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annotate src/touchscreen/nds/SDL_systouchscreen.c @ 2676:082cc3ffd7d8 gsoc2008_nds

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Fixed a conflict between the touch and joystick drivers. They now should both behave as expected.
author Darren Alton <dalton@stevens.edu>
date Tue, 01 Jul 2008 13:02:50 +0000
parents 5e4274591163
children
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@devolution.com
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21 */
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22
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23 #include "SDL_config.h"
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24
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25 #ifdef SDL_TOUCHSCREEN_NDS
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26
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27 /* This is the system specific header for the SDL touchscreen API */
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28 #include <nds.h>
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29 #include <stdio.h> /* For the definition of NULL */
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30
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31 #include "SDL_error.h"
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32 #include "SDL_events.h"
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33 #include "SDL_touchscreen.h"
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34 #include "../SDL_systouchscreen.h"
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35 #include "../SDL_touchscreen_c.h"
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36
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37 #include "../../video/nds/SDL_ndsevents_c.h"
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38
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39 /* Function to scan the system for touchscreen.
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40 * This function should set SDL_numtouchscreens to the number of available
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41 * touchscreen. Touchscreen 0 should be the system default touchscreen.
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42 * It should return 0, or -1 on an unrecoverable fatal error.
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43 */
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44 int
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45 SDL_SYS_TouchscreenInit(void)
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46 {
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47 SDL_numtouchscreens = 1;
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48 return (1);
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49 }
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50
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51 /* Function to get the device-dependent name of a touchscreen */
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52 const char *
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53 SDL_SYS_TouchscreenName(int index)
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54 {
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55 if (!index)
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56 return "NDS builtin touchscreen";
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57 SDL_SetError("No touchscreen available with that index");
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58 return (NULL);
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59 }
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60
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61 /* Function to open a touchscreen for use.
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62 The touchscreen to open is specified by the index field of the touchscreen.
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63 This should fill the maxpoints field of the touchscreen structure.
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64 It returns 0, or -1 if there is an error.
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65 */
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66 int
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67 SDL_SYS_TouchscreenOpen(SDL_Touchscreen * touchscreen)
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68 {
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69 touchscreen->maxpoints = 1;
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70 touchscreen->npoints = 0;
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71 /* do I call SDL_TouchscreenOpen here? */
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72 return 0;
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73 }
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74
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75
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76 /* Function to update the state of a touchscreen - called as a device poll.
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77 * This function shouldn't update the touchscreen structure directly,
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78 * but instead should call SDL_PrivateTouch*() to deliver events
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79 * and update touchscreen device state.
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80 */
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81 void
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82 SDL_SYS_TouchscreenUpdate(SDL_Touchscreen * touchscreen)
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83 {
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84 u32 keysd, keysu, keysh;
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85 Uint16 xpos=0, ypos=0, pressure = 32767;
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86 touchPosition touch;
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87
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88 /*scanKeys();*/
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89 keysd = keysDown();
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90 keysh = keysHeld();
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91 keysu = keysUp();
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92 touch=touchReadXY();
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93 xpos = (touch.px << 8) + 1;
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94 ypos = (touch.py << 16) / 192 + 1;
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95 /* TODO uses touch.x and touch.y for something.
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96 we discussed in the mailing list having both "hardware x/y" and
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97 "screen x/y" coordinates. maybe modify structs for that too
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98 also, find out how Colors! gets pressure and see if it's practical here
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99 */
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100
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101 if ((keysd & KEY_TOUCH)) {
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102 SDL_PrivateTouchPress(touchscreen, 0, xpos, ypos, pressure);
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103 }
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104 if ((keysh & KEY_TOUCH)) {
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105 /* sometimes the touch jumps to y=1 before it reports as keysUp */
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106 if(ypos > 1) {
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107 SDL_PrivateTouchMove(touchscreen, 0, xpos, ypos, pressure);
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108 }
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109 }
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110 if ((keysu & KEY_TOUCH)) {
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111 SDL_PrivateTouchRelease(touchscreen, 0);
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112 }
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113 }
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114
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115 /* Function to close a touchscreen after use */
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116 void
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117 SDL_SYS_TouchscreenClose(SDL_Touchscreen * touchscreen)
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118 {
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119 }
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120
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121 /* Function to perform any system-specific touchscreen related cleanup */
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122 void
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123 SDL_SYS_TouchscreenQuit(void)
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124 {
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125 }
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126 #endif /* SDL_TOUCHSCREEN_NDS */