git.hungrycats.org Git - xscreensaver/blob - hacks/glx/bubble3d.h

   1 /* GLBUBBLES (C) 1998 Richard W.M. Jones. */
   2
   3 #ifndef __bubbles3d_h__
   4 #define __bubbles3d_h__
   5
   6 #include <X11/Intrinsic.h>
   7
   8 #ifdef STANDALONE
   9 # include <math.h>
  10 # include "xlockmoreI.h"        /* from the xscreensaver distribution */
  11 #else /* !STANDALONE */
  12 # include "xlock.h"             /* from the xlockmore distribution */
  13 #endif /* !STANDALONE */
  14
  15 #include <GL/gl.h>
  16 #include <GL/glu.h>
  17
  18 /* Static configuration. */
  19 #define GLB_SLOW_GL          1  /* Set this if you have a slow GL
  20                                    * implementation. If you have an accelerated
  21                                    * graphics card, set this to 0.
  22                                  */
  23 #define GLB_USE_BLENDING     0  /* Use alpha feature to create see-through
  24                                    * bubbles.
  25                                  */
  26 #define GLB_VERTICES_EPSILON 0.0005     /* How close are identical vertices? */
  27
  28 /* Configuration structure. */
  29 struct glb_config {
  30         int         subdivision_depth;  /* Controls how many triangles are in
  31                                          * each bubble. 2 and 3 are good values.
  32                                          */
  33         int         nr_nudge_axes;      /* Number of directions in which each
  34                                          * bubble gets stretched. Values between
  35                                          * 3 and 7 seem to produce good results.
  36                                          */
  37         GLfloat     nudge_angle_factor;         /* Max. amount of rotation in nudge angles.
  38                                                  * Controls the amount of `wobble' we see,
  39                                                  * and 0.3 seems to work well.
  40                                                  */
  41         GLfloat     nudge_factor;       /* Max. displacement of any single nudge.
  42                                          * Controls the amount of the wobble. Depends
  43                                          * on NR_NUDGE_AXES, and must not exceed
  44                                          * 1 / NR_NUDGE_AXES. 0.1 is good.
  45                                          */
  46         GLfloat     rotation_factor;    /* Max. amount by which bubbles rotate. */
  47         int         create_bubbles_every;       /* How often to create new bubbles. */
  48         int         max_bubbles;        /* Max. number of bubbles to create. */
  49         double      p_bubble_group[4];  /* Probabilities of creating 1, 2, 3, 4
  50                                          * bubbles in a group. Cumulative.
  51                                          */
  52         GLfloat     max_size;   /* Max. size. */
  53         GLfloat     min_size;   /* Min. size of bubbles. */
  54         GLfloat     max_speed;  /* Max. speed. */
  55         GLfloat     min_speed;  /* Min. speed of bubbles. */
  56         GLfloat     scale_factor;       /* Factor by which bubbles scale from bottom
  57                                          * of screen to top. 1.5 - 2.0 are OK.
  58                                          */
  59         GLfloat     screen_bottom;      /* Bottom of screen. */
  60         GLfloat     screen_top; /* Top of screen. */
  61         GLfloat     bg_colour[4];       /* Background colour. */
  62         GLfloat     bubble_colour[4];   /* Colour of the bubbles. */
  63 };
  64
  65 extern struct glb_config glb_config;
  66
  67 #define glb_drand() ((double)LRAND() / (double)MAXRAND)
  68
  69 /*-- From glb_sphere.c. --*/
  70 typedef GLfloat glb_vertex[3];
  71 typedef GLuint glb_triangle[3];
  72 extern void glb_sphere_init(void);
  73 extern glb_vertex *glb_sphere_get_vertices(int *nr_vertices);
  74 extern glb_triangle *glb_sphere_get_triangles(int *nr_triangles);
  75 extern void glb_sphere_end(void);
  76
  77 /*-- From glb_bubble.c. --*/
  78 extern void *glb_bubble_new(GLfloat x, GLfloat y, GLfloat z, GLfloat scale,
  79                             GLfloat y_incr, GLfloat scale_incr);
  80 extern void glb_bubble_delete(void *);
  81 extern void glb_bubble_step(void *);
  82 extern void glb_bubble_draw(void *);
  83 extern GLfloat glb_bubble_get_y(void *);
  84
  85 /*-- From glb_draw.c. --*/
  86 extern void *glb_draw_init(void);
  87 extern void glb_draw_step(void *);
  88 extern void glb_draw_end(void *);
  89
  90 #endif /* __bubbles3d_h__ */