Merge pull request #51 from DramaticShape/back-sprite-transparency-fix

Back sprite transparency fix

CHANGELOG.md

@@ -1,5 +1,66 @@
 # Changelog
 
+## 1.4.1
+
+### Added
+
+- **Furniture through the building pipeline.** The band-table voxelizer
+  that models whole buildings from their own drawings (lib/Buildings.lua)
+  now reads interior furniture too, and the first four drawings are in:
+
+  - **F01, the starter-ball table in Oak's lab** -- the tabletop's 16
+    drawn rows lay flat over a 16px plot (1:1, the first template that
+    never cycles), the black/#555/black edge band folds into the slab's
+    own rim, and the base extrudes with its corner feet. Six voxels
+    tall, exactly the drawn elevation.
+  - **F03, the empty north table beside it** -- the same band table on a
+    grid two tiles narrower.
+  - **F02, the lab's computer desk** -- the first DESK-SET template: the
+    drawing segments into PARTS, each classified by the surface it
+    depicts. The monitor and the computer tower stand upright on the
+    desk wearing their own drawn tops as lids; the keyboards and the
+    mouse lie flat in front of them; the sheet of paper on the right
+    lies flat across the desk. Flat parts keep the drawing's own rule --
+    drawn row IS depth row, the same 1:1 the tabletop is drawn with --
+    so an object's height on the drawing is its position on the desk.
+    The Hall of Fame's recording machine is this drawing tile for tile
+    on the GYM atlas, and models identically for free.
+  - **F04, the Center PC** -- the desk-set read again: a Mac-style unit
+    with its screen and drive slot in relief, standing at the back of a
+    low white-topped desk with its keyboard lying at the front edge.
+    Eleven Pokemon Centers, plus the Indigo Plateau lobby, whose MART
+    tileset shares the atlas.
+
+  Two measurements had to stop being assumptions for furniture to fit
+  the pipeline: the GROUND LINE is now read off the drawing (a building
+  ends on the black threshold row it stands on; a table's legs stop two
+  rows short of theirs, and extruding against the grid floated them in
+  the air), and a template may name its PLOT (`depth`) when the matched
+  grid runs past it onto the walkable floor the legs merely stand on.
+  Both are identities for every existing building.
+
+- **The Center couch has a backrest.** The couch is drawn from above --
+  back-and-arm strip down the west side, cushions and seams on the east
+  -- and rendered as one seat-high box. The new `backrest` class raises
+  the drawn back strip to 12px over the 8px seat, in every Center and
+  the Celadon Hotel. The man sitting on it keeps his seat: the figure
+  anchor now scans under his card for the tallest authored upright (his
+  cushion) instead of reading the corner tile, which is the backrest
+  now.
+
+### Changed
+
+- **Sprites ride at the height the art actually stands.** Class heights
+  can now be overridden per tileset (a tileset entry's `heights`), and
+  DOJO's lab tables use it: they are drawn 6px tall, not the default
+  table's 12, so the starter balls sit exactly on the modelled tabletop
+  -- and the volume-built north tables drop to the same height, keeping
+  every table in the room level.
+- The Center PC's old rendering -- a 12px table box with the unit as a
+  flat standee on it -- retires wherever the F04 template stamps; the
+  pins stay only as the degradation path when the shape profile is
+  absent.
+
 ## 1.4.0
 
 ### Added
@@ -116,6 +177,72 @@
   ever lands half-way between two pixels and changing a wavelength moves the
   speed with it.
 
+- **AA, a new options row: OFF / 2X / 4X.** Everything else in this game is
+  flat art blitted at whole pixels. This mode's world is real geometry seen
+  through a perspective camera, and a polygon edge that lands at an angle
+  across the pixel grid is the one place where a hard stair-step is not a
+  stylistic choice -- a roof ridge, a ledge lip, a tree's silhouette against
+  the sky, the leaning card of a character. At the shallow rungs, where the
+  diorama reads most like a photograph of a model, they crawl as the camera
+  drifts.
+
+  The row is SUPERSAMPLING: the whole pass renders into a canvas larger than
+  the window and is folded back down at the end. The ladder is samples per
+  display pixel, so 2X is a canvas root-two wider and taller and 4X one
+  exactly twice the size -- an honest 2x2 box.
+
+  Two alternatives were tried against what this pass already is, and both
+  lost:
+
+  - **MSAA** would have taken the water with it. The reflections read the
+    frame's own depth buffer as a texture, and a multisampled depth
+    attachment is not something a fragment shader in this dialect can sample.
+    The row would have quietly switched the WATER row off.
+
+  - **An edge filter** (FXAA and its relatives) works from the finished
+    colour alone, so it would be guessing where the edges are out of one
+    sample per pixel -- inventing detail it never rendered, and unable to
+    tell a geometry edge from the boundary between two texels of a tileset.
+
+  Rendering larger has neither problem, and nothing in the frame had to be
+  taught about it: every pass already measures itself in the canvas it was
+  handed, so the sky's dither, the water's ray march, the shadow lookups and
+  the camera itself come out the same picture at a higher sample rate. It
+  antialiases the geometry, the alpha-cut outline of a sprite card, the
+  wireframe and the reflections at once, because none of them know it is
+  happening.
+
+  And it softens the ARTWORK with them, which is worth saying plainly. A
+  tileset texel out here is not a screen pixel, it is a quad in a perspective
+  view, and its boundary crosses the pixel grid at the same arbitrary angle a
+  roof ridge does -- so the fold averages across it exactly as it averages
+  across the ridge. That is what an honest extra sample says about that
+  pixel, and it is also the trade the row is: the diorama comes out smoother,
+  not sharper. Which is why it is a row and not something that is simply on.
+
+  Two things are quoted in DISPLAY pixels rather than canvas ones and are
+  multiplied up to match: the voxel wireframe's line width -- left alone it
+  would fold down to half a line, so turning the smoothing up would appear to
+  fade the grid out -- and the scale the overworld's FX closures draw at.
+
+  The fold is a shader rather than a scaled draw, because the void this pass
+  renders into is a transparent BLACK: averaging a straight-alpha edge against
+  it drags the colour toward black as well as toward transparent, and the
+  engine's composite then multiplies by that alpha a second time. Every
+  silhouette against the sky would have come out ringed with a dark fringe --
+  the exact artefact the row exists to remove. So the taps are premultiplied
+  before they are averaged and divided back out after.
+
+  The staged battle gets it too, on its own canvas: the arena is folded back
+  to the window's pixel size before the depth-of-field pass and the HUDs go
+  on, so the world is smoothed and the pics, panels and text box stay the
+  chunky GB art they are.
+
+  OFF by default, and **FULL neither sets it nor takes the row away** -- it
+  is the one row that is not a knob on the look but on what the look COSTS,
+  and only the player knows what their machine can carry. No hotkey, for the
+  same reason: it is set once, not flicked while walking.
+
 
 ### Changed
 
@@ -216,6 +343,36 @@
   depth16 as the floor every GLES3 device can read. Refused all four, the
   reflections are lost and nothing else, exactly as before.
 
+- **Under BACK SPRITES some of your own Pokemon were see-through -- Pikachu,
+  Seel, Dewgong, Chansey, Jigglypuff -- with the arena showing through the
+  middle of them.** Those back pics are drawn as OUTLINES: everything inside
+  the ink is the lightest shade, the decoder keys that shade to nothing, and
+  on hardware it did not matter because the field behind them was white too.
+
+  BattlePics already put that paper back by flooding the background inward and
+  filling whatever it could not reach, and along the bottom of a figure it told
+  a narrow opening (a belly the drawing ran out of, sealed) from a wide one (a
+  stride, left open for the world to show through). Right for a mon standing
+  on the map -- but the pinned back pic is not on the map, it is on the text
+  box with its feet on row 96, and there is white box under its lowest row
+  rather than arena. Every one of those mons leaks out through an opening far
+  too wide to read as a drain, so the flood walked straight up inside them.
+
+  A pic on the box is now told so, and its bottom edge seals: nothing reaches
+  it from below at any width, and the rule stops being a heuristic -- paper is
+  whatever the background cannot walk to from the left, the right or the top.
+  Twelve of the game's 151 back pics turn on this; the other 139 come back
+  byte-identical, and no front pic is touched at all.
+
+  **And a hole is filled with the pic's own paper rather than with white.**
+  Shade 0 is only white while the pic is still grays, and pics arrive here
+  after the bake -- a species SGB colour, a BGP fade mid-animation, PAL_BLACK
+  across the whole screen while the blackout text is up. A hardcoded white
+  belly would have been the one lit thing on a blacked-out mon. The lightest
+  shade still standing in the pic is that colour, and every one of the game's
+  battler pics keeps at least one such pixel -- an eye, a highlight down a
+  cheek -- so what goes back is the baked shade itself.
+
 ### Known
 
 - Screen-space reflections can only reflect what is in the frame. A tree just

README.md

@@ -52,6 +52,7 @@ menu.
 | `8`, or the **3D-BTL** options row | ON / OFF — fight on the map instead of on a white field |
 | `9`, or the **WATER** options row | FULL / SKY / OFF — waves and reflections on water. **SKY** gives the surface its pixel-tall wave columns and puts the sky, the sun, the moon and the cast in them; **FULL** adds a screen-space ray march that also reflects the shoreline, the trees and the buildings standing behind it |
 | the **BACK SPRITES** options row | OFF / ON — keep your own Pokémon on the battle menu, seen from behind in its classic slot, instead of standing it on the map; the foe is still out there. Only on the menu while **3D-BTL** is on, because it decides nothing without it |
+| the **AA** options row | OFF / 2X / 4X — smooth the stair-stepped edges of the 3D world by rendering the diorama larger than the window and folding it back down. The ladder is samples per display pixel: 2X is a canvas root-two wider and taller, 4X one exactly twice the size. Every edge in the projected picture softens with the silhouettes — the tileset's own texels are quads in a perspective view and cross the pixel grid at the same arbitrary angles — so the diorama reads smoother rather than sharper. The most expensive row in the mod, so it is OFF by default and **FULL** leaves it alone |
 | the **DAYTIME** options row | SYNC / DAY / NIGHT / DUSK / DAWN / CYCLE — what time it is outdoors, on the diorama *and* on the flat 2D world; held at SYNC (and off the menu) while VOXEL is FULL |
 
 **3D-BTL** is on by default and is independent of **VOXEL**: battles draw

data/voxel_heights.lua

@@ -110,6 +110,9 @@ return {
     bed = 7,
     stool = 8,
     counter = 8,
+    -- the raised back band of low seating (the Center couch's back and
+    -- arm strip): half again the 8px seat it rises over
+    backrest = 12,
     table = 12,
     desk = 24,
     prop = 16,
@@ -579,6 +582,12 @@ return {
       -- auto-extracting into standing prisms, and the ball/Pokedex
       -- sprites ride the table's authored height.
       table = { 41, 42, 57, 59, 78, 79 },
+      -- These tables are drawn 6px tall (3px slab edge over 3px base --
+      -- see the lab_table entry under `buildings`), not the default
+      -- table's 12: the override keeps the volume-built north tables
+      -- and the band-built starter table one height, and stands the
+      -- ball/Pokedex sprites exactly on the top face of both.
+      heights = { table = 6 },
     },
 
