/*	Public domain	*/

enum sg_billboard_mode {
	SG_BILLBOARD_RECT,			/* Opaque rectangle */
	SG_BILLBOARD_POLY			/* Complex polygon */
};

typedef struct sg_billboard {
	struct sg_node _inherit;
	enum sg_billboard_mode mode;		/* Billboarding method */
	Uint flags;
#define SG_BILLBOARD_PROJECT	0x01		/* Render facing the camera */
#define SG_BILLBOARD_NODUP	0x02		/* Surface is not a copy */
#define SG_BILLBOARD_NODUP_ANIM	0x04		/* Animation is not a copy */
#define SG_BILLBOARD_WIREFRAME	0x08		/* Overlay wireframe */
#define SG_BILLBOARD_HOLES	0x10		/* Enable hole detection */
#define SG_BILLBOARD_SAVESU	0x20		/* Store surface in save */
#define SG_BILLBOARD_SAVED	(SG_BILLBOARD_PROJECT|SG_BILLBOARD_WIREFRAME|\
				 SG_BILLBOARD_HOLES|SG_BILLBOARD_SAVESU)

	char path[AG_FILENAME_MAX];		/* Path for loading images
						   or animations */

	AG_Color color;				/* Background color */
	AG_Surface *su;				/* Source surface
						   (Anim: Effective surface) */
	AG_TexCoord *tc;			/* Effective texcoords */
	AG_Anim *an;				/* Source animation */
	AG_AnimState ast;			/* Playback instance */
	M_Real w, h;				/* Dimensions */
	void *to;				/* GLU tesselator object */
	SG_GLVertex3 **tessBufs;		/* Tesselator buffers */
	Uint          nTessBufs;
	float tolContour, tolHoles;		/* For simplification */
	M_Polygon contour;			/* Computed polygon contour */
	M_Polygon *holes;			/* Computed holes */
	Uint      nHoles;
	AG_TAILQ_HEAD_(sg_view_texture) vtex;	/* Per-view textures */
	AG_TAILQ_HEAD_(sg_view_list) vlist;	/* Per-view display lists */
} SG_Billboard;

#define SGBILLBOARD(n) ((SG_Billboard *)(n))

__BEGIN_DECLS
extern SG_NodeClass sgBillboardClass;

SG_Billboard *SG_BillboardNew(void *, const char *);
SG_Billboard *SG_BillboardFromSurface(void *, const char *, AG_Surface *);
SG_Billboard *SG_BillboardFromSurfaceNODUP(void *, const char *, AG_Surface *);
SG_Billboard *SG_BillboardFromAnim(void *, const char *, AG_Anim *);
SG_Billboard *SG_BillboardFromAnimNODUP(void *, const char *, AG_Anim *);
void          SG_BillboardFreeCached(void *);
void          SG_BillboardFreeSurfaces(void *);
int           SG_BillboardSetSurface(void *, AG_Surface *);
int           SG_BillboardSetSurfaceNODUP(void *, AG_Surface *);
int           SG_BillboardSetAnim(void *, AG_Anim *);
int           SG_BillboardSetAnimNODUP(void *, AG_Anim *);
void          SG_BillboardSetMode(void *, enum sg_billboard_mode);
void          SG_BillboardSetModeAuto(void *);
void          SG_BillboardSetProj(void *, int);
void          SG_BillboardAnimPlay(void *);
void          SG_BillboardAnimStop(void *);

/* Set the tolerance for polygon simplification. */
static __inline__ void
SG_BillboardSetTolContour(void *obj, float tol)
{
	SG_Billboard *bb = obj;

	AG_ObjectLock(bb);
	bb->tolContour = tol;
	AG_ObjectUnlock(bb);
}

/* Change the billboard size. */
static __inline__ void
SG_BillboardSetSize(void *obj, M_Real w, M_Real h)
{
	SG_Billboard *bb = obj;

	AG_ObjectLock(bb);
	bb->w = w;
	bb->h = h;
	AG_ObjectUnlock(bb);
}

/* Set the billboard background color. */
static __inline__ void
SG_BillboardSetColor(void *obj, AG_Color C)
{
	SG_Billboard *bb = obj;

	AG_ObjectLock(bb);
	bb->color = C;
	AG_ObjectUnlock(bb);
}
__END_DECLS