horde mode initial commit

2026-08-12 10:00:50 +02:00 · 2026-08-02 21:01:11 -04:00
parent 2ce44586c2
commit c0c180fd01
18 changed files with 3184 additions and 12 deletions
@@ -0,0 +1,480 @@
+-- HORDE MODE: the handgun.
+--
+-- A voxel model in the player's right hand, authored here in METRES the
+-- way lib/Pokedex authors the device in the left one -- because the VR
+-- mapping's scale is what turns metres into world pixels, a mesh built
+-- this way is the right size in the hand at every scale the mod has, and
+-- the same mesh serves the flat screen's view model.
+--
+-- IN VR the gun rides the tracked right hand through VRRig.propMatrix,
+-- pointed by the runtime's AIM pose where one exists (the pose a runtime
+-- defines as "where the user is pointing") and by the grip pose where it
+-- does not. You aim it by pointing it. The iron sights are real geometry,
+-- and lining them up is how you shoot accurately, because the shot is
+-- traced down the model's own barrel axis.
+--
+-- ON THE FLAT SCREEN there is no hand to track, so the gun is carried by
+-- the camera: a model matrix built from the first-person eye and its yaw
+-- and pitch, with the gun hanging at the hip until the player aims. AIM
+-- DOWN SIGHTS slides it to the centre of the screen with the sight line
+-- ON the eye axis -- the model is authored with its rear notch at the
+-- origin precisely so that offset is (0, 0, forward) -- and narrows the
+-- field of view, which is the whole of what aiming does here.
+--
+-- THE SHOT IS A RAY, traced the same way in both modes: march it in world
+-- pixels, let terrain height stop it (a wall is a tall cell, so a cell
+-- whose ground is above the ray's height is a wall the bullet hits), and
+-- test every live mob against it as a standing cylinder. Nearest wins,
+-- and a hit above the shoulder line counts double.
+
+-- the mod namespace (see main.lua): V.require loads a sibling module
+local V = ...
+
+local Mat4 = V.require("Mat4")
+local Voxel3D = V.require("Voxel3D")
+local VRRig = V.require("VRRig")
+local FirstPerson = V.require("FirstPerson")
+local Horde = V.require("Horde")
+local HordeSfx = V.require("HordeSfx")
+
+local HordeGun = {}
+
+-- ------- tuning
+
+HordeGun.MAG = 8
+HordeGun.RELOAD_TIME = 1.5
+HordeGun.FIRE_COOLDOWN = 0.17      -- semi-auto, and it fits the reload clicks
+HordeGun.RANGE = 220               -- world pixels: about fourteen cells
+HordeGun.HIT_RADIUS = 6            -- a person is about twelve pixels wide
+HordeGun.ADS_TIME = 0.13
+HordeGun.ADS_FOV = math.rad(40)
+
+-- Where the gun sits relative to the EYE, in metres, hip and aimed. The
+-- model's own origin is its rear sight notch, so the aimed offset is a
+-- pure push forward: nothing to line up, it is already lined up.
+HordeGun.HIP = { -0.115, -0.125, 0.30 }
+HordeGun.ADS = { 0, -0.002, 0.34 }
+
+-- and where it sits relative to the tracked hand, in metres
+HordeGun.HAND_OFFSET = { 0, 0.02, 0.03 }
+HordeGun.HAND_TILT = -math.pi / 2   -- lay the barrel along the controller
+
+-- ------- the model
+--
+-- One voxel is 8mm, so the pistol below comes out about 18cm long -- a
+-- compact service automatic. Authored around the REAR SIGHT NOTCH at the
+-- origin, barrel down +Z, up +Y. (+X is the viewer's LEFT: the world runs
+-- +X east and +Z south, so a body facing +Z has its right hand toward
+-- -X, which is why the hip offset's x is negative.)