     -- Red's room and the Copycat's room (one tileset).  The detector reads
@@ -699,14 +708,25 @@ return {
       -- one clean band, so the drawn front panel stands up and the
       -- counter top stays on top; at 12 they read as wall stubs
       counter = { 8, 10, 24, 25, 56, 90, 91,
-                  -- and the lounge couch with the man sitting on it.
-                  -- Same half-cell box: its bottom row (42/43, the front
-                  -- base) stands up as the couch's front, and the three
-                  -- rows above it -- cushion (38/39) and the man
-                  -- (36/37 head, 52/53 face) -- ride the top face in
+                  -- and the lounge couch's SEAT column with the man
+                  -- sitting on it.  Same half-cell box: its bottom row
+                  -- (43, the front base) stands up as the couch's
+                  -- front, and the rows above it -- cushion (39) and
+                  -- the man (37 head, 53 face) -- ride the top face in
                   -- drawn order, each exactly once.  See the note below
                   -- on why he cannot be stood upright.
-                  36, 37, 38, 39, 42, 43, 52, 53 },
+                  37, 39, 43, 53 },
+      -- The couch's WEST tile column: the drawing's left strip is the
+      -- couch's back and arm running north-south (the seat's cushions
+      -- and seams fill the east column), so it rises over the 8px seat
+      -- the way a couch back does instead of lying flush in the same
+      -- box.  Per-tile granularity puts the drawn ~6px strip plus a
+      -- 2px sliver of cushion on the raised band -- invisible at tile
+      -- scale, and the alternative is no backrest at all.  The figure
+      -- anchor scans for the tallest authored UPRIGHT under the man
+      -- (see Structures.buildFigure), so he keeps sitting at seat
+      -- height beside it.
+      backrest = { 36, 38, 42, 52 },
       -- standing per-pixel props, black-outline segmented: the healing
       -- machines' screen tops (58/59/74/75, drawn above the pinned
       -- bodies so they stand ON them) and the PC (66/70/82/86), which
@@ -3231,5 +3251,170 @@ return {
         slab = 4, frontEave = 4, ledge = nil,
       },
     },
+
+    DOJO = {
+      -- F01: the starter-ball table in Oak's lab (one placement in the
+      -- game: OAKS_LAB cell 6,3) -- the first FURNITURE through the
+      -- band pipeline, and the first drawing whose plot is smaller than
+      -- its grid. Its 24 rows read: 0-15 the tabletop seen from above
+      -- (black rim, white highlight course, grey field); 16-18 the top
+      -- slab's own front edge, black/#555/black -- which is exactly
+      -- what the rim treatment paints, so slab = 3 and those rows fold
+      -- into the roof band instead of extruding under it; 19-21 the
+      -- base band, corner feet and the inset dark panel between them.
+      --
+      -- The legs stand on open FLOOR: the measured ground line lands
+      -- two rows short of the grid (see Buildings measure), and `depth`
+      -- keeps the plot to the blocked cell row -- the grid's third row
+      -- is the walkable cell the player faces the table from, matched
+      -- so the flat leg art is claimed off the floor, not so the model
+      -- stands on it. 16 top rows onto a 16px plot map 1:1: roofBack
+      -- covers the whole depth, nothing cycles, and roofCycle is
+      -- unreachable behind it. The Poke Ball sprites ride the `table`
+      -- pin's height (VoxelScene.groundAt reads the collision tile, not
+      -- this model), so the tileset entry above overrides that height
+      -- to the 6px this drawing actually stands.
+      {
+        id = "lab_table",
+        tiles = {
+          { 41, 59, 59, 59, 59, 42 },
+          { 78, 57, 57, 57, 57, 79 },
+          { 88, 89, 89, 89, 89, 90 },
+        },
+        roofRows = 19, roofBack = 16, roofFront = 0, roofCycle = { 2, 13 },
+        slab = 3, frontEave = 0, ledge = nil, depth = 2,
+      },
+      -- F02: the computer desk on the lab's west side (OAKS_LAB cell
+      -- 0,1) -- the one DESK-SET template: the pipeline's region
+      -- classification at PART granularity (see Buildings
+      -- deskSetModel). The desk is the sibling lab table (fascia rows
+      -- 16-18, base 19-21); on it stand a monitor over its keyboard
+      -- (left), a computer tower over a keyboard and mouse (middle),
+      -- and a sheet of paper LYING FLAT (right). Upright parts anchor
+      -- their drawn bottom row to the desk's top plane and wear their
+      -- own drawn tops as lids; flat parts lie one voxel proud at
+      -- drawn row = depth row -- the same 1:1 the tabletop itself is
+      -- drawn with. The roof fields are inert (roofRows = 0 keeps the
+      -- recess scan over the whole drawing, which is what sinks the
+      -- monitor's screen and the tower's slots). Same drawing, same
+      -- grid, stands in the Hall of Fame on the GYM atlas --
+      -- registered there below.
+      {
+        id = "lab_computers",
+        tiles = {
+          { 91, 92, 93, 94 },
+          { 54, 55, 85, 95 },
+          { 88, 89, 89, 90 },
+        },
+        roofRows = 0, roofBack = 0, roofFront = 0, roofCycle = { 0, 0 },
+        slab = 0, frontEave = 0, ledge = nil, depth = 2,
+        desk = { fascia = { 16, 18 }, base = { 19, 21 } },
+        parts = {
+          { kind = "upright", x = { 2, 13 }, top = { 0, 2 },
+            facade = { 3, 10 }, depth = 4 },              -- the monitor
+          { kind = "flat", x = { 1, 13 }, rows = { 11, 14 } },  -- keyboard
+          { kind = "upright", x = { 14, 21 }, top = { 0, 3 },
+            facade = { 4, 10 }, depth = 6 },              -- the tower
+          { kind = "flat", x = { 14, 21 }, rows = { 11, 14 } }, -- keys+mouse
+          { kind = "flat", x = { 22, 30 }, rows = { 1, 14 } },  -- the paper
+        },
+      },
+      -- F03: the empty north table beside it (OAKS_LAB cell 2,1): the
+      -- starter table's band table verbatim on a grid two tiles
+      -- narrower.
+      {
+        id = "lab_table_small",
+        tiles = {
+          { 41, 59, 59, 42 },
+          { 78, 57, 57, 79 },
+          { 88, 89, 89, 90 },
+        },
+        roofRows = 19, roofBack = 16, roofFront = 0, roofCycle = { 2, 13 },
+        slab = 3, frontEave = 0, ledge = nil, depth = 2,
+      },
+    },
+
+    POKECENTER = {
+      -- F04: the PC in every Center's northeast corner (11
+      -- placements; the Indigo Plateau lobby's twin is registered
+      -- under MART below). The lab desk-set read again: a Mac-style
+      -- unit drawn face-on -- white top band (rows 0-3), bezel, screen
+      -- and drive slot (4-14) -- standing at the back of a low desk
+      -- whose front face is rows 20-23; the drawn top around the unit
+      -- is WHITE, which is what `lid` carries. The keyboard rows 17-19
+      -- are drawn below the desk's 16px top span, so the flat part's
+      -- `z` puts it at the desk's front edge. The old billboard pins
+      -- for these tiles (66/70/82/86, desk 9/88) stay as the
+      -- degradation path -- the claim neutralizes them wherever this
+      -- template stamps.
+      {
+        id = "center_pc",
+        tiles = {
+          { 66, 70 },
+          { 82, 86 },
+          {  9, 88 },
+        },
+        roofRows = 0, roofBack = 0, roofFront = 0, roofCycle = { 0, 0 },
+        slab = 0, frontEave = 0, ledge = nil, depth = 2,
+        desk = { fascia = { 20, 21 }, base = { 22, 23 }, lid = "white" },
+        parts = {
+          { kind = "upright", x = { 2, 13 }, top = { 0, 3 },
+            facade = { 4, 14 }, depth = 6 },                -- the unit
+          { kind = "flat", x = { 2, 13 }, rows = { 17, 19 },
+            z = 13 },                                       -- keyboard
+        },
+      },
+    },
+
+    MART = {
+      -- F04 again: the Indigo Plateau lobby's PC (cell 15,7) -- the
+      -- MART tileset shares the POKECENTER atlas, so this is the same
+      -- drawing tile for tile. Same part table as the POKECENTER entry
+      -- above.
+      {
+        id = "center_pc",
+        tiles = {
+          { 66, 70 },
+          { 82, 86 },
+          {  9, 88 },
+        },
+        roofRows = 0, roofBack = 0, roofFront = 0, roofCycle = { 0, 0 },
+        slab = 0, frontEave = 0, ledge = nil, depth = 2,
+        desk = { fascia = { 20, 21 }, base = { 22, 23 }, lid = "white" },
+        parts = {
+          { kind = "upright", x = { 2, 13 }, top = { 0, 3 },
+            facade = { 4, 14 }, depth = 6 },                -- the unit
+          { kind = "flat", x = { 2, 13 }, rows = { 17, 19 },
+            z = 13 },                                       -- keyboard
+        },
+      },
+    },
+
+    GYM = {
+      -- F02 again: the Hall of Fame's recording machine is the lab's
+      -- computer desk drawing, tile for tile, on the GYM atlas (one
+      -- placement: HALL_OF_FAME cell 4,1). Same part table as the DOJO
+      -- entry above.
+      {
+        id = "lab_computers",
+        tiles = {
+          { 91, 92, 93, 94 },
+          { 54, 55, 85, 95 },
+          { 88, 89, 89, 90 },
+        },
+        roofRows = 0, roofBack = 0, roofFront = 0, roofCycle = { 0, 0 },
+        slab = 0, frontEave = 0, ledge = nil, depth = 2,
+        desk = { fascia = { 16, 18 }, base = { 19, 21 } },
+        parts = {
+          { kind = "upright", x = { 2, 13 }, top = { 0, 2 },
+            facade = { 3, 10 }, depth = 4 },              -- the monitor
+          { kind = "flat", x = { 1, 13 }, rows = { 11, 14 } },  -- keyboard
+          { kind = "upright", x = { 14, 21 }, top = { 0, 3 },
+            facade = { 4, 10 }, depth = 6 },              -- the tower
+          { kind = "flat", x = { 14, 21 }, rows = { 11, 14 } }, -- keys+mouse
+          { kind = "flat", x = { 22, 30 }, rows = { 1, 14 } },  -- the paper
+        },
+      },
+    },
   },
 }

