Eevee: Initial Separable Subsurface Scattering implementation.

How to use:
- Enable subsurface scattering in the render options.
- Add Subsurface BSDF to your shader.
- Check "Screen Space Subsurface Scattering" in the material panel options.

This initial implementation has a few limitations:
- only supports gaussian SSS.
- Does not support principled shader.
- The radius parameters is baked down to a number of samples and then put into an UBO. This means the radius input socket cannot be used. You need to tweak the default vector directly.
- The "texture blur" is considered as always set to 1

1 files changed, 3 insertions, 0 deletions

diff --git a/source/blender/gpu/GPU_material.h b/source/blender/gpu/GPU_material.h
index de274b87f9e..039adc68e6d 100644
--- a/source/blender/gpu/GPU_material.h
+++ b/source/blender/gpu/GPU_material.h
@@ -235,6 +235,9 @@ void GPU_material_enable_alpha(GPUMaterial *material);
 GPUBuiltin GPU_get_material_builtins(GPUMaterial *material);
 GPUBlendMode GPU_material_alpha_blend(GPUMaterial *material, float obcol[4]);
 
+void GPU_material_sss_profile_create(GPUMaterial *material, float *radii);
+struct GPUUniformBuffer *GPU_material_sss_profile_get(GPUMaterial *material);
+
 /* High level functions to create and use GPU materials */
 GPUMaterial *GPU_material_world(struct Scene *scene, struct World *wo);
 GPUMaterial *GPU_material_from_nodetree_find(