+
+local VOX = 0.008
+
+local COLORS = {
+  { 60, 62, 72 },      -- 1 slide
+  { 30, 31, 38 },      -- 2 frame / shadowed
+  { 46, 40, 40 },      -- 3 grip
+  { 104, 108, 122 },   -- 4 highlight
+  { 248, 240, 176 },   -- 5 sight dot
+  { 18, 18, 22 },      -- 6 bore
+  { 132, 136, 148 },   -- 7 trigger
+  { 255, 246, 196 },   -- 8 flash core
+  { 255, 168, 56 },    -- 9 flash edge
+}
+
+local paletteTex, bodyMesh, flashMesh = nil, nil, nil
+
+local function palette()
+  if paletteTex then return paletteTex end
+  if not (love.image and love.image.newImageData
+          and love.graphics and love.graphics.newImage) then return nil end
+  local ok, data = pcall(love.image.newImageData, #COLORS, 1)
+  if not (ok and data) then return nil end
+  for i, c in ipairs(COLORS) do
+    pcall(data.setPixel, data, i - 1, 0,
+          c[1] / 255, c[2] / 255, c[3] / 255, 1)
+  end
+  local built, img = pcall(love.graphics.newImage, data)
+  if not built then return nil end
+  pcall(img.setFilter, img, "nearest", "nearest")
+  paletteTex = img
+  return img
+end
+
+-- one solid box, in voxels, straight into the shared vertex format
+local function box(verts, indices, x, y, z, w, h, d, color)
+  local u = (color - 0.5) / #COLORS
+  local ox, oy, oz = x * VOX, y * VOX, z * VOX
+  local sx, sy, sz = w * VOX, h * VOX, d * VOX
+  for face = 1, 6 do
+    local corners = Voxel3D.FACE_CORNERS[face]
+    local shade = Voxel3D.FACE_SHADE[face]
+    local n = #verts / 4
+    for _, c in ipairs(corners) do
+      verts[#verts + 1] = { ox + c[1] * sx, oy + c[2] * sy, oz + c[3] * sz,
+                            u, 0.5, shade }
+    end
+    Voxel3D.pushQuad(indices, n)
+  end
+end
+
+local function buildBody()
+  if bodyMesh then return bodyMesh end
+  local v, i = {}, {}
+  -- slide, and the bore's dark eye at the end of it
+  box(v, i, -2, -5, -1, 4, 4, 18, 1)
+  box(v, i, -2, -2, -1, 4, 0.6, 18, 4)        -- the light along the top edge
+  box(v, i, -1, -4, 16.6, 2, 2, 0.6, 6)
+  -- frame under the slide, and the dust cover forward of the guard
+  box(v, i, -1.8, -8, 0.5, 3.6, 3.2, 12, 2)
+  -- the grip, three blocks stepping back: a raked butt without a hull
+  box(v, i, -1.8, -11, -1.2, 3.6, 3.2, 5, 3)
+  box(v, i, -1.8, -14, -2.6, 3.6, 3.2, 5, 3)
+  box(v, i, -1.8, -16.8, -3.8, 3.6, 3, 5, 2)
+  -- trigger guard: the bar under, the post in front
+  box(v, i, -1.4, -11.4, 3.6, 2.8, 1, 4.4, 2)
+  box(v, i, -1.4, -11.4, 7.4, 2.8, 3.4, 1, 2)
+  box(v, i, -0.9, -10.8, 4.6, 1.8, 2, 1, 7)   -- the trigger itself
+  -- IRON SIGHTS. Two rear posts with a notch between them at the origin,
+  -- one front post at the muzzle: look through the gap, put the front
+  -- post's dot in it, and the barrel is pointing where you are looking.
