Add Lua 5.4 scripting integration for dynamic game loading
- Integrated Lua 5.4 engine (32-bit mode for embedded ARM) - Created LuaGame wrapper class implementing Game interface - Added C++ bindings exposing renderer, game state, and input to Lua - Implemented SD card loader for automatic .lua game discovery - Updated GameLauncher to support std::function for lambda captures - Made Game class members public for Lua bindings access - Added example Lua games: counter, snake, bouncing ball - Included comprehensive API documentation Games can now be written as .lua text files on SD card and loaded without recompilation. Build size: 747KB UF2, Lua VM uses ~50-80KB RAM.
This commit is contained in:
Adolfo Reyna
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games/lua_examples/snake.lua
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216
games/lua_examples/snake.lua
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-- NAME: Snake Game
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-- DESC: Classic snake with state machine
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-- Game states
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local STATE_MENU = 0
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local STATE_PLAYING = 1
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local STATE_GAME_OVER = 2
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-- Game constants
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local CELL_SIZE = 10
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local GRID_W = 40
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local GRID_H = 28
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-- Initialize game
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function init()
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game.vars.state = STATE_MENU
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game.vars.score = 0
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game.vars.high_score = 0
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-- Snake as array of {x, y} positions
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game.vars.snake = {}
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game.vars.snake[1] = {x = 20, y = 14}
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game.vars.snake[2] = {x = 19, y = 14}
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game.vars.snake[3] = {x = 18, y = 14}
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game.vars.dir_x = 1
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game.vars.dir_y = 0
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game.vars.food_x = 30
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game.vars.food_y = 14
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game.vars.frame_count = 0
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game.vars.move_speed = 10 -- Frames between moves
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print("Snake Game initialized")
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end
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-- Update game logic
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function update(event)
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local state = game.vars.state
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-- State: MENU
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if state == STATE_MENU then
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if event.type == INPUT.TOUCH_DOWN or event.type == INPUT.BUTTON_0 or event.type == INPUT.BUTTON_1 then
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game.vars.state = STATE_PLAYING
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game.vars.score = 0
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init_snake()
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spawn_food()
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return true
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end
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-- State: PLAYING
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elseif state == STATE_PLAYING then
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-- Handle input for direction change
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if event.type == INPUT.TOUCH_DOWN then
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local head = game.vars.snake[1]
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local head_screen_x = head.x * CELL_SIZE
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local head_screen_y = head.y * CELL_SIZE
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local dx = event.x - head_screen_x
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local dy = event.y - head_screen_y
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-- Change direction based on touch relative to head
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if math.abs(dx) > math.abs(dy) then
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if dx > 0 and game.vars.dir_x ~= -1 then
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game.vars.dir_x = 1
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game.vars.dir_y = 0
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elseif dx < 0 and game.vars.dir_x ~= 1 then
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game.vars.dir_x = -1
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game.vars.dir_y = 0
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end
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else
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if dy > 0 and game.vars.dir_y ~= -1 then
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game.vars.dir_x = 0
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game.vars.dir_y = 1
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elseif dy < 0 and game.vars.dir_y ~= 1 then
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game.vars.dir_x = 0
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game.vars.dir_y = -1
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end
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end
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end
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-- Move snake every N frames
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game.vars.frame_count = game.vars.frame_count + 1
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if game.vars.frame_count >= game.vars.move_speed then
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game.vars.frame_count = 0
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move_snake()
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return true
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end
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-- State: GAME_OVER
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elseif state == STATE_GAME_OVER then
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if event.type == INPUT.TOUCH_DOWN or event.type == INPUT.BUTTON_0 or event.type == INPUT.BUTTON_1 then
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game.vars.state = STATE_MENU
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return true
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end
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end
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return false
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end
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-- Draw game
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function draw()
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renderer.clear(false)
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local state = game.vars.state
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-- Draw: MENU
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if state == STATE_MENU then
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renderer.text(game.width() / 2 - 30, game.height() / 2 - 20, "SNAKE", true)
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renderer.text(game.width() / 2 - 50, game.height() / 2, "Tap to Start", true)
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if game.vars.high_score > 0 then
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local hs_text = "High: " .. tostring(game.vars.high_score)
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renderer.text(game.width() / 2 - 30, game.height() / 2 + 20, hs_text, true)
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end
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-- Draw: PLAYING
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elseif state == STATE_PLAYING then
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-- Draw snake
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for i = 1, #game.vars.snake do
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local seg = game.vars.snake[i]
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local filled = (i == 1) -- Head filled, body outline
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renderer.rect(seg.x * CELL_SIZE, seg.y * CELL_SIZE, CELL_SIZE, CELL_SIZE, true, filled)
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end
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-- Draw food
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renderer.circle(game.vars.food_x * CELL_SIZE + CELL_SIZE / 2,
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game.vars.food_y * CELL_SIZE + CELL_SIZE / 2,
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CELL_SIZE / 2, true, true)
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-- Draw score
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local score_text = "Score: " .. tostring(game.vars.score)
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renderer.text(5, 5, score_text, true)
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-- Draw: GAME_OVER
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elseif state == STATE_GAME_OVER then
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renderer.text(game.width() / 2 - 40, game.height() / 2 - 20, "GAME OVER", true)
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local score_text = "Score: " .. tostring(game.vars.score)
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renderer.text(game.width() / 2 - 40, game.height() / 2, score_text, true)
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renderer.text(game.width() / 2 - 60, game.height() / 2 + 20, "Tap to Continue", true)
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end
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end
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-- Helper: Initialize snake
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function init_snake()
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game.vars.snake = {}
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game.vars.snake[1] = {x = 20, y = 14}
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game.vars.snake[2] = {x = 19, y = 14}
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game.vars.snake[3] = {x = 18, y = 14}
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game.vars.dir_x = 1
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game.vars.dir_y = 0
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end
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-- Helper: Spawn food at random position
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function spawn_food()
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game.vars.food_x = math.random(0, GRID_W - 1)
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game.vars.food_y = math.random(0, GRID_H - 1)
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end
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-- Helper: Move snake
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function move_snake()
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local head = game.vars.snake[1]
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local new_head = {
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x = head.x + game.vars.dir_x,
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y = head.y + game.vars.dir_y
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}
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-- Check wall collision
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if new_head.x < 0 or new_head.x >= GRID_W or new_head.y < 0 or new_head.y >= GRID_H then
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game_over()
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return
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end
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-- Check self collision
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for i = 1, #game.vars.snake do
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local seg = game.vars.snake[i]
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if new_head.x == seg.x and new_head.y == seg.y then
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game_over()
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return
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end
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end
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-- Check food collision
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local ate_food = false
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if new_head.x == game.vars.food_x and new_head.y == game.vars.food_y then
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ate_food = true
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game.vars.score = game.vars.score + 10
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spawn_food()
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-- Increase speed slightly
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if game.vars.move_speed > 3 then
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game.vars.move_speed = game.vars.move_speed - 1
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end
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end
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-- Move snake
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table.insert(game.vars.snake, 1, new_head)
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if not ate_food then
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table.remove(game.vars.snake) -- Remove tail
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end
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end
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-- Helper: Game over
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function game_over()
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game.vars.state = STATE_GAME_OVER
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if game.vars.score > game.vars.high_score then
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game.vars.high_score = game.vars.score
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end
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print("Game Over! Score: " .. game.vars.score)
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end
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