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-rw-r--r--thirdparty/meshoptimizer/simplifier.cpp16
1 files changed, 11 insertions, 5 deletions
diff --git a/thirdparty/meshoptimizer/simplifier.cpp b/thirdparty/meshoptimizer/simplifier.cpp
index 059cabb055..0f10ebef4b 100644
--- a/thirdparty/meshoptimizer/simplifier.cpp
+++ b/thirdparty/meshoptimizer/simplifier.cpp
@@ -120,8 +120,13 @@ struct PositionHasher
{
const unsigned int* key = reinterpret_cast<const unsigned int*>(vertex_positions + index * vertex_stride_float);
+ // scramble bits to make sure that integer coordinates have entropy in lower bits
+ unsigned int x = key[0] ^ (key[0] >> 17);
+ unsigned int y = key[1] ^ (key[1] >> 17);
+ unsigned int z = key[2] ^ (key[2] >> 17);
+
// Optimized Spatial Hashing for Collision Detection of Deformable Objects
- return (key[0] * 73856093) ^ (key[1] * 19349663) ^ (key[2] * 83492791);
+ return (x * 73856093) ^ (y * 19349663) ^ (z * 83492791);
}
bool equal(unsigned int lhs, unsigned int rhs) const
@@ -1160,7 +1165,7 @@ struct IdHasher
struct TriangleHasher
{
- unsigned int* indices;
+ const unsigned int* indices;
size_t hash(unsigned int i) const
{
@@ -1375,9 +1380,10 @@ static float interpolate(float y, float x0, float y0, float x1, float y1, float
} // namespace meshopt
#ifndef NDEBUG
-unsigned char* meshopt_simplifyDebugKind = 0;
-unsigned int* meshopt_simplifyDebugLoop = 0;
-unsigned int* meshopt_simplifyDebugLoopBack = 0;
+// Note: this is only exposed for debug visualization purposes; do *not* use these in debug builds
+MESHOPTIMIZER_API unsigned char* meshopt_simplifyDebugKind = 0;
+MESHOPTIMIZER_API unsigned int* meshopt_simplifyDebugLoop = 0;
+MESHOPTIMIZER_API unsigned int* meshopt_simplifyDebugLoopBack = 0;
#endif
size_t meshopt_simplify(unsigned int* destination, const unsigned int* indices, size_t index_count, const float* vertex_positions_data, size_t vertex_count, size_t vertex_positions_stride, size_t target_index_count, float target_error, float* out_result_error)