uniform vec3 u_lightWorldPos;
uniform mat4 u_worldViewProjection;
uniform mat4 u_worldInverseTranspose;

attribute vec3 position;
attribute vec2 texcoord;
attribute vec3 normal;

varying float v_lighting;
varying vec2 v_texcoord;

void main() {
  v_texcoord = texcoord;
  
  float lighting = abs(dot(normal, normalize(u_lightWorldPos)));
  lighting = (clamp(lighting, 0.0, 1.0) * 0.66) + 0.33;
  v_lighting = lighting;

  gl_Position = u_worldViewProjection * vec4(position, 1.0);
}