C++ OpenGL纹理级别

我正在尝试学习OpenGL，我想开始制作纹理，但我被卡住了。我已经创建了一个包含两个房间和一个走廊的标高，所以我希望不同部分有不同的纹理（即，地板纹理、墙壁纹理等等），但是在看了教程之后，我仍然被卡住了，我需要在代码中把它放在哪里

#include <windows.h>
#include <gl\gl.h>
#include <gl\glut.h>
#include <gl\glu.h>

void init(void);
void display(void);
void keyboard(unsigned char, int, int);
void resize(int, int);

int is_depth; /* depth testing flag */

int main (int argc, char **argv)
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);
    glutInitWindowSize(600, 600);
    glutInitWindowPosition(40, 40);
    glutCreateWindow("The Cube World");
    init();
    glutDisplayFunc(display);
    glutKeyboardFunc(keyboard);

    /* This time we're going to keep the aspect ratio
    constant by trapping the window resizes. */
    glutReshapeFunc(resize);

    glutMainLoop();
    return 0;
}

void init(void)
{
    glClearColor(0.0, 0.0, 0.0, 0.0);
    glEnable(GL_DEPTH_TEST);
    is_depth = 1;
    glMatrixMode(GL_MODELVIEW);
}

void display(void)
{
    if (is_depth)
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    else
        glClear(GL_COLOR_BUFFER_BIT);

    glBegin(GL_QUADS);

    //floor
    glColor3f(0.2f, 0.2f, 0.2f);
    glVertex3f(-50.0, 0.0, -25.0);
    glColor3f(0.4f, 0.4f, 0.4f);
    glVertex3f(-50.0, 0.0, 25.0);
    glColor3f(0.6f, 0.6f, 0.6f);
    glVertex3f(50.0, 0.0, 25.0);
    glColor3f(0.8f, 0.8f, 0.8f);
    glVertex3f(50.0, 0.0, -25.0);

    //left wall
    glColor3f(0.2f, 0.2f, 0.2f);
    glVertex3f(-50.0, 0.0, -25.0);
    glColor3f(0.4f, 0.4f, 0.4f);
    glVertex3f(-50.0, 00.0, 25.0);
    glColor3f(0.6f, 0.6f, 0.6f);
    glVertex3f(-50.0, 25.0, 25.0);
    glColor3f(0.8f, 0.8f, 0.8f);
    glVertex3f(-50.0, 25.0, -25.0);

    //right wall
    glColor3f(0.2f, 0.2f, 0.2f);
    glVertex3f(50.0, 0.0, -25.0);
    glColor3f(0.4f, 0.4f, 0.4f);
    glVertex3f(50.0, 00.0, 25.0);
    glColor3f(0.6f, 0.6f, 0.6f);
    glVertex3f(50.0, 25.0, 25.0);
    glColor3f(0.8f, 0.8f, 0.8f);
    glVertex3f(50.0, 25.0, -25.0);

    //roof
    glColor3f(0.2f, 0.2f, 0.2f);
    glVertex3f(-50.0, 25.0, -25.0);
    glColor3f(0.4f, 0.4f, 0.4f);
    glVertex3f(-50.0, 25.0, 25.0);
    glColor3f(0.6f, 0.6f, 0.6f);
    glVertex3f(50.0, 25.0, 25.0);
    glColor3f(0.8f, 0.8f, 0.8f);
    glVertex3f(50.0, 25.0, -25.0);

    //right panel
    glColor3f(0.2f, 0.2f, 0.2f);
    glVertex3f(10.0, 0.0, -25.0);
    glColor3f(0.4f, 0.4f, 0.4f);
    glVertex3f(10.0, 15.0, -25.0);
    glColor3f(0.6f, 0.6f, 0.6f);
    glVertex3f(50.0, 15.0, -25.0);
    glColor3f(0.8f, 0.8f, 0.8f);
    glVertex3f(50.0, 0.0, -25.0);

