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a2a2d12c5d
The previous attempt to fix inconsistent intersections because of floating
point inaccuracy[0] missed two cases.
The first case is that for top intersections with the very first row would fail
the test
tag == PathSeg_FillCubic && y > y0 && xbackdrop < bbox.z
In particular, y is not larger than y0 when y0 has been clipped to 0.
Fix that by re-introducing the min(p0.y, p1.y) < tile_y0 check that does work
and is just as consistent. Add similar check, min(p0.x, p1.x) < tile_x0, for
deciding when to clip the segment to the left edge (but keep consistent xray check
for deciding left edge *intersections*).
The second case is that the tracking left intersections in the [xray, next_xray]
range of tiles may fail when next_xray is forced to last_xray, the final xray value.
Fix that case by computing next_xray explicitly, before looping over the
x tiles. The code is now much simpler.
Finally, ensure that xx0 and xx1 doesn't overflow the allocated number of tiles
by clamping them *after* setting them. Adjust xx0 to include xray, just as xx1
is adjusted; I haven't seen corruption without it, but it's not obvious xx0
always includes xray.
While here, replace a "+=" on a guaranteed zero value to just "=".
Updates #23
[0]
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| .. | ||
| annotated.h | ||
| backdrop.comp | ||
| backdrop.spv | ||
| binning.comp | ||
| binning.spv | ||
| bins.h | ||
| build.ninja | ||
| coarse.comp | ||
| coarse.spv | ||
| elements.comp | ||
| elements.spv | ||
| kernel4.comp | ||
| kernel4.spv | ||
| path_coarse.comp | ||
| path_coarse.spv | ||
| pathseg.h | ||
| ptcl.h | ||
| scene.h | ||
| setup.h | ||
| state.h | ||
| tile.h | ||
| tile_alloc.comp | ||
| tile_alloc.spv | ||