Texture doesn't work - OpenGL - c++

Question

I don't know why but my code doesn't run any texture. Can someone tell me how to fix it ?
I'm using a function to load the texture and return the GLuint to a variable and set this variable in the object.
#include <windows.h>
#include <gl/glut.h>
#include <stdlib.h>
#include <stdio.h>
float _angle = 0.0;
int zoomX = 0, zoomY=0;
GLuint texturaGrama;
GLfloat angle, fAspect, rotX, rotY, obsZ;
GLuint LoadTexture( const char * filename, int width, int height ){
GLuint texture;
unsigned char * data;
FILE * file;
file = fopen( filename, "rb" );
if ( file == NULL ) return 0;
data = (unsigned char *)malloc( width * height * 3 );
fread( data, width * height * 3, 1, file );
fclose( file );
for(int i = 0; i < width * height ; ++i)
{
int index = i*3;
unsigned char B,R;
B = data[index];
R = data[index+2];
data[index] = R;
data[index+2] = B;
}
glGenTextures( 1, &texture );
glBindTexture( GL_TEXTURE_2D, texture );
glTexEnvf( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE,GL_MODULATE );
glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,GL_LINEAR_MIPMAP_NEAREST );
glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER,GL_LINEAR );
glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S,GL_REPEAT );
glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T,GL_REPEAT );
gluBuild2DMipmaps( GL_TEXTURE_2D, 3, width, height,GL_RGB, GL_UNSIGNED_BYTE, data );
free( data );
return texture;
}
void Desenha(void)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glEnable(GL_COLOR_MATERIAL);
glEnable(GL_TEXTURE_2D);
// Grama
glPushMatrix();
glColor3f(0.0, 1.0, 0.0);
glTranslatef(0,0,-6);
glRotatef(_angle, 0.0, 1.0, 0.0);
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, texturaGrama);
glBegin(GL_QUADS);
glTexCoord2f(0.0f,0.0f); glVertex3f(-50,-1.5,50);
glTexCoord2f(1.0f,0.0f); glVertex3f(-50,-1.5,-50);
glTexCoord2f(1.0f,1.0f); glVertex3f(50,-1.5,-50);
glTexCoord2f(0.0f,0.0f); glVertex3f(50,-1.5,50);
glEnd();
glDisable(GL_TEXTURE_2D);
}
void PosicionaObservador(void)
{
// Especifica sistema de coordenadas do modelo
glMatrixMode(GL_MODELVIEW);
// Inicializa sistema de coordenadas do modelo
glLoadIdentity();
DefineIluminacao();
// Especifica posição do observador e do alvo
glTranslatef(zoomX,zoomY,-obsZ);
glRotatef(rotX,1,0,0);
glRotatef(rotY,0,1,0);
}
void Inicializa (void)
{
glClearColor(0.0, 0.0, 0.0, 1.0);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-1.0, 1.0, -1.0, 1.0, -1.0, 1.0);
glEnable(GL_COLOR_MATERIAL);
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
glEnable(GL_DEPTH_TEST);
texturaGrama = LoadTexture("grass.bmp", 256, 256);
angle=50;
rotX = 30;
rotY = 0;
obsZ = 10;
}
static void resize(int width, int height)
{
const float ar = (float) width / (float) height;
glViewport(0, 0, width, height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glFrustum(-ar, ar, -1.0, 1.0, 2.0, 100.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
PosicionaObservador();
}
int main(void)
{
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA | GLUT_DEPTH);
glutInitWindowSize(800,600);
glutInitWindowPosition(50,50);
glutCreateWindow("Casa Sinistra");
glutDisplayFunc(Desenha);
glEnable(GL_DEPTH_TEST);
glutSpecialFunc(MovimentoTela);
glutReshapeFunc(resize);
Inicializa();
glutMainLoop();
}
I have tried many other libs but none of them works. I'm running this code in CodeBlocks with Windows 10. The code runs but the texture doesn't appear. It's happening because of Windows ?
I need to add any library?

Answer 1

The GLUT library has to be initilized by glutInit.
Initialize glut at the begin of the program, before you use any instruction of the library:
int main(int argc, char** argv)
{
glutInit(&argc, argv); // <------------
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA | GLUT_DEPTH);
glutInitWindowSize(800,600);
glutInitWindowPosition(50,50);
glutCreateWindow("Casa Sinistra");
.....
Since you are using a double buffered window
glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
you have to call glutSwapBuffers at the end of the rendering loop (last statement in the loop), to perform a buffer swap for the current window:
void Desenha(void)
{
......
glutSwapBuffers();
}
By the way there is a mistake in your texture coordinates, because the uv coordinate (0, 0) is twice (glTexCoord2f(0.0f,0.0f)).