Atlas - SDL_vitatouch.c
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[FILE BEGIN]
1/*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2025 Sam Lantinga <[email protected]>
4
5  This software is provided 'as-is', without any express or implied
6  warranty.  In no event will the authors be held liable for any damages
7  arising from the use of this software.
8
9  Permission is granted to anyone to use this software for any purpose,
10  including commercial applications, and to alter it and redistribute it
11  freely, subject to the following restrictions:
12
13  1. The origin of this software must not be misrepresented; you must not
14     claim that you wrote the original software. If you use this software
15     in a product, an acknowledgment in the product documentation would be
16     appreciated but is not required.
17  2. Altered source versions must be plainly marked as such, and must not be
18     misrepresented as being the original software.
19  3. This notice may not be removed or altered from any source distribution.
20*/
21#include "SDL_internal.h"
22
23#ifdef SDL_VIDEO_DRIVER_VITA
24
25#include <psp2/kernel/processmgr.h>
26#include <psp2/touch.h>
27
28#include "SDL_vitavideo.h"
29#include "SDL_vitatouch.h"
30#include "../../events/SDL_mouse_c.h"
31#include "../../events/SDL_touch_c.h"
32
33SceTouchData touch_old[SCE_TOUCH_PORT_MAX_NUM];
34SceTouchData touch[SCE_TOUCH_PORT_MAX_NUM];
35
36SDL_FRect area_info[SCE_TOUCH_PORT_MAX_NUM];
37
38struct
39{
40    float min;
41    float range;
42} force_info[SCE_TOUCH_PORT_MAX_NUM];
43
44static bool disableFrontPoll;
45static bool disableBackPoll;
46
47void VITA_InitTouch(void)
48{
49    disableFrontPoll = !SDL_GetHintBoolean(SDL_HINT_VITA_ENABLE_FRONT_TOUCH, true);
50    disableBackPoll = !SDL_GetHintBoolean(SDL_HINT_VITA_ENABLE_BACK_TOUCH, true);
51
52    sceTouchSetSamplingState(SCE_TOUCH_PORT_FRONT, SCE_TOUCH_SAMPLING_STATE_START);
53    sceTouchSetSamplingState(SCE_TOUCH_PORT_BACK, SCE_TOUCH_SAMPLING_STATE_START);
54    sceTouchEnableTouchForce(SCE_TOUCH_PORT_FRONT);
55    sceTouchEnableTouchForce(SCE_TOUCH_PORT_BACK);
56
57    for (int port = 0; port < SCE_TOUCH_PORT_MAX_NUM; port++) {
58        SceTouchPanelInfo panelinfo;
59        sceTouchGetPanelInfo(port, &panelinfo);
60
61        area_info[port].x = (float)panelinfo.minAaX;
62        area_info[port].y = (float)panelinfo.minAaY;
63        area_info[port].w = (float)(panelinfo.maxAaX - panelinfo.minAaX);
64        area_info[port].h = (float)(panelinfo.maxAaY - panelinfo.minAaY);
65
66        force_info[port].min = (float)panelinfo.minForce;
67        force_info[port].range = (float)(panelinfo.maxForce - panelinfo.minForce);
68    }
69
70    // Support passing both front and back touch devices in events
71    SDL_AddTouch(1, SDL_TOUCH_DEVICE_DIRECT, "Front");
72    SDL_AddTouch(2, SDL_TOUCH_DEVICE_INDIRECT_ABSOLUTE, "Back");
73}
74
75void VITA_QuitTouch(void)
76{
77    sceTouchDisableTouchForce(SCE_TOUCH_PORT_FRONT);
78    sceTouchDisableTouchForce(SCE_TOUCH_PORT_BACK);
79}
80
81void VITA_PollTouch(void)
82{
83    SDL_TouchID touch_id;
84    SDL_FingerID finger_id;
85    int port;
86
87    // We skip polling touch if no window is created
88    if (!Vita_Window) {
89        return;
90    }
91
92    SDL_memcpy(touch_old, touch, sizeof(touch_old));
93
94    for (port = 0; port < SCE_TOUCH_PORT_MAX_NUM; port++) {
95        /** Skip polling of Touch Device if hint is set **/
96        if (((port == 0) && disableFrontPoll) || ((port == 1) && disableBackPoll)) {
97            continue;
98        }
99        sceTouchPeek(port, &touch[port], 1);
100
