Shader de efeito slowmotion na tela ( embassado nos cantos e nítido no centro ) Godot 4+

//Shader de efeito slowmotion na tela ( embassado nos cantos e nítido no centro ) Godot 4+

shader_type canvas_item;

uniform sampler2D SCREEN_TEXTURE : hint_screen_texture, filter_linear_mipmap;

uniform float slow_intensity : hint_range(0.0, 1.0) = 0.0;
uniform int blur_samples : hint_range(4, 32) = 12;
uniform float blur_strength : hint_range(0.0, 0.02) = 0.008;
uniform float desaturation_amount : hint_range(0.0, 1.0) = 0.6;
uniform float vignette_strength : hint_range(0.0, 1.0) = 0.5;

void fragment() {
    vec2 center = vec2(0.5, 0.5);
    vec2 uv = SCREEN_UV;

    // Radial blur
    vec4 color = texture(SCREEN_TEXTURE, uv);
    vec2 to_center = uv - center;
    float total_weight = 1.0;

    for (int i = 1; i < blur_samples; i++) {
        float step_factor = float(i) / float(blur_samples);
        vec2 offset = to_center * step_factor * blur_strength * slow_intensity;
        vec4 sample_color = texture(SCREEN_TEXTURE, uv + offset);
        color += sample_color;
        total_weight += 1.0;
    }

    color /= total_weight;

    // Desaturation
    float luminance = dot(color.rgb, vec3(0.299, 0.587, 0.114));
    color.rgb = mix(vec3(luminance), color.rgb, 1.0 - desaturation_amount * slow_intensity);

    // Vignette
    float dist = length(to_center);
    float vignette = smoothstep(0.4, 0.8, dist);
    color.rgb *= 1.0 - vignette * vignette_strength * slow_intensity;

    COLOR = color;
}