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diff --git a/Diagonal-stairs.md b/Diagonal-stairs.md index dd82266..c47e5df 100644 --- a/Diagonal-stairs.md +++ b/Diagonal-stairs.md @@ -5,3 +5,51 @@ All the stairs in Gen 1 and 2 only go upwards. Gen 3 had a few that go downwards [Here](https://github.com/Rangi42/pokecrystal/commit/756a1a712daf5dfd018313cb2f851e8d5e4e8f47) are all the changes needed to implement diagonal stairs, applied to a copy of pokecrystal. You can `clone` [Rangi42/pokecrystal](https://github.com/Rangi42/pokecrystal/tree/diagonal-stairs) and `checkout` the `diagonal-stairs` branch to test it for yourself.  + +## 1 Define the constants + +edit constants/collision_constants.asm +```diff +; collision data types (see data/tilesets/*_collision.asm) +; TileCollisionTable indexes (see data/collision_permissions.asm) + COLL_FLOOR EQU $00 +... + COLL_DOWN_WALL EQU $b3 ; unused ++COLL_DIAGONAL_STAIRS_RIGHT EQU $d0 ++COLL_DIAGONAL_STAIRS_LEFT EQU $d1 + COLL_FF EQU $ff ; garbage + +; collision data type nybbles + LO_NYBBLE_GRASS EQU $07 + HI_NYBBLE_TALL_GRASS EQU $10 +... + HI_NYBBLE_SIDE_WALLS EQU $b0 + HI_NYBBLE_UNUSED_C0 EQU $c0 ++HI_NYBBLE_DIAGONAL_STAIRS EQU $d0 +``` +edit constants/map_object_constants.asm +```diff +; StepTypesJumptable indexes (see engine/overworld/map_objects.asm) + const_def + const STEP_TYPE_00 ; 00 + const STEP_TYPE_SLEEP ; 01 +... + const STEP_TYPE_17 ; 17 + const STEP_TYPE_18 ; 18 + const STEP_TYPE_SKYFALL_TOP ; 19 ++ const STEP_TYPE_NPC_DIAGONAL_STAIRS ++ const STEP_TYPE_PLAYER_DIAGONAL_STAIRS + +... +; DoPlayerMovement.DoStep arguments (see engine/overworld/player_movement.asm) + const_def + const STEP_SLOW ; 0 + const STEP_WALK ; 1 + const STEP_BIKE ; 2 + const STEP_LEDGE ; 3 + const STEP_ICE ; 4 + const STEP_TURN ; 5 + const STEP_BACK_LEDGE ; 6 + const STEP_WALK_IN_PLACE ; 7 ++ const STEP_DIAGONAL_STAIRS +```
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