OpenSubdiv: Completely avoid possible access to non-existing CPU data

Make it so CCGDM reports 0 number of geometry when it uses GPU backend for
drawing. This screws up a bit statistics in info header and requires to have
some special handle of CCGDM in the drawing code, but makes it so non of the
areas will try to access non-existing geometry.

1 files changed, 16 insertions, 1 deletions

diff --git a/source/blender/blenkernel/intern/CCGSubSurf.c b/source/blender/blenkernel/intern/CCGSubSurf.c
index bd5ddba9590..95ddb9d5498 100644
--- a/source/blender/blenkernel/intern/CCGSubSurf.c
+++ b/source/blender/blenkernel/intern/CCGSubSurf.c
@@ -1515,6 +1515,12 @@ int ccgSubSurf_getNumFinalVerts(const CCGSubSurf *ss)
 	                     ss->fMap->numEntries +
 	                     ss->numGrids * ((gridSize - 2) + ((gridSize - 2) * (gridSize - 2))));
 
+#ifdef WITH_OPENSUBDIV
+	if (ss->skip_grids) {
+		return 0;
+	}
+#endif
+
 	return numFinalVerts;
 }
 int ccgSubSurf_getNumFinalEdges(const CCGSubSurf *ss)
@@ -1523,13 +1529,22 @@ int ccgSubSurf_getNumFinalEdges(const CCGSubSurf *ss)
 	int gridSize = ccg_gridsize(ss->subdivLevels);
 	int numFinalEdges = (ss->eMap->numEntries * (edgeSize - 1) +
 	                     ss->numGrids * ((gridSize - 1) + 2 * ((gridSize - 2) * (gridSize - 1))));
-
+#ifdef WITH_OPENSUBDIV
+	if (ss->skip_grids) {
+		return 0;
+	}
+#endif
 	return numFinalEdges;
 }
 int ccgSubSurf_getNumFinalFaces(const CCGSubSurf *ss)
 {
 	int gridSize = ccg_gridsize(ss->subdivLevels);
 	int numFinalFaces = ss->numGrids * ((gridSize - 1) * (gridSize - 1));
+#ifdef WITH_OPENSUBDIV
+	if (ss->skip_grids) {
+		return 0;
+	}
+#endif
 	return numFinalFaces;
 }