more various JSystem work (#2046)

* most of J3DAnmLoader done

* J3D / JKernel / JUTConsole work

* remove asm

* fix build

* dol 50%

include/dolphin/gd.h

@@ -4,4 +4,23 @@
 #include "dolphin/gd/GDBase.h"
 #include "dolphin/gd/GDGeometry.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+static inline u16 __GDLightID2Index(GXLightID id) {
+    u16 lightIdx = (31 - __cntlzw(id));
+    if (lightIdx > 7)
+        lightIdx = 0;
+    return lightIdx;
+}
+
+static inline u16 __GDLightID2Offset(GXLightID id) {
+    return __GDLightID2Index(id) * 0x10;
+}
+
+#ifdef __cplusplus
+};
+#endif
+
 #endif /* GD_H */