summaryrefslogtreecommitdiff
path: root/src/setup/txt_joyaxis.c
blob: 927c0473093e9ded596105ff8c6846232b56c531 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
//
// Copyright(C) 2014 Simon Howard
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program 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 General Public License for more details.
//

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "SDL.h"

#include "joystick.h"
#include "i_joystick.h"
#include "i_system.h"
#include "m_controls.h"
#include "m_misc.h"

#include "textscreen.h"
#include "txt_gui.h"
#include "txt_io.h"
#include "txt_joyaxis.h"

#define JOYSTICK_AXIS_WIDTH 24

static char *CalibrationLabel(txt_joystick_axis_t *joystick_axis)
{
    switch (joystick_axis->config_stage)
    {
        case CONFIG_CENTER:
            return "Center the D-pad or joystick,\n"
                   "and press a button.";

        case CONFIG_STAGE1:
            if (joystick_axis->dir == JOYSTICK_AXIS_VERTICAL)
            {
                return "Push the D-pad or joystick up,\n"
                       "and press the button.";
            }
            else
            {
                return "Push the D-pad or joystick to the\n"
                       "left, and press the button.";
            }

        case CONFIG_STAGE2:
            if (joystick_axis->dir == JOYSTICK_AXIS_VERTICAL)
            {
                return "Push the D-pad or joystick down,\n"
                       "and press the button.";
            }
            else
            {
                return "Push the D-pad or joystick to the\n"
                       "right, and press the button.";
            }
    }
}

static void SetCalibrationLabel(txt_joystick_axis_t *joystick_axis)
{
    TXT_SetLabel(joystick_axis->config_label, CalibrationLabel(joystick_axis));
}

// Search all axes on joystick being configured; find a button that is
// pressed (other than the calibrate button). Returns the button number.

static int FindPressedAxisButton(txt_joystick_axis_t *joystick_axis)
{
    int i;

    for (i = 0; i < SDL_JoystickNumButtons(joystick_axis->joystick); ++i)
    {
        if (i == joystick_axis->config_button)
        {
            continue;
        }

        if (SDL_JoystickGetButton(joystick_axis->joystick, i))
        {
            return i;
        }
    }

    return -1;
}

// Look for a hat that isn't centered. Returns the encoded hat axis.

static int FindUncenteredHat(SDL_Joystick *joystick, int *axis_invert)
{
    int i, hatval;

    for (i = 0; i < SDL_JoystickNumHats(joystick); ++i)
    {
        hatval = SDL_JoystickGetHat(joystick, i);

        switch (hatval)
        {
            case SDL_HAT_LEFT:
            case SDL_HAT_RIGHT:
                *axis_invert = hatval != SDL_HAT_LEFT;
                return CREATE_HAT_AXIS(i, HAT_AXIS_HORIZONTAL);

            case SDL_HAT_UP:
            case SDL_HAT_DOWN:
                *axis_invert = hatval != SDL_HAT_UP;
                return CREATE_HAT_AXIS(i, HAT_AXIS_VERTICAL);

            // If the hat is centered, or is not pointing in a
            // definite direction, then ignore it. We don't accept
            // the hat being pointed to the upper-left for example,
            // because it's ambiguous.
            case SDL_HAT_CENTERED:
            default:
                break;
        }
    }

    // None found.
    return -1;
}

static boolean CalibrateAxis(txt_joystick_axis_t *joystick_axis)
{
    int best_axis;
    int best_value;
    int best_invert;
    Sint16 axis_value;
    int i;

    // Check all axes to find which axis has the largest value.  We test
    // for one axis at a time, so eg. when we prompt to push the joystick 
    // left, whichever axis has the largest value is the left axis.

    best_axis = 0;
    best_value = 0;
    best_invert = 0;

    for (i = 0; i < SDL_JoystickNumAxes(joystick_axis->joystick); ++i)
    {
       //if (bad_axis[i])
       //{
       //    continue;
       //}

        axis_value = SDL_JoystickGetAxis(joystick_axis->joystick, i);

        if (abs(axis_value) > best_value)
        {
            best_value = abs(axis_value);
            best_invert = axis_value > 0;
            best_axis = i;
        }
    }

    // Did we find one axis that had a significant value?

    if (best_value > 32768 / 4)
    {
        // Save the best values we have found

        *joystick_axis->axis = best_axis;
        *joystick_axis->invert = best_invert;
        return true;
    }

    // Otherwise, maybe this is a "button axis", like the PS3 SIXAXIS
    // controller that exposes the D-pad as four individual buttons.
    // Search for a button.

    i = FindPressedAxisButton(joystick_axis);

    if (i >= 0)
    {
        *joystick_axis->axis = CREATE_BUTTON_AXIS(i, 0);
        *joystick_axis->invert = 0;
        return true;
    }

    // Maybe it's a D-pad that is presented as a hat. This sounds weird
    // but gamepads like this really do exist; an example is the
    // Nyko AIRFLO Ex.

