1 files changed, 18 insertions, 1 deletions
diff --git a/source/blender/gpu/GPU_element.h b/source/blender/gpu/GPU_element.h
index 4ac89d2658b..75caf4cbd6a 100644
--- a/source/blender/gpu/GPU_element.h
+++ b/source/blender/gpu/GPU_element.h
@@ -36,14 +36,19 @@ typedef enum {
 } GPUIndexBufType;
 
 typedef struct GPUIndexBuf {
+  uint index_start;
   uint index_len;
+  bool is_subrange;
 #if GPU_TRACK_INDEX_RANGE
   GPUIndexBufType index_type;
   uint32_t gl_index_type;
   uint base_index;
 #endif
   uint32_t ibo_id; /* 0 indicates not yet sent to VRAM */
-  void *data;      /* non-NULL indicates not yet sent to VRAM */
+  union {
+    void *data;              /* non-NULL indicates not yet sent to VRAM */
+    struct GPUIndexBuf *src; /* if is_subrange is true, this is the source buffer. */
+  };
 } GPUIndexBuf;
 
 void GPU_indexbuf_use(GPUIndexBuf *);
@@ -71,9 +76,21 @@ void GPU_indexbuf_add_line_verts(GPUIndexBufBuilder *, uint v1, uint v2);
 void GPU_indexbuf_add_tri_verts(GPUIndexBufBuilder *, uint v1, uint v2, uint v3);
 void GPU_indexbuf_add_line_adj_verts(GPUIndexBufBuilder *, uint v1, uint v2, uint v3, uint v4);
 
+void GPU_indexbuf_set_point_vert(GPUIndexBufBuilder *builder, uint elem, uint v1);
+void GPU_indexbuf_set_line_verts(GPUIndexBufBuilder *builder, uint elem, uint v1, uint v2);
+void GPU_indexbuf_set_tri_verts(GPUIndexBufBuilder *builder, uint elem, uint v1, uint v2, uint v3);
+
+/* Skip primitive rendering at the given index. */
+void GPU_indexbuf_set_point_restart(GPUIndexBufBuilder *builder, uint elem);
+void GPU_indexbuf_set_line_restart(GPUIndexBufBuilder *builder, uint elem);
+void GPU_indexbuf_set_tri_restart(GPUIndexBufBuilder *builder, uint elem);
+
 GPUIndexBuf *GPU_indexbuf_build(GPUIndexBufBuilder *);
 void GPU_indexbuf_build_in_place(GPUIndexBufBuilder *, GPUIndexBuf *);
 
+/* Create a subrange of an existing indexbuffer. */
+GPUIndexBuf *GPU_indexbuf_create_subrange(GPUIndexBuf *ibo, uint start, uint length);
+
 void GPU_indexbuf_discard(GPUIndexBuf *);
 
 int GPU_indexbuf_primitive_len(GPUPrimType prim_type);