better menu screen

[gbajam22] / src / util.h

diff --git a/src/util.h b/src/util.h
index 6902d64..264367b 100644 (file)
--- a/src/util.h
+++ b/src/util.h
@@ -6,7 +6,9 @@
 #include "gba.h"
 
 #define RGB555(r, g, b)        \
-       (((r) >> 3) | (((g) << 2) & 0x3e0) | (((b) << 7) & 0x7c00))
+       ((((uint16_t)(r) >> 3) & 0x1f) | \
+        (((uint16_t)(g) << 2) & 0x3e0) | \
+        (((uint16_t)(b) << 7) & 0x7c00))
 
 #ifdef BUILD_GBA