#include <GL/glut.h> 
#include <stdlib.h> 
#include <stdio.h> 
#define TEX_HEIGHT 16 
#define TEX_WIDTH 16
static GLubyte image[TEX_HEIGHT][TEX_WIDTH][4]; 

void initTexture(void) 
{
 int i, j, c; 
 for (i=0;i<TEX_HEIGHT;i++) {
	for (j=0;j<TEX_WIDTH;j++) {
		if(j==TEX_WIDTH/2){	//中央、縦に、白線
		image[i][j][0]= image[i][j][1]= image[i][j][2]=255;
		image[i][j][3]=255; 
		}	
		else if( (i==TEX_HEIGHT/2) && (j>TEX_WIDTH/2) ){	//中央から右に、青線
		image[i][j][0]=0; image[i][j][1]=0; image[i][j][2]=255;
		image[i][j][3]=255;
		}
		else{	//それ以外は赤
		image[i][j][0]=255; image[i][j][1]=0; image[i][j][2]=0;
		image[i][j][3]=255;
		}
/*
		c = ( ((i&0x01)==0)^((j&0x01)==0) ); 
		image[i][j][0]= image[i][j][1]= image[i][j][2]=c*255; 
		image[i][j][3]=255; 
*/
	} 
   } 
} 

void displayTexPolygon(void) 
{ glEnable(GL_TEXTURE_2D); 
glBegin(GL_QUADS); 
glTexCoord2f(0.0, 0.0); 
glVertex3f(-5.0,-5.0, 0.0); 
glTexCoord2f(0.0, 1.0); 
glVertex3f(-5.0, 5.0, 0.0); 
glTexCoord2f(1.0, 1.0); 
glVertex3f( 5.0, 5.0, 0.0); 
glTexCoord2f(1.0, 0.0); 
glVertex3f( 5.0,-5.0, 0.0); 
glEnd(); 
glDisable(GL_TEXTURE_2D); 
} 

void display(void) 
{ 
static float spin=0.0; 
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT); 
glPushMatrix(); { 
	glTranslatef(0.0, 0.0,-20.0); 
	glRotatef(spin, 0.0, 1.0, 0.0); 
	glColor3f(1.0, 1.0, 1.0); 
	displayTexPolygon();
 } 
spin+=0.1;
 glPopMatrix(); 
glFlush();
 glutSwapBuffers(); 
} 

void init(void) 
{ 
glClearColor(0.0, 0.0, 0.0, 0.0); 
glDepthFunc(GL_LEQUAL); 
glEnable(GL_DEPTH_TEST); 
initTexture(); 
glPixelStorei(GL_UNPACK_ALIGNMENT, 1); 
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, TEX_WIDTH, TEX_HEIGHT, 0, GL_RGBA, GL_UNSIGNED_BYTE, image); 
} 

void reshape(int w, int h) 
{ 
glViewport(0, 0, (GLsizei) w, (GLsizei) h); 
glMatrixMode(GL_PROJECTION); 
glLoadIdentity(); 
glFrustum(-5.0, 5.0,-5.0, 5.0, 5.0, 500.0); 
glMatrixMode(GL_MODELVIEW); 
glLoadIdentity(); 
} 

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