1 files changed, 55 insertions, 0 deletions

diff --git a/assets/shaders/Water.frag.glsl b/assets/shaders/Water.frag.glsl
new file mode 100644
index 00000000..5b71a658
--- /dev/null
+++ b/assets/shaders/Water.frag.glsl
@@ -0,0 +1,55 @@
+#ifdef GL_ES
+precision highp float;
+#endif
+
+uniform sampler2D u_tex0;
+uniform float u_time;
+uniform vec2 u_resolution;
+
+const float speedx = 1./ 0.1;
+const float speedy = 1./ .01;
+const float speedr = 1./ 0.01;
+const float delta = 20.;
+const float intence = 10.;
+const int dif = 7;
+
+float col(vec2 coord)
+{
+  float delta_theta = 3.1415926535897932 / float(dif);
+  float col = 0.;
+  float theta = 0.;
+  theta = u_time/200.;
+
+  coord.x += u_time/speedx;
+  coord.y += u_time/speedy;
+  for (int i = 0; i < dif; i++)
+  {
+    coord.x += u_time/speedr;
+    theta = theta + delta_theta;
+    col = col + cos( (coord.x*cos(theta) - coord.y*sin(theta))*20. );
+  }
+
+  return cos(col);
+}
+
+void main(void)
+{
+        vec2 p = (gl_FragCoord.xy) / u_resolution.xy;
+
+        vec2 c1 = p;
+        vec2 c2 = p;
+
+        c2.x = c2.x+u_resolution.x/delta;
+        float dx = (col(c1)-col(c2))/delta;
+
+        c2 = p;
+        c2.y = c2.y + u_resolution.y/delta;
+        float dy = (col(c1)-col(c2))/delta;
+
+        c1.x = c1.x+dx;
+        c1.y = -(c1.y+dy);
+
+        float alpha = 1.+dot(dx,dy)*intence;
+        if (alpha < 0.7) alpha = 0.7;
+        gl_FragColor = texture2D(u_tex0,c1)*(alpha);
+}