openglcanvas.cpp 23.8 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 17
  #include <direct.h>
  #define GET_WORKDIR _getcwd
#else
18
  // unistd was included above
19 20
  #define GET_WORKDIR getcwd
#endif
Luis Peñaranda's avatar
Luis Peñaranda committed
21 22

#define PROGNAME "pano_interface"
23 24
#define VERT_SHADER_FILE "test_vertex_shader.vert"
#define FRAG_SHADER_FILE "fragment_shader.frag"
Luis Peñaranda's avatar
Luis Peñaranda committed
25

26 27 28 29 30 31 32 33
#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
34

Luis Peñaranda's avatar
Luis Peñaranda committed
35 36 37 38 39
OpenGLCanvas::OpenGLCanvas(QWidget *parent) :
    QGLWidget(parent)
{
    setFormat(QGL::DoubleBuffer | QGL::DepthBuffer);
    fov = 60.f;
Luis Peñaranda's avatar
Luis Peñaranda committed
40
    fov_max = 60.f; // TODO: I only use floats here because Leo did... check
Luis Peñaranda's avatar
Luis Peñaranda committed
41 42 43 44 45
    scale = 1.0f;
    center_lambda = 0.f;
    center_phi = 0.f;
    fov_scale_relation = "Square Root";
    visualization = "Perspective";
46
    auto_fov_max=false;
Luis Peñaranda's avatar
Luis Peñaranda committed
47 48 49 50 51 52 53 54 55 56 57 58 59

    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
60 61 62 63
    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
64 65
    //else if (fov>295.f)
    //    scale = 0.02f; // TODO: check this value wrt fov_max
Luis Peñaranda's avatar
Luis Peñaranda committed
66
    else {
Luis Peñaranda's avatar
Luis Peñaranda committed
67 68 69 70 71 72 73 74 75 76 77 78
        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
79 80 81 82
    }

//    scale = 0.3f;

Luis Peñaranda's avatar
Luis Peñaranda committed
83
    fprintf(stderr,"change fov, fov=%f, fov_max=%f, scale=%f\n",fov,fov_max,scale);
84
    emit fov_changed((int)fov);
Luis Peñaranda's avatar
Luis Peñaranda committed
85

Luis Peñaranda's avatar
Luis Peñaranda committed
86 87 88 89
    updateGL();

}

90
void OpenGLCanvas::change_fov(int new_fov){
Luis Peñaranda's avatar
Luis Peñaranda committed
91 92
    if(new_fov<=360&&new_fov>=1)
            change_fov((double)new_fov);
93 94 95 96 97 98 99 100 101
    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);
    }
102 103 104
}

void OpenGLCanvas::change_fov_max(int new_fov_max){
Luis Peñaranda's avatar
Luis Peñaranda committed
105
    if(new_fov_max<=360&&new_fov_max>=1)
Luis Peñaranda's avatar
Luis Peñaranda committed
106
            fov_max=(double)new_fov_max;
107 108
    if (fov<=fov_max)
        scale=1.f;
Luis Peñaranda's avatar
Luis Peñaranda committed
109 110
    //else if (fov>295.f)
    //    scale = 0.02f; // TODO: check this value wrt fov_max
111 112 113 114 115 116 117 118 119 120 121 122 123 124
    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
125
    fprintf(stderr,"change fov_max, fov=%f, fov_max=%f, new scale=%f\n",fov,fov_max,scale);
126
    emit max_fov_changed((int)fov_max);
Luis Peñaranda's avatar
Luis Peñaranda committed
127 128 129
    updateGL();
}

Luis Peñaranda's avatar
Luis Peñaranda committed
130 131 132 133 134 135 136 137 138
//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
139
    if (center_lambda!=lambda && lambda>=-CONST_PI && lambda<=CONST_PI) {
Luis Peñaranda's avatar
Luis Peñaranda committed
140 141 142 143 144 145 146 147
        center_lambda = lambda;
        updateGL();
    }

}

void OpenGLCanvas::change_center_phi(double phi){

Luis Peñaranda's avatar
Luis Peñaranda committed
148
    if (center_phi!=phi && phi>=-CONST_PI_2 && phi<=CONST_PI_2) {
Luis Peñaranda's avatar
Luis Peñaranda committed
149 150 151 152 153 154
        center_phi = phi;
        updateGL();
    }