lib/AntiAlias.lua

@@ -0,0 +1,244 @@
+-- Voxel world mode: anti-aliasing, by supersampling.
+--
+-- Everything else in this mod is flat art blitted at whole pixels; this one
+-- pass is real geometry seen through a perspective camera, and a polygon
+-- edge that lands at an angle across the pixel grid is the one place in the
+-- game where a hard stair-step is not a stylistic choice. A roof ridge, a
+-- ledge lip, a tree's silhouette against the sky and the leaning card of a
+-- character are all cut by an edge that has no reason to line up with
+-- anything, and at the shallow rungs -- where the diorama reads most like a
+-- photograph of a model -- they crawl as the camera drifts.
+--
+-- SUPERSAMPLING, not MSAA and not a filter over the finished frame, for two
+-- reasons that both come out of what the pass already is:
+--
+--   MSAA would take the water with it. The reflections read the frame's own
+--   DEPTH buffer as a texture (Voxel3D.beginWater), and a multisampled depth
+--   attachment is not a thing a fragment shader in this dialect can sample.
+--   The row would have quietly switched the other row off.
+--
+--   An edge filter (FXAA and its relatives) works from the finished colour
+--   alone, and would be GUESSING where the edges are out of one sample per
+--   pixel -- inventing detail it never rendered, and unable to tell a
+--   geometry edge from the boundary between two texels of a tileset.
+--
+-- Rendering the pass larger and folding it back down has neither problem:
+-- the depth buffer stays an ordinary texture, every pass in the frame keeps
+-- working in the canvas it was handed, and the fold is an average of samples
+-- that were each rendered honestly. It antialiases everything at once --
+-- geometry, the alpha-cut outline of a sprite card, the wireframe, the
+-- water's ray march -- because none of them know it is happening.
+--
+-- Be clear about what "everything" means: the artwork softens too. A tileset
+-- texel out here is not a screen pixel, it is a quad in a perspective view,
+-- and its boundary crosses the pixel grid at the same arbitrary angle a roof
+-- ridge does -- so the fold averages across it exactly as it averages across
+-- the ridge. That is what an honest extra sample says about that pixel, and
+-- it is also the trade the row IS: the diorama comes out smoother, not
+-- sharper. Which is why this is a row and not something that is simply on.
+--
+-- What it costs is pixels, which is the whole of why this is a row and not
+-- something that is simply on: 2X is half again as many in each direction,
+-- 4X is twice, and the scene pass is the most expensive thing in the frame.
+
+-- the mod namespace (see main.lua): V.require loads a sibling module
+local V = ...
+
+local ModSetting = V.require("ModSetting")
+
+local AntiAlias = {}
+
+-- the key under options.modOptions.DRAMATIC_SHAPE, shared by the row in
+-- OPTIONS and the mod manager's own settings page for this mod
+AntiAlias.KEY = "aa"
+AntiAlias.LABEL = "AA"
+
+-- The ladder is SAMPLES PER DISPLAY PIXEL, which is how an AA setting reads
+-- everywhere else, and the canvas scale each rung costs is its square root:
+-- 2 samples is a canvas 1.41x wider and taller, 4 is one exactly twice the
+-- size. OFF is the default -- this is a cost knob, and a mod should not
+-- quietly spend four times the fill rate of the machine it lands on.
+AntiAlias.setting = ModSetting.new(AntiAlias.KEY, AntiAlias.LABEL,
+                                   { 0, 2, 4 }, { "OFF", "2X", "4X" })
+
+-- The scale the pass currently open was actually expanded by (see expand).
+-- 1 while there is no supersampling in force, which is also what every
+-- reader gets on a frame that never opened a pass at all.
+local live = 1
+
+function AntiAlias.samples()
+  return tonumber(AntiAlias.setting:get()) or 0
+end
+
+-- What the row ASKS for. The scale in force is `factor()`, which is this
+-- clamped to what the driver will actually allocate.
+local function wanted()
+  local n = AntiAlias.samples()
+  if n <= 1 then return 1 end
+  return math.sqrt(n)
+end
+
+-- The biggest canvas this driver admits to, or nil where it will not say.
+-- A 4K window at 4X asks for 7680 across, which is past the limit on plenty
+-- of hardware and every phone -- and a refused canvas is not a softer
+-- diorama, it is beginScene returning false and the whole mode falling back
+-- to the flat 2D path.
+local function textureLimit()
+  if not (love.graphics and love.graphics.getSystemLimits) then return nil end
+  local ok, limits = pcall(love.graphics.getSystemLimits)
+  return (ok and limits and limits.texturesize) or nil
+end
+
+-- The size to render `w` x `h` display pixels at, and the size everything
+-- inside the pass then measures itself in.
+--
+-- Also where `live` is set, which is why this must be called once per pass
+-- immediately before beginScene: the wireframe's line width and the FX
+-- overlay's sprite scale are both quoted in DISPLAY pixels and have to be
+-- multiplied up into canvas ones, and the honest multiplier is the one this
+-- returned rather than the one the row asked for.
+function AntiAlias.expand(w, h)
+  local s = wanted()
+  local max = textureLimit()
+  if max and max > 0 then
+    -- clamped rather than abandoned: a window too big for 4X can usually
+    -- still carry some of it, and half a rung of smoothing is worth more
+    -- than a row that silently does nothing at that size
+    s = math.min(s, max / math.max(1, w), max / math.max(1, h))
+  end
+  if not (s > 1.01) then
+    live = 1
+    return w, h
+  end
+  local ew, eh = math.floor(w * s + 0.5), math.floor(h * s + 0.5)
+  live = ew / math.max(1, w)
+  return ew, eh
+end
+
+-- The scale the open pass was expanded by; 1 when it was not.
+function AntiAlias.factor()
+  return live
+end
+
+-- ------- the fold
+--
+-- One target per pass (the free-roam world and the battle's arena are alive
+-- at different moments but reallocating on every battle entry and exit is
+-- what the scene canvas's own slots exist to avoid), reallocated only when
+-- that pass's DISPLAY size changes -- a window resize, or the row itself
+-- moving, which changes the source and not this.
+
+local targets = {}
+
+local function targetFor(slot, w, h)
+  local t = targets[slot]
+  if not (t and t.w == w and t.h == h) then
+    local ok, c = pcall(love.graphics.newCanvas, w, h)
+    if not (ok and c) then return nil end
+    -- nearest, like the canvas it stands in for: this one is composited a
+    -- canvas pixel to a display pixel, and the smoothing has already happened
+    pcall(c.setFilter, c, "nearest", "nearest")
+    if t and t.canvas and t.canvas.release then pcall(t.canvas.release, t.canvas) end
+    t = { canvas = c, w = w, h = h }
+    targets[slot] = t
+  end
+  return t.canvas
+end
+
+-- The box filter, and the whole of why it is a shader rather than a scaled
+-- draw with linear filtering on.
+--
+-- The void this pass renders into is cleared to a TRANSPARENT BLACK, and at
+-- the rungs below FULL a good deal of the frame is still that. Averaging a
+-- straight-alpha edge against it drags the result toward black as well as
+-- toward transparent, and then the engine's own composite multiplies by that
+-- alpha a second time -- so every silhouette against the void would come out
+-- ringed with a dark fringe, which is exactly the artefact the row is here to
+-- remove.
+--
+-- So the taps are premultiplied before they are averaged and divided back out
+-- after, which is the arithmetic that makes an edge pixel mean "half covered
+-- by this colour" instead of "covered by half of this colour".
+--
+-- Four taps, half a source texel from the destination centre. At 4X those
+-- land dead on the four texel centres the destination pixel covers, so it is
+-- an exact 2x2 box; at 2X the source grid does not divide, and the bilinear
+-- fetch under each tap widens the box a little rather than missing samples.
+local SHADER = [[
+  uniform vec2 tap;        // half a SOURCE texel, in uv
+  vec4 effect(vec4 color, Image tex, vec2 tc, vec2 sc) {
+    vec4 a = Texel(tex, tc + vec2(-tap.x, -tap.y));
+    vec4 b = Texel(tex, tc + vec2( tap.x, -tap.y));
+    vec4 c = Texel(tex, tc + vec2(-tap.x,  tap.y));
+    vec4 d = Texel(tex, tc + vec2( tap.x,  tap.y));
+    float al = (a.a + b.a + c.a + d.a) * 0.25;
+    if (al <= 0.0) return vec4(0.0);
+    vec3 sum = a.rgb * a.a + b.rgb * b.a + c.rgb * c.a + d.rgb * d.a;
+    return vec4(sum * 0.25 / al, al) * color;
+  }
+]]
+
+local shader = nil            -- nil = untried, false = unavailable
+
+local function getShader()
+  if shader == nil then
+    local ok, sh = pcall(love.graphics.newShader, SHADER)
+    shader = (ok and sh) or false
+  end
+  return shader or nil
+end
+
+-- Fold `canvas` down to `w` x `h` and hand back the result.
+--
+-- Returns the input untouched when there is nothing to fold -- the row is
+-- off, or the canvas already IS that size -- so a caller can run it
+-- unconditionally, and so can a headless test run. A target that would not
+-- allocate is the same answer: the pass is lost either way if this hands back
+-- something the wrong size, so it hands back the input and the frame draws at
+-- the size it was rendered.
+function AntiAlias.resolve(canvas, w, h, slot)
+  if not canvas then return canvas end
+  local ok, cw, ch = pcall(canvas.getDimensions, canvas)
+  if not ok or (cw == w and ch == h) then return canvas end
+  local target = targetFor(slot or "world", w, h)
+  if not target then return canvas end
+
+  local sh = getShader()
+  local prevBlend, prevAlpha = love.graphics.getBlendMode()
+  -- the scene canvas filters nearest for its usual 1:1 blit; the taps want
+  -- linear, put back below so every other pass finds what it expects
+  pcall(canvas.setFilter, canvas, "linear", "linear")
+  love.graphics.setColor(1, 1, 1, 1)
+  -- replace, not alpha-blend: this is an image-processing copy, and the alpha
+  -- the shader worked out has to land as itself rather than be composited
+  -- against whatever the target held
+  love.graphics.setBlendMode("replace", "premultiplied")
+  if sh then
+    love.graphics.setShader(sh)
+    pcall(sh.send, sh, "tap", { 0.5 / cw, 0.5 / ch })
+  end
+  local drew = pcall(function()
+    love.graphics.setCanvas(target)
+    love.graphics.clear(0, 0, 0, 0)
+    love.graphics.draw(canvas, 0, 0, 0, w / cw, h / ch)
+  end)
+  love.graphics.setCanvas()
+  love.graphics.setShader()
+  love.graphics.setBlendMode(prevBlend or "alpha", prevAlpha)
+  pcall(canvas.setFilter, canvas, "nearest", "nearest")
+  return drew and target or canvas
+end
+
+-- Drop the GPU objects (window resize, hot reload).
+function AntiAlias.invalidate()
+  for slot, t in pairs(targets) do
+    if t.canvas and t.canvas.release then pcall(t.canvas.release, t.canvas) end
+    targets[slot] = nil
+  end
+end
+
+function AntiAlias.row()
+  return AntiAlias.setting:row()
+end
+
+return AntiAlias

lib/BattlePics.lua

@@ -57,6 +57,26 @@
 -- and they come back untouched because that is what their own shape says, not
 -- because they were special-cased.
 --
+-- The drain/mouth cut is for a pic STANDING ON THE MAP, where a mouth is a
+-- real hole with real ground behind it. A pic PINNED TO THE MENU has no such
+-- hole to be: under BACK SPRITES the player's mon is drawn in the GB's own
+-- slot with its feet flush on the text box (BattleState.backPlacement pins
+-- row 96), so the only thing under its lowest row is white box. Nothing can
+-- reach it from below, whatever the opening's width, and the caller says so
+-- by asking for a SEALED BOTTOM -- for which the rule stops being a heuristic
+-- and becomes exact: paper is whatever the background cannot walk to from the
+-- left, the right or the top.
+--
+-- That is the difference between a Pikachu that reads as a mon and one that
+-- reads as wireframe. The pale-bodied back pics -- Pikachu, Seel, Dewgong,
+-- Chansey, Jigglypuff -- are drawn as OUTLINES: everything inside the ink is
+-- shade 0 and every one of them is keyed away, so the figure is a rim with the
+-- arena showing through it. Each one also has a wide opening along its bottom,
+-- which the drain cut correctly reads as a mouth and the sealed bottom
+-- correctly does not. Twelve of this game's 151 back pics turn on it; the
+-- other 139 come back byte-identical either way, because they had nothing
+-- under them the flood was getting in through.
+--
 -- The silhouette is untouched, so the mon still cuts cleanly against the
 -- world; only its insides stop being see-through.
 --
@@ -71,14 +91,23 @@ local V = ...
 
 local BattlePics = {}
 
--- Cached by the image the engine handed over. Weak keys, so a pic that goes
--- out of scope takes its filled twin with it rather than pinning a texture
--- for the session.
-local cache = setmetatable({}, { __mode = "k" })
+-- Cached by the image the engine handed over, one table per bottom rule --
+-- the same pic answers differently sealed and unsealed, and a single table
+-- would hand the wrong twin back to whichever caller asked second. Weak keys,
+-- so a pic that goes out of scope takes its filled twin with it rather than
+-- pinning a texture for the session.
+local function newCache()
+  return {
+    [false] = setmetatable({}, { __mode = "k" }),
+    [true]  = setmetatable({}, { __mode = "k" }),
+  }
+end
+local cache = newCache()
 
--- What an enclosed hole is filled with. White, because white is what the
--- battle field was: this restores the pixel the artist drew and the engine
--- then keyed away, it does not invent a new one.
+-- What an enclosed hole is filled with when the pic itself offers nothing
+-- better. White, because white is what the battle field was: this restores the
+-- pixel the artist drew and the engine then keyed away, it does not invent a
+-- new one.
 BattlePics.FILL = { 1, 1, 1, 1 }
 
 -- Anything at or under this alpha counts as keyed-out rather than drawn.
@@ -154,6 +183,42 @@ local function inkBounds(data, w, h)
   return x0, y0, x1, y1
 end
 
+-- The colour the keyed-away shade would have had: the LIGHTEST colour still
+-- standing in the pic.
+--
+-- Pure white is only the right answer while the pic is still grays, and by the
+-- time it reaches here it usually is not. picImage hands a pic over AFTER the
+-- bake -- a species SGB colour, a BGP fade mid-animation, PAL_BLACK for the
+-- whole screen while the blackout text is up -- and shade 0 travels with the
+-- rest. A white belly inside a blacked-out mon would be the one lit thing on a
+-- dark screen; inside a warm-palette mon it would be a cold patch the artist
+-- never drew.
+--
+-- So the paper is read off the pic rather than assumed, which needs shade 0 to
+-- have survived somewhere in it. It always has: every one of this game's 151
+-- back pics keeps at least one opaque shade-0 pixel -- a highlight down a
+-- cheek, the white of an eye -- because only the shade-0 pixels the decoder
+-- could reach were keyed. So what comes back is the baked shade 0 itself, not
+-- an approximation of it, and it tracks every palette the engine picks without
+-- being told which one that was.
+--
+-- Ranked by channel sum, which orders four DMG shades exactly: a palette maps
+-- all three channels monotonically, so lightest by sum is lightest full stop.
+local function paperColor(data, x0, y0, x1, y1)
+  local best, pr, pg, pb = -1, nil, nil, nil
+  for y = y0, y1 do
+    for x = x0, x1 do
+      local r, g, b, a = data:getPixel(x, y)
+      if a > CUT then
+        local lum = r + g + b
+        if lum > best then best, pr, pg, pb = lum, r, g, b end
+      end
+    end
+  end
+  if best < 0 then return nil end
+  return pr, pg, pb
+end
+
 -- The widest opening along the bottom of a figure that still counts as a drain
 -- rather than a mouth. See the header for the measurements either side of it.
 BattlePics.DRAIN = 6
@@ -161,7 +226,9 @@ BattlePics.DRAIN = 6
 -- Mark every transparent pixel the BACKGROUND can reach, flooding inward from
 -- the edges of the artwork's box: the left, the right and the top whole, and
 -- along the bottom only those openings wide enough to be background rather
--- than the underside of a figure the drawing ran out of.
+-- than the underside of a figure the drawing ran out of -- or none of them at
+-- all, for a pic whose feet are on the text box and which therefore has
+-- nothing behind its lowest row to let in.
 --
 -- Confined to the box as well as seeded from it, so the empty frame under a
 -- short pic cannot walk around a sealed drain and come back up through it.
@@ -169,7 +236,7 @@ BattlePics.DRAIN = 6
 -- An explicit stack rather than recursion: a 56x56 pic is three thousand
 -- pixels and a keyed-out background is most of them, which is a deeper call
 -- chain than is worth risking for no gain.
-local function markOutside(data, w, h, x0, y0, x1, y1)
+local function markOutside(data, w, h, x0, y0, x1, y1, sealBottom)
   local outside = {}
   local stack, top = {}, 0
   local function clear(x, y)
@@ -191,17 +258,21 @@ local function markOutside(data, w, h, x0, y0, x1, y1)
     push(x1, y)
   end
   -- the bottom, run by run: a wide one is the gap between two legs and lets
-  -- the world through, a narrow one is where a belly ran out and is sealed
-  local x = x0
-  while x <= x1 do
-    if clear(x, y1) then
-      local from = x
-      while x <= x1 and clear(x, y1) do x = x + 1 end
-      if (x - from) > BattlePics.DRAIN then
-        for k = from, x - 1 do push(k, y1) end
+  -- the world through, a narrow one is where a belly ran out and is sealed.
+  -- Skipped whole for a pic on the box, where even the widest of them has
+  -- white paper behind it rather than arena.
+  if not sealBottom then
+    local x = x0
+    while x <= x1 do
+      if clear(x, y1) then
+        local from = x
+        while x <= x1 and clear(x, y1) do x = x + 1 end
+        if (x - from) > BattlePics.DRAIN then
+          for k = from, x - 1 do push(k, y1) end
+        end
+      else
+        x = x + 1
       end
-    else
-      x = x + 1
     end
   end
   while top > 0 do
@@ -219,9 +290,15 @@ end
 -- The pic with its enclosed holes filled, or the pic itself when that could
 -- not be done (no pixel access, a driver that refused the readback). Never
 -- nil for a non-nil argument: a caller must always have something to draw.
-function BattlePics.filled(img)
+--
+-- sealBottom for a pic pinned to the text box rather than standing on the map:
+-- see the header. A caller that does not say defaults to the map, which is
+-- where all but one of this mod's pics are.
+function BattlePics.filled(img, sealBottom)
   if not img then return img end
-  local hit = cache[img]
+  sealBottom = sealBottom and true or false
+  local slot = cache[sealBottom]
+  local hit = slot[img]
   if hit ~= nil then return hit or img end
 
   local made = nil
@@ -231,8 +308,12 @@ function BattlePics.filled(img)
     local w, h = data:getDimensions()
     local x0, y0, x1, y1 = inkBounds(data, w, h)
     if not x0 then return end          -- a pic with nothing drawn in it
-    local outside = markOutside(data, w, h, x0, y0, x1, y1)
+    local outside = markOutside(data, w, h, x0, y0, x1, y1, sealBottom)
     local fill = BattlePics.FILL
+    local pr, pg, pb = paperColor(data, x0, y0, x1, y1)
+    local fr = pr or fill[1]
+    local fg = pg or fill[2]
+    local fb = pb or fill[3]
     local changed = false
     -- only inside the box: everything beyond it is frame the artist never
     -- reached, and filling that would put the mon in a white rectangle
@@ -242,7 +323,7 @@ function BattlePics.filled(img)
         if not outside[row + x] then
           local _, _, _, a = data:getPixel(x, y)
           if a <= CUT then
-            data:setPixel(x, y, fill[1], fill[2], fill[3], fill[4])
+            data:setPixel(x, y, fr, fg, fb, fill[4])
             changed = true
           end
         end
@@ -255,12 +336,12 @@ function BattlePics.filled(img)
     made = out
   end)
 
