/*
    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;
out vec4 glcolor;

void main() {
  // gl_Position = ;
  vec3 viewPos = (gl_ModelViewMatrix * gl_Vertex).xyz;
  viewPos = mix(viewPos, -sunPosition * sign(dot(-sunPosition, viewPos)), 0.7); // I am eternally grateful to builderb0y for this blindingly obvious solution
  gl_Position = gl_ProjectionMatrix * vec4(viewPos, 1.0);
  texcoord = (gl_TextureMatrix[0] * gl_MultiTexCoord0).xy;
  glcolor = gl_Color;
}

#endif

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

#ifdef fsh

in vec2 texcoord;
in vec4 glcolor;

/* RENDERTARGETS: 0 */
layout(location = 0) out vec4 color;

void main() {
  // remove bloom around moon by checking saturation since it's coloured while the moon is greyscale
  color = texture(gtexture, texcoord) * glcolor;
  vec3 color2 = hsv(color.rgb);

  if (color2.g > 0.5) {
    discard;
  }

  if (color.a < 0.01) {
    discard;
  }

  color.rgb *= vec3(2.0, 2.0, 3.0) * 0.3;
  color.rgb = pow(color.rgb, vec3(2.2));
}

#endif