}

Luis Peñaranda's avatar
Luis Peñaranda committed
155 156 157 158 159 160
void OpenGLCanvas::re_center(){
    center_phi=.0f;
    center_lambda=.0f;
    updateGL();
}

Luis Peñaranda's avatar
Luis Peñaranda committed
161 162 163
void OpenGLCanvas::change_fov_scale_relation(QString name){

   fov_scale_relation = name;
Luis Peñaranda's avatar
Luis Peñaranda committed
164 165
   if (fov<fov_max) scale = 1.f;
   //else if (fov>295.f) scale = 0.01f;
Luis Peñaranda's avatar
Luis Peñaranda committed
166
   else{
Luis Peñaranda's avatar
Luis Peñaranda committed
167 168 169 170 171 172 173 174 175 176 177 178
       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
179
   }
180
   fprintf(stderr,"changed scale relation, scale=%f, fov_max=%f\n",scale,fov_max);
Luis Peñaranda's avatar
Luis Peñaranda committed
181 182 183 184 185 186 187
   updateGL();

}

void OpenGLCanvas::change_visualization(QString name){

    visualization = name;
188
    updateGL();
Luis Peñaranda's avatar
Luis Peñaranda committed
189 190 191

}

192 193 194 195
// This function reads the contents of the ~/.panorc file and stores the
// options in private variables.
// TODO: windows
void OpenGLCanvas::read_config_file(){
196 197 198 199 200 201 202 203 204
#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
205 206 207
    struct passwd *pw=getpwuid(getuid());
    char *filepath=pw->pw_dir;
    strcat(filepath,"/.panorc");
208 209
#endif
    fprintf(stderr,"the user config file is %s\n",filepath);
210 211 212 213
    shader_dir=(char*)malloc(512*sizeof(char));
    shader_dir[0]='\0';
    input_image_file=(char*)malloc(512*sizeof(char));
    input_image_file[0]='\0';
214
    char *read_line=(char*)malloc(64*sizeof(char));
215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243
    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
244 245
            // check for 'max_fov' option
            if(!strncmp(line,"max_fov=",8)){
246 247 248
                strcpy(read_line,line+8);
                read_line[strlen(line)-9]='\0';
                fov_max=atof(read_line);
Luis Peñaranda's avatar
Luis Peñaranda committed
249 250
                fprintf(stderr,"max_fov=%f\n",fov_max);
            }
251 252 253 254 255 256 257
            // 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);
            }
258 259 260
        }
        fclose(rcfile);
    }
Luis Peñaranda's avatar
Luis Peñaranda committed
261 262
    emit fov_changed((int)fov);
    emit max_fov_changed((int)fov_max);
263 264
}

265 266 267 268 269 270 271 272 273 274 275 276 277 278 279
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);
}

280
void OpenGLCanvas::change_input_image(){
281
    load_image(QFileDialog::getOpenFileName(this,tr("Choose Panorama File")).toStdString().c_str());
282 283 284
    updateGL();
}

Luis Peñaranda's avatar
Luis Peñaranda committed
285 286 287 288 289 290 291 292
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);

293
#ifdef __APPLE__
Luis Peñaranda's avatar
Luis Peñaranda committed
294
    const char * const progname = "PROJ_ROOT_DIR";
295 296 297 298
#else
    // progname is a file name or a path???
    const char * const progname = (char*)(PROGNAME);
#endif
Luis Peñaranda's avatar
Luis Peñaranda committed
299

300
    fprintf(stderr,"progname=%s\n",progname);
301 302
    read_config_file();
    // If the input file does not exist or was not specified.
303
    struct stat testbuf;
304
    if(stat(input_image_file,&testbuf)||!strcmp(input_image_file,"")){
305 306
        load_image(QFileDialog::getOpenFileName(this,tr("Choose Panorama File")).toStdString().c_str());
    }else{
307
        load_image(input_image_file);
308
    }
309
    free(input_image_file);
Luis Peñaranda's avatar
Luis Peñaranda committed
310 311 312 313 314 315 316 317 318 319 320

    // 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
321
    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
322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353

    //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
354 355
            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
356 357 358 359 360 361 362
        }
    }

}

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
363 364 365 366
    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
367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433

    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
434 435
            lambda = atan2(x,-z)/CONST_PI_F;
            phi = asin(y)/CONST_PI_2_F;
Luis Peñaranda's avatar
Luis Peñaranda committed
436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464

