--- imgui.h.orig	2026-05-12 14:53:37.000000000 -0600
+++ imgui.h	2026-06-15 00:00:00.000000000 -0600
@@ -2949,7 +2949,15 @@
 #define IM_COL32_G_SHIFT    8
 #define IM_COL32_B_SHIFT    0
 #define IM_COL32_A_SHIFT    24
 #define IM_COL32_A_MASK     0xFF000000
+#elif defined(__BIG_ENDIAN__) || defined(__POWERPC__) || defined(__powerpc__) || defined(__ppc__) || (defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__) && (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__))
+// OpenGL backends pass ImDrawVert::col and RGBA32 texture data to OpenGL as
+// byte arrays. Keep the in-memory byte order as RGBA on big-endian targets.
+#define IM_COL32_R_SHIFT    24
+#define IM_COL32_G_SHIFT    16
+#define IM_COL32_B_SHIFT    8
+#define IM_COL32_A_SHIFT    0
+#define IM_COL32_A_MASK     0x000000FF
 #else
 #define IM_COL32_R_SHIFT    0
 #define IM_COL32_G_SHIFT    8