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DramaticShapeVoxelMod/lib/StadiumFx.lua
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DramaticShape 74cc08f1bf dramatic stadium
2026-08-04 10:43:35 -04:00

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-- STADIUM battles: the generated fire and gas stand-ins.
--
-- A port of model_extract/pipeline/effects.py, plus the bind-pose measurement
-- build.py sizes them against.
--
-- IMPORTANT: nothing here is extracted game data. The real tail flame, mane
-- fire and gas are drawn by procedural callbacks that live in a different
-- fragment -- geo command 0x08 records an attachment point and
-- func_80014A60 calls node->unk_10, and the model file supplies only two
-- empty display lists plus zeroed scratch buffers for it to fill. Those
-- callbacks have not been ported, so the models genuinely contain no flame
-- mesh and no flame texture: Charmander's texture set is eyes, claws, teeth
-- and skin.
--
-- What follows is an ORIGINAL, procedurally generated replacement -- looping
-- flipbook noise on a pair of crossed quads, anchored to the exact bone the
-- callback hangs off so it sits where the real effect would and follows the
-- animation. Seeds derive from the species number, so a given Pokemon always
-- generates the same flame.
--
-- Which species get one is the game's own grouping: every species sharing a
-- callback shares an effect.
--
-- 0x810000D8 Charmander, Charmeleon, Charizard, Magmar, Moltres tail flame
-- 0x81000108 Ponyta, Rapidash, Moltres's wings small flame
-- 0x810000E0 Gastly (only) gas cloud
-- the mod namespace (see main.lua): V.require loads a sibling module
local V = ...
local StadiumFx = {}
local floor = math.floor
local sqrt = math.sqrt
local sin, cos = math.sin, math.cos
local char = string.char
local concat = table.concat
local pi = math.pi
local FIRE_TAIL = 0x810000D8
local FIRE_SMALL = 0x81000108
local AURA = 0x810000E0
-- Desired size as a fraction of the model's world-space height: length, width.
StadiumFx.SIZES = {
fire_tail = { 0.40, 0.22 },
fire_small = { 0.075, 0.042 },
gas = { 1.05, 1.05 },
}
-- ------- 32-bit exclusive-or, in arithmetic
--
-- The generator below is an xorshift, so it needs a real 32-bit xor and a
-- real 32-bit wrap. Written out rather than taken from LuaJIT's `bit`, which
-- works in SIGNED 32-bit and would need converting back on every step -- see
-- the same note in StadiumFragment.
local function bxor32(a, b)
local r, p = 0, 1
for _ = 1, 32 do
local x, y = a % 2, b % 2
if x ~= y then r = r + p end
a, b, p = floor(a / 2), floor(b / 2), p * 2
end
return r
end
-- ------- deterministic noise
local Rng = {}
Rng.__index = Rng
local function newRng(seed)
local s = seed % 0x100000000
if s == 0 then s = 0x9E3779B9 end
return setmetatable({ s = s }, Rng)
end
function Rng:next()
local x = self.s
x = bxor32(x, (x % 0x80000) * 0x2000) -- x ^= (x << 13)
x = bxor32(x, floor(x / 0x20000)) -- x ^= x >> 17
x = bxor32(x, (x % 0x8000000) * 0x20) -- x ^= (x << 5)
self.s = x % 0x100000000
return self.s
end
function Rng:unit()
return self:next() / 0x100000000
end
-- A w-by-h lattice of unit noise, consumed row by row so the sequence -- and
-- therefore the texture -- is reproducible.
local function lattice(rng, w, h)
local g = {}
for y = 1, h do
local row = {}
for x = 1, w do row[x] = rng:unit() end
g[y] = row
end
return g
end
local function smooth(t)
return t * t * (3 - 2 * t)
end
-- Bilinear value noise on a torus, so the field tiles in both axes.
local function sample(grid, x, y)
local h = #grid
local w = #grid[1]
local fx0, fy0 = floor(x), floor(y)
local x0, y0 = fx0 % w, fy0 % h
local x1, y1 = (x0 + 1) % w, (y0 + 1) % h
local fx, fy = smooth(x - fx0), smooth(y - fy0)
local r0, r1 = grid[y0 + 1], grid[y1 + 1]
local a = r0[x0 + 1] + (r0[x1 + 1] - r0[x0 + 1]) * fx
local b = r1[x0 + 1] + (r1[x1 + 1] - r1[x0 + 1]) * fx
return a + (b - a) * fy
end
-- Sum octaves of tileable noise.
