关于gluBuild2DMipmaps和glTexSubImage2D

Question

我现在是用gluBuild2DMipmaps产生了  纹理数据，用glTexSubImage2D替换以后没有变化  就是说  替换以后还是以前的纹理数据，请教是怎么会事呢  谢谢

Answer 1

glClearColor(0.0f,0.0f,0.0f,0.0f);
glShadeModel(GL_SMOOTH);
glClearDepth(1.0f) ;
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LEQUAL);

glEnable(GL_CULL_FACE);
glFrontFace(GL_CCW);
glEnable(GL_TEXTURE_2D); glGenTextures(5,texture);
for(int i=0;i<5;i++)
{
pRGB1=LoadBitmapFile(szfileName[i],&bih); if(!pRGB1)
return; glBindTexture(GL_TEXTURE_2D,texture[i]); gluBuild2DMipmaps(GL_TEXTURE_2D, GL_RGB, bih.biWidth, bih.biHeight, GL_RGB, GL_UNSIGNED_BYTE,pRGB1);

glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);

glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST);
//glTexParameteri(GL_TEXTURE_2D,GL_GENERATE_MIPMAP,GL_TRUE);

glTexEnvi(GL_TEXTURE_ENV,GL_TEXTURE_ENV_MODE,GL_MODULATE);

glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
}
int i=0;
int j=0;
HRESULT hr = pGrab -> GetCurrentBuffer( &n, (long *)pRGB );

glBindTexture(GL_TEXTURE_2D,texture[0]);
glTexSubImage2D (GL_TEXTURE_2D, 0, 0, 0, bih1.biWidth, bih1.biHeight, GL_RGB, GL_UNSIGNED_BYTE, pRGB); glPushMatrix();
glBegin(GL_QUADS);
glTexCoord2f(0.0f,0.0f);glVertex2f(-windowWidth,-windowHeight);
glTexCoord2f(1.0f,0.0f);glVertex2f(windowWidth,-windowHeight);
glTexCoord2f(1.0f,1.0f);glVertex2f(windowWidth,windowHeight);
glTexCoord2f(0.0f,1.0f);glVertex2f(-windowWidth,windowHeight);
glEnd();
glPopMatrix(); for(i=0;i<20;i++)
{
j++;
if(j>4)
j=1;
glBindTexture(GL_TEXTURE_2D,texture[j]); tex1[i].Rende(1.0f,-370.0f+80.0*i,height,angle);
} height-=1.0;
if(height<-300.0f)
height=300.0f;
angle+=1;
if(angle>360.0f)
angle=0.0f;

Answer 2

gluBuild2DMipmaps改成glTexImage2D，行吗？