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Add SDL_TouchDeviceType enum and SDL_GetTouchDeviceType(SDL_TouchID id).

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Touch device types include SDL_TOUCH_DEVICE_DIRECT (a touch screen with window-relative coordinates for touches), SDL_TOUCH_DEVICE_INDIRECT_ABSOLUTE (a trackpad-style device with absolute device coordinates), and SDL_TOUCH_DEVICE_INDIRECT_RELATIVE (a trackpad-style device with screen cursor-relative coordinates).

Phone screens are an example of a direct device type. Mac trackpads are the indirect-absolute touch device type. The Apple TV remote is an indirect-relative touch device type.
This commit is contained in:
Alex Szpakowski
2018-11-10 16:15:48 -04:00
parent 2196e5765c
commit 5029d50ea8
15 changed files with 109 additions and 15 deletions
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13
include/SDL_touch.h
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@@ -41,6 +41,14 @@ extern "C" {
typedef Sint64 SDL_TouchID;
typedef Sint64 SDL_FingerID;
typedef enum
{
SDL_TOUCH_DEVICE_INVALID = -1,
SDL_TOUCH_DEVICE_DIRECT, /* touch screen with window-relative coordinates */
SDL_TOUCH_DEVICE_INDIRECT_ABSOLUTE, /* trackpad with absolute device coordinates */
SDL_TOUCH_DEVICE_INDIRECT_RELATIVE, /* trackpad with screen cursor-relative coordinates */
} SDL_TouchDeviceType;
typedef struct SDL_Finger
{
SDL_FingerID id;
@@ -65,6 +73,11 @@ extern DECLSPEC int SDLCALL SDL_GetNumTouchDevices(void);
*/
extern DECLSPEC SDL_TouchID SDLCALL SDL_GetTouchDevice(int index);
/**
* \brief Get the type of the given touch device.
*/
extern DECLSPEC SDL_TouchDeviceType SDLCALL SDL_GetTouchDeviceType(SDL_TouchID touchID);
/**
* \brief Get the number of active fingers for a given touch device.
*/