    i = FindUncenteredHat(joystick_axis->joystick, joystick_axis->invert);

    if (i >= 0)
    {
        *joystick_axis->axis = i;
        return true;
    }

    // User pressed the button without pushing the joystick anywhere.
    return false;
}

static boolean SetButtonAxisPositive(txt_joystick_axis_t *joystick_axis)
{
    int button;

    button = FindPressedAxisButton(joystick_axis);

    if (button >= 0)
    {
        *joystick_axis->axis |= CREATE_BUTTON_AXIS(0, button);
        return true;
    }

    return false;
}

static void IdentifyBadAxes(txt_joystick_axis_t *joystick_axis)
{
    int i, val;

    free(joystick_axis->bad_axis);

    joystick_axis->bad_axis
        = calloc(SDL_JoystickNumAxes(joystick_axis->joystick),
                                     sizeof(boolean));

    // Look for uncentered axes.

    for (i = 0; i < SDL_JoystickNumAxes(joystick_axis->joystick); ++i)
    {
        val = SDL_JoystickGetAxis(joystick_axis->joystick, i);

        joystick_axis->bad_axis[i] = abs(val) > (32768 / 5);

        if (joystick_axis->bad_axis[i])
        {
            printf("Ignoring uncentered joystick axis #%i: %i\n", i, val);
        }
    }
}

static int NextCalibrateStage(txt_joystick_axis_t *joystick_axis)
{
    switch (joystick_axis->config_stage)
    {
        case CONFIG_CENTER:
            return CONFIG_STAGE1;

        // After pushing to the left, there are two possibilities:
        // either it is a button axis, in which case we need to find
        // the other button, or we can just move on to the next axis.
        case CONFIG_STAGE1:
            if (IS_BUTTON_AXIS(*joystick_axis->axis))
            {
                return CONFIG_STAGE2;
            }
            else
            {
                return CONFIG_CENTER;
            }

        case CONFIG_STAGE2:
            return CONFIG_CENTER;
    }
}

static int EventCallback(SDL_Event *event, TXT_UNCAST_ARG(joystick_axis))
{
    TXT_CAST_ARG(txt_joystick_axis_t, joystick_axis);
    boolean advance;

    if (event->type != SDL_JOYBUTTONDOWN)
    {
        return 0;
    }

    // At this point, we have a button press.
    // In the first "center" stage, we're just trying to work out which
    // joystick is being configured and which button the user is pressing.
    if (joystick_axis->config_stage == CONFIG_CENTER)
    {
        joystick_index = event->jbutton.which;
        joystick_axis->config_button = event->jbutton.button;
        IdentifyBadAxes(joystick_axis);

        // Advance to next stage.
        joystick_axis->config_stage = CONFIG_STAGE1;
        SetCalibrationLabel(joystick_axis);

        return 1;
    }

    // In subsequent stages, the user is asked to push in a specific
    // direction and press the button. They must push the same button
    // as they did before; this is necessary to support button axes.
    if (event->jbutton.which == joystick_index
     && event->jbutton.button == joystick_axis->config_button)
    {
        switch (joystick_axis->config_stage)
        {
            default:
            case CONFIG_STAGE1:
                advance = CalibrateAxis(joystick_axis);
                break;

            case CONFIG_STAGE2:
                advance = SetButtonAxisPositive(joystick_axis);
                break;
        }

        // Advance to the next calibration stage?

        if (advance)
        {
            joystick_axis->config_stage = NextCalibrateStage(joystick_axis);
            SetCalibrationLabel(joystick_axis);

            // Finished?
            if (joystick_axis->config_stage == CONFIG_CENTER)
            {
                TXT_CloseWindow(joystick_axis->config_window);

                if (joystick_axis->callback != NULL)
                {
                    joystick_axis->callback();
                }
            }

            return 1;
        }
    }

    return 0;
}

static void CalibrateWindowClosed(TXT_UNCAST_ARG(widget),
                                  TXT_UNCAST_ARG(joystick_axis))
{
    TXT_CAST_ARG(txt_joystick_axis_t, joystick_axis);

    free(joystick_axis->bad_axis);
    joystick_axis->bad_axis = NULL;

    SDL_JoystickClose(joystick_axis->joystick);
    SDL_JoystickEventState(SDL_DISABLE);
    SDL_QuitSubSystem(SDL_INIT_JOYSTICK);
    TXT_SDL_SetEventCallback(NULL, NULL);
}

void TXT_ConfigureJoystickAxis(txt_joystick_axis_t *joystick_axis,
                               int using_button,
                               txt_joystick_axis_callback_t callback)
{
    // Open the joystick first.
    if (SDL_Init(SDL_INIT_JOYSTICK) < 0)
    {
        return;
    }

    joystick_axis->joystick = SDL_JoystickOpen(joystick_index);
    if (joystick_axis->joystick == NULL)
    {
        // TODO: OpenErrorWindow();
        return;
    }

    SDL_JoystickEventState(SDL_ENABLE);

    // Build the prompt window.

    joystick_axis->config_window
        = TXT_NewWindow("Gamepad/Joystick calibration");
    TXT_AddWidgets(joystick_axis->config_window,
                   TXT_NewStrut(0, 1),
                   joystick_axis->config_label = TXT_NewLabel(""),
                   TXT_NewStrut(0, 1),
                   NULL);

