title: set the texture for by glUniform1i
body: <p>I have a question about how to set the texture by <code>glUniform1i</code>. I have seen code like below.</p>
  
  <pre><code>glActiveTexture(GL_TEXTURE0); 
  glBindTexture(GL_TEXTURE_2D, texture0);
  glUniform1i(_textureUniform, 0);
  glActiveTexture(GL_TEXTURE1); 
  glBindTexture(GL_TEXTURE_2D, texture1);
  glUniform1i(_textureUniform, 1);
  </code></pre>
  
  <p>Does it mean, if I use the number <code>i</code> in the <code>glUniform1i</code>, then I have to use <code>glActiveTexture(GL_TEXTURE **i** )</code>?</p>