Safari stalls noticeably on gl.bufferData (which reallocates the GPU
buffer) when called multiple times per frame. Replace with a pre-
allocated scratch Float32Array and gl.bufferSubData, which only uploads
new data without reallocating. The GPU buffer is grown with bufferData
only when the scratch outgrows it (amortised doubling). Also eliminate
the per-draw-call `new Float32Array(vertices)` allocation in favour of
scratch.set() + subarray(), removing per-frame GC pressure.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Signed-off-by: Stan Grams <sjg@haxx.space>
Improve WebGL runtime performance by caching/downsampling overview waterfall texture updates and batching marker/dashed-line draws; keep bookmark chips anchored at the top of the waterfall area.\n\nCo-authored-by: OpenAI Codex <codex@openai.com>
Signed-off-by: Stan Grams <sjg@haxx.space>
Replace Canvas2D rendering in spectrum, overview, signal overlay, and CW tone picker with a shared WebGL renderer and wire the new asset into frontend HTTP routes.\n\nCo-authored-by: OpenAI Codex <codex@openai.com>
Signed-off-by: Stan Grams <sjg@haxx.space>
sjg
