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gpu/shaders: be more robust against floating point inaccuracies

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We're forced by compatibility to encode an integer state into a
floating point. Make the implicit conversion from floating point to
integer more robust against GPUs with low precision floats.

Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur
2020-02-29 14:23:26 +01:00
parent 148a2828e7
commit 8405bf0e47
2 changed files with 10 additions and 10 deletions
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gpu/shaders.go
+7 -7
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File diff suppressed because one or more lines are too long
gpu/shaders/stencil.vert
+3 -3
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@@ -29,15 +29,15 @@ void main() {
float maxy = maxy + pathOffset.y; float maxy = maxy + pathOffset.y;
vec2 pos; vec2 pos;
float c = corner; float c = corner;
if (c >= 0.5) { if (c >= 0.375) {
c -= 0.5;
// North. // North.
c -= 0.5;
pos.y = maxy + 1.0; pos.y = maxy + 1.0;
} else { } else {
// South. // South.
pos.y = min(min(from.y, ctrl.y), to.y) - 1.0; pos.y = min(min(from.y, ctrl.y), to.y) - 1.0;
} }
if (c >= 0.25) { if (c >= 0.125) {
// East. // East.
pos.x = max(max(from.x, ctrl.x), to.x)+1.0; pos.x = max(max(from.x, ctrl.x), to.x)+1.0;
} else { } else {