The file is loaded but the texture is not displayed - c++

Question

I'm trying to make a 3D shooter. I think the image is loading because its dimensions are displayed, but it is not displayed as a texture. The program compiles and runs without errors but no texture. I do not know where I am making a mistake.
main.cpp:
#include "Functions.h"
int main(int argc, char** argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
glutInitWindowSize(wnd_width, wnd_height);
glutInitWindowPosition(300, 100);
glEnable(GL_DEPTH_TEST);
glEnable(GL_NORMALIZE);
glutCreateWindow("OpenGL my");
glutDisplayFunc(display);
glutIdleFunc(Idle);
glutSpecialFunc(KeyPressed);
TextureInit();
glutMainLoop();
return 0;
}
functions.h
#define STB_IMAGE_IMPLEMENTATION
#include <GL/glut.h>
#include <stb_image.h>
#include <iostream>
#include "point.h"
#include "camera.h"
int wnd_width=1300;
int wnd_height=900;
GLdouble aspect = wnd_width/wnd_height;
Camera cam;
unsigned int texture;
float text_coords[] = {0,0, 1,0, 1,1, 0,1};
void DrawFloor();
void DrawWall(float x, float width, float height);
void KeyPressed(int key, int x, int y);
void TextureInit();
void display();
void Idle();
void display(){
glClearColor(0.6, 0.8, 1, 1);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(90, aspect, 0.1, 3);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
gluLookAt(cam.pos.x, cam.pos.y, cam.pos.z,
cam.view.x, cam.view.y, cam.view.z,
0, 0.5, 0);
glBegin(GL_QUADS);
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, texture);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glTexCoordPointer(2, GL_FLOAT, 0, text_coords);
//glColor3f(0, 0, 0.7);
DrawFloor();
//glColor3f(0, 0.8, 0.1);
DrawWall(-0.5, 2, 0.7);
DrawWall(0.5, 2, 0.7);
glEnd();
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
glutSwapBuffers();
}
void Idle(){
}
void DrawFloor(){
glVertex3d(1, 0, 2.5);
glVertex3d(1, 0, 0);
glVertex3d(-1, 0, 0);
glVertex3d(-1, 0, 2.5);
}
void DrawWall(float x, float width, float height){
glVertex3f(x, height, 0);
glVertex3f(x, height, width);
glVertex3f(x, 0, width);
glVertex3f(x, 0, 0);
}
void KeyPressed(int key, int x, int y){
switch (key) {
case GLUT_KEY_UP: { cam.MoveForward(); break; }
case GLUT_KEY_DOWN: { cam.MoveBack(); break; }
case GLUT_KEY_LEFT: {cam.TurnLeft(); break; }
case GLUT_KEY_RIGHT: {cam.TurnRight(); break; }
}
cam.PrintPosition();
glutPostRedisplay();
}
void TextureInit(){
int width, height, cnt;
unsigned char* data = stbi_load("whitemarble.jpg", &width, &height, &cnt, 0);
if(data==nullptr) std::cout<< "NO\n";
else std::cout<<width<<'\t'<<height<<'\n';
glGenTextures(1, &texture);
glBindTexture(GL_TEXTURE_2D, texture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height,
0, GL_RGB, GL_UNSIGNED_BYTE, data);
glBindTexture(GL_TEXTURE_2D, 0);
stbi_image_free(data);
}
redone. Now it works. Thanks. But the picture is very stretched.
#define STB_IMAGE_IMPLEMENTATION
#include <GL/glut.h>
#include <stb_image.h>
#include <iostream>
#include "point.h"
#include "camera.h"
int wnd_width=1300;
int wnd_height=900;
GLdouble aspect = wnd_width/wnd_height;
Camera cam;
unsigned int texture;
float text_coords[] = {0,0, 1,0, 1,1, 0,1};
void DrawFloor();
void DrawWall(float x, float width, float height);
void KeyPressed(int key, int x, int y);
void TextureInit();
void display();
void Idle();
void TextureInit(){
int width, height, cnt;
unsigned char* data = stbi_load("whitemarble.jpg", &width, &height, &cnt, 0);
if(data==nullptr) std::cout<< "NO\n";
else std::cout<<width<<'\t'<<height<<'\n';
glGenTextures(1, &texture);
glBindTexture(GL_TEXTURE_2D, texture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
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_RGBA, width, height,
0, GL_RGBA, GL_UNSIGNED_BYTE, data);
glBindTexture(GL_TEXTURE_2D, 0);
stbi_image_free(data);
}
void display(){
glClearColor(0.6, 0.8, 1, 1);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(90, aspect, 0.1, 3);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
gluLookAt(cam.pos.x, cam.pos.y, cam.pos.z,
cam.view.x, cam.view.y, cam.view.z,
0, 0.5, 0);
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, texture);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glBegin(GL_QUADS);
DrawFloor();
DrawWall(-0.5, 2, 0.7);
DrawWall(0.5, 2, 0.7);
glEnd();
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
glutSwapBuffers();
}
void DrawFloor(){
glTexCoord2d(0, 0);
glVertex3d(1, 0, 2.5);
glTexCoord2d(1, 0);
glVertex3d(1, 0, 0);
glTexCoord2d(1, 1);
glVertex3d(-1, 0, 0);
glTexCoord2d(0, 1);
glVertex3d(-1, 0, 2.5);
}
void DrawWall(float x, float width, float height){
glVertex3f(x, height, 0);
glVertex3f(x, height, width);
glVertex3f(x, 0, width);
glVertex3f(x, 0, 0);
}
void KeyPressed(int key, int x, int y){
switch (key) {
case GLUT_KEY_UP: { cam.MoveForward(); break; }
case GLUT_KEY_DOWN: { cam.MoveBack(); break; }
case GLUT_KEY_LEFT: {cam.TurnLeft(); break; }
case GLUT_KEY_RIGHT: {cam.TurnRight(); break; }
}
cam.PrintPosition();
glutPostRedisplay();
}
void Idle(){
}```

Answer 1

Your code is causing several Only a subset of GL commands can be used between glBegin and glEnd. You have to call glBegin immediately before specifying the vertices:
void display(){
glClearColor(0.6, 0.8, 1, 1);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(90, aspect, 0.1, 3);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
gluLookAt(cam.pos.x, cam.pos.y, cam.pos.z,
cam.view.x, cam.view.y, cam.view.z,
0, 0.5, 0);
// glBegin(GL_QUADS); // <--- DELETE
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, texture);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glTexCoordPointer(2, GL_FLOAT, 0, text_coords);
glBegin(GL_QUADS); // <--- INSERT
//glColor3f(0, 0, 0.7);
DrawFloor();
//glColor3f(0, 0.8, 0.1);
DrawWall(-0.5, 2, 0.7);
DrawWall(0.5, 2, 0.7);
glEnd();
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
glutSwapBuffers();
}
You cannot mix fix function attributes and glBegin/glEnd sequences. Use glTexCoord instead:
glTexCoord2d(0, 0);
glVertex3d(1, 0, 2.5);
glTexCoord2d(1, 0);
glVertex3d(1, 0, 0);
glTexCoord2d(1, 1);
glVertex3d(-1, 0, 0);
glTexCoord2d(0, 1);
glVertex3d(-1, 0, 2.5);