openglcanvas.cpp 23.9 KB
Newer Older
Luis Peñaranda's avatar
Luis Peñaranda committed
1 2
#include <QtGui>
#ifdef NEEDGLEE
3
  #include "GLee.h"
Luis Peñaranda's avatar
Luis Peñaranda committed
4 5 6
#endif
#include "openglcanvas.h"
#include <cmath>
7 8
#include <sys/types.h>  // for fstat, getpwuid, getuid
#include <sys/stat.h>   // for fstat
9 10 11
#ifndef _WIN32
#  include <pwd.h>        // for getpwuid (TODO: windows?)
#endif
12 13
#include <cstdio>       // for fopen, fclose, getc
#include <cstring>
14
#ifdef _WIN32
15 16
  #include <direct.h>
  #define GET_WORKDIR _getcwd
17 18
  #define OPEN_FILE _open
  #define LSEEK_FD _lseek
19
#else
20
  // unistd was included above
21
  #define GET_WORKDIR getcwd
22 23
  #define OPEN_FILE open
  #define LSEEK_FD lseek
24
#endif
Luis Peñaranda's avatar
Luis Peñaranda committed
25 26

#define PROGNAME "pano_interface"
27 28
#define VERT_SHADER_FILE "test_vertex_shader.vert"
#define FRAG_SHADER_FILE "fragment_shader.frag"
Luis Peñaranda's avatar
Luis Peñaranda committed
29

30 31 32 33 34 35 36 37
#define CONST_PI        3.141592653589793115997963468544185161590576171875
#define CONST_PI_2      1.5707963267948965579989817342720925807952880859375
#define CONST_PI_F      3.1415927410125732421875f
#define CONST_PI_2_F    1.57079637050628662109375f
//#define CONST_PI        (0x1.921fb54442d18p+1)
//#define CONST_PI_2      (0x1.921fb54442d18p+0)
//#define CONST_PI_F      (0x1.921fb6p+1f)
//#define CONST_PI_2_F    (0x1.921fb6p+0f)
Luis Peñaranda's avatar
Luis Peñaranda committed
38

Luis Peñaranda's avatar
Luis Peñaranda committed
39 40 41 42 43
OpenGLCanvas::OpenGLCanvas(QWidget *parent) :
    QGLWidget(parent)
{
    setFormat(QGL::DoubleBuffer | QGL::DepthBuffer);
    fov = 60.f;
Luis Peñaranda's avatar
Luis Peñaranda committed
44
    fov_max = 60.f; // TODO: I only use floats here because Leo did... check
Luis Peñaranda's avatar
Luis Peñaranda committed
45 46 47 48 49
    scale = 1.0f;
    center_lambda = 0.f;
    center_phi = 0.f;
    fov_scale_relation = "Square Root";
    visualization = "Perspective";
50
    auto_fov_max=false;
Luis Peñaranda's avatar
Luis Peñaranda committed
51 52 53 54 55 56 57 58 59 60 61 62 63

    time_frames = 0;
    time_timer.setInterval(0);
    connect(&time_timer, SIGNAL(timeout()), this, SLOT(slotTimer()));
    time_start = time_time.time();
}

void OpenGLCanvas::slotTimer(void) {
    updateGL();
}

void OpenGLCanvas::change_fov(double f){

Luis Peñaranda's avatar
Luis Peñaranda committed
64 65 66 67
    if (fov!=f && f>=1.f && f<=360.f)
        fov=f;
    if (fov<=fov_max)
        scale=1.f;
Luis Peñaranda's avatar
Luis Peñaranda committed
68 69
    //else if (fov>295.f)
    //    scale = 0.02f; // TODO: check this value wrt fov_max
Luis Peñaranda's avatar
Luis Peñaranda committed
70
    else {
Luis Peñaranda's avatar
Luis Peñaranda committed
71 72 73 74 75 76 77 78 79 80 81 82
        if (fov_scale_relation == "Naive")
            scale=fov_max/fov;
        else if (fov_scale_relation == "Square Root")
            scale=sqrt((360.f-fov_max-fov)/(360.-2*fov_max));
        else if (fov_scale_relation == "Linear")
            scale=(360.f-fov_max-fov)/(360.-2*fov_max);
        else if (fov_scale_relation == "Square Power")
            scale=powf((360.f-fov_max-fov)/(360.-2*fov_max),2);
        else if (fov_scale_relation == "Cubic Power")
            scale=powf((360.f-fov_max-fov)/(360.-2*fov_max),3);
        else if (fov_scale_relation == "Logarithm")
            scale=log(exp(1.f)+(1.f-exp(1.f))*(fov-fov_max)/(360.-2*fov_max));
Luis Peñaranda's avatar
Luis Peñaranda committed
83 84 85 86
    }

