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Some triggers are a button and an axis at once: a DualSense's and a DualShock 4's report a button as soon as the trigger leaves its rest, and its position on an axis. Binding L2 or R2 by pressing it looked at buttons first, so such a trigger was bound to its button: on or off, with its analog position bound to nothing. When a button answers while L2 or R2 is being bound, the trigger's axis is now looked for and bound in the button's place. It is told by two things together: it rests at an end of its range, which a stick does not, and it has just left that rest, which the other trigger has not (menu/menu_bind_trigger.h). The rest of that pull is not taken for the next bind's press. A trigger that is a button alone is bound to its button, as before, and so is every other control. samples/input/bind_trigger_axis covers the choice of axis: the trigger's first step, a full pull, a stick held over, noise at rest, a trigger resting at the top, an axis resting in the middle. It runs in CI. The capture itself was not run with a controller.
64 lines
2.4 KiB
C
64 lines
2.4 KiB
C
/* RetroArch - A frontend for libretro.
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*
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* RetroArch is free software: you can redistribute it and/or modify it under the terms
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* of the GNU General Public License as published by the Free Software Found-
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* ation, either version 3 of the License, or (at your option) any later version.
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*
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* RetroArch is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with RetroArch.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef MENU_BIND_TRIGGER_H__
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#define MENU_BIND_TRIGGER_H__
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#include <stdint.h>
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#include <retro_inline.h>
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#include "../input/input_defines.h"
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/* Binding L2 or R2 by pressing it.
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*
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* Some triggers are a button and an axis at once: a DualSense's and a
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* DualShock 4's report a button as soon as the trigger leaves its
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* rest, and its position on an axis. The capture looks at buttons
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* first, so such a trigger was bound to its button and was on or off
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* from then on, with its analog position bound to nothing.
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*
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* When a button answers while L2 or R2 is being bound, the trigger's
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* axis is looked for, and bound in the button's place if it is there.
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* It is told by two things together: it rests at an end of its range,
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* which a stick does not, and it has just left that rest, which the
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* other trigger has not.
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*
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* Returns the bind for that axis, in the direction away from its rest,
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* or AXIS_NONE when there is none - a trigger that is a button alone,
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* which is then bound to the button as before. */
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/* how near an end an axis has to rest to be a trigger's */
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#define MENU_BIND_TRIGGER_REST 0x7000
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/* and how far it has to have left it: more than noise, less than the
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* first step a trigger reports - one 255th of the range is 257 */
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#define MENU_BIND_TRIGGER_MOVED 128
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static INLINE uint32_t menu_bind_trigger_axis(const int16_t *now,
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const int16_t *rest, unsigned count)
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{
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unsigned a;
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for (a = 0; a < count; a++)
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{
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int at_rest = rest[a];
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int moved = (int)now[a] - at_rest;
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if (at_rest <= -MENU_BIND_TRIGGER_REST && moved >= MENU_BIND_TRIGGER_MOVED)
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return AXIS_POS(a);
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if (at_rest >= MENU_BIND_TRIGGER_REST && moved <= -MENU_BIND_TRIGGER_MOVED)
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return AXIS_NEG(a);
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}
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return AXIS_NONE;
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}
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#endif
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