From 4dbf84304b91e8d695f76436c46acf20c2758c0c Mon Sep 17 00:00:00 2001
From: polyfloyd <floyd@polyfloyd.net>
Date: Sat, 19 May 2018 15:32:48 +0200
Subject: [PATCH] Add lightning.glsl

---
 lightning.glsl | 60 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 lightning.glsl

diff --git a/lightning.glsl b/lightning.glsl
new file mode 100644
index 0000000..0423616
--- /dev/null
+++ b/lightning.glsl
@@ -0,0 +1,60 @@
+// Lightning
+// By: Brandon Fogerty
+// bfogerty at gmail dot com
+// xdpixel.com
+
+
+// MORE MODS BY 27
+
+
+#ifdef GL_ES
+precision lowp float;
+#endif
+
+uniform float time;
+uniform vec2 resolution;
+
+
+float Hash( vec2 p)
+{
+	vec3 p2 = vec3(p.xy,1.0);
+	return fract(sin(dot(p2,vec3(37.1,61.7, 12.4)))*858.5453123);
+}
+
+float noise(in vec2 p)
+{
+	vec2 i = floor(p);
+	vec2 f = fract(p);
+	f *= f * (3.0-2.0*f);
+
+	return mix(mix(Hash(i + vec2(0.,0.)), Hash(i + vec2(1.,0.)),f.x),
+			mix(Hash(i + vec2(0.,1.)), Hash(i + vec2(1.,1.)),f.x),
+			f.y);
+}
+
+float fbm(vec2 p)
+{
+	float v = 0.0;
+	v += noise(p*1.)*2.200;
+	v += noise(p*2.)*0.00025;
+	v -= noise(p*4.)*3.125;
+	v += noise(p*8.)*.00625;
+	v += noise(p*16.)*0.00625;
+	return v;
+}
+
+void main( void )
+{
+
+	vec2 uv = ( gl_FragCoord.xy / resolution.xy ) * 2.0 - 1.0;
+	uv.x *= resolution.x/resolution.y;
+	uv /= max(resolution.x, resolution.y) / 30.0;
+
+	vec3 finalColor = vec3( 0.0 );
+	for( int i=1; i < 2; ++i ) {
+		float t = abs(2.0 / ((uv.x + fbm( uv + time/float(i)))*75.));
+		finalColor +=  t * vec3( float(i) * 6.2 +0.2, 1.2, 13.0 );
+	}
+
+	gl_FragColor = vec4( finalColor, 1.0 );
+}