-  cache[img] = (ok and made) or false
+  slot[img] = (ok and made) or false
   return made or img
 end
 
 function BattlePics.invalidate()
-  cache = setmetatable({}, { __mode = "k" })
+  cache = newCache()
 end
 
 return BattlePics

lib/BattleScene.lua

@@ -42,6 +42,7 @@ local BattleCam = V.require("BattleCam")
 local BattleBillboard = V.require("BattleBillboard")
 local VoxelGrid = V.require("VoxelGrid")
 local DayNight = V.require("DayNight")
+local AntiAlias = V.require("AntiAlias")
 local PaletteFX = require("src.render.PaletteFX")
 local Map = require("src.world.Map")
 
@@ -427,7 +428,16 @@ function BattleScene.render(state, arena, textures, token)
     -- its own canvas slot: this renders at the window's pixel size and the
     -- free-roam pass does too, but the two are alive at different moments
     -- and a shared slot would reallocate on every battle entry and exit
-    if not Voxel3D.beginScene(pw, ph, cx, cy, vw, vh, sky, "battle") then
+    --
+    -- AA, if the row asks for it, renders it larger still and folds it back
+    -- to pw x ph below (see AntiAlias). The framing is untouched by that:
+    -- the lens was widened by the window's RATIO to the letterbox and the
+    -- rig solved in the GB's own frame, so a bigger canvas is more samples
+    -- of the identical shot -- which is why the pins below still measure in
+    -- pw and ph, and why the HUDs and the depth of field, drawn onto the
+    -- folded canvas afterwards, stay the chunky GB art they are.
+    local rw, rh = AntiAlias.expand(pw, ph)
+    if not Voxel3D.beginScene(rw, rh, cx, cy, vw, vh, sky, "battle") then
       return
     end
     Voxel3D.draw(terrain, atlasFor(host), nil)
@@ -500,7 +510,7 @@ function BattleScene.render(state, arena, textures, token)
                    Mat4.translate(nb.ox, 0, nb.oy), fpull,
                    ShadowMap.snug(Mat4.translate(nb.ox, 0, nb.oy)))
     end
-    local canvas = Voxel3D.endScene()
+    local canvas = AntiAlias.resolve(Voxel3D.endScene(), pw, ph, "battle")
     if not canvas then return end
 
     local vp = Voxel3D.vp

lib/Buildings.lua

@@ -190,7 +190,24 @@ local function measure(sp, t)
     top[x] = r
   end
 
-  local wallH = H - roofRows
+  -- The drawing's own ground line: the row after the last drawn one. A
+  -- building ends on the black threshold row it stands on (ground == H),
+  -- but furniture is drawn standing on open floor -- the lab table's
+  -- legs stop two rows short of its grid -- and extruding against H
+  -- would float it that far above its own plot.
+  local ground = roofRows
+  for sy = H - 1, roofRows, -1 do
+    local drawn = false
+    for sx = 0, W - 1 do
+      if sp.inside[sy * W + sx] then drawn = true break end
+    end
+    if drawn then
+      ground = sy + 1
+      break
+    end
+  end
+
+  local wallH = ground - roofRows
   local ytop = wallH - 1 + t.slab
 
   -- Side faces must not come out as slabs of outline black: where the
@@ -279,20 +296,175 @@ local function measure(sp, t)
   -- sprite taller than its footprint -- the tower's 16-row drawing
   -- stands on the 8 rows of it that are actually on the map, and D = H
   -- would have pushed its body 64px south into the town plaza.
-  return { top = top, ytop = ytop, D = #t.tiles * 8,
+  -- `depth` (in tile rows) names the plot when the grid runs PAST it
+  -- onto ground the drawing merely stands its legs on: the lab table's
+  -- third row is the walkable cell the player faces it from, and the
+  -- full-grid depth would stand the model in their path.
+  return { top = top, ytop = ytop, D = (t.depth or #t.tiles) * 8,
+           ground = ground,
            recess = recess, interior = interior, shadeTexel = shadeTexel }
 end
 
 -- ----------------------------------------------------------------- build --
 
+-- A desk with separately-classified objects on it (a template's `parts`
+-- list): the methodology's region classification at part granularity.
+-- Upright parts anchor their drawn bottom row to the desk's top plane
+-- and wear their own drawn tops as lids; flat parts (a keyboard, a
+-- sheet of paper) lie one voxel proud at drawn row = depth row -- the
+-- same 1:1 the tabletop itself is drawn with, so an object's height ON
+-- the drawing is its position ON the desk. The desk is the lab-table
+-- slab + base; its lid is the one synthesized surface in the model
+-- (the objects cover every drawn pixel of the tabletop), continued
+-- from the sibling tables' pattern in the drawing's own shades.
+-- tools/building_voxels.py `build_desk_set` is the reference twin.
+local function deskSetModel(sp, pr, t)
+  local W, H, D = sp.W, sp.H, pr.D
+  local ground = pr.ground
+  local col, inside = sp.col, sp.inside
+  local vox = {}
+  local function key(x, y, z) return (y * D + z) * W + x end
+  local function put(x, y, z, i) vox[key(x, y, z)] = i end
+
+  -- de-outline walk bounded to the part, so a part's side faces show
+  -- its own material and never the neighbour's (the sprite-wide walk
+  -- the facade path uses would cross the black seam between units)
+  local function interiorAt(sx, sy, lo, hi)
+    local i = sy * W + sx
+    if col[i] ~= BLACK then return sx end
+    local step = sx < math.floor((lo + hi) / 2) and 1 or -1
+    for d = 1, 3 do
+      local nx = sx + step * d
+      if nx >= lo and nx <= hi then
+        local ni = sy * W + nx
+        if inside[ni] and col[ni] ~= BLACK then return nx end
+      end
+    end
+    return sx
+  end
+
+  local f0, f1 = t.desk.fascia[1], t.desk.fascia[2]
+  local b0, b1 = t.desk.base[1], t.desk.base[2]
+  local plane = (b1 - b0 + 1) + (f1 - f0 + 1)
+
+  -- the base band, extruded exactly like every lab table's
+  for sy = b0, b1 do
+    Budget.tick()
+    local y = ground - 1 - sy
+    for sx = 0, W - 1 do
+      if inside[sy * W + sx] then
+        local ix = interiorAt(sx, sy, 0, W - 1)
+        for z = 0, D - 1 do
+          local px = (z == 0 or z == D - 1) and sx or ix
+          put(sx, y, z, sy * W + px)
+        end
+      end
+    end
+  end
+  for i in pairs(pr.recess) do
+    local sy = math.floor(i / W)
+    if sy >= b0 and sy <= b1 then
+      vox[key(i % W, ground - 1 - sy, D - 1)] = nil
+    end
+  end
+
+  -- the slab: fascia rows wrap every side; the lid continues the
+  -- sibling tables' top -- black rim, white highlight courses along
+  -- the north and west, grey field
+  for sy = f0, f1 do
+    Budget.tick()
+    local y = plane - 1 - (sy - f0)
+    for sx = 0, W - 1 do
+      for z = 0, D - 1 do put(sx, y, z, sy * W + sx) end
+    end
+  end
+  local field = t.desk.lid == "white" and WHITE or GREY
+  for sx = 0, W - 1 do
+    for z = 0, D - 1 do
+      local shade = field
+      if sx == 0 or sx == W - 1 or z == 0 or z == D - 1 then
+        shade = BLACK
+      elseif sx == 1 or z == 1 then
+        shade = WHITE
+      end
+      put(sx, plane - 1, z, pr.shadeTexel[shade])
+    end
+  end
+
+  local ytop = plane
+  for _, p in ipairs(t.parts) do
+    Budget.tick()
+    local x0, x1 = p.x[1], p.x[2]
+    if p.kind == "flat" then
+      -- drawn row = depth row by default; `z` renames the origin when
+      -- the flat sits below the desk's own drawn top span (the Center
+      -- PC's keyboard)
+      local r0 = p.rows[1]
+      local z0 = p.z or r0
+      for sy = r0, p.rows[2] do
+        local z = z0 + (sy - r0)
+        if z >= 0 and z < D then
+          for sx = x0, x1 do
+            if inside[sy * W + sx] then put(sx, plane, z, sy * W + sx) end
+          end
+        end
+      end
+    else
+      local tr0, tr1 = p.top[1], p.top[2]
+      local fr0, fr1 = p.facade[1], p.facade[2]
+      local pd = p.depth
+      local ytp = plane + (fr1 - fr0)
+      if ytp > ytop then ytop = ytp end
+      for sx = x0, x1 do
+        -- the lid: the part's drawn top laid across its depth from the
+        -- back, last row continuing forward; the front lid row is the
+        -- facade's own top row -- the drawn front-top edge
+        for z = 0, pd - 1 do
+          local front = z == pd - 1
+          local sy = front and fr0 or math.min(tr0 + z, tr1)
+          while sy <= tr1 and not inside[sy * W + sx] do sy = sy + 1 end
+          local ok = sy <= tr1 or (front and inside[fr0 * W + sx])
+          if ok then
+            put(sx, ytp, z, (front and fr0 or sy) * W + sx)
+          end
+        end
+        -- the body: facade rows anchored to the desk's top plane
+        for sy = fr0 + 1, fr1 do
+          local y = plane + (fr1 - sy)
+          local i = sy * W + sx
+          if inside[i] then
+            local ix = interiorAt(sx, sy, x0, x1)
+            for z = 0, pd - 1 do
+              if z == pd - 1 then
+                if not pr.recess[i] then put(sx, y, z, i) end
+              elseif z == 0 then
+                put(sx, y, z, i)
+              else
+                put(sx, y, z, sy * W + ix)
+              end
+            end
+          end
+        end
+      end
+    end
+  end
+
+  return { at = function(x, y, z)
+             if x < 0 or x >= W or y < 0 or z < 0 or z >= D then return nil end
+             return vox[key(x, y, z)]
+           end,
+           W = W, ytop = ytop, zmin = 0, zmax = D - 1 }
+end
+
 -- The voxel model as a lookup: `at(x, y, z)` is the index of the sprite
 -- pixel that voxel wears, or nil. Build ORDER is expressed as lookup
 -- order -- roof first, so it overwrites the walls it intersects, and walls
 -- are trimmed to its underside so nothing pokes through the surface.
 local function model(sp, pr, t)
+  if t.parts then return deskSetModel(sp, pr, t) end
   local W, H, D = sp.W, sp.H, pr.D
   local slab, roofRows = t.slab, t.roofRows
-  local top, ytop = pr.top, pr.ytop
+  local top, ytop, ground = pr.top, pr.ytop, pr.ground
 
   -- The roof's drawn span. A sprite inset from its box (B03) leaves outer
   -- columns undrawn in the roof band; they carry no roof at all, and the
@@ -367,16 +539,18 @@ local function model(sp, pr, t)
 
     -- the awning: the band juts two voxels past the walls, front and back
     if ledge0 and (z == -2 or z == -1 or z == D or z == D + 1) then
-      local sy = H - 1 - y
+      local sy = ground - 1 - y
       if sy >= ledge0 and sy <= ledge1 and sp.inside[sy * W + x] then
         return sy * W + x
       end
       return nil
     end
 
-    -- the facade, extruded straight back over the footprint
+    -- the facade, extruded straight back over the footprint. Rows map
+    -- against the measured ground line, not the grid's last row: the two
+    -- differ only for furniture standing on open floor (see measure).
     if z < 0 or z >= D then return nil end
-    local sy = H - 1 - y
+    local sy = ground - 1 - y
     local i = sy * W + x
     if y == 0 and not sp.inside[i] and sy > 0 and sp.inside[i - W] then
       -- the drawing's last row is the ground the building stands on, so

lib/OverworldBattle.lua

@@ -104,6 +104,31 @@ function OverworldBattle.backPinned()
   return OverworldBattle.backSetting:get() and true or false
 end
 
