我遇到的问题是纹理显示在它前面的纹理。我正在建造一个迷宫，最靠近相机的墙后面的墙壁上的纹理正在显示出来。我该如何解决这个问题？
继承我的代码。
#include <windows.h>
#include <GL/gl.h>
#include <GL/glut.h>
#include <stdio.h>
GLuint texture; //the array for our texture
GLuint sky;
float cameraz = -1.0;
GLuint LoadTexture( const char * filename )
{
GLuint texture;
int width, height;
unsigned char * data;
FILE * file;
int i;
file = fopen( filename, "rb" );
if ( file == NULL ) return 0;
width = 512;
height = 512;
data = (unsigned char *)malloc( width * height * 3 );
//int size = fseek(file,);
fread( data, width * height * 3, 1, file );
fclose( file );
for(i = 0; i < width * height ; ++i)
{
int index = i*3;
unsigned char B,R;
B = data[index];
R = data[index+2];
data[index] = R;
data[index+2] = B;
}
glGenTextures( 1, &texture );
glBindTexture( GL_TEXTURE_2D, texture );
glTexEnvf( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE,GL_MODULATE );
glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,GL_LINEAR_MIPMAP_NEAREST );
glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER,GL_LINEAR );
glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S,GL_REPEAT );
glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T,GL_REPEAT );
gluBuild2DMipmaps( GL_TEXTURE_2D, 3, width, height,GL_RGB, GL_UNSIGNED_BYTE, data );
free( data );
return texture;
}
void FreeTexture( GLuint texture )
{
glDeleteTextures( 1, &texture );
}
/*
void drawBackground()
{
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glOrtho(0, 1, 0, 1, 0, 1);
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glLoadIdentity();
// No depth buffer writes for background.
//glDepthMask( false );
glBindTexture( GL_TEXTURE_2D,sky);
glBegin( GL_QUADS ); {
glTexCoord2f( 0.0f, 0.0f );
glVertex2f( 0.0f, 0.0f );
glTexCoord2f( 0.0f, 1.0f );
glVertex2f( 0.0f, 1.0f );
glTexCoord2f( 1.0f, 1.0f );
glVertex2f( 1.0f, 1.0f );
glTexCoord2f( 1.0f, 0.0f );
glVertex2f( 1.0f, 0.0f );
} glEnd();
//glDepthMask( true );
glPopMatrix();
glMatrixMode(GL_PROJECTION);
glPopMatrix();
glMatrixMode(GL_MODELVIEW);
}*/
void drawMaze (void) {
glBegin(GL_QUADS);
glVertex3d(-500.0, 0, -500.0);
glVertex3d(500.0, 0, -500.0);
glVertex3d(500.0, 0, 500.0);
glVertex3d(-500.0, 0, 500.0);
glPushMatrix();
glBegin (GL_QUADS);
glTexCoord2d(0.0,0.0); glVertex3d(0.0, 0.0, 0.0);
glTexCoord2d(7.0,0.0); glVertex3d(0.0, 0.0, 7.0);
glTexCoord2d(7.0,1.0); glVertex3d(0.0, 1.0, 7.0);
glTexCoord2d(0.0,1.0); glVertex3d(0.0, 1.0, 0.0);
glEnd();
glPopMatrix();
glPushMatrix();
glBegin (GL_QUADS);
glTexCoord2d(0.0,0.0); glVertex3d(0.0, 0.0, 7.0);
glTexCoord2d(4.0,0.0); glVertex3d(4.0, 0.0, 7.0);
