#version 450 core
#include "common.glsl"

layout(location = 0) in vec3 aPos;
uniform float uWaveStrength;

out vec3 vWorld;

void main() {
    vec3 p = aPos;
    // Gentle swell; fine detail comes from per-pixel normals.
    p.y += (sin(p.x * 1.3 + uTime * 1.1) * cos(p.z * 1.1 + uTime * 0.9) +
            sin(p.x * 0.7 - p.z * 0.9 + uTime * 0.6) * 0.5) * 0.018 * uWaveStrength;
    vWorld = p;
    gl_Position = uViewProj * vec4(p, 1.0);
}