Overlay Engine: Refactor & Cleanup

This is the unification of all overlays into one overlay engine as described in T65347.

I went over all the code making it more future proof with less hacks and removing old / not relevent parts.

Goals / Acheivements:
- Remove internal shader usage (only drw shaders)
- Remove viewportSize and viewportSizeInv and put them in gloabl ubo
- Fixed some drawing issues: Missing probe option and Missing Alt+B clipping of some shader
- Remove old (legacy) shaders dependancy (not using view UBO).
- Less shader variation (less compilation time at first load and less patching needed for vulkan)
- removed some geom shaders when I could
- Remove static e_data (except shaders storage where it is OK)
- Clear the way to fix some anoying limitations (dithered transparency, background image compositing etc...)
- Wireframe drawing now uses the same batching capabilities as workbench & eevee (indirect drawing).
- Reduced complexity, removed ~3000 Lines of code in draw (also removed a lot of unused shader in GPU).
- Post AA to avoid complexity and cost of MSAA.

Remaining issues:
- ~~Armature edits, overlay toggles, (... others?) are not refreshing viewport after AA is complete~~
- FXAA is not the best for wires, maybe investigate SMAA
- Maybe do something more temporally stable for AA.
- ~~Paint overlays are not working with AA.~~
- ~~infront objects are difficult to select.~~
- ~~the infront wires sometimes goes through they solid counterpart (missing clear maybe?) (toggle overlays on-off when using infront+wireframe overlay in solid shading)~~

Note: I made some decision to change slightly the appearance of some objects to simplify their drawing. Namely the empty arrows end (which is now hollow/wire) and distance points of the cameras/spots being done by lines.

Reviewed By: jbakker

Differential Revision: https://developer.blender.org/D6296

1 files changed, 13 insertions, 19 deletions

diff --git a/source/blender/draw/intern/draw_cache.h b/source/blender/draw/intern/draw_cache.h
index 273e97c6e49..11564464546 100644
--- a/source/blender/draw/intern/draw_cache.h
+++ b/source/blender/draw/intern/draw_cache.h
@@ -37,16 +37,15 @@ void DRW_shape_cache_reset(void);
 struct GPUBatch *DRW_cache_cursor_get(bool crosshair_lines);
 
 /* Common Shapes */
+struct GPUBatch *DRW_cache_groundline_get(void);
 struct GPUBatch *DRW_cache_grid_get(void);
 struct GPUBatch *DRW_cache_fullscreen_quad_get(void);
 struct GPUBatch *DRW_cache_quad_get(void);
 struct GPUBatch *DRW_cache_quad_wires_get(void);
 struct GPUBatch *DRW_cache_cube_get(void);
 struct GPUBatch *DRW_cache_sphere_get(void);
-struct GPUBatch *DRW_cache_single_vert_get(void);
-struct GPUBatch *DRW_cache_single_line_get(void);
-struct GPUBatch *DRW_cache_single_line_endpoints_get(void);
 struct GPUBatch *DRW_cache_screenspace_circle_get(void);
+struct GPUBatch *DRW_cache_normal_arrow_get(void);
 
 /* Common Object */
 struct GPUBatch *DRW_cache_object_all_edges_get(struct Object *ob);
@@ -66,41 +65,36 @@ struct GPUBatch *DRW_cache_plain_axes_get(void);
 struct GPUBatch *DRW_cache_single_arrow_get(void);
 struct GPUBatch *DRW_cache_empty_cube_get(void);
 struct GPUBatch *DRW_cache_circle_get(void);
-struct GPUBatch *DRW_cache_square_get(void);
 struct GPUBatch *DRW_cache_empty_sphere_get(void);
 struct GPUBatch *DRW_cache_empty_cylinder_get(void);
 struct GPUBatch *DRW_cache_empty_cone_get(void);
 struct GPUBatch *DRW_cache_empty_capsule_cap_get(void);
 struct GPUBatch *DRW_cache_empty_capsule_body_get(void);
-struct GPUBatch *DRW_cache_image_plane_get(void);
-struct GPUBatch *DRW_cache_image_plane_wire_get(void);
 
 /* Force Field */
 struct GPUBatch *DRW_cache_field_wind_get(void);
 struct GPUBatch *DRW_cache_field_force_get(void);
 struct GPUBatch *DRW_cache_field_vortex_get(void);
+struct GPUBatch *DRW_cache_field_curve_get(void);
 struct GPUBatch *DRW_cache_field_tube_limit_get(void);
 struct GPUBatch *DRW_cache_field_cone_limit_get(void);
-
-/* Grease Pencil */
-struct GPUBatch *DRW_cache_gpencil_axes_get(void);
+struct GPUBatch *DRW_cache_field_sphere_limit_get(void);
 
 /* Lights */
-struct GPUBatch *DRW_cache_light_get(void);
-struct GPUBatch *DRW_cache_light_shadows_get(void);
-struct GPUBatch *DRW_cache_light_sunrays_get(void);
-struct GPUBatch *DRW_cache_light_area_square_get(void);
-struct GPUBatch *DRW_cache_light_area_disk_get(void);
-struct GPUBatch *DRW_cache_light_hemi_get(void);
-struct GPUBatch *DRW_cache_light_spot_get(void);
+struct GPUBatch *DRW_cache_light_point_lines_get(void);
+struct GPUBatch *DRW_cache_light_sun_lines_get(void);
+struct GPUBatch *DRW_cache_light_spot_lines_get(void);
+struct GPUBatch *DRW_cache_light_area_disk_lines_get(void);
+struct GPUBatch *DRW_cache_light_area_square_lines_get(void);
 struct GPUBatch *DRW_cache_light_spot_volume_get(void);
-struct GPUBatch *DRW_cache_light_spot_square_get(void);
-struct GPUBatch *DRW_cache_light_spot_square_volume_get(void);
 
 /* Camera */
-struct GPUBatch *DRW_cache_camera_get(void);
 struct GPUBatch *DRW_cache_camera_frame_get(void);
+struct GPUBatch *DRW_cache_camera_volume_get(void);
+struct GPUBatch *DRW_cache_camera_volume_wire_get(void);
+struct GPUBatch *DRW_cache_camera_tria_wire_get(void);
 struct GPUBatch *DRW_cache_camera_tria_get(void);
+struct GPUBatch *DRW_cache_camera_distances_get(void);
 
 /* Speaker */
 struct GPUBatch *DRW_cache_speaker_get(void);