Fix T88456: DrawManager: Keep subset RenderMeshData around when geometry does not change.

Reuse loose geometry during selection (and other operations) from
previous calculation. Loose geometry stays the same, but was
recalculated to determine the size of GPU buffers. This patch would
reuse the previous loose geometry when geometry wasn't changed.

Although not the main bottleneck during selection it is measurable.

Master.
`rdata 46ms iter 55ms (frame 410ms)`

This patch.
`rdata 5ms iter 52ms (frame 342ms)`

Reviewed By: mano-wii

Differential Revision: https://developer.blender.org/D11339

1 files changed, 28 insertions, 8 deletions

diff --git a/source/blender/draw/intern/draw_cache_impl_mesh.c b/source/blender/draw/intern/draw_cache_impl_mesh.c
index 8d5fdcc5276..c2dc9b3ad8d 100644
--- a/source/blender/draw/intern/draw_cache_impl_mesh.c
+++ b/source/blender/draw/intern/draw_cache_impl_mesh.c
@@ -707,6 +707,26 @@ void DRW_mesh_batch_cache_dirty_tag(Mesh *me, eMeshBatchDirtyMode mode)
   }
 }
 
+static void mesh_buffer_cache_clear(MeshBufferCache *mbufcache)
+{
+  GPUVertBuf **vbos = (GPUVertBuf **)&mbufcache->vbo;
+  GPUIndexBuf **ibos = (GPUIndexBuf **)&mbufcache->ibo;
+  for (int i = 0; i < sizeof(mbufcache->vbo) / sizeof(void *); i++) {
+    GPU_VERTBUF_DISCARD_SAFE(vbos[i]);
+  }
+  for (int i = 0; i < sizeof(mbufcache->ibo) / sizeof(void *); i++) {
+    GPU_INDEXBUF_DISCARD_SAFE(ibos[i]);
+  }
+}
+
+static void mesh_buffer_extraction_cache_clear(MeshBufferExtractionCache *extraction_cache)
+{
+  MEM_SAFE_FREE(extraction_cache->lverts);
+  MEM_SAFE_FREE(extraction_cache->ledges);
+  extraction_cache->edge_loose_len = 0;
+  extraction_cache->vert_loose_len = 0;
+}
+
 static void mesh_batch_cache_clear(Mesh *me)
 {
   MeshBatchCache *cache = me->runtime.batch_cache;
@@ -714,16 +734,13 @@ static void mesh_batch_cache_clear(Mesh *me)
     return;
   }
   FOREACH_MESH_BUFFER_CACHE (cache, mbufcache) {
-    GPUVertBuf **vbos = (GPUVertBuf **)&mbufcache->vbo;
-    GPUIndexBuf **ibos = (GPUIndexBuf **)&mbufcache->ibo;
-    for (int i = 0; i < sizeof(mbufcache->vbo) / sizeof(void *); i++) {
-      GPU_VERTBUF_DISCARD_SAFE(vbos[i]);
-    }
-    for (int i = 0; i < sizeof(mbufcache->ibo) / sizeof(void *); i++) {
-      GPU_INDEXBUF_DISCARD_SAFE(ibos[i]);
-    }
+    mesh_buffer_cache_clear(mbufcache);
   }
 
+  mesh_buffer_extraction_cache_clear(&cache->final_extraction_cache);
+  mesh_buffer_extraction_cache_clear(&cache->cage_extraction_cache);
+  mesh_buffer_extraction_cache_clear(&cache->uv_cage_extraction_cache);
+
   for (int i = 0; i < cache->mat_len; i++) {
     GPU_INDEXBUF_DISCARD_SAFE(cache->final.tris_per_mat[i]);
   }
@@ -1543,6 +1560,7 @@ void DRW_mesh_batch_cache_create_requested(struct TaskGraph *task_graph,
     mesh_buffer_cache_create_requested(task_graph,
                                        cache,
                                        cache->uv_cage,
+                                       &cache->uv_cage_extraction_cache,
                                        me,
                                        is_editmode,
                                        is_paint_mode,
@@ -1561,6 +1579,7 @@ void DRW_mesh_batch_cache_create_requested(struct TaskGraph *task_graph,
     mesh_buffer_cache_create_requested(task_graph,
                                        cache,
                                        cache->cage,
+                                       &cache->cage_extraction_cache,
                                        me,
                                        is_editmode,
                                        is_paint_mode,
@@ -1578,6 +1597,7 @@ void DRW_mesh_batch_cache_create_requested(struct TaskGraph *task_graph,
   mesh_buffer_cache_create_requested(task_graph,
                                      cache,
                                      cache->final,
+                                     &cache->final_extraction_cache,
                                      me,
                                      is_editmode,
                                      is_paint_mode,