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VoxeLibre/mods/CORE/mcl_particles/init.lua

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Lua
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mcl_particles = {}
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-- Table of particlespawner IDs on a per-node hash basis
-- Keys: node position hashes
-- Values: Tables of particlespawner IDs (each node pos can have an arbitrary number of particlespawners)
local particle_nodes = {}
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-- Node particles can be disabled via setting
local node_particles_allowed = minetest.settings:get("mcl_node_particles") or "none"
local levels = {
high = 3,
medium = 2,
low = 1,
none = 0,
}
allowed_level = levels[node_particles_allowed]
if not allowed_level then
allowed_level = levels["none"]
end
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-- Add a particlespawner that is assigned to a given node position.
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-- * pos: Node positon. MUST use integer values!
-- * particlespawner_definition: definition for minetest.add_particlespawner
-- * level: detail level of particles. "high", "medium", "low" or "none". High detail levels are for
-- CPU-demanding particles, like smoke of fire (which occurs frequently)
-- NOTE: All particlespawners are automatically removed on shutdown.
-- Returns particlespawner ID on succcess and nil on failure
function mcl_particles.add_node_particlespawner(pos, particlespawner_definition, level)
if allowed_level == 0 or levels[level] > allowed_level then
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return
end
local poshash = minetest.hash_node_position(pos)
if not poshash then
return
end
local id = minetest.add_particlespawner(particlespawner_definition)
if id == -1 then
return
end
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if not particle_nodes[poshash] then
particle_nodes[poshash] = {}
end
table.insert(particle_nodes[poshash], id)
return id
end
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-- Deletes all particlespawners that are assigned to a node position.
-- If no particlespawners exist for this position, nothing happens.
-- pos: Node positon. MUST use integer values!
-- Returns true if particlespawner could be removed and false if not
function mcl_particles.delete_node_particlespawners(pos)
if allowed_level == 0 then
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return false
end
local poshash = minetest.hash_node_position(pos)
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local ids = particle_nodes[poshash]
if ids then
for i=1, #ids do
minetest.delete_particlespawner(ids[i])
end
particle_nodes[poshash] = nil
return true
end
return false
end
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-- 3 exptime variants because the animation is not tied to particle expiration time.
-- 3 colorized variants to imitate minecraft's
local smoke_pdef_cached = {}
function mcl_particles.spawn_smoke(pos, name, smoke_pdef_base)
local min = math.min
local new_minpos = vector.add(pos, smoke_pdef_base.minrelpos)
local new_maxpos = vector.add(pos, smoke_pdef_base.maxrelpos)
-- populate the cache
if smoke_pdef_cached[name] then
for i, smoke_pdef in ipairs(smoke_pdef_cached[name]) do
smoke_pdef.minpos = new_minpos
smoke_pdef.maxpos = new_maxpos
mcl_particles.add_node_particlespawner(pos, smoke_pdef, "high")
end
-- cache already populated
else
smoke_pdef_cached[name] = {}
local smoke_pdef = table.copy(smoke_pdef_base)
smoke_pdef.amount = smoke_pdef_base.amount / 9
smoke_pdef.time = 0
smoke_pdef.animation = {
type = "vertical_frames",
aspect_w = 8,
aspect_h = 8,
-- length = 3 exptime variants
}
smoke_pdef.collisiondetection = true
smoke_pdef.minpos = new_minpos
smoke_pdef.maxpos = new_maxpos
-- the last frame plays for 1/8 * N seconds, so we can take advantage of it
-- to have varying exptime for each variant.
local exptimes = { 0.175, 0.375, 1.0 }
local colorizes = { "199", "209", "243" } -- round(78%, 82%, 90% of 256) - 1
for _,exptime in ipairs(exptimes) do
for _,colorize in ipairs(colorizes) do
smoke_pdef.maxexptime = exptime * smoke_pdef_base.maxexptime
smoke_pdef.animation.length = exptime + 0.1
-- minexptime must be set such that the last frame is actully rendered,
-- even if its very short. Larger exptime -> larger range
smoke_pdef.minexptime = min(exptime, (7.0/8.0 * (exptime + 0.1) + 0.1))
smoke_pdef.texture = "mcl_particles_smoke_anim.png^[colorize:#000000:" ..colorize
mcl_particles.add_node_particlespawner(pos, smoke_pdef, "high")
table.insert(smoke_pdef_cached[name], table.copy(smoke_pdef))
end
end
end
end