/*
    Copyright (c) 2024 Josh Britain (jbritain)
    Licensed under the MIT license

      _____   __   _                          
     / ___/  / /  (_)  __ _   __ _  ___   ____
    / (_ /  / /  / /  /  ' \ /  ' \/ -_) / __/
    \___/  /_/  /_/  /_/_/_//_/_/_/\__/ /_/   
    
    By jbritain
    https://jbritain.net
                                            
*/

#include "/lib/common.glsl"

#ifdef vsh

out vec2 texcoord;

void main() {
  gl_Position = ftransform();
  texcoord = (gl_TextureMatrix[0] * gl_MultiTexCoord0).xy;
}

#endif

// ===========================================================================================

#ifdef fsh
in vec2 texcoord;

#include "/lib/dh.glsl"

/* RENDERTARGETS: 6 */
layout(location = 0) out float depth;

void main() {
  #if defined DISTANT_HORIZONS || defined VOXY
  depth = texture(depthtex0, texcoord).r;
  if (depth < 1.0) {
    depth = screenSpaceToViewSpace(depth);
    depth = viewSpaceToScreenSpace(depth, combinedProjection);
    return;
  }
  depth = texture(dhDepthTex0, texcoord).r;

  if (depth == 1.0) {
    return;
  }

  depth = screenSpaceToViewSpace(depth, dhProjectionInverse);
  depth = viewSpaceToScreenSpace(depth, combinedProjection);
  #endif
}

#endif