shader_type spatial;
render_mode blend_mix, depth_draw_opaque, cull_disabled, diffuse_burley, specular_schlick_ggx, sss_mode_skin;

#include "res://addons/rokojori_action_library/Runtime/Shading/Library/Math.gdshaderinc"
#include "res://addons/rokojori_action_library/Runtime/Shading/Library/Light.gdshaderinc"

uniform vec4 albedo : source_color;
uniform sampler2D texture_albedo : source_color, filter_linear_mipmap, repeat_enable;

uniform float roughness : hint_range(0.0, 1.0);
uniform sampler2D texture_roughness : hint_roughness_r, filter_linear_mipmap, repeat_enable;

uniform float metallic : hint_range(0.0, 1.0, 0.01);
uniform sampler2D texture_metallic : hint_default_white, filter_linear_mipmap, repeat_enable;

uniform float specular : hint_range(0.0, 1.0, 0.01);

uniform vec3 uv1_scale;
uniform vec3 uv1_offset;

uniform float scatter:hint_range( 0.0, 1.0 ) = 0.5;
uniform float scatterBoost:hint_range( 0.0, 1.0 ) = 0.5;
uniform float scatterDepth:hint_range( 0.0, 1.0 ) = 0.5;
// [ FRESNEL ]
group_uniforms fresnel;
uniform float fresnelZOffset;
uniform float fresnelPowerAmount;
uniform float fresnelPostScale;
uniform float fresnelPostOffset;
uniform float fresnelColorAmount:hint_range( 0.0, 1.0 );
uniform vec3 fresnelColor:source_color;
uniform vec3 fresnelEmission:source_color;

uniform float fresnelRoughnessAmount:hint_range( 0.0, 1.0 );
uniform float fresnelRoughness;
void vertex() 
{
	UV = UV * uv1_scale.xy + uv1_offset.xy;
}

void fragment() 
{
  float fresnel = fresnelNormalizedFromViewAdvanced( NORMAL, fresnelPowerAmount, fresnelPostScale, fresnelPostScale, fresnelPostOffset );
  fresnel = clamp01( fresnel );

	vec4 albedo_tex = texture( texture_albedo, UV );
	ALBEDO = albedo.rgb * albedo_tex.rgb;
  ALBEDO = mix( ALBEDO, fresnelColor, fresnel * fresnelColorAmount ); 

  EMISSION = fresnel * fresnelEmission;

	float metallic_tex = texture( texture_metallic, UV ).b;
	METALLIC = metallic_tex * metallic;
	SPECULAR = specular;

	float roughness_tex = texture( texture_roughness, UV ).g;
	ROUGHNESS = roughness_tex * roughness;
  ROUGHNESS = mix( ROUGHNESS, fresnelRoughness, fresnel * fresnelRoughnessAmount );

  SSS_STRENGTH =  max( 0.00001, scatter * 2.0 );

	SSS_TRANSMITTANCE_COLOR = vec4( 1.0 );
	SSS_TRANSMITTANCE_DEPTH = max( 0.00001, scatterDepth * 8.0 );
	SSS_TRANSMITTANCE_BOOST =  max( 0.00001, scatterBoost * 4.0 );

}