Add stripes.glsl

stripes.glsl

@@ -0,0 +1,59 @@
+#ifdef GL_ES
+precision mediump float;
+#extension GL_OES_standard_derivatives : enable
+#endif
+
+uniform float time;
+uniform vec2 mouse;
+uniform vec2 resolution;
+#define t time
+#define r resolution
+
+// Created by inigo quilez - iq/2015
+// License Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.
+
+
+// A simple way to create color variation in a cheap way (yes, trigonometrics ARE cheap
+// in the GPU, don't try to be smart and use a triangle wave instead).
+
+// See http://iquilezles.org/www/articles/palettes/palettes.htm for more information
+
+
+vec3 pal( in float t, in vec3 a, in vec3 b, in vec3 c, in vec3 d )
+{
+	return a + b*cos( 6.28318*(c*t+d) );
+}
+
+void mainImage( out vec4 fragColor, in vec2 fragCoord )
+{
+	vec2 p = fragCoord.xy / r.xy;
+
+	// animate
+	p.x += 0.3*t;
+
+	// compute colors
+	vec3                col = pal( p.x, vec3(0.5,0.5,0.5),vec3(0.5,0.5,0.5),vec3(1.0,1.0,1.0),vec3(0.0,0.33,0.67) );
+	if( p.y>(1.0/7.0) ) col = pal( p.x, vec3(0.5,0.5,0.5),vec3(0.5,0.5,0.5),vec3(1.0,1.0,1.0),vec3(0.0,0.10,0.20) );
+	if( p.y>(2.0/7.0) ) col = pal( p.x, vec3(0.5,0.5,0.5),vec3(0.5,0.5,0.5),vec3(1.0,1.0,1.0),vec3(0.3,0.20,0.20) );
+	if( p.y>(3.0/7.0) ) col = pal( p.x, vec3(0.5,0.5,0.5),vec3(0.5,0.5,0.5),vec3(1.0,1.0,0.5),vec3(0.8,0.90,0.30) );
+	if( p.y>(4.0/7.0) ) col = pal( p.x, vec3(0.5,0.5,0.5),vec3(0.5,0.5,0.5),vec3(1.0,0.7,0.4),vec3(0.0,0.15,0.20) );
+	if( p.y>(5.0/7.0) ) col = pal( p.x, vec3(0.5,0.5,0.5),vec3(0.5,0.5,0.5),vec3(2.0,1.0,0.0),vec3(0.5,0.20,0.25) );
+	if( p.y>(6.0/7.0) ) col = pal( p.x, vec3(0.8,0.5,0.4),vec3(0.2,0.4,0.2),vec3(2.0,1.0,1.0),vec3(0.0,0.25,0.25) );
+
+
+	// band
+	float f = fract(p.y*7.0);
+	// borders
+	col *= smoothstep( 0.49, 0.47, abs(f-0.5) );
+	// shadowing
+	col *= 0.5 + 0.5*sqrt(4.0*f*(1.0-f));
+	// dithering
+	//col += (1.0/255.0)*texture2D( iChannel0, fragCoord.xy/iChannelResolution[0].xy ).xyz;
+
+	fragColor = vec4( col, 1.0 );
+}
+
+void main()
+{
+	mainImage(gl_FragColor, gl_FragCoord.xy);
+}