nuclear@1: #include <stdio.h>
nuclear@1: #include <stdlib.h>
nuclear@1: 
nuclear@1: #ifndef __APPLE__
nuclear@1: #include <GL/glut.h>
nuclear@1: #else
nuclear@1: #include <GLUT/glut.h>
nuclear@1: #endif
nuclear@1: 
nuclear@1: #include <vmath.h>
nuclear@1: #include "psys.h"
nuclear@1: 
nuclear@1: void disp(void);
nuclear@1: void idle(void);
nuclear@1: void reshape(int x, int y);
nuclear@1: void keyb(unsigned char key, int x, int y);
nuclear@1: void mouse(int bn, int state, int x, int y);
nuclear@1: void motion(int x, int y);
nuclear@1: vec3_t get_mouse_hit(float x, float y);
nuclear@1: 
nuclear@1: struct psys_emitter *ps;
nuclear@1: 
nuclear@1: int main(int argc, char **argv)
nuclear@1: {
nuclear@1: 	glutInitWindowSize(800, 600);
nuclear@1: 	glutInit(&argc, argv);
nuclear@1: 	glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
nuclear@1: 	glutCreateWindow("libpsys example: simple");
nuclear@1: 
nuclear@1: 	glutDisplayFunc(disp);
nuclear@1: 	glutReshapeFunc(reshape);
nuclear@1: 	glutKeyboardFunc(keyb);
nuclear@1: 	glutMouseFunc(mouse);
nuclear@1: 	glutMotionFunc(motion);
nuclear@1: 	glutIdleFunc(idle);
nuclear@1: 
nuclear@1: 	glEnable(GL_CULL_FACE);
nuclear@1: 
nuclear@1: 	if(!(ps = psys_create())) {
nuclear@1: 		return 1;
nuclear@1: 	}
nuclear@1: 	psys_set_grav(ps, v3_cons(0, -1, 0), 0);
nuclear@1: 	psys_set_life(ps, 2, 0);
nuclear@1: 
nuclear@1: 	glutMainLoop();
nuclear@1: 	return 0;
nuclear@1: }
nuclear@1: 
nuclear@1: void disp(void)
nuclear@1: {
nuclear@1: 	static unsigned int prev_msec;
nuclear@1: 	unsigned int msec = glutGet(GLUT_ELAPSED_TIME);
nuclear@1: 
nuclear@1: 	glMatrixMode(GL_MODELVIEW);
nuclear@1: 	glLoadIdentity();
nuclear@1: 	glTranslatef(0, 0, -10);
nuclear@1: 
nuclear@1: 	glClear(GL_COLOR_BUFFER_BIT);
nuclear@1: 
nuclear@1: 	psys_update(ps, (msec - prev_msec) / 1000.0);
nuclear@1: 	psys_draw(ps);
nuclear@1: 
nuclear@1: 	glutSwapBuffers();
nuclear@1: }
nuclear@1: 
nuclear@1: void idle(void)
nuclear@1: {
nuclear@1: 	glutPostRedisplay();
nuclear@1: }
nuclear@1: 
nuclear@1: void reshape(int x, int y)
nuclear@1: {
nuclear@1: 	glViewport(0, 0, x, y);
nuclear@1: 
nuclear@1: 	glMatrixMode(GL_PROJECTION);
nuclear@1: 	glLoadIdentity();
nuclear@1: 	gluPerspective(45.0, (float)x / (float)y, 1.0, 1000.0);
nuclear@1: }
nuclear@1: 
nuclear@1: void keyb(unsigned char key, int x, int y)
nuclear@1: {
nuclear@1: 	switch(key) {
nuclear@1: 	case 27:
nuclear@1: 		exit(0);
nuclear@1: 	}
nuclear@1: }
nuclear@1: 
nuclear@1: static int bnstate[32];
nuclear@1: void mouse(int bn, int state, int x, int y)
nuclear@1: {
nuclear@1: 	bnstate[bn - GLUT_LEFT_BUTTON] = state == GLUT_DOWN;
nuclear@1: 	if(bn == GLUT_LEFT_BUTTON) {
nuclear@1: 		psys_set_rate(ps, state == GLUT_DOWN ? 1.0 : 0.0, 0);
nuclear@1: 		psys_set_pos(ps, get_mouse_hit(x, y), 0);
nuclear@1: 	}
nuclear@1: }
nuclear@1: 
nuclear@1: void motion(int x, int y)
nuclear@1: {
nuclear@1: 	if(bnstate[0]) {
nuclear@1: 		psys_set_pos(ps, get_mouse_hit(x, y), 0);
nuclear@1: 	}
nuclear@1: }
nuclear@1: 
nuclear@1: vec3_t get_mouse_hit(float x, float y)
nuclear@1: {
nuclear@1: 	double mv[16], proj[16];
nuclear@1: 	int vp[4];
nuclear@1: 	double res_x, res_y, res_z;
nuclear@1: 	float t;
nuclear@1: 	vec3_t res, pnear, pfar;
nuclear@1: 
nuclear@1: 	glGetDoublev(GL_MODELVIEW_MATRIX, mv);
nuclear@1: 	glGetDoublev(GL_PROJECTION_MATRIX, proj);
nuclear@1: 	glGetIntegerv(GL_VIEWPORT, vp);
nuclear@1: 
nuclear@1: 	y = vp[3] - y;
nuclear@1: 
nuclear@1: 	gluUnProject(x, y, 0, mv, proj, vp, &res_x, &res_y, &res_z);
nuclear@1: 	pnear.x = res_x;
nuclear@1: 	pnear.y = res_y;
nuclear@1: 	pnear.z = res_z;
nuclear@1: 
nuclear@1: 	gluUnProject(x, y, 1, mv, proj, vp, &res_x, &res_y, &res_z);
nuclear@1: 	pfar.x = res_x;
nuclear@1: 	pfar.y = res_y;
nuclear@1: 	pfar.z = res_z;
nuclear@1: 
nuclear@1: 	t = fabs(pnear.z) / fabs(pfar.z - pnear.z);
nuclear@1: 	res = v3_add(pnear, v3_scale(v3_sub(pfar, pnear), t));
nuclear@1: 
nuclear@1: 	return res;
nuclear@1: }