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, 35 deletions

diff --git a/source/blender/draw/modes/shaders/armature_axes_vert.glsl b/source/blender/draw/modes/shaders/armature_axes_vert.glsl
deleted file mode 100644
index d7ed3e9ab71..00000000000
--- a/source/blender/draw/modes/shaders/armature_axes_vert.glsl
+++ /dev/null
@@ -1,35 +0,0 @@
-
-uniform mat4 ViewProjectionMatrix;
-uniform vec3 screenVecs[3];
-
-/* ---- Instantiated Attrs ---- */
-in float axis; /* position on the axis. [0.0-1.0] is X axis, [1.0-2.0] is Y, etc... */
-in vec2 screenPos;
-in vec3 colorAxis;
-
-/* ---- Per instance Attrs ---- */
-in mat4 InstanceModelMatrix;
-in vec4 color;
-
-flat out vec4 finalColor;
-
-void main()
-{
-  vec3 chosen_axis = InstanceModelMatrix[int(axis)].xyz;
-  vec3 y_axis = InstanceModelMatrix[1].xyz;
-  vec3 bone_loc = InstanceModelMatrix[3].xyz;
-  vec3 wpos = bone_loc + y_axis + chosen_axis * fract(axis);
-  vec3 spos = screenVecs[0].xyz * screenPos.x + screenVecs[1].xyz * screenPos.y;
-  /* Scale uniformly by axis length */
-  spos *= length(chosen_axis);
-
-  vec4 pos_4d = vec4(wpos + spos, 1.0);
-  gl_Position = ViewProjectionMatrix * pos_4d;
-
-  finalColor.rgb = mix(colorAxis, color.rgb, color.a);
-  finalColor.a = 1.0;
-
-#ifdef USE_WORLD_CLIP_PLANES
-  world_clip_planes_calc_clip_distance(pos_4d.xyz);
-#endif
-}