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GPU: Keep spline/bezier tessellation from reaching zero

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Reduce only the larger factor when over the vertex limit, and stop at 1.

Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>
This commit is contained in:
Henrik RydgårdandClaude Opus 5.5 committed 2026-09-29 13:16:40 -06:00
1 parent 9d3022642b
commit 4c2086aac5
1 file changed
+13 -6
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GPU/Common/SplineCommon.h
+13 -6
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@@ -68,6 +68,15 @@ struct SurfaceInfo {
break;
}
}
// Only the larger factor, so a lopsided patch keeps at least one step along its short axis.
void ReduceLargerTess() {
if (tess_u >= tess_v) {
tess_u--;
} else {
tess_v--;
}
}
};
struct BezierSurface : public SurfaceInfo {
@@ -78,9 +87,8 @@ struct BezierSurface : public SurfaceInfo {
void Init(int maxVertices) {
SurfaceInfo::BaseInit();
// Downsample until it fits, in case crazy tessellation factors are sent.
while ((tess_u + 1) * (tess_v + 1) * num_patches_u * num_patches_v > maxVertices) {
tess_u--;
tess_v--;
while ((tess_u + 1) * (tess_v + 1) * num_patches_u * num_patches_v > maxVertices && (tess_u > 1 || tess_v > 1)) {
ReduceLargerTess();
}
num_verts_per_patch = (tess_u + 1) * (tess_v + 1);
}
@@ -116,9 +124,8 @@ struct SplineSurface : public SurfaceInfo {
void Init(int maxVertices) {
SurfaceInfo::BaseInit();
// Downsample until it fits, in case crazy tessellation factors are sent.
while ((num_patches_u * tess_u + 1) * (num_patches_v * tess_v + 1) > maxVertices) {
tess_u--;
tess_v--;
while ((num_patches_u * tess_u + 1) * (num_patches_v * tess_v + 1) > maxVertices && (tess_u > 1 || tess_v > 1)) {
ReduceLargerTess();
}
num_vertices_u = num_patches_u * tess_u + 1;
}