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/**
** sipp - SImple Polygon Processor
**
** A general 3d graphic package
**
** Copyright Equivalent Software HB 1992
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 1, or any later version.
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
** You can receive a copy of the GNU General Public License from the
** Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
**/
/**
** sipp.h - Public inteface to the sipp rendering library.
**/
#ifndef _SIPP_H
#define _SIPP_H
/*
* Definitions that allow this header file to be used either with or
* without ANSI C features like function prototypes.
*/
#undef _ANSI_ARGS_
#undef CONST
#if ((defined(__STDC__) || defined(SABER)) && !defined(NO_PROTOTYPE)) || defined(__cplusplus)
# define _USING_PROTOTYPES_ 1
# define _ANSI_ARGS_(x) x
# define CONST const
# ifdef __cplusplus
# define VARARGS (...)
# else
# define VARARGS ()
# endif
#else
# define _ANSI_ARGS_(x) ()
# define CONST
#endif
#undef EXTERN
#ifdef __cplusplus
# define EXTERN extern "C"
#else
# define EXTERN extern
#endif
#include <stdio.h>
#include <geometric.h>
/*
* Enable experimantal ffd code.
*/
#define FFD 1
#ifndef M_PI
#define M_PI 3.1415926535897932384626
#endif
typedef int bool;
#ifndef FALSE
#define FALSE 0
#define TRUE 1
#endif
/*
* Customize for those that don't have memcpy() and friends, but
* have bcopy() instead.
*/
#ifdef NOMEMCPY
#define memcpy(to, from, n) bcopy((from), (to), (n))
#endif
/*
* The macro RANDOM() should return a random number
* in the range [-1, 1].
*/
extern double drand48();
#define RANDOM() (2.0 * drand48() - 1.0)
/*
* Modes for rendering
*/
#define PHONG 0
#define GOURAUD 1
#define FLAT 2
#define LINE 3
/*
* Direction for rendering
*/
#define TOP_TO_BOTTOM FALSE
#define BOTTOM_TO_TOP TRUE
/*
* Field definition.
*/
#define EVEN 0
#define ODD 1
#define BOTH 2
/*
* Types of lightsources.
*/
#define LIGHT_DIRECTION 0
#define LIGHT_POINT 1
/*
* Types of spotlights (actually lightsource types too).
*/
#define SPOT_SHARP 2
#define SPOT_SOFT 3
/*
* Interface to shader functions. Can't have ANSI prototype due to different
* types being passed in.
*/
typedef void Shader();
/*
* FFD function interface.
*/
#ifdef FFD
typedef void FFD_func _ANSI_ARGS_((void *ffd_data,
Vector *pos,
Vector *texture,
Vector *ffd_pos,
Vector *ffd_texture));
#endif
/*
* Update function interface.
*/
typedef void Update_func _ANSI_ARGS_((void *client_data));
/*
* Colors are handled as an rgb-triple
* with values between 0 and 1.
*/
typedef struct {
double red;
double grn;
double blu;
} Color;
/*
* Virtual camera definition
*/
typedef struct {
Vector position; /* camera position */
Vector lookat; /* point to look at */
Vector up; /* Up direction in the view */
double focal_ratio;
} Camera;
/*
* Surface description used by the basic shader. This shader
* does simple shading of surfaces of a single color.
*/
typedef struct {
double ambient; /* Fraction of color visible in ambient light */
double specular; /* Fraction of colour specularly reflected */
double c3; /* "Shinyness" 0 = shiny, 1 = dull */
Color color; /* Colour of the surface */
Color opacity; /* Opacity of the surface */
} Surf_desc;
#ifdef FFD
/*
* Structure for temporary vertex data after ffd.
*/
typedef struct {
Vector pos;
Vector texture;
} FFD_Vertex;
#endif
/*
* Structure storing the vertices in surfaces. The vertices for a
* surface are stored in a binary tree sorted first on x, then y and last z.
*/
typedef struct vertex_t {
Vector pos; /* vertex position */
Vector normal; /* average normal at vertex */
Vector texture; /* texture parameters (if any) */
bool fixed_normal; /* Normal is fixed (supplied by user) */
#ifdef FFD
FFD_Vertex *ffd_vertex;
#endif
struct vertex_t *big, *sml; /* pointers to children in the tree */
} Vertex;
/*
* Polygon definition. A polygon is defined by a list of
* references to its vertices (counterclockwize order).
