#include <GL/glut.h>

#define	checkImageWidth 64
#define	checkImageHeight 64

GLubyte checkImage[checkImageWidth][checkImageHeight][3];

void makeCheckImage()
	{
	int i, j, c;

	for (i = 0; i < checkImageWidth; i++) 
		{
		for (j = 0; j < checkImageHeight; j++) 
			{
			c = ((((i & 8) == 0) ^ ((j & 8) == 0))) * 255;
			checkImage[i][j][0] = (GLubyte) c;
			checkImage[i][j][1] = (GLubyte) c;
			checkImage[i][j][2] = (GLubyte) c;
			}
		}
	}

void textureinit()
	{	    
	glClearColor (0.0, 0.0, 0.0, 0.0);
	
	makeCheckImage();
	
	glTexImage2D(GL_TEXTURE_2D, 0, 3, checkImageWidth, 
	
	checkImageHeight, 0, GL_RGB, GL_UNSIGNED_BYTE, &checkImage[0][0][0]);
	
	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
	
	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
	
	glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
	
	glEnable(GL_TEXTURE_2D);
	}

void display(void)
	{
	glClear(GL_COLOR_BUFFER_BIT);

	glBegin(GL_QUADS);
		glTexCoord2f(0.0, 0.0); glVertex3f(-2.0, -1.0, 0.0);
		glTexCoord2f(0.0, 1.0); glVertex3f(-2.0, 1.0, 0.0);
		glTexCoord2f(1.0, 1.0); glVertex3f(0.0, 1.0, 0.0);
		glTexCoord2f(1.0, 0.0); glVertex3f(0.0, -1.0, 0.0);

		glTexCoord2f(0.0, 0.0); glVertex3f(1.0, -1.0, 0.0);
		glTexCoord2f(0.0, 1.0); glVertex3f(1.0, 1.0, 0.0);
		glTexCoord2f(1.0, 1.0); glVertex3f(2.41421, 1.0, -1.41421);
		glTexCoord2f(1.0, 0.0); glVertex3f(2.41421, -1.0, -1.41421);
	glEnd();
	
	glFinish();
	}

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

int main(int argc, char** argv)
	{
	glutInit(&argc, argv);
	glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
	glutCreateWindow("simple texture");
	textureinit();
	glutReshapeFunc (myReshape);
	glutDisplayFunc(display);
	glutMainLoop();
	return 0;            
	}
