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0.2.1 SysV ABI fix for passing certain things by struct. Fix implicitly converting to float in the case of myfloat *= -1. Prefer inferred constant over global. Allow locals to shadow global variables.
This commit is contained in:
Christoffer Lerno
251
resources/examples/raylib/raylib_snake.c3
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251
resources/examples/raylib/raylib_snake.c3
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module snake;
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/**
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*
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* raylib - classic game: snake
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*
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* Sample game developed by Ian Eito, Albert Martos and Ramon Santamaria,
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* converted to C3 and modified by Christoffer Lerno
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*
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* Copyright (c) 2015 Ramon Santamaria (@raysan5)
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*
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*/
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const SNAKE_LENGTH = 256;
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const SQUARE_SIZE = 32;
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const int SCREEN_WIDTH = 800;
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const int SCREEN_HEIGHT = 450;
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enum SnakeDirection
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{
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RIGHT,
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DOWN,
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LEFT,
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UP
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}
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struct Snake
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{
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Vector2 position;
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Vector2 size;
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Color color;
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}
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struct Food
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{
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Vector2 position;
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Vector2 size;
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bool active;
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Color color;
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}
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int frames_counter = 0;
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bool game_over = false;
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bool pause = false;
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Food fruit;
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SnakeDirection snake_direction;
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Snake[SNAKE_LENGTH] snake;
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Vector2[SNAKE_LENGTH] snake_position;
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bool allow_move = false;
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Vector2 offset;
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int counter_tail = 0;
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fn void main()
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{
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raylib::init_window(SCREEN_WIDTH, SCREEN_HEIGHT, "classic game: snake");
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init_game();
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raylib::set_target_fps(60);
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while (!raylib::window_should_close()) // Detect window close button or ESC key
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{
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update_draw_frame();
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}
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unload_game();
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raylib::close_window();
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}
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// Initialize game variables
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fn void init_game()
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{
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frames_counter = 0;
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game_over = false;
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pause = false;
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counter_tail = 1;
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allow_move = false;
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snake_direction = SnakeDirection.RIGHT;
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offset.x = SCREEN_WIDTH % SQUARE_SIZE;
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offset.y = SCREEN_HEIGHT % SQUARE_SIZE;
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for (int i = 0; i < SNAKE_LENGTH; i++)
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{
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snake[i].position = { offset.x / 2, offset.y / 2 };
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snake[i].size = { SQUARE_SIZE, SQUARE_SIZE };
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if (i == 0)
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{
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snake[i].color = raylib::DARKBLUE;
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}
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else
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{
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snake[i].color = raylib::BLUE;
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}
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}
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for (int i = 0; i < SNAKE_LENGTH; i++)
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{
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snake_position[i] = { 0.0f, 0.0f };
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}
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fruit.size = { SQUARE_SIZE, SQUARE_SIZE };
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fruit.color = raylib::SKYBLUE;
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fruit.active = false;
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}
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fn void update_game()
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{
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if (game_over)
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{
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if (raylib::is_key_pressed(keyboard::ENTER))
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{
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init_game();
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game_over = false;
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}
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return;
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}
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if (raylib::is_key_pressed((KeyboardKey)'P')) pause = !pause;
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if (pause) return;
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if (raylib::is_key_pressed(keyboard::RIGHT) && allow_move)
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{
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snake_direction = (SnakeDirection)((snake_direction + 1) % 4);
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allow_move = false;
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}
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if (raylib::is_key_pressed(keyboard::LEFT) && allow_move)
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{
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snake_direction = (SnakeDirection)((snake_direction + 3) % 4);
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allow_move = false;
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}
