#version 330 core

layout(location = 0) in vec4 in_position;
layout(location = 1) in vec3 in_color;
layout(location = 2) in vec3 in_normal;

out vec3 position;
out vec3 color;
out vec3 normal;

uniform mat4 model;
uniform mat4 view;
uniform mat4 projection;

void main() {
  // pass the vertex color and normal information to the fragment shader
  // (without any modification)
  color = in_color;
  normal = in_normal;

  // determine what the vertex position will be after the model transformation
  // and pass that information to the fragment shader, for use in the
  // illumination calculations in our case the model transformation is the
  // identity matrix so this isn't actually necessary, but it's included here
  // for completeness. Note that the vectors needed for the lighting
  // calculations must be computed using the vertex locations *without*
  // perspective warp applied
  position = vec3(model * in_position);

  // apply the model, view, and projection transformations to the vertex
  // position value that will be sent to the clipper, rasterizer, ...
  gl_Position = (projection * view * model * in_position);
}