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/ascension.h>
#include <cx/printf.h>

static void update_fps_counter(AscSceneNode *node) {
    // addition and multiplication is more efficient testing for zero
    // at an unnoticeable cost of imprecision
    static unsigned last_fps = 0u;
    static unsigned debounce = 999u;
    unsigned fps = 1000u;
    debounce += asc_context.elapsed_millis;
    if (debounce >= 1000u) {
        debounce = 0;
        fps /= asc_context.elapsed_millis;
        if (fps != last_fps) {
            last_fps = fps;
            snprintf(asc_text_data(node)->text, 9, "%u FPS", fps);
            asc_node_update(node);
        }
    }
}

static void create_fps_counter(void) {
    asc_set_font(asc_font(ASC_FONT_REGULAR, 24));
    asc_ink_rgb(255, 0, 0);
    AscSceneNode* node = asc_text(10, 10, "XXXXX FPS");
    asc_scene_add_behavior(node, update_fps_counter);
    asc_scene_add(&asc_window_active->ui, node);
}

static void update_score_counter(AscSceneNode *node) {
    AscText *text = asc_text_data(node);

    // tie to bottom left of the screen
    if (asc_window_active->resized) {
        asc_vec2i bottom_left = asc_window_active->dimensions;
        text->position.x = bottom_left.x - text->dimension.width - 10;
        text->position.y = bottom_left.y - text->dimension.height - 10;
        asc_node_update_transform(text);
    }
}

static void create_score_counter(void) {
    asc_set_font(asc_font(ASC_FONT_BOLD, 14));
    asc_ink_rgb(0, 255, 0);
    AscSceneNode* node = asc_text(0, 0, "Score: 0");
    asc_scene_add_behavior(node, update_score_counter);
    asc_scene_add(&asc_window_active->ui, 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;
    }

    AscWindowSettings settings;
    asc_window_settings_init_defaults(&settings);
    settings.title = "Snake";

    AscWindow *window = asc_window_initialize(0, &settings);
    asc_shader_initialize_predefined();

    // 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(), window->window);
            asc_clear_error();
            break;
        }
    } while (asc_loop_next());

    asc_context_destroy();
    return 0;
}