262 lines
6.9 KiB
C
262 lines
6.9 KiB
C
/* -*- Mode: C; tab-width: 4 -*- */
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/* bubble3d.c - 3D bubbles */
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#if !defined( lint ) && !defined( SABER )
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static const char sccsid[] = "@(#)bubble3d.c 4.11 98/06/16 xlockmore";
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#endif
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/*-
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* BUBBLE3D (C) 1998 Richard W.M. Jones.
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* Permission to use, copy, modify, and distribute this software and its
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* documentation for any purpose and without fee is hereby granted,
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* provided that the above copyright notice appear in all copies and that
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* both that copyright notice and this permission notice appear in
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* supporting documentation.
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*
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* This file is provided AS IS with no warranties of any kind. The author
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* shall have no liability with respect to the infringement of copyrights,
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* trade secrets or any patents by this file or any part thereof. In no
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* event will the author be liable for any lost revenue or profits or
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* other special, indirect and consequential damages.
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*
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* Revision History:
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* 16-Jun-98: Written.
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*
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* bubble.c: This code is responsible for creating and managing
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* bubbles over their lifetime.
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* The bubbles may be drawn inside out.
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*/
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#include "bubble3d.h"
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typedef struct bubble {
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GLfloat *contributions; /* List of contributions from each
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* nudge to each vertex. This list has
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* length nr_vertices * nr_nudge_axes.
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*/
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GLfloat x, y, z; /* (x,y,z) location of the bubble. */
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GLfloat scale; /* Scaling factor applied to bubble. */
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GLfloat y_incr, scale_incr; /* Change in y and scale each frame. */
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GLfloat rotx, roty, rotz; /* Current rotation. */
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GLfloat rotx_incr, roty_incr, rotz_incr; /* Amount by which we increase
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* rotation each step.
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*/
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GLfloat *nudge_angle; /* Current angle (radians) of each
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* nudge. This list has length nr_nudge_axes.
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*/
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GLfloat *nudge_angle_incr; /* Amount by which we increase each nudge
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* angle in each frame.
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*/
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} bubble;
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/* Should be taken care of already... but just in case */
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#if !defined( __GNUC__ ) && !defined(__cplusplus) && !defined(c_plusplus)
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#undef inline
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#define inline /* */
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#endif
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static inline void
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normalize(GLfloat v[3])
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{
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GLfloat d = (GLfloat) sqrt((double) (v[0] * v[0] + v[1] * v[1] +
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v[2] * v[2]));
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if (d != 0) {
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v[0] /= d;
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v[1] /= d;
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v[2] /= d;
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} else {
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v[0] = v[1] = v[2] = 0;
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}
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}
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static inline GLfloat
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dotprod(GLfloat * v1, GLfloat * v2)
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{
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return v1[0] * v2[0] + v1[1] * v2[1] + v1[2] * v2[2];
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}
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static inline GLfloat
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max(GLfloat a, GLfloat b)
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{
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return a > b ? a : b;
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}
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/* Create a new bubble. */
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void *
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glb_bubble_new(GLfloat x, GLfloat y, GLfloat z, GLfloat scale,
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GLfloat y_incr, GLfloat scale_incr)
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{
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int i, j;
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/* GLfloat axes [glb_config.nr_nudge_axes][3]; */
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GLfloat axes[5][3]; /* HARD CODED for SunCC */
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int nr_vertices;
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glb_vertex *vertices = glb_sphere_get_vertices(&nr_vertices);
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bubble *b = (bubble *) malloc(sizeof *b);
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if (b == 0)
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return 0;
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b->contributions = (GLfloat *) malloc(sizeof (GLfloat) * nr_vertices *
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glb_config.nr_nudge_axes);
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if (b->contributions == 0) {
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free(b);
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return 0;
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}
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b->nudge_angle = (GLfloat *) malloc(sizeof (GLfloat) * glb_config.nr_nudge_axes);
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if (b->nudge_angle == 0) {
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free(b->contributions);
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free(b);
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return 0;
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}
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b->nudge_angle_incr = (GLfloat *) malloc(sizeof (GLfloat) * glb_config.nr_nudge_axes);
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if (b->nudge_angle_incr == 0) {
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free(b->nudge_angle);
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free(b->contributions);
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free(b);
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return 0;
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}
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/* Initialize primitive elements. */
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b->x = x;
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b->y = y;
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b->z = z;
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b->scale = scale;
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b->y_incr = y_incr;
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b->scale_incr = scale_incr;
