Trying to find dolphin texture bug

assets/scene/minesweeper.lua

@@ -20,10 +20,7 @@ camera = cameraCreate(CAMERA_PROJECTION_TYPE_ORTHOGRAPHIC)
 tilesetUi = tilesetGetByName("ui")
 textureUi = textureLoad(tilesetUi.texture)
 
-tilesetGrid = tilesetGetByName("grid")
-textureGrid = textureLoad(tilesetGrid.texture)
-gridPiece = tilesetPositionGetUV(tilesetGrid, 0, 0)
-gridSlice = tilesetPositionGetUV(tilesetGrid, 11, 3)
+textureGrid = textureLoad("minesweeper/grid_bg.dpi")
 
 tilesetCell = tilesetGetByName("cell")
 textureCell = textureLoad(tilesetCell.texture)
@@ -65,28 +62,21 @@ function cellDraw(x, y, type)
 end
 
 function backgroundDraw()
-  local t = (TIME.time * 3) % 1
-  local offXStart = gridPiece.u1 * t
-  local offYStart = gridPiece.v1 * t
-  local offXEnd = offXStart + gridPiece.u1
-  local offYEnd = offYStart + gridPiece.v1
-  
-  -- Tile background
-  local cols = math.ceil(screenGetWidth() / tilesetGrid.tileWidth)
-  local rows = math.ceil(screenGetHeight() / tilesetGrid.tileHeight)
+  local t = (TIME.time / 20) % 1
+  local scaleX = screenGetWidth() / textureGrid.width
+  local scaleY = screenGetHeight() / textureGrid.height
+  local u0 = t * scaleX
+  local v0 = t * scaleY
+  local u1 = scaleX + u0
+  local v1 = scaleY + v0
 
-  for y = 0, rows do
-    for x = 0, cols do
-      spriteBatchPush(
-        textureGrid,
-        x * tilesetGrid.tileWidth, y * tilesetGrid.tileHeight,
-        (x + 1) * tilesetGrid.tileWidth, (y + 1) * tilesetGrid.tileHeight,
-        colorWhite(),
-        gridSlice.u0 + offXStart, gridSlice.v0 + offYStart,
-        gridSlice.u1 + offXEnd, gridSlice.v1 + offYEnd
-      )
-    end
-  end
+  spriteBatchPush(textureGrid,
+    0, 0,
+    screenGetWidth(), screenGetHeight(),
+    colorWhite(),
+    u0, v0,
+    u1, v1
+  )
 end
 
 function sceneDispose()
@@ -112,6 +102,7 @@ function sceneRender()
         y * tilesetCell.tileHeight + offsetY,
         cells[i]
       )
+      break
     end
   end
   spriteBatchFlush()