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, 0 insertions, 36 deletions

diff --git a/source/blender/draw/modes/shaders/edit_normals_vert.glsl b/source/blender/draw/modes/shaders/edit_normals_vert.glsl
deleted file mode 100644
index 384d13923f6..00000000000
--- a/source/blender/draw/modes/shaders/edit_normals_vert.glsl
+++ /dev/null
@@ -1,36 +0,0 @@
-
-uniform float normalSize;
-
-in vec3 pos;
-
-#ifdef LOOP_NORMALS
-in vec3 lnor;
-#  define nor lnor
-
-#elif defined(FACE_NORMALS)
-in vec4 norAndFlag;
-#  define nor norAndFlag.xyz
-#else
-
-in vec3 vnor;
-#  define nor vnor
-#endif
-
-flat out vec4 v1;
-flat out vec4 v2;
-
-void main()
-{
-  GPU_INTEL_VERTEX_SHADER_WORKAROUND
-
-  vec3 n = normalize(normal_object_to_world(nor));
-
-  vec3 world_pos = point_object_to_world(pos);
-
-  v1 = point_world_to_ndc(world_pos);
-  v2 = point_world_to_ndc(world_pos + n * normalSize);
-
-#ifdef USE_WORLD_CLIP_PLANES
-  world_clip_planes_calc_clip_distance(world_pos);
-#endif
-}