[Simn]

MemoryManager.getQuadIndexes decides whether the existing 32-bit quad indexes are large enough by comparing their index count with the vertex count:

if( quadIndexes32 == null || quadIndexes32.count < vertices ) {

but a quad needs 6 indexes for 4 vertices, and the number of indexes needed is already computed as nquads. So the check passes when it shouldn't. For example:

1. A quad buffer of 65536 vertices is drawn: indexes are built for sz = 131072 indexes, i.e. 21845 quads.
2. A buffer of 131072 vertices (32768 quads) is drawn: 131072 < 131072 is false, so those indexes are kept.
3. renderQuadBuffer with more than 21845 quads then reads past the index data, and the quads beyond it aren't drawn, without any error.

The fix compares with nquads. Triangle indexes (getTriIndexes) use one index per vertex, so their check is correct.

Tested with DirectX 11: drawing 15000, then 22000, then 40000 quads from one growing Dynamic buffer through renderQuadBuffer; without the fix the last quads of the 22000 aren't drawn, with it all are.

🤖 Generated with Claude Code