vega/src/symbols-gl.h, branch masterSurface runtime projecting Pure views across pixel, terminal, CLI, and web.
http://git.yeowoo.org/vega/atom?h=master2026-09-27T12:45:31ZName Vega's parts: lib/, surfaces/ and symbols/2026-09-27T12:45:31Zeunhhunecpition205@gmail.com2026-09-27T12:45:31Zurn:sha1:2920e389f624263efe515d9a5f33f6b822efff5e
src/ held two parts, the surfaces that show modules to people and the
symbol format with its CPU and GPU drawing. As in Pure (design 009), top
level directories are now the parts, and the README says what each builds.
Draw symbols on the GPU from the point table as it is2026-09-27T12:02:41Zeunhhunecpition205@gmail.com2026-09-27T12:02:41Zurn:sha1:ba76d3810713bb67569114e9458416df0f78687a
OpenGL ES 3.1: the file's points go up as one storage buffer, each symbol
gets 16 row bands listing the curves they reach (cut by integer division of
doubled coordinates, so CPU and shader agree), and every pixel of a symbol's
box sums the exact area of its bands' curves, as vega_coverage does.
vega-symbols gpu draws every symbol against the CPU reference and times
1080p pages.
On the Pi 5's V3D it matches the reference (mean 0.001-0.1 levels, worst
4) but takes 142-757 ms a page, 83% of it in the area function. A sorting
network in registers made it 2.3x faster yet computes wrong rows in the
fragment stage with this driver, while the same code is exact in a compute
shader; so drawing each glyph size once into an atlas by compute comes next.