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 800
  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 unsigned int gen_grad_tex(int sz, const Vec3 &c0, const Vec3 &c1);
  29
  30 static std::vector<Mesh*> meshes;
  31 static Mesh *mesh_head;
  32 static Hair hair;
  33
  34 static unsigned int grad_tex;
  35
  36 static int win_width, win_height;
  37 static float cam_theta, cam_phi = 25, cam_dist = 8;
  38 static float head_rz, head_rx; /* rot angles x, z axis */
  39 static Mat4 head_xform;
  40 //static CollSphere coll_sphere; /* sphere used for collision detection */
  41
  42 int main(int argc, char **argv)
  43 {
  44         glutInit(&argc, argv);
  45         glutInitWindowSize(800, 600);
  46         glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE);
  47         glutCreateWindow("hair test");
  48
  49         /* for the keydown, keyup functions to work */
  50         glutSetKeyRepeat(GLUT_KEY_REPEAT_OFF);
  51
  52         glutDisplayFunc(display);
  53         glutReshapeFunc(reshape);
  54         glutKeyboardFunc(keydown);
  55         glutKeyboardUpFunc(keyup);
  56         glutMouseFunc(mouse);
  57         glutMotionFunc(motion);
  58         glutIdleFunc(idle);
  59
  60         if(!init()) {
  61                 return 1;
  62         }
  63         atexit(cleanup);
  64
  65         glutMainLoop();
  66         return 0;
  67 }
  68
  69 static bool init()
  70 {
  71         glewInit();
  72
  73         grad_tex = gen_grad_tex(32, Vec3(0, 0, 1), Vec3(0, 1, 0));
  74
  75         glEnable(GL_DEPTH_TEST);
  76         glEnable(GL_CULL_FACE);
  77 //      glEnable(GL_COLOR_MATERIAL);
  78
  79         glEnable(GL_LIGHTING);
  80         glEnable(GL_LIGHT0);
  81
  82         glClearColor(0.5, 0.5, 0.5, 1);
  83         meshes = load_meshes("data/head.fbx");
  84         if (meshes.empty()) {
  85                 fprintf(stderr, "Failed to load mesh.\n");
  86                 return false;
  87         }
  88
  89         for(size_t i=0; i<meshes.size(); i++) {
  90                 meshes[i]->calc_bbox();
  91 /*
  92                 Vec3 v0 = meshes[i]->bbox.v0;
  93                 Vec3 v1 = meshes[i]->bbox.v1;
  94
  95                 printf("mesh: %s\n", meshes[i]->name.c_str());
  96                 printf("AABB mesh %d: v0: (%f, %f, %f) v1: (%f, %f, %f)\n",
  97                                 (int)i, v0.x, v0.y, v0.z, v1.x, v1.y, v1.z);
  98 */
  99                 meshes[i]->update_vbo(MESH_ALL);
 100 /*
 101                 printf("num vertices: %d num triangles: %d\n",
 102                                 (int)meshes[i]->vertices.size(),
 103                                 (int)meshes[i]->indices.size() / 3);
 104 */
 105                 if(meshes[i]->name == "head") {
 106                         mesh_head = meshes[i];
 107                 }
 108         }
 109         if(!mesh_head) {
 110                 fprintf(stderr, "Failed to find the head mesh.\n");
 111                 return false;
 112         }
 113
 114 //      coll_sphere.radius = 1.0;
 115 //      coll_sphere.center = Vec3(0, 0.6, 0.53);
 116
 117         if(!hair.init(mesh_head, MAX_NUM_SPAWNS, THRESH)) {
 118                 fprintf(stderr, "Failed to initialize hair\n");
 119                 return false;
 120         }
 121
 122 //      hair.add_collider(&coll_sphere);
 123
 124         return true;
 125 }
 126
 127 static void cleanup()
 128 {
 129         for(size_t i=0; i<meshes.size(); i++) {
 130                 delete meshes[i];
 131         }
 132 }
 133
 134 static void display()
 135 {
 136         static unsigned long prev_time;
 137         unsigned long msec = glutGet(GLUT_ELAPSED_TIME);
 138         float dt = (float)(msec - prev_time) / 1000.0;
 139         prev_time = msec;
 140
 141         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 142
 143         head_xform = Mat4::identity;
 144         head_xform.rotate_x(gph::deg_to_rad(head_rx));
 145         head_xform.rotate_z(-gph::deg_to_rad(head_rz));
 146
 147         glMatrixMode(GL_MODELVIEW);
 148         glLoadIdentity();
 149         glTranslatef(0, 0, -cam_dist);
 150         glRotatef(cam_phi, 1, 0, 0);
 151         glRotatef(cam_theta, 0, 1, 0);
 152         /* multiplying with the head rot matrix */
 153         glPushMatrix();
 154         glMultMatrixf(head_xform[0]);
 155 /*
 156         glPushAttrib(GL_LINE_BIT);
 157         glLineWidth(1);
 158         glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
 159 */
 160         for(size_t i=0; i<meshes.size(); i++) {
 161                 meshes[i]->draw();
 162         }
 163 /*
 164         glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
 165         glPopAttrib();
 166 */
 167
 168         glPopMatrix();
 169
 170         hair.set_transform(head_xform);
 171         hair.update(dt);
 172         hair.draw();
 173
 174 /*
 175         glPushAttrib(GL_ENABLE_BIT);
 176         glDisable(GL_DEPTH_TEST);
 177         glDisable(GL_LIGHTING);
