[Bf-blender-cvs] [a5a069c272a] blender-v2.83-release: Fix T76080 Workbench: Background Glitches caused by Screen Cavity effect

[Clément Foucault]

Commit: a5a069c272a8a2a4c2acb9a7bbab484b0b23c624
Author: Clément Foucault
Date:   Tue May 19 21:37:33 2020 +0200
Branches: blender-v2.83-release
https://developer.blender.org/rBa5a069c272a8a2a4c2acb9a7bbab484b0b23c624

Fix T76080 Workbench: Background Glitches caused by Screen Cavity effect

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M	source/blender/draw/engines/workbench/shaders/workbench_curvature_lib.glsl

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diff --git a/source/blender/draw/engines/workbench/shaders/workbench_curvature_lib.glsl b/source/blender/draw/engines/workbench/shaders/workbench_curvature_lib.glsl
index e6bc4c7bbc6..a4d81393dbc 100644
--- a/source/blender/draw/engines/workbench/shaders/workbench_curvature_lib.glsl
+++ b/source/blender/draw/engines/workbench/shaders/workbench_curvature_lib.glsl
@@ -26,6 +26,10 @@ void curvature_compute(vec2 uv,
   if ((object_up != object_down) || (object_right != object_left)) {
     return;
   }
+  /* Avoid shading background pixels. */
+  if ((object_up == object_right) && (object_right == 0u)) {
+    return;
+  }
 
   float normal_up = workbench_normal_decode(texture(normalBuffer, uv + offset.zy)).g;
   float normal_down = workbench_normal_decode(texture(normalBuffer, uv - offset.zy)).g;