//    scale = 0.3f;

Luis Peñaranda's avatar
Luis Peñaranda committed
87
    fprintf(stderr,"change fov, fov=%f, fov_max=%f, scale=%f\n",fov,fov_max,scale);
88
    emit fov_changed((int)fov);
Luis Peñaranda's avatar
Luis Peñaranda committed
89

Luis Peñaranda's avatar
Luis Peñaranda committed
90 91 92 93
    updateGL();

}

94
void OpenGLCanvas::change_fov(int new_fov){
Luis Peñaranda's avatar
Luis Peñaranda committed
95 96
    if(new_fov<=360&&new_fov>=1)
            change_fov((double)new_fov);
97 98 99 100 101 102 103 104 105
    if(auto_fov_max){
        if(new_fov<60)
            change_fov_max(60);
        else
            if(new_fov>180)
                change_fov_max(1);
            else
                change_fov_max(90-new_fov/2);
    }
106 107 108
}

void OpenGLCanvas::change_fov_max(int new_fov_max){
Luis Peñaranda's avatar
Luis Peñaranda committed
109
    if(new_fov_max<=360&&new_fov_max>=1)
Luis Peñaranda's avatar
Luis Peñaranda committed
110
            fov_max=(double)new_fov_max;
111 112
    if (fov<=fov_max)
        scale=1.f;
Luis Peñaranda's avatar
Luis Peñaranda committed
113 114
    //else if (fov>295.f)
    //    scale = 0.02f; // TODO: check this value wrt fov_max
115 116 117 118 119 120 121 122 123 124 125 126 127 128
    else {
        if (fov_scale_relation == "Naive")
            scale=fov_max/fov;
        else if (fov_scale_relation == "Square Root")
            scale=sqrt((360.f-fov_max-fov)/(360.-2*fov_max));
        else if (fov_scale_relation == "Linear")
            scale=(360.f-fov_max-fov)/(360.-2*fov_max);
        else if (fov_scale_relation == "Square Power")
            scale=powf((360.f-fov_max-fov)/(360.-2*fov_max),2);
        else if (fov_scale_relation == "Cubic Power")
            scale=powf((360.f-fov_max-fov)/(360.-2*fov_max),3);
        else if (fov_scale_relation == "Logarithm")
            scale=log(exp(1.f)+(1.f-exp(1.f))*(fov-fov_max)/(360.-2*fov_max));
    }
Luis Peñaranda's avatar
Luis Peñaranda committed
129
    fprintf(stderr,"change fov_max, fov=%f, fov_max=%f, new scale=%f\n",fov,fov_max,scale);
130
    emit max_fov_changed((int)fov_max);
Luis Peñaranda's avatar
Luis Peñaranda committed
131 132 133
    updateGL();
}

Luis Peñaranda's avatar
Luis Peñaranda committed
134 135 136 137 138 139 140 141 142
//void OpenGLCanvas::change_scale(double s){

//    if (scale!=s && s>=0.0 && s<=1.0) scale = s;
//    updateGL();

//}

void OpenGLCanvas::change_center_lambda(double lambda){

Luis Peñaranda's avatar
Luis Peñaranda committed
143
    if (center_lambda!=lambda && lambda>=-CONST_PI && lambda<=CONST_PI) {
Luis Peñaranda's avatar
Luis Peñaranda committed
144 145 146 147 148 149 150 151
        center_lambda = lambda;
        updateGL();
    }

}

void OpenGLCanvas::change_center_phi(double phi){

Luis Peñaranda's avatar
Luis Peñaranda committed
152
    if (center_phi!=phi && phi>=-CONST_PI_2 && phi<=CONST_PI_2) {
Luis Peñaranda's avatar
Luis Peñaranda committed
153 154 155 156 157 158
        center_phi = phi;
        updateGL();
    }

}

Luis Peñaranda's avatar
Luis Peñaranda committed
159 160 161 162 163 164
void OpenGLCanvas::re_center(){
    center_phi=.0f;
    center_lambda=.0f;
    updateGL();
}

