Update meshoptimizer to 0.22

The Godot-specific patch is just a single line now; removing this patch
will likely require adjusting Godot importer code to handle error limits
better.

This also adds new SIMPLIFY_ options; Godot is currently not using any
of these but might use SIMPLIFY_PRUNE and SIMPLIFY_SPARSE in the future.

2 files changed, 8 insertions, 1 deletions

diff --git a/scene/resources/3d/importer_mesh.cpp b/scene/resources/3d/importer_mesh.cpp
index 47cd64f19a..fa2532a310 100644
--- a/scene/resources/3d/importer_mesh.cpp
+++ b/scene/resources/3d/importer_mesh.cpp
@@ -503,6 +503,7 @@ void ImporterMesh::generate_lods(float p_normal_merge_angle, float p_normal_spli
 					merged_normals_f32.ptr(),
 					sizeof(float) * 3, // Attribute stride
 					normal_weights, 3,
+					nullptr, // Vertex lock
 					index_target,
 					max_mesh_error,
 					simplify_options,
diff --git a/scene/resources/surface_tool.h b/scene/resources/surface_tool.h
index a072df5bee..5200eba2a8 100644
--- a/scene/resources/surface_tool.h
+++ b/scene/resources/surface_tool.h
@@ -80,13 +80,19 @@ public:
 	enum {
 		/* Do not move vertices that are located on the topological border (vertices on triangle edges that don't have a paired triangle). Useful for simplifying portions of the larger mesh. */
 		SIMPLIFY_LOCK_BORDER = 1 << 0, // From meshopt_SimplifyLockBorder
+		/* Improve simplification performance assuming input indices are a sparse subset of the mesh. Note that error becomes relative to subset extents. */
+		SIMPLIFY_SPARSE = 1 << 1, // From meshopt_SimplifySparse
+		/* Treat error limit and resulting error as absolute instead of relative to mesh extents. */
+		SIMPLIFY_ERROR_ABSOLUTE = 1 << 2, // From meshopt_SimplifyErrorAbsolute
+		/* Remove disconnected parts of the mesh during simplification incrementally, regardless of the topological restrictions inside components. */
+		SIMPLIFY_PRUNE = 1 << 3, // From meshopt_SimplifyPrune
 	};
 
 	typedef void (*OptimizeVertexCacheFunc)(unsigned int *destination, const unsigned int *indices, size_t index_count, size_t vertex_count);
 	static OptimizeVertexCacheFunc optimize_vertex_cache_func;
 	typedef size_t (*SimplifyFunc)(unsigned int *destination, const unsigned int *indices, size_t index_count, const float *vertex_positions, size_t vertex_count, size_t vertex_positions_stride, size_t target_index_count, float target_error, unsigned int options, float *r_error);
 	static SimplifyFunc simplify_func;
-	typedef size_t (*SimplifyWithAttribFunc)(unsigned int *destination, const unsigned int *indices, size_t index_count, const float *vertex_data, size_t vertex_count, size_t vertex_stride, const float *attributes, size_t attribute_stride, const float *attribute_weights, size_t attribute_count, size_t target_index_count, float target_error, unsigned int options, float *result_error);
+	typedef size_t (*SimplifyWithAttribFunc)(unsigned int *destination, const unsigned int *indices, size_t index_count, const float *vertex_data, size_t vertex_count, size_t vertex_stride, const float *attributes, size_t attribute_stride, const float *attribute_weights, size_t attribute_count, const unsigned char *vertex_lock, size_t target_index_count, float target_error, unsigned int options, float *result_error);
 	static SimplifyWithAttribFunc simplify_with_attrib_func;
 	typedef float (*SimplifyScaleFunc)(const float *vertex_positions, size_t vertex_count, size_t vertex_positions_stride);
 	static SimplifyScaleFunc simplify_scale_func;