Cleanup: deduplicate GPU subdiv data extraction loops

This puts the loop over the final subdivision quads outside of the mesh
iteration callback. This can also allow for easier parallel execution in
the future if need be.

1 files changed, 5 insertions, 2 deletions

diff --git a/source/blender/draw/intern/mesh_extractors/extract_mesh_vbo_edituv_data.cc b/source/blender/draw/intern/mesh_extractors/extract_mesh_vbo_edituv_data.cc
index 067d482bc2b..b1866708d14 100644
--- a/source/blender/draw/intern/mesh_extractors/extract_mesh_vbo_edituv_data.cc
+++ b/source/blender/draw/intern/mesh_extractors/extract_mesh_vbo_edituv_data.cc
@@ -141,14 +141,17 @@ static void extract_edituv_data_init_subdiv(const DRWSubdivCache *subdiv_cache,
 
 static void extract_edituv_data_iter_subdiv(const DRWSubdivCache *subdiv_cache,
                                             const MeshRenderData *mr,
-                                            void *_data)
+                                            void *_data,
+                                            uint subdiv_quad_index)
 {
   MeshExtract_EditUVData_Data *data = static_cast<MeshExtract_EditUVData_Data *>(_data);
   int *subdiv_loop_vert_index = (int *)GPU_vertbuf_get_data(subdiv_cache->verts_orig_index);
   int *subdiv_loop_edge_index = (int *)GPU_vertbuf_get_data(subdiv_cache->edges_orig_index);
   int *subdiv_loop_poly_index = subdiv_cache->subdiv_loop_poly_index;
 
-  for (uint i = 0; i < subdiv_cache->num_subdiv_loops; i++) {
+  uint start_loop_idx = subdiv_quad_index * 4;
+  uint end_loop_idx = (subdiv_quad_index + 1) * 4;
+  for (uint i = start_loop_idx; i < end_loop_idx; i++) {
     const int vert_origindex = subdiv_loop_vert_index[i];
     const int edge_origindex = subdiv_loop_edge_index[i];
     const int poly_origindex = subdiv_loop_poly_index[i];