Luis Peñaranda's avatar
Luis Peñaranda committed
165 166 167
void OpenGLCanvas::change_fov_scale_relation(QString name){

   fov_scale_relation = name;
Luis Peñaranda's avatar
Luis Peñaranda committed
168 169
   if (fov<fov_max) scale = 1.f;
   //else if (fov>295.f) scale = 0.01f;
Luis Peñaranda's avatar
Luis Peñaranda committed
170
   else{
Luis Peñaranda's avatar
Luis Peñaranda committed
171 172 173 174 175 176 177 178 179 180 181 182
       if (fov_scale_relation == "Naive")
           scale=fov_max/fov;
       else if (fov_scale_relation == "Square Root")
           scale=sqrt((360.f-fov_max-fov)/(360.-2*fov_max));
       else if (fov_scale_relation == "Linear")
           scale=(360.f-fov_max-fov)/(360.-2*fov_max);
       else if (fov_scale_relation == "Square Power")
           scale=powf((360.f-fov_max-fov)/(360.-2*fov_max),2);
       else if (fov_scale_relation == "Cubic Power")
           scale=powf((360.f-fov_max-fov)/(360.-2*fov_max),3);
       else if (fov_scale_relation == "Logarithm")
           scale=log(exp(1.f)+(1.f-exp(1.f))*(fov-fov_max)/(360.-2*fov_max));
Luis Peñaranda's avatar
Luis Peñaranda committed
183
   }
184
   fprintf(stderr,"changed scale relation, scale=%f, fov_max=%f\n",scale,fov_max);
Luis Peñaranda's avatar
Luis Peñaranda committed
185 186 187 188 189 190 191
   updateGL();

}

void OpenGLCanvas::change_visualization(QString name){

    visualization = name;
192
    updateGL();
Luis Peñaranda's avatar
Luis Peñaranda committed
193 194 195

}

196 197 198 199
// This function reads the contents of the ~/.panorc file and stores the
// options in private variables.
// TODO: windows
void OpenGLCanvas::read_config_file(){
200 201 202 203 204 205 206 207 208
#ifdef _WIN32
    char *filepath=(char*)malloc(512*sizeof(char));
    if(!GET_WORKDIR(filepath,512)){
        fprintf(stderr,"error reading config file\n");
        exit(-1);
    }
    strcat(filepath,"/panorc");
    // TODO
#else
209 210 211
    struct passwd *pw=getpwuid(getuid());
    char *filepath=pw->pw_dir;
    strcat(filepath,"/.panorc");
212 213
#endif
    fprintf(stderr,"the user config file is %s\n",filepath);
214 215 216 217
    shader_dir=(char*)malloc(512*sizeof(char));
    shader_dir[0]='\0';
    input_image_file=(char*)malloc(512*sizeof(char));
    input_image_file[0]='\0';
218
    char *read_line=(char*)malloc(64*sizeof(char));
219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247
    struct stat testbuf;
    if(stat(filepath,&testbuf)){
        fprintf(stderr,"~/.panorc does not exist\n");
    }else{
        FILE *rcfile=fopen(filepath,"r");
        char c;
        char *line=(char*)malloc(512*sizeof(char));
        while((c=getc(rcfile))!=EOF){
            while(c=='\n') // discard empty lines
                c=getc(rcfile);
            if(c==EOF)
                break;
            line[0]=c; // first char on the line was already read
            if(!fgets(line+1,511,rcfile)){
                fprintf(stderr,"error reading rcfile\n");
                exit(-1);
            }
            // check for 'shader_dir' option
            if(!strncmp(line,"shader_dir=",11)){
                strcpy(shader_dir,line+11);
                shader_dir[strlen(line)-12]='\0';
                fprintf(stderr,"shader_dir=%s\n",shader_dir);
            }
            // check for 'image_file' option
            if(!strncmp(line,"image_file=",11)){
                strcpy(input_image_file,line+11);
                input_image_file[strlen(line)-12]='\0';
                fprintf(stderr,"input_image_file=%s\n",input_image_file);
            }
Luis Peñaranda's avatar
Luis Peñaranda committed
248 249
            // check for 'max_fov' option
            if(!strncmp(line,"max_fov=",8)){
250 251 252
                strcpy(read_line,line+8);
                read_line[strlen(line)-9]='\0';
                fov_max=atof(read_line);
Luis Peñaranda's avatar
Luis Peñaranda committed
253 254
                fprintf(stderr,"max_fov=%f\n",fov_max);
            }
255 256 257 258 259 260 261
            // check for 'auto_max_fov' option
            if(!strncmp(line,"auto_max_fov=",13)){
                strcpy(read_line,line+13);
                read_line[strlen(line)-14]='\0';
                auto_fov_max=atof(read_line);
                fprintf(stderr,"auto_max_fov=%d\n",auto_fov_max);
            }
262 263 264
        }
        fclose(rcfile);
    }
Luis Peñaranda's avatar
Luis Peñaranda committed
265 266
    emit fov_changed((int)fov);
    emit max_fov_changed((int)fov_max);
267 268
}

