tip/test/snake.c

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * Copyright 2023 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.
 */

#include "ascension/core.h"
#include <ascension/ui.h>

#include <cx/printf.h>

static void update_fps_counter(AscSceneNode *node) {
    static uint64_t last_fps = 0;
    static uint64_t debounce = ASC_NANOS_SECOND - 1;
    debounce += asc_context.frame_nanos;
    // only update text every seconds
    if (debounce >= ASC_NANOS_SECOND) {
        debounce = 0;
        uint64_t fps = ASC_NANOS_SECOND;
        fps /= asc_context.frame_nanos;
        if (fps != last_fps) {
            last_fps = fps;
            asc_text_printf(node, "%"PRIu64" FPS", fps);
        }
    }
    // tie to bottom right of the screen
    if (asc_test_flag(node->flags, ASC_SCENE_NODE_GRAPHICS_UPDATED)
        || asc_active_window->resized) {
        asc_vec2i bottom_right = asc_active_window->dimensions;
        asc_vec2i scale = asc_get_scale2d(node);
        asc_set_position2d(
                node,
                bottom_right.x - scale.width - 10,
                bottom_right.y - scale.height - 10
        );
    }
}

static void create_fps_counter(void) {
    asc_font(ASC_FONT_REGULAR, 12);
    asc_ink_rgba(128, 128, 128, 196);
    AscSceneNode *node = asc_text();
    asc_scene_add_behavior(node, update_fps_counter);
    asc_add_ui_node(node);
}

static void create_score_counter(void) {
    asc_font(ASC_FONT_BOLD, 16);
    asc_ink_rgb(0, 255, 0);
    AscSceneNode* node = asc_text(
            .x = 10, .y = 10,
            .text = "Score: 0"
    );
    asc_add_ui_node(node);
}

int main(int argc, char** argv) {
    asc_context_initialize();
    if (asc_has_error()) {
        SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR,
                "Fatal Error",asc_get_error(),NULL);
        return 1;
    }

    // create window
    AscWindowSettings settings;
    asc_window_settings_init_defaults(&settings);
    settings.title = "Snake";
    asc_window_initialize(0, &settings);

    // create UI elements
    create_fps_counter();
    create_score_counter();

    // Main Loop
    do {
        // quit application on any error
        if (asc_has_error()) {
            SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR,
                    "Fatal Error", asc_get_error(),
                    asc_active_window->window);
            asc_clear_error();
            asc_context_quit();
        }

        // quit application on ESC key press
        if (asc_key_pressed(ESCAPE)) {
            asc_context_quit();
        }
    } while (asc_loop_next());

    asc_context_destroy();
    return 0;
}