#version 450
#extension GL_NV_compute_shader_derivatives : require

layout (local_size_x = 2, local_size_y = 4) in;

/*
 * GLSL_NV_compute_shader_derivatives says about derivative_group_quadsNV
 * and derivative_group_linearNV that:
 *   If neither layout qualifier is specified, derivatives in compute shaders
 *   return zero, which is consistent with the handling of built-in texture
 *   functions like texture() in GLSL 4.50 compute shaders.
 */

layout(set = 0, binding = 1) buffer block {
  float fDerivativeX;
  float fDerivativeY;
  
  float fX;
  float fY;
};

void main(){
    fDerivativeX = dFdx(fX);
    fDerivativeY = dFdy(fY);
}