269 270 271 272 273 274 275 276 277 278 279 280 281 282 283
void OpenGLCanvas::load_image(const char *new_image){
    const char * const progname=(char*)(PROGNAME);
    int textureSize=getTextureSize(progname,new_image);
    unsigned char * textureBytes=(unsigned char*)malloc(textureSize);
    int width,height;
    readTextureBytes(progname,new_image,textureBytes,&width,&height);
    glPixelStorei(GL_UNPACK_ALIGNMENT,1);
    GLuint tex;
    glGenTextures(1,&tex);
    glBindTexture(GL_TEXTURE_2D,tex);
    glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
    glTexImage2D(GL_TEXTURE_2D,0, GL_RGB, width,height,0,GL_RGB,GL_UNSIGNED_BYTE,textureBytes);
}

284
void OpenGLCanvas::change_input_image(){
285
    load_image(QFileDialog::getOpenFileName(this,tr("Choose Panorama File")).toStdString().c_str());
286 287 288
    updateGL();
}

Luis Peñaranda's avatar
Luis Peñaranda committed
289 290 291 292 293 294 295 296
void OpenGLCanvas::initializeGL(){
    glShadeModel(GL_SMOOTH);
    glClearColor(1.0f,1.0f,1.0f,0.0f);
    glClearDepth(1.0f);
    glEnable(GL_DEPTH_TEST);
    glDepthFunc(GL_LEQUAL);
    glHint(GL_PERSPECTIVE_CORRECTION_HINT,GL_NICEST);

297
#ifdef __APPLE__
Luis Peñaranda's avatar
Luis Peñaranda committed
298
    const char * const progname = "PROJ_ROOT_DIR";
299 300 301 302
#else
    // progname is a file name or a path???
    const char * const progname = (char*)(PROGNAME);
#endif
Luis Peñaranda's avatar
Luis Peñaranda committed
303

304
    fprintf(stderr,"progname=%s\n",progname);
305 306
    read_config_file();
    // If the input file does not exist or was not specified.
307
    struct stat testbuf;
308
    if(stat(input_image_file,&testbuf)||!strcmp(input_image_file,"")){
309 310
        load_image(QFileDialog::getOpenFileName(this,tr("Choose Panorama File")).toStdString().c_str());
    }else{
311
        load_image(input_image_file);
312
    }
313
    free(input_image_file);
Luis Peñaranda's avatar
Luis Peñaranda committed
314 315 316 317 318 319 320 321 322 323 324

    // mesh resolution
    int m,n;
    m = n = 100;

    //defining texture coordinates
    int meshNumTexCoord = m*n;
    float *texCoord = (float *)malloc(2*meshNumTexCoord*sizeof(float));
    if (texCoord == NULL){
        printf("problem allocating memory for texture coordinates \n");
    }
Luis Peñaranda's avatar
Luis Peñaranda committed
325
    define_texture_coordinates(texCoord, m, n, -CONST_PI_2_F, CONST_PI_2_F, -CONST_PI_F, CONST_PI_F);
Luis Peñaranda's avatar
Luis Peñaranda committed
326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357

    //defining positions of the sphere vertices
    int meshNumVertices = m*n;
    float* positions = (float *)malloc(3*meshNumVertices*sizeof(float));
    if (positions == NULL){
        printf("problem allocating memory for positions \n");
    }
//    vertex_transformation(positions, m, n, center_lambda, center_phi, fov_rads, scale); //passar pelo vertex shader
    load_sphere_mesh(positions, m, n); //colocar essa e funcoes para textura e triangulos no initializeGL

    //defining triagle indices
    unsigned int meshNumFaces = 2*(m-1)*(n-1);
    unsigned int meshNumIndices = 3*meshNumFaces;
    unsigned int * indices = (unsigned int *)malloc(meshNumIndices*sizeof(unsigned int));
    define_triangle_indices(indices, m, n);

    // draw setup
    verticesPositions = positions;
    textureCoordinates = texCoord;
    numberOfIndices = meshNumIndices;
    triangleIndices = indices;

    setShaders();
}

void OpenGLCanvas::define_texture_coordinates(float *texCoord, int m, int n, float min_phi, float max_phi, float min_lambda, float max_lambda){

    float delta_lambda = (max_lambda-min_lambda)/(1.0*(n-1));
    float delta_phi = (max_phi-min_phi)/(1.0*(m-1));

    for (int i = 0; i<m; i++){
        for (int j = 0; j<n; j++){
Luis Peñaranda's avatar
Luis Peñaranda committed
358 359
            texCoord[2*(j+i*n)] = (min_lambda+delta_lambda*j)/(2*CONST_PI_F) + 0.5;
            texCoord[2*(j+i*n)+1] = (min_phi+delta_phi*i)/(CONST_PI_F) + 0.5;
Luis Peñaranda's avatar
Luis Peñaranda committed
360 361 362 363 364 365 366
        }
    }

