water.glsl

FRAGMENT_SHADER

precision lowp float;

varying vec2 uv;
varying vec2 uv1;

uniform vec4 _Time;    
uniform sampler2D Texture;
uniform sampler2D _ScreenTexture;

#define amp 0.02

void main() {
    vec2 p = uv;
    vec2 h = uv1 * 0.02;
    float time = _Time.x;
    
    h.x += sin(h.y * 15. + time * 2.) / 30.;
    h.y += cos(h.x * 10. + time * 2.) / 30.;
            
    p.x += sin((h.y + h.x) * 15. + time * 2.) / (400. + (10. * sin(time)));
    p.y += cos((h.y + h.x) * 15. + time * 2.) / (400. + (10. * sin(time)));

    vec3 res = texture2D(_ScreenTexture, p).rgb * vec3(0.8, 0.8, 0.9) + vec3(0.0, 0.0, 0.04 * sin(h.y * 15. + time * 2.)) * cos(h.x * 10. + time * 2.);

    gl_FragColor = vec4(res, 1.0);
}

VERTEX_SHADER
attribute vec3 position;
attribute vec2 texcoord;

varying lowp vec4 color;
varying lowp vec2 uv;
varying lowp vec2 uv1;

uniform mat4 Model;
uniform mat4 Projection;

void main() {
    vec4 res = Projection * Model * vec4(position, 1);

    uv = res.xy / 2.0 + vec2(0.5, 0.5);
    uv1 = position.xy;

    gl_Position = res;
}