title: glBlendEquationSeparate and glBlendFuncSeparate - fragment shader implementation
body: <p>I have OpenGL application which blends colors based on the following settings:</p>
  <pre><code>glBlendEquationSeparate( GL_FUNC_ADD, GL_FUNC_ADD );
  glBlendFuncSeparate( GL_ONE, GL_ONE, GL_ONE, GL_ONE );
  </code></pre>
  <p>In the same way I would like blend two textures in the fragment shader. Does the above blending settings translate to the simple addition:</p>
  <pre><code>vec4 colorA = texture( samplerA, texCoords );
  vec4 colorB = texture( samplerB, texCoords ); 
  vec4 colorC = colorA + colorB;
  </code></pre>
  <p>?</p>