError() for more information. This is a single
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* allocation that should be freed with SDL_free() when it is no
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* longer needed.
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*
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* \since This function is available since SDL 3.0.0.
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*/
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extern SDL_DECLSPEC SDL_Finger ** SDLCALL SDL_GetTouchFingers(SDL_TouchID touchID, int *count);
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/* Ends C function definitions when using C++ */
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#ifdef __cplusplus
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}
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#endif
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#include <SDL3/SDL_close_code.h>
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#endif /* SDL_touch_h_ */
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