// GLSL version
#version 460

layout ( local_size_x = 16, local_size_y = 16 ) in;

layout ( rgba16f, set = 0, binding = 0 ) uniform image2D image;

void main() {
  ivec2 texelCoord = ivec2( gl_GlobalInvocationID.xy );
  ivec2 size = imageSize( image );

  if ( texelCoord.x < size.x && texelCoord.y < size.y ) {
    vec4 color = vec4( 0.0, 0.0, 0.0, 1.0 );

    if ( gl_LocalInvocationID.x != 0 && gl_LocalInvocationID.y != 0 ) {
      color.x = float(texelCoord.x)/(size.x);
      color.y = float(texelCoord.y)/(size.y);
    }

    imageStore(image, texelCoord, color);
  }
}