OpenGL Texture

#include <GL/gl.h>
#include <GL/glu.h>
#include <GL/glut.h>
#include <stdlib.h>
#include <stdio.h>

/*  Create checkerboard texture  */
#define checkImageWidth 64
#define checkImageHeight 64
static GLubyte checkImage[checkImageHeight][checkImageWidth][4];

static GLuint texName;
GLfloat _angle=45;
void makeCheckImage(void)
{
   int i, j, c;
   for (i = 0; i < checkImageHeight; i++) {
      for (j = 0; j < checkImageWidth; j++) {
         //c = ((((i&0x8)==0)^((j&0x8))==0))*255; //checks
        // c=((((i&0X15)==0)^((j&0x15))==0))*120;//border
        //c=((((i&0X2)==0)^((j&0x2))==0))*200; //more checks
         c=((((i&0x22)==0)^((j&0x22))==0))*200; //flag
         checkImage[i][j][0] = (GLubyte) c;
         checkImage[i][j][1] = (GLubyte) c;
         checkImage[i][j][2] = (GLubyte) c;
         checkImage[i][j][3] = (GLubyte) 200;
      }
   }
}

void init(void)
{
   glClearColor (0.0, 0.0, 0.0, 0.0);
   glShadeModel(GL_FLAT);
   glEnable(GL_DEPTH_TEST);

   makeCheckImage();
   glPixelStorei(GL_UNPACK_ALIGNMENT, 1);

   glGenTextures(1, &texName);
   glBindTexture(GL_TEXTURE_2D, texName);

   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_MAG_FILTER,
                   GL_NEAREST);
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
                   GL_NEAREST);
   glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, checkImageWidth,
                checkImageHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                checkImage);
}

void display(void)
{
   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
   glEnable(GL_TEXTURE_2D);
   glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
   glBindTexture(GL_TEXTURE_2D, texName);
   glLoadIdentity();
glTranslatef(0.0f, 0.0f, -5.0f);
glRotatef(_angle, 1.0f,0.0f, 0.0f);
  glBegin(GL_QUADS);
    glColor3f(0.0f, 1.0f, 0.0f);     // Green
    glTexCoord2f(0.0, 0.0);glVertex3f( 1.0f, 1.0f, -1.0f);
     glTexCoord2f(0.0, 1.0); glVertex3f(-1.0f, 1.0f, -1.0f);
      glTexCoord2f(1.0, 1.0);glVertex3f(-1.0f, 1.0f,  1.0f);
      glTexCoord2f(1.0, 0.0);glVertex3f( 1.0f, 1.0f,  1.0f);

     glColor3f(1.0f, 1.0f, 0.0f);     // Yellow
     glTexCoord2f(0.0, 0.0); glVertex3f( 1.0f, -1.0f,  1.0f);
     glTexCoord2f(0.0, 1.0); glVertex3f(-1.0f, -1.0f,  1.0f);
     glTexCoord2f(1.0, 1.0); glVertex3f(-1.0f, -1.0f, -1.0f);
     glTexCoord2f(1.0, 0.0); glVertex3f( 1.0f, -1.0f, -1.0f);

      // Front face  (z = 1.0f)
      glColor3f(1.0f, 0.0f, 0.0f);     // Red
      glTexCoord2f(0.0, 0.0);glVertex3f( 1.0f,  1.0f, 1.0f);
      glTexCoord2f(0.0, 1.0);glVertex3f(-1.0f,  1.0f, 1.0f);
      glTexCoord2f(1.0, 1.0);glVertex3f(-1.0f, -1.0f, 1.0f);
      glTexCoord2f(1.0, 0.0);glVertex3f( 1.0f, -1.0f, 1.0f);

      // Back face (z = -1.0f)
      glColor3f(1.0f, 1.0f, 1.0f);     // Yellow
      glTexCoord2f(0.0, 0.0);glVertex3f( 1.0f, -1.0f, -1.0f);
      glTexCoord2f(0.0, 1.0);glVertex3f(-1.0f, -1.0f, -1.0f);
      glTexCoord2f(1.0, 1.0);glVertex3f(-1.0f,  1.0f, -1.0f);
      glTexCoord2f(1.0, 0.0);glVertex3f( 1.0f,  1.0f, -1.0f);

      // Left face (x = -1.0f)
      glColor3f(0.0f, 0.0f, 1.0f);     // Blue
      glTexCoord2f(0.0, 0.0);glVertex3f(-1.0f,  1.0f,  1.0f);
      glTexCoord2f(0.0, 1.0);glVertex3f(-1.0f,  1.0f, -1.0f);
      glTexCoord2f(1.0, 1.0);glVertex3f(-1.0f, -1.0f, -1.0f);
      glTexCoord2f(1.0, 0.0);glVertex3f(-1.0f, -1.0f,  1.0f);

      // Right face (x = 1.0f)
      glColor3f(1.0f, 0.0f, 1.0f);     // Magenta
      glTexCoord2f(0.0, 0.0);glVertex3f(1.0f,  1.0f, -1.0f);
      glTexCoord2f(0.0, 1.0);glVertex3f(1.0f,  1.0f,  1.0f);
      glTexCoord2f(1.0, 1.0);glVertex3f(1.0f, -1.0f,  1.0f);
     glTexCoord2f(1.0, 0.0); glVertex3f(1.0f, -1.0f, -1.0f);

  glEnd();
   glFlush();
   glDisable(GL_TEXTURE_2D);
}

void reshape(int w, int h)
{
   glViewport(0, 0, (GLsizei) w, (GLsizei) h);
   glMatrixMode(GL_PROJECTION);
   glLoadIdentity();
   gluPerspective(60.0, (GLfloat) w/(GLfloat) h, 1.0, 30.0);
   glMatrixMode(GL_MODELVIEW);
   glLoadIdentity();
   glTranslatef(0.0, 0.0, -3.6);
}

void update(int value) {
_angle += 1.5f;
if (_angle > 360) {
_angle -= 360;
}
glutPostRedisplay();
glutTimerFunc(25, update,0);
}

int main(int argc, char** argv)
{
   glutInit(&argc, argv);
   glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);
   glutInitWindowSize(250, 250);
   glutInitWindowPosition(100, 100);
   glutCreateWindow(argv[0]);
   init();
   glutDisplayFunc(display);
   glutReshapeFunc(reshape);
   glutTimerFunc(25, update, 0);
   glutMainLoop();
   return 0;
}

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