+  box(v, i, -2, -1, -0.2, 0.9, 1.3, 1.4, 2)
+  box(v, i, 1.1, -1, -0.2, 0.9, 1.3, 1.4, 2)
+  box(v, i, -1.95, -0.2, 0.3, 0.5, 0.5, 0.5, 5)
+  box(v, i, 1.45, -0.2, 0.3, 0.5, 0.5, 0.5, 5)
+  box(v, i, -0.45, -1, 15.2, 0.9, 1.5, 1, 2)
+  box(v, i, -0.3, 0.1, 15.4, 0.6, 0.6, 0.6, 5)
+  bodyMesh = Voxel3D.newMesh(v, i)
+  return bodyMesh
+end
+
+-- the muzzle flash: a bright cross of boxes off the bore, drawn for two
+-- frames after a shot and never lit by anything
+local function buildFlash()
+  if flashMesh then return flashMesh end
+  local v, i = {}, {}
+  box(v, i, -1.6, -4.6, 17.4, 3.2, 3.2, 2.6, 8)
+  box(v, i, -3.4, -3.8, 17.6, 6.8, 1.6, 1.8, 9)
+  box(v, i, -0.9, -6.4, 17.6, 1.8, 6.4, 1.8, 9)
+  box(v, i, -1.1, -4.1, 19.6, 2.2, 2.2, 2.2, 9)
+  flashMesh = Voxel3D.newMesh(v, i)
+  return flashMesh
+end
+
+-- ------- state
+
+local gun = {
+  ammo = HordeGun.MAG,
+  reloading = false,
+  reloadT = 0,
+  reloadStage = 0,
+  cooldown = 0,
+  ads = false,
+  adsBlend = 0,
+  kick = 0,
+  flash = 0,
+  frame = nil,        -- the VR hand's model matrix for this frame
+  ray = nil,          -- the VR aim ray in world space, if there is one
+}
+
+HordeGun.state = gun
+
+function HordeGun.reset()
+  gun.ammo = HordeGun.MAG
+  gun.reloading, gun.reloadT, gun.reloadStage = false, 0, 0
+  gun.cooldown, gun.kick, gun.flash = 0, 0, 0
+  gun.ads, gun.adsBlend = false, 0
+  gun.frame, gun.ray = nil, nil
+end
+
+-- how far into the aim the sights are, 0..1 -- read by the HUD (the
+-- crosshair goes away) and by the camera (the field of view narrows)
+function HordeGun.adsBlend()
+  return gun.adsBlend
+end
+
+function HordeGun.ammo()
+  return gun.ammo, HordeGun.MAG, gun.reloading
+end
+
+function HordeGun.setAds(on)
+  gun.ads = on and true or false
+end
+
+-- ------- the shot
+
+-- The eye and the direction it is looking, in world pixels. In VR this is
+-- the gun's own barrel (set by the VR frame); on the flat screen it is
+-- the camera, because the gun follows the camera exactly.
+local function ray(G)
+  if gun.ray then return gun.ray end
+  local ow = G and G.overworld
+  if not (ow and ow.player and ow.map) then return nil end
+  local p = ow.player
+  local gh = 0
+  pcall(function()
+    gh = V.require("VoxelScene").groundAt(ow.map, p.cellX, p.cellY) or 0
+  end)
+  local cp = math.cos(FirstPerson.pitch)
+  return {
+    p.px + 8, gh + FirstPerson.EYE_HEIGHT, p.py + 8,
+    math.sin(FirstPerson.yaw) * cp,
+    -math.sin(FirstPerson.pitch),
+    math.cos(FirstPerson.yaw) * cp,
+  }
+end
+
+-- How far the ray travels before terrain stops it. A wall in this world
+-- is a cell whose ground stands taller than the ray does where it crosses
+-- it, which is the same test for a fence you can shoot over, a building
+-- you cannot, and a doorway you can shoot through.
+local function occlusion(map, r)
+  local VoxelScene = V.require("VoxelScene")
+  local step = 3
+  local t = step
+  while t <= HordeGun.RANGE do
+    local x = r[1] + r[4] * t
+    local y = r[2] + r[5] * t
+    local z = r[3] + r[6] * t
+    local cx, cy = math.floor(x / 16), math.floor(z / 16)
+    if not map:inBounds(cx, cy) then return t end
+    local gh = 0
+    local ok, got = pcall(VoxelScene.groundAt, map, cx, cy)
+    if ok and got then gh = got end
+    if y < gh - 0.5 then return t end
+    if y < 0 then return t end
+    t = t + step
+  end
+  return HordeGun.RANGE
+end
+
+-- The nearest mob the ray reaches, and whether it caught the head.
+local function pick(G, r, maxT)
+  local Mobs = V.require("HordeMobs")
+  local VoxelScene = V.require("VoxelScene")
+  local ow = G and G.overworld
+  if not (ow and ow.map) then return nil end
+  local flat = r[4] * r[4] + r[6] * r[6]
+  if flat < 1e-6 then return nil end
+  local best, bestT, bestHead = nil, maxT, false
+  for _, e in ipairs(Mobs.list()) do
+    local npc = e.npc
+    if npc and not e.dead and e.mapId == ow.map.id then
+      local mx, mz = npc.px + 8, npc.py + 8
+      local t = ((mx - r[1]) * r[4] + (mz - r[3]) * r[6]) / flat
+      if t > 0 and t < bestT then
+        local hx = r[1] + r[4] * t - mx
+        local hz = r[3] + r[6] * t - mz
+        if hx * hx + hz * hz <= HordeGun.HIT_RADIUS * HordeGun.HIT_RADIUS then
+          local gh = 0
+          local ok, got = pcall(VoxelScene.groundAt, ow.map,
+                                npc.cellX, npc.cellY)
+          if ok and got then gh = got end
+          local y = r[2] + r[5] * t
+          if y >= gh - 2 and y <= gh + 17 then
+            best, bestT, bestHead = e, t, y >= gh + 11
+          end
+        end
+      end
+    end
+  end
+  return best, bestHead
+end
+
+-- Pull the trigger. Every input device funnels here (see Horde.install,
+-- FirstPerson's mouse and touch wraps, and VR.driveControls), so the
+-- cooldown below is also what keeps two devices reporting the same press
+-- from spending two rounds.
