Trac3r-rust/notes/CanvasFrame.txt

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====== CanvasFrame ======

[[/doc/sfml_rust/canvas/canvas_frame/struct.CanvasFrame.html|Documentation]]

===== Details =====

Canvas frame is at it's core, an accumulator of meta data to draw to the screen. 

At the moment it is split up into these groups:

* Colored items like non-textured sprites are just a list of triangles, simple vertices.
@todo
* Textured are grouped by their texture handle. Currently implemented as a list of lists of vertices. I don't think the vertices need to be grouped by sprite as long as they are triangle lists with texture coords included in the definition
* Images are just the same as Textured
* Text is a simple Font->Glyph lookup. XY coords of the font and the ASCII code

{{{code: lang="rust" linenumbers="True"
colored_drawables: Vec<RuntimeVertexDef>
textured_drawables: HashMap<Arc<CanvasTextureHandle>, Vec<Vec<RuntimeVertexDef>>>
image_drawables: HashMap<Arc<CanvasImageHandle>, Vec<Vec<RuntimeVertexDef>>>
text_drawables: HashMap<Arc<CanvasFontHandle>, Vec<GlyphInstance>>
}}}


===== Future =====

I like this immediate interface for this simple style of UI and drawing.

@todo finish this

Now. The CanvasFrame is closely coupled with the Drawable trait, the object which allows CanvasFrame to ingest all drawable object on a single interface

Drawable needs a few things:
	Handle to the Texture or Image it is using
	Vertices describing it
		(vertices will be character data for text)
	Instances?

The handle is queiried and then turned into a descriptor set in the draw_commands.

* What if I pass using function params? But then how do I store???

==== Problem ====
I need to store vectors of multiple unequal types in a vec

vec<vec<T>>

Why can't I pass in 


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===== Data =====

**Borrowed:**

**Owns:**

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