/*
    Copyright (c) 2024 Josh Britain (jbritain)
    Licensed under a custom non-commercial license.
    See LICENSE for full terms.

     __   __ __   ______   __  __   ______   __           __   __ __   ______   ______   ______   __   __   ______   ______    
    /\ \ / //\ \ /\  ___\ /\ \/\ \ /\  __ \ /\ \         /\ \ / //\ \ /\  == \ /\  == \ /\  __ \ /\ "-.\ \ /\  ___\ /\  ___\   
    \ \ \'/ \ \ \\ \___  \\ \ \_\ \\ \  __ \\ \ \____    \ \ \'/ \ \ \\ \  __< \ \  __< \ \  __ \\ \ \-.  \\ \ \____\ \  __\   
     \ \__|  \ \_\\/\_____\\ \_____\\ \_\ \_\\ \_____\    \ \__|  \ \_\\ \_____\\ \_\ \_\\ \_\ \_\\ \_\\"\_\\ \_____\\ \_____\ 
      \/_/    \/_/ \/_____/ \/_____/ \/_/\/_/ \/_____/     \/_/    \/_/ \/_____/ \/_/ /_/ \/_/\/_/ \/_/ \/_/ \/_____/ \/_____/ 
 
 



    By jbritain
    https://jbritain.net

*/

#include "/lib/common.glsl"

#ifdef vsh

in vec2 mc_Entity;
in vec4 at_tangent;

out vec2 lmcoord;
out vec2 texcoord;
out vec4 glcolor;
out vec3 viewPos;

void main() {
  texcoord = (gl_TextureMatrix[0] * gl_MultiTexCoord0).xy;
  lmcoord = (gl_TextureMatrix[1] * gl_MultiTexCoord1).xy;
  glcolor = gl_Color;

  viewPos = (gl_ModelViewMatrix * gl_Vertex).xyz;
  vec3 feetPlayerPos = (gbufferModelViewInverse * vec4(viewPos, 1.0)).xyz;
  feetPlayerPos.xz += feetPlayerPos.y * 0.25;
  viewPos = (gbufferModelView * vec4(feetPlayerPos, 1.0)).xyz;

  gl_Position = gbufferProjection * vec4(viewPos, 1.0);
}

#endif

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

#ifdef fsh
in vec2 lmcoord;
in vec2 texcoord;
in vec4 glcolor;
in vec3 viewPos;

/* RENDERTARGETS: 0,5 */
layout(location = 0) out vec4 color;
layout(location = 1) out vec4 rainMask;

void main() {
  color = texture(gtexture, texcoord) * glcolor;

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

  if (color.r == color.g) {
    // snow
    rainMask = vec4(0.0);
    return;
  } else {
    color = vec4(0.0);
    rainMask = vec4(1.0);
  }

  rainMask = vec4(1.0);
}

#endif