OpenGL给立方体纹理贴图

[没有昵称阿]

下面是我的代码，实现的功能是绘制一个立方体，并给六个面贴上不同的纹理，（导入的六张bmp图片都是256*256大小的）。但是看到的效果是乱的，谁能帮我看看嘛？感激不尽~~

在这里我用到了SOIL（Simple OpenGL Image Library）库：http://nehe.gamedev.net/tutorial/lesson_06_texturing_update/47002/

我的代码：

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

#include "SOIL.h"

GLuint texture[6];//6 textures for 6 faces of the cube

GLfloat xRot,yRot,zRot;//control cube's rotation

//load the bitmap and convert it into a texture
int LoadGLTextures()
{
	int Status = 0;
	char *bmpFile[6] = {"BmpFile/Ferrary.bmp","BmpFile/Honda.bmp","BmpFile/Hust.bmp",
		"BmpFile/Lamborghini.bmp","BmpFile/NeHe.bmp","BmpFile/Porsche.bmp"};
	for (int i = 0;i < 6;++i)
	{
		texture[i] = SOIL_load_OGL_texture(
			bmpFile[i],
			SOIL_LOAD_AUTO,
			SOIL_CREATE_NEW_ID,
			SOIL_FLAG_INVERT_Y);
		printf("texture[%d]: %d\n",i,texture[i]);
		if(texture[i] == 0)
			Status = 0;
		glBindTexture(GL_TEXTURE_2D,texture[i]);
		glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
		glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
	}

	return Status;
}

int init()
{
	glEnable(GL_TEXTURE_2D);
	if(!LoadGLTextures())
		return 0;
	glShadeModel(GL_SMOOTH);
	glClearColor(0.0f,0.0f,0.0f,0.5f);
	glClearDepth(1.0f);
	glEnable(GL_DEPTH_TEST);
	glDepthFunc(GL_LEQUAL);
	glHint(GL_PERSPECTIVE_CORRECTION_HINT,GL_NICEST);
	return 1;
}

void display()
{
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	glLoadIdentity();
	glTranslatef(0.0f,0.0f,-5.0f);
	glRotatef(xRot,1.0f,0.0f,0.0f);
	glRotatef(yRot,0.0f,1.0f,0.0f);
	glRotatef(zRot,0.0f,0.0f,1.0f);

	//glRotatef(45,1.0f,0.0f,0.0f);
	//glRotatef(45,0.0f,1.0f,0.0f);

	glBindTexture(GL_TEXTURE_2D,texture[0]);

	glBegin(GL_QUADS); 
	// Front Face 
	// Bottom Left Of The Texture and Quad 
	glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f,  1.0f); 
	// Bottom Right Of The Texture and Quad 
	glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f,  1.0f); 
	// Top Right Of The Texture and Quad 
	glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f,  1.0f,  1.0f); 
	// Top Left Of The Texture and Quad 
	glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f,  1.0f,  1.0f); 
	glEnd(); 

	glBindTexture(GL_TEXTURE_2D,texture[1]);
	glBegin(GL_QUADS); 
	// Back Face 
	// Bottom Right Of The Texture and Quad 
	glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f); 
	// Top Right Of The Texture and Quad 
	glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f,  1.0f, -1.0f); 
	// Top Left Of The Texture and Quad 
	glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f,  1.0f, -1.0f); 
	// Bottom Left Of The Texture and Quad 
	glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f); 
	glEnd(); 

	glBindTexture(GL_TEXTURE_2D,texture[2]);
	glBegin(GL_QUADS); 
	// Top Face 
	// Top Left Of The Texture and Quad 
	glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f,  1.0f, -1.0f); 
	// Bottom Left Of The Texture and Quad 
	glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f,  1.0f,  1.0f); 
	// Bottom Right Of The Texture and Quad 
	glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f,  1.0f,  1.0f); 
	// Top Right Of The Texture and Quad 
	glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f,  1.0f, -1.0f); 
	glEnd(); 