*/
typedef struct polygon_t {
int nvertices;
Vertex **vertex;
bool backface; /* polygon is backfacing (used at rendering) */
struct polygon_t *next;
} Polygon;
/*
* Optional header for a surface descriptor associated with a shader. This
* header is supplied for dynamically allocated descriptors that are to
* be released when no longer in use by any surfaces. When the reference
* count goes to zero, the free_func stored in the header is called with a
* pointer to the header stored. The surface descriptor must immediately
* follow it. When the surface is defined, a global flag set by
* sipp_surface_desc_headers is check so see if the header is before the
* descriptor.
*/
typedef struct {
int ref_count; /* # of references surface description */
void (*free_func) (); /* function to call when no more refs */
void *client_data; /* arbitrary data for free_func to use */
} Surf_desc_hdr;
/*
* Macro to allocate any structure with the above header.
*/
#define SIPP_SURF_HDR_ALLOC(type) ((Surf_desc_hdr *) \
smalloc(sizeof(Surf_desc_hdr) \
+ sizeof(type)))
/*
* Macro to extract a pointer of any type to the data after
* a surface description header.
*/
#define SIPP_SURFP_HDR(type, hdr) ((type *)(((char *)hdr) \
+ sizeof(Surf_desc_hdr)))
/*
* Surface definition. Each surface consists of a vertex tree,
* a polygon list, possibly a surface description header, a pointer to a
* surface description and a pointer to a shader function.
*/
typedef struct surface_t {
Vertex *vertices; /* vertex tree */
Polygon *polygons; /* polygon list */
Surf_desc_hdr *surf_desc_hdr; /* header for surface if not NULL */
void *surface; /* surface description */
Shader *shader; /* shader function */
/* Vector max, min; / * Bounding box (Future use) */
#ifdef FFD
Surf_desc_hdr *ffd_desc_hdr; /* header for ffd_data if not NULL */
void *ffd_data;
FFD_func *ffd_func;
#endif
int ref_count; /* # of references to this surface */
} Surface;
/*
* Object definition. Object consists of one or more
* surfaces and/or one or more subojects. Each object
* has its own transformation matrix that affects itself
* and all its subobjects.
*/
typedef struct object_t {
Surface **surfaces; /* Table of surfaces */
int num_surfaces; /* Number of surfaces */
int surfaces_size; /* Size of surfaces table */
struct object_t **sub_objs; /* Table of subobjects */
int num_sub_objs; /* Number of subobjects */
int sub_objs_size; /* Size of subobjects table */
Transf_mat transf; /* Transformation matrix */
int ref_count; /* # of references to this object */
} Object;
/*
* Information needed in a lightsource to generate
* shadows.
*/
typedef struct {
Transf_mat matrix;
double fov_factor;
double bias;
bool active;
float *d_map;
} Shadow_info;
/*
* Public part of lightsource definition.
* Used for both normal lightsources and spotlights.
*/
typedef struct lightsource_t {
Color color; /* Color of the lightsource */
bool active; /* Is the light on? */
int type; /* Type of lightsource */
void *info; /* Type dependent info */
Shadow_info shadow; /* Shadow information */
struct lightsource_t *next; /* next lightsource in the list */
} Lightsource;
extern char * SIPP_VERSION;
/*
* The world that is rendered. Defined in objects.c
*/
extern Object *sipp_world;
/*
* The internal (default) camera.
*/
extern Camera *sipp_camera;
/*
* This defines all public functions implemented in sipp.
