Workbench: Add "Shadow" factor to Xray

This just maintain more parity accross the 2 visuals. Note that this is not
"real shadowing" just the facing factor shadowing.

1 files changed, 11 insertions, 0 deletions

diff --git a/source/blender/draw/engines/workbench/shaders/workbench_forward_transparent_accum_frag.glsl b/source/blender/draw/engines/workbench/shaders/workbench_forward_transparent_accum_frag.glsl
index 93da32dd765..b3642b7beb3 100644
--- a/source/blender/draw/engines/workbench/shaders/workbench_forward_transparent_accum_frag.glsl
+++ b/source/blender/draw/engines/workbench/shaders/workbench_forward_transparent_accum_frag.glsl
@@ -14,6 +14,11 @@ uniform vec3 materialDiffuseColor;
 uniform vec3 materialSpecularColor;
 uniform float materialRoughness;
 
+uniform float shadowMultiplier = 0.5;
+uniform float lightMultiplier = 1.0;
+uniform float shadowShift = 0.1;
+uniform float shadowFocus = 1.0;
+
 #ifdef NORMAL_VIEWPORT_PASS_ENABLED
 in vec3 normal_viewport;
 #endif /* NORMAL_VIEWPORT_PASS_ENABLED */
@@ -67,6 +72,12 @@ void main()
 	                                       nor, I_vs);
 #endif
 
+#ifdef V3D_SHADING_SHADOW
+	float light_factor = -dot(nor, world_data.shadow_direction_vs.xyz);
+	float shadow_mix = smoothstep(shadowFocus, shadowShift, light_factor);
+	shaded_color *= mix(lightMultiplier, shadowMultiplier, shadow_mix);
+#endif
+
 	/* Based on :
 	 * McGuire and Bavoil, Weighted Blended Order-Independent Transparency, Journal of
 	 * Computer Graphics Techniques (JCGT), vol. 2, no. 2, 122–141, 2013