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// Snake movement
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for (int i = 0; i < counter_tail; i++) snake_position[i] = snake[i].position;
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if (frames_counter++ % 5 != 0) return;
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allow_move = true;
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switch (snake_direction)
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{
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case RIGHT:
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snake[0].position.x += SQUARE_SIZE;
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snake[0].position.y += 0;
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case UP:
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snake[0].position.x += 0;
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snake[0].position.y += -SQUARE_SIZE;
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case DOWN:
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snake[0].position.x += 0;
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snake[0].position.y += SQUARE_SIZE;
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case LEFT:
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snake[0].position.x += -SQUARE_SIZE;
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snake[0].position.y += 0;
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default:
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@unreachable();
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}
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for (int i = 1; i < counter_tail; i++)
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{
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snake[i].position = snake_position[i - 1];
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}
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// Wall behaviour
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if (((snake[0].position.x) > (SCREEN_WIDTH - offset.x)) ||
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((snake[0].position.y) > (SCREEN_HEIGHT - offset.y)) ||
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(snake[0].position.x < 0) || (snake[0].position.y < 0))
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{
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game_over = true;
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}
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// Collision with yourself
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for (int i = 1; i < counter_tail; i++)
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{
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if ((snake[0].position.x == snake[i].position.x) && (snake[0].position.y == snake[i].position.y)) game_over = true;
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}
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// Fruit position calculation
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if (!fruit.active)
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{
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fruit.active = true;
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fruit.position = { raylib::get_random_value(0, (SCREEN_WIDTH / SQUARE_SIZE) - 1) * SQUARE_SIZE + offset.x/2, raylib::get_random_value(0, (SCREEN_HEIGHT / SQUARE_SIZE) - 1) * SQUARE_SIZE + offset.y / 2 };
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for (int i = 0; i < counter_tail; i++)
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{
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while ((fruit.position.x == snake[i].position.x) && (fruit.position.y == snake[i].position.y))
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{
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fruit.position = { raylib::get_random_value(0, (SCREEN_WIDTH / SQUARE_SIZE) - 1) * SQUARE_SIZE + offset.x/2, raylib::get_random_value(0, (SCREEN_HEIGHT / SQUARE_SIZE) - 1) * SQUARE_SIZE + offset.y / 2 };
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i = 0;
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}
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}
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}
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// Collision
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if ((snake[0].position.x < (fruit.position.x + fruit.size.x) && (snake[0].position.x + snake[0].size.x) > fruit.position.x) &&
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(snake[0].position.y < (fruit.position.y + fruit.size.y) && (snake[0].position.y + snake[0].size.y) > fruit.position.y))
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{
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snake[counter_tail].position = snake_position[counter_tail - 1];
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counter_tail += 1;
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fruit.active = false;
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}
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}
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// Draw game (one frame)
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fn void draw_game()
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{
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raylib::begin_drawing();
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raylib::clear_background(raylib::RAYWHITE);
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if (!game_over)
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{
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// Draw grid lines
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for (int i = 0; i < SCREEN_WIDTH / SQUARE_SIZE + 1; i++)
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{
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raylib::draw_line_v({SQUARE_SIZE * i + offset.x/2, offset.y/2}, {SQUARE_SIZE * i + offset.x/2, SCREEN_HEIGHT - offset.y/2}, raylib::LIGHTGRAY);
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}
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for (int i = 0; i < SCREEN_HEIGHT/SQUARE_SIZE + 1; i++)
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{
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raylib::draw_line_v({offset.x/2, SQUARE_SIZE * i + offset.y / 2 }, { SCREEN_WIDTH - offset.x/2, SQUARE_SIZE * i + offset.y / 2 }, raylib::LIGHTGRAY);
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}
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// Draw snake
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for (int i = 0; i < counter_tail; i++) raylib::draw_rectangle_v(snake[i].position, snake[i].size, snake[i].color);
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// Draw fruit to pick
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raylib::draw_rectangle_v(fruit.position, fruit.size, fruit.color);
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if (pause) raylib::draw_text("GAME PAUSED", SCREEN_WIDTH/2 - raylib::measure_text("GAME PAUSED", 40)/2, SCREEN_HEIGHT / 2 - 40, 40, raylib::GRAY);
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}
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else
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{
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raylib::draw_text("PRESS [ENTER] TO PLAY AGAIN", raylib::get_screen_width()/2 - raylib::measure_text("PRESS [ENTER] TO PLAY AGAIN", 20)/2, raylib::get_screen_height()/2 - 50, 20, raylib::GRAY);
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}
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raylib::end_drawing();
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}
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// Unload game variables
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fn void unload_game()
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{
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// TODO: Unload all dynamic loaded data (textures, sounds, models...)
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}
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// Update and Draw (one frame)
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fn void update_draw_frame()
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{
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update_game();
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draw_game();
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}
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