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gpu: eliminate gaps by ensuring consistent transformations

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This is another attempt at fixing the issue described in [0], the
previous attempt was reverted[1].

This change fixes the issue by tracking resolved transformations and
ensure that all segments within a path share a single transformation.

[0] https://github.com/linebender/piet-gpu/issues/62
[1] https://gioui.org/commit/2b21b48a7c5c4451deb642c164548a134bb9ad06

Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur
2021-03-15 09:55:56 +01:00
parent 9cb9e67a8e
commit 258033d0b0
8 changed files with 116 additions and 77 deletions
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gpu/shaders/path_coarse.comp
+11
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@@ -102,6 +102,17 @@ void main() {
case PathSeg_FillCubic:
case PathSeg_StrokeCubic:
PathStrokeCubic cubic = PathSeg_StrokeCubic_read(conf.pathseg_alloc, ref);
uint trans_ix = cubic.trans_ix;
if (trans_ix > 0) {
TransformSegRef trans_ref = TransformSegRef(conf.trans_alloc.offset + (trans_ix - 1) * TransformSeg_size);
TransformSeg trans = TransformSeg_read(conf.trans_alloc, trans_ref);
cubic.p0 = trans.mat.xy * cubic.p0.x + trans.mat.zw * cubic.p0.y + trans.translate;
cubic.p1 = trans.mat.xy * cubic.p1.x + trans.mat.zw * cubic.p1.y + trans.translate;
cubic.p2 = trans.mat.xy * cubic.p2.x + trans.mat.zw * cubic.p2.y + trans.translate;
cubic.p3 = trans.mat.xy * cubic.p3.x + trans.mat.zw * cubic.p3.y + trans.translate;
}
vec2 err_v = 3.0 * (cubic.p2 - cubic.p1) + cubic.p0 - cubic.p3;
float err = err_v.x * err_v.x + err_v.y * err_v.y;
// The number of quadratics.