glColor3ub(0, 255, 128);        if (wrapt == GL_REPEAT) {        drawstr(360, 200, "GL_REPEAT");    } else {        drawstr(360, 200, "GL_CLAMP");    }        glColor3ub(255, 255, 255);    glGetFloatv(GL_CURRENT_RASTER_POSITION, pos);     drawstr(pos[0]+2, glutGet(GLUT_WINDOW_HEIGHT)-pos[1]-1, ");");    glColor3ub(0, 255, 128);        if (env == GL_MODULATE) {        drawstr(360, 220, "GL_MODULATE");    } else if (env == GL_DECAL) {        drawstr(360, 220, "GL_DECAL");    } else if (env == GL_BLEND) {        drawstr(360, 220, "GL_BLEND");    } else {        drawstr(360, 220, "GL_REPLACE");    }        glColor3ub(255, 255, 255);    glGetFloatv(GL_CURRENT_RASTER_POSITION, pos);     drawstr(pos[0]+2, glutGet(GLUT_WINDOW_HEIGHT)-pos[1]-1, ");");        setfont("helvetica", 18);        cell_draw(&bcolor[0]);    cell_draw(&bcolor[1]);    cell_draw(&bcolor[2]);    cell_draw(&bcolor[3]);        cell_draw(&ecolor[0]);    cell_draw(&ecolor[1]);    cell_draw(&ecolor[2]);    cell_draw(&ecolor[3]);        if (!selection) {        glColor3ub(255, 255, 0);        drawstr(10, 525,            "Click on the arguments and move the mouse to modify values.");    }           glutSwapBuffers();}voidpolygon_mouse(int x, int y){/* mouse should only hit _one_ of the cells, so adding up all    the hits just propagates a single hit. */    selection += cell_hit(&texcoords[0], x, y);    selection += cell_hit(&texcoords[1], x, y);    selection += cell_hit(&texcoords[2], x, y);    selection += cell_hit(&texcoords[3], x, y);    selection += cell_hit(&texcoords[4], x, y);    selection += cell_hit(&texcoords[5], x, y);    selection += cell_hit(&texcoords[6], x, y);    selection += cell_hit(&texcoords[7], x, y);    selection += cell_hit(&vertices[0], x, y);    selection += cell_hit(&vertices[1], x, y);    selection += cell_hit(&vertices[2], x, y);    selection += cell_hit(&vertices[3], x, y);    selection += cell_hit(&vertices[4], x, y);    selection += cell_hit(&vertices[5], x, y);    selection += cell_hit(&vertices[6], x, y);    selection += cell_hit(&vertices[7], x, y);    selection += cell_hit(&vertices[8], x, y);    selection += cell_hit(&vertices[9], x, y);    selection += cell_hit(&vertices[10], x, y);    selection += cell_hit(&vertices[11], x, y);    selection += cell_hit(&pcolor[0], x, y);    selection += cell_hit(&pcolor[1], x, y);    selection += cell_hit(&pcolor[2], x, y);    selection += cell_hit(&pcolor[3], x, y);}voidmatrix_mouse(int button, int state, int x, int y){    selection = 0;        if (state == GLUT_DOWN) {        polygon_mouse(x, y);        /* mouse should only hit _one_ of the cells, so adding up all        the hits just propagates a single hit. */        selection += cell_hit(&translation[0], x, y);        selection += cell_hit(&translation[1], x, y);        selection += cell_hit(&translation[2], x, y);        selection += cell_hit(&rotation[0], x, y);        selection += cell_hit(&rotation[1], x, y);        selection += cell_hit(&rotation[2], x, y);        selection += cell_hit(&rotation[3], x, y);        selection += cell_hit(&scale[0], x, y);        selection += cell_hit(&scale[1], x, y);        selection += cell_hit(&scale[2], x, y);    }        old_y = y;        redisplay_all();}voidparameters_mouse(int button, int state, int x, int y){    selection = 0;        if (state == GLUT_DOWN) {        polygon_mouse(x, y);        selection += cell_hit(&bcolor[0], x, y);        selection += cell_hit(&bcolor[1], x, y);        selection += cell_hit(&bcolor[2], x, y);        selection += cell_hit(&bcolor[3], x, y);        selection += cell_hit(&ecolor[0], x, y);        selection += cell_hit(&ecolor[1], x, y);        selection += cell_hit(&ecolor[2], x, y);        selection += cell_hit(&ecolor[3], x, y);        if (!selection) {            if (y < 145 && y > 125) {                if (minfilter == GL_NEAREST)                    minfilter = GL_LINEAR;                else if (minfilter == GL_LINEAR)                    minfilter = GL_NEAREST_MIPMAP_NEAREST;                else if (minfilter == GL_NEAREST_MIPMAP_NEAREST)                    minfilter = GL_NEAREST_MIPMAP_LINEAR;                else if (minfilter == GL_NEAREST_MIPMAP_LINEAR)                    minfilter = GL_LINEAR_MIPMAP_NEAREST;                else if (minfilter == GL_LINEAR_MIPMAP_NEAREST)                    minfilter = GL_LINEAR_MIPMAP_LINEAR;                else                     minfilter = GL_NEAREST;            } else if (y < 165 && y > 145) {                if (magfilter == GL_NEAREST)                    magfilter = GL_LINEAR;                else                    magfilter = GL_NEAREST;            } else if (y < 185 && y > 165) {                if (wraps == GL_REPEAT)                    wraps = GL_CLAMP;                else                    wraps = GL_REPEAT;            } else if (y < 205 && y > 185) {                if (wrapt == GL_REPEAT)                    wrapt = GL_CLAMP;                else                    wrapt = GL_REPEAT;            } else if (y < 225 && y > 205) {                if (env == GL_REPLACE_EXT)                    env = GL_DECAL;                else if (env == GL_DECAL)                    env = GL_BLEND;                else if (env == GL_BLEND)                    env = GL_MODULATE;                else                    env = GL_REPLACE_EXT;            }        }    }        glutSetWindow(screen);    texenv();    glutSetWindow(world);    texenv();        old_y = y;        redisplay_all();}voidcommand_motion(int x, int y){    cell_update(&translation[0], old_y-y);    cell_update(&translation[1], old_y-y);    cell_update(&translation[2], old_y-y);    cell_update(&rotation[0], old_y-y);    cell_update(&rotation[1], old_y-y);    cell_update(&rotation[2], old_y-y);    cell_update(&rotation[3], old_y-y);    cell_update(&scale[0], old_y-y);    cell_update(&scale[1], old_y-y);    cell_update(&scale[2], old_y-y);    cell_update(&texcoords[0], old_y-y);    cell_update(&texcoords[1], old_y-y);    cell_update(&texcoords[2], old_y-y);    cell_update(&texcoords[3], old_y-y);    cell_update(&texcoords[4], old_y-y);    cell_update(&texcoords[5], old_y-y);    cell_update(&texcoords[6], old_y-y);    cell_update(&texcoords[7], old_y-y);    cell_update(&vertices[0], old_y-y);    cell_update(&vertices[1], old_y-y);    cell_update(&vertices[2], old_y-y);    cell_update(&vertices[3], old_y-y);    cell_update(&vertices[4], old_y-y);    cell_update(&vertices[5], old_y-y);    cell_update(&vertices[6], old_y-y);    cell_update(&vertices[7], old_y-y);    cell_update(&vertices[8], old_y-y);    cell_update(&vertices[9], old_y-y);    cell_update(&vertices[10], old_y-y);    cell_update(&vertices[11], old_y-y);    cell_update(&pcolor[0], old_y-y);    cell_update(&pcolor[1], old_y-y);    cell_update(&pcolor[2], old_y-y);    cell_update(&pcolor[3], old_y-y);    cell_update(&bcolor[0], old_y-y);    cell_update(&bcolor[1], old_y-y);    cell_update(&bcolor[2], old_y-y);    cell_update(&bcolor[3], old_y-y);    cell_update(&ecolor[0], old_y-y);    cell_update(&ecolor[1], old_y-y);    cell_update(&ecolor[2], old_y-y);    cell_update(&ecolor[3], old_y-y);        glutSetWindow(screen);    texenv();    glutSetWindow(world);    texenv();        old_y = y;        redisplay_all();}voidtimer(int value){    stipple = 0x00ff << value;    if (value > 8)        stipple += 0x00ff >> (8-(value-8));        value++;    if (value >= 16)        value = 0;        glutSetWindow(world);    glutPostRedisplay();        glutTimerFunc(100, timer, value);}voidredisplay_all(void){    glutSetWindow(command);    glutPostRedisplay();    glutSetWindow(world);    world_reshape(sub_width, sub_height);    glutPostRedisplay();    glutSetWindow(screen);    screen_reshape(sub_width, sub_height);    glutPostRedisplay();}voidmain_keyboard(unsigned char