+-- Whether a pic is the one drawn in the GB's own slot with its feet on the
+-- text box, rather than geometry standing out on the map.
+--
+-- Exactly the player's side under BACK SPRITES -- its mon, or the trainer back
+-- that holds the slot until "Go!" -- because that is the only pic this mod
+-- ever leaves flat (see drawPicsLayer below). The foe is a billboard on its
+-- tile whichever mode is on, and with the mode off the player's side is one
+-- too, so both of those keep the open bottom that lets the arena through a
+-- stride. What the answer buys is in BattlePics: a pic on the box has nothing
+-- behind its lowest row, so its bottom edge seals.
+-- Read by TRUTHINESS rather than against nil, because sideTexture blanks the
+-- side it is not rendering by setting the field to FALSE (see OFF) and holds
+-- it that way for the whole render -- during which the pic layer runs, and
+-- picImage asks this. A nil test passes a `false` straight through to the
+-- index below, and the error comes out of sideTexture into the pcall that
+-- calls it: the foe's billboard is dropped for the frame and the Pokemon
+-- simply is not there.
+function OverworldBattle.pinnedPic(battle, img)
+  if not (battle and img) then return false end
+  if not OverworldBattle.backPinned() then return false end
+  if img == battle.playerBackPic then return true end
+  local player = battle.player
+  return (player and img == player.sprite) and true or false
+end
+
 -- ------- both mons face you
 --
 -- Standing on a map, seen from in front, a Pokemon showing you its BACK is
@@ -831,11 +856,17 @@ function OverworldBattle.install()
   -- behind it. There is a world back there now, so they are filled here
   -- instead -- see BattlePics, which puts the paper back without touching
   -- the silhouette.
+  --
+  -- The pinned pic is told that its feet are on the box, which is what lets
+  -- the pale-bodied back sprites be filled at all: their bellies leak out
+  -- through an opening too wide to read as a drain, and only the box under
+  -- them settles that it is not a hole. Passed the pre-bake image, because
+  -- that is the one the battle holds a reference to.
   local innerPic = BattleState.picImage
   function BattleState:picImage(img)
     local out = innerPic(self, img)
     if not OverworldBattle.shot() then return out end
-    return BattlePics.filled(out)
+    return BattlePics.filled(out, OverworldBattle.pinnedPic(self, img))
   end
 
   -- While a billboard texture is being rendered both pics are put in the same

lib/Structures.lua

@@ -2253,14 +2253,22 @@ local function buildFigure(S, map, fig, tx, ty, perRow)
   -- He stands ON the furniture he was drawn into -- the same lift a pinned
   -- prop above a pinned box takes (see buildObject), and gated the same
   -- way: a thing set down on furniture occupies a BLOCKED cell, while a
-  -- seat you merely walk up to is in a walkable one.
+  -- seat you merely walk up to is in a walkable one.  The row under his
+  -- card is SCANNED for the tallest authored upright rather than read at
+  -- its west corner: the corner tile can be furniture that is not his
+  -- seat (the couch's raised backrest column stands there, `top` art and
+  -- taller than the cushion he actually sits on).
   local baseY = 0
-  local bs = S.shapeAt[keyOf(tx, ty + fig.h)]
   local blocked = not map:isWalkableCell(math.floor(tx / 2),
                                          math.floor((ty + fig.h - 1) / 2))
-  if blocked and bs and bs.authored and bs.art == "upright"
-     and (bs.h or 0) > 0 then
-    baseY = bs.h
+  if blocked then
+    for dx = 0, fig.w - 1 do
+      local bs = S.shapeAt[keyOf(tx + dx, ty + fig.h)]
+      if bs and bs.authored and bs.art == "upright"
+         and (bs.h or 0) > baseY then
+        baseY = bs.h
+      end
+    end
   end
 
   local atlasW = map.tileset.imageWidth or 128

lib/TileShape.lua

@@ -83,6 +83,10 @@ local FALLBACK_HEIGHTS = {
   bed = 7,
   stool = 8,
   counter = 8,
+  -- the raised back band of low seating: the Center couch's west strip
+  -- is drawn from above like the rest of the couch, but depicts the
+  -- back and arm rising over the 8px seat
+  backrest = 12,
   table = 12,
   desk = 24,
   prop = 16,
@@ -145,6 +149,9 @@ local ART = {
   -- profile archetype Structures builds real steps for -- rising flights
   -- for stairs leading up, sunken stairwells for stairs leading down
   bed = "top",
+  -- a backrest's art is the couch seen from above, so like the bed it
+  -- rides the top face of its taller box
+  backrest = "top",
   stool = "billboard",
   -- half-cell furniture: a service counter, a low couch.  One 8px band,
   -- so exactly the drawing's bottom row stands up as the front and
@@ -295,6 +302,24 @@ function TileShape.forMap(map)
   if cache[id] then return cache[id] end
 
   local heights = TileShape.heights()
+  -- Per-tileset height overrides (a tileset entry's `heights`): the class
+  -- vocabulary is global but the drawings are not -- the DOJO lab tables
+  -- are drawn 6px tall where the default `table` is 12 -- and the height
+  -- a sprite RIDES at (VoxelScene.groundAt) must be the height the art
+  -- actually stands, or the starter balls float over their own table.
+  -- Same gate as the global list: known classes, numbers only.
+  do
+    local s = load()
+    local entry = s and s.tilesets and s.tilesets[id]
+    local over = entry and entry.heights
+    if type(over) == "table" then
+      for class, h in pairs(over) do
+        if type(h) == "number" and FALLBACK_HEIGHTS[class] then
+          heights[class] = h
+        end
+      end
+    end
+  end
   local authored = authoredGroups(id, heights)
   local count = math.floor((tileset.imageWidth or 128) / 8)
                 * math.floor((tileset.imageHeight or 48) / 8)

lib/Voxel3D.lua

@@ -715,7 +715,7 @@ function Voxel3D.beginScene(w, h, cx, cy, vw, vh, sky, slot)
   pcall(sh.send, sh, "sunTexel", { texel, texel })
   if grid then
     pcall(sh.send, sh, "gridDark", VoxelGrid.DARK)
-    pcall(sh.send, sh, "gridWidth", VoxelGrid.WIDTH)
+    pcall(sh.send, sh, "gridWidth", VoxelGrid.width())
   end
   -- ordinary shading until the silhouette pass asks for otherwise. Sent
   -- every frame rather than once, because a scene that opened mid-ghost --

lib/VoxelGrid.lua

@@ -44,6 +44,19 @@ VoxelGrid.DARK = 0.45
 -- 1.0 here is the one-pixel wireframe.
 VoxelGrid.WIDTH = 1.0
 
+-- The same width in the CANVAS pixels the shader measures in, which is what
+-- every sender of it actually wants.
+--
+-- The two are the same number until AA renders the pass larger than the
+-- window (see AntiAlias): there a canvas pixel is a fraction of a display
+-- one, and a width left at 1.0 would come out a half or a quarter of a line
+-- after the fold -- the wireframe fading as the smoothing goes up, which
+-- reads as one row breaking the other. Scaled, it stays a one-pixel seam and
+-- simply gains the antialiasing everything else in the frame just gained.
+function VoxelGrid.width()
+  return VoxelGrid.WIDTH * V.require("AntiAlias").factor()
+end
+
 -- where it persists and the rows that cycle it (see ModSetting)
 VoxelGrid.setting = ModSetting.new(VoxelGrid.KEY, VoxelGrid.LABEL,
                                    { false, true }, { "OFF", "ON" })

lib/Water.lua

@@ -1192,7 +1192,7 @@ function Water.begin(ctx)
   if ctx.grid then
     local VoxelGrid = V.require("VoxelGrid")
     send("gridDark", VoxelGrid.DARK)
-    send("gridWidth", VoxelGrid.WIDTH)
+    send("gridWidth", VoxelGrid.width())
   end
 
   Water.sendSky(sh, ctx)

main.lua

@@ -82,6 +82,7 @@ local BattleExit = V.require("BattleExit")
 local DayNight = V.require("DayNight")
 local DayTint = V.require("DayTint")
 local Water = V.require("Water")
+local AntiAlias = V.require("AntiAlias")
 
 -- Forward declaration: the voxel pipeline's update hook (registered below)
 -- calls this, and it is defined further down with the settings it drives.
@@ -203,20 +204,34 @@ mod.content.render_pipelines:register("voxel", {
     -- a magnified low-res image, while the FX closures keep drawing in
     -- world-pixel units.
     local sw, sh = sceneSize(ctx)
-    local canvas = VoxelScene.render(ctx.state, sw, sh,
+    -- With AA on, the whole pass runs into a canvas BIGGER than the window
+    -- and is folded back down at the end (see AntiAlias).  Nothing between
+    -- these two lines knows: every pass in the frame measures itself in the
+    -- canvas it was handed, so the sky's dither, the water's march and the
+    -- camera itself all come out the same picture at a higher sample rate.
+    local rw, rh = AntiAlias.expand(sw, sh)
+    local canvas = VoxelScene.render(ctx.state, rw, rh,
                                      ctx.vw, ctx.vh, ctx.paletteFor)
     if not canvas then return nil end   -- fall back to the 2D path
     if Voxel3D.beginOverlay() then
+      -- the FX closures are ordinary 2D draws sized in DISPLAY pixels, and
+      -- they are drawing into the supersampled canvas alongside everything
+      -- else -- so the scale goes up with it, or the "!" bubble lands the
+      -- right place at half the size.  project() already answers in canvas
+      -- pixels, so only the scale needs saying.
       ctx.drawFx(function(wx, wy) return Voxel3D.project(wx, 0, wy) end,
-                 ctx.scale)
+                 ctx.scale * AntiAlias.factor())
       Voxel3D.endOverlay()
     end
-    return canvas
+    -- and back to the window's own size, which is what the engine composites
+    -- one canvas pixel to one display pixel.  A pass-through when AA is off.
+    return AntiAlias.resolve(canvas, sw, sh, "world")
   end,
 
   invalidate = function()
     Voxel3D.invalidate()
     OverworldBattle.invalidate()
+    AntiAlias.invalidate()
     ChunkMesher.invalidate()   -- no map id = every cached mesh
   end,
 })
@@ -361,6 +376,21 @@ local SETTINGS = {
     .. "let CYCLE run it -- ten minutes of sun, ten of moon, with the "
     .. "shadows, the sky and the light following -- or SYNC it to the "
     .. "clock on the wall, so Kanto's evening falls when yours does." },
+  -- Marked `full` for the opposite reason the battle rows are: this is not a
+  -- knob on the look at all, it is what the look COSTS. FULL is a preset for
+  -- the diorama, not a licence to spend four times the fill rate on the
+  -- machine it happens to be running on, so it neither sets this nor takes
+  -- the row away -- the player decides what their hardware can carry, from
+  -- inside FULL like anywhere else.
+  { AntiAlias.setting,
+    "Smooth the stair-stepped edges of the 3D world -- roof ridges, ledge "
+    .. "lips, a tree against the sky -- by rendering the diorama larger than "
+    .. "the window and folding it back down. Every edge in the picture "
+    .. "softens with them, the tileset's own texels included, so the diorama "
+    .. "reads smoother rather than sharper. 2X costs half again as many "
+    .. "pixels in each direction and 4X twice, which makes this the most "
+    .. "expensive row in the mod.",
+    full = true },
 }
 
 local schema = {}
@@ -860,7 +890,7 @@ mod.hooks:wrap("world.tod", function(next, tod, ctx)
   return DayNight.tod()
 end)
 
