use a shared object with multiple length keys to store regl buffers

[bmschmidt]

Previously deepscatter had something called a TileBufferManager. This doesn't make a huge amount of sense, and had a concrete cost; if two tiles used the same underlying Arrow memory for a column (say, 2**16 floating point zeros), then we'd use different memory on the GPU for them.

This PR revamps that storage so that it uses the new TupleMap class. There is a single shared buffer manager across the whole plot, which uses a key that includes the tile itself and then the string name of the field desired (which is now actually string[], for help in the next PR.)

This map associates each column with its underlying Arrow vector memory, and it is that memory that is used as a key to the GPU buffers. This is a little weird, but the two-step operation means taht we can re-use memory more efficiently.

At some later point I'll more fully build on this. One goal is that for four types of floating point data we can always use a single webGL buffer instead of re-allocating them ad-infinitum:

All-false (or all-zero in float32 land)
All-true (or all-one in float32 land)
Nth-item-true, rest false (by creating a big array with a one in the middle at position K, and starting the view of that buffer at position K-N.
Nth-item-false, rest true (inverse of number 3).

---

Important

Introduces BufferManager for efficient GPU buffer management in regl_rendering.ts, replacing TileBufferManager, and updates rendering logic in ReglRenderer.

• Buffer Management:
  • Introduced BufferManager in regl_rendering.ts to replace TileBufferManager for managing GPU buffers.
  • Uses TupleMap to associate Arrow vector memory with GPU buffers, allowing shared buffer management across the plot.
  • BufferManager handles buffer creation and memory reuse, improving efficiency.
• Rendering Changes:
  • Updated ReglRenderer to use BufferManager for buffer management.
  • Adjusted buffer handling logic in render_points() and remake_renderer().
• Miscellaneous:
  • Removed 'observable10' from color schemes in ColorChange.svelte.

^{This description was created by for 5903dbd. It will automatically update as commits are pushed.}

[bmschmidt]

• uv for quadfeather #154
• allow subfield access #153
• use a shared object with multiple length keys to store regl buffers #152 👈
• main

This stack of pull requests is managed by Graphite. Learn more about stacking.

Join @bmschmidt and the rest of your teammates on Graphite

[ellipsis-dev]

The import 'buffer' from 'd3' is unused and can be removed to clean up the code.

[ellipsis-dev]

Deleting a column from a tile does not free GPU memory. Consider implementing a mechanism to release GPU resources when a column is deleted.