key, int x, int y){    switch (key) {    case 'm':        glutSetWindow(command);        glutMouseFunc(matrix_mouse);        glutDisplayFunc(matrix_display);        break;    case 'p':        glutSetWindow(command);        glutMouseFunc(parameters_mouse);        glutDisplayFunc(parameters_display);        break;    case 'r':        translation[0].value = 0.0;        translation[1].value = 0.0;        translation[2].value = 0.0;        rotation[0].value = 0.0;        rotation[1].value = 0.0;        rotation[2].value = 0.0;        rotation[3].value = 1.0;        scale[0].value = 1.0;        scale[1].value = 1.0;        scale[2].value = 1.0;        texcoords[0].value = 0.0;        texcoords[1].value = 0.0;        texcoords[2].value = 1.0;        texcoords[3].value = 0.0;        texcoords[4].value = 1.0;        texcoords[5].value = 1.0;        texcoords[6].value = 0.0;        texcoords[7].value = 1.0;        vertices[0].value = -1.0;        vertices[1].value = -1.0;        vertices[2].value = 0.0;        vertices[3].value = 1.0;        vertices[4].value = -1.0;        vertices[5].value = 0.0;        vertices[6].value = 1.0;        vertices[7].value = 1.0;        vertices[8].value = 0.0;        vertices[9].value = -1.0;        vertices[10].value = 1.0;        vertices[11].value = 0.0;        pcolor[0].value = 0.6;        pcolor[1].value = 0.6;        pcolor[2].value = 0.6;        pcolor[3].value = 0.6;        bcolor[0].value = 1.0;        bcolor[1].value = 0.0;        bcolor[2].value = 0.0;        bcolor[3].value = 1.0;        ecolor[0].value = 0.0;        ecolor[1].value = 1.0;        ecolor[2].value = 0.0;        ecolor[3].value = 1.0;        minfilter = GL_NEAREST;        magfilter = GL_NEAREST;        env = GL_MODULATE;        wraps = GL_REPEAT;        wrapt = GL_REPEAT;        break;    case 27:        exit(0);    }        glutSetWindow(screen);    texenv();    redisplay_all();}voidcommand_menu(int value){    main_keyboard((unsigned char)value, 0, 0);}intmain(int argc, char** argv){    image = glmReadPPM("data/fishermen.ppm", &iwidth, &iheight);    if (!image)        exit(0);        glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE);    glutInitWindowSize((512+GAP*3)*3/2, 512+GAP*3);    glutInitWindowPosition(50, 50);    glutInit(&argc, argv);        window = glutCreateWindow("Texture");    glutReshapeFunc(main_reshape);    glutDisplayFunc(main_display);    glutKeyboardFunc(main_keyboard);        world = glutCreateSubWindow(window, GAP, GAP, 256, 256);    glutReshapeFunc(world_reshape);    glutDisplayFunc(world_display);    glutKeyboardFunc(main_keyboard);    glutCreateMenu(world_menu);    glutAddMenuEntry("Textures", 0);    glutAddMenuEntry("", 0);    glutAddMenuEntry("Fishermen", 'f');    glutAddMenuEntry("OpenGL Logo", 'o');    glutAddMenuEntry("Checker", 'c');    glutAddMenuEntry("Marble", 'm');    glutAddMenuEntry("Train", 't');    glutAttachMenu(GLUT_RIGHT_BUTTON);        texture();        screen = glutCreateSubWindow(window, GAP+256+GAP, GAP, 256, 256);    glutReshapeFunc(screen_reshape);    glutDisplayFunc(screen_display);    glutKeyboardFunc(main_keyboard);    glutMotionFunc(screen_motion);    glutMouseFunc(screen_mouse);        texture();        command = glutCreateSubWindow(window, GAP+256+GAP, GAP+256+GAP, 256, 256);    glutReshapeFunc(command_reshape);    glutMotionFunc(command_motion);    glutDisplayFunc(parameters_display);    glutMouseFunc(parameters_mouse);    glutKeyboardFunc(main_keyboard);    glutCreateMenu(command_menu);    glutAddMenuEntry("Texture", 0);    glutAddMenuEntry("", 0);    glutAddMenuEntry("Matrix", 'm');    glutAddMenuEntry("Environment/Parameters", 'p');    glutAddMenuEntry("Reset parameters (r)", 'r');    glutAddMenuEntry("", 0);    glutAddMenuEntry("Quit", 27);    glutAttachMenu(GLUT_RIGHT_BUTTON);        redisplay_all();        glutTimerFunc(500, timer, 0);    glutMainLoop();    return 0;}