Tutorial: crisp wave rows

- Pixels tinted by the green filler take the nearest clean pixel's colour and
  keep their own coverage (the neighbourhood average smeared the joints)
- The background layers are drawn at whole pixels: between pixels, filtering
  softened them and darkened their edges

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Scripts/background/bg_collabs/tutorial.lua

@@ -37,12 +37,17 @@ local function at(track, list, f, n)
     return track[list][(f % n) + 1]
 end
 
+-- whole pixels: drawn between pixels, the filtered layers came out soft
+local function px(v)
+    return math.floor(v + 0.5)
+end
+
 -- a strip whose x / y follow its track; rows above the top band are cut off
 function TutorialBackground:strip(name, track_name, f)
     local tr = TRACKS[track_name]
-    local x = at(tr, "x", f, tr.n)
+    local x = px(at(tr, "x", f, tr.n))
     local y = name == "pat" and 0 or (name == "mtn" and 0 or at(tr, "y", f, 120))
-    local top = y + L[name].ytop
+    local top = px(y + L[name].ytop)
     local cut = math.max(0, BAND_TOP - top)
     tex.draw_texture(self.id[name], {
         x = x, y = top + cut, y2 = -cut,
@@ -70,7 +75,7 @@ function TutorialBackground:draw_back()
     local cx = at(TRACKS.cloud, "x", f, TRACKS.cloud.n)
     local cy = at(TRACKS.c9, "y", f, 120) - CLOUD_Y0
     for k = 0, CLOUD_COUNT - 1 do
-        tex.draw_texture(self.id.cloud, { x = cx + CLOUD_X0 + CLOUD_PITCH * k + L.cloud.dx, y = cy + L.cloud.dy })
+        tex.draw_texture(self.id.cloud, { x = px(cx + CLOUD_X0 + CLOUD_PITCH * k + L.cloud.dx), y = px(cy + L.cloud.dy) })
     end
     self:strip("w13", "w13", f)
     self:strip("w16", "w16", f)

Scripts/song_select/file_navigator/box_folder.lua

@@ -26,6 +26,15 @@ local SORT_FOLDER_NAMES  = { ["曲検索"] = true, ["Search Song"] = true, ["搜
                              ["むずかしさからえらぶ"] = true, ["Diff Sort"] = true }
 local FOLDER_FRAME_EVENT, FOLDER_FRAME_SORT, FOLDER_FRAME_DANI = 11, 12, 10
 
+-- The tutorial folder (GENRE:TUTORIAL, genre index 0) is a howto board: the recent
+-- board's colours with its own characters (box_chara frame 10).
+local GENRE_TUTORIAL = 0
+local FOLDER_FRAME_HOWTO, CHARA_FRAME_HOWTO = 9, 10
+
+local function is_tutorial(box)
+    return box.genre_index ~= nil and box:genre_index() == GENRE_TUTORIAL
+end
+
 local SORT_COLLECTIONS  = { SEARCH = true, DIFFICULTY = true }
 local EVENT_COLLECTIONS = { NEW = true, RECOMMENDED = true }
 
@@ -39,6 +48,7 @@ local function folder_frame(box)
     end
     if box.kind and box:kind() == "dan" then return FOLDER_FRAME_DANI, false end
     if n and SORT_FOLDER_NAMES[n]  then return FOLDER_FRAME_SORT, false end
+    if is_tutorial(box) then return FOLDER_FRAME_HOWTO, false end
     return box:genre_frame(), false
 end
 
@@ -115,7 +125,7 @@ function SongSelect:draw_folder_board(box, pb, ch_alpha, ch_off, ta, glow_a)
     -- characters: texture has L at x=510 and R at x=1410
     if ch_alpha > 0 then
         local slide = 450.0 - ch_off
-        local gframe = box:genre_frame()
+        local gframe = is_tutorial(box) and CHARA_FRAME_HOWTO or box:genre_frame()
         tex.draw_texture(self._id_box_chara, { frame = gframe, x = bx - 960 + slide, y = by - 240, x2 = 960 - 1920, fade = fade * ch_alpha,
                                                src = { x = 0, y = 0, width = 960, height = 480 } })
         tex.draw_texture(self._id_box_chara, { frame = gframe, x = bx - slide, y = by - 240, x2 = 960 - 1920, fade = fade * ch_alpha,

checksums.sha256

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