git.y1.nz

commit 2d0a54c421f9cc187e81c51669c433db0ce7c237
parent a713142f7945b9512f7bd1db02badf4faa72dd57
Author: Toxa <untoxa@mail.ru>
Date:   Sat,  4 May 2024 19:41:24 +0300

GB: prevent VRAM corruption when loading tilemaps and submaps

Diffstat:
M
gbdk-lib/libc/targets/sm83/set_tile_submap.s
4
+++-
M
gbdk-lib/libc/targets/sm83/set_xy_t.s
4
+++-

2 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/gbdk-lib/libc/targets/sm83/set_tile_submap.s b/gbdk-lib/libc/targets/sm83/set_tile_submap.s
@@ -102,9 +102,11 @@ _set_bkg_submap::
         push    de              ; store wh
         push    bc              ; store dest
 3$:                             ; copy w tiles
-        WAIT_STAT
         ld      a, (__submap_tile_offset)
         add     (hl)
+        ld      e, a
+        WAIT_STAT
+        ld      a, e
         ld      (bc), a
         inc     hl
         
diff --git a/gbdk-lib/libc/targets/sm83/set_xy_t.s b/gbdk-lib/libc/targets/sm83/set_xy_t.s
@@ -54,9 +54,11 @@ __map_tile_offset::
 
 3$:                             ; Copy W tiles
 
-        WAIT_STAT
         LD      A, (__map_tile_offset)
         ADD     (HL)
+        LD      E, A
+        WAIT_STAT
+        LD      A, E
         LD      (BC), A
         INC     HL
         

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