Atlas - SDL_sysjoystick.c
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1/*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2018 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#if SDL_JOYSTICK_PSP
24
25/* This is the PSP implementation of the SDL joystick API */
26#include <pspctrl.h>
27#include <pspkernel.h>
28
29#include <stdio.h>      /* For the definition of NULL */
30#include <stdlib.h>
31
32#include "../SDL_sysjoystick.h"
33#include "../SDL_joystick_c.h"
34
35#include "SDL_events.h"
36#include "SDL_error.h"
37#include "SDL_mutex.h"
38#include "SDL_timer.h"
39#include "../../thread/SDL_systhread.h"
40
41/* Current pad state */
42static SceCtrlData pad = { .Lx = 0, .Ly = 0, .Buttons = 0 };
43static SDL_sem *pad_sem = NULL;
44static SDL_Thread *thread = NULL;
45static int running = 0;
46static const enum PspCtrlButtons button_map[] = {
47    PSP_CTRL_TRIANGLE, PSP_CTRL_CIRCLE, PSP_CTRL_CROSS, PSP_CTRL_SQUARE,
48    PSP_CTRL_LTRIGGER, PSP_CTRL_RTRIGGER,
49    PSP_CTRL_DOWN, PSP_CTRL_LEFT, PSP_CTRL_UP, PSP_CTRL_RIGHT,
50    PSP_CTRL_SELECT, PSP_CTRL_START, PSP_CTRL_HOME, PSP_CTRL_HOLD };
51static int analog_map[256];  /* Map analog inputs to -32768 -> 32767 */
52
53typedef struct
54{
55  int x;
56  int y;
57} point;
58
59/* 4 points define the bezier-curve. */
60static point a = { 0, 0 };
61static point b = { 50, 0  };
62static point c = { 78, 32767 };
63static point d = { 128, 32767 };
64
65/* simple linear interpolation between two points */
66static SDL_INLINE void lerp (point *dest, point *a, point *b, float t)
67{
68    dest->x = a->x + (b->x - a->x)*t;
69    dest->y = a->y + (b->y - a->y)*t;
70}
71
72/* evaluate a point on a bezier-curve. t goes from 0 to 1.0 */
73static int calc_bezier_y(float t)
74{
75    point ab, bc, cd, abbc, bccd, dest;
76    lerp (&ab, &a, &b, t);           /* point between a and b */
77    lerp (&bc, &b, &c, t);           /* point between b and c */
78    lerp (&cd, &c, &d, t);           /* point between c and d */
79    lerp (&abbc, &ab, &bc, t);       /* point between ab and bc */
80    lerp (&bccd, &bc, &cd, t);       /* point between bc and cd */
81    lerp (&dest, &abbc, &bccd, t);   /* point on the bezier-curve */
82    return dest.y;
83}
84
85/*
86 * Collect pad data about once per frame
87 */
88int JoystickUpdate(void *data)
89{
90    while (running) {
91        SDL_SemWait(pad_sem);
92        sceCtrlPeekBufferPositive(&pad, 1);
93        SDL_SemPost(pad_sem);
94        /* Delay 1/60th of a second */
95        sceKernelDelayThread(1000000 / 60);
96    }
97    return 0;
98}
99
100
101
102/* Function to scan the system for joysticks.
103 * Joystick 0 should be the system default joystick.
104 * It should return number of joysticks, or -1 on an unrecoverable fatal error.
105 */
106int SDL_SYS_JoystickInit(void)
107{
108    int i;
109
110    /* Setup input */
111    sceCtrlSetSamplingCycle(0);
112    sceCtrlSetSamplingMode(PSP_CTRL_MODE_ANALOG);
113
114    /* Start thread to read data */
115    if((pad_sem =  SDL_CreateSemaphore(1)) == NULL) {
116        return SDL_SetError("Can't create input semaphore");
117    }
118    running = 1;
119    if((thread = SDL_CreateThreadInternal(JoystickUpdate, "JoystickThread", 4096, NULL)) == NULL) {
120        return SDL_SetError("Can't create input thread");
121    }
122
123    /* Create an accurate map from analog inputs (0 to 255)
124       to SDL joystick positions (-32768 to 32767) */
125    for (i = 0; i < 128; i++)
126    {
127        float t = (float)i/127.0f;
128        analog_map[i+128] = calc_bezier_y(t);
129        analog_map[127-i] = -1 * analog_map[i+128];
130    }
131
132    return 1;
133}
134
135int SDL_SYS_NumJoysticks(void)
136{
137    return 1;
138}
139
140void SDL_SYS_JoystickDetect(void)
141{
142}
143
144/* Function to get the device-dependent name of a joystick */
145const char * SDL_SYS_JoystickNameForDeviceIndex(int device_index)
146{
147    return "PSP builtin joypad";
148}
149
150/* Function to perform the mapping from device index to the instance id for this index */
151SDL_JoystickID SDL_SYS_GetInstanceIdOfDeviceIndex(int device_index)
152{
153    return device_index;
154}
155
156/* Function to get the device-dependent name of a joystick */
157const char *SDL_SYS_JoystickName(int index)
158{
159    if (index == 0)
160        return "PSP controller";
161
162    SDL_SetError("No joystick available with that index");
163    return(NULL);
164}
165
166/* Function to open a joystick for use.
