1 files changed, 53 insertions, 0 deletions
diff --git a/source/blender/draw/engines/overlay/shaders/edit_mesh_normal_vert.glsl b/source/blender/draw/engines/overlay/shaders/edit_mesh_normal_vert.glsl
new file mode 100644
index 00000000000..2a00160836b
--- /dev/null
+++ b/source/blender/draw/engines/overlay/shaders/edit_mesh_normal_vert.glsl
@@ -0,0 +1,53 @@
+
+uniform float normalSize;
+uniform sampler2D depthTex;
+uniform float alpha = 1.0;
+
+in vec3 pos;
+in vec3 lnor;
+in vec3 vnor;
+in vec4 norAndFlag;
+
+flat out vec4 finalColor;
+
+bool test_occlusion()
+{
+  vec3 ndc = (gl_Position.xyz / gl_Position.w) * 0.5 + 0.5;
+  return (ndc.z - 0.00035) > texture(depthTex, ndc.xy).r;
+}
+
+void main()
+{
+  GPU_INTEL_VERTEX_SHADER_WORKAROUND
+
+  vec3 nor;
+  /* Select the right normal by cheking if the generic attrib is used.  */
+  if (!all(equal(lnor, vec3(0)))) {
+    nor = lnor;
+    finalColor = colorLNormal;
+  }
+  else if (!all(equal(vnor, vec3(0)))) {
+    nor = vnor;
+    finalColor = colorVNormal;
+  }
+  else {
+    nor = norAndFlag.xyz;
+    finalColor = colorNormal;
+  }
+
+  vec3 n = normalize(normal_object_to_world(nor));
+
+  vec3 world_pos = point_object_to_world(pos);
+
+  if (gl_VertexID == 0) {
+    world_pos += n * normalSize;
+  }
+
+  gl_Position = point_world_to_ndc(world_pos);
+
+  finalColor.a *= (test_occlusion()) ? alpha : 1.0;
+
+#ifdef USE_WORLD_CLIP_PLANES
+  world_clip_planes_calc_clip_distance(world_pos);
+#endif
+}