test/snake/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>

enum Textures2d {
    TEX_SHIP = 0,
    TEX_BACKDROP,
    TEX2D_COUNT
};
static AscTexture tex2d[TEX2D_COUNT];
#define TEXTURE_SHIP &tex2d[TEX_SHIP]
#define TEXTURE_BACKDROP &tex2d[TEX_BACKDROP]

#define BACKDROP_SCENE asc_window_scene(0)
#define MAIN_SCENE asc_window_scene(1)

static void destroy_textures(void *dummy) {
    asc_texture_destroy(tex2d, TEX2D_COUNT);
}

static void init_textures(void) {
    asc_texture_init_2d(tex2d, TEX2D_COUNT);
    asc_texture_from_file(TEXTURE_SHIP, "ship.png");
    asc_texture_from_file(TEXTURE_BACKDROP, "backdrop.png");
    cxMempoolRegister(asc_active_glctx_mpool, tex2d, destroy_textures);
}

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 second
    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 scale_backdrop(AscSceneNode *node) {
    // scale the backdrop to the size of the window
    if (asc_active_window->resized) {
        asc_vec2i window_size = asc_active_window->dimensions;
        asc_set_scale2d(node, window_size.width, window_size.height);
        // TODO: implement texture repetition
    }
}

static void create_backdrop(void) {
    AscSceneNode *node = asc_sprite(.texture = TEXTURE_BACKDROP);
    asc_scene_add_behavior(node, scale_backdrop);
    asc_scene_add_node(BACKDROP_SCENE, node);
}

static void create_fps_counter(void) {
    asc_font(ASC_FONT_REGULAR, 12);
    asc_ink_rgba(224, 224, 224, 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);
}

static void create_spaceship(void) {
    AscSceneNode *sprite = asc_sprite(
        .texture = TEXTURE_SHIP,
        .x = 250,
        .y = 300,
        .width = 64,
        .height = 64
    );
    asc_scene_add_node(MAIN_SCENE, sprite);

    // TODO: return something
}

static asc_recti update_viewport_for_window_resize(asc_vec2i window_size) {
    // Compute scaling and offsets
    int viewport_size, offset_x = 0, offset_y = 0;
    if (window_size.width > window_size.height) {
        // Wider window: letterbox (black bars on top/bottom)
        offset_x = (window_size.width - window_size.height) / 2;
        viewport_size = window_size.height;
    } else {
        // Taller window: pillarbox (black bars on sides)
        offset_y = (window_size.height - window_size.width) / 2;
        viewport_size = window_size.width;
    }

    // Set the viewport to the scaled and centered region
    return (asc_recti){
        offset_x,
        offset_y,
        viewport_size,
        viewport_size
    };
}

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;
    }
#ifdef TEST_BUILD
    asc_set_font_path("../../fonts");
    asc_set_shader_path("../../shader");
    asc_set_texture_path("../../test/snake/textures");
#endif

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

    // load textures
    init_textures();

    // initialize the scenes
    const int game_field_size = 500;
    asc_scene_init(BACKDROP_SCENE, (AscCameraParams) {
        .type = ASC_CAMERA_ORTHO,
        .projection_update_func = asc_camera_ortho_update_size
    });
    asc_scene_init(MAIN_SCENE, (AscCameraParams) {
        .type = ASC_CAMERA_ORTHO,
        .ortho.rect = (asc_recti){0, 0, game_field_size, game_field_size},
        .viewport_update_func = update_viewport_for_window_resize
    });

    // backdrop for letterbox/pillarbox
    create_backdrop();

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

    // create spaceship
    create_spaceship();

    // 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());

    // cleanup
    asc_context_destroy();
    return 0;
}