local function fbm(grids, x, y, scale)
local total, amp, norm = 0.0, 1.0, 0.0
for i = 1, #grids do
local f = scale * 2 ^ (i - 1)
total = total + sample(grids[i], x * f, y * f) * amp
norm = norm + amp
amp = amp * 0.5
end
return total / norm
end
-- Intensity -> RGBA, through a piecewise ramp.
local function ramp(stops, t)
if t < 0.0 then t = 0.0 elseif t > 1.0 then t = 1.0 end
for i = 1, #stops - 1 do
local a, b = stops[i], stops[i + 1]
if t <= b[1] then
local k = 0.0
if b[1] ~= a[1] then k = (t - a[1]) / (b[1] - a[1]) end
return floor(a[2] + (b[2] - a[2]) * k), floor(a[3] + (b[3] - a[3]) * k),
floor(a[4] + (b[4] - a[4]) * k), floor(a[5] + (b[5] - a[5]) * k)
end
end
local last = stops[#stops]
return last[2], last[3], last[4], last[5]
end
local FIRE_RAMP = {
{ 0.00, 0, 0, 0, 0 },
{ 0.30, 120, 24, 8, 90 },
{ 0.52, 226, 78, 16, 205 },
{ 0.74, 252, 176, 44, 245 },
{ 1.00, 255, 246, 214, 255 },
}
local GAS_RAMP = {
{ 0.00, 0, 0, 0, 0 },
{ 0.34, 52, 26, 78, 70 },
{ 0.60, 96, 52, 140, 140 },
{ 0.82, 148, 96, 196, 190 },
{ 1.00, 208, 176, 236, 215 },
}
local TRANSPARENT = char(0, 0, 0, 0)
-- An upward-advected noise plume. Scrolling by an exact multiple of the
-- lattice over the frame count is what makes the loop seamless.
local function fireFrames(seed, w, h, frames, wisp)
wisp = wisp or 1.0
local rng = newRng(seed)
local grids = { lattice(rng, 8, 8), lattice(rng, 16, 16),
lattice(rng, 32, 32) }
local out = {}
for f = 0, frames - 1 do
local t = f / frames
local buf = {}
for i = 1, w * h do buf[i] = TRANSPARENT end
for y = 0, h - 1 do
local v = y / (h - 1) -- 0 at the base, 1 at the tip
-- plume envelope: wide and hot at the base, pinched at the tip
local taper = 1.0 - v
if taper < 0.0 then taper = 0.0 end
taper = taper ^ 0.42
for x = 0, w - 1 do
local u = (x / (w - 1)) * 2 - 1 -- -1 .. 1 across the flame
local denom = taper * 0.95
if denom < 0.10 then denom = 0.10 end
local radial = 1.0 - (u < 0 and -u or u) / denom
if radial > 0 then
radial = radial ^ 0.7
local n = fbm(grids, x / w, (y / h) - t, 3.0)
local lick = 0.55 + 0.75 * (n - 0.5) * wisp
local inten = radial * (0.55 + 0.8 * taper) * lick
inten = inten - 0.16 * v -- cool towards the tip
if inten > 0.02 then
local r, g, b, a = ramp(FIRE_RAMP, inten)
-- +Y in texture space is up
buf[(h - 1 - y) * w + x + 1] = char(r, g, b, a)
end
end
end
end
out[f + 1] = concat(buf)
end
return w, h, out
end
-- Slow swirling haze that fades out towards the rim.
local function gasFrames(seed, w, h, frames)
local rng = newRng(seed)
local grids = { lattice(rng, 8, 8), lattice(rng, 16, 16),
lattice(rng, 32, 32) }
local out = {}
for f = 0, frames - 1 do
local t = f / frames
local buf = {}
for i = 1, w * h do buf[i] = TRANSPARENT end
local ang = t * 2 * pi
local ca, sa = cos(ang), sin(ang)
for y = 0, h - 1 do
for x = 0, w - 1 do
local dx = (x / (w - 1)) * 2 - 1
local dy = (y / (h - 1)) * 2 - 1
local d = sqrt(dx * dx + dy * dy)
if d < 1.0 then
local falloff = (1.0 - d) ^ 0.85
-- rotate the sample point so the haze churns without popping
local sx = dx * ca - dy * sa
local sy = dx * sa + dy * ca
local n = fbm(grids, sx * 0.5 + 0.5, sy * 0.5 + 0.5 - t, 2.5)
local inten = falloff * (0.78 + 1.30 * (n - 0.44))
if inten > 0.03 then
local r, g, b, a = ramp(GAS_RAMP, inten)
buf[y * w + x + 1] = char(r, g, b, a)
end
end
end
end
out[f + 1] = concat(buf)
end
return w, h, out
end
-- Two quads at right angles, so the effect reads from any angle. `axis` picks
-- which bone-local direction the quad grows along: bone-local +X runs down the
-- limb, so a flame laid out along X comes out lying sideways, and 'y' is that
-- same quad turned a quarter left about Z, which stands it up. `centred`
-- straddles the origin instead of growing from it.
