283 G2DLayer lyrBack;       // Background layer  variable
363     lyrBack.map            = map1;               // Map of tile indices  in InitLevel1()
364     lyrBack.nHS            = HSHIFT_LYR1;        // Horizontal Shift (Width of layer = 1<<nHS)  in InitLevel1()
365     lyrBack.nVS            = VSHIFT_LYR1;        // Vertical Shift (Height of layer = 1<<nVS)  in InitLevel1()
366     lyrBack.nBPI           = 1;                  // Bytes per Index (1,2)  in InitLevel1()
367 …lyrBack.nTileWidth     = TILE_WIDTH_LYR1;    // Width of tiles in pixels (should be >=16, power of…  in InitLevel1()
368 …lyrBack.nTileHeight    = TILE_HEIGHT_LYR1;   // Height of tiles in pixels (should be >=16, power o…  in InitLevel1()
369     lyrBack.bWrap          = TRUE;               // Whether layer wraps or not  in InitLevel1()
370     lyrBack.nNumMaterials  = NUM_MATERIALS_LYR1; // Number of materials  in InitLevel1()
371     lyrBack.tileDesc       = tileDescLyr1;       // Tile Descriptor Table  in InitLevel1()
372     lyrBack.matDesc        = matDescLyr1;        // Material Descriptor Table  in InitLevel1()