}

void OpenGLCanvas::vertex_transformation(float *positions, int m, int n, float center_lambda, float center_phi, float fov_rads, float scale){

Luis Peñaranda's avatar
Luis Peñaranda committed
367 368 369 370
    float min_lambda = -CONST_PI_F;
    float max_lambda = CONST_PI_F;
    float min_phi = -CONST_PI_2_F;
    float max_phi = CONST_PI_2_F;
Luis Peñaranda's avatar
Luis Peñaranda committed
371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437

    float delta_lambda = (max_lambda-min_lambda)/(1.0*(n-1));
    float delta_phi = (max_phi-min_phi)/(1.0*(m-1));

    float lambda, phi, x, y, z, u, v, r, theta;

    //calculating the extent of the projection for the given FOV
    lambda = fov_rads;
    phi = 0.f;
    // OpenGL: x is the vertical axes pointg downwards, and y is horizontal axes
    y = sin(phi);
    x = -sin(lambda)*cos(phi);
    z = -cos(lambda)*cos(phi);
    u = 2.f*x/(-z+1.f);
    v = 2.f*y/(-z+1.f);
    r = sqrt(u*u+v*v);
    theta = atan2(u,v);
    r *= scale;
    u = -r*sin(theta);
    v = r*cos(theta);
    x = (4.f*u)/(u*u+v*v+4.f);
    y = (4.f*v)/(u*u+v*v+4.f);
    z = (u*u+v*v-4.f)/(u*u+v*v+4.f);
    u = x/(-z);
    v = y/(-z);
    float extent = u;

    for (int i = 0; i<m; i++){
        for (int j = 0; j<n; j++){

            lambda = (min_lambda+delta_lambda*j);
            phi = (min_phi+delta_phi*i);

            // OpenGL: x is the vertical axes pointg downwards, and y is horizontal axes
            y = sin(phi);
            x = -sin(lambda)*cos(phi);
            z = -cos(lambda)*cos(phi);

            //Rotation 1: (-center_lambda)-rotation on the xz-plane
            float x_copy = x;
            x = cos(-center_lambda)*x - sin(-center_lambda)*z;
            y = 1.f*y;
            z = sin(-center_lambda)*x_copy + cos(-center_lambda)*z;

            //Rotation 2: (-center_phi)-rotation on the yz-plane
            float y_copy = y;
            x = 1.f*x;
            y = cos(-center_phi)*y - sin(-center_phi)*z;
            z = sin(-center_phi)*y_copy + cos(-center_phi)*z;


            u = 2.f*x/(-z+1.f);
            v = 2.f*y/(-z+1.f);

            r = sqrt(u*u+v*v);
            theta = atan2(u,v);

            // scaling the complex plane according to scale specified in the interface (relate it to FOV)
            r *= scale;

            u = -r*sin(theta);
            v = r*cos(theta);

            x = (4.f*u)/(u*u+v*v+4.f);
            y = (4.f*v)/(u*u+v*v+4.f);
            z = (u*u+v*v-4.f)/(u*u+v*v+4.f);

Luis Peñaranda's avatar
Luis Peñaranda committed
438 439
            lambda = atan2(x,-z)/CONST_PI_F;
            phi = asin(y)/CONST_PI_2_F;
Luis Peñaranda's avatar
Luis Peñaranda committed
440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468

            u = x/(-z);
            v = y/(-z);

            if (visualization=="Perspective"){
                positions[3*(j+i*n)] = u/extent;
                positions[3*(j+i*n)+1] = v/extent;
                positions[3*(j+i*n)+2] = z;
            }

            if (visualization=="3D Sphere"){
                positions[3*(j+i*n)] = 0.9f*x;
                positions[3*(j+i*n)+1] = 0.9f*y;
                positions[3*(j+i*n)+2] = z;
            }

            if (visualization=="Equi-Rectangular"){
                positions[3*(j+i*n)] = lambda;
                positions[3*(j+i*n)+1] = phi;
                positions[3*(j+i*n)+2] = z;
            }

