civ14/Resources/Textures/Shaders/drunk.swsl

uniform sampler2D SCREEN_TEXTURE;
uniform highp float boozePower;
const highp float TimeScale = 0.5;
const highp float DistortionScale = 0.01;

void fragment() {

    highp float mod = mix(0.0, DistortionScale, boozePower);    
    highp vec2 coord = FRAGCOORD.xy * SCREEN_PIXEL_SIZE.xy;
    highp float time = TIME * TimeScale;

    highp vec2 offset = vec2((mod * 1.5) * sin(time * 1.5), (mod * 2.0) * cos(time * 1.5 - 0.2));
    highp vec4 tex1 = zTextureSpec(SCREEN_TEXTURE, coord + offset);
    
    if (boozePower > 0.5) {
        offset = vec2((mod * 2.0 - DistortionScale) * sin(time * 0.333 - 0.2), (mod * 2.0 - DistortionScale) * cos(time * 0.333));
        tex1 = mix(tex1, zTextureSpec(SCREEN_TEXTURE, coord + offset), mix(0.0, 0.3, boozePower*2.0-1.0));
    }
    
    offset = vec2((mod * 1.0) * sin(time * 1.0 + 0.1), (mod * 1.0) * cos(time * 1.0));
    COLOR = mix(tex1, zTextureSpec(SCREEN_TEXTURE, coord + offset), mix(0.0, 0.5, boozePower));
}