1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
|
/* GLBUBBLES (C) 1998 Richard W.M. Jones. */
#ifndef __bubbles3d_h__
#define __bubbles3d_h__
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif /* HAVE_CONFIG_H */
#ifdef STANDALONE
# include <math.h>
# include "xlockmoreI.h" /* from the xscreensaver distribution */
#else /* !STANDALONE */
# include "xlock.h" /* from the xlockmore distribution */
#endif /* !STANDALONE */
#if !defined(HAVE_JWXYZ) && !defined(HAVE_JWZGLES)
# include <GL/gl.h>
# include <GL/glu.h>
#endif
#ifdef HAVE_JWZGLES
# include "jwzgles.h"
#endif /* HAVE_JWZGLES */
/* Static configuration. */
#define GLB_SLOW_GL 0 /* Set this if you have a slow GL
* implementation. If you have an accelerated
* graphics card, set this to 0.
*/
#define GLB_VERTICES_EPSILON 0.0005 /* How close are identical vertices? */
/* Configuration structure. */
struct glb_config {
int transparent_p; /* Whether to use alpha blending */
int subdivision_depth; /* Controls how many triangles are in
* each bubble. 2 and 3 are good values.
*/
int nr_nudge_axes; /* Number of directions in which each
* bubble gets stretched. Values between
* 3 and 7 seem to produce good results.
*/
GLfloat nudge_angle_factor; /* Max. amount of rotation in nudge angles.
* Controls the amount of `wobble' we see,
* and 0.3 seems to work well.
*/
GLfloat nudge_factor; /* Max. displacement of any single nudge.
* Controls the amount of the wobble. Depends
* on NR_NUDGE_AXES, and must not exceed
* 1 / NR_NUDGE_AXES. 0.1 is good.
*/
GLfloat rotation_factor; /* Max. amount by which bubbles rotate. */
int create_bubbles_every; /* How often to create new bubbles. */
int max_bubbles; /* Max. number of bubbles to create. */
double p_bubble_group[4]; /* Probabilities of creating 1, 2, 3, 4
* bubbles in a group. Cumulative.
*/
GLfloat max_size; /* Max. size. */
GLfloat min_size; /* Min. size of bubbles. */
GLfloat max_speed; /* Max. speed. */
GLfloat min_speed; /* Min. speed of bubbles. */
GLfloat scale_factor; /* Factor by which bubbles scale from bottom
* of screen to top. 1.5 - 2.0 are OK.
*/
GLfloat screen_bottom; /* Bottom of screen. */
GLfloat screen_top; /* Top of screen. */
GLfloat bubble_colour[4]; /* Colour of the bubbles. */
int polygon_count;
};
extern struct glb_config glb_config;
#define glb_drand() ((double)LRAND() / (double)MAXRAND)
/*-- From glb_sphere.c. --*/
typedef struct glb_data glb_data;
typedef GLfloat glb_vertex[3];
typedef GLuint glb_triangle[3];
extern glb_data * glb_sphere_init(void);
extern glb_vertex *glb_sphere_get_vertices(glb_data *, int *nr_vertices);
extern glb_triangle *glb_sphere_get_triangles(glb_data *, int *nr_triangles);
extern void glb_sphere_end(glb_data *);
/*-- From glb_bubble.c. --*/
extern void *glb_bubble_new(glb_data *d,
GLfloat x, GLfloat y, GLfloat z, GLfloat scale,
GLfloat y_incr, GLfloat scale_incr);
extern void glb_bubble_delete(void *);
extern void glb_bubble_step(void *);
extern void glb_bubble_draw(glb_data *d, void *);
extern GLfloat glb_bubble_get_y(void *);
/*-- From glb_draw.c. --*/
extern void *glb_draw_init(void);
extern void glb_draw_step(void *);
extern void glb_draw_end(void *);
#endif /* __bubbles3d_h__ */
|
