metasurf
diff examples/simple/simple.c @ 4:2c575855f707
added simple example
author | John Tsiombikas <nuclear@member.fsf.org> |
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date | Tue, 25 Oct 2011 23:21:32 +0300 |
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1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000 1.2 +++ b/examples/simple/simple.c Tue Oct 25 23:21:32 2011 +0300 1.3 @@ -0,0 +1,103 @@ 1.4 +#include <stdlib.h> 1.5 + 1.6 +#ifndef __APPLE__ 1.7 +#include <GL/glut.h> 1.8 +#else 1.9 +#include <GLUT/glut.h> 1.10 +#endif 1.11 + 1.12 +#include "metasurf.h" 1.13 + 1.14 +float eval(float x, float y, float z); 1.15 +void disp(void); 1.16 +void reshape(int x, int y); 1.17 +void keyb(unsigned char key, int x, int y); 1.18 + 1.19 +struct metasurface *ms; 1.20 + 1.21 +int main(int argc, char **argv) 1.22 +{ 1.23 + float ldir[] = {-0.3, 0.3, 1, 0}; 1.24 + 1.25 + glutInitWindowSize(800, 600); 1.26 + glutInit(&argc, argv); 1.27 + glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH); 1.28 + glutCreateWindow("metasurf example: simple"); 1.29 + 1.30 + glutDisplayFunc(disp); 1.31 + glutReshapeFunc(reshape); 1.32 + glutKeyboardFunc(keyb); 1.33 + 1.34 + glEnable(GL_DEPTH_TEST); 1.35 + glEnable(GL_CULL_FACE); 1.36 + 1.37 + glEnable(GL_LIGHTING); 1.38 + glEnable(GL_LIGHT0); 1.39 + glLightfv(GL_LIGHT0, GL_POSITION, ldir); 1.40 + 1.41 + glEnable(GL_NORMALIZE); 1.42 + 1.43 + ms = msurf_create(); 1.44 + /* consider anything below the threshold (0 by default) to be inside */ 1.45 + msurf_inside(ms, MSURF_LESS); 1.46 + /* set the evaluation callback */ 1.47 + msurf_eval_func(ms, eval); 1.48 + /* pass any vertices and normals generated directly to OpenGL */ 1.49 + msurf_vertex_func(ms, glVertex3f); 1.50 + msurf_normal_func(ms, glNormal3f); 1.51 + /* slightly increase the bounds to avoid clipping the unit sphere */ 1.52 + msurf_bounds(ms, -1.1, -1.1, -1.1, 1.1, 1.1, 1.1); 1.53 + 1.54 + glutMainLoop(); 1.55 + return 0; 1.56 +} 1.57 + 1.58 +/* the unit sphere is implicitly defined as the locus of points in R3 satisfying 1.59 + * the equation: x^2 + y^2 + z^2 - 1 = 0 1.60 + */ 1.61 +float eval(float x, float y, float z) 1.62 +{ 1.63 + return (x * x + y * y + z * z) - 1.0; 1.64 +} 1.65 + 1.66 +void disp(void) 1.67 +{ 1.68 + glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); 1.69 + 1.70 + glMatrixMode(GL_MODELVIEW); 1.71 + glLoadIdentity(); 1.72 + glTranslatef(0, 0, -3); 1.73 + 1.74 + glBegin(GL_TRIANGLES); 1.75 + msurf_polygonize(ms); 1.76 + glEnd(); 1.77 + 1.78 + glutSwapBuffers(); 1.79 +} 1.80 + 1.81 +void reshape(int x, int y) 1.82 +{ 1.83 + glMatrixMode(GL_PROJECTION); 1.84 + glLoadIdentity(); 1.85 + gluPerspective(45.0, (float)x / (float)y, 0.5, 500.0); 1.86 +} 1.87 + 1.88 +void keyb(unsigned char key, int x, int y) 1.89 +{ 1.90 + switch(key) { 1.91 + case 27: 1.92 + exit(0); 1.93 + 1.94 + case 'w': 1.95 + { 1.96 + static int wire; 1.97 + wire = !wire; 1.98 + glPolygonMode(GL_FRONT_AND_BACK, wire ? GL_LINE : GL_FILL); 1.99 + glutPostRedisplay(); 1.100 + } 1.101 + break; 1.102 + 1.103 + default: 1.104 + break; 1.105 + } 1.106 +}