*/
/* Global initialization and configuration functions. */
EXTERN void
sipp_init _ANSI_ARGS_((void));
EXTERN void
sipp_show_backfaces _ANSI_ARGS_((bool flag_));
EXTERN void
sipp_render_direction _ANSI_ARGS_((bool direction));
EXTERN void
sipp_background _ANSI_ARGS_((double red,
double grn,
double blu));
EXTERN void
sipp_set_update_callback _ANSI_ARGS_((Update_func *func,
void *client_data,
int period));
EXTERN void
sipp_shadows _ANSI_ARGS_((bool flag,
int size));
EXTERN bool
sipp_user_refcount _ANSI_ARGS_((bool flag));
EXTERN bool
sipp_surface_desc_headers _ANSI_ARGS_((bool flag));
#ifdef FFD
EXTERN bool
sipp_ffd_desc_headers _ANSI_ARGS_((bool flag));
#endif
/* Functions for handling surfaces and objects. */
EXTERN void
vertex_push _ANSI_ARGS_((double x,
double y,
double z));
EXTERN void
vertex_tx_push _ANSI_ARGS_((double x,
double y,
double z,
double u,
double v,
double w));
EXTERN void
vertex_n_push _ANSI_ARGS_((double x,
double y,
double z,
double nx,
double ny,
double nz));
EXTERN void
vertex_tx_n_push _ANSI_ARGS_((double x,
double y,
double z,
double u,
double v,
double w,
double nx,
double ny,
double nz));
EXTERN void
polygon_push _ANSI_ARGS_((void));
EXTERN Surface
*surface_create _ANSI_ARGS_((void *surf_desc,
Shader *shader));
EXTERN void
surface_unref _ANSI_ARGS_((Surface *surface));
EXTERN void
surface_desc_unref _ANSI_ARGS_((Surf_desc_hdr *surf_desc_hdr));
EXTERN Surface *
surface_basic_create _ANSI_ARGS_((double ambient,
double red,
double grn,
double blu,
double specular,
double c3,
double opred,
double opgrn,
double opblu));
EXTERN void
surface_set_shader _ANSI_ARGS_((Surface *surface,
void *surf_desc,
Shader *shader));
#ifdef FFD
EXTERN void
surface_set_ffd _ANSI_ARGS_((Surface *surface,
FFD_func *ffd_func,
void *ffd_data));
#endif
EXTERN void
surface_basic_shader _ANSI_ARGS_((Surface *surface,
double ambient,
double red,
double grn,
double blu,
double specular,
double c3,
double opred,
double opgrn,
double opblu));
EXTERN Object *
object_create _ANSI_ARGS_((void));
EXTERN Object *
object_instance _ANSI_ARGS_((Object *object));
EXTERN Object *
object_dup _ANSI_ARGS_((Object *object));
EXTERN Object *
object_deep_dup _ANSI_ARGS_((Object *object));
EXTERN void
object_unref _ANSI_ARGS_((Object *object));
EXTERN void
object_add_surface _ANSI_ARGS_((Object *object,
Surface *surface));
EXTERN bool
object_sub_surface _ANSI_ARGS_((Object *object,
Surface *surface));
EXTERN void
object_add_subobj _ANSI_ARGS_((Object *object,
Object *subobj));
EXTERN bool
object_sub_subobj _ANSI_ARGS_((Object *object,
Object *subobj));
/* Functions for handling transforming objects. */
EXTERN void
object_set_transf _ANSI_ARGS_((Object *obj,
Transf_mat *matrix));
EXTERN Transf_mat *
object_get_transf _ANSI_ARGS_((Object *obj,
Transf_mat *matrix));
EXTERN void
object_clear_transf _ANSI_ARGS_((Object *obj));
EXTERN void
object_transform _ANSI_ARGS_((Object *obj,
Transf_mat *matrix));
EXTERN void
object_rot_x _ANSI_ARGS_((Object *obj,
double ang));
EXTERN void
object_rot_y _ANSI_ARGS_((Object *obj,
double ang));
EXTERN void
object_rot_z _ANSI_ARGS_((Object *obj,
double ang));
EXTERN void
object_rot _ANSI_ARGS_((Object *obj,
Vector *point,
Vector *vec,
double ang));
EXTERN void
object_scale _ANSI_ARGS_((Object *obj,
double xscale,
double yscale,
double zscale));
EXTERN void
object_move _ANSI_ARGS_((Object *obj,
double dx,
double dy,
double dz));
/* Functions for handling lightsources and spotlights. */
EXTERN Lightsource *
lightsource_create _ANSI_ARGS_((double x,
double y,
double z,
