cOMS/shaders/liquids/water/water_vertex.hlsl

uniform sampler2D water;
varying vec3 position;

void main() {
    vec4 info = texture2D(water, gl_Vertex.xy * 0.5 + 0.5);
    position = gl_Vertex.xzy;
    position.y += info.r;
    gl_Position = gl_ModelViewProjectionMatrix * vec4(position, 1.0);
}