#version 300 es

in vec3 a_position;
uniform mat4 u_matrix;
uniform vec3 u_lightPos;

out vec4 pos;
out vec3 v_surfaceToLight;

void main() {
    pos = u_matrix * vec4(a_position, 1);
    gl_Position = pos;
    v_surfaceToLight = u_lightPos - pos.xyz;
}