Shader Glitch Godot 4 (ColorRect)

Shader Glitch  Godot 4 (ColorRect)

shader_type canvas_item;

uniform sampler2D SCREEN_TEXTURE : hint_screen_texture, filter_linear_mipmap;
// 振動の強さ
uniform float shake_power = 0.03;
// 振動率
uniform float shake_rate : hint_range( 0.0, 1.0 ) = 0.2;
// 振動速度
uniform float shake_speed = 5.0;
// 振動ブロックサイズ
uniform float shake_block_size = 30.5;
// 色の分離率
uniform float shake_color_rate : hint_range( 0.0, 1.0 ) = 0.01;

float random( float seed )
{
    return fract( 543.2543 * sin( dot( vec2( seed, seed ), vec2( 3525.46, -54.3415 ) ) ) );
}

void fragment( )
{
    float enable_shift = float(
        random( trunc( TIME * shake_speed ) )
    <   shake_rate
    );

    vec2 fixed_uv = SCREEN_UV;
    fixed_uv.x += (
        random(
            ( trunc( SCREEN_UV.y * shake_block_size ) / shake_block_size )
        +   TIME
        ) - 0.5
    ) * shake_power * enable_shift;

    vec4 pixel_color = textureLod( SCREEN_TEXTURE, fixed_uv, 0.0 );
    pixel_color.r = mix(
        pixel_color.r
    ,   textureLod( SCREEN_TEXTURE, fixed_uv + vec2( shake_color_rate, 0.0 ), 0.0 ).r
    ,   enable_shift
    );
    pixel_color.b = mix(
        pixel_color.b
    ,   textureLod( SCREEN_TEXTURE, fixed_uv + vec2( -shake_color_rate, 0.0 ), 0.0 ).b
    ,   enable_shift
    );
    COLOR = pixel_color;
}