local function crossedQuads(bone, length, width, axis, centred)
local pos, uv, nrm, skin, idx = {}, {}, {}, {}, {}
local ST = { { 0, 0 }, { 1, 0 }, { 1, 1 }, { 0, 1 } }
local nv, ni = 0, 0
for q = 0, 1 do
local base = nv
for k = 1, 4 do
local s, t = ST[k][1], ST[k][2]
local a = (s - 0.5) * width
local b = centred and (t - 0.5) * length or t * length
local px, py, pz
if axis == "x" then
if q == 0 then px, py, pz = b, a, 0.0 else px, py, pz = b, 0.0, a end
else -- (x, y) -> (-y, x)
if q == 0 then px, py, pz = -a, b, 0.0 else px, py, pz = 0.0, b, a end
end
pos[nv * 3 + 1], pos[nv * 3 + 2], pos[nv * 3 + 3] = px, py, pz
uv[nv * 2 + 1], uv[nv * 2 + 2] = s, 1.0 - t
if q == 0 then
nrm[nv * 3 + 1], nrm[nv * 3 + 2], nrm[nv * 3 + 3] = 0.0, 0.0, 1.0
else
nrm[nv * 3 + 1], nrm[nv * 3 + 2], nrm[nv * 3 + 3] = 1.0, 0.0, 0.0
end
skin[nv + 1] = bone
nv = nv + 1
end
idx[ni + 1], idx[ni + 2], idx[ni + 3] = base, base + 1, base + 2
idx[ni + 4], idx[ni + 5], idx[ni + 6] = base, base + 2, base + 3
ni = ni + 6
end
return { pos = pos, uv = uv, nrm = nrm, skin = skin, nverts = nv,
idx = idx, nidx = ni }
end
-- ------- the bind pose these are sized against
--
-- build.py's bind_extent, kept in its own 4x4 column-major convention rather
-- than folded into StadiumBuild's 3x4 walk. The two agree -- they are the
-- same skeleton -- but the effect sizes come out of THIS one's per-bone scale
-- measurement, and rewriting it into the other convention is exactly the kind
-- of change that moves a byte without anyone noticing.
local function trs(t, r, s)
local function S(v) return sin(v / 32768 * pi) end
local function C(v) return cos(v / 32768 * pi) end
local sx, cx = S(r[1]), C(r[1])
local sy, cy = S(r[2]), C(r[2])
local sz, cz = S(r[3]), C(r[3])
return { cy * cz * s[1], cy * sz * s[1], -sy * s[1], 0,
(sx * sy * cz - cx * sz) * s[2], (sx * sy * sz + cx * cz) * s[2],
sx * cy * s[2], 0,
(cx * sy * cz + sx * sz) * s[3], (cx * sy * sz - sx * cz) * s[3],
cx * cy * s[3], 0,
t[1], t[2], t[3], 1 }
end
local function mul(a, b)
local r = {}
for c = 0, 3 do
for i = 1, 4 do
r[c * 4 + i] = a[i] * b[c * 4 + 1] + a[4 + i] * b[c * 4 + 2]
+ a[8 + i] * b[c * 4 + 3] + a[12 + i] * b[c * 4 + 4]
end
end
return r
end
-- (height of the bind pose, per-bone local scale). Height rather than the
-- largest dimension: sizing off the max would scale Moltres's flames to its
-- wingspan.
