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SDL_systouchscreen.c
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/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Sam Lantinga
slouken@devolution.com
*/
#include "SDL_config.h"
#ifdef SDL_TOUCHSCREEN_NDS
/* This is the system specific header for the SDL touchscreen API */
#include <nds.h>
#include <stdio.h> /* For the definition of NULL */
#include "SDL_error.h"
#include "SDL_events.h"
#include "SDL_touchscreen.h"
#include "../SDL_systouchscreen.h"
#include "../SDL_touchscreen_c.h"
#include "../../video/nds/SDL_ndsevents_c.h"
/* Function to scan the system for touchscreen.
* This function should set SDL_numtouchscreens to the number of available
* touchscreen. Touchscreen 0 should be the system default touchscreen.
* It should return 0, or -1 on an unrecoverable fatal error.
*/
int
SDL_SYS_TouchscreenInit(void)
{
SDL_numtouchscreens = 1;
return (1);
}
/* Function to get the device-dependent name of a touchscreen */
const char *
SDL_SYS_TouchscreenName(int index)
{
if (!index)
return "NDS builtin touchscreen";
SDL_SetError("No touchscreen available with that index");
return (NULL);
}
/* Function to open a touchscreen for use.
The touchscreen to open is specified by the index field of the touchscreen.
This should fill the maxpoints field of the touchscreen structure.
It returns 0, or -1 if there is an error.
*/
int
SDL_SYS_TouchscreenOpen(SDL_Touchscreen * touchscreen)
{
touchscreen->maxpoints = 1;
touchscreen->npoints = 0;
/* do I call SDL_TouchscreenOpen here? */
return 0;
}
/* Function to update the state of a touchscreen - called as a device poll.
* This function shouldn't update the touchscreen structure directly,
* but instead should call SDL_PrivateTouch*() to deliver events
* and update touchscreen device state.
*/
void
SDL_SYS_TouchscreenUpdate(SDL_Touchscreen * touchscreen)
{
u32 keysd, keysu, keysh;
int xpos, ypos, pressure = 16384;
touchPosition touch;
scanKeys();
keysd = keysDown();
keysh = keysHeld();
keysu = keysUp();
touch=touchReadXY();
xpos = (touch.px-128)*256;
ypos = (touch.py-96)*(65536/192);
if (((keysd|keysh) & KEY_TOUCH)) {
SDL_PrivateTouchPress(touchscreen, 0, xpos, ypos, pressure);
}
if ((keysu & KEY_TOUCH)) {
SDL_PrivateTouchRelease(touchscreen, 0);
}}
/* Function to close a touchscreen after use */
void
SDL_SYS_TouchscreenClose(SDL_Touchscreen * touchscreen)
{
}
/* Function to perform any system-specific touchscreen related cleanup */
void
SDL_SYS_TouchscreenQuit(void)
{
}
#endif /* SDL_TOUCHSCREEN_NDS */