    //left panel
    glColor3f(0.2f, 0.2f, 0.2f);
    glVertex3f(-10.0, 0.0, -25.0);
    glColor3f(0.4f, 0.4f, 0.4f);
    glVertex3f(-10.0, 15.0, -25.0);
    glColor3f(0.6f, 0.6f, 0.6f);
    glVertex3f(-50.0, 15.0, -25.0);
    glColor3f(0.8f, 0.8f, 0.8f);
    glVertex3f(-50.0, 0.0, -25.0);

    //top panel
    glColor3f(0.2f, 0.2f, 0.2f);
    //bottom right
    glVertex3f(50.0, 15.0, -25.0);
    glColor3f(0.4f, 0.4f, 0.4f);
    //top right
    glVertex3f(50.0, 25.0, -25.0);
    glColor3f(0.6f, 0.6f, 0.6f);
    //top left
    glVertex3f(-50.0, 25.0, -25.0);
    glColor3f(0.8f, 0.8f, 0.8f);
    //bottom left
    glVertex3f(-50.0, 15.0, -25.0);

    // corridor floor
    glColor3f(0.2f, 0.2f, 0.2f);
    glVertex3f(-10.0, 0.0, -25.0);
    glColor3f(0.4f, 0.4f, 0.4f);
    glVertex3f(-10.0, 0.0, -275.0);
    glColor3f(0.6f, 0.6f, 0.6f);
    glVertex3f(10.0, 0.0, -275.0);
    glColor3f(0.8f, 0.8f, 0.8f);
    glVertex3f(10.0, 0.0, -25.0);

    // corridor left wall
    glColor3f(0.2f, 0.2f, 0.2f);
    glVertex3f(-10.0, 0.0, -25.0);
    glColor3f(0.4f, 0.4f, 0.4f);
    glVertex3f(-10.0, 00.0, -275.0);
    glColor3f(0.6f, 0.6f, 0.6f);
    glVertex3f(-10.0, 15.0, -275.0);
    glColor3f(0.8f, 0.8f, 0.8f);
    glVertex3f(-10.0, 15.0, -25.0);

    // corridor right wall
    glColor3f(0.2f, 0.2f, 0.2f);
    glVertex3f(10.0, 0.0, -25.0);
    glColor3f(0.4f, 0.4f, 0.4f);
    glVertex3f(10.0, 00.0, -275.0);
    glColor3f(0.6f, 0.6f, 0.6f);
    glVertex3f(10.0, 15.0, -275.0);
    glColor3f(0.8f, 0.8f, 0.8f);
    glVertex3f(10.0, 15.0, -25.0);

    //corridor roof
    glColor3f(0.2f, 0.2f, 0.2f);
    glVertex3f(-10.0, 15.0, -25.0);
    glColor3f(0.4f, 0.4f, 0.4f);
    glVertex3f(-10.0, 15.0, -275.0);
    glColor3f(0.6f, 0.6f, 0.6f);
    glVertex3f(10.0, 15.0, -275.0);
    glColor3f(0.8f, 0.8f, 0.8f);
    glVertex3f(10.0, 15.0, -25.0);

    //right panel room 2
    glColor3f(0.2f, 0.2f, 0.2f);
    glVertex3f(10.0, 0.0, -275.0);
    glColor3f(0.4f, 0.4f, 0.4f);
    glVertex3f(10.0, 15.0, -275.0);
    glColor3f(0.6f, 0.6f, 0.6f);
    glVertex3f(50.0, 15.0, -275.0);
    glColor3f(0.8f, 0.8f, 0.8f);
    glVertex3f(50.0, 0.0, -275.0);

    //left panel room 2
    glColor3f(0.2f, 0.2f, 0.2f);
    glVertex3f(-10.0, 0.0, -275.0);
    glColor3f(0.4f, 0.4f, 0.4f);
    glVertex3f(-10.0, 15.0, -275.0);
    glColor3f(0.6f, 0.6f, 0.6f);
    glVertex3f(-50.0, 15.0, -275.0);
    glColor3f(0.8f, 0.8f, 0.8f);
    glVertex3f(-50.0, 0.0, -275.0);

