Texture Rotation

OpenGL OpenGL: Basic Coding
1

I was wondering howto rotate my texture around its center and not the lower left corner that it does now with this code:

glMatrixMode(GL_TEXTURE);
glLoadIdentity();
glRotatef(x, 0.0f, 0.0f, 1.0f);
glMatrixMode(GL_MODELVIEW);

2

This should make the texture rotate around (0.5, 0.5):

glMatrixMode(GL_TEXTURE);
glLoadIdentity();
glTranslate(0.5, 0.5, 0.5);  // z is not really relevant
glRotatef(x, 0.0f, 0.0f, 1.0f);
glTranslate(-0.5, -0.5, -0.5);
glMatrixMode(GL_MODELVIEW);