Edit UVs: Refactor drawing Edit UV in Image Editor

NOTE: This commit only concern edit UVs and not the "shadow" mesh displayed
when texture painting. This will be address in a future commit.

We now cache the uv mesh in the mesh batch cache and only reupload data on
changes.

Update could be more granular (and a bit faster) but it's not our main
concern ATM.

This should fix problem caused by the IMM api used to draw large meshes.
This makes performance skyrocket compared to previous implementation.
There is still a big CPU bottleneck when not in sync selection mode but it
is not related to the drawing function directly.

1 files changed, 15 insertions, 0 deletions

diff --git a/source/blender/draw/intern/draw_cache_impl.h b/source/blender/draw/intern/draw_cache_impl.h
index 4bd0046a48a..9ce994adbc0 100644
--- a/source/blender/draw/intern/draw_cache_impl.h
+++ b/source/blender/draw/intern/draw_cache_impl.h
@@ -36,6 +36,7 @@ struct ListBase;
 struct ModifierData;
 struct ParticleSystem;
 struct PTCacheEdit;
+struct SpaceImage;
 
 struct Curve;
 struct Lattice;
@@ -156,6 +157,20 @@ void DRW_mesh_batch_cache_get_wireframes_face_texbuf(
 
 void DRW_mesh_cache_sculpt_coords_ensure(struct Mesh *me);
 
+enum {
+	UVEDIT_EDGES          = (1 << 0),
+	UVEDIT_DATA           = (1 << 1),
+	UVEDIT_FACEDOTS       = (1 << 2),
+	UVEDIT_FACES          = (1 << 3),
+	UVEDIT_STRETCH_ANGLE  = (1 << 4),
+	UVEDIT_STRETCH_AREA   = (1 << 5),
+	UVEDIT_SYNC_SEL       = (1 << 6),
+};
+
+void DRW_mesh_cache_uvedit(
+        struct Object *me, struct SpaceImage *sima, struct Scene *scene, uchar state,
+        struct GPUBatch **faces, struct GPUBatch **edges, struct GPUBatch **verts, struct GPUBatch **facedots);
+
 /* Edit mesh bitflags (is this the right place?) */
 
 enum {