#version 450 core
out gl_PerVertex { vec4 gl_Position; };

layout(std140, binding = 0) uniform PerFrame {
  mat4 uView;
  mat4 uProj;
  vec4 uLightDir; // unused here
};
layout(std140, binding = 1) uniform PerObject {
  mat4 uModel; // use this to scale the cube (e.g., 3.0)
};

layout(location = 0) in  vec3 aPos;
layout(location = 1) in  vec3 aNormal; // present, unused
layout(location = 2) in  vec2 aUV;     // present, unused

layout(location = 0) out vec3 vDir;    // explicit location for SSO

void main() {
  // Use uModel to scale your standard cube (e.g., 3.0) from CPU.
  vec3 pLocal = mat3(uModel) * aPos;

  // Rotation-only view (drop translation)
  mat3 R = mat3(uView);

   vDir = pLocal;

  // Glue the cube to the camera (no translation), push to far plane
  vec4 p = uProj * vec4(R * pLocal, 1.0);
  gl_Position = vec4(p.xy, 1.0, 1.0);
}