-mod.exports.version = "1.4.0"
+mod.exports.version = "1.4.1"
 -- exposed so a companion mod can pin its own tiles' shapes or read the
 -- camera without reaching into this mod's file layout
 mod.exports.lib = V

manifest.json

@@ -1,7 +1,7 @@
 {
   "id": "DRAMATIC_SHAPE",
   "name": "Dramatic Shape Voxel Mod",
-  "version": "1.4.0",
+  "version": "1.4.1",
   "api": 2,
   "entry": "main.lua",
   "profile": "content",

tests/aa_shots.lua

@@ -0,0 +1,195 @@
+-- Driver: one scene, once per rung of the AA row.
+--
+-- The AA row is the one setting in this mod whose whole effect is a pixel
+-- wide, so it is also the one that cannot be judged from a description. This
+-- renders the SAME frame at each rung and writes one PNG per rung; put two of
+-- them side by side, magnified, and the row is either doing something or it
+-- is not.
+--
+--   POKEPORT_DRIVER=mods/DramaticShapeVoxelMod/tests/aa_shots.lua \
+--   SHOT_DIR=<dir> lovec.exe .
+--
+-- knobs (env):
+--   SHOT_DIR   output directory (created if missing)  (default "shots/aa")
+--   AA_MAP     map id                                 (default VIRIDIAN_CITY)
+--   AA_SPOT    "x,y[,facing]"                         (default 20,26,up)
+--   AA_RUNG    the voxel camera rung                  (default 5, the 75 one)
+--
+-- The scene defaults to a town at the LOW camera on purpose: roof ridges, the
+-- diagonal of a fence and a tree's silhouette against the sky are the edges
+-- that stair-step, and 75 degrees is the rung that puts the most of them at an
+-- angle to the pixel grid.
+--
+-- Determinism matters here for the same reason it does in voxel_shots_ab: the
+-- three shots differ ONLY by the row under test, or comparing them means
+-- nothing. The clock is pinned, the animated tile slots are frozen, the
+-- townsfolk are stopped where they stand, and the tilt-shift is held at zero
+-- (a gaussian over the frame would smear away the very edges being looked at).
+--
+-- Nothing here writes the player's options: the row is moved with
+-- ModSetting:sync, which moves the cached index and persists nothing.
+return function(game)
+  local U = dofile("tests/drivers/util.lua")
+  local Pipelines = require("src.render.Pipelines")
+  local OverworldState = require("src.world.OverworldController")
+
+  local ROOT = os.getenv("SHOT_DIR") or "shots/aa"
+
+  local handle = game.mods.exports["DRAMATIC_SHAPE"]
+  if not (handle and handle.lib) then
+    print("[aa] DRAMATIC_SHAPE mod not loaded -- nothing to shoot")
+    return
+  end
+  local V = handle.lib
+  local DayNight = V.require("DayNight")
+  local AntiAlias = V.require("AntiAlias")
+  local ChunkMesher = V.require("ChunkMesher")
+  local Voxel = V.require("VoxelState")
+  local ShadowMap = V.require("ShadowMap")
+
+  local MAP = os.getenv("AA_MAP") or "VIRIDIAN_CITY"
+  local SPOT = os.getenv("AA_SPOT") or "20,26,up"
+  local RUNG = math.floor(tonumber(os.getenv("AA_RUNG")) or 5)
+  local sx, sy, sf = SPOT:match("^(%-?%d+),%s*(%-?%d+),?%s*(%a*)$")
+  sx, sy = tonumber(sx) or 20, tonumber(sy) or 26
+  if sf == "" then sf = "up" end
+
+  OverworldState.rollEncounter = function() return nil end
+
+  local NPC = require("src.world.NPC")
+  if not NPC.dramaticShapeAaFreeze then
+    local inner = NPC.update
+    function NPC:update(...)
+      self.frozen = true
+      return inner(self, ...)
+    end
+    NPC.dramaticShapeAaFreeze = true
+  end
+  pcall(love.math.setRandomSeed, 20260801)
+
+  local TileRenderer = require("src.render.TileRenderer")
+  TileRenderer.tick = function() end
+  TileRenderer.animFrame = function() return 0 end
+
+  pcall(os.execute, 'mkdir -p "' .. ROOT .. '" 2>/dev/null')
+  pcall(os.execute, 'mkdir "' .. ROOT:gsub("/", "\\") .. '" 2>nul')
+
+  local Zoom = require("src.render.Zoom")
+  pcall(function()
+    game.save.options.zoom = 1
+    Zoom.applyOptions(game.save.options)
+  end)
+
+  local function cameraStill()
+    local o = game.overworld
+    local c = o and o.camera
+    if not c then return true end
+    local lx, ly, held = nil, nil, 0
+    for _ = 1, 300 do
+      if c.x == lx and c.y == ly then
+        held = held + 1
+        if held >= 10 then return true end
+      else
+        held = 0
+        lx, ly = c.x, c.y
+      end
+      U.wait(1)
+    end
+    return false
+  end
+
+  -- The camera PITCH, which is the one that caught this driver out. The tween
+  -- runs on wall-clock dt and Voxel.t reaching 1 is not the same instant the
+  -- angle stops moving, so the first shot of a run came out at 67 degrees
+  -- while the two after it were at 75 -- three frames that differ by the
+  -- camera, in a comparison whose entire subject is a pixel.
+  local function angleStill()
+    local last, held = nil, 0
+    for _ = 1, 600 do
+      if Voxel.angle == last then
+        held = held + 1
+        if held >= 10 then return true end
+      else
+        held = 0
+        last = Voxel.angle
+      end
+      U.wait(1)
+    end
+    return false
+  end
+
+  local function settle()
+    for _ = 1, 900 do
+      if ChunkMesher.pending() == 0 then break end
+      U.wait(1)
+    end
+    for _ = 1, 300 do
+      if Voxel.t >= 1 and Voxel.ready and ChunkMesher.pending() == 0 then break end
+      U.wait(1)
+    end
+    angleStill()
+    cameraStill()
+    -- the sun map is only redrawn when its inputs move, and the AA row is not
+    -- one of them -- so force one pass at the settled camera rather than
+    -- comparing a frame against a map fitted a few hundredths of a pixel ago
+    if ShadowMap.forget then ShadowMap.forget() end
+    U.wait(20)
+  end
+
+  DayNight.setting:sync("day")
+  U.teleport(game, MAP, sx, sy, sf)
+  Pipelines.setLevel("voxel", RUNG)
+  Pipelines.setLevel("tiltshift", 0)
+
+  -- Warm up before the FIRST shot, not just between them.
+  --
+  -- Neighbour maps are requested from inside the render itself
+  -- (VoxelScene.prefetch), so an empty build queue right after a teleport
+  -- means "nothing has been asked for yet", not "everything is here". The
+  -- first capture of a run came out with the map beyond Viridian missing --
+  -- a whole tree line absent from one frame of a three-way comparison, which
+  -- looks exactly like the row under test doing something enormous. Settling
+  -- twice lets the first render request the neighbourhood and the second
+  -- drain it.
+  settle()
+  settle()
+
+  local shots, missed = 0, 0
+  for _, samples in ipairs({ 0, 2, 4 }) do
+    AntiAlias.setting:sync(samples)
+    settle()
+    -- AA_TRACE=1 prints the state each shot was taken in. When two shots of a
+    -- run disagree by more than the row could account for, this is what says
+    -- which input moved -- it is how the camera-tween and the neighbour-mesh
+    -- settles above were both found.
+    if os.getenv("AA_TRACE") == "1" then
+      local Voxel3D = V.require("Voxel3D")
+      local o = game.overworld
+      local cw, chh = Voxel3D.size()
+      print(("[aa] trace samples=%d angle=%.6f fov=%.6f cell=%.4f canvas=%dx%d cam=(%.3f,%.3f) eye=(%.2f,%.2f,%.2f) factor=%.4f")
+        :format(samples, Voxel.angle or -1, Voxel3D.fovY or -1,
+                Voxel3D.cell or -1, cw or 0, chh or 0,
+                o and o.camera and o.camera.x or -1,
+                o and o.camera and o.camera.y or -1,
+                (Voxel3D.eye or {})[1] or 0, (Voxel3D.eye or {})[2] or 0,
+                (Voxel3D.eye or {})[3] or 0, AntiAlias.factor()))
+    end
+    local path = ("%s/aa_%d.png"):format(ROOT, samples)
+    game.capturePath = path
+    U.wait(6)
+    local f = io.open(path, "rb")
+    if f then
+      f:close()
+      shots = shots + 1
+      print(("[aa] %s  samples=%d"):format(path, samples))
+    else
+      missed = missed + 1
+      print("[aa] capture did not reach disk: " .. path)
+    end
+  end
+  -- left where it was found, so a run cannot leak a rung into the next one
+  AntiAlias.setting:sync(0)
+
+  print(("[aa] %d shots into %s (%d failed to reach disk)")
+    :format(shots, ROOT, missed))
+end

tests/dramatic_shape_test.lua

@@ -145,6 +145,9 @@ T.check(not fullIds["DRAMATIC_SHAPE:daytime"], "and DAYTIME")
 -- back sprite (or no staged fights at all) can still say so from inside FULL
 T.check(fullIds["DRAMATIC_SHAPE:battles"], "3D-BTL is still on the menu under FULL")
 T.check(fullIds["DRAMATIC_SHAPE:battleBack"], "and BACK SPRITES with it")
+-- and AA, for the opposite reason: it is not a knob on the look at all, it is
+-- what the look COSTS, and only the player knows what their machine can carry
+T.check(fullIds["DRAMATIC_SHAPE:aa"], "and AA, which FULL neither sets nor owns")
 
 -- DAYTIME is not only hidden under FULL, it is HELD at SYNC: the row cannot
 -- be reached while FULL owns it, so a value changed underneath (the mod
@@ -379,9 +382,11 @@ end
 Pipelines.setLevel("voxel", 2)
 local hookedRows = Runtime.call("ui.options.rows", function(_, r) return r end,
                                { data = Data }, { { id = "text_speed" } })
-T.eq(#hookedRows, 7, "the options hook added a row per setting")
+T.eq(#hookedRows, 8, "the options hook added a row per setting")
 local grid, curve, water = hookedRows[2], hookedRows[3], hookedRows[4]
 local battles, backRow, daytime = hookedRows[5], hookedRows[6], hookedRows[7]
+-- the AA row is hookedRows[8]; it is read in its own block below, because
+-- this chunk is one main function and has 200 local slots to spend
 T.eq(water.label, "WATER", "the water row carries its label")
 T.eq(water.value(), "FULL",
   "and defaults to FULL -- reflections are the point of having the row")
@@ -459,6 +464,57 @@ curve.step(settingGame, 1)
 curve.step(settingGame, 1)
 T.eq(curve.value(), "OFF", "the curve is left off for the rows below")
 
+-- ------- AA renders the pass larger and folds it back down
+--
+-- The ladder is SAMPLES per display pixel, so the canvas scale each rung asks
+-- for is its square root -- and the scale in force has to be readable after
+-- the fact, because two things are quoted in DISPLAY pixels and have to be
+-- multiplied up into the canvas the pass actually opened: the wireframe's
+-- line width and the FX overlay's sprite scale.
+do
+local AntiAlias = run.loader.exports.DRAMATIC_SHAPE.lib.require("AntiAlias")
+local VoxelGrid = run.loader.exports.DRAMATIC_SHAPE.lib.require("VoxelGrid")
+local aaGame = { save = { options = {} }, mods = { modOptions = {} } }
+local aa = hookedRows[8]
+T.eq(aa.label, "AA", "the anti-aliasing row carries its label")
+T.eq(aa.value(), "OFF",
+  "and starts off -- supersampling is a cost knob, and a mod must not spend "
+  .. "four times the fill rate of the machine it lands on unasked")
+
+T.eq(AntiAlias.samples(), 0, "AA is off by default")
+local w, h = AntiAlias.expand(320, 200)
+T.eq(w, 320, "an OFF row renders at the window's own width")
+T.eq(h, 200, "and its height")
+T.eq(AntiAlias.factor(), 1, "with nothing to multiply display pixels by")
+T.eq(VoxelGrid.width(), VoxelGrid.WIDTH,
+  "so the wireframe is the one-display-pixel line it has always been")
+
+aa.step(aaGame, 1)
+T.eq(aa.value(), "2X", "stepping the row climbs to two samples a pixel")
+T.eq(aaGame.save.options.modOptions.DRAMATIC_SHAPE.aa, 2,
+  "the sample count persists beside the other settings, not over them")
+w, h = AntiAlias.expand(320, 200)
+T.eq(w, 453, "two samples a pixel is a canvas root-two wider")
+T.eq(h, 283, "and root-two taller")
+T.check(math.abs(AntiAlias.factor() - 453 / 320) < 1e-9,
+  "and the factor is what it MEASURED, not what the row asked for")
+
+aa.step(aaGame, 1)
+T.eq(aa.value(), "4X", "and again to four")
+w, h = AntiAlias.expand(320, 200)
+T.eq(w, 640, "four samples a pixel is a canvas exactly twice the size")
+T.eq(h, 400, "in each direction, which is the 2x2 box the fold reads")
+T.eq(AntiAlias.factor(), 2, "with everything in display pixels doubled")
+T.eq(VoxelGrid.width(), VoxelGrid.WIDTH * 2,
+  "the wireframe among them -- a seam left at 1.0 would fold down to half a "
+  .. "line, so the smoothing row would appear to fade the grid row out")
+
+aa.step(aaGame, 1)
+T.eq(aa.value(), "OFF", "and the ladder wraps back to off")
+AntiAlias.expand(320, 200)
+T.eq(AntiAlias.factor(), 1, "leaving nothing behind for the next pass")
+end
+
 -- ------- the animated terrain atlas survives an engine without its seams
 --
 -- Regression: cycling palette modes with voxel mode on eventually killed
@@ -2476,7 +2532,35 @@ T.check(onAt["DRAMATIC_SHAPE:battleBack"], "switched back on, so is the row")
 T.eq(onAt["DRAMATIC_SHAPE:battleBack"] - onAt["DRAMATIC_SHAPE:battles"], 1,
   "directly under the row it belongs to")
 
+-- ------- and which pic is the pinned one is asked with the other side BLANKED
+--
+-- picImage asks this so BattlePics knows whether a pic's feet are on the text
+-- box -- where its bottom edge seals, and its belly stops being see-through --
+-- and it is asked DURING the billboard render, inside which sideTexture has
+-- switched the side it is not drawing off by setting the field to FALSE rather
+-- than to nil (see OFF).
+--
+-- So the read has to be by truthiness. A test against nil passes that `false`
+-- through to the index below it, the error comes back out of sideTexture into
+-- the pcall that calls it, textures() reports no card for the side -- and the
+-- foe is simply not on the field. Which is the whole bug: fixing the player's
+-- back pic took the enemy's billboard out.
+local mine, theirs = {}, {}
+local live = { player = { sprite = mine }, enemy = { sprite = theirs } }
+T.eq(Battles.pinnedPic(live, mine), true,
+  "the player's own mon is the pic on the box")
+T.eq(Battles.pinnedPic(live, theirs), false,
+  "and the foe is geometry out on the map, whatever the mode")
+T.eq(Battles.pinnedPic({ player = false, enemy = { sprite = theirs } }, theirs),
+  false, "asking about the foe while the player is blanked answers, not throws")
+T.eq(Battles.pinnedPic({ playerBackPic = mine }, mine), true,
+  "the trainer back holds the slot until Go!, on the box like the mon")
+T.eq(Battles.pinnedPic({ player = false, playerBackPic = false }, mine), false,
+  "and with the side blanked outright nothing of it is pinned")
+
 Battles.backSetting:setIndex(1, backGame)          -- and off for the rows below
+T.eq(Battles.pinnedPic(live, mine), false,
+  "with BACK SPRITES off the player's mon is out on the map with the foe")
 end
 
