cursor.h

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#ifndef ALCHEMY_CURSOR_H
#define ALCHEMY_CURSOR_H
 
/// @file
/// The cursor that approaches its target, shared by shops, name entry and
/// settings.
 
#include "types.h"
#include "static_assert.h"
#include "render_input.h"
 
/// Cursor that approaches its target, shared by shop, name entry and settings.
struct ShopCursor {
  struct RenderOutput *anchor; ///< the cursor's sprite, moved with its OAM
  u16 x;       ///< screen pixels: where the current move started
  u16 y;       ///< screen pixels: where the current move started
  s16 targetX; ///< screen pixels
  s16 targetY; ///< screen pixels
  s8 active;   ///< frames of the current move done; reset when it ends
  s8 kind;     ///< frames the move takes; 0 when the cursor is still
};
 
STATIC_ASSERT(sizeof(struct ShopCursor) == 0x10);
STATIC_ASSERT(offsetof(struct ShopCursor, targetX) == 0x08);
STATIC_ASSERT(offsetof(struct ShopCursor, active) == 0x0c);
 
/// A menu cursor: its render output, or the cursor that approaches its target.
// Screens that write only the image pointer use the union to retain store
// order.
union MenuCursor {
  struct RenderOutput *output; ///< the image alone; cursor.anchor
  struct ShopCursor cursor;
};
 
#endif