Workbench Simplification Refactor

This patch is (almost) a complete rewrite of workbench engine.
The features remain unchanged but the code quality is greatly improved.
Hair shading is brighter but also more correct.

This also introduce the concept of `DRWShaderLibrary` to make a simple
include system inside the GLSL files.

Differential Revision: https://developer.blender.org/D7060

1 files changed, 6 insertions, 2 deletions

diff --git a/source/blender/blenlib/intern/BLI_memblock.c b/source/blender/blenlib/intern/BLI_memblock.c
index ee9ea15835b..b532202ebaa 100644
--- a/source/blender/blenlib/intern/BLI_memblock.c
+++ b/source/blender/blenlib/intern/BLI_memblock.c
@@ -191,10 +191,14 @@ void *BLI_memblock_iterstep(BLI_memblock_iter *iter)
   return ptr;
 }
 
-/* Direct access. elem is element index inside the chosen chunk. */
+/* Direct access. elem is element index inside the chosen chunk.
+ * Double usage: You can set chunk to 0 and set the absolute elem index.
+ * The correct chunk will be retrieve. */
 void *BLI_memblock_elem_get(BLI_memblock *mblk, int chunk, int elem)
 {
   BLI_assert(chunk < mblk->chunk_len);
-  BLI_assert(elem < (mblk->chunk_size / mblk->elem_size));
+  int elem_per_chunk = mblk->chunk_size / mblk->elem_size;
+  chunk += elem / elem_per_chunk;
+  elem = elem % elem_per_chunk;
   return (char *)(mblk->chunk_list[chunk]) + mblk->elem_size * elem;
 }