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Author SHA1 Message Date
Emmanuele Bassi
e3cbec48a8 paint-node: Initialize ClutterPaintOperation
Don't leave it to the compiler.
2012-03-20 16:19:23 +00:00
Emmanuele Bassi
1df14c1bac Debugging cleanups
Add some more debugging notes to the layout and paint node output.
2012-03-16 16:16:40 +00:00
Emmanuele Bassi
8904f7cbe4 paint-nodes: Make part of the API internal
At least for the time being, we only expose the parts of the API that we
want to use internally and for new, out-of-tree Content implementations.

The full PaintNode tree API will be made public in 1.12 once we branch
master.
2012-03-16 12:33:40 +00:00
Emmanuele Bassi
f4d8fb054a paint-node: Use JSON-GLib for debug serialization
Instead of our homegrown string building; this at least ensures that
we're generating proper data, instead of random strings. Plus, using
JsonNode and JsonBuilder, we can ask the PaintNode subclasses to
serialize themselves in a sensible way.
2012-03-16 12:33:36 +00:00
Emmanuele Bassi
b83dc6abfa Add PaintNode, an element on the render object tree
Now that we have a proper scene graph API, we should split out the
rendering part from the logical and event handling part.

ClutterPaintNode is a lightweight fundamental type that encodes only the
paint operations: pipeline state and geometry. At its most simple, is a
way to structure setting up the programmable pipeline using a
CoglPipeline, and submitting Cogl primitives. The important take away
from this API is that you are not allowed to call Cogl API like
cogl_set_source() or cogl_primitive_draw() directly.

The interesting approach to this is that, in the future, we should be
able to move to a purely retained mode: we will decide which actors need
to be painted, they will update their own branch of the render graph,
and we'll take the render graph and build all the rendering commands
from that.

For the 1.x API, we will have to maintain invariants and the existing
behaviour, but as soon as we can break API, the old paint signal will
just go away, and Actors will only be allowed to manipulate the render
tree.
2012-03-16 12:33:35 +00:00