shader_type canvas_item;

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

uniform sampler2D screenTexture: hint_screen_texture, repeat_disable,  filter_linear_mipmap;

uniform sampler2D distortionTexture;
uniform float offsetR = 1;
uniform float offsetG = 1;
uniform float offsetB = 1;
uniform float maxScale: hint_range(1,2) = 1.25;
uniform float effectStrength: hint_range(0,1) = 1;
uniform sampler2D scrollingTexture;
uniform float scrollScale = 1;
uniform vec2 scrollDirection = vec2( 0.01,0.01 );
uniform float scrollAmount = 0.1;
uniform float minScroll = -1;
uniform float maxScroll = 1;

void fragment()
{
  vec2 scrollUV = mod( scrollScale * (UV + TIME * scrollDirection ), vec2(1,1) ) ;
  float strength = texture( distortionTexture, UV ).r + 
                  mix( minScroll, maxScroll, texture( scrollingTexture, scrollUV ).r ) * scrollAmount;
                  
                  
  vec2 outerUV  =  ( UV - vec2(0.5,0.5) ) * maxScale + vec2( 0.5, 0.5 );
  
  vec2 direction = ( UV - outerUV ) * effectStrength; 
  
  vec4 red    = texture( screenTexture, UV + strength * offsetR * direction );
  vec4 green  = texture( screenTexture, UV + strength * offsetG * direction );
  vec4 blue   = texture( screenTexture, UV + strength * offsetB * direction  );
  
  vec4 mixed = vec4( red.r, green.g, blue.b, 1 );
 
 
  COLOR = mixed;
}