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/* Copyright (c) 1992 The Geometry Center; University of Minnesota
1300 South Second Street; Minneapolis, MN 55454, USA;
This file is part of geomview/OOGL. geomview/OOGL is free software;
you can redistribute it and/or modify it only under the terms given in
the file COPYING, which you should have received along with this file.
This and other related software may be obtained via anonymous ftp from
geom.umn.edu; email: software@geom.umn.edu. */
/* Authors: Charlie Gunn, Stuart Levy, Tamara Munzner, Mark Phillips */
#ifndef _MG_PDEFS_
#define _MG_PDEFS_
/*
* Private, but machine-independent, declarations for mg library.
*/
#include "mg.h"
#define MGCONTEXTMAGIC OOGLMagic('m', 'c'<<8 | 1)
/*
* Appearance portion of state.
* We have a global stack of these which represent the user-specified values,
* with a stack push at every mgpushappearance().
*/
struct mgastk {
struct mgastk *next; /* stack link */
short changed;
short ap_seq, mat_seq, light_seq;
Appearance ap; /* Shallow copy of appearance -- don't delete */
Material mat; /* Ditto, Material */
LmLighting lighting;/* Ditto, Lighting */
int useshader; /* Flag: use shader function? (shader!=NULL
&& appearance requires shading */
mgshadefunc shader; /* Software shading function, or NULL if none */
void *shaderdata; /* Data which shader might use */
};
/*
* Transform stack, pushed by mgpushtransform().
*/
struct mgxstk {
struct mgxstk *next; /* stack link */
Transform T; /* Current object->world xform */
short xfm_seq;
short hasinv; /* Flag: Tinv is valid */
Transform Tinv;
};
struct mgcontext {
REFERENCEFIELDS
struct mgfuncs *devfuncs; /* Pointers to devices */
short devno; /* Device index -- MGD_GL, MGD_X11, ... */
short changed; /* flags: Must update device state because...*/
#define MC_WIN 0x01 /* window changed (reshaped, &c) */
#define MC_CAM 0x02 /* Camera changed */
#define MC_AP 0x04 /* Appearance changed */
#define MC_MAT 0x08 /* Material changed */
#define MC_LIGHT 0x10 /* Lighting changed */
#define MC_TRANS 0x20 /* Transformation changed */
#define MC_OPT 0x40 /* Options changed */
WnWindow *win; /* Window */
Camera *cam; /* Camera */
mgcontext *parent; /* Parent mg window, if any */
mgcontext *next; /* Link in list of all mg contexts */
struct mgastk *astk; /* Top of appearance stack */
struct mgxstk *xstk; /* Top of transform stack */
int shown; /* Is window 'visible'? */
ColorA background; /* Background color */
int opts; /* MG_SETOPTIONS flag mask */
Transform W2C; /* World->camera transform */
Transform C2W; /* Camera->world transform */
Transform T4; /* 4D->3D transform */
int T4_seq; /* sequence number for T4 */
float zfnudge; /* fraction of Z-range by which lines are
* nudged closer than surfaces.
*/
int space; /* space in which objects being drawn
* live; should be TM_EUCLIDEAN,
* TM_HYPERBOLIC, or TM_SPHERICAL
*/
Transform W2S, S2W; /* world-to-screen, screen-to-world xfms */
int has; /* Flag bits, set when cached values valid */
#define HAS_CPOS 0x1
#define HAS_S2O 0x2
#define HAS_POINT 0x4
/* Cached values, computed when needed: */
Point3 cpos; /* Location of camera in object coordinates */
Transform O2S, S2O; /* object-to-screen, screen-to-object xfms */
vvec point; /* outline for fat points */
void *NDinfo; /* Opaque pointer to caller-defined ND closure */
mgmapfunc NDmap; /* NDmap(NDinfo, HPtN *, HPt3 *, ColorA *) */
};
/*
* Pointer to the current mg context.
*/
extern struct mgcontext *_mgc;
/*
* List of all extant mg contexts.
*/
extern struct mgcontext *_mgclist;
/*
* Declarations of common mg routines, accessible to other mg packages
* (but not intended to be public):
*/
extern void mg_identity(void);
extern void mg_transform(Transform T);
extern void mg_settransform(Transform T);
extern void mg_gettransform(Transform T);
extern void mg_quads(int nquads, HPoint3 *v, Point3 *n, ColorA *c);
extern void mg_bezier(int du, int dv, int dimn, float *ctrlpts, float *txmapst,
ColorA *c);
extern void mg_findcam();
extern void mg_findS2O();
extern void mg_findO2S();
extern void mg_makepoint();
extern int mg_pushtransform(void), mg_poptransform(void);
extern int mg_pushappearance(void), mg_popappearance(void);
extern void mg_reshapeviewport(void);
extern Appearance *mg_getappearance(void);
extern Appearance *mg_setappearance(Appearance *ap, int mergeflag);
extern mgcontext *mg_newcontext(struct mgcontext *);
extern int mg_appearancebits( Appearance *ap, int merge, int *valid, int *flag );
#endif /*_MG_PDEFS_*/
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