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/*
* (c) Copyright 1993, Silicon Graphics, Inc. * ALL RIGHTS RESERVED * Permission to use, copy, modify, and distribute this software for * any purpose and without fee is hereby granted, provided that the above * copyright notice appear in all copies and that both the copyright notice * and this permission notice appear in supporting documentation, and that * the name of Silicon Graphics, Inc. not be used in advertising * or publicity pertaining to distribution of the software without specific, * written prior permission. * * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS" * AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE, * INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR * FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SILICON * GRAPHICS, INC. BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT, * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY * KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION, * LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF * THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC. HAS BEEN * ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON * ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE * POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE. * * US Government Users Restricted Rights * Use, duplication, or disclosure by the Government is subject to * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph * (c)(1)(ii) of the Rights in Technical Data and Computer Software * clause at DFARS 252.227-7013 and/or in similar or successor * clauses in the FAR or the DOD or NASA FAR Supplement. * Unpublished-- rights reserved under the copyright laws of the * United States. Contractor/manufacturer is Silicon Graphics, * Inc., 2011 N. Shoreline Blvd., Mountain View, CA 94039-7311. * * OpenGL(TM) is a trademark of Silicon Graphics, Inc. */#ifndef UNITDISK_H
#define UNITDISK_H
#define M_PI 3.141592654
#define M_2_PI 6.283185307
#include "color.hxx"
#include "scene.hxx"
/* Disks are sort of like spheres that have been flattened into
* the xy plane without changing the normals */
/* They are always made up of quadrilaterals */
class Unitdisk { public: Unitdisk(); ~Unitdisk();
inline Unitdisk operator=(Unitdisk a);
void draw(); void draw_by_perimeter(int pass_colors = 0, int pass_norms = 0, int pass_tex = 0);
void set_divisions(int new_rdivisions, int new_tdivisions); int get_rdivisions(); int get_tdivisions();
/* How big the section of the sphere is */ void set_angle(float new_angle); GLfloat get_angle();
/* This comes from the angle */ GLfloat get_radius();
/* Allocate points to hold the right number of things */ void alloc_points(); void alloc_normals(); void alloc_points_normals(); void free_points(); void free_normals(); void free_points_normals();
/* Fill the points / normals with the appropriate sin and cos values */ void fill_points(); void fill_normals(); void fill_points_normals();
/* These are mallocing */ void copy_points(Unitdisk src); void copy_normals(Unitdisk src); void copy_normals_from_points(Unitdisk src); void copy_normals_from_points();
/* These transform all the points */ void translate(Point trans); void scale(float s); void scale_translate(float s, Point trans);
/* Project all points into xy plane along normal or through projpt */ void project(); void project_borrow_points(Unitdisk src); void project(Point projpt);
/* Change all normals from their original direction (NOT their current
* direction) to refracted direction. Normals do not have to be computed * before calling this. However, the disk must still be in the xy plane * and the light must be on the z axis*/ void refract_normals(Point light, float I);
/* Points the disk (meaning the normal at the center of the disk)
* in direction d */ void face_direction(Point d); void face_direction(Point d, Unitdisk src);
/* Allocate colors */ void alloc_colors(); void free_colors();
void set_colors(Color c); void add_colors(Color c);
void map_normals_to_colors(); void map_z_to_colors(); void scale_colors_by_z(); void scale_alpha_by_z(); void scale_colors_by_normals(Point light); void scale_colors_by_normals(Point light, Unitdisk src_normals); void scale_colors_by_points(Point light, Unitdisk src_points); /* Computes how much the area of a section differs from the corresponding
* section in disk and scales the color by this amount.*/ void scale_colors_by_darea(Unitdisk disk);
private: int rdivisions, tdivisions; Point *points, *normals; int points_size, normals_size; Color *colors; int colors_size; Point sphere; GLfloat angle; Point zaxis; int still_in_xy;
float *sintable, *costable;
void draw_nocolors(); void draw_colors_normals(); void draw_colors_nonormals(); void scale_colors_by_either(Point dlight, Point *what); int get_npoints(); void copy_either(Point *dpt, Point *spt); void fill_either(Point *what); void fill_points_strip1(); void fill_normals_strip1(); void fill_either_strip1(Point *what); void fill_trig_tables(); inline float Unitdisk::area_triangle(Point a, Point b, Point c); inline float Unitdisk::area_triangle(GLfloat *a, GLfloat *b, GLfloat *c); inline float Unitdisk::area_2triangle(GLfloat *a, GLfloat *b, GLfloat *c);};
inline Unitdisk Unitdisk::operator=(Unitdisk a){ rdivisions = a.rdivisions; tdivisions = a.tdivisions; points = a.points; normals = a.normals; colors = a.colors; sphere = a.sphere; angle = a.angle; zaxis = a.zaxis; return *this;}
#endif
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