wip: map tile flag lookup

diff --git a/src/collision.s b/src/collision.s
index d1bca5e2a202ef289ec6a662e9d3e39bf57811e1..2b9e5d709e798f5316d5bb15cc3f552c39e93ab9 100644 (file)
--- a/src/collision.s
+++ b/src/collision.s
@@ -75,9 +75,19 @@ collision_tile:
   sra e ; / 4
   sra e ; / 8
   sra e ; / 16
+  ld a, e ; a = x pos
+
+  ld e, d
+  ld d, 0 ; de = y position now
 
   ; -> now convert position to 
   ; map flag index using a simple lut
   ; for y position + x
+  ld hl, collision_tile_lut
+  add hl, de ; hl + y offset 
+  ; hl = row ptr
+  ld e, a ; e = x pos
+  ld a, [hl] ; a = map flags row offset 
+  add a, e ; row + x = position of tile in map 
 
   ret