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Clément Foucault ffd5e1e6ac Eevee: Use manual derivatives for better quality bump. ...

We basically duplicate the height map branch plugged into the bump node,
and tag each node in each branch as dx/dy/ref using `branch_tag`.

Then we add a one pixel offset on the texture coordinates if the node is
tagged as dx or dy.

The dx/dy branches are plugged into (new) hidden sockets on the bump node.

This match cycles bump better but have a performance impact. Also, complex
nodetrees can now become instruction limited and not compile anymore.

Reviewers: brecht

Differential Revision: https://developer.blender.org/D5531

2019-09-06 16:59:15 +02:00

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