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, 2 insertions, 0 deletions

diff --git a/source/blender/draw/CMakeLists.txt b/source/blender/draw/CMakeLists.txt
index 1fd731c0c41..c3ae8050491 100644
--- a/source/blender/draw/CMakeLists.txt
+++ b/source/blender/draw/CMakeLists.txt
@@ -93,6 +93,7 @@ set(SRC
 	engines/eevee/eevee_motion_blur.c
 	engines/eevee/eevee_occlusion.c
 	engines/eevee/eevee_screen_raytrace.c
+	engines/eevee/eevee_subsurface.c
 	engines/eevee/eevee_temporal_sampling.c
 	engines/eevee/eevee_volumes.c
 	engines/external/external_engine.c
@@ -156,6 +157,7 @@ data_to_c_simple(engines/eevee/shaders/effect_gtao_frag.glsl SRC)
 data_to_c_simple(engines/eevee/shaders/effect_minmaxz_frag.glsl SRC)
 data_to_c_simple(engines/eevee/shaders/effect_motion_blur_frag.glsl SRC)
 data_to_c_simple(engines/eevee/shaders/effect_ssr_frag.glsl SRC)
+data_to_c_simple(engines/eevee/shaders/effect_subsurface_frag.glsl SRC)
 data_to_c_simple(engines/eevee/shaders/effect_temporal_aa.glsl SRC)
 data_to_c_simple(engines/eevee/shaders/lightprobe_planar_downsample_frag.glsl SRC)
 data_to_c_simple(engines/eevee/shaders/lightprobe_planar_downsample_geom.glsl SRC)