corregit shader water. afegides metadades en els shaders

shaders/shader_art_coding_introduction.frag.glsl

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+// Name: Shader Art Coding Introduction
+// Author: kishimisu
+// URL: https://www.shadertoy.com/view/mtyGWy
+#version 330 core
+precision highp float;
+
+out vec4 FragColor;
+in vec2 vUV;
+uniform vec2 iResolution;
+uniform float iTime;
+
+vec3 palette( float t) {
+    vec3 a = vec3(0.5, 0.5, 0.5);
+    vec3 b = vec3(0.5, 0.5, 0.5);
+    vec3 c = vec3(1.0, 1.0, 1.0);
+    vec3 d = vec3(0.263, 0.416, 0.557);
+    return a + b * cos( 6.28318 * (c * t * d) );
+}
+
+void mainImage( out vec4 fragColor, in vec2 fragCoord )
+{
+    vec2 uv = (fragCoord * 2.0 - iResolution.xy) / iResolution.y;
+    vec2 uv0 = uv;
+    vec3 finalColor = vec3(0.0);
+    
+    for (float i = 0.0; i < 4.0; i++) {
+        uv = fract(uv * 1.5) - 0.5;
+
+        float d = length(uv) * exp(-length(uv0));
+
+        vec3 col = palette(length(uv0) + i * 0.4 + iTime * 0.4);
+
+        d = sin(d * 8.0 + iTime) / 8.0;
+
+        d = abs(d);
+
+        d = pow(0.01 / d, 1.2);
+
+        finalColor += col * d;
+    }
+    
+    fragColor = vec4(finalColor, 1.0);
+}
+
+void main() {
+    vec2 fragCoordPixels = vUV * iResolution;
+    vec4 outColor;
+    mainImage(outColor, fragCoordPixels);
+    FragColor = outColor;
+}