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, 22 deletions

diff --git a/source/blender/draw/modes/shaders/edit_mesh_overlay_mix_frag.glsl b/source/blender/draw/modes/shaders/edit_mesh_overlay_mix_frag.glsl
deleted file mode 100644
index a3fcfd880d3..00000000000
--- a/source/blender/draw/modes/shaders/edit_mesh_overlay_mix_frag.glsl
+++ /dev/null
@@ -1,22 +0,0 @@
-
-out vec4 FragColor;
-
-uniform sampler2D wireColor;
-uniform sampler2D wireDepth;
-uniform sampler2D sceneDepth;
-uniform float alpha;
-
-void main()
-{
-  ivec2 uv = ivec2(gl_FragCoord.xy);
-  float wire_depth = texelFetch(wireDepth, uv, 0).r;
-  float scene_depth = texelFetch(sceneDepth, uv, 0).r;
-  vec4 wire_color = texelFetch(wireColor, uv, 0).rgba;
-
-  FragColor = wire_color;
-
-  /* Modulate alpha if occluded */
-  if (wire_depth > scene_depth) {
-    FragColor.a *= alpha;
-  }
-}