#ifndef __glsmapint_h__

#define __glsmapint_h__

/* Copyright (c) Mark J. Kilgard, 1998. */

/* This program is freely distributable without licensing fees 

   and is provided without guarantee or warrantee expressed or 

   implied. This program is -not- in the public domain. */

#include "glsmap.h"

enum { X = 0, Y = 1, Z = 2 };

#define INITFACE(mesh) \

    int steps = mesh->steps; \

    int sqsteps = mesh->steps * mesh->steps

#define FACE(side,y,x) \

    mesh->face[(side)*sqsteps + (y)*steps + (x)]

#define FACExy(side,i,j) \

    (&FACE(side,i,j).x)

#define FACEst(side,i,j) \

    (&FACE(side,i,j).s)

#define INITBACK(mesh) \

    int allrings = mesh->rings + mesh->edgeExtend; \

    int ringedspokes = allrings * mesh->steps

#define BACK(edge,ring,spoke) \

    mesh->back[(edge)*ringedspokes + (ring)*mesh->steps + (spoke)]

#define BACKxy(edge,ring,spoke) \

    (&BACK(edge,ring,spoke).x)

#define BACKst(edge,ring,spoke) \

    (&BACK(edge,ring,spoke).s)

typedef struct _STXY {

    GLfloat s, t;

    GLfloat x, y;

} STXY;

typedef struct _SphereMapMesh {

    int refcnt;

    int steps;

    int rings;

    int edgeExtend;

    STXY *face;

    STXY *back;

} SphereMapMesh;

struct _SphereMap {

    /* Shared sphere map mesh vertex data. */

    SphereMapMesh *mesh;

    /* Texture object ids. */

    GLuint smapTexObj;

    GLuint viewTexObjs[6];

    GLuint viewTexObj;

        /* Flags */

        SphereMapFlags flags;

    /* Texture dimensions must be a power of two. */

    int viewTexDim;  /* view texture dimension */

    int smapTexDim;  /* sphere map texture dimension */

    /* Viewport origins for view and sphere map rendering. */

    int viewOrigin[2];

    int smapOrigin[2];

    /* Viewing vectors. */

    GLfloat eye[3];

    GLfloat up[3];

    GLfloat obj[3];

    /* Projection parameters. */

    GLfloat viewNear;

    GLfloat viewFar;

    /* Rendering callbacks. */

    void (*positionLights)(int view, void *context);

    void (*drawView)(int view, void *context);

    /* Application specified callback data. */

    void *context;

};

/* Library internal routines. */

extern void __smapDrawSphereMapMeshSide(SphereMapMesh *mesh, int side);

extern void __smapDrawSphereMapMeshBack(SphereMapMesh *mesh);

extern void __smapValidateSphereMapMesh(SphereMapMesh *mesh);

#endif /* __glsmapint_h__ */