1 files changed, 5 insertions, 2 deletions
diff --git a/sources/meta/exec.c b/sources/meta/exec.c
index 4f34d1b..663a2ae 100644
--- a/sources/meta/exec.c
+++ b/sources/meta/exec.c
@@ -237,7 +237,6 @@ BEGIN \
     if(c8->V[x] != c8->V[y]) c8->pc += 2; \
 END
 
-/* FIXME: correct wrapping, test */
 #define X_C8_DRW \
 BEGIN \
     u8 l; \
@@ -245,7 +244,11 @@ BEGIN \
     u8 cy = c8->V[y]; \
     \
     for(l = 0; l < n; l++) \
-        c8->DISPLAY[(cy + l) % 32] ^= ((u64)c8->RAM[c8->i + l]) << (64 - cx); \
+    { \
+        u64 pix = (u64)c8->RAM[c8->i + l]; \
+        pix = (pix << (64 - cx)) | (pix >> cx); \
+        c8->DISPLAY[(cy + l) % 32] ^= pix; \
+    } \
 END
 
 c8_decode_generate(exec)