glTexCoord2d(4.0,1.0); glVertex3d(4.0, 1.0, 7.0);
glTexCoord2d(0.0,1.0); glVertex3d(0.0, 1.0, 7.0);
glEnd();
glPopMatrix();
glPushMatrix();
glBegin (GL_QUADS);
glTexCoord2d(0.0,0.0); glVertex3d(5.0, 0.0, 7.0);
glTexCoord2d(1.0,0.0); glVertex3d(6.0, 0.0, 7.0);
glTexCoord2d(1.0,1.0); glVertex3d(6.0, 1.0, 7.0);
glTexCoord2d(0.0,1.0); glVertex3d(5.0, 1.0, 7.0);
glEnd();
glPopMatrix();
glPushMatrix();
glBegin (GL_QUADS);
glTexCoord2d(0.0,0.0); glVertex3d(6.0, 0.0, 0.0);
glTexCoord2d(7.0,0.0); glVertex3d(6.0, 0.0, 7.0);
glTexCoord2d(7.0,1.0); glVertex3d(6.0, 1.0, 7.0);
glTexCoord2d(0.0,1.0); glVertex3d(6.0, 1.0, 0.0);
glEnd();
glPopMatrix();
glPushMatrix();
glBegin (GL_QUADS);
glTexCoord2d(0.0,0.0); glVertex3d(1.0, 0.0, 0.0);
glTexCoord2d(5.0,0.0); glVertex3d(6.0, 0.0, 0.0);
glTexCoord2d(5.0,1.0); glVertex3d(6.0, 1.0, 0.0);
glTexCoord2d(0.0,1.0); glVertex3d(1.0, 1.0, 0.0);
glEnd();
glPopMatrix();
glPushMatrix();
glBegin (GL_QUADS);
glTexCoord2d(0.0,0.0); glVertex3d(1.0, 0.0, 0.0);
glTexCoord2d(2.0,0.0); glVertex3d(1.0, 0.0, 2.0);
glTexCoord2d(2.0,1.0); glVertex3d(1.0, 1.0, 2.0);
glTexCoord2d(0.0,1.0); glVertex3d(1.0, 1.0, 0.0);
glEnd();
glPopMatrix();
glPushMatrix();
glBegin (GL_QUADS);
glTexCoord2d(0.0,0.0); glVertex3d(1.0, 0.0, 2.0);
glTexCoord2d(2.0,0.0); glVertex3d(2.0, 0.0, 2.0);
glTexCoord2d(2.0,1.0); glVertex3d(2.0, 1.0, 2.0);
glTexCoord2d(0.0,1.0); glVertex3d(1.0, 1.0, 2.0);
glEnd();
glPopMatrix();
glPushMatrix();
glBegin (GL_QUADS);
glTexCoord2d(0.0,0.0); glVertex3d(3.0, 0.0, 0.0);
glTexCoord2d(1.0,0.0); glVertex3d(3.0, 0.0, 1.0);
glTexCoord2d(1.0,1.0); glVertex3d(3.0, 1.0, 1.0);
glTexCoord2d(0.0,1.0); glVertex3d(3.0, 1.0, 0.0);
glEnd();
glPopMatrix();
glPushMatrix();
glBegin (GL_QUADS);
glTexCoord2d(0.0,0.0); glVertex3d(2.0, 0.0, 1.0);
glTexCoord2d(1.0,0.0); glVertex3d(3.0, 0.0, 1.0);
glTexCoord2d(1.0,1.0); glVertex3d(3.0, 1.0, 1.0);
glTexCoord2d(0.0,1.0); glVertex3d(2.0, 1.0, 1.0);
glEnd();
glPopMatrix();
glPushMatrix();
glBegin (GL_QUADS);
glTexCoord2d(0.0,0.0); glVertex3d(4.0, 0.0, 1.0);
glTexCoord2d(2.0,0.0); glVertex3d(6.0, 0.0, 1.0);
glTexCoord2d(2.0,1.0); glVertex3d(6.0, 1.0, 1.0);
glTexCoord2d(0.0,1.0); glVertex3d(4.0, 1.0, 1.0);
glEnd();
glPopMatrix();
glPushMatrix();
glBegin (GL_QUADS);
glTexCoord2d(0.0,0.0); glVertex3d(3.0, 0.0, 2.0);
glTexCoord2d(2.0,0.0); glVertex3d(5.0, 0.0, 2.0);
glTexCoord2d(2.0,1.0); glVertex3d(5.0, 1.0, 2.0);
glTexCoord2d(0.0,1.0); glVertex3d(3.0, 1.0, 2.0);
glEnd();
glPopMatrix();
glPushMatrix();
glBegin (GL_QUADS);
glTexCoord2d(0.0,0.0); glVertex3d(3.0, 0.0, 2.0);
