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Display: restore intersection and cusp highlighting

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This increases resource use a bit, because we now have to hold two
fragments in memory at once instead of just one. It's still much better
than holding all of the top twelve fragments, though!
This commit is contained in:
Aaron Fenyes 2024-10-14 16:36:52 -07:00
parent ee1c691787
commit abe231126d
1 changed files with 29 additions and 4 deletions
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37
app-proto/full-interface/src/inversive.frag
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@ -191,19 +191,44 @@ void main() {
// composite the sphere fragments
vec3 color = vec3(0.);
int layer = layer_cnt - 1;
TaggedDepth hit;
for (; layer >= layer_threshold; --layer) {
// shade the current fragment
hit = top_hits[layer];
Fragment frag = sphere_shading(
TaggedDepth hit = top_hits[layer];
Fragment frag_next = sphere_shading(
sphere_list[hit.id],
hit.depth * dir,
hit.dimming * color_list[hit.id]
);
float highlight = highlight_list[hit.id];
float highlight_next = highlight_list[hit.id];
--layer;
for (; layer >= layer_threshold; --layer) {
// load the current fragment
Fragment frag = frag_next;
float highlight = highlight_next;
// shade the next fragment
hit = top_hits[layer];
frag_next = sphere_shading(
sphere_list[hit.id],
hit.depth * dir,
hit.dimming * color_list[hit.id]
);
highlight_next = highlight_list[hit.id];
// highlight intersections
float ixn_dist = intersection_dist(frag, frag_next);
float max_highlight = max(highlight, highlight_next);
float ixn_highlight = 0.5 * max_highlight * (1. - smoothstep(2./3.*ixn_threshold, 1.5*ixn_threshold, ixn_dist));
frag.color = mix(frag.color, vec4(1.), ixn_highlight);
frag_next.color = mix(frag_next.color, vec4(1.), ixn_highlight);
// highlight cusps
float cusp_cos = abs(dot(dir, frag.normal));
float cusp_threshold = 2.*sqrt(ixn_threshold * sphere_list[hit.id].lt.s);
float cusp_highlight = highlight * (1. - smoothstep(2./3.*cusp_threshold, 1.5*cusp_threshold, cusp_cos));
frag.color = mix(frag.color, vec4(1.), cusp_highlight);
// composite the current fragment
color = mix(color, frag.color.rgb, frag.color.a);
}
color = mix(color, frag_next.color.rgb, frag_next.color.a);
outColor = vec4(sRGB(color), 1.);
}