#include <stdlib.h>
#include <GL/glut.h>


// Light
GLfloat light_position[] = {10.0f, 10.0f, 10.0f, 1.0f};
GLfloat diffuse_light[] = {0.9f, 0.9, 0.9f, 0.0f};

GLubyte check_image[64][64][3];
GLubyte static_image[64][64][3];
GLuint check_id, static_id;

void init_check_image() {
	int c;
	for (int i = 0; i < 64; i++) {
	   for (int j = 0; j < 64; j++) {
		c = ((((i&0x8)==0)^((j&0x8))==0))*255;
         	check_image[i][j][0] = (GLubyte) c;
         	check_image[i][j][1] = (GLubyte) c;
         	check_image[i][j][2] = (GLubyte) c;
	   }
	}
}

void init_static_image() {
	int c;
	for (int i = 0; i < 64; i++) {
	   for (int j = 0; j < 64; j++) {
         	static_image[i][j][0] = rand()%255;
         	static_image[i][j][1] = rand()%255;
         	static_image[i][j][2] = rand()%255;
	   }
	}
}



void display() {
	glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	glPushMatrix();
	
		glTranslatef (0, 0, -10);
		glEnable(GL_TEXTURE_2D);	
		glBindTexture (GL_TEXTURE_2D, static_id);
		glutSolidTeapot(2.0);
		glDisable(GL_TEXTURE_2D);
	glPopMatrix();
	glFlush();
	glutSwapBuffers();
	glutPostRedisplay();
}

void camera() {
	// Setup viewing
	glMatrixMode (GL_PROJECTION);
	glLoadIdentity();
	gluPerspective (60.0f, 1.5, 0.1, 1000);
	glMatrixMode (GL_MODELVIEW);
}

void doLights() {
	glEnable (GL_LIGHTING);
	glEnable (GL_LIGHT0);
	glLightfv (GL_LIGHT0, GL_POSITION, light_position);
	glLightfv (GL_LIGHT0, GL_DIFFUSE, diffuse_light);
	
}

void setupTextures() {
	
	init_static_image();
	init_check_image();

	glGenTextures (5, &check_id);
	// Start binding a texture, and store on graphics card
	glBindTexture (GL_TEXTURE_2D, check_id);
	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 64, 64, 0, GL_RGB, GL_UNSIGNED_BYTE, check_image);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);

	glGenTextures (5, &static_id);
	// Start binding a texture, and store on graphics card
	glBindTexture (GL_TEXTURE_2D, static_id);
	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 64, 64, 0, GL_RGB, GL_UNSIGNED_BYTE, static_image);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
}

int main (int argc, char** argv) {
	glutInit(&argc, argv);
	glutInitDisplayMode (GLUT_DOUBLE | GLUT_DEPTH | GLUT_RGB);
	
	glutCreateWindow ("June 12th, 2006");
	setupTextures();

	glEnable (GL_DEPTH_TEST);
	
	camera();
	doLights();
	
	glutDisplayFunc (display);
	glutMainLoop();
}