Newer
Older
#include <unistd.h> // for getcwd, getpwuid, getuid
#include <sys/types.h> // for fstat, getpwuid, getuid
#include <sys/stat.h> // for fstat
#include <pwd.h> // for getpwuid (TODO: windows?)
#include <cstdio> // for fopen, fclose, getc
#include <cstring>
#ifdef WINDOWS
#include <direct.h>
#define GET_WORKDIR _getcwd
#else
#define VERT_SHADER_FILE "test_vertex_shader.vert"
#define FRAG_SHADER_FILE "fragment_shader.frag"
#define CONST_PI 3.141592653589793238462
#define CONST_PI_2 1.57079632679489661923
#define CONST_PI_F 3.14159265358979f
#define CONST_PI_2_F 1.570796326794897f // TODO: check this one
OpenGLCanvas::OpenGLCanvas(QWidget *parent) :
QGLWidget(parent)
{
setFormat(QGL::DoubleBuffer | QGL::DepthBuffer);
fov = 60.f;
fov_max = 60.f; // TODO: I only use floats here because Leo did... check
scale = 1.0f;
center_lambda = 0.f;
center_phi = 0.f;
fov_scale_relation = "Square Root";
visualization = "Perspective";
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){
if (fov!=f && f>=1.f && f<=360.f)
fov=f;
if (fov<=fov_max)
scale=1.f;
//else if (fov>295.f)
// scale = 0.02f; // TODO: check this value wrt fov_max
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));
fprintf(stderr,"change fov, fov=%f, fov_max=%f, scale=%f\n",fov,fov_max,scale);
void OpenGLCanvas::change_fov(int new_fov){
if(new_fov<=360&&new_fov>=1)
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);
}
}
void OpenGLCanvas::change_fov_max(int new_fov_max){
if (fov<=fov_max)
scale=1.f;
//else if (fov>295.f)
// scale = 0.02f; // TODO: check this value wrt fov_max
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));
}
fprintf(stderr,"change fov_max, fov=%f, fov_max=%f, new scale=%f\n",fov,fov_max,scale);
//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){
if (center_lambda!=lambda && lambda>=-CONST_PI && lambda<=CONST_PI) {
center_lambda = lambda;
updateGL();
}
}
void OpenGLCanvas::change_center_phi(double phi){
if (center_phi!=phi && phi>=-CONST_PI_2 && phi<=CONST_PI_2) {
void OpenGLCanvas::re_center(){
center_phi=.0f;
center_lambda=.0f;
updateGL();
}
void OpenGLCanvas::change_fov_scale_relation(QString name){
fov_scale_relation = name;
if (fov<fov_max) scale = 1.f;
//else if (fov>295.f) scale = 0.01f;
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));
fprintf(stderr,"changed scale relation, scale=%f, fov_max=%f\n",scale,fov_max);
updateGL();
}
void OpenGLCanvas::change_visualization(QString name){
visualization = name;
// This function reads the contents of the ~/.panorc file and stores the
// options in private variables.
// TODO: windows
void OpenGLCanvas::read_config_file(){
struct passwd *pw=getpwuid(getuid());
char *filepath=pw->pw_dir;
strcat(filepath,"/.panorc");
shader_dir=(char*)malloc(512*sizeof(char));
shader_dir[0]='\0';
input_image_file=(char*)malloc(512*sizeof(char));
input_image_file[0]='\0';
char *read_line=(char*)malloc(64*sizeof(char));
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
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);
}
// check for 'max_fov' option
if(!strncmp(line,"max_fov=",8)){
strcpy(read_line,line+8);
read_line[strlen(line)-9]='\0';
fov_max=atof(read_line);
fprintf(stderr,"max_fov=%f\n",fov_max);
}
// 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);
}
emit fov_changed((int)fov);
emit max_fov_changed((int)fov_max);
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);
}
load_image(QFileDialog::getOpenFileName(this,tr("Choose Panorama File")).toStdString().c_str());
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);
#else
// progname is a file name or a path???