    //top panel room 2
    glColor3f(0.2f, 0.2f, 0.2f);
    glVertex3f(50.0, 15.0, -275.0);
    glColor3f(0.4f, 0.4f, 0.4f);
    glVertex3f(50.0, 25.0, -275.0);
    glColor3f(0.6f, 0.6f, 0.6f);
    glVertex3f(-50.0, 25.0, -275.0);
    glColor3f(0.8f, 0.8f, 0.8f);
    glVertex3f(-50.0, 15.0, -275.0);

    //right wall room 2
    glColor3f(0.2f, 0.2f, 0.2f);
    glVertex3f(50.0, 0.0, -275.0);
    glColor3f(0.4f, 0.4f, 0.4f);
    glVertex3f(50.0, 00.0, -325.0);
    glColor3f(0.6f, 0.6f, 0.6f);
    glVertex3f(50.0, 25.0, -325.0);
    glColor3f(0.8f, 0.8f, 0.8f);
    glVertex3f(50.0, 25.0, -275.0);

    //left wall room 2
    glColor3f(0.2f, 0.2f, 0.2f);
    glVertex3f(-50.0, 0.0, -275.0);
    glColor3f(0.4f, 0.4f, 0.4f);
    glVertex3f(-50.0, 00.0, -325.0);
    glColor3f(0.6f, 0.6f, 0.6f);
    glVertex3f(-50.0, 25.0, -325.0);
    glColor3f(0.8f, 0.8f, 0.8f);
    glVertex3f(-50.0, 25.0, -275.0);

    //roof room 2
    glColor3f(0.2f, 0.2f, 0.2f);
    glVertex3f(-50.0, 25.0, -275.0);
    glColor3f(0.4f, 0.4f, 0.4f);
    glVertex3f(-50.0, 25.0, -325.0);
    glColor3f(0.6f, 0.6f, 0.6f);
    glVertex3f(50.0, 25.0, -325.0);
    glColor3f(0.8f, 0.8f, 0.8f);
    glVertex3f(50.0, 25.0, -275.0);

    //back wall room 2
    glColor3f(0.2f, 0.2f, 0.2f);
    glVertex3f(50.0, 0.0, -325.0);
    glColor3f(0.4f, 0.4f, 0.4f);
    glVertex3f(50.0, 25.0, -325.0);
    glColor3f(0.6f, 0.6f, 0.6f);
    glVertex3f(-50.0, 25.0, -325.0);
    glColor3f(0.8f, 0.8f, 0.8f);
    glVertex3f(-50.0, 0.0, -325.0);

    //floor room 2
    glColor3f(0.2f, 0.2f, 0.2f);
    glVertex3f(-50.0, 0.0, -275.0);
    glColor3f(0.4f, 0.4f, 0.4f);
    glVertex3f(-50.0, 0.0, -325.0);
    glColor3f(0.6f, 0.6f, 0.6f);
    glVertex3f(50.0, 0.0, -325.0);
    glColor3f(0.8f, 0.8f, 0.8f);
    glVertex3f(50.0, 0.0, -275.0);

    glEnd();
    glutSwapBuffers();
}

void keyboard(unsigned char key, int x, int y)
{
    switch (key)
    {
        case 'a':
        case 'A':
            glTranslatef(5.0, 0.0, 0.0);
            break;
        case 'd':
        case 'D':
            glTranslatef(-5.0, 0.0, 0.0);
            break;
        case 'w':
        case 'W':
            glTranslatef(0.0, 0.0, 5.0);
            break;
        case 's':
        case 'S':
            glTranslatef(0.0, 0.0, -5.0);
            break;
        case 't':
        case 'T':
            if (is_depth)
            {
                is_depth = 0;
                glDisable(GL_DEPTH_TEST);
            }
            else
            {
                is_depth = 1;
                glEnable(GL_DEPTH_TEST);
            }
    }
    display();
}

void resize(int width, int height)
{
    if (height == 0)
        height = 1;

    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();

    /* Note we divide our width by our height to get the aspect ratio. */
    gluPerspective(45.0, width / height, 1.0, 400.0);