            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
465 466 467 468
    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
469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496

    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
497
    double lambda, phi, x, y, z, u, v, r, theta;
Luis Peñaranda's avatar
Luis Peñaranda committed
498 499
    //calculating the extent of the projection for the given FOV
    lambda = fov_rads;
Luis Peñaranda's avatar
Luis Peñaranda committed
500
    phi = 0.;
Luis Peñaranda's avatar
Luis Peñaranda committed
501 502 503 504
    // 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
505 506
    u = 2.*x/(-z+1.);
    v = 2.*y/(-z+1.);
Luis Peñaranda's avatar
Luis Peñaranda committed
507 508 509 510 511
    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
512 513 514
    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
515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542
    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;
543 544 545 546 547 548
    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
549

550 551 552 553 554
#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
555

Luis Peñaranda's avatar
Luis Peñaranda committed
556 557 558
    image_size_x=inpam.width;
    image_size_y=inpam.height;
    int size = image_size_x*image_size_y*inpam.depth*inpam.bytes_per_sample;
559
    pm_close(in_file);
Luis Peñaranda's avatar
Luis Peñaranda committed
560

561 562
    //fprintf(stderr,"size=%d\n",size);
    return size;
Luis Peñaranda's avatar
Luis Peñaranda committed
563 564 565 566 567 568 569 570 571 572 573 574 575 576 577
}

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");

578 579 580 581 582
#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
583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605

        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){
606 607 608 609
    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
610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637
}

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

    FILE *fp;
    char *content = NULL;
    int f, count;
    f = open(fn, O_RDONLY);
    count = lseek(f, 0, SEEK_END);
//    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
638 639
#ifndef __APPLE__
  #ifdef GLEW_VERSION_1_5
640 641 642 643 644
    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
645
  #endif
646 647
#endif

Luis Peñaranda's avatar
Luis Peñaranda committed
648 649 650
    GLuint v = glCreateShader(GL_VERTEX_SHADER);
    GLuint f = glCreateShader(GL_FRAGMENT_SHADER);

651
    // Configure vertex and fragment shader files.
652 653
    char *vs_file=(char*)malloc(512*sizeof(char*));
    char *fs_file=(char*)malloc(512*sizeof(char*));
654 655 656 657 658 659 660 661 662 663 664 665 666 667
    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);
668
    strcat(fs_file,FRAG_SHADER_FILE);
669
    fprintf(stderr,"vs_file=%s\nfs_file=%s\n",vs_file,fs_file);
670 671 672 673 674 675 676 677

    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
678

679 680
    vs=textFileRead(vs_file);
    fs=textFileRead(fs_file);
Luis Peñaranda's avatar
Luis Peñaranda committed
681 682 683 684 685 686 687 688

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

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

    free(vs);free(fs);
689
    free(vs_file);free(fs_file);
Luis Peñaranda's avatar
Luis Peñaranda committed
690 691 692 693 694 695 696 697 698 699 700 701 702 703

    glCompileShader(v);
    glCompileShader(f);

    GLuint p = glCreateProgram();

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

    glLinkProgram(p);
    glUseProgram(p);

}

Luis Peñaranda's avatar
Luis Peñaranda committed
704 705 706 707 708 709 710 711 712
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
713 714
        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
715 716 717 718 719
        lastPos=event->pos();
        updateGL();
    }
}

720 721
void OpenGLCanvas::wheelEvent(QWheelEvent *event){
    if(event->orientation()==Qt::Vertical){
722
        if(event->modifiers()==Qt::ShiftModifier){
723 724
            change_fov_max(fov_max+((double)event->delta())/30);
        }else{
725 726 727 728 729 730 731 732 733 734 735
            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);
            }
736
        }
737 738 739
    }
}

Luis Peñaranda's avatar
Luis Peñaranda committed
740 741
void OpenGLCanvas::paintGL(){

Luis Peñaranda's avatar
Luis Peñaranda committed
742
    float fov_rads = (fov/360.)*CONST_PI;
Luis Peñaranda's avatar
Luis Peñaranda committed
743 744 745 746 747 748 749

//    // 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
750
    float vis_mode=.0;
Luis Peñaranda's avatar
Luis Peñaranda committed
751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786
    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
787 788
            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
789 790 791 792
//        }
//    }

}