#version 330 core
layout (location = 0) in vec3 a_xyz;
layout (location = 1) in vec2 a_uv;
layout (location = 2) in vec3 a_normal;

uniform mat4 model;
uniform mat4 view;
uniform mat4 projection;
uniform vec3 light_pos;

out vec3 normal_cameraspace;
out vec3 light_direction_cameraspace;
out vec3 eye_direction_cameraspace;
out vec3 position_worldspace;

void main() {
    vec3 vertex_cameraspace = (view * model * vec4(a_xyz, 1)).xyz;
    vec3 light_pos_cameraspace = (view * vec4(light_pos, 1)).xyz;

    normal_cameraspace = (transpose(inverse(view * model)) * vec4(a_normal, 0)).xyz;
    light_direction_cameraspace = light_pos_cameraspace + eye_direction_cameraspace;
    eye_direction_cameraspace = vec3(0, 0, 0) - vertex_cameraspace;
    position_worldspace = (model * vec4(a_xyz, 1)).xyz;

    gl_Position = projection * view * model * vec4(a_xyz, 1);
}