1 files changed, 127 insertions, 0 deletions
diff --git a/source/blender/draw/intern/mesh_extractors/extract_mesh_vbo_fdots_uv.cc b/source/blender/draw/intern/mesh_extractors/extract_mesh_vbo_fdots_uv.cc
new file mode 100644
index 00000000000..0289fd63a30
--- /dev/null
+++ b/source/blender/draw/intern/mesh_extractors/extract_mesh_vbo_fdots_uv.cc
@@ -0,0 +1,127 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * The Original Code is Copyright (C) 2021 by Blender Foundation.
+ * All rights reserved.
+ */
+
+/** \file
+ * \ingroup draw
+ */
+
+#include "draw_cache_extract_mesh_private.h"
+
+namespace blender::draw {
+
+/* ---------------------------------------------------------------------- */
+/** \name Extract Face-dots UV
+ * \{ */
+
+struct MeshExtract_FdotUV_Data {
+  float (*vbo_data)[2];
+  MLoopUV *uv_data;
+  int cd_ofs;
+};
+
+static void extract_fdots_uv_init(const MeshRenderData *mr,
+                                  struct MeshBatchCache *UNUSED(cache),
+                                  void *buf,
+                                  void *tls_data)
+{
+  GPUVertBuf *vbo = static_cast<GPUVertBuf *>(buf);
+  static GPUVertFormat format = {0};
+  if (format.attr_len == 0) {
+    GPU_vertformat_attr_add(&format, "u", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
+    GPU_vertformat_alias_add(&format, "au");
+    GPU_vertformat_alias_add(&format, "pos");
+  }
+
+  GPU_vertbuf_init_with_format(vbo, &format);
+  GPU_vertbuf_data_alloc(vbo, mr->poly_len);
+
+  if (!mr->use_subsurf_fdots) {
+    /* Clear so we can accumulate on it. */
+    memset(GPU_vertbuf_get_data(vbo), 0x0, mr->poly_len * GPU_vertbuf_get_format(vbo)->stride);
+  }
+
+  MeshExtract_FdotUV_Data *data = static_cast<MeshExtract_FdotUV_Data *>(tls_data);
+  data->vbo_data = (float(*)[2])GPU_vertbuf_get_data(vbo);
+
+  if (mr->extract_type == MR_EXTRACT_BMESH) {
+    data->cd_ofs = CustomData_get_offset(&mr->bm->ldata, CD_MLOOPUV);
+  }
+  else {
+    data->uv_data = (MLoopUV *)CustomData_get_layer(&mr->me->ldata, CD_MLOOPUV);
+  }
+}
+
+static void extract_fdots_uv_iter_poly_bm(const MeshRenderData *UNUSED(mr),
+                                          const BMFace *f,
+                                          const int UNUSED(f_index),
+                                          void *_data)
+{
+  MeshExtract_FdotUV_Data *data = static_cast<MeshExtract_FdotUV_Data *>(_data);
+  BMLoop *l_iter, *l_first;
+  l_iter = l_first = BM_FACE_FIRST_LOOP(f);
+  do {
+    float w = 1.0f / (float)f->len;
+    const MLoopUV *luv = (const MLoopUV *)BM_ELEM_CD_GET_VOID_P(l_iter, data->cd_ofs);
+    madd_v2_v2fl(data->vbo_data[BM_elem_index_get(f)], luv->uv, w);
+  } while ((l_iter = l_iter->next) != l_first);
+}
+
+static void extract_fdots_uv_iter_poly_mesh(const MeshRenderData *mr,
+                                            const MPoly *mp,
+                                            const int mp_index,
+                                            void *_data)
+{
+  MeshExtract_FdotUV_Data *data = static_cast<MeshExtract_FdotUV_Data *>(_data);
+  const MLoop *mloop = mr->mloop;
+  const int ml_index_end = mp->loopstart + mp->totloop;
+  for (int ml_index = mp->loopstart; ml_index < ml_index_end; ml_index += 1) {
+    const MLoop *ml = &mloop[ml_index];
+    if (mr->use_subsurf_fdots) {
+      const MVert *mv = &mr->mvert[ml->v];
+      if (mv->flag & ME_VERT_FACEDOT) {
+        copy_v2_v2(data->vbo_data[mp_index], data->uv_data[ml_index].uv);
+      }
+    }
+    else {
+      float w = 1.0f / (float)mp->totloop;
+      madd_v2_v2fl(data->vbo_data[mp_index], data->uv_data[ml_index].uv, w);
+    }
+  }
+}
+
+constexpr MeshExtract create_extractor_fdots_uv()
+{
+  MeshExtract extractor = {nullptr};
+  extractor.init = extract_fdots_uv_init;
+  extractor.iter_poly_bm = extract_fdots_uv_iter_poly_bm;
+  extractor.iter_poly_mesh = extract_fdots_uv_iter_poly_mesh;
+  extractor.data_type = MR_DATA_NONE;
+  extractor.data_size = sizeof(MeshExtract_FdotUV_Data);
+  extractor.use_threading = true;
+  extractor.mesh_buffer_offset = offsetof(MeshBufferCache, vbo.fdots_uv);
+  return extractor;
+}
+
+/** \} */
+
+}  // namespace blender::draw
+
+extern "C" {
+const MeshExtract extract_fdots_uv = blender::draw::create_extractor_fdots_uv();
+}