1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/examples/simple/simple.c	Sat Sep 24 20:44:42 2011 +0300
     1.3 @@ -0,0 +1,133 @@
     1.4 +#include <stdio.h>
     1.5 +#include <stdlib.h>
     1.6 +
     1.7 +#ifndef __APPLE__
     1.8 +#include <GL/glut.h>
     1.9 +#else
    1.10 +#include <GLUT/glut.h>
    1.11 +#endif
    1.12 +
    1.13 +#include <vmath.h>
    1.14 +#include "psys.h"
    1.15 +
    1.16 +void disp(void);
    1.17 +void idle(void);
    1.18 +void reshape(int x, int y);
    1.19 +void keyb(unsigned char key, int x, int y);
    1.20 +void mouse(int bn, int state, int x, int y);
    1.21 +void motion(int x, int y);
    1.22 +vec3_t get_mouse_hit(float x, float y);
    1.23 +
    1.24 +struct psys_emitter *ps;
    1.25 +
    1.26 +int main(int argc, char **argv)
    1.27 +{
    1.28 +	glutInitWindowSize(800, 600);
    1.29 +	glutInit(&argc, argv);
    1.30 +	glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
    1.31 +	glutCreateWindow("libpsys example: simple");
    1.32 +
    1.33 +	glutDisplayFunc(disp);
    1.34 +	glutReshapeFunc(reshape);
    1.35 +	glutKeyboardFunc(keyb);
    1.36 +	glutMouseFunc(mouse);
    1.37 +	glutMotionFunc(motion);
    1.38 +	glutIdleFunc(idle);
    1.39 +
    1.40 +	glEnable(GL_CULL_FACE);
    1.41 +
    1.42 +	if(!(ps = psys_create())) {
    1.43 +		return 1;
    1.44 +	}
    1.45 +	psys_set_grav(ps, v3_cons(0, -1, 0), 0);
    1.46 +	psys_set_life(ps, 2, 0);
    1.47 +
    1.48 +	glutMainLoop();
    1.49 +	return 0;
    1.50 +}
    1.51 +
    1.52 +void disp(void)
    1.53 +{
    1.54 +	static unsigned int prev_msec;
    1.55 +	unsigned int msec = glutGet(GLUT_ELAPSED_TIME);
    1.56 +
    1.57 +	glMatrixMode(GL_MODELVIEW);
    1.58 +	glLoadIdentity();
    1.59 +	glTranslatef(0, 0, -10);
    1.60 +
    1.61 +	glClear(GL_COLOR_BUFFER_BIT);
    1.62 +
    1.63 +	psys_update(ps, (msec - prev_msec) / 1000.0);
    1.64 +	psys_draw(ps);
    1.65 +
    1.66 +	glutSwapBuffers();
    1.67 +}
    1.68 +
    1.69 +void idle(void)
    1.70 +{
    1.71 +	glutPostRedisplay();
    1.72 +}
    1.73 +
    1.74 +void reshape(int x, int y)
    1.75 +{
    1.76 +	glViewport(0, 0, x, y);
    1.77 +
    1.78 +	glMatrixMode(GL_PROJECTION);
    1.79 +	glLoadIdentity();
    1.80 +	gluPerspective(45.0, (float)x / (float)y, 1.0, 1000.0);
    1.81 +}
    1.82 +
    1.83 +void keyb(unsigned char key, int x, int y)
    1.84 +{
    1.85 +	switch(key) {
    1.86 +	case 27:
    1.87 +		exit(0);
    1.88 +	}
    1.89 +}
    1.90 +
    1.91 +static int bnstate[32];
    1.92 +void mouse(int bn, int state, int x, int y)
    1.93 +{
    1.94 +	bnstate[bn - GLUT_LEFT_BUTTON] = state == GLUT_DOWN;
    1.95 +	if(bn == GLUT_LEFT_BUTTON) {
    1.96 +		psys_set_rate(ps, state == GLUT_DOWN ? 1.0 : 0.0, 0);
    1.97 +		psys_set_pos(ps, get_mouse_hit(x, y), 0);
    1.98 +	}
    1.99 +}
   1.100 +
   1.101 +void motion(int x, int y)
   1.102 +{
   1.103 +	if(bnstate[0]) {
   1.104 +		psys_set_pos(ps, get_mouse_hit(x, y), 0);
   1.105 +	}
   1.106 +}
   1.107 +
   1.108 +vec3_t get_mouse_hit(float x, float y)
   1.109 +{
   1.110 +	double mv[16], proj[16];
   1.111 +	int vp[4];
   1.112 +	double res_x, res_y, res_z;
   1.113 +	float t;
   1.114 +	vec3_t res, pnear, pfar;
   1.115 +
   1.116 +	glGetDoublev(GL_MODELVIEW_MATRIX, mv);
   1.117 +	glGetDoublev(GL_PROJECTION_MATRIX, proj);
   1.118 +	glGetIntegerv(GL_VIEWPORT, vp);
   1.119 +
   1.120 +	y = vp[3] - y;
   1.121 +
   1.122 +	gluUnProject(x, y, 0, mv, proj, vp, &res_x, &res_y, &res_z);
   1.123 +	pnear.x = res_x;
   1.124 +	pnear.y = res_y;
   1.125 +	pnear.z = res_z;
   1.126 +
   1.127 +	gluUnProject(x, y, 1, mv, proj, vp, &res_x, &res_y, &res_z);
   1.128 +	pfar.x = res_x;
   1.129 +	pfar.y = res_y;
   1.130 +	pfar.z = res_z;
   1.131 +
   1.132 +	t = fabs(pnear.z) / fabs(pfar.z - pnear.z);
   1.133 +	res = v3_add(pnear, v3_scale(v3_sub(pfar, pnear), t));
   1.134 +
   1.135 +	return res;
   1.136 +}