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Mostly deal with problems caused by polygon offset (#15867)

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This commit is contained in:
sfan5
2025-03-16 17:56:32 +01:00
committed by GitHub
parent c07499ccfc
commit 42ac5b2f40
3 changed files with 25 additions and 7 deletions
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13
src/client/tile.cpp
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@@ -21,11 +21,16 @@ void TileLayer::applyMaterialOptions(video::SMaterial &material, int layer) cons
/*
* The second layer is for overlays, but uses the same vertex positions
* as the first, which easily leads to Z-fighting.
* To fix this we can offset the polygons in the direction of the camera.
* To fix this we offset the polygons of the *first layer* away from the camera.
* This only affects the depth buffer and leads to no visual gaps in geometry.
*
* However, doing so intrudes the "Z space" of the overlay of the next node
* so that leads to inconsistent Z-sorting again. :(
* HACK: For lack of a better approach we restrict this to cases where
* an overlay is actually present.
*/
if (layer == 1) {
material.PolygonOffsetSlopeScale = -1;
material.PolygonOffsetDepthBias = -1;
if (need_polygon_offset) {
material.PolygonOffsetSlopeScale = 1;
material.PolygonOffsetDepthBias = 1;
}
}