	glBindTexture(GL_TEXTURE_2D,texture[3]);
	glBegin(GL_QUADS); 
	// Bottom Face 
	// Top Right Of The Texture and Quad 
	glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, -1.0f, -1.0f); 
	// Top Left Of The Texture and Quad 
	glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, -1.0f, -1.0f); 
	// Bottom Left Of The Texture and Quad 
	glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f,  1.0f); 
	// Bottom Right Of The Texture and Quad 
	glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f,  1.0f); 
	glEnd(); 

	glBindTexture(GL_TEXTURE_2D,texture[4]);
	glBegin(GL_QUADS); 
	// Right face 
	// Bottom Right Of The Texture and Quad 
	glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f); 
	// Top Right Of The Texture and Quad 
	glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f,  1.0f, -1.0f); 
	// Top Left Of The Texture and Quad 
	glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f,  1.0f,  1.0f); 
	// Bottom Left Of The Texture and Quad 
	glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f,  1.0f); 
	glEnd(); 

	glBindTexture(GL_TEXTURE_2D,texture[5]);
	glBegin(GL_QUADS); 
	// Left Face 
	// Bottom Left Of The Texture and Quad 
	glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f); 
	// Bottom Right Of The Texture and Quad 
	glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f,  1.0f); 
	// Top Right Of The Texture and Quad 
	glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f,  1.0f,  1.0f); 
	// Top Left Of The Texture and Quad 
	glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f,  1.0f, -1.0f); 
	glEnd(); 

	/*xRot += 0.3f;
	yRot += 0.4f;
	zRot += 0.5f;*/

	glutSwapBuffers();
}

void reshape(int w,int h)
{
	if (0 == h)
		h = 1;
	
	glViewport(0,0,(GLsizei)w,(GLsizei)h);
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	gluPerspective(60.0f,(GLfloat)w / (GLfloat)h,1,100);
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
}

void keyboard(unsigned char key,int x,int y)
{
	switch(key){
		case 'x':
			xRot += 1.0f;
			glutPostRedisplay();
			break;
		case 'y':
			yRot += 1.0f;
			glutPostRedisplay();
			break;
		case 'z':
			zRot += 1.0f;
			glutPostRedisplay();
			break;
		default:
			break;
	}
}

int main(int argc,char** argv)
{
	glutInit(&argc,argv);
	glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);
	glutInitWindowSize(400,400);
	glutInitWindowPosition(100,100);
	glutCreateWindow("Texture Map");
	init();
	glutDisplayFunc(display);
	glutReshapeFunc(reshape);
	glutKeyboardFunc(keyboard);
	glutMainLoop();
	return 0;
}

运行效果：




正常效果应该是这样子的：

可以看出，有的面上纹理可以看见，但是有的不能看见。所以就乱了~~

这是为什么啊？
求指导~~~~~

[没有昵称阿]

有人能够发现我的问题吗？求指导~~

[没有昵称阿]

[Quote=引用 2 楼 mandera 的回复:]

刚开始研究OPENGL， 是不是需要打开glEnable(GL_DEPTH_TEST) 或者 glEnable(GL_CULL_FACE)？
[/Quote]

不是的。我以及找到问题所在了，是LoadGLTextures函数的返回值的初始化设置错误了~~

[mandera]

刚开始研究OPENGL， 是不是需要打开glEnable(GL_DEPTH_TEST) 或者 glEnable(GL_CULL_FACE)？

[the_venus]

问题出在你没有调用glGenTextures(6,texture);在LoadGLTextures()中的循环前面加上它。并在main()函数的glutMainLoop()函数后面调用glDeleteTextures(6,texture);再看看吧。。。。

[tnb1992]

我试过了，是没有剔除背面的问题
在init函数中加上
glCullFace(GL_BACK);
glEnable(GL_CULL_FACE);
就OK了