glTexCoord2d(1.0,0.0); glVertex3d(3.0, 0.0, 3.0);
glTexCoord2d(1.0,1.0); glVertex3d(3.0, 1.0, 3.0);
glTexCoord2d(0.0,1.0); glVertex3d(3.0, 1.0, 2.0);
glEnd();
glPopMatrix();
glPushMatrix();
glBegin (GL_QUADS);
glTexCoord2d(0.0,0.0); glVertex3d(2.0, 0.0, 3.0);
glTexCoord2d(1.0,0.0); glVertex3d(3.0, 0.0, 3.0);
glTexCoord2d(1.0,1.0); glVertex3d(3.0, 1.0, 3.0);
glTexCoord2d(0.0,1.0); glVertex3d(2.0, 1.0, 3.0);
glEnd();
glPopMatrix();
glPushMatrix();
glBegin (GL_QUADS);
glTexCoord2d(0.0,0.0); glVertex3d(2.0, 0.0, 3.0);
glTexCoord2d(1.0,0.0); glVertex3d(2.0, 0.0, 4.0);
glTexCoord2d(1.0,1.0); glVertex3d(2.0, 1.0, 4.0);
glTexCoord2d(0.0,1.0); glVertex3d(2.0, 1.0, 3.0);
glEnd();
glPopMatrix();
glPushMatrix();
glBegin (GL_QUADS);
glTexCoord2d(0.0,0.0); glVertex3d(2.0, 0.0, 4.0);
glTexCoord2d(1.0,0.0); glVertex3d(3.0, 0.0, 4.0);
glTexCoord2d(1.0,1.0); glVertex3d(3.0, 1.0, 4.0);
glTexCoord2d(0.0,1.0); glVertex3d(2.0, 1.0, 4.0);
glEnd();
glPopMatrix();
glPushMatrix();
glBegin (GL_QUADS);
glTexCoord2d(0.0,0.0); glVertex3d(3.0, 0.0, 4.0);
glTexCoord2d(1.0,0.0); glVertex3d(3.0, 0.0, 5.0);
glTexCoord2d(1.0,1.0); glVertex3d(3.0, 1.0, 5.0);
glTexCoord2d(0.0,1.0); glVertex3d(3.0, 1.0, 4.0);
glEnd();
glPopMatrix();
glPushMatrix();
glBegin (GL_QUADS);
glTexCoord2d(0.0,0.0); glVertex3d(1.0, 0.0, 5.0);
glTexCoord2d(2.0,0.0); glVertex3d(3.0, 0.0, 5.0);
glTexCoord2d(2.0,1.0); glVertex3d(3.0, 1.0, 5.0);
glTexCoord2d(0.0,1.0); glVertex3d(1.0, 1.0, 5.0);
glEnd();
glPopMatrix();
glPushMatrix();
glBegin (GL_QUADS);
glTexCoord2d(0.0,0.0); glVertex3d(1.0, 0.0, 3.0);
glTexCoord2d(3.0,0.0); glVertex3d(1.0, 0.0, 6.0);
glTexCoord2d(3.0,1.0); glVertex3d(1.0, 1.0, 6.0);
glTexCoord2d(0.0,1.0); glVertex3d(1.0, 1.0, 3.0);
glEnd();
glPopMatrix();
glPushMatrix();
glBegin (GL_QUADS);
glTexCoord2d(0.0,0.0); glVertex3d(0.0, 0.0, 3.0);
glTexCoord2d(1.0,0.0); glVertex3d(1.0, 0.0, 3.0);
glTexCoord2d(1.0,1.0); glVertex3d(1.0, 1.0, 3.0);
glTexCoord2d(0.0,1.0); glVertex3d(0.0, 1.0, 3.0);
glEnd();
glPopMatrix();
glPushMatrix();
glBegin (GL_QUADS);
glTexCoord2d(0.0,0.0); glVertex3d(4.0, 0.0, 3.0);
glTexCoord2d(2.0,0.0); glVertex3d(6.0, 0.0, 3.0);
glTexCoord2d(2.0,1.0); glVertex3d(6.0, 1.0, 3.0);
glTexCoord2d(0.0,1.0); glVertex3d(4.0, 1.0, 3.0);
glEnd();
glPopMatrix();
glPushMatrix();
glBegin (GL_QUADS);
glTexCoord2d(0.0,0.0); glVertex3d(4.0, 0.0, 3.0);
glTexCoord2d(2.0,0.0); glVertex3d(4.0, 0.0, 5.0);
glTexCoord2d(2.0,1.0); glVertex3d(4.0, 1.0, 5.0);
glTexCoord2d(0.0,1.0); glVertex3d(4.0, 1.0, 3.0);
glEnd();
glPopMatrix();
glPushMatrix();