const char * const progname = (char*)(PROGNAME);
#endif
fprintf(stderr,"progname=%s\n",progname);
read_config_file();
// If the input file does not exist or was not specified.
if(stat(input_image_file,&testbuf)||!strcmp(input_image_file,"")){
load_image(QFileDialog::getOpenFileName(this,tr("Choose Panorama File")).toStdString().c_str());
}else{
// 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");
}
define_texture_coordinates(texCoord, m, n, -CONST_PI_2_F, CONST_PI_2_F, -CONST_PI_F, CONST_PI_F);
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
//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++){
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;
}
}
}
void OpenGLCanvas::vertex_transformation(float *positions, int m, int n, float center_lambda, float center_phi, float fov_rads, float scale){
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;
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
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
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);
lambda = atan2(x,-z)/CONST_PI_F;
phi = asin(y)/CONST_PI_2_F;
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
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){
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;
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
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){
//calculating the extent of the projection for the given FOV
lambda = fov_rads;
// 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);
r = sqrt(u*u+v*v);
theta = atan2(u,v);
r *= scale;
u = -r*sin(theta);
v = r*cos(theta);
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.);
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
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;
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;
}
#ifdef PAM_STRUCT_SIZE
pnm_readpaminit(in_file,&inpam,PAM_STRUCT_SIZE(tuple_type));
#else
pnm_readpaminit(in_file,&inpam,sizeof(struct pam));
#endif
image_size_x=inpam.width;
image_size_y=inpam.height;
int size = image_size_x*image_size_y*inpam.depth*inpam.bytes_per_sample;
//fprintf(stderr,"size=%d\n",size);
return size;
}
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");
#ifdef PAM_STRUCT_SIZE
pnm_readpaminit(in_file,&inpam,PAM_STRUCT_SIZE(tuple_type));
#else
pnm_readpaminit(in_file,&inpam,sizeof(struct pam));
#endif
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){
if(w>h)
glViewport(0,(h-w)/2,w,w);
else
glViewport((w-h)/2,0,h,h);
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
}
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;
GLenum err=glewInit();
if(err!=GLEW_OK){
fprintf(stderr,"error in GLEW initialization: %s\n",glewGetString(err));
exit(-1);
}
GLuint v = glCreateShader(GL_VERTEX_SHADER);
GLuint f = glCreateShader(GL_FRAGMENT_SHADER);
// Configure vertex and fragment shader files.
char *vs_file=(char*)malloc(512*sizeof(char*));
char *fs_file=(char*)malloc(512*sizeof(char*));
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);
fprintf(stderr,"vs_file=%s\nfs_file=%s\n",vs_file,fs_file);
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);
}
vs=textFileRead(vs_file);
fs=textFileRead(fs_file);
const char * vv = vs;
const char * ff = fs;
glShaderSource(v, 1, &vv,NULL);
glShaderSource(f, 1, &ff,NULL);
free(vs);free(fs);
glCompileShader(v);
glCompileShader(f);
GLuint p = glCreateProgram();
glAttachShader(p,v);
glAttachShader(p,f);
glLinkProgram(p);
glUseProgram(p);
}
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
center_lambda+=(event->x()-lastPos.x())*CONST_PI_F/image_size_x;
center_phi+=(event->y()-lastPos.y())*CONST_PI_F/image_size_y;
lastPos=event->pos();
updateGL();
}
}
void OpenGLCanvas::wheelEvent(QWheelEvent *event){
if(event->orientation()==Qt::Vertical){
if(event->modifiers()==Qt::ShiftModifier){
change_fov_max(fov_max+((double)event->delta())/30);
}else{
change_fov(fov+((double)event->delta())/30);
}
// // 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);
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
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();
emit fps(QString("%1 fps").arg((int)(time_fps+0.5)));
//printf("fps = %d ", (int)(time_fps+0.5));