#version 330 core

uniform mat4 model_matrix;
uniform mat4 view_matrix;
uniform mat4 projection_matrix;

layout (location = 0) in vec3 position;
layout (location = 1) in vec3 normal;

out vec3 surface_normal;
out float depth;

void main() {
    vec4 world_position = model_matrix * vec4(position, 1.0);
    vec4 view_position = view_matrix * world_position;
    vec4 clip_position = projection_matrix * view_position;

    gl_Position = clip_position;
    surface_normal = (model_matrix * vec4(normal, 0.0)).xyz;
    depth = clamp((length(view_position) - 200) / 400, 0.0, 1.0);
}