glTexSubImage2D 的用法

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

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_MAG_FILTER,GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST);

glTexEnvi(GL_TEXTURE_ENV,GL_TEXTURE_ENV_MODE,GL_MODULATE);

glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
}

Answer 2

HRESULT hr = pGrab -> GetCurrentBuffer( &n, (long *)pRGB );

glBindTexture(GL_TEXTURE_2D,texture[0]);
glTexSubImage2D (GL_TEXTURE_2D, GL_RGB, 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();

Answer 3

试试替换glTexImage2D产生的纹理。