#version 330 core

in vec3 position;
in vec2 texcoord_vert;

out vec2 texcoord_frag;

uniform float time;

uniform mat4 proj;
uniform mat4 view;
uniform mat4 model;
uniform sampler2D tex;

void main() {
    texcoord_frag = texcoord_vert;
    vec3 pos = position;
    //pos.z = sin(pos.x + time) * cos(pos.y + time);
    pos.z = texture2D(tex, pos.xy).r * 0.05;
    gl_Position = proj * view * model * vec4(pos, 1.0);
}