Subdiv: CCG, initial grids stitching implementation

Currently is only working on an "inner" grid boundaries.
Need to implement averaging across face edges.

1 files changed, 21 insertions, 0 deletions

diff --git a/source/blender/blenkernel/BKE_subdiv_ccg.h b/source/blender/blenkernel/BKE_subdiv_ccg.h
index ed5ef0e19f5..99037a25a64 100644
--- a/source/blender/blenkernel/BKE_subdiv_ccg.h
+++ b/source/blender/blenkernel/BKE_subdiv_ccg.h
@@ -55,6 +55,18 @@ typedef struct SubdivToCCGSettings {
 	bool need_mask;
 } SubdivToCCGSettings;
 
+/* This is actually a coarse face, which consists of multiple CCG grids. */
+typedef struct SubdivCCGFace {
+	/* Total number of grids in this face.
+	 *
+	 * This 1:1 corresponds to a number of corners (or loops) from a coarse
+	 * face.
+	 */
+	int num_grids;
+	/* Index of first grid from this face in SubdivCCG->grids array. */
+	int start_grid_index;
+} SubdivCCGFace;
+
 /* Representation of subdivision surface which uses CCG grids. */
 typedef struct SubdivCCG {
 	/* This is a subdivision surface this CCG was created for.
@@ -104,6 +116,12 @@ typedef struct SubdivCCG {
 	int normal_offset;
 	int mask_offset;
 
+	/* Faces from which grids are emitted. */
+	int num_faces;
+	SubdivCCGFace *faces;
+	/* Indexed by grid index, points to corresponding face from `faces`. */
+	SubdivCCGFace **grid_faces;
+
 	struct DMFlagMat *grid_flag_mats;
 	BLI_bitmap **grid_hidden;
 
@@ -161,4 +179,7 @@ void BKE_subdiv_ccg_key_top_level(
 /* Recalculate all normals based on grid element coordinates. */
 void BKE_subdiv_ccg_recalc_normals(SubdivCCG *subdiv_ccg);
 
+/* Average grid coordinates and normals along the grid boundatries. */
+void BKE_subdiv_ccg_average_grids(SubdivCCG *subdiv_ccg);
+
 #endif  /* __BKE_SUBDIV_CCG_H__ */