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