libpsys

annotate examples/simple/simple.c @ 8:a10f19674147

find changesets by author, revision, files, or words in the commit message
ha!
author John Tsiombikas <nuclear@mutantstargoat.com>
date Tue, 27 Sep 2011 21:47:27 +0300
parents 6e5342a2529a
children 9c24273f211b
rev   line source
nuclear@1 1 #include <stdio.h>
nuclear@1 2 #include <stdlib.h>
nuclear@2 3 #include <assert.h>
nuclear@1 4
nuclear@1 5 #ifndef __APPLE__
nuclear@1 6 #include <GL/glut.h>
nuclear@1 7 #else
nuclear@1 8 #include <GLUT/glut.h>
nuclear@1 9 #endif
nuclear@1 10
nuclear@1 11 #include <vmath.h>
nuclear@2 12 #include <imago2.h>
nuclear@1 13 #include "psys.h"
nuclear@1 14
nuclear@8 15 void cleanup(void);
nuclear@1 16 void disp(void);
nuclear@1 17 void idle(void);
nuclear@1 18 void reshape(int x, int y);
nuclear@1 19 void keyb(unsigned char key, int x, int y);
nuclear@1 20 void mouse(int bn, int state, int x, int y);
nuclear@1 21 void motion(int x, int y);
nuclear@1 22 vec3_t get_mouse_hit(float x, float y);
nuclear@2 23 unsigned int load_texture(const char *fname);
nuclear@1 24
nuclear@1 25 struct psys_emitter *ps;
nuclear@2 26 unsigned int tex;
nuclear@1 27
nuclear@1 28 int main(int argc, char **argv)
nuclear@1 29 {
nuclear@1 30 glutInitWindowSize(800, 600);
nuclear@1 31 glutInit(&argc, argv);
nuclear@1 32 glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
nuclear@1 33 glutCreateWindow("libpsys example: simple");
nuclear@1 34
nuclear@1 35 glutDisplayFunc(disp);
nuclear@1 36 glutReshapeFunc(reshape);
nuclear@1 37 glutKeyboardFunc(keyb);
nuclear@1 38 glutMouseFunc(mouse);
nuclear@1 39 glutMotionFunc(motion);
nuclear@1 40 glutIdleFunc(idle);
nuclear@1 41
nuclear@2 42 glClearColor(0.05, 0.05, 0.05, 1);
nuclear@2 43
nuclear@2 44 if(!(tex = load_texture("pimg.png"))) {
nuclear@8 45 fprintf(stderr, "failed to load the texture\n");
nuclear@2 46 return 1;
nuclear@2 47 }
nuclear@1 48
nuclear@1 49 if(!(ps = psys_create())) {
nuclear@1 50 return 1;
nuclear@1 51 }
nuclear@8 52 psys_set_value3(&ps->attr.grav, 0, v3_cons(0, -9, 0));
nuclear@8 53 psys_set_anm_rnd(&ps->attr.life, 0, 2, 0);
nuclear@8 54 psys_set_value3(&ps->attr.spawn_range, 0, v3_cons(0.2, 0.2, 0.2));
nuclear@8 55 psys_set_anm_rnd3(&ps->attr.dir, 0, v3_cons(0, 0, 0), v3_cons(2, 2, 2));
nuclear@8 56 ps->attr.tex = tex;
nuclear@8 57
nuclear@8 58 atexit(cleanup);
nuclear@1 59
nuclear@1 60 glutMainLoop();
nuclear@1 61 return 0;
nuclear@1 62 }
nuclear@1 63
nuclear@8 64 void cleanup(void)
nuclear@8 65 {
nuclear@8 66 psys_free(ps);
nuclear@8 67 }
nuclear@8 68
nuclear@1 69 void disp(void)
nuclear@1 70 {
nuclear@1 71 static unsigned int prev_msec;
nuclear@1 72 unsigned int msec = glutGet(GLUT_ELAPSED_TIME);
nuclear@1 73
nuclear@1 74 glMatrixMode(GL_MODELVIEW);
nuclear@1 75 glLoadIdentity();
nuclear@1 76 glTranslatef(0, 0, -10);
nuclear@1 77
nuclear@1 78 glClear(GL_COLOR_BUFFER_BIT);
nuclear@1 79
nuclear@1 80 psys_update(ps, (msec - prev_msec) / 1000.0);
nuclear@1 81 psys_draw(ps);
nuclear@1 82
nuclear@1 83 glutSwapBuffers();
nuclear@2 84 assert(glGetError() == GL_NO_ERROR);
nuclear@1 85 }
nuclear@1 86
