libpsys

annotate examples/simple/simple.c @ 1:874a942853ad

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foobar
author John Tsiombikas <nuclear@mutantstargoat.com>
date Sat, 24 Sep 2011 20:44:42 +0300
parents
children 6e5342a2529a
rev   line source
nuclear@1 1 #include <stdio.h>
nuclear@1 2 #include <stdlib.h>
nuclear@1 3
nuclear@1 4 #ifndef __APPLE__
nuclear@1 5 #include <GL/glut.h>
nuclear@1 6 #else
nuclear@1 7 #include <GLUT/glut.h>
nuclear@1 8 #endif
nuclear@1 9
nuclear@1 10 #include <vmath.h>
nuclear@1 11 #include "psys.h"
nuclear@1 12
nuclear@1 13 void disp(void);
nuclear@1 14 void idle(void);
nuclear@1 15 void reshape(int x, int y);
nuclear@1 16 void keyb(unsigned char key, int x, int y);
nuclear@1 17 void mouse(int bn, int state, int x, int y);
nuclear@1 18 void motion(int x, int y);
nuclear@1 19 vec3_t get_mouse_hit(float x, float y);
nuclear@1 20
nuclear@1 21 struct psys_emitter *ps;
nuclear@1 22
nuclear@1 23 int main(int argc, char **argv)
nuclear@1 24 {
nuclear@1 25 glutInitWindowSize(800, 600);
nuclear@1 26 glutInit(&argc, argv);
nuclear@1 27 glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
nuclear@1 28 glutCreateWindow("libpsys example: simple");
nuclear@1 29
nuclear@1 30 glutDisplayFunc(disp);
nuclear@1 31 glutReshapeFunc(reshape);
nuclear@1 32 glutKeyboardFunc(keyb);
nuclear@1 33 glutMouseFunc(mouse);
nuclear@1 34 glutMotionFunc(motion);
nuclear@1 35 glutIdleFunc(idle);
nuclear@1 36
nuclear@1 37 glEnable(GL_CULL_FACE);
nuclear@1 38
nuclear@1 39 if(!(ps = psys_create())) {
nuclear@1 40 return 1;
nuclear@1 41 }
nuclear@1 42 psys_set_grav(ps, v3_cons(0, -1, 0), 0);
nuclear@1 43 psys_set_life(ps, 2, 0);
nuclear@1 44
nuclear@1 45 glutMainLoop();
nuclear@1 46 return 0;
nuclear@1 47 }
nuclear@1 48
nuclear@1 49 void disp(void)
nuclear@1 50 {
nuclear@1 51 static unsigned int prev_msec;
nuclear@1 52 unsigned int msec = glutGet(GLUT_ELAPSED_TIME);
nuclear@1 53
nuclear@1 54 glMatrixMode(GL_MODELVIEW);
nuclear@1 55 glLoadIdentity();
nuclear@1 56 glTranslatef(0, 0, -10);
nuclear@1 57
nuclear@1 58 glClear(GL_COLOR_BUFFER_BIT);
nuclear@1 59
nuclear@1 60 psys_update(ps, (msec - prev_msec) / 1000.0);
nuclear@1 61 psys_draw(ps);
nuclear@1 62
nuclear@1 63 glutSwapBuffers();
nuclear@1 64 }
nuclear@1 65
nuclear@1 66 void idle(void)
nuclear@1 67 {
nuclear@1 68 glutPostRedisplay();
nuclear@1 69 }
nuclear@1 70
nuclear@1 71 void reshape(int x, int y)
nuclear@1 72 {
nuclear@1 73 glViewport(0, 0, x, y);
nuclear@1 74
nuclear@1 75 glMatrixMode(GL_PROJECTION);
nuclear@1 76 glLoadIdentity();
nuclear@1 77 gluPerspective(45.0, (float)x / (float)y, 1.0, 1000.0);
nuclear@1 78 }
nuclear@1 79
nuclear@1 80 void keyb(unsigned char key, int x, int y)
nuclear@1 81 {
nuclear@1 82 switch(key) {
nuclear@1 83 case 27:
nuclear@1 84 exit(0);
nuclear@1 85 }
nuclear@1 86 }
nuclear@1 87
nuclear@1 88 static int bnstate[32];
nuclear@1 89 void mouse(int bn, int state, int x, int y)
nuclear@1 90 {
nuclear@1 91 bnstate[bn - GLUT_LEFT_BUTTON] = state == GLUT_DOWN;
nuclear@1 92 if(bn == GLUT_LEFT_BUTTON) {
nuclear@1 93 psys_set_rate(ps, state == GLUT_DOWN ? 1.0 : 0.0, 0);
nuclear@1 94 psys_set_pos(ps, get_mouse_hit(x, y), 0);
nuclear@1 95 }
nuclear@1 96 }
nuclear@1 97
nuclear@1 98 void motion(int x, int y)
nuclear@1 99 {
nuclear@1 100 if(bnstate[0]) {
nuclear@1 101 psys_set_pos(ps, get_mouse_hit(x, y), 0);
nuclear@1 102 }
nuclear@1 103 }
nuclear@1 104
nuclear@1 105 vec3_t get_mouse_hit(float x, float y)
nuclear@1 106 {
nuclear@1 107 double mv[16], proj[16];
nuclear@1 108 int vp[4];
nuclear@1 109 double res_x, res_y, res_z;
nuclear@1 110 float t;
nuclear@1 111 vec3_t res, pnear, pfar;
nuclear@1 112
nuclear@1 113 glGetDoublev(GL_MODELVIEW_MATRIX, mv);
nuclear@1 114 glGetDoublev(GL_PROJECTION_MATRIX, proj);
nuclear@1 115 glGetIntegerv(GL_VIEWPORT, vp);
nuclear@1 116
nuclear@1 117 y = vp[3] - y;
nuclear@1 118
nuclear@1 119 gluUnProject(x, y, 0, mv, proj, vp, &res_x, &res_y, &res_z);
nuclear@1 120 pnear.x = res_x;
nuclear@1 121 pnear.y = res_y;
nuclear@1 122 pnear.z = res_z;
nuclear@1 123
nuclear@1 124 gluUnProject(x, y, 1, mv, proj, vp, &res_x, &res_y, &res_z);
nuclear@1 125 pfar.x = res_x;
nuclear@1 126 pfar.y = res_y;
nuclear@1 127 pfar.z = res_z;
nuclear@1 128
nuclear@1 129 t = fabs(pnear.z) / fabs(pfar.z - pnear.z);
nuclear@1 130 res = v3_add(pnear, v3_scale(v3_sub(pfar, pnear), t));
nuclear@1 131
nuclear@1 132 return res;
nuclear@1 133 }