1 files changed, 20 insertions, 0 deletions
diff --git a/src/d/d_rvl_fb_copy.cpp b/src/d/d_rvl_fb_copy.cpp
new file mode 100644
index 0000000000..2948559dbe
--- /dev/null
+++ b/src/d/d_rvl_fb_copy.cpp
@@ -0,0 +1,20 @@
+#include "d/d_rvl_fb_copy.h"
+
+// This TU's existence is inferred from the following facts:
+//   - In most versions the below flag symbol is located in .sbss between symbols in d_cursor_mng
+//     and m_Do_main on most versions
+//   - The symbol is not used in either of those TUs
+//   - In DZDE01 an extra TU (d_E3Stage_select06) exists between those two TUs, and the flag symbol
+//     is located before its .sbss symbols meaning it cannot be in m_Do_main
+//   - In Wii versions there is a 7-byte gap between the last known symbol in d_cursor_mng and the
+//     flag symbol, which can only be caused by:
+//     a) An extra unused 4-byte-aligned symbol in d_cursor_mng (unlikely, the symbol map only
+//        tends to exclude 1-byte symbols)
+//     b) 4 extra unused 1-byte symbols in d_cursor_mng prior to the flag symbol (generally seems
+//        implausible to have that many extra unused vars)
+//     c) The symbol is contained by the demo-specific TU (seems implausible, doesn't really belong
+//        there and everything else would need to be guarded for other versions rather than just
+//        excluding the TU)
+//     d) An extra TU which forces the flag symbol to be aligned to 8 bytes (most likely reason)
+
+bool g_rvlEnableExtraFramebufferCopy;