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 <ascension/sprite.h>
#include <ascension/2d.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) {
    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");
    asc_gl_context_add_cleanup_func(asc_active_glctx, destroy_textures);
}

static void update_fps_counter(AscBehavior *behavior) {
    AscSceneNode *node = behavior->node;
    static float last_fps = 0.f;
    if (fabsf(asc_context.frame_rate - last_fps) > 1) {
        last_fps = asc_context.frame_rate;
        asc_text_printf(node, "%.2f FPS", asc_context.frame_rate);
    }
}

static void tie_fps_counter_to_corner(AscBehavior *behavior) {
    // TODO: this should be replaced with some sort of UI layout manager
    AscSceneNode *node = behavior->node;
    if (asc_test_flag(node->flags, ASC_SCENE_NODE_GRAPHICS_UPDATED) || asc_active_window->resized) {
        asc_vec2u bottom_right = asc_active_window->dimensions;
        asc_vec2u text_size = ((AscText*)node)->dimension;
        asc_set_position2d(
                node,
                (int)bottom_right.x - (int)text_size.width - 10,
                (int)bottom_right.y - (int)text_size.height - 10
        );
    }
}

static void scale_backdrop(AscBehavior *behavior) {
    // scale the backdrop to the size of the window
    if (asc_active_window->resized) {
        AscSceneNode *node = behavior->node;
        asc_vec2u window_size = asc_active_window->dimensions;
        asc_sprite_set_size(node, window_size.width, window_size.height);
    }
}

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

static void create_fps_counter(void) {
    asc_font(ASC_FONT_REGULAR, 12);
    asc_ink_rgb(255, 255, 255);
    AscSceneNode *node = asc_text(.name = "FPS Counter");
    asc_behavior_add(node, .func = update_fps_counter, .interval = asc_seconds(1));
    asc_behavior_add(node, tie_fps_counter_to_corner);
    asc_ui_add_node(node);
}

static void update_score_counter(AscBehavior *behavior) {
    AscSceneNode *node = behavior->node;
    static unsigned test_score = 0;
    test_score += 100;
    asc_text_printf(node, "Score: %u", test_score);
    if (test_score > 9000) {
        asc_behavior_remove(behavior);
    }
}

static void create_score_counter(void) {
    asc_font(ASC_FONT_BOLD, 16);
    asc_ink_rgb(0, 255, 0);
    AscSceneNode *node = asc_text(
        .name = "Score Counter",
        .x = 10, .y = 10,
        .text = "Score: 0"
    );
    // TODO: remove this test behavior
    asc_behavior_add(node, .func = update_score_counter, .interval = asc_milliseconds(250));
    asc_ui_add_node(node);
}

static void create_spaceship(void) {
    AscSceneNode *sprite = asc_sprite(
        .name = "Player",
        .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_vec2u window_size) {
    // Compute scaling and offsets
    unsigned 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(void) {
    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);
    asc_ui_scale_auto();

    // load textures
    init_textures();

    // initialize the scenes
    const int game_field_size = 500;
    asc_scene_init(BACKDROP_SCENE,
        .type = ASC_CAMERA_ORTHO,
        .projection_update_func = asc_camera_ortho_update_size
    );
    asc_ink_rgb(0, 128, 90);
    asc_scene_init(MAIN_SCENE,
        .type = ASC_CAMERA_ORTHO,
        .ortho.rect = ASC_RECTI(0, 0, game_field_size, game_field_size),
        .viewport_clear = true,
        .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();
        }

        // debug-key for clearing the shader registry
        if (asc_key_pressed(ASC_KEY(S))) {
            asc_shader_clear_registry();
            asc_dprintf("Shader cache cleared.");
        }

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

    // cleanup
    asc_context_destroy();
    return 0;
}