For station ground sprite, OpenTTD always adds a railtype offset, unless a special trick is used to prevent it (like in example station before this PR).
With this PR, it is now always assumed the station ground sprite is a non-track one unless ground sprite is GROUNDSPRITE_RAIL_X or GROUNDSPRITE_RAIL_Y.
This hides the underlying GRF spec, and should simplify authors' life.
I think railtype offset might still be applied if ground sprite is from a spriteset, but it most likely depends on how the NML is written (sprite: spriteset; vs sprite: spriteset(offset)) and I didn't test, just guessing from the code.
For station ground sprite, OpenTTD always adds a railtype offset, unless a special trick is used to prevent it (like in example station before this PR).
With this PR, it is now always assumed the station ground sprite is a non-track one unless ground sprite is
GROUNDSPRITE_RAIL_XorGROUNDSPRITE_RAIL_Y.This hides the underlying GRF spec, and should simplify authors' life.
I think railtype offset might still be applied if ground sprite is from a spriteset, but it most likely depends on how the NML is written (
sprite: spriteset;vssprite: spriteset(offset)) and I didn't test, just guessing from the code.