From 2857b5a31c940a0d9ec6611b4957e3b8285c2b06 Mon Sep 17 00:00:00 2001
From: Peder Bergebakken Sundt <pbsds@hotmail.com>
Date: Mon, 1 Apr 2019 13:08:28 +0200
Subject: [PATCH] Add chromatic abberation to post shader

---
 res/shaders/post.frag | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/res/shaders/post.frag b/res/shaders/post.frag
index fe66b1e..57e2814 100644
--- a/res/shaders/post.frag
+++ b/res/shaders/post.frag
@@ -10,6 +10,10 @@ uniform uint windowHeight;
 
 uniform float time;
 
+const float chomatic_abberation_r = 0.0;
+const float chomatic_abberation_g = 0.025;
+const float chomatic_abberation_b = 0.05;
+
 void main() {
     vec2 dx = vec2(1,0) * 1.0/windowWidth;
     vec2 dy = vec2(0,1) * 1.0/windowHeight;
@@ -23,7 +27,9 @@ void main() {
     for (int x = -radius; x <= radius; x++)
     for (int y = -radius; y <= radius; y++){
         vec2 p = UV + x*dx + y*dy;
-        color += texture(framebuffer, p);
+        color.r += texture(framebuffer, (p-0.5)*(1+z*chomatic_abberation_r) + 0.5).r;
+        color.g += texture(framebuffer, (p-0.5)*(1+z*chomatic_abberation_g) + 0.5).g;
+        color.b += texture(framebuffer, (p-0.5)*(1+z*chomatic_abberation_b) + 0.5).b;
     }
     color /= pow(2*radius+1, 2);
     color_out = vec4(color * (1-pow(length((UV-0.5)*1.2), 3)), 1.0); // vignette