int generate_landscape() {	GLfloat x, y;	int i=0;	for (y=-size/2;y<size/2;y+=1.0f)		for (x=-size/2;x<size/2;x+=1.0f) {			p[i].x = x;			p[i].y = y;			i++;		}	for (i=0;i<size*size;i++) {			p[i].z = randFloat(-1.0f, 2.0f);	}	return TRUE;}int draw_landscape() {	int i;	glPushMatrix();	for (i=0;i<size*size;i++) {		if (i != 5 && i != 11 && i != 17 && i != 23 && i != 29 && i != 35) {			if (i != 30 && i != 31 && i != 32 && i != 33 && i != 34 && i != 35) {				glBegin(GL_QUADS);					glTexCoord2f(0.0f, 1.0f);	glVertex3f(p[i].x, p[i].y, p[i].z);					glTexCoord2f(1.0f, 1.0f);	glVertex3f(p[i+1].x, p[i+1].y, p[i+1].z);					glTexCoord2f(1.0f, 0.0f);	glVertex3f(p[i+size+1].x, p[i+size+1].y, p[i+size+1].z);					glTexCoord2f(0.0f, 0.0f);	glVertex3f(p[i+size].x, p[i+size].y, p[i+size].z);				glEnd();			}		}	}	glPopMatrix();	// water	glPushMatrix();	//glColor3f(0.0f, 0.0f, 1.0f);	glDisable(GL_TEXTURE_2D);		glBegin(GL_QUADS);		glVertex3f(p[0].x, p[0].y, waterheight);		glVertex3f(p[5].x, p[5].y, waterheight);		glVertex3f(p[35].x, p[35].y, waterheight);		glVertex3f(p[30].x, p[30].y, waterheight);	glEnd();	glEnable(GL_TEXTURE_2D);	glPopMatrix();	return TRUE;}