167   The joystick to open is specified by the device index.
168   This should fill the nbuttons and naxes fields of the joystick structure.
169   It returns 0, or -1 if there is an error.
170 */
171int SDL_SYS_JoystickOpen(SDL_Joystick *joystick, int device_index)
172{
173    joystick->nbuttons = 14;
174    joystick->naxes = 2;
175    joystick->nhats = 0;
176
177    return 0;
178}
179
180/* Function to update the state of a joystick - called as a device poll.
181 * This function shouldn't update the joystick structure directly,
182 * but instead should call SDL_PrivateJoystick*() to deliver events
183 * and update joystick device state.
184 */
185void SDL_SYS_JoystickUpdate(SDL_Joystick *joystick)
186{
187    int i;
188    enum PspCtrlButtons buttons;
189    enum PspCtrlButtons changed;
190    unsigned char x, y;
191    static enum PspCtrlButtons old_buttons = 0;
192    static unsigned char old_x = 0, old_y = 0;
193
194    SDL_SemWait(pad_sem);
195    buttons = pad.Buttons;
196    x = pad.Lx;
197    y = pad.Ly;
198    SDL_SemPost(pad_sem);
199
200    /* Axes */
201    if(old_x != x) {
202        SDL_PrivateJoystickAxis(joystick, 0, analog_map[x]);
203        old_x = x;
204    }
205    if(old_y != y) {
206        SDL_PrivateJoystickAxis(joystick, 1, analog_map[y]);
207        old_y = y;
208    }
209
210    /* Buttons */
211    changed = old_buttons ^ buttons;
212    old_buttons = buttons;
213    if(changed) {
214        for(i=0; i<sizeof(button_map)/sizeof(button_map[0]); i++) {
215            if(changed & button_map[i]) {
216                SDL_PrivateJoystickButton(
217                    joystick, i,
218                    (buttons & button_map[i]) ?
219                    SDL_PRESSED : SDL_RELEASED);
220            }
221        }
222    }
223
224    sceKernelDelayThread(0);
225}
226
227/* Function to close a joystick after use */
228void SDL_SYS_JoystickClose(SDL_Joystick *joystick)
229{
230}
231
232/* Function to perform any system-specific joystick related cleanup */
233void SDL_SYS_JoystickQuit(void)
234{
235    /* Cleanup Threads and Semaphore. */
236    running = 0;
237    SDL_WaitThread(thread, NULL);
238    SDL_DestroySemaphore(pad_sem);
239}
240
241SDL_JoystickGUID SDL_SYS_JoystickGetDeviceGUID( int device_index )
242{
243    SDL_JoystickGUID guid;
244    /* the GUID is just the first 16 chars of the name for now */
245    const char *name = SDL_SYS_JoystickNameForDeviceIndex( device_index );
246    SDL_zero( guid );
247    SDL_memcpy( &guid, name, SDL_min( sizeof(guid), SDL_strlen( name ) ) );
248    return guid;
249}
250
251SDL_JoystickGUID SDL_SYS_JoystickGetGUID(SDL_Joystick * joystick)
252{
253    SDL_JoystickGUID guid;
254    /* the GUID is just the first 16 chars of the name for now */
255    const char *name = joystick->name;
256    SDL_zero( guid );
257    SDL_memcpy( &guid, name, SDL_min( sizeof(guid), SDL_strlen( name ) ) );
258    return guid;
259}
260
261#endif /* SDL_JOYSTICK_PSP */
262
263/* vim: ts=4 sw=4
264 */
265
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