 -- ------- the hour reaches the FLAT world too
@@ -2611,21 +2695,35 @@ local BattlePics = run.loader.exports.DRAMATIC_SHAPE.lib.require("BattlePics")
 -- reader over what came out. The pic is faked at the readback seam, which is
 -- the only thing between this and the pixels the engine would have blitted.
 local lastCanvas = nil                  -- what the readback asked newCanvas for
-local function fill(rows)
+-- '#' is ink and '.' the keyed-out nothing. 'W' is ink too, of the pic's
+-- LIGHTEST shade -- a highlight the decoder happened not to key -- which is
+-- what the paper a hole gets filled with is read off.
+local SHADE = { ["#"] = 0.25, ["W"] = 0.75 }
+-- reuse hands the SAME pic back through, which is how the two bottom rules
+-- can be asked of one image the way a running battle would ask them
+local function fill(rows, sealBottom, reuse)
   local W, H = #rows[1], #rows
   local built = nil
   local function fakeData()
-    local px = {}
+    local px, sh = {}, {}
     for y = 0, H - 1 do
       for x = 0, W - 1 do
-        px[y * W + x] = rows[y + 1]:sub(x + 1, x + 1) == "#" and 1 or 0
+        local shade = SHADE[rows[y + 1]:sub(x + 1, x + 1)]
+        px[y * W + x] = shade and 1 or 0
+        sh[y * W + x] = shade or 0
       end
     end
     return {
-      px = px,
+      px = px, sh = sh,
       getDimensions = function() return W, H end,
-      getPixel = function(self, x, y) return 0, 0, 0, self.px[y * W + x] end,
-      setPixel = function(self, x, y, r, g, b, a) self.px[y * W + x] = a end,
+      getPixel = function(self, x, y)
+        local k = y * W + x
+        return self.sh[k], self.sh[k], self.sh[k], self.px[k]
+      end,
+      setPixel = function(self, x, y, r, g, b, a)
+        self.px[y * W + x] = a
+        self.sh[y * W + x] = r
+      end,
     }
   end
 
@@ -2639,12 +2737,14 @@ local function fill(rows)
     built = data
     return { setFilter = function() end }
   end
-  local pic = { getDimensions = function() return W, H end }
-  local out = BattlePics.filled(pic)
+  local pic = reuse or { getDimensions = function() return W, H end }
+  local out = BattlePics.filled(pic, sealBottom)
   love.graphics.newCanvas, love.graphics.newImage = realNewCanvas, realNewImage
   -- deliberately NOT invalidated: each figure brings its own pic, and the
   -- cache check at the bottom needs one of them still in there
-  return out, pic, built and function(x, y) return built.px[y * W + x] > 0.5 end
+  return out, pic,
+         built and function(x, y) return built.px[y * W + x] > 0.5 end,
+         built and function(x, y) return built.sh[y * W + x] end
 end
 
 -- ------- the cut at the feet, which is what the closed bottom edge is for
@@ -2727,6 +2827,75 @@ local drainOut, drainPic, drain = fill({
 T.check(drainOut ~= drainPic and drain and drain(8, 4),
   "a narrow one is where the drawing ran out, and is paper")
 
+-- ------- but a pic ON THE MENU has no mouth at all
+--
+-- The drain/mouth cut is for a pic standing on the MAP, where a wide opening
+-- along the bottom is a stride with real ground behind it. Under BACK SPRITES
+-- the player's mon is drawn in the GB's own slot with its feet flush on the
+-- text box, and the only thing under its lowest row is white box -- so nothing
+-- reaches it from below, whatever the opening's width, and the rule stops
+-- being a heuristic: paper is whatever the background cannot walk to from the
+-- left, the right or the top.
+--
+-- Which is the difference between a Pikachu and a wireframe. The pale-bodied
+-- back pics -- Pikachu, Seel, Dewgong, Chansey, Jigglypuff -- are drawn as
+-- OUTLINES, every shade-0 pixel inside the ink keyed away, and each of them
+-- leaks out through a bottom opening far too wide to read as a drain. On the
+-- map that reading is right; on the box it left the mon a rim with the arena
+-- showing through it.
+--
+-- The same stride figure the map rule leaves open, now standing on the box.
+local boxOut, boxPic, boxOpaque = fill({
+  "..##############..",
+  "..##############..",
+  "..##############..",
+  "..###........###..",
+  "..###........###..",
+  "..###........###..",
+}, true)
+T.check(boxOut ~= boxPic and boxOpaque,
+  "the gap a stride would have shown the world through is paper on the box")
+T.check(boxOpaque(8, 3) and boxOpaque(8, 5),
+  "and it fills right down to the row the feet are on")
+
+-- the seal is the BOTTOM alone: the sides and the top still let the background
+-- in, which is what keeps the silhouette cutting against the arena instead of
+-- standing the mon in a white block
+local boxGapOut, boxGapPic = fill({
+  "..#####.",
+  "..#...#.",
+  "..#...#.",
+  "....###.",   -- opens at the left, and drains out that way
+  "..#####.",
+  "..#####.",
+}, true)
+T.eq(boxGapOut, boxGapPic,
+  "a pocket that drains out to the side is background on the box too")
+
+-- ------- and a hole is filled with the pic's OWN paper, not with white
+--
+-- Shade 0 is white only while the pic is still grays, and by the time one
+-- reaches here it usually is not: picImage hands it over after the bake -- a
+-- species SGB colour, a BGP fade mid-animation, PAL_BLACK across the whole
+-- screen while the blackout text is up -- and shade 0 travels with the rest.
+-- A hardcoded white belly would be the one lit thing on a blacked-out mon.
+--
+-- So the paper is read off the pic: the lightest shade still standing in it,
+-- which is shade 0 wherever the decoder could not reach one. It never has to
+-- guess -- all 151 of this game's back pics keep at least one, an eye or a
+-- highlight down a cheek.
+local _, _, _, paperShade = fill({
+  "..####..",
+  "..#WW#..",   -- a highlight the decoder did not key: this is the paper
+  "..#..#..",
+  "..#..#..",
+  "..####..",
+})
+T.eq(paperShade(3, 2), paperShade(3, 1),
+  "the hole takes the lightest shade the pic still has")
+T.check(paperShade(3, 2) ~= paperShade(2, 2),
+  "which is not the ink beside it")
+
 -- ------- and the readback is measured in PIXELS, which is what kept the mons
 -- the size of the squares they stand on
 --
@@ -2743,12 +2912,31 @@ T.check(drainOut ~= drainPic and drain and drain(8, 4),
 -- scale that was wrong everywhere.
 T.check(lastCanvas and lastCanvas.opts and lastCanvas.opts.dpiscale == 1,
   "the readback canvas is one texel per pic pixel, on a highdpi phone too")
-T.eq(lastCanvas.w, 18, "and it is the size of the pic, in those pixels")
+T.eq(lastCanvas.w, 8, "and it is the size of the pic, in those pixels")
 
 -- the answer is cached on the image, so a pic costs one readback a session
 -- rather than one a frame -- checked on the first figure, which is still in
 -- there because fill() does not clear it
 T.eq(BattlePics.filled(pic), out, "the rebuilt pic is cached on the original")
+-- and cached PER BOTTOM RULE, because one image answers differently on the map
+-- and on the box. A single table for both would hand whichever caller asked
+-- second the other one's answer -- the map's stencil to the menu, or a menu
+-- fill to a mon standing on grass -- which is this section's bug arriving
+-- through the cache rather than through the flood.
+--
+-- The stride figure again, on the SAME pic the map rule already answered for.
+local reOut = fill({
+  "..##############..",
+  "..##############..",
+  "..##############..",
+  "..###........###..",
+  "..###........###..",
+  "..###........###..",
+}, true, stridePic)
+T.check(reOut ~= stridePic,
+  "the pic the map left open still fills when the box asks for it")
+T.eq(BattlePics.filled(stridePic), stridePic,
+  "and the map's own answer for it is still the pic itself")
 BattlePics.invalidate()
 end
 

tools/building_voxels.py

@@ -547,6 +547,98 @@ TEMPLATES = {
         roof_rows=17, roof_back=5, roof_front=3, roof_cycle=(5, 9),
         slab=4, front_eave=4, ledge=None, tileset="forest",
     ),
+    # F01: the starter-ball table in Oak's lab -- the first FURNITURE
+    # through the pipeline, and the first drawing whose plot is smaller
+    # than its grid. Rows 0-15 are the tabletop seen from above; 16-18
+    # are the top slab's own front edge (black/#555/black -- exactly
+    # what the rim treatment paints, so slab=3 and those rows fold into
+    # the roof band instead of extruding); 19-21 are the base: corner
+    # feet and the inset dark panel between them. The legs stand on
+    # open FLOOR, so the measured ground line lands two rows short of
+    # the grid; `depth` keeps the plot to the blocked cell row -- the
+    # legs row of the grid is the walkable cell the player faces the
+    # table from, and D = len(tiles) would stand the model in their
+    # path. 16 top rows onto a 16px plot map 1:1: no cycling, and
+    # roof_cycle is unreachable behind roof_back=16.
+    "lab_table": dict(
+        tiles=[
+            [41, 59, 59, 59, 59, 42],
+            [78, 57, 57, 57, 57, 79],
+            [88, 89, 89, 89, 89, 90],
+        ],
+        roof_rows=19, roof_back=16, roof_front=0, roof_cycle=(2, 13),
+        slab=3, front_eave=0, ledge=None, tileset="gym", depth=2,
+    ),
+    # F02: the computer desk in Oak's lab -- and the Hall of Fame's
+    # recording machine, the same drawing on the GYM atlas (one
+    # placement each; both registered in voxel_heights). The one
+    # DESK-SET template: the methodology's region classification at
+    # part granularity. The desk is the sibling lab table (fascia rows
+    # 16-18, base 19-21); on it stand a monitor over its keyboard
+    # (left), a computer tower over a keyboard and mouse (middle), and
+    # a sheet of paper LYING FLAT (right). Upright parts anchor their
+    # drawn bottom row to the desk's top plane and wear their own drawn
+    # tops as lids; flat parts lie one voxel proud with drawn row =
+    # depth row -- the same 1:1 the tabletop itself is drawn with, so
+    # an object's height ON the drawing is its position ON the desk.
+    # The desk's own top is the one synthesized surface (the objects
+    # cover every pixel of it), continued from the sibling tables'
+    # pattern in the drawing's own shades.
+    "lab_computers": dict(
+        tiles=[
+            [91, 92, 93, 94],
+            [54, 55, 85, 95],
+            [88, 89, 89, 90],
+        ],
+        roof_rows=0, roof_back=0, roof_front=0, roof_cycle=(0, 0),
+        slab=0, front_eave=0, ledge=None, tileset="gym", depth=2,
+        desk=dict(fascia=(16, 18), base=(19, 21)),
+        parts=[
+            dict(kind="upright", x=(2, 13), top=(0, 2), facade=(3, 10),
+                 depth=4),                                   # the monitor
+            dict(kind="flat", x=(1, 13), rows=(11, 14)),     # its keyboard
+            dict(kind="upright", x=(14, 21), top=(0, 3), facade=(4, 10),
+                 depth=6),                                   # the tower
+            dict(kind="flat", x=(14, 21), rows=(11, 14)),    # keys + mouse
+            dict(kind="flat", x=(22, 30), rows=(1, 14)),     # the paper
+        ],
+    ),
+    # F03: the empty north table beside it -- the starter table's band
+    # table verbatim on a grid two tiles narrower (one placement).
+    "lab_table_small": dict(
+        tiles=[
+            [41, 59, 59, 42],
+            [78, 57, 57, 79],
+            [88, 89, 89, 90],
+        ],
+        roof_rows=19, roof_back=16, roof_front=0, roof_cycle=(2, 13),
+        slab=3, front_eave=0, ledge=None, tileset="gym", depth=2,
+    ),
+    # F04: the Pokemon Center's PC -- every Center's northeast corner
+    # (11 placements) plus the Indigo Plateau lobby, whose MART tileset
+    # shares this atlas. The lab desk-set read again: a
+    # Mac-style unit drawn face-on -- white top band (rows 0-3), bezel,
+    # screen and drive slot (4-14) -- standing at the back of a low
+    # desk whose front face is rows 20-23 and whose drawn top (the
+    # white sliver of row 15 and the margins beside the unit) names the
+    # lid shade. The keyboard rows 17-19 lie BELOW the desk's 16px top
+    # span, so the flat part carries an authored z origin: it lies at
+    # the desk's front edge, in front of the unit.
+    "center_pc": dict(
+        tiles=[
+            [66, 70],
+            [82, 86],
+            [9, 88],
+        ],
+        roof_rows=0, roof_back=0, roof_front=0, roof_cycle=(0, 0),
+        slab=0, front_eave=0, ledge=None, tileset="pokecenter", depth=2,
+        desk=dict(fascia=(20, 21), base=(22, 23), lid="white"),
+        parts=[
+            dict(kind="upright", x=(2, 13), top=(0, 3), facade=(4, 14),
+                 depth=6),                                   # the unit
+            dict(kind="flat", x=(2, 13), rows=(17, 19), z=13),  # keyboard
+        ],
+    ),
     # B23: the Victory Road entrance on Route 23: a rock face with two
     # barred doors. The roof band is the pale cliff top seen from above.
     "victory_road_gate": dict(
@@ -642,7 +734,14 @@ def profile(sp, t):
         r = next((y for y in range(H) if inside(x, y)), t["roof_rows"])
         top.append(min(r, t["roof_rows"]))
 
