// NOTE: Shader automatically converted from Godot Engine 4.5.stable.mono's StandardMaterial3D.

shader_type spatial;
render_mode blend_mix, depth_draw_never, cull_disabled, diffuse_burley, specular_schlick_ggx, unshaded;

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

uniform vec4 albedo : source_color;
uniform sampler2D texture_albedo : source_color, filter_linear_mipmap_anisotropic, repeat_enable;
uniform float alpha_scissor_thresholdClose : hint_range(0.0, 1.0, 0.001);
uniform float alpha_scissor_thresholdFar : hint_range(0.0, 1.0, 0.001);
uniform float alpha_scissor_distance : hint_range(1.0, 100.0);
uniform ivec2 albedo_texture_size;
uniform float point_size : hint_range(0.1, 128.0, 0.1);

uniform float roughness : hint_range(0.0, 1.0);
uniform sampler2D texture_metallic : hint_default_white, filter_linear_mipmap_anisotropic, repeat_enable;
uniform vec4 metallic_texture_channel;
uniform sampler2D texture_roughness : hint_roughness_r, filter_linear_mipmap_anisotropic, repeat_enable;

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

uniform vec3 uv1_scale;
uniform vec3 uv1_offset;
uniform vec3 uv2_scale;
uniform vec3 uv2_offset;
varying float alphaTreshold;

global uniform float globalSnowAmount;
uniform float noiseScale = 1;
varying float noiseXZ;

void vertex() 
{
  vec3 worldVertex = localToWorld( VERTEX, MODEL_MATRIX );
  vec2 noisePosition = vec2( worldVertex.x, worldVertex.z );
  noiseXZ = mod( noisePosition.x * noiseScale, 1.0 ) ;
  
  float cameraDistance = length( localToWorld( VERTEX, MODEL_MATRIX ) - CAMERA_POSITION_WORLD );
  alphaTreshold = mapClamped( cameraDistance, 0, alpha_scissor_distance, alpha_scissor_thresholdClose, alpha_scissor_thresholdFar );
  
	UV = UV * uv1_scale.xy + uv1_offset.xy;

	// Billboard Mode: Enabled
	MODELVIEW_MATRIX = VIEW_MATRIX * mat4(
			MAIN_CAM_INV_VIEW_MATRIX[0],
			MAIN_CAM_INV_VIEW_MATRIX[1],
			MAIN_CAM_INV_VIEW_MATRIX[2],
			MODEL_MATRIX[3]);
      
      

	// Billboard Keep Scale: Enabled
	MODELVIEW_MATRIX = MODELVIEW_MATRIX * mat4(
			vec4(length(MODEL_MATRIX[0].xyz), 0.0, 0.0, 0.0),
			vec4(0.0, length(MODEL_MATRIX[1].xyz), 0.0, 0.0),
			vec4(0.0, 0.0, length(MODEL_MATRIX[2].xyz), 0.0),
			vec4(0.0, 0.0, 0.0, 1.0));
	MODELVIEW_NORMAL_MATRIX = mat3(MODELVIEW_MATRIX);
}

void fragment() 
{
	vec2 base_uv = UV; 

	vec4 albedo_tex = texture(texture_albedo, base_uv);

	// Vertex Color Use as Albedo: Enabled
	albedo_tex *= COLOR;

	ALBEDO = albedo.rgb * albedo_tex.rgb;
  // ALBEDO = mix( ALBEDO, vec3( 1, 0, 0 ), noiseXZ );

	float metallic_tex = dot(texture(texture_metallic, base_uv), metallic_texture_channel);
	METALLIC = metallic_tex * metallic;
	SPECULAR = specular;

	vec4 roughness_texture_channel = vec4(1.0, 0.0, 0.0, 0.0);
	float roughness_tex = dot(texture(texture_roughness, base_uv), roughness_texture_channel);
	ROUGHNESS = roughness_tex * roughness;
	ALPHA *= albedo.a * albedo_tex.a;

  float fullAmount = mapClamped( globalSnowAmount, 0.2, 0.6, 0.0, 1.0 );
  ALPHA *= mix( globalSnowAmount * noiseXZ * 2.0, 1.0, fullAmount ) ; 
	ALPHA_SCISSOR_THRESHOLD = alphaTreshold;
}