double red,
double grn,
double blu,
int type));
EXTERN Lightsource *
spotlight_create _ANSI_ARGS_((double x,
double y,
double z,
double to_x,
double to_y,
double to_z,
double fov,
double red,
double grn,
double blu,
int type,
bool shadows));
EXTERN void
light_destruct _ANSI_ARGS_((Lightsource *light));
EXTERN void
lightsource_put _ANSI_ARGS_((Lightsource *lp,
double x,
double y,
double z));
EXTERN void
spotlight_pos _ANSI_ARGS_((Lightsource *lp,
double x,
double y,
double z));
EXTERN void
spotlight_at _ANSI_ARGS_((Lightsource *lp,
double x,
double y,
double z));
EXTERN void
spotlight_opening _ANSI_ARGS_((Lightsource *lp,
double fov));
EXTERN void
spotlight_shadows _ANSI_ARGS_((Lightsource *lp,
bool flag));
EXTERN void
light_color _ANSI_ARGS_((Lightsource *lp,
double red,
double grn,
double blu));
EXTERN void
light_active _ANSI_ARGS_((Lightsource *lp,
bool flag));
EXTERN double
light_eval _ANSI_ARGS_((Lightsource *lp,
Vector *pos,
Vector *vec));
/* Functions for handling the viewpoint and virtual cameras. */
EXTERN Camera *
camera_create _ANSI_ARGS_((void));
EXTERN void
camera_destruct _ANSI_ARGS_((Camera *cp));
EXTERN void
camera_position _ANSI_ARGS_((Camera *cp,
double x,
double y,
double z));
EXTERN void
camera_look_at _ANSI_ARGS_((Camera *cp,
double x,
double y,
double z));
EXTERN void
camera_up _ANSI_ARGS_((Camera *cp,
double x,
double y,
double z));
EXTERN void
camera_focal _ANSI_ARGS_((Camera *cp,
double focal));
EXTERN void
camera_params _ANSI_ARGS_((Camera *cp,
double x0,
double y0,
double z0,
double x,
double y,
double z,
double ux,
double uy,
double uz,
double ratio));
EXTERN void
camera_use _ANSI_ARGS_((Camera *cp));
/* Functions to render an image. */
EXTERN void
render_image_file _ANSI_ARGS_((int xres,
int yres,
FILE *im_file,
int render_mode,
int oversampling));
EXTERN void
render_image_func _ANSI_ARGS_((int xres,
int yres,
void (*pixel_func)(),
void *data,
int render_mode,
int oversampling));
EXTERN void
render_field_file _ANSI_ARGS_((int xres,
int yres,
FILE *im_file,
int render_mode,
int oversampling,
int field));
EXTERN void
render_field_func _ANSI_ARGS_((int xres,
int yres,
void (*pixel_func)(),
void *data,
int render_mode,
int oversampling,
int field));
EXTERN void
sipp_render_terminate _ANSI_ARGS_((void));
EXTERN void
shadowmaps_create _ANSI_ARGS_((int size));
EXTERN void
shadowmaps_destruct _ANSI_ARGS_((void));
/* The basic shader. */
EXTERN void
basic_shader _ANSI_ARGS_((Vector *pos,
Vector *normal,
Vector *texture,
Vector *view_vec,
Lightsource *lights,
Surf_desc *sd,
Color *color,
Color *opacity));
/*
* The following functions & macros are provided for backward compatibility.
* We plan to remove them from future releases though,
* so we don't encourage use of them.
*/
EXTERN void
object_delete _ANSI_ARGS_((Object *o));
#define object_install(obj) object_add_subobj(sipp_world, obj);
#define object_uninstall(obj) object_sub_subobj(sipp_world, obj);
#define view_from(x, y, z) camera_position(sipp_camera, x, y, z)
#define view_at(x, y, z) camera_look_at(sipp_camera, x, y, z)
#define view_up(x, y, z) camera_up(sipp_camera, x, y, z)
#define view_focal(fr) camera_focal(sipp_camera, fr)
#define viewpoint(x, y, z, x2, y2, z2, ux, uy, uz, fr)\
camera_params(sipp_camera, x, y, z, x2, y2, z2, ux, uy, uz, fr)
#define lightsource_push(x, y, z, i) \
lightsource_create(x, y, z, i, i, i, LIGHT_DIRECTION)
#define render_image_pixmap(w, h, p, f, m, o) \
render_image_func(w, h, f, p, m, o)
#endif /* _SIPP_H */
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