DRW: Add wireframe buffer texture generation for wireframe drawing.

Only OB_MESH is supported for now.

Creates a simple index buffer with negative indices if the edges is not a
real edge.

Also create the buffer texture representation of this buffer along with the
pos_in_order buffer texture.

1 files changed, 13 insertions, 1 deletions

diff --git a/source/blender/draw/intern/draw_cache.c b/source/blender/draw/intern/draw_cache.c
index ddf41ceff8a..33fb801af5a 100644
--- a/source/blender/draw/intern/draw_cache.c
+++ b/source/blender/draw/intern/draw_cache.c
@@ -502,7 +502,6 @@ Gwn_Batch *DRW_cache_object_wire_outline_get(Object *ob)
 	}
 }
 
-/* Returns a buffer texture. */
 Gwn_Batch *DRW_cache_object_edge_detection_get(Object *ob, bool *r_is_manifold)
 {
 	switch (ob->type) {
@@ -515,6 +514,19 @@ Gwn_Batch *DRW_cache_object_edge_detection_get(Object *ob, bool *r_is_manifold)
 	}
 }
 
+/* Returns a buffer texture. */
+void DRW_cache_object_face_wireframe_get(
+        Object *ob, struct GPUTexture **r_vert_tx, struct GPUTexture **r_faceid_tx, int *r_tri_count)
+{
+	switch (ob->type) {
+		case OB_MESH:
+			DRW_mesh_batch_cache_get_wireframes_face_texbuf((Mesh *)ob->data, r_vert_tx, r_faceid_tx, r_tri_count);
+
+		/* TODO, should match 'DRW_cache_object_surface_get' */
+	}
+}
+
+
 Gwn_Batch *DRW_cache_object_surface_get(Object *ob)
 {
 	switch (ob->type) {