/**
* Enabled by the "outline" option in the render settings, this method generates landscape/objects
* outlines and stores them into a buffer in its own FBO. The stored image is eventually combined
* with others.
*
* <p>The outlines visually separate a given object (including the landscape) or parts of it from
* sufficiently distant objects it overlaps. It is effectively a depth-based edge detection
* technique and internally uses a Sobel operator.
*
* <p>For further information see: http://en.wikipedia.org/wiki/Sobel_operator
*/
public void generateOutline() {
if (renderingConfig.isOutline()) {
materials.outline.enable();
// TODO: verify inputs: shouldn't there be a texture binding here?
buffers.outline.bind();
setViewportTo(buffers.outline.dimensions());
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // TODO: verify this is necessary
renderFullscreenQuad();
graphicState.bindDisplay(); // TODO: verify this is necessary
setViewportToWholeDisplay(); // TODO: verify this is necessary
}
}
