/*************************************************************************/
/* Types.h
/*************************************************************************/
#ifndef GRAPH_STATE_H
#define GRAPH_STATE_H

#include "types.h"
#include "stack.h"

#define PI								3.1415926535897932384626433832795
#define	NUM_COORD_SYSTEMS				6

typedef struct _sdisplay_t
{
	char *name;
	RtToken type;
	RtToken mode;

} display_t;

typedef struct _sprojection_t
{
	RtToken type;
	RtFloat fov;
	uint32_t flags;

} projection_t;

typedef struct _sformat_t
{
	RtInt xres;
	RtInt yres;
	RtFloat ar_f;
	RtFloat ar_p;

} format_t;

typedef struct _sopt_t
{
	display_t display;
	projection_t projection;
	format_t format;
	RtFloat crop[4];
	RtFloat screen[4];
	RtFloat clipping[2];

} opt_t;

typedef struct _sattr_t
{
	RtColor cs;
	RtFloat shadingrate;
	RtPointer ubasis, vbasis;
	RtInt ustep, vstep;
	RtInt nsides;

} attr_t;

typedef struct _sxform_t
{
	RtMatrix space[NUM_COORD_SYSTEMS];

} xform_t;

typedef struct _sgraph_state_t
{
	uint32_t frame;
	uint32_t context;
	uint32_t curr_xform;
	opt_t *pOpt;
	attr_t *pAttr;
	xform_t *pXform;
	stack_t *pOpt_stack;
	stack_t *pAttr_stack;
	stack_t *pXform_stack;
	RtMatrix *pXform_curr;

} graph_state_t;

enum eSpaces
{
	object_space = 0, world_space, camera_space, screen_space, raster_space, ndc_space
};

void GS_init(graph_state_t *pObj);
void GS_free(graph_state_t *pObj);
void GS_opt_push(graph_state_t *pObj);
void GS_opt_pop(graph_state_t *pObj);
void GS_attr_push(graph_state_t *pObj);
void GS_attr_pop(graph_state_t *pObj);
void GS_xform_push(graph_state_t *pObj);
void GS_xform_pop(graph_state_t *pObj);
void GS_xform_set(graph_state_t *pObj, uint32_t id);

#endif // GRAPH_STATE_H