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OpenGL Reading Pixel Data From Texture

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Anyone know how to read pixel data from a textureId? I have a texture that I've created from the current frame buffer like so:
// Create OpenGL textures
glGenTextures( 1, &textureId );
imageData = ( GLubyte* )malloc( width * height * 4 );
memset( imageData, 0, ( width * height * 4 ) );
if( imageData )
    glBindTexture( GL_TEXTURE_2D, textureId );
    glTexImage2D( GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, imageData );
    free( imageData );
    glBindTexture( GL_TEXTURE_2D, textureId );
    glCopyTexSubImage2D( GL_TEXTURE_2D, 0, 0, 0, 0, 0, width, height );

Once I've copied my current framebufer image to this texture, is it possible to then grab the pixel data at a later time using textureId? Thanks!

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