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- /*
- * (c) Copyright 1993, 1994, 1995, 1996 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- * Unpublished-- rights reserved under the copyright laws of the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
-
- #include "Color.h"
- #include "Point.h"
-
- /* 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_b trans);
- void scale(float s);
- void scale_translate(float s, Point_b trans);
-
- /* Project all points into xy plane along normal or through projpt */
- void project();
- void project_borrow_points(Unitdisk src);
- void project(Point_b 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_b light, float I);
-
- /* Points the disk (meaning the normal at the center of the disk)
- * in direction d */
- void face_direction(Point_b d);
- void face_direction(Point_b 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_b light);
- void scale_colors_by_normals(Point_b light, Unitdisk src_normals);
- void scale_colors_by_points(Point_b 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_b *points, *normals;
- int points_size, normals_size;
- Color *colors;
- int colors_size;
- Point_b sphere;
- GLfloat angle;
- Point_b 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_b dlight, Point_b *what);
- int get_npoints();
- void copy_either(Point_b *dpt, Point_b *spt);
- void fill_either(Point_b *what);
- void fill_points_strip1();
- void fill_normals_strip1();
- void fill_either_strip1(Point_b *what);
- void fill_trig_tables();
- inline float /*Unitdisk::*/area_triangle(Point_b a, Point_b b, Point_b 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
-