        }
    }

}

void OpenGLCanvas::load_sphere_mesh(float *positions, int m, int n){

Luis Peñaranda's avatar
Luis Peñaranda committed
469 470 471 472
    float min_lambda = -CONST_PI_F;
    float max_lambda = CONST_PI_F;
    float min_phi = -CONST_PI_2_F;
    float max_phi = CONST_PI_2_F;
Luis Peñaranda's avatar
Luis Peñaranda committed
473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500

    float delta_lambda = (max_lambda-min_lambda)/(1.0*(n-1));
    float delta_phi = (max_phi-min_phi)/(1.0*(m-1));

    float lambda, phi, x, y, z;

    for (int i = 0; i<m; i++){
        for (int j = 0; j<n; j++){

            lambda = (min_lambda+delta_lambda*j);
            phi = (min_phi+delta_phi*i);

            // OpenGL: x is the vertical axes pointg downwards, and y is horizontal axes
            y = sin(phi);
            x = -sin(lambda)*cos(phi);
            z = -cos(lambda)*cos(phi);

            positions[3*(j+i*n)] = x;
            positions[3*(j+i*n)+1] = y;
            positions[3*(j+i*n)+2] = z;

        }
    }

}

float OpenGLCanvas::calculate_extent(float fov_rads){

Luis Peñaranda's avatar
Luis Peñaranda committed
501
    double lambda, phi, x, y, z, u, v, r, theta;
Luis Peñaranda's avatar
Luis Peñaranda committed
502 503
    //calculating the extent of the projection for the given FOV
    lambda = fov_rads;
Luis Peñaranda's avatar
Luis Peñaranda committed
504
    phi = 0.;
Luis Peñaranda's avatar
Luis Peñaranda committed
505 506 507 508
    // OpenGL: x is the vertical axes pointg downwards, and y is horizontal axes
    y = sin(phi);
    x = -sin(lambda)*cos(phi);
    z = -cos(lambda)*cos(phi);
Luis Peñaranda's avatar
Luis Peñaranda committed
509 510
    u = 2.*x/(-z+1.);
    v = 2.*y/(-z+1.);
Luis Peñaranda's avatar
Luis Peñaranda committed
511 512 513 514 515
    r = sqrt(u*u+v*v);
    theta = atan2(u,v);
    r *= scale;
    u = -r*sin(theta);
    v = r*cos(theta);
Luis Peñaranda's avatar
Luis Peñaranda committed
516 517 518
    x = (4.*u)/(u*u+v*v+4.);
    y = (4.*v)/(u*u+v*v+4.);
    z = (u*u+v*v-4.)/(u*u+v*v+4.);
Luis Peñaranda's avatar
Luis Peñaranda committed
519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546
    u = x/(-z);
    v = y/(-z);
    return u;
}

void OpenGLCanvas::define_triangle_indices(unsigned int * indices, int m, int n){

    for (int i = 0; i<m-1; i++){
        for (int j = 0; j<n-1; j++){

            unsigned int index = (j+i*n);

            indices[3*(2*(j+i*(n-1)))] = index;
            indices[3*(2*(j+i*(n-1)))+1] = index+1;
            indices[3*(2*(j+i*(n-1)))+2] = index+n;

            indices[3*(2*(j+i*(n-1))+1)] = index+1;
            indices[3*(2*(j+i*(n-1))+1)+1] = index+n+1;
            indices[3*(2*(j+i*(n-1))+1)+2] = index+n;

        }
    }

}

int OpenGLCanvas::getTextureSize(const char * const progname, const char * texturePath)
{
    struct pam inpam;
547 548 549 550 551 552
    pm_init(progname, 0);
    FILE * in_file = fopen(texturePath,"r");
    if (in_file==NULL){
        fprintf(stderr,"ERROR in getTextureSize: unable to open specified file\n");
        return -1;
    }
Luis Peñaranda's avatar
Luis Peñaranda committed
553

554 555 556 557 558
#ifdef PAM_STRUCT_SIZE
    pnm_readpaminit(in_file,&inpam,PAM_STRUCT_SIZE(tuple_type));
#else
    pnm_readpaminit(in_file,&inpam,sizeof(struct pam));
#endif
Luis Peñaranda's avatar
Luis Peñaranda committed
559

Luis Peñaranda's avatar
Luis Peñaranda committed
560 561 562
    image_size_x=inpam.width;
    image_size_y=inpam.height;
    int size = image_size_x*image_size_y*inpam.depth*inpam.bytes_per_sample;
563
    pm_close(in_file);
Luis Peñaranda's avatar
Luis Peñaranda committed
564

565 566
    //fprintf(stderr,"size=%d\n",size);
    return size;
Luis Peñaranda's avatar
Luis Peñaranda committed
567 568 569 570 571 572 573 574 575 576 577 578 579 580 581
}

void OpenGLCanvas::readTextureBytes(const char * const progname,
                                          const char * texturePath,
                                          unsigned char * textureBytes,
                                          int * outImageWidth,
                                          int * outImageHeight)
{
        struct pam inpam;
        tuple * tuplerow;
        int row;

        pm_init(progname, 0);
        FILE * in_file = fopen(texturePath, "r");

