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This replaces header include guards with `#pragma once`.
A couple of include guards are not removed yet (e.g. `__RNA_TYPES_H__`),
because they are used in other places.
This patch has been generated by P1561 followed by `make format`.
Differential Revision: https://developer.blender.org/D8466
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This kind of reverts rBc060a835 that was committed without discussion.
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objects inside the rect
But in the future the selection code may also be used in object mode (eg for snapping).
So to avoid using too much VRAM resources, it is good to avoid drawing all objects in the viewport.
The solution was to create an array with only objects that are detected within the selection area.
If the selection operator is modal, objects already detected are not removed from the array until view3d is moved or orbited.
To detect the object, its BoundBox is tested.
Since the Select Engine does not have a dedicated depth texture, whenever a new object is "found" the depth of the objects in the array already drawn is redrawn.
Reviewers: campbellbarton, fclem
Reviewed By: fclem
Differential Revision: https://developer.blender.org/D5435
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engine internals
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It is easier to deal with private values of the DRW_select engine and gives room for improvement.
Reviewers: campbellbarton, fclem
Differential Revision: https://developer.blender.org/D5415
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