GPencil: Refactor of Draw Engine, Vertex Paint and all internal functions

This commit is a full refactor of the grease pencil modules including Draw Engine, Modifiers, VFX, depsgraph update, improvements in operators and conversion of Sculpt and Weight paint tools to real brushes.

Also, a huge code cleanup has been done at all levels.

Thanks to @fclem for his work and yo @pepeland and @mendio for the testing and help in the development.

Differential Revision: https://developer.blender.org/D6293

1 files changed, 27 insertions, 0 deletions

diff --git a/source/blender/draw/intern/draw_cache.c b/source/blender/draw/intern/draw_cache.c
index f37e5b14d83..d0cea5b8c5c 100644
--- a/source/blender/draw/intern/draw_cache.c
+++ b/source/blender/draw/intern/draw_cache.c
@@ -136,6 +136,7 @@ static struct DRWShapeCache {
   GPUBatch *drw_particle_cross;
   GPUBatch *drw_particle_circle;
   GPUBatch *drw_particle_axis;
+  GPUBatch *drw_gpencil_dummy_quad;
 } SHC = {NULL};
 
 void DRW_shape_cache_free(void)
@@ -747,6 +748,29 @@ GPUBatch *DRW_cache_normal_arrow_get(void)
 }
 
 /* -------------------------------------------------------------------- */
+/** \name Dummy vbos
+ *
+ * We need a dummy vbo containing the vertex count to draw instances ranges.
+ *
+ * \{ */
+
+GPUBatch *DRW_gpencil_dummy_buffer_get(void)
+{
+  if (SHC.drw_gpencil_dummy_quad == NULL) {
+    GPUVertFormat format = {0};
+    GPU_vertformat_attr_add(&format, "dummy", GPU_COMP_U8, 1, GPU_FETCH_INT);
+    GPUVertBuf *vbo = GPU_vertbuf_create_with_format(&format);
+    GPU_vertbuf_data_alloc(vbo, 4);
+
+    SHC.drw_gpencil_dummy_quad = GPU_batch_create_ex(
+        GPU_PRIM_TRI_FAN, vbo, NULL, GPU_BATCH_OWNS_VBO);
+  }
+  return SHC.drw_gpencil_dummy_quad;
+}
+
+/** \} */
+
+/* -------------------------------------------------------------------- */
 /** \name Common Object API
  * \{ */
 
@@ -793,6 +817,9 @@ GPUBatch *DRW_cache_object_face_wireframe_get(Object *ob)
       return DRW_cache_text_face_wireframe_get(ob);
     case OB_MBALL:
       return DRW_cache_mball_face_wireframe_get(ob);
+    case OB_GPENCIL: {
+      return DRW_cache_gpencil_face_wireframe_get(ob);
+    }
     default:
       return NULL;
   }