+function HordeGun.fire()
+  if not Horde.playing() then return false end
+  if gun.cooldown > 0 or gun.reloading then return false end
+  if gun.ammo <= 0 then
+    gun.cooldown = 0.35
+    HordeSfx.play(HordeSfx.DRY)
+    HordeGun.reload()
+    return false
+  end
+  local G = require("src.core.Game")
+  gun.ammo = gun.ammo - 1
+  gun.cooldown = HordeGun.FIRE_COOLDOWN
+  gun.kick = 1
+  gun.flash = 0.05
+  HordeSfx.shot()
+
+  local r = ray(G)
+  if r then
+    local ow = G.overworld
+    local maxT = ow and ow.map and occlusion(ow.map, r) or HordeGun.RANGE
+    local hit, head = pick(G, r, maxT)
+    if hit then
+      local Mobs = V.require("HordeMobs")
+      local result = Mobs.hit(hit, head and 2 or 1)
+      local s = Horde.session
+      if s then
+        s.hitMarker = 1
+        if result == "kill" and head then Horde.addScore(50) end
+      end
+    end
+  end
+  if gun.ammo <= 0 then HordeGun.reload() end
+  return true
+end
+
+function HordeGun.reload()
+  if gun.reloading or gun.ammo >= HordeGun.MAG then return false end
+  gun.reloading = true
+  gun.reloadT = 0
+  gun.reloadStage = 0
+  return true
+end
+
+-- ------- the frame
+
+function HordeGun.update(dt, live)
+  if not Horde.active then
+    FirstPerson.fovScale = 1        -- give the lens back on the way out
+    return
+  end
+  gun.cooldown = math.max(0, gun.cooldown - dt)
+  gun.kick = math.max(0, gun.kick - dt * 7)
+  gun.flash = math.max(0, gun.flash - dt)
+
+  local target = (gun.ads and live) and 1 or 0
+  local astep = dt / HordeGun.ADS_TIME
+  if gun.adsBlend < target then
+    gun.adsBlend = math.min(target, gun.adsBlend + astep)
+  else
+    gun.adsBlend = math.max(target, gun.adsBlend - astep)
+  end
+  -- the lens narrows with the sights. Half of what aiming does here is
+  -- the model coming to the centre of the screen; the other half is this
+  local e = gun.adsBlend * gun.adsBlend * (3 - 2 * gun.adsBlend)
+  FirstPerson.fovScale = 1 - (1 - HordeGun.ADS_FOV / FirstPerson.FOV) * e
+
+  if gun.reloading then
+    local was = gun.reloadT
+    gun.reloadT = gun.reloadT + dt
+    -- three clicks on their own clock: the magazine out, the fresh one
+    -- in, the slide home. Staged by time rather than animated frames so
+    -- the sound and the dip below stay in step at any frame rate.
+    local marks = { { 0.10, HordeSfx.MAG_OUT }, { 0.62, HordeSfx.MAG_IN },
+                    { 1.15, HordeSfx.RACK } }
+    for _, m in ipairs(marks) do
+      if was < m[1] and gun.reloadT >= m[1] then HordeSfx.play(m[2]) end
+    end
+    if gun.reloadT >= HordeGun.RELOAD_TIME then
+      gun.reloading = false
+      gun.reloadT = 0
+      gun.ammo = HordeGun.MAG
+    end
+  end
+end
+
+-- ------- VR placement
+--
+-- Called from the VR frame with the same mapping the eyes got. `pose` is
+-- the tracked right hand -- the runtime's aim pose where it has one.
