src/ascension/input.h

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * Copyright 2024 Mike Becker. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *
 *   2. Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef ASCENSION_INPUT_H
#define ASCENSION_INPUT_H

#include <SDL2/SDL_scancode.h>

typedef struct asc_input_s {
    /**
     * The last X position of the mouse in \c mouse_window.
     */
    int mouse_x;
    /**
     * The last Y position of the mouse in \c mouse_window.
     */
    int mouse_y;
    /**
     * The mouse movement in X direction since the last frame.
     */
    int mouse_xrel;
    /**
     * The mouse movement in Y direction since the last frame.
     */
    int mouse_yrel;
    /**
     * The index of the window, the mouse was last seen in.
     */
    unsigned mouse_window;
    /**
     * State of the keys.
     * @see asc_key_pressed()
     * @see asc_key_released()
     * @see asc_key_down()
     * @see asc_key_up()
     */
    unsigned char keys[SDL_NUM_SCANCODES];
} AscInput;

#define ASC_KEY_DOWN_FLAG     1u
#define ASC_KEY_PRESS_FLAG    2u
#define ASC_KEY_RELEASE_FLAG  4u

#define ASC_KEY(name) SDL_SCANCODE_##name

#define asc_key_down(scancode) \
    (asc_context.input.keys[scancode] & ASC_KEY_DOWN_FLAG)
#define asc_key_up(scancode) \
    (asc_context.input.keys[scancode] == 0)
#define asc_key_pressed(scancode) \
    (asc_context.input.keys[scancode] & ASC_KEY_PRESS_FLAG)
#define asc_key_released(scancode) \
    (asc_context.input.keys[scancode] & ASC_KEY_RELEASE_FLAG)

#define asc_mouse_x asc_context.input.mouse_x
#define asc_mouse_y asc_context.input.mouse_y
#define asc_mouse_window asc_context.input.mouse_window
// TODO: think about whether this should be asc_vec2u
#define asc_mouse_pos ((asc_vec2i) {asc_mouse_x, asc_mouse_y})

#define asc_mouse_move_x asc_context.input.mouse_xrel
#define asc_mouse_move_y asc_context.input.mouse_yrel
#define asc_mouse_move ((asc_vec2i) {asc_mouse_move_x, asc_mouse_move_y})

#endif //ASCENSION_INPUT_H