git.mutantstargoat.com Git - hair/blob - src/main.cc

   1 #include <GL/glew.h>
   2 #include <GL/glut.h>
   3
   4 #include <assert.h>
   5 #include <stdlib.h>
   6 #include <stdio.h>
   7 #include <string>
   8
   9 #include <gmath/gmath.h>
  10
  11 #include "mesh.h"
  12 #include "hair.h"
  13 #include "object.h"
  14
  15 #define MAX_NUM_SPAWNS 400
  16 #define THRESH 0.5
  17
  18 static bool init();
  19 static void cleanup();
  20 static void display();
  21 static void reshape(int x, int y);
  22 static void keydown(unsigned char key, int x, int y);
  23 static void keyup(unsigned char key, int x, int y);
  24 static void mouse(int bn, int st, int x, int y);
  25 static void motion(int x, int y);
  26 static void idle();
  27
  28 static std::vector<Mesh*> meshes;
  29 static Mesh *mesh_head;
  30 static Hair hair;
  31
  32 static int win_width, win_height;
  33 static float cam_theta, cam_phi = 25, cam_dist = 8;
  34 static float head_rz, head_rx; /* rot angles x, z axis */
  35 static Mat4 head_xform;
  36 static CollSphere coll_sphere; /* sphere used for collision detection */
  37
  38 int main(int argc, char **argv)
  39 {
  40         glutInit(&argc, argv);
  41         glutInitWindowSize(800, 600);
  42         glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE);
  43         glutCreateWindow("hair test");
  44
  45         /* for the keydown, keyup functions to work */
  46         glutSetKeyRepeat(GLUT_KEY_REPEAT_OFF);
  47
  48         glutDisplayFunc(display);
  49         glutReshapeFunc(reshape);
  50         glutKeyboardFunc(keydown);
  51         glutKeyboardUpFunc(keyup);
  52         glutMouseFunc(mouse);
  53         glutMotionFunc(motion);
  54         glutIdleFunc(idle);
  55
  56         if(!init()) {
  57                 return 1;
  58         }
  59         atexit(cleanup);
  60
  61         glutMainLoop();
  62         return 0;
  63 }
  64
  65 static bool init()
  66 {
  67         glewInit();
  68
  69         glEnable(GL_DEPTH_TEST);
  70         glEnable(GL_CULL_FACE);
  71         glEnable(GL_COLOR_MATERIAL);
  72
  73         glEnable(GL_LIGHTING);
  74         glEnable(GL_LIGHT0);
  75
  76         glClearColor(0.5, 0.5, 0.5, 1);
  77         meshes = load_meshes("data/head.fbx");
  78         if (meshes.empty()) {
  79                 fprintf(stderr, "Failed to load mesh.\n");
  80                 return false;
  81         }
  82
  83         for(size_t i=0; i<meshes.size(); i++) {
  84                 meshes[i]->calc_bbox();
  85 /*
  86                 Vec3 v0 = meshes[i]->bbox.v0;
  87                 Vec3 v1 = meshes[i]->bbox.v1;
  88
  89                 printf("mesh: %s\n", meshes[i]->name.c_str());
  90                 printf("AABB mesh %d: v0: (%f, %f, %f) v1: (%f, %f, %f)\n",
  91                                 (int)i, v0.x, v0.y, v0.z, v1.x, v1.y, v1.z);
  92 */
  93                 meshes[i]->update_vbo(MESH_ALL);
  94 /*
  95                 printf("num vertices: %d num triangles: %d\n",
  96                                 (int)meshes[i]->vertices.size(),
  97                                 (int)meshes[i]->indices.size() / 3);
  98 */
  99                 if(meshes[i]->name == "head") {
 100                         mesh_head = meshes[i];
 101                 }
 102         }
 103         if(!mesh_head) {
 104                 fprintf(stderr, "Failed to find the head mesh.\n");
 105                 return false;
 106         }
 107
 108         coll_sphere.radius = 1.0;
 109         coll_sphere.center = Vec3(0, 0.6, 0.53);
 110
 111         if(!hair.init(mesh_head, MAX_NUM_SPAWNS, THRESH)) {
 112                 fprintf(stderr, "Failed to initialize hair\n");
 113                 return false;
 114         }
 115
 116         hair.add_collider(&coll_sphere);
 117
 118         return true;
 119 }
 120
 121 static void cleanup()
 122 {
 123         for(size_t i=0; i<meshes.size(); i++) {
 124                 delete meshes[i];
 125         }
 126 }
 127
 128 static void display()
 129 {
 130         static unsigned long prev_time;
 131         unsigned long msec = glutGet(GLUT_ELAPSED_TIME);
 132         float dt = (float)(msec - prev_time) / 1000.0;
 133         prev_time = msec;
 134
 135         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 136
