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, 53 deletions

diff --git a/source/blender/draw/modes/shaders/object_particle_dot_frag.glsl b/source/blender/draw/modes/shaders/object_particle_dot_frag.glsl
deleted file mode 100644
index d15580056b0..00000000000
--- a/source/blender/draw/modes/shaders/object_particle_dot_frag.glsl
+++ /dev/null
@@ -1,53 +0,0 @@
-
-uniform vec3 color;
-uniform vec3 outlineColor;
-uniform sampler1D ramp;
-
-in vec4 radii;
-flat in float finalVal;
-
-out vec4 fragColor;
-
-void main()
-{
-  float dist = length(gl_PointCoord - vec2(0.5));
-
-  // transparent outside of point
-  // --- 0 ---
-  // smooth transition
-  // --- 1 ---
-  // pure outline color
-  // --- 2 ---
-  // smooth transition
-  // --- 3 ---
-  // pure point color
-  // ...
-  // dist = 0 at center of point
-
-  float midStroke = 0.5 * (radii[1] + radii[2]);
-
-  if (dist > midStroke) {
-    if (finalVal < 0.0) {
-      fragColor.rgb = outlineColor;
-    }
-    else {
-      fragColor.rgb = texture(ramp, finalVal).rgb;
-    }
-
-    fragColor.a = mix(1.0, 0.0, smoothstep(radii[1], radii[0], dist));
-  }
-  else {
-    if (finalVal < 0.0) {
-      fragColor.rgb = mix(color, outlineColor, smoothstep(radii[3], radii[2], dist));
-    }
-    else {
-      fragColor.rgb = texture(ramp, finalVal).rgb;
-    }
-
-    fragColor.a = 1.0;
-  }
-
-  if (fragColor.a == 0.0) {
-    discard;
-  }
-}