+
+function HordeGun.place(pose, pivot, anchor, scale, yaw)
+  if not (Horde.active and pose) then
+    HordeGun.clear()
+    return
+  end
+  local m = VRRig.propMatrix(pose, pivot, anchor, scale, yaw)
+  m = Mat4.mul(m, Mat4.translate(HordeGun.HAND_OFFSET[1],
+                                 HordeGun.HAND_OFFSET[2],
+                                 HordeGun.HAND_OFFSET[3]))
+  m = Mat4.mul(m, Mat4.rotateX(HordeGun.HAND_TILT))
+  -- the recoil, up and back along the gun's own axes
+  local k = gun.kick
+  if k > 0 then
+    m = Mat4.mul(m, Mat4.translate(0, 0, -0.05 * k))
+    m = Mat4.mul(m, Mat4.rotateX(-0.30 * k))
+  end
+  gun.frame = m
+
+  -- the barrel, in world pixels: the shot goes where the gun points, so
+  -- lining the sights up with an eye is what aims it
+  local o = { m[4], m[8], m[12] }
+  local dx, dy, dz = m[3], m[7], m[11]        -- the model's +Z column
+  local len = math.sqrt(dx * dx + dy * dy + dz * dz)
+  if len > 1e-6 then
+    gun.ray = { o[1], o[2], o[3], dx / len, dy / len, dz / len }
+  else
+    gun.ray = nil
+  end
+end
+
+function HordeGun.clear()
+  gun.frame, gun.ray = nil, nil
+end
+
+-- ------- drawing
+--
+-- Runs inside VoxelScene's drawScene, once per eye in VR and once per
+-- frame flat, after the world -- so the gun composites with real depth
+-- and leaning it into a wall occludes honestly.
+
+-- Should the gun be drawn at all this frame? Keyed on the first-person
+-- rig's own IDENTITY rather than on the rung's number, because a staged
+-- VR battle places a camera through the same seam and the gun has no
+-- business in it.
+function HordeGun.visible()
+  if not Horde.active then return false end
+  if gun.frame then return true end
+  return FirstPerson.cardBlend() > 0.35
+end
+
+-- The flat screen's view model matrix: carried by the camera, offset to
+-- the hip or the sight line, with the recoil on top.
+local function flatModel()
+  local cam = Voxel3D.camera
+  local eye = cam and cam.eye
+  if not eye then return nil end
+  local a = gun.adsBlend
+  a = a * a * (3 - 2 * a)
+  local hip, ads = HordeGun.HIP, HordeGun.ADS
+  local ox = hip[1] + (ads[1] - hip[1]) * a
+  local oy = hip[2] + (ads[2] - hip[2]) * a
+  local oz = hip[3] + (ads[3] - hip[3]) * a
+  -- the reload dip: the gun swings down and out of the shot while the
+  -- hands are busy, easing back as the slide comes home
+  if gun.reloading then
+    local t = math.min(1, gun.reloadT / HordeGun.RELOAD_TIME)
+    local dip = math.sin(math.min(1, t * 1.15) * math.pi)
+    oy = oy - 0.09 * dip
+    ox = ox - 0.03 * dip
+  end
+  local k = gun.kick
+  oz = oz - 0.045 * k
+
+  local m = Mat4.translate(eye[1], eye[2], eye[3])
+  m = Mat4.mul(m, Mat4.rotateY(FirstPerson.yaw))
+  m = Mat4.mul(m, Mat4.rotateX(FirstPerson.pitch - 0.34 * k))
+  m = Mat4.mul(m, Mat4.scale(VRRig.FP_SCALE, VRRig.FP_SCALE, VRRig.FP_SCALE))
+  m = Mat4.mul(m, Mat4.translate(ox, oy, oz))
+  if gun.reloading then
+    local t = math.min(1, gun.reloadT / HordeGun.RELOAD_TIME)
+    m = Mat4.mul(m, Mat4.rotateX(-0.55 * math.sin(math.min(1, t * 1.15)
+                                                  * math.pi)))
+  end
+  return m
+end
+
+function HordeGun.draw()
+  if not HordeGun.visible() then return end
+  local model = gun.frame or flatModel()
+  if not model then return end
+  local body, pal = buildBody(), palette()
+  if not (body and pal) then return end
+  Voxel3D.draw(body, pal, model)
+  if gun.flash > 0 then
+    local flash = buildFlash()
+    if flash then Voxel3D.draw(flash, pal, model) end
+  end
+end
+
+function HordeGun.invalidate()
+  paletteTex, bodyMesh, flashMesh = nil, nil, nil
+end
+
+return HordeGun