Screen Warping

This shader creates a “screen warping” effect. It adds dynamic distortions to the image, creating a trembling or wave-like effect that can be used to enhance the atmosphere and retro gaming effect, or to simulate unstable or damaged screens.

Parameters:

warp_intensity: Controls the intensity of the distortion. The higher the value, the more noticeable the wave or trembling effect on the screen will be.
time_scale: Regulates the speed and dynamics of the distortions. Higher values will result in faster oscillations.

Shader code

shader_type canvas_item;

uniform sampler2D SCREEN_TEXTURE : hint_screen_texture;
uniform float warp_intensity : hint_range(0.0, 0.1) = 0.03; 
uniform float time_scale : hint_range(0.1, 10.0) = 1.0;

void fragment() {
    vec2 uv = SCREEN_UV;
    
    float warp = sin(uv.y * 10.0 + TIME * time_scale) * warp_intensity;
    
    uv.x += warp * smoothstep(0.2, 0.5, abs(uv.x - 0.5));
    
    COLOR = texture(SCREEN_TEXTURE, uv);
}