glBegin (GL_QUADS);
glTexCoord2d(0.0,0.0); glVertex3d(4.0, 0.0, 5.0);
glTexCoord2d(1.0,0.0); glVertex3d(5.0, 0.0, 5.0);
glTexCoord2d(1.0,1.0); glVertex3d(5.0, 1.0, 5.0);
glTexCoord2d(0.0,1.0); glVertex3d(4.0, 1.0, 5.0);
glEnd();
glPopMatrix();
glPushMatrix();
glBegin (GL_QUADS);
glTexCoord2d(0.0,0.0); glVertex3d(5.0, 0.0, 4.0);
glTexCoord2d(1.0,0.0); glVertex3d(6.0, 0.0, 4.0);
glTexCoord2d(1.0,1.0); glVertex3d(6.0, 1.0, 4.0);
glTexCoord2d(0.0,1.0); glVertex3d(5.0, 1.0, 4.0);
glEnd();
glPopMatrix();
glPushMatrix();
glBegin (GL_QUADS);
glTexCoord2d(0.0,0.0); glVertex3d(2.0, 0.0, 6.0);
glTexCoord2d(3.0,0.0); glVertex3d(5.0, 0.0, 6.0);
glTexCoord2d(3.0,1.0); glVertex3d(5.0, 1.0, 6.0);
glTexCoord2d(0.0,1.0); glVertex3d(2.0, 1.0, 6.0);
glEnd();
glPopMatrix();
glPushMatrix();
glBegin (GL_QUADS);
glTexCoord2d(0.0,0.0); glVertex3d(4.0, 0.0, 6.0);
glTexCoord2d(1.0,0.0); glVertex3d(4.0, 0.0, 7.0);
glTexCoord2d(1.0,1.0); glVertex3d(4.0, 1.0, 7.0);
glTexCoord2d(0.0,1.0); glVertex3d(4.0, 1.0, 6.0);
glEnd();
glPopMatrix();
}
void display (void) {
glClearColor (0.0,0.0,0.0,1.0);
glClear (GL_COLOR_BUFFER_BIT);
glLoadIdentity();
glEnable( GL_TEXTURE_2D ); //enable texturing
//glDepthMask(GL_TRUE);
gluLookAt (0.5, 0.5, cameraz, 0.5, 1.0, cameraz + 1.0, 0.0, 1.0, 0.0);
//drawBackground();
drawMaze();
glutSwapBuffers();
}
void reshape (int w, int h) {
glViewport (0, 0, (GLsizei)w, (GLsizei)h);
glMatrixMode (GL_PROJECTION);
glLoadIdentity ();
gluPerspective (60, (GLfloat)w / (GLfloat)h, 1.0, 100.0);
glMatrixMode (GL_MODELVIEW);
}
void arrow_keys ( int a_keys, int x, int y ) // Create Special Function (required for arrow keys)
{
switch ( a_keys ) {
case GLUT_KEY_UP:
cameraz += 0.1;
break;
case GLUT_KEY_DOWN:
cameraz -= 0.1;
break;
case GLUT_KEY_LEFT:
cameraz += 0.1;
break;
case GLUT_KEY_RIGHT:
cameraz += 0.1;
break;
default:
break;
}
}
void init(){
texture = LoadTexture( "wall.bmp" );
//sky = LoadTexture("sky.bmp");
}
int main (int argc, char **argv) {
glutInit (&argc, argv);
glutInitDisplayMode (GLUT_DOUBLE | GLUT_RGBA);
glutInitWindowSize (500, 500);
glutInitWindowPosition (100, 100);
glutCreateWindow ("Mipmaps example");
init();
glutDisplayFunc (display);
glutIdleFunc (display);
glutReshapeFunc (reshape);
glutSpecialFunc ( arrow_keys );
texture = LoadTexture("texture.raw", 256, 256 );
glutMainLoop ();
FreeTexture( texture );
return 0;
}
由于
答案 0 :(得分：1)
首先，在初始化显示时需要请求深度缓冲区：
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA | GLUT_DEPTH);
您还需要在绘制迷宫之前启用深度测试：
glEnable(GL_DEPTH_TEST);
您也可以取消注释glDepthMask(GL_TRUE);，但默认情况下应启用深度编写。