 178         glBegin(GL_POINTS);
 179         for (int i=0; i<500; i++) {
 180                 Vec3 p;
 181                 p.x = (float)rand() / RAND_MAX * 8 - 4;
 182                 p.y = (float)rand() / RAND_MAX * 4;
 183                 p.z = 0;
 184
 185                 Vec3 tmp = inverse(head_xform) * p;
 186                 if(coll_sphere.contains(tmp)) {
 187                         glColor3f(1, 0, 0);
 188                 }
 189                 else glColor3f(0, 1, 0);
 190
 191                 glVertex3f(p.x, p.y, p.z);
 192         }
 193         glEnd();
 194         glPopAttrib();
 195 */
 196         float plane[4] = {
 197                 0, 0, 0.5 / 350, 0.5
 198         };
 199
 200         glPushMatrix();
 201         glRotatef(90, 1, 0, 0);
 202
 203         glPushAttrib(GL_ENABLE_BIT);
 204         glDisable(GL_LIGHTING);
 205         glEnable(GL_TEXTURE_1D);
 206         glBindTexture(GL_TEXTURE_1D, grad_tex);
 207         glFrontFace(GL_CW);
 208         glEnable(GL_TEXTURE_GEN_S);
 209         glTexGenfv(GL_S, GL_OBJECT_PLANE, plane);
 210         glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR);
 211         glColor3f(1, 1, 1);
 212
 213         glDepthMask(0);
 214
 215         glutSolidSphere(350, 16, 8);
 216         glDisable(GL_TEXTURE_1D);
 217
 218         glColor3f(0.2, 0.2, 0.2);
 219         glutWireSphere(350, 32, 16);
 220
 221         glDepthMask(1);
 222         glFrontFace(GL_CCW);
 223         glPopAttrib();
 224
 225         glPopMatrix();
 226
 227         glutSwapBuffers();
 228         assert(glGetError() == GL_NO_ERROR);
 229 }
 230
 231 static void reshape(int x, int y)
 232 {
 233         glViewport(0, 0, x, y);
 234         win_width = x;
 235         win_height = y;
 236
 237         glMatrixMode(GL_PROJECTION);
 238         glLoadIdentity();
 239         gluPerspective(50.0, (float)x / (float)y, 0.5, 500.0);
 240 }
 241
 242 static bool hpressed;
 243 static void keydown(unsigned char key, int /*x*/, int /*y*/)
 244 {
 245         switch(key) {
 246         case 'h':
 247         case 'H':
 248                 hpressed = true;
 249                 break;
 250         case 27:
 251                 exit(0);
 252         default:
 253                 break;
 254         }
 255 }
 256
 257 static void keyup(unsigned char key, int /*x*/, int /*y*/)
 258 {
 259         switch(key) {
 260         case 'h':
 261         case 'H':
 262                 hpressed = false;
 263                 break;
 264         default:
 265                 break;
 266         }
 267 }
 268
 269 bool bnstate[8];
 270 int prev_x, prev_y;
 271
 272 static void mouse(int bn, int st, int x, int y)
 273 {
 274         bnstate[bn] = st == GLUT_DOWN;
 275         prev_x = x;
 276         prev_y = y;
 277 }
 278
 279 static void motion(int x, int y)
 280 {
 281         int dx = x - prev_x;
 282         int dy = y - prev_y;
 283         prev_x = x;
 284         prev_y = y;
 285
 286         if(!dx && !dy) return;
 287
 288         if(hpressed) {
 289                 if(bnstate[0]) {
 290                         head_rz += dx * 0.5;
 291                         head_rx += dy * 0.5;
 292
 293                         if(head_rx < -45) head_rx = -45;
 294                         if(head_rx > 45) head_rx = 45;
 295
 296                         if(head_rz < -90) head_rz = -90;
 297                         if(head_rz > 90) head_rz = 30;
 298                 }
 299         }
 300         else {
 301                 if(bnstate[0]) {
 302                         cam_theta += dx * 0.5;
 303                         cam_phi += dy * 0.5;
 304
 305                         if(cam_phi < -90) cam_phi = -90;
 306                         if(cam_phi > 90) cam_phi = 90;
 307                 }
 308                 if(bnstate[2]) {
 309                         cam_dist += dy * 0.1;
 310                         if(cam_dist < 0) cam_dist = 0;
 311                 }
 312         }
 313 }
 314
 315 static void idle()
 316 {
 317         glutPostRedisplay();
 318 }
 319
 320 static unsigned int gen_grad_tex(int sz, const Vec3 &c0, const Vec3 &c1)
 321 {
 322         unsigned char *pixels = new unsigned char[sz * 3];
 323         for(int i=0; i<sz; i++) {
 324                 float t = (float)i / (float)(sz - 1);
 325                 Vec3 color = c0 + (c1 - c0) * t;
 326                 pixels[i * 3] = color.x * 255;
 327                 pixels[i * 3 + 1] = color.y * 255;
 328                 pixels[i * 3 + 2] = color.z * 255;
 329         }
 330
 331         unsigned int tex;
 332         glGenTextures(1, &tex);
 333         glBindTexture(GL_TEXTURE_1D, tex);
 334
 335         glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 336         glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 337         glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 338
 339         glTexImage1D(GL_TEXTURE_1D, 0, GL_RGB, sz, 0, GL_RGB, GL_UNSIGNED_BYTE, pixels);
 340
 341         delete [] pixels;
 342
 343         return tex;
 344 }