582 583 584 585 586
#ifdef PAM_STRUCT_SIZE
        pnm_readpaminit(in_file,&inpam,PAM_STRUCT_SIZE(tuple_type));
#else
        pnm_readpaminit(in_file,&inpam,sizeof(struct pam));
#endif
Luis Peñaranda's avatar
Luis Peñaranda committed
587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609

        tuplerow = pnm_allocpamrow(&inpam);

        for (row = 0; row < inpam.height; row++) {
                int column;
                pnm_readpamrow(&inpam, tuplerow);
                for (column = 0; column < inpam.width; ++column) {
                        unsigned int plane;
                        for (plane = 0; plane < inpam.depth; ++plane) {
                                textureBytes[(inpam.height-row-1)*3*inpam.width+3*column+plane] = tuplerow[column][plane];
                        }
                }
        }

        pnm_freepamrow(tuplerow);

        *outImageWidth = inpam.width;
        *outImageHeight = inpam.height;

        pm_close(in_file);
}

void OpenGLCanvas::resizeGL(int w, int h){
610 611 612 613
    if(w>h)
        glViewport(0,(h-w)/2,w,w);
    else
        glViewport((w-h)/2,0,h,h);
Luis Peñaranda's avatar
Luis Peñaranda committed
614 615 616 617 618 619 620
}

char * OpenGLCanvas::textFileRead(char *fn) {

    FILE *fp;
    char *content = NULL;
    int f, count;
621 622
    f = OPEN_FILE(fn, O_RDONLY);
    count = LSEEK_FD(f, 0, SEEK_END);
Luis Peñaranda's avatar
Luis Peñaranda committed
623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641
//    close(f);
    if (fn != NULL) {
        fp = fopen(fn,"rt");
        if (fp != NULL) {
            if (count > 0) {
                content = (char *)malloc(sizeof(char) * (count+1));
                count = fread(content,sizeof(char),count,fp);
                content[count] = '\0';
            }
            fclose(fp);
        }
    }
    return content;
}

void OpenGLCanvas::setShaders() {

    char *vs,*fs;

Luis Peñaranda's avatar
Luis Peñaranda committed
642 643
#ifndef __APPLE__
  #ifdef GLEW_VERSION_1_5
644 645 646 647 648
    GLenum err=glewInit();
    if(err!=GLEW_OK){
        fprintf(stderr,"error in GLEW initialization: %s\n",glewGetString(err));
        exit(-1);
    }
Luis Peñaranda's avatar
Luis Peñaranda committed
649
  #endif
650 651
#endif

Luis Peñaranda's avatar
Luis Peñaranda committed
652 653 654
    GLuint v = glCreateShader(GL_VERTEX_SHADER);
    GLuint f = glCreateShader(GL_FRAGMENT_SHADER);

655
    // Configure vertex and fragment shader files.
656 657
    char *vs_file=(char*)malloc(512*sizeof(char*));
    char *fs_file=(char*)malloc(512*sizeof(char*));
658 659 660 661 662 663 664 665 666 667 668 669 670 671
    if(!strcmp(shader_dir,"")){ // if shader_dir was not configured
        if(!GET_WORKDIR(vs_file,512)||!GET_WORKDIR(fs_file,512)){
            fprintf(stderr,"error reading shader files\n");
            exit(-1);
        }
        strcat(vs_file,"/shaders/");
        strcat(fs_file,"/shaders/");
    }else{;
        strcpy(vs_file,shader_dir);
        strcat(vs_file,"/");
        strcpy(fs_file,shader_dir);
        strcat(fs_file,"/");
    }
    strcat(vs_file,VERT_SHADER_FILE);
672
    strcat(fs_file,FRAG_SHADER_FILE);
673
    fprintf(stderr,"vs_file=%s\nfs_file=%s\n",vs_file,fs_file);
674 675 676 677 678 679 680 681

    struct stat vs_testbuf,fs_testbuf;
    if(stat(vs_file,&vs_testbuf)||stat(fs_file,&fs_testbuf)){
        fprintf(stderr,"a shader file does not exist!\n");
        free(vs_file);
        free(fs_file);
        exit(-1);
    }
Luis Peñaranda's avatar
Luis Peñaranda committed
682