nuclear@1 87 void idle(void)
nuclear@1 88 {
nuclear@1 89 glutPostRedisplay();
nuclear@1 90 }
nuclear@1 91
nuclear@1 92 void reshape(int x, int y)
nuclear@1 93 {
nuclear@1 94 glViewport(0, 0, x, y);
nuclear@1 95
nuclear@1 96 glMatrixMode(GL_PROJECTION);
nuclear@1 97 glLoadIdentity();
nuclear@1 98 gluPerspective(45.0, (float)x / (float)y, 1.0, 1000.0);
nuclear@1 99 }
nuclear@1 100
nuclear@1 101 void keyb(unsigned char key, int x, int y)
nuclear@1 102 {
nuclear@1 103 switch(key) {
nuclear@1 104 case 27:
nuclear@1 105 exit(0);
nuclear@1 106 }
nuclear@1 107 }
nuclear@1 108
nuclear@1 109 static int bnstate[32];
nuclear@1 110 void mouse(int bn, int state, int x, int y)
nuclear@1 111 {
nuclear@1 112 bnstate[bn - GLUT_LEFT_BUTTON] = state == GLUT_DOWN;
nuclear@1 113 if(bn == GLUT_LEFT_BUTTON) {
nuclear@8 114 psys_set_value(&ps->attr.rate, 0, state == GLUT_DOWN ? 30.0 : 0.0);
nuclear@1 115 psys_set_pos(ps, get_mouse_hit(x, y), 0);
nuclear@1 116 }
nuclear@1 117 }
nuclear@1 118
nuclear@1 119 void motion(int x, int y)
nuclear@1 120 {
nuclear@1 121 if(bnstate[0]) {
nuclear@1 122 psys_set_pos(ps, get_mouse_hit(x, y), 0);
nuclear@1 123 }
nuclear@1 124 }
nuclear@1 125
nuclear@1 126 vec3_t get_mouse_hit(float x, float y)
nuclear@1 127 {
nuclear@1 128 double mv[16], proj[16];
nuclear@1 129 int vp[4];
nuclear@1 130 double res_x, res_y, res_z;
nuclear@1 131 float t;
nuclear@1 132 vec3_t res, pnear, pfar;
nuclear@1 133
nuclear@1 134 glGetDoublev(GL_MODELVIEW_MATRIX, mv);
nuclear@1 135 glGetDoublev(GL_PROJECTION_MATRIX, proj);
nuclear@1 136 glGetIntegerv(GL_VIEWPORT, vp);
nuclear@1 137
nuclear@1 138 y = vp[3] - y;
nuclear@1 139
nuclear@1 140 gluUnProject(x, y, 0, mv, proj, vp, &res_x, &res_y, &res_z);
nuclear@1 141 pnear.x = res_x;
nuclear@1 142 pnear.y = res_y;
nuclear@1 143 pnear.z = res_z;
nuclear@1 144
nuclear@1 145 gluUnProject(x, y, 1, mv, proj, vp, &res_x, &res_y, &res_z);
nuclear@1 146 pfar.x = res_x;
nuclear@1 147 pfar.y = res_y;
nuclear@1 148 pfar.z = res_z;
nuclear@1 149
nuclear@1 150 t = fabs(pnear.z) / fabs(pfar.z - pnear.z);
nuclear@1 151 res = v3_add(pnear, v3_scale(v3_sub(pfar, pnear), t));
nuclear@1 152
nuclear@1 153 return res;
nuclear@1 154 }
nuclear@2 155
nuclear@2 156 unsigned int load_texture(const char *fname)
nuclear@2 157 {
nuclear@2 158 void *pixels;
nuclear@2 159 int xsz, ysz;
nuclear@2 160 unsigned int tex;
nuclear@2 161
nuclear@2 162 if(!(pixels = img_load_pixels(fname, &xsz, &ysz, IMG_FMT_RGBA32))) {
nuclear@2 163 return 0;
nuclear@2 164 }
nuclear@2 165
nuclear@2 166 glGenTextures(1, &tex);
nuclear@2 167 glBindTexture(GL_TEXTURE_2D, tex);
nuclear@2 168 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
nuclear@2 169 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
nuclear@2 170 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
nuclear@2 171 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
nuclear@2 172 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, xsz, ysz, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
nuclear@2 173 img_free_pixels(pixels);
nuclear@2 174
nuclear@2 175 return tex;
nuclear@2 176 }