-TILE_SVGS=$(shell find $(patsubst %, $(VPATH)/%, $(TILE_DIRS)) -name "*.svg")
-TILE_PNGS=$(patsubst $(VPATH)/%.svg, %.png, $(TILE_SVGS))
+TILE_SVGS=$(shell find $(patsubst %, $(VPATH)/vector/%, $(TILE_DIRS)) -name "*.svg")
+TILE_PNGS=$(patsubst $(VPATH)/vector/%.svg, %.png, $(TILE_SVGS))
+
+# Bitmap tiles
+
+BTILE_DIRS=wall floor
+BTILE_SRC=$(shell find $(patsubst %, $(VPATH)/bitmap/%, $(BTILE_DIRS)) -name "*.png")
+BTILE_PNGS=$(patsubst $(VPATH)/bitmap/%, %, $(BTILE_SRC))
+
+# Vector images to rasterize without resizing