OpenGL的小疑点

OpenGL的小问题
刚学OpenGL，当使用多重采样和颜色索引的时候，就会出现这种情况，我也到网上查了下，无果！！特来请教各位大神啊， 
这里附上代码和问题的描述，劳驾各位呢！！！

view sourceprint?001 #include<stdio.h>  

002 #include<stdlib.h>  

003 #include<GL/glew.h>  

004 #include<GL/glut.h>  

005  

006  

007 static int bgtoggle=1;  

008  

009 void Init()  

010 {  

011 GLint buf,sbuf;  

012 int i,j;  

013 glClearColor(0.0,0.0,0.0,0.0);  

014 glGetIntegerv(GL_SAMPLE_BUFFERS,&buf);  

015 printf("number of sample buffers is %d \n",buf);  

016 glGetIntegerv(GL_SAMPLES,&sbuf);  

017 printf("number of samples is %d \n",sbuf);  

018  

019 glNewList(1,GL_COMPILE);  

020 for(i=0;i<19;i++){  

021 glPushMatrix();  

022 glRotatef(360.0*(float)i/19.0,0.0,0.0,1.0);  

023 glColor3f(1.0,1.0,1.0);  

024 glLineWidth((i/3)+1.0);  

025 glBegin(GL_LINES);  

026 glVertex2f(0.25,0.25);  

027 glVertex2f(0.9,0.2);  

028 glEnd();  

029 glColor3f(0.0,1.0,1.0);  

030 glBegin(GL_TRIANGLES);  

031 glVertex2f(0.25,0.0);  

032 glVertex2f(0.9,0.0);  

033 glVertex2f(0.875,0.10);  

034 glEnd();  

035 glPopMatrix();  

036 }  

037 glEndList();  

038  

039 glNewList(2,GL_COMPILE);  

040 glColor3f(1.0,0.5,0.0);  

041 glBegin(GL_QUADS);  

042 for(i=0;i<16;i++)  

043 for(j=0;j<16;j++)  

044 if((i+i)%2==0){  

045 glVertex2f(-2.0+(i*0.25),-2.0+(j*0.25));  

046 glVertex2f(-2.0+(i*0.25),-1.75+(j*0.25));  

047 glVertex2f(-1.75+(i*0.25),-1.75+(j*0.25));  

048 glVertex2f(-1.75+(i*0.25),-2.0+(j*0.25));  

049 }  

050 glEnd();  

051 glEndList();  

052  

053 }  

054  

055 void display()  

056 {  

057 glClear(GL_COLOR_BUFFER_BIT);  

058  

059 if(bgtoggle)  

060 glCallList(2);  

061 glEnable(GL_MULTISAMPLE);  

062 glPushMatrix();  

063 glTranslatef(-1.0,0.0,0.0);  

064 glCallList(1);  

065 glPopMatrix();  

066  

067 glDisable(GL_MULTISAMPLE);  

068 glPushMatrix();  

069 glTranslatef(1.0,0.0,0.0);  

070 glCallList(1);  

071 glPopMatrix();  

072 glutSwapBuffers();  

073  

074 }  

075  

076 void keyboard(unsigned char key,int x,int y)  

077 {  

078 switch(key){  

079 case 'b':  

080 bgtoggle=!bgtoggle;  

081 glutPostRedisplay();  

082 break;  

083 case 27:  

084 exit(0);  

085 break;  

086 default:  

087 break;  

088 }  

089  

090 }  

091 void reshape(int w,int h)  

092 {  

093 glViewport(0,0,(GLsizei)w,(GLsizei)h);  

094 glMatrixMode(GL_PROJECTION);