683 684
    vs=textFileRead(vs_file);
    fs=textFileRead(fs_file);
Luis Peñaranda's avatar
Luis Peñaranda committed
685 686 687 688 689 690 691 692

    const char * vv = vs;
    const char * ff = fs;

    glShaderSource(v, 1, &vv,NULL);
    glShaderSource(f, 1, &ff,NULL);

    free(vs);free(fs);
693
    free(vs_file);free(fs_file);
Luis Peñaranda's avatar
Luis Peñaranda committed
694 695 696 697 698 699 700 701 702 703 704 705 706 707

    glCompileShader(v);
    glCompileShader(f);

    GLuint p = glCreateProgram();

    glAttachShader(p,v);
    glAttachShader(p,f);

    glLinkProgram(p);
    glUseProgram(p);

}

Luis Peñaranda's avatar
Luis Peñaranda committed
708 709 710 711 712 713 714 715 716
void OpenGLCanvas::mousePressEvent(QMouseEvent *event){
    lastPos=event->pos();
    //fprintf(stderr,"mouse click\n");
}

void OpenGLCanvas::mouseMoveEvent(QMouseEvent *event){
    // scroll with the left button
    if(event->buttons()==Qt::LeftButton){
        // compute the delta and move the image
Luis Peñaranda's avatar
Luis Peñaranda committed
717 718
        center_lambda+=(event->x()-lastPos.x())*CONST_PI_F/image_size_x;
        center_phi+=(event->y()-lastPos.y())*CONST_PI_F/image_size_y;
Luis Peñaranda's avatar
Luis Peñaranda committed
719 720 721 722 723
        lastPos=event->pos();
        updateGL();
    }
}

724 725
void OpenGLCanvas::wheelEvent(QWheelEvent *event){
    if(event->orientation()==Qt::Vertical){
726
        if(event->modifiers()==Qt::ShiftModifier){
727 728
            change_fov_max(fov_max+((double)event->delta())/30);
        }else{
729 730 731 732 733 734 735 736 737 738 739
            int new_fov=fov+event->delta()/30;
            change_fov((double)new_fov);
            if(auto_fov_max){
                if(new_fov<60)
                    change_fov_max(60);
                else
                    if(new_fov>180)
                        change_fov_max(1);
                    else
                        change_fov_max(90-new_fov/2);
            }
740
        }
741 742 743
    }
}

Luis Peñaranda's avatar
Luis Peñaranda committed
744 745
void OpenGLCanvas::paintGL(){

Luis Peñaranda's avatar
Luis Peñaranda committed
746
    float fov_rads = (fov/360.)*CONST_PI;
Luis Peñaranda's avatar
Luis Peñaranda committed
747 748 749 750 751 752 753

//    // changing scale to generate the figures for the paper (remove it after)
//    scale = 0.8;


    // defining transformation parameters (that will be passed to the vertex shader)
    float extent = calculate_extent(fov_rads);
Luis Penaranda's avatar
Luis Penaranda committed
754
    float vis_mode=.0;
Luis Peñaranda's avatar
Luis Peñaranda committed
755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790
    if (visualization=="Perspective") vis_mode=1.0;
    else if (visualization=="3D Sphere") vis_mode=2.0;
    else if (visualization=="Equi-Rectangular") vis_mode=3.0;
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glOrtho(0.0, 2.0/extent, 0.0, 2.0/scale, 0.0, -2.0/vis_mode);

    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
    glOrtho(0.0, 2.0/center_lambda, 0.0, 2.0/center_phi, -1.0, 1.0);

    // drawing the mesh
    glClearColor(1.0, 1.0, 1.0, 1.0);

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glEnable(GL_TEXTURE_2D);
    glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);

    glColor3f(1, 0, 0);

    glEnableClientState(GL_VERTEX_ARRAY);
    glVertexPointer(3, GL_FLOAT, 0, verticesPositions);
    glEnableClientState(GL_TEXTURE_COORD_ARRAY);
    glTexCoordPointer(2, GL_FLOAT, 0, textureCoordinates);

    glDrawElements(GL_TRIANGLES, numberOfIndices, GL_UNSIGNED_INT, triangleIndices);
    glDisableClientState(GL_TEXTURE_COORD_ARRAY);
    glDisableClientState(GL_VERTEX_ARRAY);

    time_frames++;
//    if (time_frames > 0) {
        double dt = time_time.elapsed();
//        if (dt > 0.5) {
            time_fps = time_frames/dt;
            time_frames = 0;
            time_time.reset();
Luis Peñaranda's avatar
Luis Peñaranda committed
791 792
            emit fps(QString("%1 fps").arg((int)(time_fps+0.5)));
            //printf("fps = %d ", (int)(time_fps+0.5));
Luis Peñaranda's avatar
Luis Peñaranda committed
793 794 795 796
//        }
//    }

}