draw()

void Flint::GPURenderer::draw

(

const std::function< void(RenderQueue &)> &

overlayEmit = {}

)

Execute all queued draw commands in layer and submission order.

Performs the multi-stage draw execution:

1. Sorts submitted drawables by DrawLayer.
2. Constructs a transient RenderQueue bound to FrameData and emits draw geometry.
3. Closes the initial pass and uploads geometry/line VBOs and IBOs to GPU memory.
4. Drains all deferred resource upload callbacks (deferUpload).
5. Re-opens the render pass and dispatches batched geometry, line, and custom draw runs.
6. Clears commands and resets transient frame data storage.