Drawable Renderer (#1570), Fix stencil IDs on tiles passed to renderTileClippingMasks more than once during a frame

2023-06-07 14:11:14 -07:00
parent d482de1f54
commit bffa77f98c
1 changed files with 9 additions and 2 deletions
--- a/src/mbgl/renderer/paint_parameters.cpp
+++ b/src/mbgl/renderer/paint_parameters.cpp
@@ -149,8 +149,15 @@ void PaintParameters::renderTileClippingMasks(TIter beg, TIter end, GetTileIDFun
    for (auto i = beg; i != end; ++i) {
        const auto& tileID = f(*i);

-        const int32_t stencilID = nextStencilID++;
-        tileClippingMaskIDs.emplace(tileID, stencilID);
+        const int32_t stencilID = nextStencilID + 1;
+        const auto result = tileClippingMaskIDs.insert(std::make_pair(tileID, stencilID));
+        if (result.second) {
+            // inserted
+            nextStencilID++;
+        } else {
+            // already present
+            continue;
+        }

        program->draw(context,
                      *renderPass,