Function: resolveSecondaryTiles()
resolveSecondaryTiles(
primaryLevel,primaryCol,primaryRow,secondaryLevel,secondaryZ):SecondaryTileResolution
Defined in: packages/deck.gl-raster/src/multi-raster-tileset/secondary-tile-resolver.ts:138
Resolve which secondary tiles cover a primary tile's extent, and compute the UV transform to map from primary UV space into the stitched secondary texture.
The UV transform [offsetX, offsetY, scaleX, scaleY] is intended for use
in a shader as sampledUV = uv * scale + offset, where uv is the
primary tile's local UV coordinate in [0,1]^2.
The Y axis follows a top-left convention: origin is at the top-left corner,
Y increases downward in texture/UV space. CRS coordinates may increase
upward (north), so offsetY is computed as
(stitchedMaxY - primaryMaxY) / stitchedCrsHeight to account for the flip.
Parameters
primaryLevel
The RasterTilesetLevel describing the primary tileset.
primaryCol
number
Column index of the primary tile.
primaryRow
number
Row index of the primary tile.
secondaryLevel
The RasterTilesetLevel describing the secondary tileset.
secondaryZ
number
The zoom level index of secondaryLevel within its
TilesetDescriptor.levels array. Stored in the returned
SecondaryTileResolution.z so the consumer knows which COG overview
to fetch.
Returns
A SecondaryTileResolution with tile indices, UV transform, stitched dimensions, and the min col/row of the covered range.