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See commit 386f9652e0169b0aa7f6ead1bf230d5d67d00a38
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addShapeToRegion() impl to utilize OutlineShape -> GLRegion ctor w/ proper buffer-size
This way we avoid unnecessary buffer growth and allow creation of 'always' fitting buffer sizes.
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Update or freshly create the GLRegion, while allocating its buffers with given initial `vertexCount` and `indexCount`.
Method shall be invoked by the addShapeToRegion(GLProfile, GL2ES2) implementation before actually adding the OutlineShape to the GLRegion.
addShapeToRegion(GLProfile, GL2ES2) is capable to determine initial `vertexCount` and `indexCount` buffer sizes,
as it composes the OutlineShapes to be added.
updateGLRegion(GLProfile, GL2ES2, TextureSequence, OutlineShape) maybe used for convenience.
In case GLRegion is `null`, a new instance is being created.
In case the GLRegion already exists, it will be either cleared if the GL2ES2 `gl` instance is not `null`
or earmarked for deletion at a later time and a new instance is being created.
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instead of float[] and remove unused VectorUtil methods
After Matrix4f consolidation and proving same or better performance on non array types,
this enhances code readability, simplifies API, reduces bugs and may improve performance.
GraphUI:
- Have RoundButton as a functional class to make a round or rectangular backdrop,
i.e. impl. addShapeToRegion() via reused addRoundShapeToRegion()
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GL/VK abstraction at a later time differently
Actual GPU rendering toolkit dependency can be abstracted differently, i.e. GPU <- { GL, VK } etc.
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