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b->rotx = b->roty = b->rotz = 0;
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b->rotx_incr = glb_drand() * glb_config.rotation_factor * 2
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- glb_config.rotation_factor;
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b->roty_incr = glb_drand() * glb_config.rotation_factor * 2
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- glb_config.rotation_factor;
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b->rotz_incr = glb_drand() * glb_config.rotation_factor * 2
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- glb_config.rotation_factor;
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/* Initialize the nudge angle arrays. */
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for (i = 0; i < glb_config.nr_nudge_axes; ++i) {
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b->nudge_angle[i] = 0;
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b->nudge_angle_incr[i] = glb_drand() * glb_config.nudge_angle_factor;
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}
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/* Choose some random nudge axes. */
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for (i = 0; i < glb_config.nr_nudge_axes; ++i) {
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axes[i][0] = glb_drand() * 2 - 1;
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axes[i][1] = glb_drand() * 2 - 1;
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axes[i][2] = glb_drand() * 2 - 1;
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normalize(axes[i]);
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}
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/* Calculate the contribution that each nudge axis has on each vertex. */
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for (i = 0; i < nr_vertices; ++i)
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for (j = 0; j < glb_config.nr_nudge_axes; ++j)
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b->contributions[i * glb_config.nr_nudge_axes + j]
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= max(0.0, dotprod(vertices[i], axes[j]));
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return (void *) b;
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}
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/* Delete a bubble and free up all memory. */
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void
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glb_bubble_delete(void *bb)
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{
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bubble *b = (bubble *) bb;
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if (b != NULL) {
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if (b->nudge_angle_incr) {
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free(b->nudge_angle_incr);
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}
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if (b->nudge_angle) {
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free(b->nudge_angle);
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}
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if (b->contributions) {
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free(b->contributions);
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}
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free(b);
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b = (bubble *) NULL;
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}
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}
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/* Rotate and wobble a bubble by a single step. */
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void
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glb_bubble_step(void *bb)
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{
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int i;
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bubble *b = (bubble *) bb;
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/* Update the rotation. */
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b->rotx += b->rotx_incr;
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b->roty += b->roty_incr;
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b->rotz += b->rotz_incr;
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/* Update the nudge angles. */
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for (i = 0; i < glb_config.nr_nudge_axes; ++i)
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b->nudge_angle[i] += b->nudge_angle_incr[i];
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/* Move it upwards & outwards. */
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b->y += b->y_incr;
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b->scale += b->scale_incr;
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}
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/* Draw a bubble. */
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void
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glb_bubble_draw(void *bb)
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{
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int i, j;
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bubble *b = (bubble *) bb;
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int nr_vertices;
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glb_vertex *vertices = glb_sphere_get_vertices(&nr_vertices);
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int nr_triangles;
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glb_triangle *triangles = glb_sphere_get_triangles(&nr_triangles);
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glb_vertex *new_vertices;
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new_vertices = (glb_vertex *) malloc(sizeof (glb_vertex) * nr_vertices);
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/* Calculate the vertices of this bubble, factoring in each nudge axis. */
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for (i = 0; i < nr_vertices; ++i) {
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GLfloat s = 0;
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for (j = 0; j < glb_config.nr_nudge_axes; ++j)
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s += ((GLfloat) cos((double) (b->nudge_angle[j])) *
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glb_config.nudge_factor - glb_config.nudge_factor / 2) *
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b->contributions[i * glb_config.nr_nudge_axes + j];
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new_vertices[i][0] = vertices[i][0] * (s + 1);
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new_vertices[i][1] = vertices[i][1] * (s + 1);
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new_vertices[i][2] = vertices[i][2] * (s + 1);
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}
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glPushMatrix();
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/* Apply translation, rotation and scalings. */
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glTranslatef(b->x, b->y, b->z);
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glRotatef(b->rotx, 1, 0, 0);
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glRotatef(b->roty, 0, 1, 0);
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glRotatef(b->rotz, 0, 0, 1);
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glScalef(b->scale, b->scale, b->scale);
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/* Draw the bubble. */
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glBegin(GL_TRIANGLES);
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for (i = 0; i < nr_triangles; ++i) {
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glNormal3fv(new_vertices[triangles[i][0]]);
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glVertex3fv(new_vertices[triangles[i][0]]);
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glNormal3fv(new_vertices[triangles[i][1]]);
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glVertex3fv(new_vertices[triangles[i][1]]);
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glNormal3fv(new_vertices[triangles[i][2]]);
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glVertex3fv(new_vertices[triangles[i][2]]);
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}
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glEnd();
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glPopMatrix();
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free(new_vertices);
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}
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/* Return y value. */
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GLfloat
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glb_bubble_get_y(void *bb)
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{
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bubble *b = (bubble *) bb;
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return b->y;
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}
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