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 boolean SetButtonAxisPositive(int *axis_index)
{
int button;
button = FindPressedAxisButton();
if (button >= 0)
{
*axis_index |= CREATE_BUTTON_AXIS(0, button);
return true;
}
return false;
}
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;
}
