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1 #include <stdlib.h>
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2
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3 #ifndef __APPLE__
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4 #include <GL/glut.h>
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5 #else
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6 #include <GLUT/glut.h>
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7 #endif
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8
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9 #include "metasurf.h"
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10
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11 float eval(float x, float y, float z);
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12 void disp(void);
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13 void reshape(int x, int y);
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14 void keyb(unsigned char key, int x, int y);
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15
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16 struct metasurface *ms;
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17
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18 int main(int argc, char **argv)
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19 {
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20 float ldir[] = {-0.3, 0.3, 1, 0};
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21
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22 glutInitWindowSize(800, 600);
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23 glutInit(&argc, argv);
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24 glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
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25 glutCreateWindow("metasurf example: simple");
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26
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27 glutDisplayFunc(disp);
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28 glutReshapeFunc(reshape);
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29 glutKeyboardFunc(keyb);
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30
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31 glEnable(GL_DEPTH_TEST);
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32 glEnable(GL_CULL_FACE);
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33
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34 glEnable(GL_LIGHTING);
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35 glEnable(GL_LIGHT0);
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36 glLightfv(GL_LIGHT0, GL_POSITION, ldir);
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37
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38 glEnable(GL_NORMALIZE);
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39
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40 ms = msurf_create();
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41 /* consider anything below the threshold (0 by default) to be inside */
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42 msurf_inside(ms, MSURF_LESS);
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43 /* set the evaluation callback */
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44 msurf_eval_func(ms, eval);
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45 /* pass any vertices and normals generated directly to OpenGL */
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46 msurf_vertex_func(ms, glVertex3f);
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47 msurf_normal_func(ms, glNormal3f);
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48 /* slightly increase the bounds to avoid clipping the unit sphere */
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49 msurf_bounds(ms, -1.1, -1.1, -1.1, 1.1, 1.1, 1.1);
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50
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51 glutMainLoop();
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52 return 0;
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53 }
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54
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55 /* the unit sphere is implicitly defined as the locus of points in R3 satisfying
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56 * the equation: x^2 + y^2 + z^2 - 1 = 0
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57 */
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58 float eval(float x, float y, float z)
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59 {
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60 return (x * x + y * y + z * z) - 1.0;
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61 }
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62
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63 void disp(void)
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64 {
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65 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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66
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67 glMatrixMode(GL_MODELVIEW);
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68 glLoadIdentity();
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69 glTranslatef(0, 0, -3);
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70
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71 glBegin(GL_TRIANGLES);
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72 msurf_polygonize(ms);
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73 glEnd();
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74
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75 glutSwapBuffers();
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76 }
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77
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78 void reshape(int x, int y)
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79 {
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80 glMatrixMode(GL_PROJECTION);
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81 glLoadIdentity();
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82 gluPerspective(45.0, (float)x / (float)y, 0.5, 500.0);
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83 }
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84
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85 void keyb(unsigned char key, int x, int y)
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86 {
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87 switch(key) {
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88 case 27:
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89 exit(0);
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90
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91 case 'w':
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92 {
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93 static int wire;
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94 wire = !wire;
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95 glPolygonMode(GL_FRONT_AND_BACK, wire ? GL_LINE : GL_FILL);
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96 glutPostRedisplay();
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97 }
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98 break;
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99
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100 default:
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101 break;
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102 }
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103 }
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