    /* Set initial position */
    glTranslatef(0.0, -5.0, -150.0);

    glMatrixMode(GL_MODELVIEW);
}

#包括
#包括
#包括
#包括
void init（void）；
作废显示（作废）；
无效键盘（无符号字符，int，int）；
无效调整大小（int，int）；
int是_深度；/*深度测试标志*/
int main（int argc，字符**argv）
{
glutInit（&argc，argv）；
glutInitDisplayMode（GLUT_DOUBLE | GLUT_RGB）；
glutInitWindowSize（600600）；
位置（40,40）；
glutCreateWindow（“立方体世界”）；
init（）；
glutDisplayFunc（显示器）；
键盘Func（键盘）；
/*这次我们要保持纵横比
通过捕捉窗口大小来调整常量*/
GLUTEFUNC（调整大小）；
glutMainLoop（）；
返回0；
}
void init（void）
{
glClearColor（0.0,0.0,0.0,0.0）；
glEnable（GLU深度试验）；
深度等于1；
glMatrixMode（GLU模型视图）；
}
作废显示（作废）
{
如果（是深度）
glClear（GL_颜色_缓冲_位| GL_深度_缓冲_位）；
其他的
glClear（GLU颜色缓冲位）；
glBegin（GL_QUADS）；
//地板
GL3F（0.2f，0.2f，0.2f）；
glVertex3f（-50.0,0.0，-25.0）；
GL3F（0.4f，0.4f，0.4f）；
glVertex3f（-50.0,0.0,25.0）；
GL3F（0.6f，0.6f，0.6f）；
glVertex3f（50.0,0.0,25.0）；
GL3F（0.8f，0.8f，0.8f）；
glVertex3f（50.0,0.0，-25.0）；
//左墙
GL3F（0.2f，0.2f，0.2f）；
glVertex3f（-50.0,0.0，-25.0）；
GL3F（0.4f，0.4f，0.4f）；
glVertex3f（-50.0,00.0,25.0）；
GL3F（0.6f，0.6f，0.6f）；
glVertex3f（-50.0,25.0,25.0）；
GL3F（0.8f，0.8f，0.8f）；
glVertex3f（-50.0,25.0，-25.0）；
//右墙
GL3F（0.2f，0.2f，0.2f）；
glVertex3f（50.0,0.0，-25.0）；
GL3F（0.4f，0.4f，0.4f）；
glVertex3f（50.0,00.0,25.0）；
GL3F（0.6f，0.6f，0.6f）；
glVertex3f（50.0,25.0,25.0）；
GL3F（0.8f，0.8f，0.8f）；
glVertex3f（50.0,25.0，-25.0）；
//屋顶
GL3F（0.2f，0.2f，0.2f）；
glVertex3f（-50.0,25.0，-25.0）；
GL3F（0.4f，0.4f，0.4f）；
glVertex3f（-50.0,25.0,25.0）；
GL3F（0.6f，0.6f，0.6f）；
glVertex3f（50.0,25.0,25.0）；
GL3F（0.8f，0.8f，0.8f）；
glVertex3f（50.0,25.0，-25.0）；
//右面板
GL3F（0.2f，0.2f，0.2f）；
glVertex3f（10.0,0.0，-25.0）；
GL3F（0.4f，0.4f，0.4f）；
glVertex3f（10.0,15.0，-25.0）；
GL3F（0.6f，0.6f，0.6f）；
glVertex3f（50.0,15.0，-25.0）；
GL3F（0.8f，0.8f，0.8f）；
glVertex3f（50.0,0.0，-25.0）；
//左面板
GL3F（0.2f，0.2f，0.2f）；
glVertex3f（-10.0,0.0，-25.0）；
GL3F（0.4f，0.4f，0.4f）；
glVertex3f（-10.0,15.0，-25.0）；
GL3F（0.6f，0.6f，0.6f）；
glVertex3f（-50.0,15.0，-25.0）；
GL3F（0.8f，0.8f，0.8f）；
glVertex3f（-50.0,0.0，-25.0）；
//顶板
GL3F（0.2f，0.2f，0.2f）；
//右下角
glVertex3f（50.0,15.0，-25.0）；
GL3F（0.4f，0.4f，0.4f）；
//右上角
