Fill in powerup related headers

Author: TheOnlyZac

include/jt.h

@@ -5,7 +5,18 @@
 #define JT_H
 
 #include "common.h"
+#include <step.h>
 
-// ...
+/**
+ * @brief Sly entity.
+ *
+ * JT = "jewel thief" = codename for Sly.
+ *
+ * @todo Implement struct.
+ */
+struct JT : public STEP
+{
+    // ...
+};
 
 #endif // JT_H

include/po.h

@@ -0,0 +1,22 @@
+/**
+ * @file po.h
+ *
+ * @brief TBD
+ */
+#ifndef PO_H
+#define PO_H
+
+#include "common.h"
+#include <so.h>
+
+/**
+ * @brief TBD
+ *
+ * @todo Implement struct.
+ */
+struct PO : public SO
+{
+    // ...
+};
+
+#endif // PO_H

include/so.h

@@ -6,9 +6,16 @@
 #ifndef SO_H
 #define SO_H
 
+#include <alo.h>
+
 /**
+ * @brief Scene object.
+ *
  * @todo Implement struct.
  */
-struct SO;
+struct SO : public ALO
+{
+    // ...
+};
 
 #endif // SO_H

include/step.h

@@ -5,7 +5,16 @@
 #define STEP_H
 
 #include "common.h"
+#include <po.h>
 
-// ...
+/**
+ * @brief TBD
+ *
+ * @todo Implement struct.
+ */
+struct STEP : public PO
+{
+    // ...
+};
 
 #endif // STEP_H

include/steppower.h

@@ -5,11 +5,35 @@
 #define STEPPOWER_H
 
 #include "common.h"
+#include <jt.h>
 #include <joy.h>
 
 /**
- * @brief Rotate the current powerup.
+ * @brief Selected powerup flags.
  */
-int IRotatePowerUp(JOY *pjoy,int iCur,int iMax,int *mpigrfvault);
+enum FSP
+{
+    FSP_Nil = -1,
+    FSP_Dive = 0,
+    FSP_SpeedUpClock = 1,
+    FSP_SlowDownClock = 2,
+    FSP_Ball = 3,
+    FSP_Max = 4
+};
+
+/**
+ * @brief Set the selected powerup.
+ */
+void SetFsp(FSP fsp);
+
+/**
+ * @brief Update the currently selected powerup.
+ */
+void UpdateJtActivePowerUp(JT *pjt, JOY *pjoy);
+
+/**
+ * @brief Rotate the selected powerup.
+ */
+int IRotatePowerUp(JOY *pjoy, int iCur, int iMax, int *mpigrfvault);
 
 #endif // STEPPOWER_H

src/P2/steppower.c

@@ -1,4 +1,4 @@
-#include "common.h"
+#include "steppower.h"
 
 INCLUDE_ASM(const s32, "P2/steppower", SetFsp__F3FSP);