EEVEE: Add back split sum BSDF approximation

This improves the surface appearance of most bsdf.

1 files changed, 8 insertions, 1 deletions

diff --git a/source/blender/draw/engines/eevee/shaders/eevee_surface_deferred_frag.glsl b/source/blender/draw/engines/eevee/shaders/eevee_surface_deferred_frag.glsl
index e739961fb93..9f05006210e 100644
--- a/source/blender/draw/engines/eevee/shaders/eevee_surface_deferred_frag.glsl
+++ b/source/blender/draw/engines/eevee/shaders/eevee_surface_deferred_frag.glsl
@@ -2,6 +2,7 @@
 #pragma BLENDER_REQUIRE(common_view_lib.glsl)
 #pragma BLENDER_REQUIRE(common_math_lib.glsl)
 #pragma BLENDER_REQUIRE(eevee_surface_lib.glsl)
+#pragma BLENDER_REQUIRE(eevee_bsdf_lib.glsl)
 #pragma BLENDER_REQUIRE(eevee_gbuffer_lib.glsl)
 #pragma BLENDER_REQUIRE(eevee_nodetree_eval_lib.glsl)
 #pragma BLENDER_REQUIRE(eevee_sampling_lib.glsl)
@@ -12,6 +13,11 @@ layout(std140) uniform sampling_block
   SamplingData sampling;
 };
 
+uniform sampler2DArray utility_tx;
+
+utility_tx_fetch_define(utility_tx);
+utility_tx_sample_define(utility_tx);
+
 layout(location = 0) out uvec4 out_diffuse_data;     /* Diffuse BSDF, BSSSDF, Translucency. */
 layout(location = 1) out uvec2 out_reflection_data;  /* Glossy BSDF. */
 layout(location = 2) out uvec4 out_refraction_data;  /* Refraction BSDF. */
@@ -24,7 +30,8 @@ void main(void)
   g_data = init_globals();
 
   float noise_offset = sampling_rng_1D_get(sampling, SAMPLING_CLOSURE);
-  g_data.closure_rand = interlieved_gradient_noise(gl_FragCoord.xy, 0, noise_offset);
+  float noise = utility_tx_fetch(gl_FragCoord.xy, UTIL_BLUE_NOISE_LAYER).r;
+  g_data.closure_rand = fract(noise + noise_offset);
 
   nodetree_surface();