Make freenect_flags an actual flag enum

Signed-off-by: Robert Xiao <brx@cs.cmu.edu>

include/libfreenect.h

@@ -113,8 +113,8 @@ typedef enum {
 	FREENECT_AUTO_WHITE_BALANCE = 1 << 1,
 	FREENECT_RAW_COLOR          = 1 << 4,
 	// registers to be written with 0 or 1
-	FREENECT_MIRROR_DEPTH       = 0x0017,
-	FREENECT_MIRROR_VIDEO       = 0x0047,
+	FREENECT_MIRROR_DEPTH       = 1 << 16,
+	FREENECT_MIRROR_VIDEO       = 1 << 17,
 } freenect_flag;
 
 /// Possible values for setting each `freenect_flag`

src/flags.c

@@ -32,12 +32,26 @@
 // freenect_set_flag is the only function exposed in libfreenect.h
 // The rest are available internally via #include flags.h
 
+static int register_for_flag(int flag) {
+    switch(flag) {
+    case FREENECT_MIRROR_DEPTH:
+        return 0x17;
+    case FREENECT_MIRROR_VIDEO:
+        return 0x47;
+    default:
+        return -1;
+    }
+}
 
 int freenect_set_flag(freenect_device *dev, freenect_flag flag, freenect_flag_value value)
 {
-	if (flag == FREENECT_MIRROR_DEPTH || flag == FREENECT_MIRROR_VIDEO)
-		return write_register(dev, flag, value);
-
+    if (flag >= (1<<16)) {
+        int reg = register_for_flag(flag);
+        if(reg < 0)
+            return -1;
+        return write_register(dev, reg, value);
+    }
+
 	uint16_t reg = read_cmos_register(dev, 0x0106);
 	if (reg < 0)
 		return reg;