#include <GL/glut.h>

GLsizei winWidth = 400, winHeight = 300;
GLubyte texArray [32][32][4];

void init(void)
{
	GLint k, j;
	glClearColor (0, .0, .5, 0.0);

	glMatrixMode (GL_PROJECTION);
	gluOrtho2D (0.0, winWidth, 0.0, winHeight);
	glMatrixMode (GL_MODELVIEW);
	
	for (k = 0; k <= 31; k+=1)
	{
		for (j = 0; j <= 31; j+=1)
		{
			texArray[k][j][0] = 0;
			texArray[k][j][1] = 0;
			texArray[k][j][2] = 0;
			texArray[k][j][3] = 0;
		}
	}

	for (k = 0; k <= 7; k+=2)
	{
		for (j = 0; j <= 31; j+=1)
		{
			texArray[4*k][j][0] = 255;
			texArray[4*k+1][j][0] = 255;
			texArray[4*k+2][j][0] = 255;
			texArray[4*k+3][j][0] = 255;
		}
	}
	glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
    glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
}

void displayFcn (void)
{
    glTexImage2D (GL_TEXTURE_2D, 0, GL_RGBA, 32, 32, 0, GL_RGBA,
                   GL_UNSIGNED_BYTE, texArray);
    glEnable (GL_TEXTURE_2D);

    glClear (GL_COLOR_BUFFER_BIT);
	glBegin (GL_POLYGON);
		glTexCoord2f (0.0, 0.0);  glVertex2i (150,50);
		glTexCoord2f (1.0, 0.0);  glVertex2i (200,50);
		glTexCoord2f (1.0, 1.0);  glVertex2i (200,100);
		glTexCoord2f (0.0, 1.0);  glVertex2i (150,100);
	glEnd ();

	glBegin (GL_POLYGON);
		glTexCoord2f (0.0, 0.0);  glVertex2i (50,50);
		glTexCoord2f (1.0, 0.0);  glVertex2i (100,50);
		glTexCoord2f (0.5, 0.5);  glVertex2i (75,100);
	glEnd ();
	glDisable (GL_TEXTURE_2D);

	glFlush ( ); 
}
void main (int argc, char** argv)
{
	glutInit (&argc, argv);
	glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
	glutInitWindowPosition (400, 0);
	glutInitWindowSize (winWidth, winHeight);
	glutCreateWindow ("Triangle Program");

	init();
	glutDisplayFunc (displayFcn);

	glutMainLoop ( );
}