From 6c9ec1c893f98c2349edd3aaae4b606b55b393c9 Mon Sep 17 00:00:00 2001
From: Pablo Dobarro <pablodp606@gmail.com>
Date: Fri, 18 Sep 2020 19:30:02 +0200
Subject: Sculpt: Render Mask and Face Sets with modifiers active

This removes the limitation of the sculpt overlays not being visible
with modifiers active.

Reviewed By: fclem

Maniphest Tasks: T68900

Differential Revision: https://developer.blender.org/D8673
---
 .../blender/draw/intern/draw_cache_extract_mesh.c  | 103 +++++++++++++++++++++
 1 file changed, 103 insertions(+)

(limited to 'source/blender/draw/intern/draw_cache_extract_mesh.c')

diff --git a/source/blender/draw/intern/draw_cache_extract_mesh.c b/source/blender/draw/intern/draw_cache_extract_mesh.c
index cb716b3130a..657cb2061bd 100644
--- a/source/blender/draw/intern/draw_cache_extract_mesh.c
+++ b/source/blender/draw/intern/draw_cache_extract_mesh.c
@@ -53,6 +53,7 @@
 #include "BKE_mesh_tangent.h"
 #include "BKE_modifier.h"
 #include "BKE_object_deform.h"
+#include "BKE_paint.h"
 
 #include "atomic_ops.h"
 
@@ -2564,6 +2565,106 @@ static const MeshExtract extract_tan_hq = {
 
 /** \} */
 
+/* ---------------------------------------------------------------------- */
+/** \name Extract Sculpt Data
+ * \{ */
+
+static void *extract_sculpt_data_init(const MeshRenderData *mr,
+                                      struct MeshBatchCache *UNUSED(cache),
+                                      void *buf)
+{
+  GPUVertFormat format = {0};
+
+  CustomData *cd_ldata = (mr->extract_type == MR_EXTRACT_BMESH) ? &mr->bm->ldata : &mr->me->ldata;
+  CustomData *cd_vdata = (mr->extract_type == MR_EXTRACT_BMESH) ? &mr->bm->vdata : &mr->me->vdata;
+  CustomData *cd_pdata = (mr->extract_type == MR_EXTRACT_BMESH) ? &mr->bm->pdata : &mr->me->pdata;
+
+  float *cd_mask = CustomData_get_layer(cd_vdata, CD_PAINT_MASK);
+  int *cd_face_set = CustomData_get_layer(cd_pdata, CD_SCULPT_FACE_SETS);
+
+  if (format.attr_len == 0) {
+    GPU_vertformat_attr_add(&format, "fset", GPU_COMP_U8, 4, GPU_FETCH_INT_TO_FLOAT_UNIT);
+    GPU_vertformat_attr_add(&format, "msk", GPU_COMP_F32, 1, GPU_FETCH_FLOAT);
+  }
+
+  GPUVertBuf *vbo = buf;
+  GPU_vertbuf_init_with_format(vbo, &format);
+  GPU_vertbuf_data_alloc(vbo, mr->loop_len);
+
+  typedef struct gpuSculptData {
+    uint8_t face_set_color[4];
+    float mask;
+  } gpuSculptData;
+
+  gpuSculptData *vbo_data = (gpuSculptData *)GPU_vertbuf_get_data(vbo);
+  MLoop *loops = CustomData_get_layer(cd_ldata, CD_MLOOP);
+
+  if (mr->extract_type == MR_EXTRACT_BMESH) {
+    int cd_mask_ofs = CustomData_get_offset(cd_vdata, CD_PAINT_MASK);
+    int cd_face_set_ofs = CustomData_get_offset(cd_pdata, CD_SCULPT_FACE_SETS);
+    BMIter f_iter;
+    BMFace *efa;
+    BM_ITER_MESH (efa, &f_iter, mr->bm, BM_FACES_OF_MESH) {
+      BMLoop *l_iter, *l_first;
+      l_iter = l_first = BM_FACE_FIRST_LOOP(efa);
+      do {
+        float v_mask = 0.0f;
+        if (cd_mask) {
+          v_mask = BM_ELEM_CD_GET_FLOAT(l_iter->v, cd_mask_ofs);
+        }
+        vbo_data->mask = v_mask;
+        uchar face_set_color[4] = {UCHAR_MAX, UCHAR_MAX, UCHAR_MAX, UCHAR_MAX};
+        if (cd_face_set) {
+          const int face_set_id = BM_ELEM_CD_GET_INT(l_iter->f, cd_face_set_ofs);
+          if (face_set_id != mr->me->face_sets_color_default) {
+            BKE_paint_face_set_overlay_color_get(
+                face_set_id, mr->me->face_sets_color_seed, face_set_color);
+          }
+        }
+        copy_v3_v3_uchar(vbo_data->face_set_color, face_set_color);
+        vbo_data++;
+      } while ((l_iter = l_iter->next) != l_first);
+    }
+  }
+  else {
+    int mp_loop = 0;
+    for (int mp_index = 0; mp_index < mr->poly_len; mp_index++) {
+      const MPoly *p = &mr->mpoly[mp_index];
+      for (int l = 0; l < p->totloop; l++) {
+        float v_mask = 0.0f;
+        if (cd_mask) {
+          v_mask = cd_mask[loops[mp_loop].v];
+        }
+        vbo_data->mask = v_mask;
+
+        uchar face_set_color[4] = {UCHAR_MAX, UCHAR_MAX, UCHAR_MAX, UCHAR_MAX};
+        if (cd_face_set) {
+          const int face_set_id = cd_face_set[mp_index];
+          /* Skip for the default color Face Set to render it white. */
+          if (face_set_id != mr->me->face_sets_color_default) {
+            BKE_paint_face_set_overlay_color_get(
+                face_set_id, mr->me->face_sets_color_seed, face_set_color);
+          }
+        }
+        copy_v3_v3_uchar(vbo_data->face_set_color, face_set_color);
+        mp_loop++;
+        vbo_data++;
+      }
+    }
+  }
+
+  return NULL;
+}
+
+static const MeshExtract extract_sculpt_data = {
+    .init = extract_sculpt_data_init,
+    .data_flag = 0,
+    /* TODO: enable threading. */
+    .use_threading = false,
+};
+
+/** \} */
+
 /* ---------------------------------------------------------------------- */
 /** \name Extract VCol
  * \{ */
@@ -5598,6 +5699,7 @@ void mesh_buffer_cache_create_requested(struct TaskGraph *task_graph,
   TEST_ASSIGN(VBO, vbo, uv);
   TEST_ASSIGN(VBO, vbo, tan);
   TEST_ASSIGN(VBO, vbo, vcol);
+  TEST_ASSIGN(VBO, vbo, sculpt_data);
   TEST_ASSIGN(VBO, vbo, orco);
   TEST_ASSIGN(VBO, vbo, edge_fac);
   TEST_ASSIGN(VBO, vbo, weights);
@@ -5691,6 +5793,7 @@ void mesh_buffer_cache_create_requested(struct TaskGraph *task_graph,
   EXTRACT(vbo, uv);
   EXTRACT(vbo, tan);
   EXTRACT(vbo, vcol);
+  EXTRACT(vbo, sculpt_data);
   EXTRACT(vbo, orco);
   EXTRACT(vbo, edge_fac);
   EXTRACT(vbo, weights);
-- 
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