 137         head_xform = Mat4::identity;
 138         head_xform.rotate_x(gph::deg_to_rad(head_rx));
 139         head_xform.rotate_z(-gph::deg_to_rad(head_rz));
 140
 141         glMatrixMode(GL_MODELVIEW);
 142         glLoadIdentity();
 143         glTranslatef(0, 0, -cam_dist);
 144         glRotatef(cam_phi, 1, 0, 0);
 145         glRotatef(cam_theta, 0, 1, 0);
 146         /* multiplying with the head rot matrix */
 147         glPushMatrix();
 148         glMultMatrixf(head_xform[0]);
 149         glPushAttrib(GL_LINE_BIT);
 150         glLineWidth(1);
 151         glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
 152         for(size_t i=0; i<meshes.size(); i++) {
 153                 meshes[i]->draw();
 154         }
 155         glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
 156         glPopAttrib();
 157
 158         glPopMatrix();
 159
 160         hair.set_transform(head_xform);
 161         hair.update(dt);
 162         hair.draw();
 163
 164 /*
 165         glPushAttrib(GL_ENABLE_BIT);
 166         glDisable(GL_DEPTH_TEST);
 167         glDisable(GL_LIGHTING);
 168         glBegin(GL_POINTS);
 169         for (int i=0; i<500; i++) {
 170                 Vec3 p;
 171                 p.x = (float)rand() / RAND_MAX * 8 - 4;
 172                 p.y = (float)rand() / RAND_MAX * 4;
 173                 p.z = 0;
 174
 175                 Vec3 tmp = inverse(head_xform) * p;
 176                 if(coll_sphere.contains(tmp)) {
 177                         glColor3f(1, 0, 0);
 178                 }
 179                 else glColor3f(0, 1, 0);
 180
 181                 glVertex3f(p.x, p.y, p.z);
 182         }
 183         glEnd();
 184         glPopAttrib();
 185         */
 186
 187         glutSwapBuffers();
 188         assert(glGetError() == GL_NO_ERROR);
 189 }
 190
 191 static void reshape(int x, int y)
 192 {
 193         glViewport(0, 0, x, y);
 194         win_width = x;
 195         win_height = y;
 196
 197         glMatrixMode(GL_PROJECTION);
 198         glLoadIdentity();
 199         gluPerspective(50.0, (float)x / (float)y, 0.5, 500.0);
 200 }
 201
 202 static bool hpressed;
 203 static void keydown(unsigned char key, int /*x*/, int /*y*/)
 204 {
 205         switch(key) {
 206         case 'h':
 207         case 'H':
 208                 hpressed = true;
 209                 break;
 210         case 27:
 211                 exit(0);
 212         default:
 213                 break;
 214         }
 215 }
 216
 217 static void keyup(unsigned char key, int /*x*/, int /*y*/)
 218 {
 219         switch(key) {
 220         case 'h':
 221         case 'H':
 222                 hpressed = false;
 223                 break;
 224         default:
 225                 break;
 226         }
 227 }
 228
 229 bool bnstate[8];
 230 int prev_x, prev_y;
 231
 232 static void mouse(int bn, int st, int x, int y)
 233 {
 234         bnstate[bn] = st == GLUT_DOWN;
 235         prev_x = x;
 236         prev_y = y;
 237 }
 238
 239 static void motion(int x, int y)
 240 {
 241         int dx = x - prev_x;
 242         int dy = y - prev_y;
 243         prev_x = x;
 244         prev_y = y;
 245
 246         if(!dx && !dy) return;
 247
 248         if(hpressed) {
 249                 if(bnstate[0]) {
 250                         head_rz += dx * 0.5;
 251                         head_rx += dy * 0.5;
 252
 253                         if(head_rx < -45) head_rx = -45;
 254                         if(head_rx > 45) head_rx = 45;
 255
 256                         if(head_rz < -90) head_rz = -90;
 257                         if(head_rz > 90) head_rz = 30;
 258                 }
 259         }
 260         else {
 261                 if(bnstate[0]) {
 262                         cam_theta += dx * 0.5;
 263                         cam_phi += dy * 0.5;
 264
 265                         if(cam_phi < -90) cam_phi = -90;
 266                         if(cam_phi > 90) cam_phi = 90;
 267                 }
 268                 if(bnstate[2]) {
 269                         cam_dist += dy * 0.1;
 270                         if(cam_dist < 0) cam_dist = 0;
 271                 }
 272         }
 273 }
 274
 275 static void idle()
 276 {
 277         glutPostRedisplay();
 278 }