function StadiumFx.bindExtent(data)
local root = trs({ 0, 0, 0 }, { 0, 0, 0 }, data.rootScale)
local acc, uns, mats = {}, {}, {}
for i = 1, #data.bones do
local b = data.bones[i]
local p = b.parent
local pa = (p >= 0) and acc[p + 1] or { 1.0, 1.0, 1.0 }
local pu = (p >= 0) and uns[p + 1] or root
local u = mul(pu, trs({ b.t[1] * pa[1], b.t[2] * pa[2], b.t[3] * pa[3] },
b.r, { 1, 1, 1 }))
local a = { pa[1] * b.s[1], pa[2] * b.s[2], pa[3] * b.s[3] }
local m = {}
for k = 1, 16 do m[k] = u[k] end
for k = 1, 4 do
m[k] = m[k] * a[1]
m[4 + k] = m[4 + k] * a[2]
m[8 + k] = m[8 + k] * a[3]
end
acc[i], uns[i], mats[i] = a, u, m
end
local lo = { 1e9, 1e9, 1e9 }
local hi = { -1e9, -1e9, -1e9 }
for _, prim in ipairs(data.prims) do
local pos, skin = prim.pos, prim.skin
for i = 1, prim.nverts do
local m = mats[skin[i] + 1]
if m then
local x, y, z = pos[i * 3 - 2], pos[i * 3 - 1], pos[i * 3]
local wx = m[1] * x + m[5] * y + m[9] * z + m[13]
local wy = m[2] * x + m[6] * y + m[10] * z + m[14]
local wz = m[3] * x + m[7] * y + m[11] * z + m[15]
if wx < lo[1] then lo[1] = wx end
if wy < lo[2] then lo[2] = wy end
if wz < lo[3] then lo[3] = wz end
if wx > hi[1] then hi[1] = wx end
if wy > hi[2] then hi[2] = wy end
if wz > hi[3] then hi[3] = wz end
end
end
end
local extent = (lo[1] <= hi[1]) and (hi[2] - lo[2]) or 1.0
-- how much each bone scales its own local space, so an effect can divide it
-- back out and come out the size it asked for wherever it hangs
local scales = {}
for i = 1, #mats do
local m = mats[i]
scales[i] = sqrt(m[1] * m[1] + m[2] * m[2] + m[3] * m[3])
end
return extent, scales
end
-- ------- what a species gets
-- Returns a list of { kind, bone, geo, w, h, frames }, or an empty list.
function StadiumFx.buildFor(species, fx, extent, boneScale)
local out = {}
for _, node in ipairs(fx) do
local cb, bone = node.callback, node.bone
if bone >= 0 and bone < #boneScale then
local k = boneScale[bone + 1]
if k == 0 then k = 1.0 end
if cb == FIRE_TAIL then
local fl, fw = StadiumFx.SIZES.fire_tail[1], StadiumFx.SIZES.fire_tail[2]
local w, h, fr = fireFrames(species * 7919 + 1, 32, 64, 8)
out[#out + 1] = { kind = "fire", bone = bone, w = w, h = h, frames = fr,
geo = crossedQuads(bone, extent * fl / k,
extent * fw / k, "y", false) }
elseif cb == FIRE_SMALL then
local fl, fw = StadiumFx.SIZES.fire_small[1],
StadiumFx.SIZES.fire_small[2]
local w, h, fr = fireFrames(species * 6271 + bone, 24, 40, 8, 1.25)
out[#out + 1] = { kind = "fire", bone = bone, w = w, h = h, frames = fr,
geo = crossedQuads(bone, extent * fl / k,
extent * fw / k, "y", false) }
elseif cb == AURA and species == 92 then -- Gastly only
local fl, fw = StadiumFx.SIZES.gas[1], StadiumFx.SIZES.gas[2]
local w, h, fr = gasFrames(species * 5237 + 3, 48, 48, 10)
out[#out + 1] = { kind = "gas", bone = bone, w = w, h = h, frames = fr,
geo = crossedQuads(bone, extent * fl / k,
extent * fw / k, "y", true) }
end
end
end
return out
end
-- Append the generated prims and their flipbook textures to a model, exactly
-- as build.py's attach_effects does. Returns how many were made.
function StadiumFx.attach(data, species)
if not (data.fx and #data.fx > 0) then return 0 end
local extent, boneScale = StadiumFx.bindExtent(data)
local made = StadiumFx.buildFor(species, data.fx, extent, boneScale)
for _, e in ipairs(made) do
local first = #data.textures -- 0-based, as the file
for i = 1, #e.frames do
data.textures[first + i] = { index = -1, w = e.w, h = e.h,
generated = true, rgba = e.frames[i] }
end
local g = e.geo
local fxFrames = {}
for i = 1, #e.frames do fxFrames[i] = first + i - 1 end
data.prims[#data.prims + 1] = {
tex = first, cull = 0, texAnim = -1, texMap = nil,
generated = true, effect = e.kind,
blend = (e.kind == "fire") and "add" or "alpha",
fxFrames = fxFrames,
pos = g.pos, uv = g.uv, nrm = g.nrm, skin = g.skin, nverts = g.nverts,
idx = g.idx, nidx = g.nidx,
}
end
return #made
end
return StadiumFx
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