From 451e872ddbe6db8bd8d6aa54ca0bf744dc5405e5 Mon Sep 17 00:00:00 2001
From: Patrick Schönberger
Date: Wed, 3 Feb 2021 11:08:49 +0100
Subject: Screen Space SSS

---
 shaders/fbo_frag.glsl | 28 ++++++++++++++++++++++++----
 1 file changed, 24 insertions(+), 4 deletions(-)

(limited to 'shaders')

diff --git a/shaders/fbo_frag.glsl b/shaders/fbo_frag.glsl
index cf1fafa..f6f12cd 100644
--- a/shaders/fbo_frag.glsl
+++ b/shaders/fbo_frag.glsl
@@ -4,10 +4,30 @@ out vec4 FragColor;
 in vec2 TexCoords;
 
 uniform sampler2D screenTexture;
+uniform int applySSSSS;
+uniform int N;
 
 void main()
-{ 
-    FragColor = vec4(
-        texture(screenTexture, TexCoords).rgb,
-        1.0);
+{
+    if (applySSSSS == 1) {
+        float x = 1.0/1600.0;
+        float y = 1.0/900.0;
+
+        float maxDist = N*N + N*N;
+
+        vec4 color = vec4(0, 0, 0, 1);
+        for (int i = -N; i <= N; i++) {
+            for (int j = -N; j <= N; j++) {
+                float dist = i*i + j*j;
+                vec4 newC = texture(screenTexture, TexCoords + vec2(i*x, j*y)) / (2*N*N);
+                float factor = 1 - (dist / maxDist);
+                factor = pow(factor, 2);
+                color += newC * factor;
+            }
+        }
+        FragColor = color;
+    }
+    else {
+        FragColor = texture(screenTexture, TexCoords);
+    }
 }
-- 
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