    TXT_SetWindowAction(joystick_axis->config_window, TXT_HORIZ_LEFT, NULL);
    TXT_SetWindowAction(joystick_axis->config_window, TXT_HORIZ_CENTER,
                        TXT_NewWindowAbortAction(joystick_axis->config_window));
    TXT_SetWindowAction(joystick_axis->config_window, TXT_HORIZ_RIGHT, NULL);
    TXT_SetWidgetAlign(joystick_axis->config_window, TXT_HORIZ_CENTER);

    if (using_button >= 0)
    {
        joystick_axis->config_stage = CONFIG_STAGE1;
        joystick_axis->config_button = using_button;
        IdentifyBadAxes(joystick_axis);
    }
    else
    {
        joystick_axis->config_stage = CONFIG_CENTER;
    }

    SetCalibrationLabel(joystick_axis);

    // Close the joystick and shut down joystick subsystem when the window
    // is closed.
    TXT_SignalConnect(joystick_axis->config_window, "closed",
                      CalibrateWindowClosed, joystick_axis);

    TXT_SDL_SetEventCallback(EventCallback, joystick_axis);

    // When successfully calibrated, invoke this callback:
    joystick_axis->callback = callback;
}

static void TXT_JoystickAxisSizeCalc(TXT_UNCAST_ARG(joystick_axis))
{
    TXT_CAST_ARG(txt_joystick_axis_t, joystick_axis);

    // All joystickinputs are the same size.

    joystick_axis->widget.w = JOYSTICK_AXIS_WIDTH;
    joystick_axis->widget.h = 1;
}

static void TXT_JoystickAxisDrawer(TXT_UNCAST_ARG(joystick_axis))
{
    TXT_CAST_ARG(txt_joystick_axis_t, joystick_axis);
    char buf[JOYSTICK_AXIS_WIDTH + 1];
    int i;

    if (*joystick_axis->axis < 0)
    {
        M_StringCopy(buf, "(None)", sizeof(buf));
    }
    else if (IS_BUTTON_AXIS(*joystick_axis->axis))
    {
        int neg, pos;

        neg = BUTTON_AXIS_NEG(*joystick_axis->axis);
        pos = BUTTON_AXIS_POS(*joystick_axis->axis);
        M_snprintf(buf, sizeof(buf), "BUTTONS #%i+#%i", neg, pos);
    }
    else if (IS_HAT_AXIS(*joystick_axis->axis))
    {
        int hat, dir;

        hat = HAT_AXIS_HAT(*joystick_axis->axis);
        dir = HAT_AXIS_DIRECTION(*joystick_axis->axis);

        M_snprintf(buf, sizeof(buf), "HAT #%i (%s)", hat,
                   dir == HAT_AXIS_HORIZONTAL ? "horizontal" : "vertical");
    }
    else
    {
        M_snprintf(buf, sizeof(buf), "AXIS #%i", *joystick_axis->axis);
    }

    TXT_SetWidgetBG(joystick_axis);
    TXT_FGColor(TXT_COLOR_BRIGHT_WHITE);

    TXT_DrawString(buf);

    for (i=strlen(buf); i<JOYSTICK_AXIS_WIDTH; ++i)
    {
        TXT_DrawString(" ");
    }
}

static void TXT_JoystickAxisDestructor(TXT_UNCAST_ARG(joystick_axis))
{
}

static int TXT_JoystickAxisKeyPress(TXT_UNCAST_ARG(joystick_axis), int key)
{
    TXT_CAST_ARG(txt_joystick_axis_t, joystick_axis);

    if (key == KEY_ENTER)
    {
        TXT_ConfigureJoystickAxis(joystick_axis, -1, NULL);
        return 1;
    }

    if (key == KEY_BACKSPACE || key == KEY_DEL)
    {
        *joystick_axis->axis = -1;
    }

    return 0;
}

static void TXT_JoystickAxisMousePress(TXT_UNCAST_ARG(widget),
                                       int x, int y, int b)
{
    TXT_CAST_ARG(txt_joystick_axis_t, widget);

    // Clicking is like pressing enter

    if (b == TXT_MOUSE_LEFT)
    {
        TXT_JoystickAxisKeyPress(widget, KEY_ENTER);
    }
}

txt_widget_class_t txt_joystick_axis_class =
{
    TXT_AlwaysSelectable,
    TXT_JoystickAxisSizeCalc,
    TXT_JoystickAxisDrawer,
    TXT_JoystickAxisKeyPress,
    TXT_JoystickAxisDestructor,
    TXT_JoystickAxisMousePress,
    NULL,
};

txt_joystick_axis_t *TXT_NewJoystickAxis(int *axis, int *invert,
                                         txt_joystick_axis_direction_t dir)
{
    txt_joystick_axis_t *joystick_axis;

    joystick_axis = malloc(sizeof(txt_joystick_axis_t));

    TXT_InitWidget(joystick_axis, &txt_joystick_axis_class);
    joystick_axis->axis = axis;
    joystick_axis->invert = invert;
    joystick_axis->dir = dir;
    joystick_axis->bad_axis = NULL;

    return joystick_axis;
}