ref: 1af3061a6abb9586641be1f4a20b485662a3b36f
dir: /src/setup/txt_joyaxis.c/
//
// 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"
#include "txt_utf8.h"
#define JOYSTICK_AXIS_WIDTH 20
static const 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.";
}
}
return NULL;
}
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)
{
axis_value = SDL_JoystickGetAxis(joystick_axis->joystick, i);
if (joystick_axis->bad_axis[i])
{
continue;
}
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;
}
return -1;
}
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_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 == SDL_JoystickInstanceID(joystick_axis->joystick)
&& 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)
{
TXT_MessageBox(NULL, "Please configure a controller first!");
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 = TXT_UTF8_Strlen(buf); i < joystick_axis->widget.w; ++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;
}