Add Wall API sample. Restore simple level sample.

content/levels/sample_simple_level/level.lua

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+-- Set how large the level will be.
+pewpew.set_level_size(500fx, 500fx)
+
+-- Create an entity at position (0,0) that will hold the background mesh.
+local background = pewpew.new_customizable_entity(0fx, 0fx)
+pewpew.customizable_entity_set_mesh(background, "/dynamic/square500x500_graphic.lua", 0)
+
+-- Create the player's ship.
+local player_x = 250fx
+local player_y = 100fx
+local player_index = 0 -- there is only one player
+pewpew.new_player_ship(player_x, player_y, player_index)
+
+-- Create a "baf" enemy.
+local baf_x = 250fx
+local baf_y = 400fx
+local baf_angle = 0fx
+local baf_speed = 10fx
+local lifetime = -1 -- Use a negative number to indicate that the lifetime is infinite
+pewpew.new_baf(baf_x, baf_y, baf_angle, baf_speed, lifetime)
+
+local time = 0
+
+-- A function that will get called every game tick, which is 30 times per seconds.
+function level_tick()
+  -- Stop the game if the player is dead.
+  local conf = pewpew.get_player_configuration(player_index)
+  if conf["has_lost"] == true then
+    pewpew.stop_game()
+  end
+end
+
+-- Register the `level_tick` function to be called at every game tick.
+pewpew.add_update_callback(level_tick)

content/levels/sample_simple_level/manifest.json

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+{
+  "name":"Sample: Simple level",
+  "descriptions":["Simple example that does next to nothing."],
+  "entry_point":"level.lua"
+}

content/levels/sample_simple_level/square500x500_graphic.lua

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+meshes = {
+  {
+    vertexes = {{0,0}, {500,0}, {500,500}, {0,500}},
+    colors = {0xffffffff, 0xffff00ff, 0xff00ffff, 0x00ff0000},
+    segments = {{0,1,2,3,0}}
+  }
+}

content/levels/sample_walls/graphics.lua

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+meshes = {
+  {
+    vertexes = {{0,0}, {500,0}, {500,500}, {0,500}, {100,200}, {400,200}, {200,100}, {400,300}},
+    colors = {0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xff0000ff, 0xff0000ff, 0xff0000ff, 0xff0000ff},
+    segments = {{0,1,2,3,0}, {4,5}, {6,7}}
+  }
+}

content/levels/sample_walls/level.lua

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+-- Set how large the level will be.
+pewpew.set_level_size(500fx, 500fx)
+
+-- Create an entity at position (0,0) that will hold the background mesh.
+local background = pewpew.new_customizable_entity(0fx, 0fx)
+pewpew.customizable_entity_set_mesh(background, "/dynamic/graphics.lua", 0)
+
+-- Create the walls.
+pewpew.add_wall(100fx, 200fx, 400fx, 200fx)
+pewpew.add_wall(200fx, 100fx, 400fx, 300fx)
+
+-- Create the player's ship.
+local player_x = 250fx
+local player_y = 250fx
+local player_index = 0 -- there is only one player
+pewpew.new_player_ship(player_x, player_y, player_index)

content/levels/sample_walls/manifest.json

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+{
+  "name":"Sample: Walls",
+  "descriptions":["This level contains 2 extra walls."],
+  "entry_point":"level.lua"
+}