minetest.register_decoration({
  deco_type = "simple",
  place_on = {"pyutest_core:grass_block"},
  sidelen = 16,
  fill_ratio = 0.009,
  biomes = {"forest", "grassland"},
  y_max = PyuTestCore_BiomeTops.grassland,
  y_min = 1,
  decoration = {"pyutest_core:flower", "pyutest_core:flower2", "pyutest_core:flower3", "pyutest_core:flower4"}
})

minetest.register_decoration({
  deco_type = "simple",
  place_on = {"pyutest_core:grass_block"},
  sidelen = 16,
  fill_ratio = 0.048,
  biomes = {"grassland"},
  y_max = PyuTestCore_BiomeTops.grassland,
  y_min = 1,
  decoration = "pyutest_core:grass_plant"
})

minetest.register_decoration({
  deco_type = "simple",
  place_on = {"pyutest_core:grass_block"},
  sidelen = 16,
  fill_ratio = 0.0018,
  biomes = {"grassland"},
  y_max = PyuTestCore_BiomeTops.grassland,
  y_min = 1,
  decoration = "pyutest_core:haybale_block"
})

minetest.register_decoration({
  deco_type = "simple",
  place_on = {"pyutest_core:dirt_block", "pyutest_core:sand_block"},
  sidelen = 16,
  fill_ratio = 0.019,
  biomes = {"wasteland", "desert"},
  y_max = PyuTestCore_BiomeTops.grassland,
  y_min = 1,
  decoration = "pyutest_core:deadbush"
})

minetest.register_decoration({
  deco_type = "schematic",
  place_on = {"pyutest_core:grass_block"},
  sidelen = 16,
  fill_ratio = 0.004,
  biomes = {"forest"},
  y_max = PyuTestCore_BiomeTops.grassland,
  y_min = 1,
  schematic = PyuTestCore.get_schem_path("tree"),
  rotation = "random",
  flags = "place_center_x, place_center_z"
})

minetest.register_decoration({
  deco_type = "schematic",
  place_on = {"pyutest_core:grass_block"},
  sidelen = 16,
  fill_ratio = 0.004,
  biomes = {"forest"},
  y_max = PyuTestCore_BiomeTops.grassland,
  y_min = 1,
  schematic = PyuTestCore.get_schem_path("tree2"),
  rotation = "random",
  flags = "place_center_x, place_center_z"
})

-- turns out lsystems are not in minetest yet, maybe they will in 5.9.0?
-- minetest.register_decoration({
--   deco_type = "lsystem",
--   place_on = {"pyutest_core:grass_block"},
--   sidelen = 16,
--   fill_ratio = 0.004,
--   biomes = {"forest"},
--   y_max = PyuTestCore_BiomeTops.grassland,
--   y_min = 1,
--   treedef = {
--     axiom="FFFFFAFFBF",
--     rules_a="[&&&FFFFF&&FFFF][&&&++++FFFFF&&FFFF][&&&----FFFFF&&FFFF]",
--     rules_b="[&&&++FFFFF&&FFFF][&&&--FFFFF&&FFFF][&&&------FFFFF&&FFFF]",
--     trunk="pyutest_core:wooden_block",
--     leaves="pyutest_core:leaves_block",
--     angle=30,
--     iterations=2,
--     random_level=0,
--     trunk_type="single",
--     thin_branches=true,
--     fruit = "pyutest_core:leaves_block",
--     fruit_chance = 10
--   }
-- })

minetest.register_decoration({
  deco_type = "schematic",
  place_on = {"pyutest_core:mycelium_block"},
  sidelen = 16,
  fill_ratio = 0.003,
  biomes = {"mushroom_fields"},
  y_max = PyuTestCore_BiomeTops.mushroom_fields,
  y_min = 1,
  schematic = PyuTestCore.get_schem_path("mushroom"),
  rotation = "random",
  flags = "place_center_x, place_center_z"
})