101        touch_id = (SDL_TouchID)(port + 1);
102
103        if (touch[port].reportNum > 0) {
104            for (int i = 0; i < touch[port].reportNum; i++) {
105                // adjust coordinates and forces to return normalized values
106                // for the front, screen area is used as a reference (for direct touch)
107                // e.g. touch_x = 1.0 corresponds to screen_x = 960
108                // for the back panel, the active touch area is used as reference
109                float x = 0;
110                float y = 0;
111                float force = (touch[port].report[i].force - force_info[port].min) / force_info[port].range;
112                int finger_down = 0;
113
114                if (touch_old[port].reportNum > 0) {
115                    for (int j = 0; j < touch_old[port].reportNum; j++) {
116                        if (touch[port].report[i].id == touch_old[port].report[j].id) {
117                            finger_down = 1;
118                        }
119                    }
120                }
121
122                VITA_ConvertTouchXYToSDLXY(&x, &y, touch[port].report[i].x, touch[port].report[i].y, port);
123                finger_id = (SDL_FingerID)(touch[port].report[i].id + 1);
124
125                // Skip if finger was already previously down
126                if (!finger_down) {
127                    // Send an initial touch
128                    SDL_SendTouch(0, touch_id, finger_id, Vita_Window, SDL_EVENT_FINGER_DOWN, x, y, force);
129                }
130
131                // Always send the motion
132                SDL_SendTouchMotion(0, touch_id, finger_id, Vita_Window, x, y, force);
133            }
134        }
135
136        // some fingers might have been let go
137        if (touch_old[port].reportNum > 0) {
138            for (int i = 0; i < touch_old[port].reportNum; i++) {
139                int finger_up = 1;
140                if (touch[port].reportNum > 0) {
141                    for (int j = 0; j < touch[port].reportNum; j++) {
142                        if (touch[port].report[j].id == touch_old[port].report[i].id) {
143                            finger_up = 0;
144                        }
145                    }
146                }
147                if (finger_up == 1) {
148                    float x = 0;
149                    float y = 0;
150                    float force = (touch_old[port].report[i].force - force_info[port].min) / force_info[port].range;
151                    VITA_ConvertTouchXYToSDLXY(&x, &y, touch_old[port].report[i].x, touch_old[port].report[i].y, port);
152                    finger_id = (SDL_FingerID)(touch_old[port].report[i].id + 1);
153                    // Finger released from screen
154                    SDL_SendTouch(0, touch_id, finger_id, Vita_Window, SDL_EVENT_FINGER_UP, x, y, force);
155                }
156            }
157        }
158    }
159}
160
161void VITA_ConvertTouchXYToSDLXY(float *sdl_x, float *sdl_y, int vita_x, int vita_y, int port)
162{
163    float x, y;
164
165    if (area_info[port].w <= 1) {
166        x = 0.5f;
167    } else {
168        x = (vita_x - area_info[port].x) / (area_info[port].w - 1);
169    }
170    if (area_info[port].h <= 1) {
171        y = 0.5f;
172    } else {
173        y = (vita_y - area_info[port].y) / (area_info[port].h - 1);
174    }
175
176    x = SDL_max(x, 0.0f);
177    x = SDL_min(x, 1.0f);
178
179    y = SDL_max(y, 0.0f);
180    y = SDL_min(y, 1.0f);
181
182    *sdl_x = x;
183    *sdl_y = y;
184}
185
186#endif // SDL_VIDEO_DRIVER_VITA
187
[FILE END]
(C) 2025 0x4248
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