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

      _____   __   _                          
     / ___/  / /  (_)  __ _   __ _  ___   ____
    / (_ /  / /  / /  /  ' \ /  ' \/ -_) / __/
    \___/  /_/  /_/  /_/_/_//_/_/_/\__/ /_/   
    
    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;
flat out int materialID;
out vec3 viewPos;
out vec3 normal;

void main() {
  materialID = int(mc_Entity.x + 0.5);
  texcoord = (gl_TextureMatrix[0] * gl_MultiTexCoord0).xy;
  lmcoord = (gl_TextureMatrix[1] * gl_MultiTexCoord1).xy;
  glcolor = gl_Color;

  normal = gl_NormalMatrix * gl_Normal;

  viewPos = (gl_ModelViewMatrix * gl_Vertex).xyz;
  viewPos += normal * 1e-3; // z fighting fix

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

#endif

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

#ifdef fsh
#include "/lib/util/packing.glsl"

in vec2 lmcoord;
in vec2 texcoord;
in vec4 glcolor;
flat in int materialID;
in vec3 viewPos;
in vec3 normal;

/* RENDERTARGETS: 0,1 */
layout(location = 0) out vec4 color;
layout(location = 1) out vec4 outData1;

void main() {
  color = texture(gtexture, texcoord) * glcolor;
  if (color.a < alphaTestRef) {
    discard;
  }
  color.rgb = pow(color.rgb, vec3(2.2));

  color.rgb *= EMISSION_STRENGTH / 64.0;

  #ifdef REALLY_FUCKING_GLOWING
  color.rgb *= 2.0;
  #endif

  outData1.xy = encodeNormal(mat3(gbufferModelViewInverse) * normal);
  outData1.z = 0.0;
  outData1.a = clamp01(float(materialID - 1000) * rcp(255.0));
}

#endif