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src/render/SpriteRenderer.lua

@@ -18,10 +18,49 @@ local function getImage(path)
   return imageCache[path]
 end
 
+-- RED++ overworld sprite OBJ-palette recolor (color/sprites.asm
+-- ColorOverworldSprite), baked into an ImageData like BattleState's mon-pic
+-- palette bake (src/battle/BattleState.lua getImage): CPU-remap the 4 DMG
+-- shades to the resolved OBP colors, cached per (image path, group).
+--
+-- Sprite sheets carry no real alpha (every pixel, including the
+-- background, is opaque -- confirmed by sampling the extracted PNGs): the
+-- "transparent" look in every other draw path is a coincidence of the
+-- whole-canvas shade-remap shader, where shade 0 (white) happens to map to
+-- a similarly light color in whatever terrain zone the sprite stands over.
+-- That coincidence breaks once terrain is colored per-tile instead of one
+-- flat color per map (different tiles can have very different color-0s),
+-- so shade 0 is keyed to alpha 0 here explicitly -- matching real GBC OBJ
+-- hardware, where sprite palette index 0 is unconditionally transparent
+-- (same rule TileRenderer's getColor0KeyShader documents for tall grass).
+local obpCache = {}
+
+local function getObpImage(path, colors, group)
+  local key = path .. "#obp" .. group
+  if not obpCache[key] then
+    local img
+    if love.image and love.image.newImageData then
+      local id = Assets.imageData(path)
+      id:mapPixel(function(_, _, r, g, b, a)
+        if a == 0 then return r, g, b, a end
+        if r > 0.83 then return r, g, b, 0 end -- OBJ color 0: always transparent
+        local col = r > 0.5 and colors[2] or r > 0.17 and colors[3] or colors[4]
+        return col[1] / 255, col[2] / 255, col[3] / 255, a
+      end)
+      img = love.graphics.newImage(id)
+    else
+      img = getImage(path) -- headless stub: no pixel access
+    end
+    obpCache[key] = img
+  end
+  return obpCache[key]
+end
+
 -- hot reload drops the sheets; live instances hold their own image, so
 -- the world rebuilds them (MapLoader.invalidateAll) rather than this
 function SpriteRenderer.invalidate()
   imageCache = {}
+  obpCache = {}
 end
 
 Assets.register(SpriteRenderer.invalidate)
@@ -29,9 +68,12 @@ Assets.register(SpriteRenderer.invalidate)
 local STAND = { down = 0, up = 1, left = 2, right = 2 }
 local WALK = { down = 3, up = 4, left = 5, right = 5 }
 
-function SpriteRenderer.new(spriteDef)
+-- seed: any stable per-instance value (e.g. an NPC's `id`) used to resolve
+-- RED++'s per-instance "random" OBP sentinel (PaletteFX.spriteObp)
+function SpriteRenderer.new(spriteDef, seed)
   local self = setmetatable({}, SpriteRenderer)
   self.def = spriteDef
+  self.seed = seed
   self.image = getImage(spriteDef.image)
   local iw, ih = self.image:getDimensions()
   self.frames = {}
@@ -46,13 +88,26 @@ end
 function SpriteRenderer:draw(px, py, camX, camY, facing, walkPhase, stepFlip)
   local x = math.floor(px - camX)
   local y = math.floor(py - camY) - 4
+  local image = self.image
   -- full-color art claims its 16x16 cell out of the shade-remap pass
-  if self.def.trueColor then PaletteFX.markTrueColor(x, y, 16, 16) end
+  if self.def.trueColor then
+    PaletteFX.markTrueColor(x, y, 16, 16)
+  elseif PaletteFX.usesGbcPack() then
+    -- RED++: the world canvas is already true-color (TileRenderer bakes
+    -- terrain, this bakes the sprite) and the world pass runs unshaded
+    -- (OverworldState.sgbWorldZones), so this draws like any normal sprite
+    -- -- opaque character pixels over a real-alpha-transparent background,
+    -- no trueColor rect needed (there is no shader left to exempt it from).
+    local colors, group = PaletteFX.spriteObp(self.def, self.seed)
+    if colors then
+      image = getObpImage(self.def.image, colors, group)
+    end
+  end
   -- single-frame sprites (item balls, fossils...) have one fixed pose;
   -- still 3-frame sprites turn to face (the nurse at her machine,
   -- facePlayer on STAY NPCs) but never show walk frames
   if self.def.frames <= 1 then
-    love.graphics.draw(self.image, self.frames[0], x, y)
+    love.graphics.draw(image, self.frames[0], x, y)
     return
   end
   local frame = (self.def.walker and walkPhase == 1)
@@ -65,9 +120,9 @@ function SpriteRenderer:draw(px, py, camX, camY, facing, walkPhase, stepFlip)
   end
   local quad = self.frames[frame] or self.frames[0]
   if flip then
-    love.graphics.draw(self.image, quad, x + 16, y, 0, -1, 1)
+    love.graphics.draw(image, quad, x + 16, y, 0, -1, 1)
   else
-    love.graphics.draw(self.image, quad, x, y)
+    love.graphics.draw(image, quad, x, y)
   end
 end