glVertex3f（50.0,25.0，-25.0）；
GL3F（0.6f，0.6f，0.6f）；
//左上角
glVertex3f（-50.0,25.0，-25.0）；
GL3F（0.8f，0.8f，0.8f）；
//左下角
glVertex3f（-50.0,15.0，-25.0）；
//走廊楼层
GL3F（0.2f，0.2f，0.2f）；
glVertex3f（-10.0,0.0，-25.0）；
GL3F（0.4f，0.4f，0.4f）；
glVertex3f（-10.0,0.0，-275.0）；
GL3F（0.6f，0.6f，0.6f）；
glVertex3f（10.0,0.0，-275.0）；
GL3F（0.8f，0.8f，0.8f）；
glVertex3f（10.0,0.0，-25.0）；
//走廊左墙
GL3F（0.2f，0.2f，0.2f）；
glVertex3f（-10.0,0.0，-25.0）；
GL3F（0.4f，0.4f，0.4f）；
glVertex3f（-10.0,00.0，-275.0）；
GL3F（0.6f，0.6f，0.6f）；
glVertex3f（-10.0,15.0，-275.0）；
GL3F（0.8f，0.8f，0.8f）；
glVertex3f（-10.0,15.0，-25.0）；
//走廊右墙
GL3F（0.2f，0.2f，0.2f）；
glVertex3f（10.0,0.0，-25.0）；
GL3F（0.4f，0.4f，0.4f）；
glVertex3f（10.0,00.0，-275.0）；
GL3F（0.6f，0.6f，0.6f）；
glVertex3f（10.0,15.0，-275.0）；
GL3F（0.8f，0.8f，0.8f）；
glVertex3f（10.0,15.0，-25.0）；
//走廊屋顶
GL3F（0.2f，0.2f，0.2f）；
glVertex3f（-10.0,15.0，-25.0）；
GL3F（0.4f，0.4f，0.4f）；
glVertex3f（-10.0,15.0，-275.0）；
GL3F（0.6f，0.6f，0.6f）；
glVertex3f（10.0,15.0，-275.0）；
GL3F（0.8f，0.8f，0.8f）；
glVertex3f（10.0,15.0，-25.0）；
//右面板室2
GL3F（0.2f，0.2f，0.2f）；
glVertex3f（10.0,0.0，-275.0）；
GL3F（0.4f，0.4f，0.4f）；
glVertex3f（10.0,15.0，-275.0）；
GL3F（0.6f，0.6f，0.6f）；
glVertex3f（50.0,15.0，-275.0）；
GL3F（0.8f，0.8f，0.8f）；
glVertex3f（50.0,0.0，-275.0）；
//左面板室2
GL3F（0.2f，0.2f，0.2f）；
glVertex3f（-10.0,0.0，-275.0）；
GL3F（0.4f，0.4f，0.4f）；
glVertex3f（-10.0,15.0，-275.0）；
GL3F（0.6f，0.6f，0.6f）；
glVertex3f（-50.0,15.0，-275.0）；
GL3F（0.8f，0.8f，0.8f）；
glVertex3f（-50.0,0.0，-275.0）；
//顶板室2
GL3F（0.2f，0.2f，0.2f）；
glVertex3f（50.0,15.0，-275.0）；
GL3F（0.4f，0.4f，0.4f）；
glVertex3f（50.0,25.0，-275.0）；
GL3F（0.6f，0.6f，0.6f）；
glVertex3f（-50.0,25.0，-275.0）；
GL3F（0.8f，0.8f，0.8f）；
glVertex3f（-50.0,15.0，-275.0）；
//右墙2号房间
GL3F（0.2f，0.2f，0.2f）；
glVertex3f（50.0,0.0，-275.0）；
GL3F（0.4f，0.4f，0.4f）；
glVertex3f（50.0,00.0，-325.0）；
GL3F（0.6f，0.6f，0.6f）；
glVertex3f（50.0,25.0，-325.0）；
GL3F（0.8f，0.8f，0.8f）；
glVertex3f（50.0,25.0，-275.0）；
//左墙2号房间
GL3F（0.2f，0.2f，0.2f）；
glVertex3f（-50.0,0.0，-275.0）；
GL3F（0.4f，0.4f，0.4f）；
glVertex3f（-50.0,00.0，-325.0）；
GL3F（0.6f，0.6f，0.6f）；
glVertex3f（-50.0）