C 线条和纹理不会同时显示

C 线条和纹理不会同时显示,c,opengl,C,Opengl,这是我画线的方法,我用鼠标画线 static struct { GLfloat p[MAX_POINTS][2]; GLuint point_cnt; } contours [ MAX_CONTOURS ] ; GLuint point_cnt_mouse; point_cnt_mouse = contours[contour_cnt].point_cnt; glColor3f( 0.0, 0.0, 0.0 ); glBegin(GL_LINES); glLineWidth(5.0)

这是我画线的方法,我用鼠标画线

static struct
{
  GLfloat p[MAX_POINTS][2];
  GLuint point_cnt;
} contours [ MAX_CONTOURS ] ;


GLuint point_cnt_mouse;
point_cnt_mouse = contours[contour_cnt].point_cnt;
glColor3f( 0.0, 0.0, 0.0 );
glBegin(GL_LINES);
glLineWidth(5.0);
int i;
int j;
for(i = 0; i <= contour_cnt; i++)
{
  GLuint point_cnt;
  point_cnt = contours[i].point_cnt;
  if (contours[i].point_cnt == 0)
  {
    glVertex2fv ( P );
    glVertex2fv ( P );
  }//if   
  else
  {
    for(j = 2; j <= point_cnt; j++)
    {
      glVertex2fv (contours[i].p[j-2]);
      glVertex2fv (contours[i].p[j-1]);               
    }//for                
  }//else
}//for
if(point_cnt_mouse > 0)
{
  glVertex2fv(contours[contour_cnt].p[point_cnt_mouse-1]);
  glVertex2fv(P);
}//if  
glEnd();

徽标不会显示线条,为什么?有人能告诉我代码出了什么问题吗?

我觉得你的
display()
函数从未调用
drawLogo()


在绘制线条之前,请确保禁用纹理(
glDisable(GL\u TEXTURE\u 2D)
)。并在绘制纹理之前重新启用(
glEnable(GL_TEXTURE_2D)


如果使用默认的
GL_MODULATE
纹理环境,请确保在使用纹理绘制之前将当前颜色设置为白色(
glColor3ub(255255255)
)。如果在线条例程中,在
glColor3f(0.0,0.0,0.0)
之后绘制纹理,那么
GL\u MODULATE
将把所有的texel RGB值乘以零,让你到处都是黑色。

如果我使用glDisable(GL\u texture\u 2D),纹理将消失实际上我有drawPlane(),这意味着在这个平面上绘制纹理。My drawLogo()正在将png图像加载到openGL。void drawPlane(){glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);glBegin(GL_四边形);glTexCoord2f(0.0,0.0);glVertex3f(-1.0,-1.0,0.0);glTexCoord2f(-1.0,1.0);glvertexcoord2f(1.0,1.0,0.0);glTexCoord2f(1.0,0);glvertex(1.0,-1.0,0.0);printf(“malegebbide鼠标的坐标, %d-0--0->%d\n“,a,b);glEnd();}是线条显示时没有徽标,还是徽标显示时没有线条?
void display()
{
  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  glLoadIdentity();
  glPushMatrix ();     
    glTranslatef(-4.0, 5.0, -6.0);
    //this is box and load texture on it
    drawPlane();
  glPopMatrix();
  glutSwapBuffers();
  glFlush();
  }

void myinit()
{
  glClearColor(1.0, 1.0, 1.0, 1.0);
  glEnable(GL_DEPTH_TEST);
  //load png image 
  drawLogo();
  glDisable(GL_DEPTH_TEST);
}
void display()
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glLoadIdentity();
    glPushMatrix ();     
    glTranslatef(-4.0, 5.0, -6.0);
    //this is box and load texture on it
    drawPlane();
    glPopMatrix();
    glutSwapBuffers();
    glFlush();
}