-    wall_h = H - t["roof_rows"]
+    # The drawing's own ground line: the row after the last drawn one. A
+    # building ends on the black threshold row it stands on (ground == H),
+    # but furniture is drawn standing on open floor -- the lab table's
+    # legs stop two rows short of its grid -- and extruding against H
+    # would float it that far above its own plot.
+    ground = max((y for y in range(H) for x in range(W) if inside(x, y)),
+                 default=H - 1) + 1
+    wall_h = ground - t["roof_rows"]
     ytop = wall_h - 1 + t["slab"]
 
     # Recesses: the panes the art seals behind a black frame. Non-black
@@ -674,15 +773,136 @@ def profile(sp, t):
             if x1 - x0 + 1 <= RECESS_MAX and y1 - y0 + 1 <= RECESS_MAX:
                 recess.update(cells)
 
+    # Depth is the PLOT. For a whole-drawing building that is the grid
+    # itself; `depth` (in tile rows) names it when the grid runs past the
+    # plot onto ground the drawing merely stands its legs on.
     return dict(top=top, wall_h=wall_h, ytop=ytop, recess=recess,
-                inside=inside, D=H, W=W, H=H)
+                inside=inside, D=t.get("depth", len(t["tiles"])) * 8,
+                ground=ground, W=W, H=H)
 
 
 # --------------------------------------------------------------- stage 3 --
+def build_desk_set(sp, pr, t):
+    """A desk with separately-classified objects on it (the `parts` list):
+    upright parts stand on the desk's top plane wearing their own drawn
+    tops as lids, flat parts lie one voxel proud at drawn row = depth row,
+    and the desk itself is the lab-table slab + base with a synthesized
+    lid (the objects cover every drawn pixel of the tabletop)."""
+    W, H, D = pr["W"], pr["H"], pr["D"]
+    inside = pr["inside"]
+    col, src = sp["col"], sp["src"]
+    ground = pr["ground"]
+    vox = {}
+
+    def put(x, y, z, sx, sy):
+        vox[(x, y, z)] = (col[sy][sx], src[sy][sx])
+
+    shade_px = {}
+    for sy in range(H):
+        for sx in range(W):
+            if inside(sx, sy):
+                shade_px.setdefault(col[sy][sx], (sx, sy))
+
+    def interior(sx, sy, lo, hi):
+        if col[sy][sx] != BLACK:
+            return sx
+        step = 1 if sx < (lo + hi) // 2 else -1
+        for d in range(1, 4):
+            nx = sx + step * d
+            if lo <= nx <= hi and inside(nx, sy) and col[sy][nx] != BLACK:
+                return nx
+        return sx
+
+    f0, f1 = t["desk"]["fascia"]
+    b0, b1 = t["desk"]["base"]
+    plane = (b1 - b0 + 1) + (f1 - f0 + 1)       # the desk's top plane
+
+    # the base band, extruded exactly like every lab table's
+    for sy in range(b0, b1 + 1):
+        y = ground - 1 - sy
+        for sx in range(W):
+            if not inside(sx, sy):
+                continue
+            ix = interior(sx, sy, 0, W - 1)
+            for z in range(D):
+                put(sx, y, z, sx if z in (0, D - 1) else ix, sy)
+    for sx, sy in pr["recess"]:
+        if b0 <= sy <= b1:
+            vox.pop((sx, ground - 1 - sy, D - 1), None)
+
+    # the slab: the fascia rows wrap every side; the lid is the one
+    # synthesized surface in the model -- the drawing never paints the
+    # tabletop (its objects cover it), so the lid continues the sibling
+    # tables' pattern in the drawing's own shades: black rim, white
+    # highlight courses along the north and west, grey field
+    for i, sy in enumerate(range(f0, f1 + 1)):
+        y = plane - 1 - i
+        for sx in range(W):
+            for z in range(D):
+                put(sx, y, z, sx, sy)
+    field = WHITE if t["desk"].get("lid") == "white" else GREY
+    for sx in range(W):
+        for z in range(D):
+            if sx in (0, W - 1) or z in (0, D - 1):
+                shade = BLACK
+            elif sx == 1 or z == 1:
+                shade = WHITE
+            else:
+                shade = field
+            px = shade_px.get(shade) or shade_px[BLACK]
+            put(sx, plane - 1, z, px[0], px[1])
+
+    for p in t["parts"]:
+        x0, x1 = p["x"]
+        if p["kind"] == "flat":
+            r0, r1 = p["rows"]
+            for sy in range(r0, r1 + 1):
+                # drawn row = depth row by default; `z` renames the
+                # origin when the flat sits below the desk's own drawn
+                # top span (the Center PC's keyboard)
+                z = p.get("z", r0) + (sy - r0)
+                if not 0 <= z < D:
+                    continue
+                for sx in range(x0, x1 + 1):
+                    if inside(sx, sy):
+                        put(sx, plane, z, sx, sy)
+            continue
+        tr0, tr1 = p["top"]
+        fr0, fr1 = p["facade"]
+        pd = p["depth"]
+        ytp = plane + (fr1 - fr0)
+        for sx in range(x0, x1 + 1):
+            # the lid: the part's drawn top laid across its depth from
+            # the back, last row continuing forward; the front lid row
+            # is the facade's own top row -- the drawn front-top edge
+            for z in range(pd):
+                sy = fr0 if z == pd - 1 else min(tr0 + z, tr1)
+                while sy <= tr1 and not inside(sx, sy):
+                    sy += 1
+                if sy > tr1 and not (z == pd - 1 and inside(sx, fr0)):
+                    continue
+                put(sx, ytp, z, sx, fr0 if z == pd - 1 else sy)
+            # the body: facade rows anchored to the desk's top plane
+            for sy in range(fr0 + 1, fr1 + 1):
+                y = plane + (fr1 - sy)
+                if not inside(sx, sy):
+                    continue
+                ix = interior(sx, sy, x0, x1)
+                for z in range(pd):
+                    if z == pd - 1:
+                        if (sx, sy) not in pr["recess"]:
+                            put(sx, y, z, sx, sy)
+                    else:
+                        put(sx, y, z, sx if z == 0 else ix, sy)
+    return vox
+
+
 def build(sp, pr, t):
     """The voxel model. Order is load-bearing: walls, ledge, recesses, then
     the roof solid overwrites what it intersects and the walls are trimmed
     to the roof's underside."""
+    if t.get("parts"):
+        return build_desk_set(sp, pr, t)
     W, H, D = pr["W"], pr["H"], pr["D"]
     inside, top, ytop = pr["inside"], pr["top"], pr["ytop"]
     col, src = sp["col"], sp["src"]
@@ -720,7 +940,9 @@ def build(sp, pr, t):
 
     # ---- walls: the facade rows extruded straight back, trimmed under the roof
     for sy in range(t["roof_rows"], H):
-        y = H - 1 - sy
+        y = pr["ground"] - 1 - sy       # rows below the ground line are floor
+        if y < 0:
+            continue
         for sx in range(W):
             if not inside(sx, sy) or trimmed(sx, y):
                 continue
@@ -742,7 +964,7 @@ def build(sp, pr, t):
     if t["ledge"]:
         l0, l1 = t["ledge"]
         for sy in range(l0, l1 + 1):
-            y = H - 1 - sy
+            y = pr["ground"] - 1 - sy
             for sx in range(W):
                 if inside(sx, sy) and not trimmed(sx, y):
                     for z in (-2, -1, D, D + 1):
@@ -750,7 +972,7 @@ def build(sp, pr, t):
 
     # ---- recesses: the front voxel of every pane sinks, its frame stays proud
     for sx, sy in pr["recess"]:
-        vox.pop((sx, H - 1 - sy, D - 1), None)
+        vox.pop((sx, pr["ground"] - 1 - sy, D - 1), None)
 
     # ---- roof: flat top over the plateau, stepped diagonal ends
     z0, z1 = 0, D - 1 + t["front_eave"]
@@ -805,6 +1027,83 @@ def verify(vox, sp, pr, t):
     for (x, y, z), _ in vox.items():
         assert y <= T(x), f"voxel pokes through the roof at {x},{y},{z}"
 
+    # A desk set answers its own asserts; a facade-only template (roof_rows
+    # == 0) has no roof band, so there is no surface to hold level or slope
+    # and no coverage to demand of it; everything with a roof band answers
+    # the full set.
+    if t.get("parts"):
+        verify_desk_set(vox, pr, t)
+    elif t["roof_rows"] == 0:
+        # its one geometric intent: a straight extrusion, so each column
+        # of the drawing is solid from its lowest voxel to its top. NOT
+        # from the ground -- the drawing's base band is inset like every
+        # lab table's, and the body's outer columns legitimately
+        # overhang it -- and not on the recess layer, which sinks panes.
+        lo, hi = {}, {}
+        for (x, y, z) in vox:
+            lo[(x, z)] = min(lo.get((x, z), y), y)
+            hi[(x, z)] = max(hi.get((x, z), y), y)
+        for (x, z), h in hi.items():
+            if z == D - 1:
+                continue
+            assert all((x, y, z) in vox for y in range(lo[(x, z)], h + 1)), \
+                f"facade column has a hole at {x},{z}"
+    else:
+        verify_roof(vox, pr, t)
+
+    shell = [k for k in vox if not all(
+        (k[0] + d[0], k[1] + d[1], k[2] + d[2]) in vox
+        for d in ((1, 0, 0), (-1, 0, 0), (0, 1, 0),
+                  (0, -1, 0), (0, 0, 1), (0, 0, -1)))]
+    return shell
+
+
+def verify_desk_set(vox, pr, t):
+    W, D = pr["W"], pr["D"]
+    f0, f1 = t["desk"]["fascia"]
+    b0, b1 = t["desk"]["base"]
+    plane = (b1 - b0 + 1) + (f1 - f0 + 1)
+
+    # the slab is a full solid under everything on it
+    for x in range(W):
+        for z in range(D):
+            for y in range(b1 - b0 + 1, plane):
+                assert (x, y, z) in vox, f"slab hole at {x},{y},{z}"
+
+    # each part stands where authored -- upright bodies solid from the
+    # desk to their own drawn top (bar the front layer, whose panes
+    # sink) -- and nothing stands anywhere else
+    tops = {}
+    for p in t["parts"]:
+        x0, x1 = p["x"]
+        if p["kind"] == "flat":
+            r0, r1 = p["rows"]
+            z0 = p.get("z", r0)
+            for x in range(x0, x1 + 1):
+                for z in range(max(z0, 0), min(z0 + r1 - r0, D - 1) + 1):
+                    tops[(x, z)] = max(tops.get((x, z), 0), plane)
+        else:
+            fr0, fr1 = p["facade"]
+            ytp = plane + (fr1 - fr0)
+            for x in range(x0, x1 + 1):
+                for z in range(p["depth"]):
+                    tops[(x, z)] = max(tops.get((x, z), 0), ytp)
+                    if z == p["depth"] - 1:
+                        continue
+                    ys = [y for y in range(plane, ytp + 1)
+                          if (x, y, z) in vox]
+                    assert ys == list(range(ys[0], ys[0] + len(ys))) \
+                        if ys else True, f"part column hole at {x},{z}"
+    for (x, y, z) in vox:
+        assert y <= tops.get((x, z), plane - 1), \
+            f"voxel above its part at {x},{y},{z}"
+
+
+def verify_roof(vox, pr, t):
+    W, H, D = pr["W"], pr["H"], pr["D"]
+    ytop, top, slab = pr["ytop"], pr["top"], t["slab"]
+    T = lambda x: ytop - top[max(0, min(W - 1, x))]
+
     # The roof surface reads over the columns the drawing actually paints:
     # a sprite inset from its box says nothing about the rest.
     roofed = [x for x in range(W) if top[x] < t["roof_rows"]]
@@ -845,12 +1144,6 @@ def verify(vox, sp, pr, t):
             elif any((x, y, z) in vox for y in range(0, T(x) - slab + 1)):
                 assert (x, T(x), z) in vox, f"wall uncovered at {x},{z}"
 
-    shell = [k for k in vox if not all(
-        (k[0] + d[0], k[1] + d[1], k[2] + d[2]) in vox
-        for d in ((1, 0, 0), (-1, 0, 0), (0, 1, 0),
-                  (0, -1, 0), (0, 0, 1), (0, 0, -1)))]
-    return shell
-
 
 def preview(shell, vox, sp, name, out, flip, canvas=(1700, 900), pad=20):
     # Mirroring depth swings the camera round to the other side. Mirror